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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pip-20.2.3.dist-info/WHEEL
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Wheel-Version: 1.0
Generator: bdist_wheel (0.35.1)
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[console_scripts]
pip = pip._internal.cli.main:main
pip3 = pip._internal.cli.main:main
pip3.8 = pip._internal.cli.main:main
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pip
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pip-20.2.3.dist-info/LICENSE.txt
|
Copyright (c) 2008-2019 The pip developers (see AUTHORS.txt file)
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pip-20.2.3.dist-info/INSTALLER
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pip
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pip-20.2.3.dist-info/METADATA
|
Metadata-Version: 2.1
Name: pip
Version: 20.2.3
Summary: The PyPA recommended tool for installing Python packages.
Home-page: https://pip.pypa.io/
Author: The pip developers
Author-email: distutils-sig@python.org
License: MIT
Project-URL: Documentation, https://pip.pypa.io
Project-URL: Source, https://github.com/pypa/pip
Project-URL: Changelog, https://pip.pypa.io/en/stable/news/
Keywords: distutils easy_install egg setuptools wheel virtualenv
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Topic :: Software Development :: Build Tools
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Requires-Python: >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*
pip - The Python Package Installer
==================================
.. image:: https://img.shields.io/pypi/v/pip.svg
:target: https://pypi.org/project/pip/
.. image:: https://readthedocs.org/projects/pip/badge/?version=latest
:target: https://pip.pypa.io/en/latest
pip is the `package installer`_ for Python. You can use pip to install packages from the `Python Package Index`_ and other indexes.
Please take a look at our documentation for how to install and use pip:
* `Installation`_
* `Usage`_
We release updates regularly, with a new version every 3 months. Find more details in our documentation:
* `Release notes`_
* `Release process`_
In 2020, we're working on improvements to the heart of pip. Please `learn more and take our survey`_ to help us do it right.
If you find bugs, need help, or want to talk to the developers, please use our mailing lists or chat rooms:
* `Issue tracking`_
* `Discourse channel`_
* `User IRC`_
If you want to get involved head over to GitHub to get the source code, look at our development documentation and feel free to jump on the developer mailing lists and chat rooms:
* `GitHub page`_
* `Development documentation`_
* `Development mailing list`_
* `Development IRC`_
Code of Conduct
---------------
Everyone interacting in the pip project's codebases, issue trackers, chat
rooms, and mailing lists is expected to follow the `PyPA Code of Conduct`_.
.. _package installer: https://packaging.python.org/guides/tool-recommendations/
.. _Python Package Index: https://pypi.org
.. _Installation: https://pip.pypa.io/en/stable/installing.html
.. _Usage: https://pip.pypa.io/en/stable/
.. _Release notes: https://pip.pypa.io/en/stable/news.html
.. _Release process: https://pip.pypa.io/en/latest/development/release-process/
.. _GitHub page: https://github.com/pypa/pip
.. _Development documentation: https://pip.pypa.io/en/latest/development
.. _learn more and take our survey: https://pyfound.blogspot.com/2020/03/new-pip-resolver-to-roll-out-this-year.html
.. _Issue tracking: https://github.com/pypa/pip/issues
.. _Discourse channel: https://discuss.python.org/c/packaging
.. _Development mailing list: https://mail.python.org/mailman3/lists/distutils-sig.python.org/
.. _User IRC: https://webchat.freenode.net/?channels=%23pypa
.. _Development IRC: https://webchat.freenode.net/?channels=%23pypa-dev
.. _PyPA Code of Conduct: https://www.pypa.io/en/latest/code-of-conduct/
| 0 |
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| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/toml-0.10.2.dist-info/LICENSE
|
The MIT License
Copyright 2013-2019 William Pearson
Copyright 2015-2016 Julien Enselme
Copyright 2016 Google Inc.
Copyright 2017 Samuel Vasko
Copyright 2017 Nate Prewitt
Copyright 2017 Jack Evans
Copyright 2019 Filippo Broggini
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/toml-0.10.2.dist-info/WHEEL
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Wheel-Version: 1.0
Generator: bdist_wheel (0.35.1)
Root-Is-Purelib: true
Tag: py2-none-any
Tag: py3-none-any
| 0 |
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toml
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/toml-0.10.2.dist-info/INSTALLER
|
pip
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/toml-0.10.2.dist-info/METADATA
|
Metadata-Version: 2.1
Name: toml
Version: 0.10.2
Summary: Python Library for Tom's Obvious, Minimal Language
Home-page: https://github.com/uiri/toml
Author: William Pearson
Author-email: uiri@xqz.ca
License: MIT
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Requires-Python: >=2.6, !=3.0.*, !=3.1.*, !=3.2.*
****
TOML
****
.. image:: https://img.shields.io/pypi/v/toml
:target: https://pypi.org/project/toml/
.. image:: https://travis-ci.org/uiri/toml.svg?branch=master
:target: https://travis-ci.org/uiri/toml
.. image:: https://img.shields.io/pypi/pyversions/toml.svg
:target: https://pypi.org/project/toml/
A Python library for parsing and creating `TOML <https://en.wikipedia.org/wiki/TOML>`_.
The module passes `the TOML test suite <https://github.com/BurntSushi/toml-test>`_.
See also:
* `The TOML Standard <https://github.com/toml-lang/toml>`_
* `The currently supported TOML specification <https://github.com/toml-lang/toml/blob/v0.5.0/README.md>`_
Installation
============
To install the latest release on `PyPI <https://pypi.org/project/toml/>`_,
simply run:
::
pip install toml
Or to install the latest development version, run:
::
git clone https://github.com/uiri/toml.git
cd toml
python setup.py install
Quick Tutorial
==============
*toml.loads* takes in a string containing standard TOML-formatted data and
returns a dictionary containing the parsed data.
.. code:: pycon
>>> import toml
>>> toml_string = """
... # This is a TOML document.
...
... title = "TOML Example"
...
... [owner]
... name = "Tom Preston-Werner"
... dob = 1979-05-27T07:32:00-08:00 # First class dates
...
... [database]
... server = "192.168.1.1"
... ports = [ 8001, 8001, 8002 ]
... connection_max = 5000
... enabled = true
...
... [servers]
...
... # Indentation (tabs and/or spaces) is allowed but not required
... [servers.alpha]
... ip = "10.0.0.1"
... dc = "eqdc10"
...
... [servers.beta]
... ip = "10.0.0.2"
... dc = "eqdc10"
...
... [clients]
... data = [ ["gamma", "delta"], [1, 2] ]
...
... # Line breaks are OK when inside arrays
... hosts = [
... "alpha",
... "omega"
... ]
... """
>>> parsed_toml = toml.loads(toml_string)
*toml.dumps* takes a dictionary and returns a string containing the
corresponding TOML-formatted data.
.. code:: pycon
>>> new_toml_string = toml.dumps(parsed_toml)
>>> print(new_toml_string)
title = "TOML Example"
[owner]
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00Z
[database]
server = "192.168.1.1"
ports = [ 8001, 8001, 8002,]
connection_max = 5000
enabled = true
[clients]
data = [ [ "gamma", "delta",], [ 1, 2,],]
hosts = [ "alpha", "omega",]
[servers.alpha]
ip = "10.0.0.1"
dc = "eqdc10"
[servers.beta]
ip = "10.0.0.2"
dc = "eqdc10"
*toml.dump* takes a dictionary and a file descriptor and returns a string containing the
corresponding TOML-formatted data.
.. code:: pycon
>>> with open('new_toml_file.toml', 'w') as f:
... new_toml_string = toml.dump(parsed_toml, f)
>>> print(new_toml_string)
title = "TOML Example"
[owner]
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00Z
[database]
server = "192.168.1.1"
ports = [ 8001, 8001, 8002,]
connection_max = 5000
enabled = true
[clients]
data = [ [ "gamma", "delta",], [ 1, 2,],]
hosts = [ "alpha", "omega",]
[servers.alpha]
ip = "10.0.0.1"
dc = "eqdc10"
[servers.beta]
ip = "10.0.0.2"
dc = "eqdc10"
For more functions, view the API Reference below.
Note
----
For Numpy users, by default the data types ``np.floatX`` will not be translated to floats by toml, but will instead be encoded as strings. To get around this, specify the ``TomlNumpyEncoder`` when saving your data.
.. code:: pycon
>>> import toml
>>> import numpy as np
>>> a = np.arange(0, 10, dtype=np.double)
>>> output = {'a': a}
>>> toml.dumps(output)
'a = [ "0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "6.0", "7.0", "8.0", "9.0",]\n'
>>> toml.dumps(output, encoder=toml.TomlNumpyEncoder())
'a = [ 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0,]\n'
API Reference
=============
``toml.load(f, _dict=dict)``
Parse a file or a list of files as TOML and return a dictionary.
:Args:
* ``f``: A path to a file, list of filepaths (to be read into single
object) or a file descriptor
* ``_dict``: The class of the dictionary object to be returned
:Returns:
A dictionary (or object ``_dict``) containing parsed TOML data
:Raises:
* ``TypeError``: When ``f`` is an invalid type or is a list containing
invalid types
* ``TomlDecodeError``: When an error occurs while decoding the file(s)
``toml.loads(s, _dict=dict)``
Parse a TOML-formatted string to a dictionary.
:Args:
* ``s``: The TOML-formatted string to be parsed
* ``_dict``: Specifies the class of the returned toml dictionary
:Returns:
A dictionary (or object ``_dict``) containing parsed TOML data
:Raises:
* ``TypeError``: When a non-string object is passed
* ``TomlDecodeError``: When an error occurs while decoding the
TOML-formatted string
``toml.dump(o, f, encoder=None)``
Write a dictionary to a file containing TOML-formatted data
:Args:
* ``o``: An object to be converted into TOML
* ``f``: A File descriptor where the TOML-formatted output should be stored
* ``encoder``: An instance of ``TomlEncoder`` (or subclass) for encoding the object. If ``None``, will default to ``TomlEncoder``
:Returns:
A string containing the TOML-formatted data corresponding to object ``o``
:Raises:
* ``TypeError``: When anything other than file descriptor is passed
``toml.dumps(o, encoder=None)``
Create a TOML-formatted string from an input object
:Args:
* ``o``: An object to be converted into TOML
* ``encoder``: An instance of ``TomlEncoder`` (or subclass) for encoding the object. If ``None``, will default to ``TomlEncoder``
:Returns:
A string containing the TOML-formatted data corresponding to object ``o``
Licensing
=========
This project is released under the terms of the MIT Open Source License. View
*LICENSE.txt* for more information.
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jinja2/parser.py,sha256=fcfdqePNTNyvosIvczbytVA332qpsURvYnCGcjDHSkA,35660
jinja2/runtime.py,sha256=0y-BRyIEZ9ltByL2Id6GpHe1oDRQAwNeQvI0SKobNMw,30618
jinja2/sandbox.py,sha256=knayyUvXsZ-F0mk15mO2-ehK9gsw04UhB8td-iUOtLc,17127
jinja2/tests.py,sha256=iO_Y-9Vo60zrVe1lMpSl5sKHqAxe2leZHC08OoZ8K24,4799
jinja2/utils.py,sha256=OoVMlQe9S2-lWT6jJbTu9tDuDvGNyWUhHDcE51i5_Do,22522
jinja2/visitor.py,sha256=DUHupl0a4PGp7nxRtZFttUzAi1ccxzqc2hzetPYUz8U,3240
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/Jinja2-2.11.2.dist-info/WHEEL
|
Wheel-Version: 1.0
Generator: bdist_wheel (0.34.2)
Root-Is-Purelib: true
Tag: py2-none-any
Tag: py3-none-any
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/Jinja2-2.11.2.dist-info/entry_points.txt
|
[babel.extractors]
jinja2 = jinja2.ext:babel_extract [i18n]
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/Jinja2-2.11.2.dist-info/LICENSE.rst
|
Copyright 2007 Pallets
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/Jinja2-2.11.2.dist-info/top_level.txt
|
jinja2
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/Jinja2-2.11.2.dist-info/INSTALLER
|
pip
| 0 |
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/Jinja2-2.11.2.dist-info/METADATA
|
Metadata-Version: 2.1
Name: Jinja2
Version: 2.11.2
Summary: A very fast and expressive template engine.
Home-page: https://palletsprojects.com/p/jinja/
Author: Armin Ronacher
Author-email: armin.ronacher@active-4.com
Maintainer: Pallets
Maintainer-email: contact@palletsprojects.com
License: BSD-3-Clause
Project-URL: Documentation, https://jinja.palletsprojects.com/
Project-URL: Code, https://github.com/pallets/jinja
Project-URL: Issue tracker, https://github.com/pallets/jinja/issues
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Web Environment
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Text Processing :: Markup :: HTML
Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
Description-Content-Type: text/x-rst
Requires-Dist: MarkupSafe (>=0.23)
Provides-Extra: i18n
Requires-Dist: Babel (>=0.8) ; extra == 'i18n'
Jinja
=====
Jinja is a fast, expressive, extensible templating engine. Special
placeholders in the template allow writing code similar to Python
syntax. Then the template is passed data to render the final document.
It includes:
- Template inheritance and inclusion.
- Define and import macros within templates.
- HTML templates can use autoescaping to prevent XSS from untrusted
user input.
- A sandboxed environment can safely render untrusted templates.
- AsyncIO support for generating templates and calling async
functions.
- I18N support with Babel.
- Templates are compiled to optimized Python code just-in-time and
cached, or can be compiled ahead-of-time.
- Exceptions point to the correct line in templates to make debugging
easier.
- Extensible filters, tests, functions, and even syntax.
Jinja's philosophy is that while application logic belongs in Python if
possible, it shouldn't make the template designer's job difficult by
restricting functionality too much.
Installing
----------
Install and update using `pip`_:
.. code-block:: text
$ pip install -U Jinja2
.. _pip: https://pip.pypa.io/en/stable/quickstart/
In A Nutshell
-------------
.. code-block:: jinja
{% extends "base.html" %}
{% block title %}Members{% endblock %}
{% block content %}
<ul>
{% for user in users %}
<li><a href="{{ user.url }}">{{ user.username }}</a></li>
{% endfor %}
</ul>
{% endblock %}
Links
-----
- Website: https://palletsprojects.com/p/jinja/
- Documentation: https://jinja.palletsprojects.com/
- Releases: https://pypi.org/project/Jinja2/
- Code: https://github.com/pallets/jinja
- Issue tracker: https://github.com/pallets/jinja/issues
- Test status: https://dev.azure.com/pallets/jinja/_build
- Official chat: https://discord.gg/t6rrQZH
| 0 |
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/six-1.15.0.dist-info/RECORD
|
__pycache__/six.cpython-39.pyc,,
six-1.15.0.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4
six-1.15.0.dist-info/LICENSE,sha256=i7hQxWWqOJ_cFvOkaWWtI9gq3_YPI5P8J2K2MYXo5sk,1066
six-1.15.0.dist-info/METADATA,sha256=W6rlyoeMZHXh6srP9NXNsm0rjAf_660re8WdH5TBT8E,1795
six-1.15.0.dist-info/RECORD,,
six-1.15.0.dist-info/REQUESTED,sha256=47DEQpj8HBSa-_TImW-5JCeuQeRkm5NMpJWZG3hSuFU,0
six-1.15.0.dist-info/WHEEL,sha256=kGT74LWyRUZrL4VgLh6_g12IeVl_9u9ZVhadrgXZUEY,110
six-1.15.0.dist-info/top_level.txt,sha256=_iVH_iYEtEXnD8nYGQYpYFUvkUW9sEO1GYbkeKSAais,4
six.py,sha256=U4Z_yv534W5CNyjY9i8V1OXY2SjAny8y2L5vDLhhThM,34159
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/six-1.15.0.dist-info/LICENSE
|
Copyright (c) 2010-2020 Benjamin Peterson
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/six-1.15.0.dist-info/WHEEL
|
Wheel-Version: 1.0
Generator: bdist_wheel (0.34.2)
Root-Is-Purelib: true
Tag: py2-none-any
Tag: py3-none-any
| 0 |
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/six-1.15.0.dist-info/top_level.txt
|
six
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/six-1.15.0.dist-info/INSTALLER
|
pip
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/six-1.15.0.dist-info/METADATA
|
Metadata-Version: 2.1
Name: six
Version: 1.15.0
Summary: Python 2 and 3 compatibility utilities
Home-page: https://github.com/benjaminp/six
Author: Benjamin Peterson
Author-email: benjamin@python.org
License: MIT
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: Utilities
Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*
.. image:: https://img.shields.io/pypi/v/six.svg
:target: https://pypi.org/project/six/
:alt: six on PyPI
.. image:: https://travis-ci.org/benjaminp/six.svg?branch=master
:target: https://travis-ci.org/benjaminp/six
:alt: six on TravisCI
.. image:: https://readthedocs.org/projects/six/badge/?version=latest
:target: https://six.readthedocs.io/
:alt: six's documentation on Read the Docs
.. image:: https://img.shields.io/badge/license-MIT-green.svg
:target: https://github.com/benjaminp/six/blob/master/LICENSE
:alt: MIT License badge
Six is a Python 2 and 3 compatibility library. It provides utility functions
for smoothing over the differences between the Python versions with the goal of
writing Python code that is compatible on both Python versions. See the
documentation for more information on what is provided.
Six supports Python 2.7 and 3.3+. It is contained in only one Python
file, so it can be easily copied into your project. (The copyright and license
notice must be retained.)
Online documentation is at https://six.readthedocs.io/.
Bugs can be reported to https://github.com/benjaminp/six. The code can also
be found there.
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/flask_cors/version.py
|
__version__ = '3.0.10'
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/flask_cors/decorator.py
|
# -*- coding: utf-8 -*-
"""
decorator
~~~~
This unit exposes a single decorator which should be used to wrap a
Flask route with. It accepts all parameters and options as
the CORS extension.
:copyright: (c) 2016 by Cory Dolphin.
:license: MIT, see LICENSE for more details.
"""
from functools import update_wrapper
from flask import make_response, request, current_app
from .core import *
LOG = logging.getLogger(__name__)
def cross_origin(*args, **kwargs):
"""
This function is the decorator which is used to wrap a Flask route with.
In the simplest case, simply use the default parameters to allow all
origins in what is the most permissive configuration. If this method
modifies state or performs authentication which may be brute-forced, you
should add some degree of protection, such as Cross Site Forgery
Request protection.
:param origins:
The origin, or list of origins to allow requests from.
The origin(s) may be regular expressions, case-sensitive strings,
or else an asterisk
Default : '*'
:type origins: list, string or regex
:param methods:
The method or list of methods which the allowed origins are allowed to
access for non-simple requests.
Default : [GET, HEAD, POST, OPTIONS, PUT, PATCH, DELETE]
:type methods: list or string
:param expose_headers:
The header or list which are safe to expose to the API of a CORS API
specification.
Default : None
:type expose_headers: list or string
:param allow_headers:
The header or list of header field names which can be used when this
resource is accessed by allowed origins. The header(s) may be regular
expressions, case-sensitive strings, or else an asterisk.
Default : '*', allow all headers
:type allow_headers: list, string or regex
:param supports_credentials:
Allows users to make authenticated requests. If true, injects the
`Access-Control-Allow-Credentials` header in responses. This allows
cookies and credentials to be submitted across domains.
:note: This option cannot be used in conjuction with a '*' origin
Default : False
:type supports_credentials: bool
:param max_age:
The maximum time for which this CORS request maybe cached. This value
is set as the `Access-Control-Max-Age` header.
Default : None
:type max_age: timedelta, integer, string or None
:param send_wildcard: If True, and the origins parameter is `*`, a wildcard
`Access-Control-Allow-Origin` header is sent, rather than the
request's `Origin` header.
Default : False
:type send_wildcard: bool
:param vary_header:
If True, the header Vary: Origin will be returned as per the W3
implementation guidelines.
Setting this header when the `Access-Control-Allow-Origin` is
dynamically generated (e.g. when there is more than one allowed
origin, and an Origin than '*' is returned) informs CDNs and other
caches that the CORS headers are dynamic, and cannot be cached.
If False, the Vary header will never be injected or altered.
Default : True
:type vary_header: bool
:param automatic_options:
Only applies to the `cross_origin` decorator. If True, Flask-CORS will
override Flask's default OPTIONS handling to return CORS headers for
OPTIONS requests.
Default : True
:type automatic_options: bool
"""
_options = kwargs
def decorator(f):
LOG.debug("Enabling %s for cross_origin using options:%s", f, _options)
# If True, intercept OPTIONS requests by modifying the view function,
# replicating Flask's default behavior, and wrapping the response with
# CORS headers.
#
# If f.provide_automatic_options is unset or True, Flask's route
# decorator (which is actually wraps the function object we return)
# intercepts OPTIONS handling, and requests will not have CORS headers
if _options.get('automatic_options', True):
f.required_methods = getattr(f, 'required_methods', set())
f.required_methods.add('OPTIONS')
f.provide_automatic_options = False
def wrapped_function(*args, **kwargs):
# Handle setting of Flask-Cors parameters
options = get_cors_options(current_app, _options)
if options.get('automatic_options') and request.method == 'OPTIONS':
resp = current_app.make_default_options_response()
else:
resp = make_response(f(*args, **kwargs))
set_cors_headers(resp, options)
setattr(resp, FLASK_CORS_EVALUATED, True)
return resp
return update_wrapper(wrapped_function, f)
return decorator
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/flask_cors/__init__.py
|
# -*- coding: utf-8 -*-
"""
flask_cors
~~~~
Flask-CORS is a simple extension to Flask allowing you to support cross
origin resource sharing (CORS) using a simple decorator.
:copyright: (c) 2016 by Cory Dolphin.
:license: MIT, see LICENSE for more details.
"""
from .decorator import cross_origin
from .extension import CORS
from .version import __version__
__all__ = ['CORS', 'cross_origin']
# Set default logging handler to avoid "No handler found" warnings.
import logging
from logging import NullHandler
# Set initial level to WARN. Users must manually enable logging for
# flask_cors to see our logging.
rootlogger = logging.getLogger(__name__)
rootlogger.addHandler(NullHandler())
if rootlogger.level == logging.NOTSET:
rootlogger.setLevel(logging.WARN)
| 0 |
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/flask_cors/core.py
|
# -*- coding: utf-8 -*-
"""
core
~~~~
Core functionality shared between the extension and the decorator.
:copyright: (c) 2016 by Cory Dolphin.
:license: MIT, see LICENSE for more details.
"""
import re
import logging
try:
# on python 3
from collections.abc import Iterable
except ImportError:
# on python 2.7 and pypy
from collections import Iterable
from datetime import timedelta
from six import string_types
from flask import request, current_app
from werkzeug.datastructures import Headers, MultiDict
LOG = logging.getLogger(__name__)
# Response Headers
ACL_ORIGIN = 'Access-Control-Allow-Origin'
ACL_METHODS = 'Access-Control-Allow-Methods'
ACL_ALLOW_HEADERS = 'Access-Control-Allow-Headers'
ACL_EXPOSE_HEADERS = 'Access-Control-Expose-Headers'
ACL_CREDENTIALS = 'Access-Control-Allow-Credentials'
ACL_MAX_AGE = 'Access-Control-Max-Age'
# Request Header
ACL_REQUEST_METHOD = 'Access-Control-Request-Method'
ACL_REQUEST_HEADERS = 'Access-Control-Request-Headers'
ALL_METHODS = ['GET', 'HEAD', 'POST', 'OPTIONS', 'PUT', 'PATCH', 'DELETE']
CONFIG_OPTIONS = ['CORS_ORIGINS', 'CORS_METHODS', 'CORS_ALLOW_HEADERS',
'CORS_EXPOSE_HEADERS', 'CORS_SUPPORTS_CREDENTIALS',
'CORS_MAX_AGE', 'CORS_SEND_WILDCARD',
'CORS_AUTOMATIC_OPTIONS', 'CORS_VARY_HEADER',
'CORS_RESOURCES', 'CORS_INTERCEPT_EXCEPTIONS',
'CORS_ALWAYS_SEND']
# Attribute added to request object by decorator to indicate that CORS
# was evaluated, in case the decorator and extension are both applied
# to a view.
FLASK_CORS_EVALUATED = '_FLASK_CORS_EVALUATED'
# Strange, but this gets the type of a compiled regex, which is otherwise not
# exposed in a public API.
RegexObject = type(re.compile(''))
DEFAULT_OPTIONS = dict(origins='*',
methods=ALL_METHODS,
allow_headers='*',
expose_headers=None,
supports_credentials=False,
max_age=None,
send_wildcard=False,
automatic_options=True,
vary_header=True,
resources=r'/*',
intercept_exceptions=True,
always_send=True)
def parse_resources(resources):
if isinstance(resources, dict):
# To make the API more consistent with the decorator, allow a
# resource of '*', which is not actually a valid regexp.
resources = [(re_fix(k), v) for k, v in resources.items()]
# Sort by regex length to provide consistency of matching and
# to provide a proxy for specificity of match. E.G. longer
# regular expressions are tried first.
def pattern_length(pair):
maybe_regex, _ = pair
return len(get_regexp_pattern(maybe_regex))
return sorted(resources,
key=pattern_length,
reverse=True)
elif isinstance(resources, string_types):
return [(re_fix(resources), {})]
elif isinstance(resources, Iterable):
return [(re_fix(r), {}) for r in resources]
# Type of compiled regex is not part of the public API. Test for this
# at runtime.
elif isinstance(resources, RegexObject):
return [(re_fix(resources), {})]
else:
raise ValueError("Unexpected value for resources argument.")
def get_regexp_pattern(regexp):
"""
Helper that returns regexp pattern from given value.
:param regexp: regular expression to stringify
:type regexp: _sre.SRE_Pattern or str
:returns: string representation of given regexp pattern
:rtype: str
"""
try:
return regexp.pattern
except AttributeError:
return str(regexp)
def get_cors_origins(options, request_origin):
origins = options.get('origins')
wildcard = r'.*' in origins
# If the Origin header is not present terminate this set of steps.
# The request is outside the scope of this specification.-- W3Spec
if request_origin:
LOG.debug("CORS request received with 'Origin' %s", request_origin)
# If the allowed origins is an asterisk or 'wildcard', always match
if wildcard and options.get('send_wildcard'):
LOG.debug("Allowed origins are set to '*'. Sending wildcard CORS header.")
return ['*']
# If the value of the Origin header is a case-sensitive match
# for any of the values in list of origins
elif try_match_any(request_origin, origins):
LOG.debug("The request's Origin header matches. Sending CORS headers.", )
# Add a single Access-Control-Allow-Origin header, with either
# the value of the Origin header or the string "*" as value.
# -- W3Spec
return [request_origin]
else:
LOG.debug("The request's Origin header does not match any of allowed origins.")
return None
elif options.get('always_send'):
if wildcard:
# If wildcard is in the origins, even if 'send_wildcard' is False,
# simply send the wildcard. Unless supports_credentials is True,
# since that is forbidded by the spec..
# It is the most-likely to be correct thing to do (the only other
# option is to return nothing, which almost certainly not what
# the developer wants if the '*' origin was specified.
if options.get('supports_credentials'):
return None
else:
return ['*']
else:
# Return all origins that are not regexes.
return sorted([o for o in origins if not probably_regex(o)])
# Terminate these steps, return the original request untouched.
else:
LOG.debug("The request did not contain an 'Origin' header. This means the browser or client did not request CORS, ensure the Origin Header is set.")
return None
def get_allow_headers(options, acl_request_headers):
if acl_request_headers:
request_headers = [h.strip() for h in acl_request_headers.split(',')]
# any header that matches in the allow_headers
matching_headers = filter(
lambda h: try_match_any(h, options.get('allow_headers')),
request_headers
)
return ', '.join(sorted(matching_headers))
return None
def get_cors_headers(options, request_headers, request_method):
origins_to_set = get_cors_origins(options, request_headers.get('Origin'))
headers = MultiDict()
if not origins_to_set: # CORS is not enabled for this route
return headers
for origin in origins_to_set:
headers.add(ACL_ORIGIN, origin)
headers[ACL_EXPOSE_HEADERS] = options.get('expose_headers')
if options.get('supports_credentials'):
headers[ACL_CREDENTIALS] = 'true' # case sensative
# This is a preflight request
# http://www.w3.org/TR/cors/#resource-preflight-requests
if request_method == 'OPTIONS':
acl_request_method = request_headers.get(ACL_REQUEST_METHOD, '').upper()
# If there is no Access-Control-Request-Method header or if parsing
# failed, do not set any additional headers
if acl_request_method and acl_request_method in options.get('methods'):
# If method is not a case-sensitive match for any of the values in
# list of methods do not set any additional headers and terminate
# this set of steps.
headers[ACL_ALLOW_HEADERS] = get_allow_headers(options, request_headers.get(ACL_REQUEST_HEADERS))
headers[ACL_MAX_AGE] = options.get('max_age')
headers[ACL_METHODS] = options.get('methods')
else:
LOG.info("The request's Access-Control-Request-Method header does not match allowed methods. CORS headers will not be applied.")
# http://www.w3.org/TR/cors/#resource-implementation
if options.get('vary_header'):
# Only set header if the origin returned will vary dynamically,
# i.e. if we are not returning an asterisk, and there are multiple
# origins that can be matched.
if headers[ACL_ORIGIN] == '*':
pass
elif (len(options.get('origins')) > 1 or
len(origins_to_set) > 1 or
any(map(probably_regex, options.get('origins')))):
headers.add('Vary', 'Origin')
return MultiDict((k, v) for k, v in headers.items() if v)
def set_cors_headers(resp, options):
"""
Performs the actual evaluation of Flas-CORS options and actually
modifies the response object.
This function is used both in the decorator and the after_request
callback
"""
# If CORS has already been evaluated via the decorator, skip
if hasattr(resp, FLASK_CORS_EVALUATED):
LOG.debug('CORS have been already evaluated, skipping')
return resp
# Some libraries, like OAuthlib, set resp.headers to non Multidict
# objects (Werkzeug Headers work as well). This is a problem because
# headers allow repeated values.
if (not isinstance(resp.headers, Headers)
and not isinstance(resp.headers, MultiDict)):
resp.headers = MultiDict(resp.headers)
headers_to_set = get_cors_headers(options, request.headers, request.method)
LOG.debug('Settings CORS headers: %s', str(headers_to_set))
for k, v in headers_to_set.items():
resp.headers.add(k, v)
return resp
def probably_regex(maybe_regex):
if isinstance(maybe_regex, RegexObject):
return True
else:
common_regex_chars = ['*', '\\', ']', '?', '$', '^', '[', ']', '(', ')']
# Use common characters used in regular expressions as a proxy
# for if this string is in fact a regex.
return any((c in maybe_regex for c in common_regex_chars))
def re_fix(reg):
"""
Replace the invalid regex r'*' with the valid, wildcard regex r'/.*' to
enable the CORS app extension to have a more user friendly api.
"""
return r'.*' if reg == r'*' else reg
def try_match_any(inst, patterns):
return any(try_match(inst, pattern) for pattern in patterns)
def try_match(request_origin, maybe_regex):
"""Safely attempts to match a pattern or string to a request origin."""
if isinstance(maybe_regex, RegexObject):
return re.match(maybe_regex, request_origin)
elif probably_regex(maybe_regex):
return re.match(maybe_regex, request_origin, flags=re.IGNORECASE)
else:
try:
return request_origin.lower() == maybe_regex.lower()
except AttributeError:
return request_origin == maybe_regex
def get_cors_options(appInstance, *dicts):
"""
Compute CORS options for an application by combining the DEFAULT_OPTIONS,
the app's configuration-specified options and any dictionaries passed. The
last specified option wins.
"""
options = DEFAULT_OPTIONS.copy()
options.update(get_app_kwarg_dict(appInstance))
if dicts:
for d in dicts:
options.update(d)
return serialize_options(options)
def get_app_kwarg_dict(appInstance=None):
"""Returns the dictionary of CORS specific app configurations."""
app = (appInstance or current_app)
# In order to support blueprints which do not have a config attribute
app_config = getattr(app, 'config', {})
return {
k.lower().replace('cors_', ''): app_config.get(k)
for k in CONFIG_OPTIONS
if app_config.get(k) is not None
}
def flexible_str(obj):
"""
A more flexible str function which intelligently handles stringifying
strings, lists and other iterables. The results are lexographically sorted
to ensure generated responses are consistent when iterables such as Set
are used.
"""
if obj is None:
return None
elif(not isinstance(obj, string_types)
and isinstance(obj, Iterable)):
return ', '.join(str(item) for item in sorted(obj))
else:
return str(obj)
def serialize_option(options_dict, key, upper=False):
if key in options_dict:
value = flexible_str(options_dict[key])
options_dict[key] = value.upper() if upper else value
def ensure_iterable(inst):
"""
Wraps scalars or string types as a list, or returns the iterable instance.
"""
if isinstance(inst, string_types):
return [inst]
elif not isinstance(inst, Iterable):
return [inst]
else:
return inst
def sanitize_regex_param(param):
return [re_fix(x) for x in ensure_iterable(param)]
def serialize_options(opts):
"""
A helper method to serialize and processes the options dictionary.
"""
options = (opts or {}).copy()
for key in opts.keys():
if key not in DEFAULT_OPTIONS:
LOG.warning("Unknown option passed to Flask-CORS: %s", key)
# Ensure origins is a list of allowed origins with at least one entry.
options['origins'] = sanitize_regex_param(options.get('origins'))
options['allow_headers'] = sanitize_regex_param(options.get('allow_headers'))
# This is expressly forbidden by the spec. Raise a value error so people
# don't get burned in production.
if r'.*' in options['origins'] and options['supports_credentials'] and options['send_wildcard']:
raise ValueError("Cannot use supports_credentials in conjunction with"
"an origin string of '*'. See: "
"http://www.w3.org/TR/cors/#resource-requests")
serialize_option(options, 'expose_headers')
serialize_option(options, 'methods', upper=True)
if isinstance(options.get('max_age'), timedelta):
options['max_age'] = str(int(options['max_age'].total_seconds()))
return options
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/flask_cors/extension.py
|
# -*- coding: utf-8 -*-
"""
extension
~~~~
Flask-CORS is a simple extension to Flask allowing you to support cross
origin resource sharing (CORS) using a simple decorator.
:copyright: (c) 2016 by Cory Dolphin.
:license: MIT, see LICENSE for more details.
"""
from flask import request
from .core import *
try:
from urllib.parse import unquote_plus
except ImportError:
from urllib import unquote_plus
LOG = logging.getLogger(__name__)
class CORS(object):
"""
Initializes Cross Origin Resource sharing for the application. The
arguments are identical to :py:func:`cross_origin`, with the addition of a
`resources` parameter. The resources parameter defines a series of regular
expressions for resource paths to match and optionally, the associated
options to be applied to the particular resource. These options are
identical to the arguments to :py:func:`cross_origin`.
The settings for CORS are determined in the following order
1. Resource level settings (e.g when passed as a dictionary)
2. Keyword argument settings
3. App level configuration settings (e.g. CORS_*)
4. Default settings
Note: as it is possible for multiple regular expressions to match a
resource path, the regular expressions are first sorted by length,
from longest to shortest, in order to attempt to match the most
specific regular expression. This allows the definition of a
number of specific resource options, with a wildcard fallback
for all other resources.
:param resources:
The series of regular expression and (optionally) associated CORS
options to be applied to the given resource path.
If the argument is a dictionary, it's keys must be regular expressions,
and the values must be a dictionary of kwargs, identical to the kwargs
of this function.
If the argument is a list, it is expected to be a list of regular
expressions, for which the app-wide configured options are applied.
If the argument is a string, it is expected to be a regular expression
for which the app-wide configured options are applied.
Default : Match all and apply app-level configuration
:type resources: dict, iterable or string
:param origins:
The origin, or list of origins to allow requests from.
The origin(s) may be regular expressions, case-sensitive strings,
or else an asterisk
Default : '*'
:type origins: list, string or regex
:param methods:
The method or list of methods which the allowed origins are allowed to
access for non-simple requests.
Default : [GET, HEAD, POST, OPTIONS, PUT, PATCH, DELETE]
:type methods: list or string
:param expose_headers:
The header or list which are safe to expose to the API of a CORS API
specification.
Default : None
:type expose_headers: list or string
:param allow_headers:
The header or list of header field names which can be used when this
resource is accessed by allowed origins. The header(s) may be regular
expressions, case-sensitive strings, or else an asterisk.
Default : '*', allow all headers
:type allow_headers: list, string or regex
:param supports_credentials:
Allows users to make authenticated requests. If true, injects the
`Access-Control-Allow-Credentials` header in responses. This allows
cookies and credentials to be submitted across domains.
:note: This option cannot be used in conjunction with a '*' origin
Default : False
:type supports_credentials: bool
:param max_age:
The maximum time for which this CORS request maybe cached. This value
is set as the `Access-Control-Max-Age` header.
Default : None
:type max_age: timedelta, integer, string or None
:param send_wildcard: If True, and the origins parameter is `*`, a wildcard
`Access-Control-Allow-Origin` header is sent, rather than the
request's `Origin` header.
Default : False
:type send_wildcard: bool
:param vary_header:
If True, the header Vary: Origin will be returned as per the W3
implementation guidelines.
Setting this header when the `Access-Control-Allow-Origin` is
dynamically generated (e.g. when there is more than one allowed
origin, and an Origin than '*' is returned) informs CDNs and other
caches that the CORS headers are dynamic, and cannot be cached.
If False, the Vary header will never be injected or altered.
Default : True
:type vary_header: bool
"""
def __init__(self, app=None, **kwargs):
self._options = kwargs
if app is not None:
self.init_app(app, **kwargs)
def init_app(self, app, **kwargs):
# The resources and options may be specified in the App Config, the CORS constructor
# or the kwargs to the call to init_app.
options = get_cors_options(app, self._options, kwargs)
# Flatten our resources into a list of the form
# (pattern_or_regexp, dictionary_of_options)
resources = parse_resources(options.get('resources'))
# Compute the options for each resource by combining the options from
# the app's configuration, the constructor, the kwargs to init_app, and
# finally the options specified in the resources dictionary.
resources = [
(pattern, get_cors_options(app, options, opts))
for (pattern, opts) in resources
]
# Create a human readable form of these resources by converting the compiled
# regular expressions into strings.
resources_human = {get_regexp_pattern(pattern): opts for (pattern,opts) in resources}
LOG.debug("Configuring CORS with resources: %s", resources_human)
cors_after_request = make_after_request_function(resources)
app.after_request(cors_after_request)
# Wrap exception handlers with cross_origin
# These error handlers will still respect the behavior of the route
if options.get('intercept_exceptions', True):
def _after_request_decorator(f):
def wrapped_function(*args, **kwargs):
return cors_after_request(app.make_response(f(*args, **kwargs)))
return wrapped_function
if hasattr(app, 'handle_exception'):
app.handle_exception = _after_request_decorator(
app.handle_exception)
app.handle_user_exception = _after_request_decorator(
app.handle_user_exception)
def make_after_request_function(resources):
def cors_after_request(resp):
# If CORS headers are set in a view decorator, pass
if resp.headers is not None and resp.headers.get(ACL_ORIGIN):
LOG.debug('CORS have been already evaluated, skipping')
return resp
normalized_path = unquote_plus(request.path)
for res_regex, res_options in resources:
if try_match(normalized_path, res_regex):
LOG.debug("Request to '%s' matches CORS resource '%s'. Using options: %s",
request.path, get_regexp_pattern(res_regex), res_options)
set_cors_headers(resp, res_options)
break
else:
LOG.debug('No CORS rule matches')
return resp
return cors_after_request
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/asyncsupport.py
|
# -*- coding: utf-8 -*-
"""The code for async support. Importing this patches Jinja on supported
Python versions.
"""
import asyncio
import inspect
from functools import update_wrapper
from markupsafe import Markup
from .environment import TemplateModule
from .runtime import LoopContext
from .utils import concat
from .utils import internalcode
from .utils import missing
async def concat_async(async_gen):
rv = []
async def collect():
async for event in async_gen:
rv.append(event)
await collect()
return concat(rv)
async def generate_async(self, *args, **kwargs):
vars = dict(*args, **kwargs)
try:
async for event in self.root_render_func(self.new_context(vars)):
yield event
except Exception:
yield self.environment.handle_exception()
def wrap_generate_func(original_generate):
def _convert_generator(self, loop, args, kwargs):
async_gen = self.generate_async(*args, **kwargs)
try:
while 1:
yield loop.run_until_complete(async_gen.__anext__())
except StopAsyncIteration:
pass
def generate(self, *args, **kwargs):
if not self.environment.is_async:
return original_generate(self, *args, **kwargs)
return _convert_generator(self, asyncio.get_event_loop(), args, kwargs)
return update_wrapper(generate, original_generate)
async def render_async(self, *args, **kwargs):
if not self.environment.is_async:
raise RuntimeError("The environment was not created with async mode enabled.")
vars = dict(*args, **kwargs)
ctx = self.new_context(vars)
try:
return await concat_async(self.root_render_func(ctx))
except Exception:
return self.environment.handle_exception()
def wrap_render_func(original_render):
def render(self, *args, **kwargs):
if not self.environment.is_async:
return original_render(self, *args, **kwargs)
loop = asyncio.get_event_loop()
return loop.run_until_complete(self.render_async(*args, **kwargs))
return update_wrapper(render, original_render)
def wrap_block_reference_call(original_call):
@internalcode
async def async_call(self):
rv = await concat_async(self._stack[self._depth](self._context))
if self._context.eval_ctx.autoescape:
rv = Markup(rv)
return rv
@internalcode
def __call__(self):
if not self._context.environment.is_async:
return original_call(self)
return async_call(self)
return update_wrapper(__call__, original_call)
def wrap_macro_invoke(original_invoke):
@internalcode
async def async_invoke(self, arguments, autoescape):
rv = await self._func(*arguments)
if autoescape:
rv = Markup(rv)
return rv
@internalcode
def _invoke(self, arguments, autoescape):
if not self._environment.is_async:
return original_invoke(self, arguments, autoescape)
return async_invoke(self, arguments, autoescape)
return update_wrapper(_invoke, original_invoke)
@internalcode
async def get_default_module_async(self):
if self._module is not None:
return self._module
self._module = rv = await self.make_module_async()
return rv
def wrap_default_module(original_default_module):
@internalcode
def _get_default_module(self):
if self.environment.is_async:
raise RuntimeError("Template module attribute is unavailable in async mode")
return original_default_module(self)
return _get_default_module
async def make_module_async(self, vars=None, shared=False, locals=None):
context = self.new_context(vars, shared, locals)
body_stream = []
async for item in self.root_render_func(context):
body_stream.append(item)
return TemplateModule(self, context, body_stream)
def patch_template():
from . import Template
Template.generate = wrap_generate_func(Template.generate)
Template.generate_async = update_wrapper(generate_async, Template.generate_async)
Template.render_async = update_wrapper(render_async, Template.render_async)
Template.render = wrap_render_func(Template.render)
Template._get_default_module = wrap_default_module(Template._get_default_module)
Template._get_default_module_async = get_default_module_async
Template.make_module_async = update_wrapper(
make_module_async, Template.make_module_async
)
def patch_runtime():
from .runtime import BlockReference, Macro
BlockReference.__call__ = wrap_block_reference_call(BlockReference.__call__)
Macro._invoke = wrap_macro_invoke(Macro._invoke)
def patch_filters():
from .filters import FILTERS
from .asyncfilters import ASYNC_FILTERS
FILTERS.update(ASYNC_FILTERS)
def patch_all():
patch_template()
patch_runtime()
patch_filters()
async def auto_await(value):
if inspect.isawaitable(value):
return await value
return value
async def auto_aiter(iterable):
if hasattr(iterable, "__aiter__"):
async for item in iterable:
yield item
return
for item in iterable:
yield item
class AsyncLoopContext(LoopContext):
_to_iterator = staticmethod(auto_aiter)
@property
async def length(self):
if self._length is not None:
return self._length
try:
self._length = len(self._iterable)
except TypeError:
iterable = [x async for x in self._iterator]
self._iterator = self._to_iterator(iterable)
self._length = len(iterable) + self.index + (self._after is not missing)
return self._length
@property
async def revindex0(self):
return await self.length - self.index
@property
async def revindex(self):
return await self.length - self.index0
async def _peek_next(self):
if self._after is not missing:
return self._after
try:
self._after = await self._iterator.__anext__()
except StopAsyncIteration:
self._after = missing
return self._after
@property
async def last(self):
return await self._peek_next() is missing
@property
async def nextitem(self):
rv = await self._peek_next()
if rv is missing:
return self._undefined("there is no next item")
return rv
def __aiter__(self):
return self
async def __anext__(self):
if self._after is not missing:
rv = self._after
self._after = missing
else:
rv = await self._iterator.__anext__()
self.index0 += 1
self._before = self._current
self._current = rv
return rv, self
async def make_async_loop_context(iterable, undefined, recurse=None, depth0=0):
import warnings
warnings.warn(
"This template must be recompiled with at least Jinja 2.11, or"
" it will fail in 3.0.",
DeprecationWarning,
stacklevel=2,
)
return AsyncLoopContext(iterable, undefined, recurse, depth0)
patch_all()
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/compiler.py
|
# -*- coding: utf-8 -*-
"""Compiles nodes from the parser into Python code."""
from collections import namedtuple
from functools import update_wrapper
from itertools import chain
from keyword import iskeyword as is_python_keyword
from markupsafe import escape
from markupsafe import Markup
from . import nodes
from ._compat import imap
from ._compat import iteritems
from ._compat import izip
from ._compat import NativeStringIO
from ._compat import range_type
from ._compat import string_types
from ._compat import text_type
from .exceptions import TemplateAssertionError
from .idtracking import Symbols
from .idtracking import VAR_LOAD_ALIAS
from .idtracking import VAR_LOAD_PARAMETER
from .idtracking import VAR_LOAD_RESOLVE
from .idtracking import VAR_LOAD_UNDEFINED
from .nodes import EvalContext
from .optimizer import Optimizer
from .utils import concat
from .visitor import NodeVisitor
operators = {
"eq": "==",
"ne": "!=",
"gt": ">",
"gteq": ">=",
"lt": "<",
"lteq": "<=",
"in": "in",
"notin": "not in",
}
# what method to iterate over items do we want to use for dict iteration
# in generated code? on 2.x let's go with iteritems, on 3.x with items
if hasattr(dict, "iteritems"):
dict_item_iter = "iteritems"
else:
dict_item_iter = "items"
code_features = ["division"]
# does this python version support generator stops? (PEP 0479)
try:
exec("from __future__ import generator_stop")
code_features.append("generator_stop")
except SyntaxError:
pass
# does this python version support yield from?
try:
exec("def f(): yield from x()")
except SyntaxError:
supports_yield_from = False
else:
supports_yield_from = True
def optimizeconst(f):
def new_func(self, node, frame, **kwargs):
# Only optimize if the frame is not volatile
if self.optimized and not frame.eval_ctx.volatile:
new_node = self.optimizer.visit(node, frame.eval_ctx)
if new_node != node:
return self.visit(new_node, frame)
return f(self, node, frame, **kwargs)
return update_wrapper(new_func, f)
def generate(
node, environment, name, filename, stream=None, defer_init=False, optimized=True
):
"""Generate the python source for a node tree."""
if not isinstance(node, nodes.Template):
raise TypeError("Can't compile non template nodes")
generator = environment.code_generator_class(
environment, name, filename, stream, defer_init, optimized
)
generator.visit(node)
if stream is None:
return generator.stream.getvalue()
def has_safe_repr(value):
"""Does the node have a safe representation?"""
if value is None or value is NotImplemented or value is Ellipsis:
return True
if type(value) in (bool, int, float, complex, range_type, Markup) + string_types:
return True
if type(value) in (tuple, list, set, frozenset):
for item in value:
if not has_safe_repr(item):
return False
return True
elif type(value) is dict:
for key, value in iteritems(value):
if not has_safe_repr(key):
return False
if not has_safe_repr(value):
return False
return True
return False
def find_undeclared(nodes, names):
"""Check if the names passed are accessed undeclared. The return value
is a set of all the undeclared names from the sequence of names found.
"""
visitor = UndeclaredNameVisitor(names)
try:
for node in nodes:
visitor.visit(node)
except VisitorExit:
pass
return visitor.undeclared
class MacroRef(object):
def __init__(self, node):
self.node = node
self.accesses_caller = False
self.accesses_kwargs = False
self.accesses_varargs = False
class Frame(object):
"""Holds compile time information for us."""
def __init__(self, eval_ctx, parent=None, level=None):
self.eval_ctx = eval_ctx
self.symbols = Symbols(parent and parent.symbols or None, level=level)
# a toplevel frame is the root + soft frames such as if conditions.
self.toplevel = False
# the root frame is basically just the outermost frame, so no if
# conditions. This information is used to optimize inheritance
# situations.
self.rootlevel = False
# in some dynamic inheritance situations the compiler needs to add
# write tests around output statements.
self.require_output_check = parent and parent.require_output_check
# inside some tags we are using a buffer rather than yield statements.
# this for example affects {% filter %} or {% macro %}. If a frame
# is buffered this variable points to the name of the list used as
# buffer.
self.buffer = None
# the name of the block we're in, otherwise None.
self.block = parent and parent.block or None
# the parent of this frame
self.parent = parent
if parent is not None:
self.buffer = parent.buffer
def copy(self):
"""Create a copy of the current one."""
rv = object.__new__(self.__class__)
rv.__dict__.update(self.__dict__)
rv.symbols = self.symbols.copy()
return rv
def inner(self, isolated=False):
"""Return an inner frame."""
if isolated:
return Frame(self.eval_ctx, level=self.symbols.level + 1)
return Frame(self.eval_ctx, self)
def soft(self):
"""Return a soft frame. A soft frame may not be modified as
standalone thing as it shares the resources with the frame it
was created of, but it's not a rootlevel frame any longer.
This is only used to implement if-statements.
"""
rv = self.copy()
rv.rootlevel = False
return rv
__copy__ = copy
class VisitorExit(RuntimeError):
"""Exception used by the `UndeclaredNameVisitor` to signal a stop."""
class DependencyFinderVisitor(NodeVisitor):
"""A visitor that collects filter and test calls."""
def __init__(self):
self.filters = set()
self.tests = set()
def visit_Filter(self, node):
self.generic_visit(node)
self.filters.add(node.name)
def visit_Test(self, node):
self.generic_visit(node)
self.tests.add(node.name)
def visit_Block(self, node):
"""Stop visiting at blocks."""
class UndeclaredNameVisitor(NodeVisitor):
"""A visitor that checks if a name is accessed without being
declared. This is different from the frame visitor as it will
not stop at closure frames.
"""
def __init__(self, names):
self.names = set(names)
self.undeclared = set()
def visit_Name(self, node):
if node.ctx == "load" and node.name in self.names:
self.undeclared.add(node.name)
if self.undeclared == self.names:
raise VisitorExit()
else:
self.names.discard(node.name)
def visit_Block(self, node):
"""Stop visiting a blocks."""
class CompilerExit(Exception):
"""Raised if the compiler encountered a situation where it just
doesn't make sense to further process the code. Any block that
raises such an exception is not further processed.
"""
class CodeGenerator(NodeVisitor):
def __init__(
self, environment, name, filename, stream=None, defer_init=False, optimized=True
):
if stream is None:
stream = NativeStringIO()
self.environment = environment
self.name = name
self.filename = filename
self.stream = stream
self.created_block_context = False
self.defer_init = defer_init
self.optimized = optimized
if optimized:
self.optimizer = Optimizer(environment)
# aliases for imports
self.import_aliases = {}
# a registry for all blocks. Because blocks are moved out
# into the global python scope they are registered here
self.blocks = {}
# the number of extends statements so far
self.extends_so_far = 0
# some templates have a rootlevel extends. In this case we
# can safely assume that we're a child template and do some
# more optimizations.
self.has_known_extends = False
# the current line number
self.code_lineno = 1
# registry of all filters and tests (global, not block local)
self.tests = {}
self.filters = {}
# the debug information
self.debug_info = []
self._write_debug_info = None
# the number of new lines before the next write()
self._new_lines = 0
# the line number of the last written statement
self._last_line = 0
# true if nothing was written so far.
self._first_write = True
# used by the `temporary_identifier` method to get new
# unique, temporary identifier
self._last_identifier = 0
# the current indentation
self._indentation = 0
# Tracks toplevel assignments
self._assign_stack = []
# Tracks parameter definition blocks
self._param_def_block = []
# Tracks the current context.
self._context_reference_stack = ["context"]
# -- Various compilation helpers
def fail(self, msg, lineno):
"""Fail with a :exc:`TemplateAssertionError`."""
raise TemplateAssertionError(msg, lineno, self.name, self.filename)
def temporary_identifier(self):
"""Get a new unique identifier."""
self._last_identifier += 1
return "t_%d" % self._last_identifier
def buffer(self, frame):
"""Enable buffering for the frame from that point onwards."""
frame.buffer = self.temporary_identifier()
self.writeline("%s = []" % frame.buffer)
def return_buffer_contents(self, frame, force_unescaped=False):
"""Return the buffer contents of the frame."""
if not force_unescaped:
if frame.eval_ctx.volatile:
self.writeline("if context.eval_ctx.autoescape:")
self.indent()
self.writeline("return Markup(concat(%s))" % frame.buffer)
self.outdent()
self.writeline("else:")
self.indent()
self.writeline("return concat(%s)" % frame.buffer)
self.outdent()
return
elif frame.eval_ctx.autoescape:
self.writeline("return Markup(concat(%s))" % frame.buffer)
return
self.writeline("return concat(%s)" % frame.buffer)
def indent(self):
"""Indent by one."""
self._indentation += 1
def outdent(self, step=1):
"""Outdent by step."""
self._indentation -= step
def start_write(self, frame, node=None):
"""Yield or write into the frame buffer."""
if frame.buffer is None:
self.writeline("yield ", node)
else:
self.writeline("%s.append(" % frame.buffer, node)
def end_write(self, frame):
"""End the writing process started by `start_write`."""
if frame.buffer is not None:
self.write(")")
def simple_write(self, s, frame, node=None):
"""Simple shortcut for start_write + write + end_write."""
self.start_write(frame, node)
self.write(s)
self.end_write(frame)
def blockvisit(self, nodes, frame):
"""Visit a list of nodes as block in a frame. If the current frame
is no buffer a dummy ``if 0: yield None`` is written automatically.
"""
try:
self.writeline("pass")
for node in nodes:
self.visit(node, frame)
except CompilerExit:
pass
def write(self, x):
"""Write a string into the output stream."""
if self._new_lines:
if not self._first_write:
self.stream.write("\n" * self._new_lines)
self.code_lineno += self._new_lines
if self._write_debug_info is not None:
self.debug_info.append((self._write_debug_info, self.code_lineno))
self._write_debug_info = None
self._first_write = False
self.stream.write(" " * self._indentation)
self._new_lines = 0
self.stream.write(x)
def writeline(self, x, node=None, extra=0):
"""Combination of newline and write."""
self.newline(node, extra)
self.write(x)
def newline(self, node=None, extra=0):
"""Add one or more newlines before the next write."""
self._new_lines = max(self._new_lines, 1 + extra)
if node is not None and node.lineno != self._last_line:
self._write_debug_info = node.lineno
self._last_line = node.lineno
def signature(self, node, frame, extra_kwargs=None):
"""Writes a function call to the stream for the current node.
A leading comma is added automatically. The extra keyword
arguments may not include python keywords otherwise a syntax
error could occur. The extra keyword arguments should be given
as python dict.
"""
# if any of the given keyword arguments is a python keyword
# we have to make sure that no invalid call is created.
kwarg_workaround = False
for kwarg in chain((x.key for x in node.kwargs), extra_kwargs or ()):
if is_python_keyword(kwarg):
kwarg_workaround = True
break
for arg in node.args:
self.write(", ")
self.visit(arg, frame)
if not kwarg_workaround:
for kwarg in node.kwargs:
self.write(", ")
self.visit(kwarg, frame)
if extra_kwargs is not None:
for key, value in iteritems(extra_kwargs):
self.write(", %s=%s" % (key, value))
if node.dyn_args:
self.write(", *")
self.visit(node.dyn_args, frame)
if kwarg_workaround:
if node.dyn_kwargs is not None:
self.write(", **dict({")
else:
self.write(", **{")
for kwarg in node.kwargs:
self.write("%r: " % kwarg.key)
self.visit(kwarg.value, frame)
self.write(", ")
if extra_kwargs is not None:
for key, value in iteritems(extra_kwargs):
self.write("%r: %s, " % (key, value))
if node.dyn_kwargs is not None:
self.write("}, **")
self.visit(node.dyn_kwargs, frame)
self.write(")")
else:
self.write("}")
elif node.dyn_kwargs is not None:
self.write(", **")
self.visit(node.dyn_kwargs, frame)
def pull_dependencies(self, nodes):
"""Pull all the dependencies."""
visitor = DependencyFinderVisitor()
for node in nodes:
visitor.visit(node)
for dependency in "filters", "tests":
mapping = getattr(self, dependency)
for name in getattr(visitor, dependency):
if name not in mapping:
mapping[name] = self.temporary_identifier()
self.writeline(
"%s = environment.%s[%r]" % (mapping[name], dependency, name)
)
def enter_frame(self, frame):
undefs = []
for target, (action, param) in iteritems(frame.symbols.loads):
if action == VAR_LOAD_PARAMETER:
pass
elif action == VAR_LOAD_RESOLVE:
self.writeline("%s = %s(%r)" % (target, self.get_resolve_func(), param))
elif action == VAR_LOAD_ALIAS:
self.writeline("%s = %s" % (target, param))
elif action == VAR_LOAD_UNDEFINED:
undefs.append(target)
else:
raise NotImplementedError("unknown load instruction")
if undefs:
self.writeline("%s = missing" % " = ".join(undefs))
def leave_frame(self, frame, with_python_scope=False):
if not with_python_scope:
undefs = []
for target, _ in iteritems(frame.symbols.loads):
undefs.append(target)
if undefs:
self.writeline("%s = missing" % " = ".join(undefs))
def func(self, name):
if self.environment.is_async:
return "async def %s" % name
return "def %s" % name
def macro_body(self, node, frame):
"""Dump the function def of a macro or call block."""
frame = frame.inner()
frame.symbols.analyze_node(node)
macro_ref = MacroRef(node)
explicit_caller = None
skip_special_params = set()
args = []
for idx, arg in enumerate(node.args):
if arg.name == "caller":
explicit_caller = idx
if arg.name in ("kwargs", "varargs"):
skip_special_params.add(arg.name)
args.append(frame.symbols.ref(arg.name))
undeclared = find_undeclared(node.body, ("caller", "kwargs", "varargs"))
if "caller" in undeclared:
# In older Jinja versions there was a bug that allowed caller
# to retain the special behavior even if it was mentioned in
# the argument list. However thankfully this was only really
# working if it was the last argument. So we are explicitly
# checking this now and error out if it is anywhere else in
# the argument list.
if explicit_caller is not None:
try:
node.defaults[explicit_caller - len(node.args)]
except IndexError:
self.fail(
"When defining macros or call blocks the "
'special "caller" argument must be omitted '
"or be given a default.",
node.lineno,
)
else:
args.append(frame.symbols.declare_parameter("caller"))
macro_ref.accesses_caller = True
if "kwargs" in undeclared and "kwargs" not in skip_special_params:
args.append(frame.symbols.declare_parameter("kwargs"))
macro_ref.accesses_kwargs = True
if "varargs" in undeclared and "varargs" not in skip_special_params:
args.append(frame.symbols.declare_parameter("varargs"))
macro_ref.accesses_varargs = True
# macros are delayed, they never require output checks
frame.require_output_check = False
frame.symbols.analyze_node(node)
self.writeline("%s(%s):" % (self.func("macro"), ", ".join(args)), node)
self.indent()
self.buffer(frame)
self.enter_frame(frame)
self.push_parameter_definitions(frame)
for idx, arg in enumerate(node.args):
ref = frame.symbols.ref(arg.name)
self.writeline("if %s is missing:" % ref)
self.indent()
try:
default = node.defaults[idx - len(node.args)]
except IndexError:
self.writeline(
"%s = undefined(%r, name=%r)"
% (ref, "parameter %r was not provided" % arg.name, arg.name)
)
else:
self.writeline("%s = " % ref)
self.visit(default, frame)
self.mark_parameter_stored(ref)
self.outdent()
self.pop_parameter_definitions()
self.blockvisit(node.body, frame)
self.return_buffer_contents(frame, force_unescaped=True)
self.leave_frame(frame, with_python_scope=True)
self.outdent()
return frame, macro_ref
def macro_def(self, macro_ref, frame):
"""Dump the macro definition for the def created by macro_body."""
arg_tuple = ", ".join(repr(x.name) for x in macro_ref.node.args)
name = getattr(macro_ref.node, "name", None)
if len(macro_ref.node.args) == 1:
arg_tuple += ","
self.write(
"Macro(environment, macro, %r, (%s), %r, %r, %r, "
"context.eval_ctx.autoescape)"
% (
name,
arg_tuple,
macro_ref.accesses_kwargs,
macro_ref.accesses_varargs,
macro_ref.accesses_caller,
)
)
def position(self, node):
"""Return a human readable position for the node."""
rv = "line %d" % node.lineno
if self.name is not None:
rv += " in " + repr(self.name)
return rv
def dump_local_context(self, frame):
return "{%s}" % ", ".join(
"%r: %s" % (name, target)
for name, target in iteritems(frame.symbols.dump_stores())
)
def write_commons(self):
"""Writes a common preamble that is used by root and block functions.
Primarily this sets up common local helpers and enforces a generator
through a dead branch.
"""
self.writeline("resolve = context.resolve_or_missing")
self.writeline("undefined = environment.undefined")
# always use the standard Undefined class for the implicit else of
# conditional expressions
self.writeline("cond_expr_undefined = Undefined")
self.writeline("if 0: yield None")
def push_parameter_definitions(self, frame):
"""Pushes all parameter targets from the given frame into a local
stack that permits tracking of yet to be assigned parameters. In
particular this enables the optimization from `visit_Name` to skip
undefined expressions for parameters in macros as macros can reference
otherwise unbound parameters.
"""
self._param_def_block.append(frame.symbols.dump_param_targets())
def pop_parameter_definitions(self):
"""Pops the current parameter definitions set."""
self._param_def_block.pop()
def mark_parameter_stored(self, target):
"""Marks a parameter in the current parameter definitions as stored.
This will skip the enforced undefined checks.
"""
if self._param_def_block:
self._param_def_block[-1].discard(target)
def push_context_reference(self, target):
self._context_reference_stack.append(target)
def pop_context_reference(self):
self._context_reference_stack.pop()
def get_context_ref(self):
return self._context_reference_stack[-1]
def get_resolve_func(self):
target = self._context_reference_stack[-1]
if target == "context":
return "resolve"
return "%s.resolve" % target
def derive_context(self, frame):
return "%s.derived(%s)" % (
self.get_context_ref(),
self.dump_local_context(frame),
)
def parameter_is_undeclared(self, target):
"""Checks if a given target is an undeclared parameter."""
if not self._param_def_block:
return False
return target in self._param_def_block[-1]
def push_assign_tracking(self):
"""Pushes a new layer for assignment tracking."""
self._assign_stack.append(set())
def pop_assign_tracking(self, frame):
"""Pops the topmost level for assignment tracking and updates the
context variables if necessary.
"""
vars = self._assign_stack.pop()
if not frame.toplevel or not vars:
return
public_names = [x for x in vars if x[:1] != "_"]
if len(vars) == 1:
name = next(iter(vars))
ref = frame.symbols.ref(name)
self.writeline("context.vars[%r] = %s" % (name, ref))
else:
self.writeline("context.vars.update({")
for idx, name in enumerate(vars):
if idx:
self.write(", ")
ref = frame.symbols.ref(name)
self.write("%r: %s" % (name, ref))
self.write("})")
if public_names:
if len(public_names) == 1:
self.writeline("context.exported_vars.add(%r)" % public_names[0])
else:
self.writeline(
"context.exported_vars.update((%s))"
% ", ".join(imap(repr, public_names))
)
# -- Statement Visitors
def visit_Template(self, node, frame=None):
assert frame is None, "no root frame allowed"
eval_ctx = EvalContext(self.environment, self.name)
from .runtime import exported
self.writeline("from __future__ import %s" % ", ".join(code_features))
self.writeline("from jinja2.runtime import " + ", ".join(exported))
if self.environment.is_async:
self.writeline(
"from jinja2.asyncsupport import auto_await, "
"auto_aiter, AsyncLoopContext"
)
# if we want a deferred initialization we cannot move the
# environment into a local name
envenv = not self.defer_init and ", environment=environment" or ""
# do we have an extends tag at all? If not, we can save some
# overhead by just not processing any inheritance code.
have_extends = node.find(nodes.Extends) is not None
# find all blocks
for block in node.find_all(nodes.Block):
if block.name in self.blocks:
self.fail("block %r defined twice" % block.name, block.lineno)
self.blocks[block.name] = block
# find all imports and import them
for import_ in node.find_all(nodes.ImportedName):
if import_.importname not in self.import_aliases:
imp = import_.importname
self.import_aliases[imp] = alias = self.temporary_identifier()
if "." in imp:
module, obj = imp.rsplit(".", 1)
self.writeline("from %s import %s as %s" % (module, obj, alias))
else:
self.writeline("import %s as %s" % (imp, alias))
# add the load name
self.writeline("name = %r" % self.name)
# generate the root render function.
self.writeline(
"%s(context, missing=missing%s):" % (self.func("root"), envenv), extra=1
)
self.indent()
self.write_commons()
# process the root
frame = Frame(eval_ctx)
if "self" in find_undeclared(node.body, ("self",)):
ref = frame.symbols.declare_parameter("self")
self.writeline("%s = TemplateReference(context)" % ref)
frame.symbols.analyze_node(node)
frame.toplevel = frame.rootlevel = True
frame.require_output_check = have_extends and not self.has_known_extends
if have_extends:
self.writeline("parent_template = None")
self.enter_frame(frame)
self.pull_dependencies(node.body)
self.blockvisit(node.body, frame)
self.leave_frame(frame, with_python_scope=True)
self.outdent()
# make sure that the parent root is called.
if have_extends:
if not self.has_known_extends:
self.indent()
self.writeline("if parent_template is not None:")
self.indent()
if supports_yield_from and not self.environment.is_async:
self.writeline("yield from parent_template.root_render_func(context)")
else:
self.writeline(
"%sfor event in parent_template."
"root_render_func(context):"
% (self.environment.is_async and "async " or "")
)
self.indent()
self.writeline("yield event")
self.outdent()
self.outdent(1 + (not self.has_known_extends))
# at this point we now have the blocks collected and can visit them too.
for name, block in iteritems(self.blocks):
self.writeline(
"%s(context, missing=missing%s):"
% (self.func("block_" + name), envenv),
block,
1,
)
self.indent()
self.write_commons()
# It's important that we do not make this frame a child of the
# toplevel template. This would cause a variety of
# interesting issues with identifier tracking.
block_frame = Frame(eval_ctx)
undeclared = find_undeclared(block.body, ("self", "super"))
if "self" in undeclared:
ref = block_frame.symbols.declare_parameter("self")
self.writeline("%s = TemplateReference(context)" % ref)
if "super" in undeclared:
ref = block_frame.symbols.declare_parameter("super")
self.writeline("%s = context.super(%r, block_%s)" % (ref, name, name))
block_frame.symbols.analyze_node(block)
block_frame.block = name
self.enter_frame(block_frame)
self.pull_dependencies(block.body)
self.blockvisit(block.body, block_frame)
self.leave_frame(block_frame, with_python_scope=True)
self.outdent()
self.writeline(
"blocks = {%s}" % ", ".join("%r: block_%s" % (x, x) for x in self.blocks),
extra=1,
)
# add a function that returns the debug info
self.writeline(
"debug_info = %r" % "&".join("%s=%s" % x for x in self.debug_info)
)
def visit_Block(self, node, frame):
"""Call a block and register it for the template."""
level = 0
if frame.toplevel:
# if we know that we are a child template, there is no need to
# check if we are one
if self.has_known_extends:
return
if self.extends_so_far > 0:
self.writeline("if parent_template is None:")
self.indent()
level += 1
if node.scoped:
context = self.derive_context(frame)
else:
context = self.get_context_ref()
if (
supports_yield_from
and not self.environment.is_async
and frame.buffer is None
):
self.writeline(
"yield from context.blocks[%r][0](%s)" % (node.name, context), node
)
else:
loop = self.environment.is_async and "async for" or "for"
self.writeline(
"%s event in context.blocks[%r][0](%s):" % (loop, node.name, context),
node,
)
self.indent()
self.simple_write("event", frame)
self.outdent()
self.outdent(level)
def visit_Extends(self, node, frame):
"""Calls the extender."""
if not frame.toplevel:
self.fail("cannot use extend from a non top-level scope", node.lineno)
# if the number of extends statements in general is zero so
# far, we don't have to add a check if something extended
# the template before this one.
if self.extends_so_far > 0:
# if we have a known extends we just add a template runtime
# error into the generated code. We could catch that at compile
# time too, but i welcome it not to confuse users by throwing the
# same error at different times just "because we can".
if not self.has_known_extends:
self.writeline("if parent_template is not None:")
self.indent()
self.writeline("raise TemplateRuntimeError(%r)" % "extended multiple times")
# if we have a known extends already we don't need that code here
# as we know that the template execution will end here.
if self.has_known_extends:
raise CompilerExit()
else:
self.outdent()
self.writeline("parent_template = environment.get_template(", node)
self.visit(node.template, frame)
self.write(", %r)" % self.name)
self.writeline(
"for name, parent_block in parent_template.blocks.%s():" % dict_item_iter
)
self.indent()
self.writeline("context.blocks.setdefault(name, []).append(parent_block)")
self.outdent()
# if this extends statement was in the root level we can take
# advantage of that information and simplify the generated code
# in the top level from this point onwards
if frame.rootlevel:
self.has_known_extends = True
# and now we have one more
self.extends_so_far += 1
def visit_Include(self, node, frame):
"""Handles includes."""
if node.ignore_missing:
self.writeline("try:")
self.indent()
func_name = "get_or_select_template"
if isinstance(node.template, nodes.Const):
if isinstance(node.template.value, string_types):
func_name = "get_template"
elif isinstance(node.template.value, (tuple, list)):
func_name = "select_template"
elif isinstance(node.template, (nodes.Tuple, nodes.List)):
func_name = "select_template"
self.writeline("template = environment.%s(" % func_name, node)
self.visit(node.template, frame)
self.write(", %r)" % self.name)
if node.ignore_missing:
self.outdent()
self.writeline("except TemplateNotFound:")
self.indent()
self.writeline("pass")
self.outdent()
self.writeline("else:")
self.indent()
skip_event_yield = False
if node.with_context:
loop = self.environment.is_async and "async for" or "for"
self.writeline(
"%s event in template.root_render_func("
"template.new_context(context.get_all(), True, "
"%s)):" % (loop, self.dump_local_context(frame))
)
elif self.environment.is_async:
self.writeline(
"for event in (await "
"template._get_default_module_async())"
"._body_stream:"
)
else:
if supports_yield_from:
self.writeline("yield from template._get_default_module()._body_stream")
skip_event_yield = True
else:
self.writeline(
"for event in template._get_default_module()._body_stream:"
)
if not skip_event_yield:
self.indent()
self.simple_write("event", frame)
self.outdent()
if node.ignore_missing:
self.outdent()
def visit_Import(self, node, frame):
"""Visit regular imports."""
self.writeline("%s = " % frame.symbols.ref(node.target), node)
if frame.toplevel:
self.write("context.vars[%r] = " % node.target)
if self.environment.is_async:
self.write("await ")
self.write("environment.get_template(")
self.visit(node.template, frame)
self.write(", %r)." % self.name)
if node.with_context:
self.write(
"make_module%s(context.get_all(), True, %s)"
% (
self.environment.is_async and "_async" or "",
self.dump_local_context(frame),
)
)
elif self.environment.is_async:
self.write("_get_default_module_async()")
else:
self.write("_get_default_module()")
if frame.toplevel and not node.target.startswith("_"):
self.writeline("context.exported_vars.discard(%r)" % node.target)
def visit_FromImport(self, node, frame):
"""Visit named imports."""
self.newline(node)
self.write(
"included_template = %senvironment.get_template("
% (self.environment.is_async and "await " or "")
)
self.visit(node.template, frame)
self.write(", %r)." % self.name)
if node.with_context:
self.write(
"make_module%s(context.get_all(), True, %s)"
% (
self.environment.is_async and "_async" or "",
self.dump_local_context(frame),
)
)
elif self.environment.is_async:
self.write("_get_default_module_async()")
else:
self.write("_get_default_module()")
var_names = []
discarded_names = []
for name in node.names:
if isinstance(name, tuple):
name, alias = name
else:
alias = name
self.writeline(
"%s = getattr(included_template, "
"%r, missing)" % (frame.symbols.ref(alias), name)
)
self.writeline("if %s is missing:" % frame.symbols.ref(alias))
self.indent()
self.writeline(
"%s = undefined(%r %% "
"included_template.__name__, "
"name=%r)"
% (
frame.symbols.ref(alias),
"the template %%r (imported on %s) does "
"not export the requested name %s"
% (self.position(node), repr(name)),
name,
)
)
self.outdent()
if frame.toplevel:
var_names.append(alias)
if not alias.startswith("_"):
discarded_names.append(alias)
if var_names:
if len(var_names) == 1:
name = var_names[0]
self.writeline(
"context.vars[%r] = %s" % (name, frame.symbols.ref(name))
)
else:
self.writeline(
"context.vars.update({%s})"
% ", ".join(
"%r: %s" % (name, frame.symbols.ref(name)) for name in var_names
)
)
if discarded_names:
if len(discarded_names) == 1:
self.writeline("context.exported_vars.discard(%r)" % discarded_names[0])
else:
self.writeline(
"context.exported_vars.difference_"
"update((%s))" % ", ".join(imap(repr, discarded_names))
)
def visit_For(self, node, frame):
loop_frame = frame.inner()
test_frame = frame.inner()
else_frame = frame.inner()
# try to figure out if we have an extended loop. An extended loop
# is necessary if the loop is in recursive mode if the special loop
# variable is accessed in the body.
extended_loop = node.recursive or "loop" in find_undeclared(
node.iter_child_nodes(only=("body",)), ("loop",)
)
loop_ref = None
if extended_loop:
loop_ref = loop_frame.symbols.declare_parameter("loop")
loop_frame.symbols.analyze_node(node, for_branch="body")
if node.else_:
else_frame.symbols.analyze_node(node, for_branch="else")
if node.test:
loop_filter_func = self.temporary_identifier()
test_frame.symbols.analyze_node(node, for_branch="test")
self.writeline("%s(fiter):" % self.func(loop_filter_func), node.test)
self.indent()
self.enter_frame(test_frame)
self.writeline(self.environment.is_async and "async for " or "for ")
self.visit(node.target, loop_frame)
self.write(" in ")
self.write(self.environment.is_async and "auto_aiter(fiter)" or "fiter")
self.write(":")
self.indent()
self.writeline("if ", node.test)
self.visit(node.test, test_frame)
self.write(":")
self.indent()
self.writeline("yield ")
self.visit(node.target, loop_frame)
self.outdent(3)
self.leave_frame(test_frame, with_python_scope=True)
# if we don't have an recursive loop we have to find the shadowed
# variables at that point. Because loops can be nested but the loop
# variable is a special one we have to enforce aliasing for it.
if node.recursive:
self.writeline(
"%s(reciter, loop_render_func, depth=0):" % self.func("loop"), node
)
self.indent()
self.buffer(loop_frame)
# Use the same buffer for the else frame
else_frame.buffer = loop_frame.buffer
# make sure the loop variable is a special one and raise a template
# assertion error if a loop tries to write to loop
if extended_loop:
self.writeline("%s = missing" % loop_ref)
for name in node.find_all(nodes.Name):
if name.ctx == "store" and name.name == "loop":
self.fail(
"Can't assign to special loop variable in for-loop target",
name.lineno,
)
if node.else_:
iteration_indicator = self.temporary_identifier()
self.writeline("%s = 1" % iteration_indicator)
self.writeline(self.environment.is_async and "async for " or "for ", node)
self.visit(node.target, loop_frame)
if extended_loop:
if self.environment.is_async:
self.write(", %s in AsyncLoopContext(" % loop_ref)
else:
self.write(", %s in LoopContext(" % loop_ref)
else:
self.write(" in ")
if node.test:
self.write("%s(" % loop_filter_func)
if node.recursive:
self.write("reciter")
else:
if self.environment.is_async and not extended_loop:
self.write("auto_aiter(")
self.visit(node.iter, frame)
if self.environment.is_async and not extended_loop:
self.write(")")
if node.test:
self.write(")")
if node.recursive:
self.write(", undefined, loop_render_func, depth):")
else:
self.write(extended_loop and ", undefined):" or ":")
self.indent()
self.enter_frame(loop_frame)
self.blockvisit(node.body, loop_frame)
if node.else_:
self.writeline("%s = 0" % iteration_indicator)
self.outdent()
self.leave_frame(
loop_frame, with_python_scope=node.recursive and not node.else_
)
if node.else_:
self.writeline("if %s:" % iteration_indicator)
self.indent()
self.enter_frame(else_frame)
self.blockvisit(node.else_, else_frame)
self.leave_frame(else_frame)
self.outdent()
# if the node was recursive we have to return the buffer contents
# and start the iteration code
if node.recursive:
self.return_buffer_contents(loop_frame)
self.outdent()
self.start_write(frame, node)
if self.environment.is_async:
self.write("await ")
self.write("loop(")
if self.environment.is_async:
self.write("auto_aiter(")
self.visit(node.iter, frame)
if self.environment.is_async:
self.write(")")
self.write(", loop)")
self.end_write(frame)
def visit_If(self, node, frame):
if_frame = frame.soft()
self.writeline("if ", node)
self.visit(node.test, if_frame)
self.write(":")
self.indent()
self.blockvisit(node.body, if_frame)
self.outdent()
for elif_ in node.elif_:
self.writeline("elif ", elif_)
self.visit(elif_.test, if_frame)
self.write(":")
self.indent()
self.blockvisit(elif_.body, if_frame)
self.outdent()
if node.else_:
self.writeline("else:")
self.indent()
self.blockvisit(node.else_, if_frame)
self.outdent()
def visit_Macro(self, node, frame):
macro_frame, macro_ref = self.macro_body(node, frame)
self.newline()
if frame.toplevel:
if not node.name.startswith("_"):
self.write("context.exported_vars.add(%r)" % node.name)
self.writeline("context.vars[%r] = " % node.name)
self.write("%s = " % frame.symbols.ref(node.name))
self.macro_def(macro_ref, macro_frame)
def visit_CallBlock(self, node, frame):
call_frame, macro_ref = self.macro_body(node, frame)
self.writeline("caller = ")
self.macro_def(macro_ref, call_frame)
self.start_write(frame, node)
self.visit_Call(node.call, frame, forward_caller=True)
self.end_write(frame)
def visit_FilterBlock(self, node, frame):
filter_frame = frame.inner()
filter_frame.symbols.analyze_node(node)
self.enter_frame(filter_frame)
self.buffer(filter_frame)
self.blockvisit(node.body, filter_frame)
self.start_write(frame, node)
self.visit_Filter(node.filter, filter_frame)
self.end_write(frame)
self.leave_frame(filter_frame)
def visit_With(self, node, frame):
with_frame = frame.inner()
with_frame.symbols.analyze_node(node)
self.enter_frame(with_frame)
for target, expr in izip(node.targets, node.values):
self.newline()
self.visit(target, with_frame)
self.write(" = ")
self.visit(expr, frame)
self.blockvisit(node.body, with_frame)
self.leave_frame(with_frame)
def visit_ExprStmt(self, node, frame):
self.newline(node)
self.visit(node.node, frame)
_FinalizeInfo = namedtuple("_FinalizeInfo", ("const", "src"))
#: The default finalize function if the environment isn't configured
#: with one. Or if the environment has one, this is called on that
#: function's output for constants.
_default_finalize = text_type
_finalize = None
def _make_finalize(self):
"""Build the finalize function to be used on constants and at
runtime. Cached so it's only created once for all output nodes.
Returns a ``namedtuple`` with the following attributes:
``const``
A function to finalize constant data at compile time.
``src``
Source code to output around nodes to be evaluated at
runtime.
"""
if self._finalize is not None:
return self._finalize
finalize = default = self._default_finalize
src = None
if self.environment.finalize:
src = "environment.finalize("
env_finalize = self.environment.finalize
def finalize(value):
return default(env_finalize(value))
if getattr(env_finalize, "contextfunction", False) is True:
src += "context, "
finalize = None # noqa: F811
elif getattr(env_finalize, "evalcontextfunction", False) is True:
src += "context.eval_ctx, "
finalize = None
elif getattr(env_finalize, "environmentfunction", False) is True:
src += "environment, "
def finalize(value):
return default(env_finalize(self.environment, value))
self._finalize = self._FinalizeInfo(finalize, src)
return self._finalize
def _output_const_repr(self, group):
"""Given a group of constant values converted from ``Output``
child nodes, produce a string to write to the template module
source.
"""
return repr(concat(group))
def _output_child_to_const(self, node, frame, finalize):
"""Try to optimize a child of an ``Output`` node by trying to
convert it to constant, finalized data at compile time.
If :exc:`Impossible` is raised, the node is not constant and
will be evaluated at runtime. Any other exception will also be
evaluated at runtime for easier debugging.
"""
const = node.as_const(frame.eval_ctx)
if frame.eval_ctx.autoescape:
const = escape(const)
# Template data doesn't go through finalize.
if isinstance(node, nodes.TemplateData):
return text_type(const)
return finalize.const(const)
def _output_child_pre(self, node, frame, finalize):
"""Output extra source code before visiting a child of an
``Output`` node.
"""
if frame.eval_ctx.volatile:
self.write("(escape if context.eval_ctx.autoescape else to_string)(")
elif frame.eval_ctx.autoescape:
self.write("escape(")
else:
self.write("to_string(")
if finalize.src is not None:
self.write(finalize.src)
def _output_child_post(self, node, frame, finalize):
"""Output extra source code after visiting a child of an
``Output`` node.
"""
self.write(")")
if finalize.src is not None:
self.write(")")
def visit_Output(self, node, frame):
# If an extends is active, don't render outside a block.
if frame.require_output_check:
# A top-level extends is known to exist at compile time.
if self.has_known_extends:
return
self.writeline("if parent_template is None:")
self.indent()
finalize = self._make_finalize()
body = []
# Evaluate constants at compile time if possible. Each item in
# body will be either a list of static data or a node to be
# evaluated at runtime.
for child in node.nodes:
try:
if not (
# If the finalize function requires runtime context,
# constants can't be evaluated at compile time.
finalize.const
# Unless it's basic template data that won't be
# finalized anyway.
or isinstance(child, nodes.TemplateData)
):
raise nodes.Impossible()
const = self._output_child_to_const(child, frame, finalize)
except (nodes.Impossible, Exception):
# The node was not constant and needs to be evaluated at
# runtime. Or another error was raised, which is easier
# to debug at runtime.
body.append(child)
continue
if body and isinstance(body[-1], list):
body[-1].append(const)
else:
body.append([const])
if frame.buffer is not None:
if len(body) == 1:
self.writeline("%s.append(" % frame.buffer)
else:
self.writeline("%s.extend((" % frame.buffer)
self.indent()
for item in body:
if isinstance(item, list):
# A group of constant data to join and output.
val = self._output_const_repr(item)
if frame.buffer is None:
self.writeline("yield " + val)
else:
self.writeline(val + ",")
else:
if frame.buffer is None:
self.writeline("yield ", item)
else:
self.newline(item)
# A node to be evaluated at runtime.
self._output_child_pre(item, frame, finalize)
self.visit(item, frame)
self._output_child_post(item, frame, finalize)
if frame.buffer is not None:
self.write(",")
if frame.buffer is not None:
self.outdent()
self.writeline(")" if len(body) == 1 else "))")
if frame.require_output_check:
self.outdent()
def visit_Assign(self, node, frame):
self.push_assign_tracking()
self.newline(node)
self.visit(node.target, frame)
self.write(" = ")
self.visit(node.node, frame)
self.pop_assign_tracking(frame)
def visit_AssignBlock(self, node, frame):
self.push_assign_tracking()
block_frame = frame.inner()
# This is a special case. Since a set block always captures we
# will disable output checks. This way one can use set blocks
# toplevel even in extended templates.
block_frame.require_output_check = False
block_frame.symbols.analyze_node(node)
self.enter_frame(block_frame)
self.buffer(block_frame)
self.blockvisit(node.body, block_frame)
self.newline(node)
self.visit(node.target, frame)
self.write(" = (Markup if context.eval_ctx.autoescape else identity)(")
if node.filter is not None:
self.visit_Filter(node.filter, block_frame)
else:
self.write("concat(%s)" % block_frame.buffer)
self.write(")")
self.pop_assign_tracking(frame)
self.leave_frame(block_frame)
# -- Expression Visitors
def visit_Name(self, node, frame):
if node.ctx == "store" and frame.toplevel:
if self._assign_stack:
self._assign_stack[-1].add(node.name)
ref = frame.symbols.ref(node.name)
# If we are looking up a variable we might have to deal with the
# case where it's undefined. We can skip that case if the load
# instruction indicates a parameter which are always defined.
if node.ctx == "load":
load = frame.symbols.find_load(ref)
if not (
load is not None
and load[0] == VAR_LOAD_PARAMETER
and not self.parameter_is_undeclared(ref)
):
self.write(
"(undefined(name=%r) if %s is missing else %s)"
% (node.name, ref, ref)
)
return
self.write(ref)
def visit_NSRef(self, node, frame):
# NSRefs can only be used to store values; since they use the normal
# `foo.bar` notation they will be parsed as a normal attribute access
# when used anywhere but in a `set` context
ref = frame.symbols.ref(node.name)
self.writeline("if not isinstance(%s, Namespace):" % ref)
self.indent()
self.writeline(
"raise TemplateRuntimeError(%r)"
% "cannot assign attribute on non-namespace object"
)
self.outdent()
self.writeline("%s[%r]" % (ref, node.attr))
def visit_Const(self, node, frame):
val = node.as_const(frame.eval_ctx)
if isinstance(val, float):
self.write(str(val))
else:
self.write(repr(val))
def visit_TemplateData(self, node, frame):
try:
self.write(repr(node.as_const(frame.eval_ctx)))
except nodes.Impossible:
self.write(
"(Markup if context.eval_ctx.autoescape else identity)(%r)" % node.data
)
def visit_Tuple(self, node, frame):
self.write("(")
idx = -1
for idx, item in enumerate(node.items):
if idx:
self.write(", ")
self.visit(item, frame)
self.write(idx == 0 and ",)" or ")")
def visit_List(self, node, frame):
self.write("[")
for idx, item in enumerate(node.items):
if idx:
self.write(", ")
self.visit(item, frame)
self.write("]")
def visit_Dict(self, node, frame):
self.write("{")
for idx, item in enumerate(node.items):
if idx:
self.write(", ")
self.visit(item.key, frame)
self.write(": ")
self.visit(item.value, frame)
self.write("}")
def binop(operator, interceptable=True): # noqa: B902
@optimizeconst
def visitor(self, node, frame):
if (
self.environment.sandboxed
and operator in self.environment.intercepted_binops
):
self.write("environment.call_binop(context, %r, " % operator)
self.visit(node.left, frame)
self.write(", ")
self.visit(node.right, frame)
else:
self.write("(")
self.visit(node.left, frame)
self.write(" %s " % operator)
self.visit(node.right, frame)
self.write(")")
return visitor
def uaop(operator, interceptable=True): # noqa: B902
@optimizeconst
def visitor(self, node, frame):
if (
self.environment.sandboxed
and operator in self.environment.intercepted_unops
):
self.write("environment.call_unop(context, %r, " % operator)
self.visit(node.node, frame)
else:
self.write("(" + operator)
self.visit(node.node, frame)
self.write(")")
return visitor
visit_Add = binop("+")
visit_Sub = binop("-")
visit_Mul = binop("*")
visit_Div = binop("/")
visit_FloorDiv = binop("//")
visit_Pow = binop("**")
visit_Mod = binop("%")
visit_And = binop("and", interceptable=False)
visit_Or = binop("or", interceptable=False)
visit_Pos = uaop("+")
visit_Neg = uaop("-")
visit_Not = uaop("not ", interceptable=False)
del binop, uaop
@optimizeconst
def visit_Concat(self, node, frame):
if frame.eval_ctx.volatile:
func_name = "(context.eval_ctx.volatile and markup_join or unicode_join)"
elif frame.eval_ctx.autoescape:
func_name = "markup_join"
else:
func_name = "unicode_join"
self.write("%s((" % func_name)
for arg in node.nodes:
self.visit(arg, frame)
self.write(", ")
self.write("))")
@optimizeconst
def visit_Compare(self, node, frame):
self.write("(")
self.visit(node.expr, frame)
for op in node.ops:
self.visit(op, frame)
self.write(")")
def visit_Operand(self, node, frame):
self.write(" %s " % operators[node.op])
self.visit(node.expr, frame)
@optimizeconst
def visit_Getattr(self, node, frame):
if self.environment.is_async:
self.write("(await auto_await(")
self.write("environment.getattr(")
self.visit(node.node, frame)
self.write(", %r)" % node.attr)
if self.environment.is_async:
self.write("))")
@optimizeconst
def visit_Getitem(self, node, frame):
# slices bypass the environment getitem method.
if isinstance(node.arg, nodes.Slice):
self.visit(node.node, frame)
self.write("[")
self.visit(node.arg, frame)
self.write("]")
else:
if self.environment.is_async:
self.write("(await auto_await(")
self.write("environment.getitem(")
self.visit(node.node, frame)
self.write(", ")
self.visit(node.arg, frame)
self.write(")")
if self.environment.is_async:
self.write("))")
def visit_Slice(self, node, frame):
if node.start is not None:
self.visit(node.start, frame)
self.write(":")
if node.stop is not None:
self.visit(node.stop, frame)
if node.step is not None:
self.write(":")
self.visit(node.step, frame)
@optimizeconst
def visit_Filter(self, node, frame):
if self.environment.is_async:
self.write("await auto_await(")
self.write(self.filters[node.name] + "(")
func = self.environment.filters.get(node.name)
if func is None:
self.fail("no filter named %r" % node.name, node.lineno)
if getattr(func, "contextfilter", False) is True:
self.write("context, ")
elif getattr(func, "evalcontextfilter", False) is True:
self.write("context.eval_ctx, ")
elif getattr(func, "environmentfilter", False) is True:
self.write("environment, ")
# if the filter node is None we are inside a filter block
# and want to write to the current buffer
if node.node is not None:
self.visit(node.node, frame)
elif frame.eval_ctx.volatile:
self.write(
"(context.eval_ctx.autoescape and"
" Markup(concat(%s)) or concat(%s))" % (frame.buffer, frame.buffer)
)
elif frame.eval_ctx.autoescape:
self.write("Markup(concat(%s))" % frame.buffer)
else:
self.write("concat(%s)" % frame.buffer)
self.signature(node, frame)
self.write(")")
if self.environment.is_async:
self.write(")")
@optimizeconst
def visit_Test(self, node, frame):
self.write(self.tests[node.name] + "(")
if node.name not in self.environment.tests:
self.fail("no test named %r" % node.name, node.lineno)
self.visit(node.node, frame)
self.signature(node, frame)
self.write(")")
@optimizeconst
def visit_CondExpr(self, node, frame):
def write_expr2():
if node.expr2 is not None:
return self.visit(node.expr2, frame)
self.write(
"cond_expr_undefined(%r)"
% (
"the inline if-"
"expression on %s evaluated to false and "
"no else section was defined." % self.position(node)
)
)
self.write("(")
self.visit(node.expr1, frame)
self.write(" if ")
self.visit(node.test, frame)
self.write(" else ")
write_expr2()
self.write(")")
@optimizeconst
def visit_Call(self, node, frame, forward_caller=False):
if self.environment.is_async:
self.write("await auto_await(")
if self.environment.sandboxed:
self.write("environment.call(context, ")
else:
self.write("context.call(")
self.visit(node.node, frame)
extra_kwargs = forward_caller and {"caller": "caller"} or None
self.signature(node, frame, extra_kwargs)
self.write(")")
if self.environment.is_async:
self.write(")")
def visit_Keyword(self, node, frame):
self.write(node.key + "=")
self.visit(node.value, frame)
# -- Unused nodes for extensions
def visit_MarkSafe(self, node, frame):
self.write("Markup(")
self.visit(node.expr, frame)
self.write(")")
def visit_MarkSafeIfAutoescape(self, node, frame):
self.write("(context.eval_ctx.autoescape and Markup or identity)(")
self.visit(node.expr, frame)
self.write(")")
def visit_EnvironmentAttribute(self, node, frame):
self.write("environment." + node.name)
def visit_ExtensionAttribute(self, node, frame):
self.write("environment.extensions[%r].%s" % (node.identifier, node.name))
def visit_ImportedName(self, node, frame):
self.write(self.import_aliases[node.importname])
def visit_InternalName(self, node, frame):
self.write(node.name)
def visit_ContextReference(self, node, frame):
self.write("context")
def visit_DerivedContextReference(self, node, frame):
self.write(self.derive_context(frame))
def visit_Continue(self, node, frame):
self.writeline("continue", node)
def visit_Break(self, node, frame):
self.writeline("break", node)
def visit_Scope(self, node, frame):
scope_frame = frame.inner()
scope_frame.symbols.analyze_node(node)
self.enter_frame(scope_frame)
self.blockvisit(node.body, scope_frame)
self.leave_frame(scope_frame)
def visit_OverlayScope(self, node, frame):
ctx = self.temporary_identifier()
self.writeline("%s = %s" % (ctx, self.derive_context(frame)))
self.writeline("%s.vars = " % ctx)
self.visit(node.context, frame)
self.push_context_reference(ctx)
scope_frame = frame.inner(isolated=True)
scope_frame.symbols.analyze_node(node)
self.enter_frame(scope_frame)
self.blockvisit(node.body, scope_frame)
self.leave_frame(scope_frame)
self.pop_context_reference()
def visit_EvalContextModifier(self, node, frame):
for keyword in node.options:
self.writeline("context.eval_ctx.%s = " % keyword.key)
self.visit(keyword.value, frame)
try:
val = keyword.value.as_const(frame.eval_ctx)
except nodes.Impossible:
frame.eval_ctx.volatile = True
else:
setattr(frame.eval_ctx, keyword.key, val)
def visit_ScopedEvalContextModifier(self, node, frame):
old_ctx_name = self.temporary_identifier()
saved_ctx = frame.eval_ctx.save()
self.writeline("%s = context.eval_ctx.save()" % old_ctx_name)
self.visit_EvalContextModifier(node, frame)
for child in node.body:
self.visit(child, frame)
frame.eval_ctx.revert(saved_ctx)
self.writeline("context.eval_ctx.revert(%s)" % old_ctx_name)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/constants.py
|
# -*- coding: utf-8 -*-
#: list of lorem ipsum words used by the lipsum() helper function
LOREM_IPSUM_WORDS = u"""\
a ac accumsan ad adipiscing aenean aliquam aliquet amet ante aptent arcu at
auctor augue bibendum blandit class commodo condimentum congue consectetuer
consequat conubia convallis cras cubilia cum curabitur curae cursus dapibus
diam dictum dictumst dignissim dis dolor donec dui duis egestas eget eleifend
elementum elit enim erat eros est et etiam eu euismod facilisi facilisis fames
faucibus felis fermentum feugiat fringilla fusce gravida habitant habitasse hac
hendrerit hymenaeos iaculis id imperdiet in inceptos integer interdum ipsum
justo lacinia lacus laoreet lectus leo libero ligula litora lobortis lorem
luctus maecenas magna magnis malesuada massa mattis mauris metus mi molestie
mollis montes morbi mus nam nascetur natoque nec neque netus nibh nisi nisl non
nonummy nostra nulla nullam nunc odio orci ornare parturient pede pellentesque
penatibus per pharetra phasellus placerat platea porta porttitor posuere
potenti praesent pretium primis proin pulvinar purus quam quis quisque rhoncus
ridiculus risus rutrum sagittis sapien scelerisque sed sem semper senectus sit
sociis sociosqu sodales sollicitudin suscipit suspendisse taciti tellus tempor
tempus tincidunt torquent tortor tristique turpis ullamcorper ultrices
ultricies urna ut varius vehicula vel velit venenatis vestibulum vitae vivamus
viverra volutpat vulputate"""
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/loaders.py
|
# -*- coding: utf-8 -*-
"""API and implementations for loading templates from different data
sources.
"""
import os
import sys
import weakref
from hashlib import sha1
from os import path
from types import ModuleType
from ._compat import abc
from ._compat import fspath
from ._compat import iteritems
from ._compat import string_types
from .exceptions import TemplateNotFound
from .utils import internalcode
from .utils import open_if_exists
def split_template_path(template):
"""Split a path into segments and perform a sanity check. If it detects
'..' in the path it will raise a `TemplateNotFound` error.
"""
pieces = []
for piece in template.split("/"):
if (
path.sep in piece
or (path.altsep and path.altsep in piece)
or piece == path.pardir
):
raise TemplateNotFound(template)
elif piece and piece != ".":
pieces.append(piece)
return pieces
class BaseLoader(object):
"""Baseclass for all loaders. Subclass this and override `get_source` to
implement a custom loading mechanism. The environment provides a
`get_template` method that calls the loader's `load` method to get the
:class:`Template` object.
A very basic example for a loader that looks up templates on the file
system could look like this::
from jinja2 import BaseLoader, TemplateNotFound
from os.path import join, exists, getmtime
class MyLoader(BaseLoader):
def __init__(self, path):
self.path = path
def get_source(self, environment, template):
path = join(self.path, template)
if not exists(path):
raise TemplateNotFound(template)
mtime = getmtime(path)
with file(path) as f:
source = f.read().decode('utf-8')
return source, path, lambda: mtime == getmtime(path)
"""
#: if set to `False` it indicates that the loader cannot provide access
#: to the source of templates.
#:
#: .. versionadded:: 2.4
has_source_access = True
def get_source(self, environment, template):
"""Get the template source, filename and reload helper for a template.
It's passed the environment and template name and has to return a
tuple in the form ``(source, filename, uptodate)`` or raise a
`TemplateNotFound` error if it can't locate the template.
The source part of the returned tuple must be the source of the
template as unicode string or a ASCII bytestring. The filename should
be the name of the file on the filesystem if it was loaded from there,
otherwise `None`. The filename is used by python for the tracebacks
if no loader extension is used.
The last item in the tuple is the `uptodate` function. If auto
reloading is enabled it's always called to check if the template
changed. No arguments are passed so the function must store the
old state somewhere (for example in a closure). If it returns `False`
the template will be reloaded.
"""
if not self.has_source_access:
raise RuntimeError(
"%s cannot provide access to the source" % self.__class__.__name__
)
raise TemplateNotFound(template)
def list_templates(self):
"""Iterates over all templates. If the loader does not support that
it should raise a :exc:`TypeError` which is the default behavior.
"""
raise TypeError("this loader cannot iterate over all templates")
@internalcode
def load(self, environment, name, globals=None):
"""Loads a template. This method looks up the template in the cache
or loads one by calling :meth:`get_source`. Subclasses should not
override this method as loaders working on collections of other
loaders (such as :class:`PrefixLoader` or :class:`ChoiceLoader`)
will not call this method but `get_source` directly.
"""
code = None
if globals is None:
globals = {}
# first we try to get the source for this template together
# with the filename and the uptodate function.
source, filename, uptodate = self.get_source(environment, name)
# try to load the code from the bytecode cache if there is a
# bytecode cache configured.
bcc = environment.bytecode_cache
if bcc is not None:
bucket = bcc.get_bucket(environment, name, filename, source)
code = bucket.code
# if we don't have code so far (not cached, no longer up to
# date) etc. we compile the template
if code is None:
code = environment.compile(source, name, filename)
# if the bytecode cache is available and the bucket doesn't
# have a code so far, we give the bucket the new code and put
# it back to the bytecode cache.
if bcc is not None and bucket.code is None:
bucket.code = code
bcc.set_bucket(bucket)
return environment.template_class.from_code(
environment, code, globals, uptodate
)
class FileSystemLoader(BaseLoader):
"""Loads templates from the file system. This loader can find templates
in folders on the file system and is the preferred way to load them.
The loader takes the path to the templates as string, or if multiple
locations are wanted a list of them which is then looked up in the
given order::
>>> loader = FileSystemLoader('/path/to/templates')
>>> loader = FileSystemLoader(['/path/to/templates', '/other/path'])
Per default the template encoding is ``'utf-8'`` which can be changed
by setting the `encoding` parameter to something else.
To follow symbolic links, set the *followlinks* parameter to ``True``::
>>> loader = FileSystemLoader('/path/to/templates', followlinks=True)
.. versionchanged:: 2.8
The ``followlinks`` parameter was added.
"""
def __init__(self, searchpath, encoding="utf-8", followlinks=False):
if not isinstance(searchpath, abc.Iterable) or isinstance(
searchpath, string_types
):
searchpath = [searchpath]
# In Python 3.5, os.path.join doesn't support Path. This can be
# simplified to list(searchpath) when Python 3.5 is dropped.
self.searchpath = [fspath(p) for p in searchpath]
self.encoding = encoding
self.followlinks = followlinks
def get_source(self, environment, template):
pieces = split_template_path(template)
for searchpath in self.searchpath:
filename = path.join(searchpath, *pieces)
f = open_if_exists(filename)
if f is None:
continue
try:
contents = f.read().decode(self.encoding)
finally:
f.close()
mtime = path.getmtime(filename)
def uptodate():
try:
return path.getmtime(filename) == mtime
except OSError:
return False
return contents, filename, uptodate
raise TemplateNotFound(template)
def list_templates(self):
found = set()
for searchpath in self.searchpath:
walk_dir = os.walk(searchpath, followlinks=self.followlinks)
for dirpath, _, filenames in walk_dir:
for filename in filenames:
template = (
os.path.join(dirpath, filename)[len(searchpath) :]
.strip(os.path.sep)
.replace(os.path.sep, "/")
)
if template[:2] == "./":
template = template[2:]
if template not in found:
found.add(template)
return sorted(found)
class PackageLoader(BaseLoader):
"""Load templates from python eggs or packages. It is constructed with
the name of the python package and the path to the templates in that
package::
loader = PackageLoader('mypackage', 'views')
If the package path is not given, ``'templates'`` is assumed.
Per default the template encoding is ``'utf-8'`` which can be changed
by setting the `encoding` parameter to something else. Due to the nature
of eggs it's only possible to reload templates if the package was loaded
from the file system and not a zip file.
"""
def __init__(self, package_name, package_path="templates", encoding="utf-8"):
from pkg_resources import DefaultProvider
from pkg_resources import get_provider
from pkg_resources import ResourceManager
provider = get_provider(package_name)
self.encoding = encoding
self.manager = ResourceManager()
self.filesystem_bound = isinstance(provider, DefaultProvider)
self.provider = provider
self.package_path = package_path
def get_source(self, environment, template):
pieces = split_template_path(template)
p = "/".join((self.package_path,) + tuple(pieces))
if not self.provider.has_resource(p):
raise TemplateNotFound(template)
filename = uptodate = None
if self.filesystem_bound:
filename = self.provider.get_resource_filename(self.manager, p)
mtime = path.getmtime(filename)
def uptodate():
try:
return path.getmtime(filename) == mtime
except OSError:
return False
source = self.provider.get_resource_string(self.manager, p)
return source.decode(self.encoding), filename, uptodate
def list_templates(self):
path = self.package_path
if path[:2] == "./":
path = path[2:]
elif path == ".":
path = ""
offset = len(path)
results = []
def _walk(path):
for filename in self.provider.resource_listdir(path):
fullname = path + "/" + filename
if self.provider.resource_isdir(fullname):
_walk(fullname)
else:
results.append(fullname[offset:].lstrip("/"))
_walk(path)
results.sort()
return results
class DictLoader(BaseLoader):
"""Loads a template from a python dict. It's passed a dict of unicode
strings bound to template names. This loader is useful for unittesting:
>>> loader = DictLoader({'index.html': 'source here'})
Because auto reloading is rarely useful this is disabled per default.
"""
def __init__(self, mapping):
self.mapping = mapping
def get_source(self, environment, template):
if template in self.mapping:
source = self.mapping[template]
return source, None, lambda: source == self.mapping.get(template)
raise TemplateNotFound(template)
def list_templates(self):
return sorted(self.mapping)
class FunctionLoader(BaseLoader):
"""A loader that is passed a function which does the loading. The
function receives the name of the template and has to return either
an unicode string with the template source, a tuple in the form ``(source,
filename, uptodatefunc)`` or `None` if the template does not exist.
>>> def load_template(name):
... if name == 'index.html':
... return '...'
...
>>> loader = FunctionLoader(load_template)
The `uptodatefunc` is a function that is called if autoreload is enabled
and has to return `True` if the template is still up to date. For more
details have a look at :meth:`BaseLoader.get_source` which has the same
return value.
"""
def __init__(self, load_func):
self.load_func = load_func
def get_source(self, environment, template):
rv = self.load_func(template)
if rv is None:
raise TemplateNotFound(template)
elif isinstance(rv, string_types):
return rv, None, None
return rv
class PrefixLoader(BaseLoader):
"""A loader that is passed a dict of loaders where each loader is bound
to a prefix. The prefix is delimited from the template by a slash per
default, which can be changed by setting the `delimiter` argument to
something else::
loader = PrefixLoader({
'app1': PackageLoader('mypackage.app1'),
'app2': PackageLoader('mypackage.app2')
})
By loading ``'app1/index.html'`` the file from the app1 package is loaded,
by loading ``'app2/index.html'`` the file from the second.
"""
def __init__(self, mapping, delimiter="/"):
self.mapping = mapping
self.delimiter = delimiter
def get_loader(self, template):
try:
prefix, name = template.split(self.delimiter, 1)
loader = self.mapping[prefix]
except (ValueError, KeyError):
raise TemplateNotFound(template)
return loader, name
def get_source(self, environment, template):
loader, name = self.get_loader(template)
try:
return loader.get_source(environment, name)
except TemplateNotFound:
# re-raise the exception with the correct filename here.
# (the one that includes the prefix)
raise TemplateNotFound(template)
@internalcode
def load(self, environment, name, globals=None):
loader, local_name = self.get_loader(name)
try:
return loader.load(environment, local_name, globals)
except TemplateNotFound:
# re-raise the exception with the correct filename here.
# (the one that includes the prefix)
raise TemplateNotFound(name)
def list_templates(self):
result = []
for prefix, loader in iteritems(self.mapping):
for template in loader.list_templates():
result.append(prefix + self.delimiter + template)
return result
class ChoiceLoader(BaseLoader):
"""This loader works like the `PrefixLoader` just that no prefix is
specified. If a template could not be found by one loader the next one
is tried.
>>> loader = ChoiceLoader([
... FileSystemLoader('/path/to/user/templates'),
... FileSystemLoader('/path/to/system/templates')
... ])
This is useful if you want to allow users to override builtin templates
from a different location.
"""
def __init__(self, loaders):
self.loaders = loaders
def get_source(self, environment, template):
for loader in self.loaders:
try:
return loader.get_source(environment, template)
except TemplateNotFound:
pass
raise TemplateNotFound(template)
@internalcode
def load(self, environment, name, globals=None):
for loader in self.loaders:
try:
return loader.load(environment, name, globals)
except TemplateNotFound:
pass
raise TemplateNotFound(name)
def list_templates(self):
found = set()
for loader in self.loaders:
found.update(loader.list_templates())
return sorted(found)
class _TemplateModule(ModuleType):
"""Like a normal module but with support for weak references"""
class ModuleLoader(BaseLoader):
"""This loader loads templates from precompiled templates.
Example usage:
>>> loader = ChoiceLoader([
... ModuleLoader('/path/to/compiled/templates'),
... FileSystemLoader('/path/to/templates')
... ])
Templates can be precompiled with :meth:`Environment.compile_templates`.
"""
has_source_access = False
def __init__(self, path):
package_name = "_jinja2_module_templates_%x" % id(self)
# create a fake module that looks for the templates in the
# path given.
mod = _TemplateModule(package_name)
if not isinstance(path, abc.Iterable) or isinstance(path, string_types):
path = [path]
mod.__path__ = [fspath(p) for p in path]
sys.modules[package_name] = weakref.proxy(
mod, lambda x: sys.modules.pop(package_name, None)
)
# the only strong reference, the sys.modules entry is weak
# so that the garbage collector can remove it once the
# loader that created it goes out of business.
self.module = mod
self.package_name = package_name
@staticmethod
def get_template_key(name):
return "tmpl_" + sha1(name.encode("utf-8")).hexdigest()
@staticmethod
def get_module_filename(name):
return ModuleLoader.get_template_key(name) + ".py"
@internalcode
def load(self, environment, name, globals=None):
key = self.get_template_key(name)
module = "%s.%s" % (self.package_name, key)
mod = getattr(self.module, module, None)
if mod is None:
try:
mod = __import__(module, None, None, ["root"])
except ImportError:
raise TemplateNotFound(name)
# remove the entry from sys.modules, we only want the attribute
# on the module object we have stored on the loader.
sys.modules.pop(module, None)
return environment.template_class.from_module_dict(
environment, mod.__dict__, globals
)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/__init__.py
|
# -*- coding: utf-8 -*-
"""Jinja is a template engine written in pure Python. It provides a
non-XML syntax that supports inline expressions and an optional
sandboxed environment.
"""
from markupsafe import escape
from markupsafe import Markup
from .bccache import BytecodeCache
from .bccache import FileSystemBytecodeCache
from .bccache import MemcachedBytecodeCache
from .environment import Environment
from .environment import Template
from .exceptions import TemplateAssertionError
from .exceptions import TemplateError
from .exceptions import TemplateNotFound
from .exceptions import TemplateRuntimeError
from .exceptions import TemplatesNotFound
from .exceptions import TemplateSyntaxError
from .exceptions import UndefinedError
from .filters import contextfilter
from .filters import environmentfilter
from .filters import evalcontextfilter
from .loaders import BaseLoader
from .loaders import ChoiceLoader
from .loaders import DictLoader
from .loaders import FileSystemLoader
from .loaders import FunctionLoader
from .loaders import ModuleLoader
from .loaders import PackageLoader
from .loaders import PrefixLoader
from .runtime import ChainableUndefined
from .runtime import DebugUndefined
from .runtime import make_logging_undefined
from .runtime import StrictUndefined
from .runtime import Undefined
from .utils import clear_caches
from .utils import contextfunction
from .utils import environmentfunction
from .utils import evalcontextfunction
from .utils import is_undefined
from .utils import select_autoescape
__version__ = "2.11.2"
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/idtracking.py
|
from ._compat import iteritems
from .visitor import NodeVisitor
VAR_LOAD_PARAMETER = "param"
VAR_LOAD_RESOLVE = "resolve"
VAR_LOAD_ALIAS = "alias"
VAR_LOAD_UNDEFINED = "undefined"
def find_symbols(nodes, parent_symbols=None):
sym = Symbols(parent=parent_symbols)
visitor = FrameSymbolVisitor(sym)
for node in nodes:
visitor.visit(node)
return sym
def symbols_for_node(node, parent_symbols=None):
sym = Symbols(parent=parent_symbols)
sym.analyze_node(node)
return sym
class Symbols(object):
def __init__(self, parent=None, level=None):
if level is None:
if parent is None:
level = 0
else:
level = parent.level + 1
self.level = level
self.parent = parent
self.refs = {}
self.loads = {}
self.stores = set()
def analyze_node(self, node, **kwargs):
visitor = RootVisitor(self)
visitor.visit(node, **kwargs)
def _define_ref(self, name, load=None):
ident = "l_%d_%s" % (self.level, name)
self.refs[name] = ident
if load is not None:
self.loads[ident] = load
return ident
def find_load(self, target):
if target in self.loads:
return self.loads[target]
if self.parent is not None:
return self.parent.find_load(target)
def find_ref(self, name):
if name in self.refs:
return self.refs[name]
if self.parent is not None:
return self.parent.find_ref(name)
def ref(self, name):
rv = self.find_ref(name)
if rv is None:
raise AssertionError(
"Tried to resolve a name to a reference that "
"was unknown to the frame (%r)" % name
)
return rv
def copy(self):
rv = object.__new__(self.__class__)
rv.__dict__.update(self.__dict__)
rv.refs = self.refs.copy()
rv.loads = self.loads.copy()
rv.stores = self.stores.copy()
return rv
def store(self, name):
self.stores.add(name)
# If we have not see the name referenced yet, we need to figure
# out what to set it to.
if name not in self.refs:
# If there is a parent scope we check if the name has a
# reference there. If it does it means we might have to alias
# to a variable there.
if self.parent is not None:
outer_ref = self.parent.find_ref(name)
if outer_ref is not None:
self._define_ref(name, load=(VAR_LOAD_ALIAS, outer_ref))
return
# Otherwise we can just set it to undefined.
self._define_ref(name, load=(VAR_LOAD_UNDEFINED, None))
def declare_parameter(self, name):
self.stores.add(name)
return self._define_ref(name, load=(VAR_LOAD_PARAMETER, None))
def load(self, name):
target = self.find_ref(name)
if target is None:
self._define_ref(name, load=(VAR_LOAD_RESOLVE, name))
def branch_update(self, branch_symbols):
stores = {}
for branch in branch_symbols:
for target in branch.stores:
if target in self.stores:
continue
stores[target] = stores.get(target, 0) + 1
for sym in branch_symbols:
self.refs.update(sym.refs)
self.loads.update(sym.loads)
self.stores.update(sym.stores)
for name, branch_count in iteritems(stores):
if branch_count == len(branch_symbols):
continue
target = self.find_ref(name)
assert target is not None, "should not happen"
if self.parent is not None:
outer_target = self.parent.find_ref(name)
if outer_target is not None:
self.loads[target] = (VAR_LOAD_ALIAS, outer_target)
continue
self.loads[target] = (VAR_LOAD_RESOLVE, name)
def dump_stores(self):
rv = {}
node = self
while node is not None:
for name in node.stores:
if name not in rv:
rv[name] = self.find_ref(name)
node = node.parent
return rv
def dump_param_targets(self):
rv = set()
node = self
while node is not None:
for target, (instr, _) in iteritems(self.loads):
if instr == VAR_LOAD_PARAMETER:
rv.add(target)
node = node.parent
return rv
class RootVisitor(NodeVisitor):
def __init__(self, symbols):
self.sym_visitor = FrameSymbolVisitor(symbols)
def _simple_visit(self, node, **kwargs):
for child in node.iter_child_nodes():
self.sym_visitor.visit(child)
visit_Template = (
visit_Block
) = (
visit_Macro
) = (
visit_FilterBlock
) = visit_Scope = visit_If = visit_ScopedEvalContextModifier = _simple_visit
def visit_AssignBlock(self, node, **kwargs):
for child in node.body:
self.sym_visitor.visit(child)
def visit_CallBlock(self, node, **kwargs):
for child in node.iter_child_nodes(exclude=("call",)):
self.sym_visitor.visit(child)
def visit_OverlayScope(self, node, **kwargs):
for child in node.body:
self.sym_visitor.visit(child)
def visit_For(self, node, for_branch="body", **kwargs):
if for_branch == "body":
self.sym_visitor.visit(node.target, store_as_param=True)
branch = node.body
elif for_branch == "else":
branch = node.else_
elif for_branch == "test":
self.sym_visitor.visit(node.target, store_as_param=True)
if node.test is not None:
self.sym_visitor.visit(node.test)
return
else:
raise RuntimeError("Unknown for branch")
for item in branch or ():
self.sym_visitor.visit(item)
def visit_With(self, node, **kwargs):
for target in node.targets:
self.sym_visitor.visit(target)
for child in node.body:
self.sym_visitor.visit(child)
def generic_visit(self, node, *args, **kwargs):
raise NotImplementedError(
"Cannot find symbols for %r" % node.__class__.__name__
)
class FrameSymbolVisitor(NodeVisitor):
"""A visitor for `Frame.inspect`."""
def __init__(self, symbols):
self.symbols = symbols
def visit_Name(self, node, store_as_param=False, **kwargs):
"""All assignments to names go through this function."""
if store_as_param or node.ctx == "param":
self.symbols.declare_parameter(node.name)
elif node.ctx == "store":
self.symbols.store(node.name)
elif node.ctx == "load":
self.symbols.load(node.name)
def visit_NSRef(self, node, **kwargs):
self.symbols.load(node.name)
def visit_If(self, node, **kwargs):
self.visit(node.test, **kwargs)
original_symbols = self.symbols
def inner_visit(nodes):
self.symbols = rv = original_symbols.copy()
for subnode in nodes:
self.visit(subnode, **kwargs)
self.symbols = original_symbols
return rv
body_symbols = inner_visit(node.body)
elif_symbols = inner_visit(node.elif_)
else_symbols = inner_visit(node.else_ or ())
self.symbols.branch_update([body_symbols, elif_symbols, else_symbols])
def visit_Macro(self, node, **kwargs):
self.symbols.store(node.name)
def visit_Import(self, node, **kwargs):
self.generic_visit(node, **kwargs)
self.symbols.store(node.target)
def visit_FromImport(self, node, **kwargs):
self.generic_visit(node, **kwargs)
for name in node.names:
if isinstance(name, tuple):
self.symbols.store(name[1])
else:
self.symbols.store(name)
def visit_Assign(self, node, **kwargs):
"""Visit assignments in the correct order."""
self.visit(node.node, **kwargs)
self.visit(node.target, **kwargs)
def visit_For(self, node, **kwargs):
"""Visiting stops at for blocks. However the block sequence
is visited as part of the outer scope.
"""
self.visit(node.iter, **kwargs)
def visit_CallBlock(self, node, **kwargs):
self.visit(node.call, **kwargs)
def visit_FilterBlock(self, node, **kwargs):
self.visit(node.filter, **kwargs)
def visit_With(self, node, **kwargs):
for target in node.values:
self.visit(target)
def visit_AssignBlock(self, node, **kwargs):
"""Stop visiting at block assigns."""
self.visit(node.target, **kwargs)
def visit_Scope(self, node, **kwargs):
"""Stop visiting at scopes."""
def visit_Block(self, node, **kwargs):
"""Stop visiting at blocks."""
def visit_OverlayScope(self, node, **kwargs):
"""Do not visit into overlay scopes."""
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/runtime.py
|
# -*- coding: utf-8 -*-
"""The runtime functions and state used by compiled templates."""
import sys
from itertools import chain
from types import MethodType
from markupsafe import escape # noqa: F401
from markupsafe import Markup
from markupsafe import soft_unicode
from ._compat import abc
from ._compat import imap
from ._compat import implements_iterator
from ._compat import implements_to_string
from ._compat import iteritems
from ._compat import PY2
from ._compat import string_types
from ._compat import text_type
from ._compat import with_metaclass
from .exceptions import TemplateNotFound # noqa: F401
from .exceptions import TemplateRuntimeError # noqa: F401
from .exceptions import UndefinedError
from .nodes import EvalContext
from .utils import concat
from .utils import evalcontextfunction
from .utils import internalcode
from .utils import missing
from .utils import Namespace # noqa: F401
from .utils import object_type_repr
# these variables are exported to the template runtime
exported = [
"LoopContext",
"TemplateReference",
"Macro",
"Markup",
"TemplateRuntimeError",
"missing",
"concat",
"escape",
"markup_join",
"unicode_join",
"to_string",
"identity",
"TemplateNotFound",
"Namespace",
"Undefined",
]
#: the name of the function that is used to convert something into
#: a string. We can just use the text type here.
to_string = text_type
def identity(x):
"""Returns its argument. Useful for certain things in the
environment.
"""
return x
def markup_join(seq):
"""Concatenation that escapes if necessary and converts to unicode."""
buf = []
iterator = imap(soft_unicode, seq)
for arg in iterator:
buf.append(arg)
if hasattr(arg, "__html__"):
return Markup(u"").join(chain(buf, iterator))
return concat(buf)
def unicode_join(seq):
"""Simple args to unicode conversion and concatenation."""
return concat(imap(text_type, seq))
def new_context(
environment,
template_name,
blocks,
vars=None,
shared=None,
globals=None,
locals=None,
):
"""Internal helper for context creation."""
if vars is None:
vars = {}
if shared:
parent = vars
else:
parent = dict(globals or (), **vars)
if locals:
# if the parent is shared a copy should be created because
# we don't want to modify the dict passed
if shared:
parent = dict(parent)
for key, value in iteritems(locals):
if value is not missing:
parent[key] = value
return environment.context_class(environment, parent, template_name, blocks)
class TemplateReference(object):
"""The `self` in templates."""
def __init__(self, context):
self.__context = context
def __getitem__(self, name):
blocks = self.__context.blocks[name]
return BlockReference(name, self.__context, blocks, 0)
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, self.__context.name)
def _get_func(x):
return getattr(x, "__func__", x)
class ContextMeta(type):
def __new__(mcs, name, bases, d):
rv = type.__new__(mcs, name, bases, d)
if bases == ():
return rv
resolve = _get_func(rv.resolve)
default_resolve = _get_func(Context.resolve)
resolve_or_missing = _get_func(rv.resolve_or_missing)
default_resolve_or_missing = _get_func(Context.resolve_or_missing)
# If we have a changed resolve but no changed default or missing
# resolve we invert the call logic.
if (
resolve is not default_resolve
and resolve_or_missing is default_resolve_or_missing
):
rv._legacy_resolve_mode = True
elif (
resolve is default_resolve
and resolve_or_missing is default_resolve_or_missing
):
rv._fast_resolve_mode = True
return rv
def resolve_or_missing(context, key, missing=missing):
if key in context.vars:
return context.vars[key]
if key in context.parent:
return context.parent[key]
return missing
class Context(with_metaclass(ContextMeta)):
"""The template context holds the variables of a template. It stores the
values passed to the template and also the names the template exports.
Creating instances is neither supported nor useful as it's created
automatically at various stages of the template evaluation and should not
be created by hand.
The context is immutable. Modifications on :attr:`parent` **must not**
happen and modifications on :attr:`vars` are allowed from generated
template code only. Template filters and global functions marked as
:func:`contextfunction`\\s get the active context passed as first argument
and are allowed to access the context read-only.
The template context supports read only dict operations (`get`,
`keys`, `values`, `items`, `iterkeys`, `itervalues`, `iteritems`,
`__getitem__`, `__contains__`). Additionally there is a :meth:`resolve`
method that doesn't fail with a `KeyError` but returns an
:class:`Undefined` object for missing variables.
"""
# XXX: we want to eventually make this be a deprecation warning and
# remove it.
_legacy_resolve_mode = False
_fast_resolve_mode = False
def __init__(self, environment, parent, name, blocks):
self.parent = parent
self.vars = {}
self.environment = environment
self.eval_ctx = EvalContext(self.environment, name)
self.exported_vars = set()
self.name = name
# create the initial mapping of blocks. Whenever template inheritance
# takes place the runtime will update this mapping with the new blocks
# from the template.
self.blocks = dict((k, [v]) for k, v in iteritems(blocks))
# In case we detect the fast resolve mode we can set up an alias
# here that bypasses the legacy code logic.
if self._fast_resolve_mode:
self.resolve_or_missing = MethodType(resolve_or_missing, self)
def super(self, name, current):
"""Render a parent block."""
try:
blocks = self.blocks[name]
index = blocks.index(current) + 1
blocks[index]
except LookupError:
return self.environment.undefined(
"there is no parent block called %r." % name, name="super"
)
return BlockReference(name, self, blocks, index)
def get(self, key, default=None):
"""Returns an item from the template context, if it doesn't exist
`default` is returned.
"""
try:
return self[key]
except KeyError:
return default
def resolve(self, key):
"""Looks up a variable like `__getitem__` or `get` but returns an
:class:`Undefined` object with the name of the name looked up.
"""
if self._legacy_resolve_mode:
rv = resolve_or_missing(self, key)
else:
rv = self.resolve_or_missing(key)
if rv is missing:
return self.environment.undefined(name=key)
return rv
def resolve_or_missing(self, key):
"""Resolves a variable like :meth:`resolve` but returns the
special `missing` value if it cannot be found.
"""
if self._legacy_resolve_mode:
rv = self.resolve(key)
if isinstance(rv, Undefined):
rv = missing
return rv
return resolve_or_missing(self, key)
def get_exported(self):
"""Get a new dict with the exported variables."""
return dict((k, self.vars[k]) for k in self.exported_vars)
def get_all(self):
"""Return the complete context as dict including the exported
variables. For optimizations reasons this might not return an
actual copy so be careful with using it.
"""
if not self.vars:
return self.parent
if not self.parent:
return self.vars
return dict(self.parent, **self.vars)
@internalcode
def call(__self, __obj, *args, **kwargs): # noqa: B902
"""Call the callable with the arguments and keyword arguments
provided but inject the active context or environment as first
argument if the callable is a :func:`contextfunction` or
:func:`environmentfunction`.
"""
if __debug__:
__traceback_hide__ = True # noqa
# Allow callable classes to take a context
if hasattr(__obj, "__call__"): # noqa: B004
fn = __obj.__call__
for fn_type in (
"contextfunction",
"evalcontextfunction",
"environmentfunction",
):
if hasattr(fn, fn_type):
__obj = fn
break
if callable(__obj):
if getattr(__obj, "contextfunction", False) is True:
args = (__self,) + args
elif getattr(__obj, "evalcontextfunction", False) is True:
args = (__self.eval_ctx,) + args
elif getattr(__obj, "environmentfunction", False) is True:
args = (__self.environment,) + args
try:
return __obj(*args, **kwargs)
except StopIteration:
return __self.environment.undefined(
"value was undefined because "
"a callable raised a "
"StopIteration exception"
)
def derived(self, locals=None):
"""Internal helper function to create a derived context. This is
used in situations where the system needs a new context in the same
template that is independent.
"""
context = new_context(
self.environment, self.name, {}, self.get_all(), True, None, locals
)
context.eval_ctx = self.eval_ctx
context.blocks.update((k, list(v)) for k, v in iteritems(self.blocks))
return context
def _all(meth): # noqa: B902
def proxy(self):
return getattr(self.get_all(), meth)()
proxy.__doc__ = getattr(dict, meth).__doc__
proxy.__name__ = meth
return proxy
keys = _all("keys")
values = _all("values")
items = _all("items")
# not available on python 3
if PY2:
iterkeys = _all("iterkeys")
itervalues = _all("itervalues")
iteritems = _all("iteritems")
del _all
def __contains__(self, name):
return name in self.vars or name in self.parent
def __getitem__(self, key):
"""Lookup a variable or raise `KeyError` if the variable is
undefined.
"""
item = self.resolve_or_missing(key)
if item is missing:
raise KeyError(key)
return item
def __repr__(self):
return "<%s %s of %r>" % (
self.__class__.__name__,
repr(self.get_all()),
self.name,
)
abc.Mapping.register(Context)
class BlockReference(object):
"""One block on a template reference."""
def __init__(self, name, context, stack, depth):
self.name = name
self._context = context
self._stack = stack
self._depth = depth
@property
def super(self):
"""Super the block."""
if self._depth + 1 >= len(self._stack):
return self._context.environment.undefined(
"there is no parent block called %r." % self.name, name="super"
)
return BlockReference(self.name, self._context, self._stack, self._depth + 1)
@internalcode
def __call__(self):
rv = concat(self._stack[self._depth](self._context))
if self._context.eval_ctx.autoescape:
rv = Markup(rv)
return rv
@implements_iterator
class LoopContext:
"""A wrapper iterable for dynamic ``for`` loops, with information
about the loop and iteration.
"""
#: Current iteration of the loop, starting at 0.
index0 = -1
_length = None
_after = missing
_current = missing
_before = missing
_last_changed_value = missing
def __init__(self, iterable, undefined, recurse=None, depth0=0):
"""
:param iterable: Iterable to wrap.
:param undefined: :class:`Undefined` class to use for next and
previous items.
:param recurse: The function to render the loop body when the
loop is marked recursive.
:param depth0: Incremented when looping recursively.
"""
self._iterable = iterable
self._iterator = self._to_iterator(iterable)
self._undefined = undefined
self._recurse = recurse
#: How many levels deep a recursive loop currently is, starting at 0.
self.depth0 = depth0
@staticmethod
def _to_iterator(iterable):
return iter(iterable)
@property
def length(self):
"""Length of the iterable.
If the iterable is a generator or otherwise does not have a
size, it is eagerly evaluated to get a size.
"""
if self._length is not None:
return self._length
try:
self._length = len(self._iterable)
except TypeError:
iterable = list(self._iterator)
self._iterator = self._to_iterator(iterable)
self._length = len(iterable) + self.index + (self._after is not missing)
return self._length
def __len__(self):
return self.length
@property
def depth(self):
"""How many levels deep a recursive loop currently is, starting at 1."""
return self.depth0 + 1
@property
def index(self):
"""Current iteration of the loop, starting at 1."""
return self.index0 + 1
@property
def revindex0(self):
"""Number of iterations from the end of the loop, ending at 0.
Requires calculating :attr:`length`.
"""
return self.length - self.index
@property
def revindex(self):
"""Number of iterations from the end of the loop, ending at 1.
Requires calculating :attr:`length`.
"""
return self.length - self.index0
@property
def first(self):
"""Whether this is the first iteration of the loop."""
return self.index0 == 0
def _peek_next(self):
"""Return the next element in the iterable, or :data:`missing`
if the iterable is exhausted. Only peeks one item ahead, caching
the result in :attr:`_last` for use in subsequent checks. The
cache is reset when :meth:`__next__` is called.
"""
if self._after is not missing:
return self._after
self._after = next(self._iterator, missing)
return self._after
@property
def last(self):
"""Whether this is the last iteration of the loop.
Causes the iterable to advance early. See
:func:`itertools.groupby` for issues this can cause.
The :func:`groupby` filter avoids that issue.
"""
return self._peek_next() is missing
@property
def previtem(self):
"""The item in the previous iteration. Undefined during the
first iteration.
"""
if self.first:
return self._undefined("there is no previous item")
return self._before
@property
def nextitem(self):
"""The item in the next iteration. Undefined during the last
iteration.
Causes the iterable to advance early. See
:func:`itertools.groupby` for issues this can cause.
The :func:`groupby` filter avoids that issue.
"""
rv = self._peek_next()
if rv is missing:
return self._undefined("there is no next item")
return rv
def cycle(self, *args):
"""Return a value from the given args, cycling through based on
the current :attr:`index0`.
:param args: One or more values to cycle through.
"""
if not args:
raise TypeError("no items for cycling given")
return args[self.index0 % len(args)]
def changed(self, *value):
"""Return ``True`` if previously called with a different value
(including when called for the first time).
:param value: One or more values to compare to the last call.
"""
if self._last_changed_value != value:
self._last_changed_value = value
return True
return False
def __iter__(self):
return self
def __next__(self):
if self._after is not missing:
rv = self._after
self._after = missing
else:
rv = next(self._iterator)
self.index0 += 1
self._before = self._current
self._current = rv
return rv, self
@internalcode
def __call__(self, iterable):
"""When iterating over nested data, render the body of the loop
recursively with the given inner iterable data.
The loop must have the ``recursive`` marker for this to work.
"""
if self._recurse is None:
raise TypeError(
"The loop must have the 'recursive' marker to be called recursively."
)
return self._recurse(iterable, self._recurse, depth=self.depth)
def __repr__(self):
return "<%s %d/%d>" % (self.__class__.__name__, self.index, self.length)
class Macro(object):
"""Wraps a macro function."""
def __init__(
self,
environment,
func,
name,
arguments,
catch_kwargs,
catch_varargs,
caller,
default_autoescape=None,
):
self._environment = environment
self._func = func
self._argument_count = len(arguments)
self.name = name
self.arguments = arguments
self.catch_kwargs = catch_kwargs
self.catch_varargs = catch_varargs
self.caller = caller
self.explicit_caller = "caller" in arguments
if default_autoescape is None:
default_autoescape = environment.autoescape
self._default_autoescape = default_autoescape
@internalcode
@evalcontextfunction
def __call__(self, *args, **kwargs):
# This requires a bit of explanation, In the past we used to
# decide largely based on compile-time information if a macro is
# safe or unsafe. While there was a volatile mode it was largely
# unused for deciding on escaping. This turns out to be
# problematic for macros because whether a macro is safe depends not
# on the escape mode when it was defined, but rather when it was used.
#
# Because however we export macros from the module system and
# there are historic callers that do not pass an eval context (and
# will continue to not pass one), we need to perform an instance
# check here.
#
# This is considered safe because an eval context is not a valid
# argument to callables otherwise anyway. Worst case here is
# that if no eval context is passed we fall back to the compile
# time autoescape flag.
if args and isinstance(args[0], EvalContext):
autoescape = args[0].autoescape
args = args[1:]
else:
autoescape = self._default_autoescape
# try to consume the positional arguments
arguments = list(args[: self._argument_count])
off = len(arguments)
# For information why this is necessary refer to the handling
# of caller in the `macro_body` handler in the compiler.
found_caller = False
# if the number of arguments consumed is not the number of
# arguments expected we start filling in keyword arguments
# and defaults.
if off != self._argument_count:
for name in self.arguments[len(arguments) :]:
try:
value = kwargs.pop(name)
except KeyError:
value = missing
if name == "caller":
found_caller = True
arguments.append(value)
else:
found_caller = self.explicit_caller
# it's important that the order of these arguments does not change
# if not also changed in the compiler's `function_scoping` method.
# the order is caller, keyword arguments, positional arguments!
if self.caller and not found_caller:
caller = kwargs.pop("caller", None)
if caller is None:
caller = self._environment.undefined("No caller defined", name="caller")
arguments.append(caller)
if self.catch_kwargs:
arguments.append(kwargs)
elif kwargs:
if "caller" in kwargs:
raise TypeError(
"macro %r was invoked with two values for "
"the special caller argument. This is "
"most likely a bug." % self.name
)
raise TypeError(
"macro %r takes no keyword argument %r"
% (self.name, next(iter(kwargs)))
)
if self.catch_varargs:
arguments.append(args[self._argument_count :])
elif len(args) > self._argument_count:
raise TypeError(
"macro %r takes not more than %d argument(s)"
% (self.name, len(self.arguments))
)
return self._invoke(arguments, autoescape)
def _invoke(self, arguments, autoescape):
"""This method is being swapped out by the async implementation."""
rv = self._func(*arguments)
if autoescape:
rv = Markup(rv)
return rv
def __repr__(self):
return "<%s %s>" % (
self.__class__.__name__,
self.name is None and "anonymous" or repr(self.name),
)
@implements_to_string
class Undefined(object):
"""The default undefined type. This undefined type can be printed and
iterated over, but every other access will raise an :exc:`UndefinedError`:
>>> foo = Undefined(name='foo')
>>> str(foo)
''
>>> not foo
True
>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
"""
__slots__ = (
"_undefined_hint",
"_undefined_obj",
"_undefined_name",
"_undefined_exception",
)
def __init__(self, hint=None, obj=missing, name=None, exc=UndefinedError):
self._undefined_hint = hint
self._undefined_obj = obj
self._undefined_name = name
self._undefined_exception = exc
@property
def _undefined_message(self):
"""Build a message about the undefined value based on how it was
accessed.
"""
if self._undefined_hint:
return self._undefined_hint
if self._undefined_obj is missing:
return "%r is undefined" % self._undefined_name
if not isinstance(self._undefined_name, string_types):
return "%s has no element %r" % (
object_type_repr(self._undefined_obj),
self._undefined_name,
)
return "%r has no attribute %r" % (
object_type_repr(self._undefined_obj),
self._undefined_name,
)
@internalcode
def _fail_with_undefined_error(self, *args, **kwargs):
"""Raise an :exc:`UndefinedError` when operations are performed
on the undefined value.
"""
raise self._undefined_exception(self._undefined_message)
@internalcode
def __getattr__(self, name):
if name[:2] == "__":
raise AttributeError(name)
return self._fail_with_undefined_error()
__add__ = (
__radd__
) = (
__mul__
) = (
__rmul__
) = (
__div__
) = (
__rdiv__
) = (
__truediv__
) = (
__rtruediv__
) = (
__floordiv__
) = (
__rfloordiv__
) = (
__mod__
) = (
__rmod__
) = (
__pos__
) = (
__neg__
) = (
__call__
) = (
__getitem__
) = (
__lt__
) = (
__le__
) = (
__gt__
) = (
__ge__
) = (
__int__
) = (
__float__
) = (
__complex__
) = __pow__ = __rpow__ = __sub__ = __rsub__ = _fail_with_undefined_error
def __eq__(self, other):
return type(self) is type(other)
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return id(type(self))
def __str__(self):
return u""
def __len__(self):
return 0
def __iter__(self):
if 0:
yield None
def __nonzero__(self):
return False
__bool__ = __nonzero__
def __repr__(self):
return "Undefined"
def make_logging_undefined(logger=None, base=None):
"""Given a logger object this returns a new undefined class that will
log certain failures. It will log iterations and printing. If no
logger is given a default logger is created.
Example::
logger = logging.getLogger(__name__)
LoggingUndefined = make_logging_undefined(
logger=logger,
base=Undefined
)
.. versionadded:: 2.8
:param logger: the logger to use. If not provided, a default logger
is created.
:param base: the base class to add logging functionality to. This
defaults to :class:`Undefined`.
"""
if logger is None:
import logging
logger = logging.getLogger(__name__)
logger.addHandler(logging.StreamHandler(sys.stderr))
if base is None:
base = Undefined
def _log_message(undef):
if undef._undefined_hint is None:
if undef._undefined_obj is missing:
hint = "%s is undefined" % undef._undefined_name
elif not isinstance(undef._undefined_name, string_types):
hint = "%s has no element %s" % (
object_type_repr(undef._undefined_obj),
undef._undefined_name,
)
else:
hint = "%s has no attribute %s" % (
object_type_repr(undef._undefined_obj),
undef._undefined_name,
)
else:
hint = undef._undefined_hint
logger.warning("Template variable warning: %s", hint)
class LoggingUndefined(base):
def _fail_with_undefined_error(self, *args, **kwargs):
try:
return base._fail_with_undefined_error(self, *args, **kwargs)
except self._undefined_exception as e:
logger.error("Template variable error: %s", str(e))
raise e
def __str__(self):
rv = base.__str__(self)
_log_message(self)
return rv
def __iter__(self):
rv = base.__iter__(self)
_log_message(self)
return rv
if PY2:
def __nonzero__(self):
rv = base.__nonzero__(self)
_log_message(self)
return rv
def __unicode__(self):
rv = base.__unicode__(self)
_log_message(self)
return rv
else:
def __bool__(self):
rv = base.__bool__(self)
_log_message(self)
return rv
return LoggingUndefined
# No @implements_to_string decorator here because __str__
# is not overwritten from Undefined in this class.
# This would cause a recursion error in Python 2.
class ChainableUndefined(Undefined):
"""An undefined that is chainable, where both ``__getattr__`` and
``__getitem__`` return itself rather than raising an
:exc:`UndefinedError`.
>>> foo = ChainableUndefined(name='foo')
>>> str(foo.bar['baz'])
''
>>> foo.bar['baz'] + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
.. versionadded:: 2.11.0
"""
__slots__ = ()
def __html__(self):
return self.__str__()
def __getattr__(self, _):
return self
__getitem__ = __getattr__
@implements_to_string
class DebugUndefined(Undefined):
"""An undefined that returns the debug info when printed.
>>> foo = DebugUndefined(name='foo')
>>> str(foo)
'{{ foo }}'
>>> not foo
True
>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
"""
__slots__ = ()
def __str__(self):
if self._undefined_hint is None:
if self._undefined_obj is missing:
return u"{{ %s }}" % self._undefined_name
return "{{ no such element: %s[%r] }}" % (
object_type_repr(self._undefined_obj),
self._undefined_name,
)
return u"{{ undefined value printed: %s }}" % self._undefined_hint
@implements_to_string
class StrictUndefined(Undefined):
"""An undefined that barks on print and iteration as well as boolean
tests and all kinds of comparisons. In other words: you can do nothing
with it except checking if it's defined using the `defined` test.
>>> foo = StrictUndefined(name='foo')
>>> str(foo)
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
>>> not foo
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
"""
__slots__ = ()
__iter__ = (
__str__
) = (
__len__
) = (
__nonzero__
) = __eq__ = __ne__ = __bool__ = __hash__ = Undefined._fail_with_undefined_error
# remove remaining slots attributes, after the metaclass did the magic they
# are unneeded and irritating as they contain wrong data for the subclasses.
del (
Undefined.__slots__,
ChainableUndefined.__slots__,
DebugUndefined.__slots__,
StrictUndefined.__slots__,
)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/parser.py
|
# -*- coding: utf-8 -*-
"""Parse tokens from the lexer into nodes for the compiler."""
from . import nodes
from ._compat import imap
from .exceptions import TemplateAssertionError
from .exceptions import TemplateSyntaxError
from .lexer import describe_token
from .lexer import describe_token_expr
_statement_keywords = frozenset(
[
"for",
"if",
"block",
"extends",
"print",
"macro",
"include",
"from",
"import",
"set",
"with",
"autoescape",
]
)
_compare_operators = frozenset(["eq", "ne", "lt", "lteq", "gt", "gteq"])
_math_nodes = {
"add": nodes.Add,
"sub": nodes.Sub,
"mul": nodes.Mul,
"div": nodes.Div,
"floordiv": nodes.FloorDiv,
"mod": nodes.Mod,
}
class Parser(object):
"""This is the central parsing class Jinja uses. It's passed to
extensions and can be used to parse expressions or statements.
"""
def __init__(self, environment, source, name=None, filename=None, state=None):
self.environment = environment
self.stream = environment._tokenize(source, name, filename, state)
self.name = name
self.filename = filename
self.closed = False
self.extensions = {}
for extension in environment.iter_extensions():
for tag in extension.tags:
self.extensions[tag] = extension.parse
self._last_identifier = 0
self._tag_stack = []
self._end_token_stack = []
def fail(self, msg, lineno=None, exc=TemplateSyntaxError):
"""Convenience method that raises `exc` with the message, passed
line number or last line number as well as the current name and
filename.
"""
if lineno is None:
lineno = self.stream.current.lineno
raise exc(msg, lineno, self.name, self.filename)
def _fail_ut_eof(self, name, end_token_stack, lineno):
expected = []
for exprs in end_token_stack:
expected.extend(imap(describe_token_expr, exprs))
if end_token_stack:
currently_looking = " or ".join(
"'%s'" % describe_token_expr(expr) for expr in end_token_stack[-1]
)
else:
currently_looking = None
if name is None:
message = ["Unexpected end of template."]
else:
message = ["Encountered unknown tag '%s'." % name]
if currently_looking:
if name is not None and name in expected:
message.append(
"You probably made a nesting mistake. Jinja "
"is expecting this tag, but currently looking "
"for %s." % currently_looking
)
else:
message.append(
"Jinja was looking for the following tags: "
"%s." % currently_looking
)
if self._tag_stack:
message.append(
"The innermost block that needs to be "
"closed is '%s'." % self._tag_stack[-1]
)
self.fail(" ".join(message), lineno)
def fail_unknown_tag(self, name, lineno=None):
"""Called if the parser encounters an unknown tag. Tries to fail
with a human readable error message that could help to identify
the problem.
"""
return self._fail_ut_eof(name, self._end_token_stack, lineno)
def fail_eof(self, end_tokens=None, lineno=None):
"""Like fail_unknown_tag but for end of template situations."""
stack = list(self._end_token_stack)
if end_tokens is not None:
stack.append(end_tokens)
return self._fail_ut_eof(None, stack, lineno)
def is_tuple_end(self, extra_end_rules=None):
"""Are we at the end of a tuple?"""
if self.stream.current.type in ("variable_end", "block_end", "rparen"):
return True
elif extra_end_rules is not None:
return self.stream.current.test_any(extra_end_rules)
return False
def free_identifier(self, lineno=None):
"""Return a new free identifier as :class:`~jinja2.nodes.InternalName`."""
self._last_identifier += 1
rv = object.__new__(nodes.InternalName)
nodes.Node.__init__(rv, "fi%d" % self._last_identifier, lineno=lineno)
return rv
def parse_statement(self):
"""Parse a single statement."""
token = self.stream.current
if token.type != "name":
self.fail("tag name expected", token.lineno)
self._tag_stack.append(token.value)
pop_tag = True
try:
if token.value in _statement_keywords:
return getattr(self, "parse_" + self.stream.current.value)()
if token.value == "call":
return self.parse_call_block()
if token.value == "filter":
return self.parse_filter_block()
ext = self.extensions.get(token.value)
if ext is not None:
return ext(self)
# did not work out, remove the token we pushed by accident
# from the stack so that the unknown tag fail function can
# produce a proper error message.
self._tag_stack.pop()
pop_tag = False
self.fail_unknown_tag(token.value, token.lineno)
finally:
if pop_tag:
self._tag_stack.pop()
def parse_statements(self, end_tokens, drop_needle=False):
"""Parse multiple statements into a list until one of the end tokens
is reached. This is used to parse the body of statements as it also
parses template data if appropriate. The parser checks first if the
current token is a colon and skips it if there is one. Then it checks
for the block end and parses until if one of the `end_tokens` is
reached. Per default the active token in the stream at the end of
the call is the matched end token. If this is not wanted `drop_needle`
can be set to `True` and the end token is removed.
"""
# the first token may be a colon for python compatibility
self.stream.skip_if("colon")
# in the future it would be possible to add whole code sections
# by adding some sort of end of statement token and parsing those here.
self.stream.expect("block_end")
result = self.subparse(end_tokens)
# we reached the end of the template too early, the subparser
# does not check for this, so we do that now
if self.stream.current.type == "eof":
self.fail_eof(end_tokens)
if drop_needle:
next(self.stream)
return result
def parse_set(self):
"""Parse an assign statement."""
lineno = next(self.stream).lineno
target = self.parse_assign_target(with_namespace=True)
if self.stream.skip_if("assign"):
expr = self.parse_tuple()
return nodes.Assign(target, expr, lineno=lineno)
filter_node = self.parse_filter(None)
body = self.parse_statements(("name:endset",), drop_needle=True)
return nodes.AssignBlock(target, filter_node, body, lineno=lineno)
def parse_for(self):
"""Parse a for loop."""
lineno = self.stream.expect("name:for").lineno
target = self.parse_assign_target(extra_end_rules=("name:in",))
self.stream.expect("name:in")
iter = self.parse_tuple(
with_condexpr=False, extra_end_rules=("name:recursive",)
)
test = None
if self.stream.skip_if("name:if"):
test = self.parse_expression()
recursive = self.stream.skip_if("name:recursive")
body = self.parse_statements(("name:endfor", "name:else"))
if next(self.stream).value == "endfor":
else_ = []
else:
else_ = self.parse_statements(("name:endfor",), drop_needle=True)
return nodes.For(target, iter, body, else_, test, recursive, lineno=lineno)
def parse_if(self):
"""Parse an if construct."""
node = result = nodes.If(lineno=self.stream.expect("name:if").lineno)
while 1:
node.test = self.parse_tuple(with_condexpr=False)
node.body = self.parse_statements(("name:elif", "name:else", "name:endif"))
node.elif_ = []
node.else_ = []
token = next(self.stream)
if token.test("name:elif"):
node = nodes.If(lineno=self.stream.current.lineno)
result.elif_.append(node)
continue
elif token.test("name:else"):
result.else_ = self.parse_statements(("name:endif",), drop_needle=True)
break
return result
def parse_with(self):
node = nodes.With(lineno=next(self.stream).lineno)
targets = []
values = []
while self.stream.current.type != "block_end":
if targets:
self.stream.expect("comma")
target = self.parse_assign_target()
target.set_ctx("param")
targets.append(target)
self.stream.expect("assign")
values.append(self.parse_expression())
node.targets = targets
node.values = values
node.body = self.parse_statements(("name:endwith",), drop_needle=True)
return node
def parse_autoescape(self):
node = nodes.ScopedEvalContextModifier(lineno=next(self.stream).lineno)
node.options = [nodes.Keyword("autoescape", self.parse_expression())]
node.body = self.parse_statements(("name:endautoescape",), drop_needle=True)
return nodes.Scope([node])
def parse_block(self):
node = nodes.Block(lineno=next(self.stream).lineno)
node.name = self.stream.expect("name").value
node.scoped = self.stream.skip_if("name:scoped")
# common problem people encounter when switching from django
# to jinja. we do not support hyphens in block names, so let's
# raise a nicer error message in that case.
if self.stream.current.type == "sub":
self.fail(
"Block names in Jinja have to be valid Python "
"identifiers and may not contain hyphens, use an "
"underscore instead."
)
node.body = self.parse_statements(("name:endblock",), drop_needle=True)
self.stream.skip_if("name:" + node.name)
return node
def parse_extends(self):
node = nodes.Extends(lineno=next(self.stream).lineno)
node.template = self.parse_expression()
return node
def parse_import_context(self, node, default):
if self.stream.current.test_any(
"name:with", "name:without"
) and self.stream.look().test("name:context"):
node.with_context = next(self.stream).value == "with"
self.stream.skip()
else:
node.with_context = default
return node
def parse_include(self):
node = nodes.Include(lineno=next(self.stream).lineno)
node.template = self.parse_expression()
if self.stream.current.test("name:ignore") and self.stream.look().test(
"name:missing"
):
node.ignore_missing = True
self.stream.skip(2)
else:
node.ignore_missing = False
return self.parse_import_context(node, True)
def parse_import(self):
node = nodes.Import(lineno=next(self.stream).lineno)
node.template = self.parse_expression()
self.stream.expect("name:as")
node.target = self.parse_assign_target(name_only=True).name
return self.parse_import_context(node, False)
def parse_from(self):
node = nodes.FromImport(lineno=next(self.stream).lineno)
node.template = self.parse_expression()
self.stream.expect("name:import")
node.names = []
def parse_context():
if self.stream.current.value in (
"with",
"without",
) and self.stream.look().test("name:context"):
node.with_context = next(self.stream).value == "with"
self.stream.skip()
return True
return False
while 1:
if node.names:
self.stream.expect("comma")
if self.stream.current.type == "name":
if parse_context():
break
target = self.parse_assign_target(name_only=True)
if target.name.startswith("_"):
self.fail(
"names starting with an underline can not be imported",
target.lineno,
exc=TemplateAssertionError,
)
if self.stream.skip_if("name:as"):
alias = self.parse_assign_target(name_only=True)
node.names.append((target.name, alias.name))
else:
node.names.append(target.name)
if parse_context() or self.stream.current.type != "comma":
break
else:
self.stream.expect("name")
if not hasattr(node, "with_context"):
node.with_context = False
return node
def parse_signature(self, node):
node.args = args = []
node.defaults = defaults = []
self.stream.expect("lparen")
while self.stream.current.type != "rparen":
if args:
self.stream.expect("comma")
arg = self.parse_assign_target(name_only=True)
arg.set_ctx("param")
if self.stream.skip_if("assign"):
defaults.append(self.parse_expression())
elif defaults:
self.fail("non-default argument follows default argument")
args.append(arg)
self.stream.expect("rparen")
def parse_call_block(self):
node = nodes.CallBlock(lineno=next(self.stream).lineno)
if self.stream.current.type == "lparen":
self.parse_signature(node)
else:
node.args = []
node.defaults = []
node.call = self.parse_expression()
if not isinstance(node.call, nodes.Call):
self.fail("expected call", node.lineno)
node.body = self.parse_statements(("name:endcall",), drop_needle=True)
return node
def parse_filter_block(self):
node = nodes.FilterBlock(lineno=next(self.stream).lineno)
node.filter = self.parse_filter(None, start_inline=True)
node.body = self.parse_statements(("name:endfilter",), drop_needle=True)
return node
def parse_macro(self):
node = nodes.Macro(lineno=next(self.stream).lineno)
node.name = self.parse_assign_target(name_only=True).name
self.parse_signature(node)
node.body = self.parse_statements(("name:endmacro",), drop_needle=True)
return node
def parse_print(self):
node = nodes.Output(lineno=next(self.stream).lineno)
node.nodes = []
while self.stream.current.type != "block_end":
if node.nodes:
self.stream.expect("comma")
node.nodes.append(self.parse_expression())
return node
def parse_assign_target(
self,
with_tuple=True,
name_only=False,
extra_end_rules=None,
with_namespace=False,
):
"""Parse an assignment target. As Jinja allows assignments to
tuples, this function can parse all allowed assignment targets. Per
default assignments to tuples are parsed, that can be disable however
by setting `with_tuple` to `False`. If only assignments to names are
wanted `name_only` can be set to `True`. The `extra_end_rules`
parameter is forwarded to the tuple parsing function. If
`with_namespace` is enabled, a namespace assignment may be parsed.
"""
if with_namespace and self.stream.look().type == "dot":
token = self.stream.expect("name")
next(self.stream) # dot
attr = self.stream.expect("name")
target = nodes.NSRef(token.value, attr.value, lineno=token.lineno)
elif name_only:
token = self.stream.expect("name")
target = nodes.Name(token.value, "store", lineno=token.lineno)
else:
if with_tuple:
target = self.parse_tuple(
simplified=True, extra_end_rules=extra_end_rules
)
else:
target = self.parse_primary()
target.set_ctx("store")
if not target.can_assign():
self.fail(
"can't assign to %r" % target.__class__.__name__.lower(), target.lineno
)
return target
def parse_expression(self, with_condexpr=True):
"""Parse an expression. Per default all expressions are parsed, if
the optional `with_condexpr` parameter is set to `False` conditional
expressions are not parsed.
"""
if with_condexpr:
return self.parse_condexpr()
return self.parse_or()
def parse_condexpr(self):
lineno = self.stream.current.lineno
expr1 = self.parse_or()
while self.stream.skip_if("name:if"):
expr2 = self.parse_or()
if self.stream.skip_if("name:else"):
expr3 = self.parse_condexpr()
else:
expr3 = None
expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno)
lineno = self.stream.current.lineno
return expr1
def parse_or(self):
lineno = self.stream.current.lineno
left = self.parse_and()
while self.stream.skip_if("name:or"):
right = self.parse_and()
left = nodes.Or(left, right, lineno=lineno)
lineno = self.stream.current.lineno
return left
def parse_and(self):
lineno = self.stream.current.lineno
left = self.parse_not()
while self.stream.skip_if("name:and"):
right = self.parse_not()
left = nodes.And(left, right, lineno=lineno)
lineno = self.stream.current.lineno
return left
def parse_not(self):
if self.stream.current.test("name:not"):
lineno = next(self.stream).lineno
return nodes.Not(self.parse_not(), lineno=lineno)
return self.parse_compare()
def parse_compare(self):
lineno = self.stream.current.lineno
expr = self.parse_math1()
ops = []
while 1:
token_type = self.stream.current.type
if token_type in _compare_operators:
next(self.stream)
ops.append(nodes.Operand(token_type, self.parse_math1()))
elif self.stream.skip_if("name:in"):
ops.append(nodes.Operand("in", self.parse_math1()))
elif self.stream.current.test("name:not") and self.stream.look().test(
"name:in"
):
self.stream.skip(2)
ops.append(nodes.Operand("notin", self.parse_math1()))
else:
break
lineno = self.stream.current.lineno
if not ops:
return expr
return nodes.Compare(expr, ops, lineno=lineno)
def parse_math1(self):
lineno = self.stream.current.lineno
left = self.parse_concat()
while self.stream.current.type in ("add", "sub"):
cls = _math_nodes[self.stream.current.type]
next(self.stream)
right = self.parse_concat()
left = cls(left, right, lineno=lineno)
lineno = self.stream.current.lineno
return left
def parse_concat(self):
lineno = self.stream.current.lineno
args = [self.parse_math2()]
while self.stream.current.type == "tilde":
next(self.stream)
args.append(self.parse_math2())
if len(args) == 1:
return args[0]
return nodes.Concat(args, lineno=lineno)
def parse_math2(self):
lineno = self.stream.current.lineno
left = self.parse_pow()
while self.stream.current.type in ("mul", "div", "floordiv", "mod"):
cls = _math_nodes[self.stream.current.type]
next(self.stream)
right = self.parse_pow()
left = cls(left, right, lineno=lineno)
lineno = self.stream.current.lineno
return left
def parse_pow(self):
lineno = self.stream.current.lineno
left = self.parse_unary()
while self.stream.current.type == "pow":
next(self.stream)
right = self.parse_unary()
left = nodes.Pow(left, right, lineno=lineno)
lineno = self.stream.current.lineno
return left
def parse_unary(self, with_filter=True):
token_type = self.stream.current.type
lineno = self.stream.current.lineno
if token_type == "sub":
next(self.stream)
node = nodes.Neg(self.parse_unary(False), lineno=lineno)
elif token_type == "add":
next(self.stream)
node = nodes.Pos(self.parse_unary(False), lineno=lineno)
else:
node = self.parse_primary()
node = self.parse_postfix(node)
if with_filter:
node = self.parse_filter_expr(node)
return node
def parse_primary(self):
token = self.stream.current
if token.type == "name":
if token.value in ("true", "false", "True", "False"):
node = nodes.Const(token.value in ("true", "True"), lineno=token.lineno)
elif token.value in ("none", "None"):
node = nodes.Const(None, lineno=token.lineno)
else:
node = nodes.Name(token.value, "load", lineno=token.lineno)
next(self.stream)
elif token.type == "string":
next(self.stream)
buf = [token.value]
lineno = token.lineno
while self.stream.current.type == "string":
buf.append(self.stream.current.value)
next(self.stream)
node = nodes.Const("".join(buf), lineno=lineno)
elif token.type in ("integer", "float"):
next(self.stream)
node = nodes.Const(token.value, lineno=token.lineno)
elif token.type == "lparen":
next(self.stream)
node = self.parse_tuple(explicit_parentheses=True)
self.stream.expect("rparen")
elif token.type == "lbracket":
node = self.parse_list()
elif token.type == "lbrace":
node = self.parse_dict()
else:
self.fail("unexpected '%s'" % describe_token(token), token.lineno)
return node
def parse_tuple(
self,
simplified=False,
with_condexpr=True,
extra_end_rules=None,
explicit_parentheses=False,
):
"""Works like `parse_expression` but if multiple expressions are
delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created.
This method could also return a regular expression instead of a tuple
if no commas where found.
The default parsing mode is a full tuple. If `simplified` is `True`
only names and literals are parsed. The `no_condexpr` parameter is
forwarded to :meth:`parse_expression`.
Because tuples do not require delimiters and may end in a bogus comma
an extra hint is needed that marks the end of a tuple. For example
for loops support tuples between `for` and `in`. In that case the
`extra_end_rules` is set to ``['name:in']``.
`explicit_parentheses` is true if the parsing was triggered by an
expression in parentheses. This is used to figure out if an empty
tuple is a valid expression or not.
"""
lineno = self.stream.current.lineno
if simplified:
parse = self.parse_primary
elif with_condexpr:
parse = self.parse_expression
else:
def parse():
return self.parse_expression(with_condexpr=False)
args = []
is_tuple = False
while 1:
if args:
self.stream.expect("comma")
if self.is_tuple_end(extra_end_rules):
break
args.append(parse())
if self.stream.current.type == "comma":
is_tuple = True
else:
break
lineno = self.stream.current.lineno
if not is_tuple:
if args:
return args[0]
# if we don't have explicit parentheses, an empty tuple is
# not a valid expression. This would mean nothing (literally
# nothing) in the spot of an expression would be an empty
# tuple.
if not explicit_parentheses:
self.fail(
"Expected an expression, got '%s'"
% describe_token(self.stream.current)
)
return nodes.Tuple(args, "load", lineno=lineno)
def parse_list(self):
token = self.stream.expect("lbracket")
items = []
while self.stream.current.type != "rbracket":
if items:
self.stream.expect("comma")
if self.stream.current.type == "rbracket":
break
items.append(self.parse_expression())
self.stream.expect("rbracket")
return nodes.List(items, lineno=token.lineno)
def parse_dict(self):
token = self.stream.expect("lbrace")
items = []
while self.stream.current.type != "rbrace":
if items:
self.stream.expect("comma")
if self.stream.current.type == "rbrace":
break
key = self.parse_expression()
self.stream.expect("colon")
value = self.parse_expression()
items.append(nodes.Pair(key, value, lineno=key.lineno))
self.stream.expect("rbrace")
return nodes.Dict(items, lineno=token.lineno)
def parse_postfix(self, node):
while 1:
token_type = self.stream.current.type
if token_type == "dot" or token_type == "lbracket":
node = self.parse_subscript(node)
# calls are valid both after postfix expressions (getattr
# and getitem) as well as filters and tests
elif token_type == "lparen":
node = self.parse_call(node)
else:
break
return node
def parse_filter_expr(self, node):
while 1:
token_type = self.stream.current.type
if token_type == "pipe":
node = self.parse_filter(node)
elif token_type == "name" and self.stream.current.value == "is":
node = self.parse_test(node)
# calls are valid both after postfix expressions (getattr
# and getitem) as well as filters and tests
elif token_type == "lparen":
node = self.parse_call(node)
else:
break
return node
def parse_subscript(self, node):
token = next(self.stream)
if token.type == "dot":
attr_token = self.stream.current
next(self.stream)
if attr_token.type == "name":
return nodes.Getattr(
node, attr_token.value, "load", lineno=token.lineno
)
elif attr_token.type != "integer":
self.fail("expected name or number", attr_token.lineno)
arg = nodes.Const(attr_token.value, lineno=attr_token.lineno)
return nodes.Getitem(node, arg, "load", lineno=token.lineno)
if token.type == "lbracket":
args = []
while self.stream.current.type != "rbracket":
if args:
self.stream.expect("comma")
args.append(self.parse_subscribed())
self.stream.expect("rbracket")
if len(args) == 1:
arg = args[0]
else:
arg = nodes.Tuple(args, "load", lineno=token.lineno)
return nodes.Getitem(node, arg, "load", lineno=token.lineno)
self.fail("expected subscript expression", token.lineno)
def parse_subscribed(self):
lineno = self.stream.current.lineno
if self.stream.current.type == "colon":
next(self.stream)
args = [None]
else:
node = self.parse_expression()
if self.stream.current.type != "colon":
return node
next(self.stream)
args = [node]
if self.stream.current.type == "colon":
args.append(None)
elif self.stream.current.type not in ("rbracket", "comma"):
args.append(self.parse_expression())
else:
args.append(None)
if self.stream.current.type == "colon":
next(self.stream)
if self.stream.current.type not in ("rbracket", "comma"):
args.append(self.parse_expression())
else:
args.append(None)
else:
args.append(None)
return nodes.Slice(lineno=lineno, *args)
def parse_call(self, node):
token = self.stream.expect("lparen")
args = []
kwargs = []
dyn_args = dyn_kwargs = None
require_comma = False
def ensure(expr):
if not expr:
self.fail("invalid syntax for function call expression", token.lineno)
while self.stream.current.type != "rparen":
if require_comma:
self.stream.expect("comma")
# support for trailing comma
if self.stream.current.type == "rparen":
break
if self.stream.current.type == "mul":
ensure(dyn_args is None and dyn_kwargs is None)
next(self.stream)
dyn_args = self.parse_expression()
elif self.stream.current.type == "pow":
ensure(dyn_kwargs is None)
next(self.stream)
dyn_kwargs = self.parse_expression()
else:
if (
self.stream.current.type == "name"
and self.stream.look().type == "assign"
):
# Parsing a kwarg
ensure(dyn_kwargs is None)
key = self.stream.current.value
self.stream.skip(2)
value = self.parse_expression()
kwargs.append(nodes.Keyword(key, value, lineno=value.lineno))
else:
# Parsing an arg
ensure(dyn_args is None and dyn_kwargs is None and not kwargs)
args.append(self.parse_expression())
require_comma = True
self.stream.expect("rparen")
if node is None:
return args, kwargs, dyn_args, dyn_kwargs
return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno)
def parse_filter(self, node, start_inline=False):
while self.stream.current.type == "pipe" or start_inline:
if not start_inline:
next(self.stream)
token = self.stream.expect("name")
name = token.value
while self.stream.current.type == "dot":
next(self.stream)
name += "." + self.stream.expect("name").value
if self.stream.current.type == "lparen":
args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
else:
args = []
kwargs = []
dyn_args = dyn_kwargs = None
node = nodes.Filter(
node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
)
start_inline = False
return node
def parse_test(self, node):
token = next(self.stream)
if self.stream.current.test("name:not"):
next(self.stream)
negated = True
else:
negated = False
name = self.stream.expect("name").value
while self.stream.current.type == "dot":
next(self.stream)
name += "." + self.stream.expect("name").value
dyn_args = dyn_kwargs = None
kwargs = []
if self.stream.current.type == "lparen":
args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
elif self.stream.current.type in (
"name",
"string",
"integer",
"float",
"lparen",
"lbracket",
"lbrace",
) and not self.stream.current.test_any("name:else", "name:or", "name:and"):
if self.stream.current.test("name:is"):
self.fail("You cannot chain multiple tests with is")
arg_node = self.parse_primary()
arg_node = self.parse_postfix(arg_node)
args = [arg_node]
else:
args = []
node = nodes.Test(
node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
)
if negated:
node = nodes.Not(node, lineno=token.lineno)
return node
def subparse(self, end_tokens=None):
body = []
data_buffer = []
add_data = data_buffer.append
if end_tokens is not None:
self._end_token_stack.append(end_tokens)
def flush_data():
if data_buffer:
lineno = data_buffer[0].lineno
body.append(nodes.Output(data_buffer[:], lineno=lineno))
del data_buffer[:]
try:
while self.stream:
token = self.stream.current
if token.type == "data":
if token.value:
add_data(nodes.TemplateData(token.value, lineno=token.lineno))
next(self.stream)
elif token.type == "variable_begin":
next(self.stream)
add_data(self.parse_tuple(with_condexpr=True))
self.stream.expect("variable_end")
elif token.type == "block_begin":
flush_data()
next(self.stream)
if end_tokens is not None and self.stream.current.test_any(
*end_tokens
):
return body
rv = self.parse_statement()
if isinstance(rv, list):
body.extend(rv)
else:
body.append(rv)
self.stream.expect("block_end")
else:
raise AssertionError("internal parsing error")
flush_data()
finally:
if end_tokens is not None:
self._end_token_stack.pop()
return body
def parse(self):
"""Parse the whole template into a `Template` node."""
result = nodes.Template(self.subparse(), lineno=1)
result.set_environment(self.environment)
return result
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/sandbox.py
|
# -*- coding: utf-8 -*-
"""A sandbox layer that ensures unsafe operations cannot be performed.
Useful when the template itself comes from an untrusted source.
"""
import operator
import types
import warnings
from collections import deque
from string import Formatter
from markupsafe import EscapeFormatter
from markupsafe import Markup
from ._compat import abc
from ._compat import PY2
from ._compat import range_type
from ._compat import string_types
from .environment import Environment
from .exceptions import SecurityError
#: maximum number of items a range may produce
MAX_RANGE = 100000
#: attributes of function objects that are considered unsafe.
if PY2:
UNSAFE_FUNCTION_ATTRIBUTES = {
"func_closure",
"func_code",
"func_dict",
"func_defaults",
"func_globals",
}
else:
# On versions > python 2 the special attributes on functions are gone,
# but they remain on methods and generators for whatever reason.
UNSAFE_FUNCTION_ATTRIBUTES = set()
#: unsafe method attributes. function attributes are unsafe for methods too
UNSAFE_METHOD_ATTRIBUTES = {"im_class", "im_func", "im_self"}
#: unsafe generator attributes.
UNSAFE_GENERATOR_ATTRIBUTES = {"gi_frame", "gi_code"}
#: unsafe attributes on coroutines
UNSAFE_COROUTINE_ATTRIBUTES = {"cr_frame", "cr_code"}
#: unsafe attributes on async generators
UNSAFE_ASYNC_GENERATOR_ATTRIBUTES = {"ag_code", "ag_frame"}
# make sure we don't warn in python 2.6 about stuff we don't care about
warnings.filterwarnings(
"ignore", "the sets module", DeprecationWarning, module=__name__
)
_mutable_set_types = (set,)
_mutable_mapping_types = (dict,)
_mutable_sequence_types = (list,)
# on python 2.x we can register the user collection types
try:
from UserDict import UserDict, DictMixin
from UserList import UserList
_mutable_mapping_types += (UserDict, DictMixin)
_mutable_set_types += (UserList,)
except ImportError:
pass
# if sets is still available, register the mutable set from there as well
try:
from sets import Set
_mutable_set_types += (Set,)
except ImportError:
pass
#: register Python 2.6 abstract base classes
_mutable_set_types += (abc.MutableSet,)
_mutable_mapping_types += (abc.MutableMapping,)
_mutable_sequence_types += (abc.MutableSequence,)
_mutable_spec = (
(
_mutable_set_types,
frozenset(
[
"add",
"clear",
"difference_update",
"discard",
"pop",
"remove",
"symmetric_difference_update",
"update",
]
),
),
(
_mutable_mapping_types,
frozenset(["clear", "pop", "popitem", "setdefault", "update"]),
),
(
_mutable_sequence_types,
frozenset(["append", "reverse", "insert", "sort", "extend", "remove"]),
),
(
deque,
frozenset(
[
"append",
"appendleft",
"clear",
"extend",
"extendleft",
"pop",
"popleft",
"remove",
"rotate",
]
),
),
)
class _MagicFormatMapping(abc.Mapping):
"""This class implements a dummy wrapper to fix a bug in the Python
standard library for string formatting.
See https://bugs.python.org/issue13598 for information about why
this is necessary.
"""
def __init__(self, args, kwargs):
self._args = args
self._kwargs = kwargs
self._last_index = 0
def __getitem__(self, key):
if key == "":
idx = self._last_index
self._last_index += 1
try:
return self._args[idx]
except LookupError:
pass
key = str(idx)
return self._kwargs[key]
def __iter__(self):
return iter(self._kwargs)
def __len__(self):
return len(self._kwargs)
def inspect_format_method(callable):
if not isinstance(
callable, (types.MethodType, types.BuiltinMethodType)
) or callable.__name__ not in ("format", "format_map"):
return None
obj = callable.__self__
if isinstance(obj, string_types):
return obj
def safe_range(*args):
"""A range that can't generate ranges with a length of more than
MAX_RANGE items.
"""
rng = range_type(*args)
if len(rng) > MAX_RANGE:
raise OverflowError(
"Range too big. The sandbox blocks ranges larger than"
" MAX_RANGE (%d)." % MAX_RANGE
)
return rng
def unsafe(f):
"""Marks a function or method as unsafe.
::
@unsafe
def delete(self):
pass
"""
f.unsafe_callable = True
return f
def is_internal_attribute(obj, attr):
"""Test if the attribute given is an internal python attribute. For
example this function returns `True` for the `func_code` attribute of
python objects. This is useful if the environment method
:meth:`~SandboxedEnvironment.is_safe_attribute` is overridden.
>>> from jinja2.sandbox import is_internal_attribute
>>> is_internal_attribute(str, "mro")
True
>>> is_internal_attribute(str, "upper")
False
"""
if isinstance(obj, types.FunctionType):
if attr in UNSAFE_FUNCTION_ATTRIBUTES:
return True
elif isinstance(obj, types.MethodType):
if attr in UNSAFE_FUNCTION_ATTRIBUTES or attr in UNSAFE_METHOD_ATTRIBUTES:
return True
elif isinstance(obj, type):
if attr == "mro":
return True
elif isinstance(obj, (types.CodeType, types.TracebackType, types.FrameType)):
return True
elif isinstance(obj, types.GeneratorType):
if attr in UNSAFE_GENERATOR_ATTRIBUTES:
return True
elif hasattr(types, "CoroutineType") and isinstance(obj, types.CoroutineType):
if attr in UNSAFE_COROUTINE_ATTRIBUTES:
return True
elif hasattr(types, "AsyncGeneratorType") and isinstance(
obj, types.AsyncGeneratorType
):
if attr in UNSAFE_ASYNC_GENERATOR_ATTRIBUTES:
return True
return attr.startswith("__")
def modifies_known_mutable(obj, attr):
"""This function checks if an attribute on a builtin mutable object
(list, dict, set or deque) would modify it if called. It also supports
the "user"-versions of the objects (`sets.Set`, `UserDict.*` etc.) and
with Python 2.6 onwards the abstract base classes `MutableSet`,
`MutableMapping`, and `MutableSequence`.
>>> modifies_known_mutable({}, "clear")
True
>>> modifies_known_mutable({}, "keys")
False
>>> modifies_known_mutable([], "append")
True
>>> modifies_known_mutable([], "index")
False
If called with an unsupported object (such as unicode) `False` is
returned.
>>> modifies_known_mutable("foo", "upper")
False
"""
for typespec, unsafe in _mutable_spec:
if isinstance(obj, typespec):
return attr in unsafe
return False
class SandboxedEnvironment(Environment):
"""The sandboxed environment. It works like the regular environment but
tells the compiler to generate sandboxed code. Additionally subclasses of
this environment may override the methods that tell the runtime what
attributes or functions are safe to access.
If the template tries to access insecure code a :exc:`SecurityError` is
raised. However also other exceptions may occur during the rendering so
the caller has to ensure that all exceptions are caught.
"""
sandboxed = True
#: default callback table for the binary operators. A copy of this is
#: available on each instance of a sandboxed environment as
#: :attr:`binop_table`
default_binop_table = {
"+": operator.add,
"-": operator.sub,
"*": operator.mul,
"/": operator.truediv,
"//": operator.floordiv,
"**": operator.pow,
"%": operator.mod,
}
#: default callback table for the unary operators. A copy of this is
#: available on each instance of a sandboxed environment as
#: :attr:`unop_table`
default_unop_table = {"+": operator.pos, "-": operator.neg}
#: a set of binary operators that should be intercepted. Each operator
#: that is added to this set (empty by default) is delegated to the
#: :meth:`call_binop` method that will perform the operator. The default
#: operator callback is specified by :attr:`binop_table`.
#:
#: The following binary operators are interceptable:
#: ``//``, ``%``, ``+``, ``*``, ``-``, ``/``, and ``**``
#:
#: The default operation form the operator table corresponds to the
#: builtin function. Intercepted calls are always slower than the native
#: operator call, so make sure only to intercept the ones you are
#: interested in.
#:
#: .. versionadded:: 2.6
intercepted_binops = frozenset()
#: a set of unary operators that should be intercepted. Each operator
#: that is added to this set (empty by default) is delegated to the
#: :meth:`call_unop` method that will perform the operator. The default
#: operator callback is specified by :attr:`unop_table`.
#:
#: The following unary operators are interceptable: ``+``, ``-``
#:
#: The default operation form the operator table corresponds to the
#: builtin function. Intercepted calls are always slower than the native
#: operator call, so make sure only to intercept the ones you are
#: interested in.
#:
#: .. versionadded:: 2.6
intercepted_unops = frozenset()
def intercept_unop(self, operator):
"""Called during template compilation with the name of a unary
operator to check if it should be intercepted at runtime. If this
method returns `True`, :meth:`call_unop` is executed for this unary
operator. The default implementation of :meth:`call_unop` will use
the :attr:`unop_table` dictionary to perform the operator with the
same logic as the builtin one.
The following unary operators are interceptable: ``+`` and ``-``
Intercepted calls are always slower than the native operator call,
so make sure only to intercept the ones you are interested in.
.. versionadded:: 2.6
"""
return False
def __init__(self, *args, **kwargs):
Environment.__init__(self, *args, **kwargs)
self.globals["range"] = safe_range
self.binop_table = self.default_binop_table.copy()
self.unop_table = self.default_unop_table.copy()
def is_safe_attribute(self, obj, attr, value):
"""The sandboxed environment will call this method to check if the
attribute of an object is safe to access. Per default all attributes
starting with an underscore are considered private as well as the
special attributes of internal python objects as returned by the
:func:`is_internal_attribute` function.
"""
return not (attr.startswith("_") or is_internal_attribute(obj, attr))
def is_safe_callable(self, obj):
"""Check if an object is safely callable. Per default a function is
considered safe unless the `unsafe_callable` attribute exists and is
True. Override this method to alter the behavior, but this won't
affect the `unsafe` decorator from this module.
"""
return not (
getattr(obj, "unsafe_callable", False) or getattr(obj, "alters_data", False)
)
def call_binop(self, context, operator, left, right):
"""For intercepted binary operator calls (:meth:`intercepted_binops`)
this function is executed instead of the builtin operator. This can
be used to fine tune the behavior of certain operators.
.. versionadded:: 2.6
"""
return self.binop_table[operator](left, right)
def call_unop(self, context, operator, arg):
"""For intercepted unary operator calls (:meth:`intercepted_unops`)
this function is executed instead of the builtin operator. This can
be used to fine tune the behavior of certain operators.
.. versionadded:: 2.6
"""
return self.unop_table[operator](arg)
def getitem(self, obj, argument):
"""Subscribe an object from sandboxed code."""
try:
return obj[argument]
except (TypeError, LookupError):
if isinstance(argument, string_types):
try:
attr = str(argument)
except Exception:
pass
else:
try:
value = getattr(obj, attr)
except AttributeError:
pass
else:
if self.is_safe_attribute(obj, argument, value):
return value
return self.unsafe_undefined(obj, argument)
return self.undefined(obj=obj, name=argument)
def getattr(self, obj, attribute):
"""Subscribe an object from sandboxed code and prefer the
attribute. The attribute passed *must* be a bytestring.
"""
try:
value = getattr(obj, attribute)
except AttributeError:
try:
return obj[attribute]
except (TypeError, LookupError):
pass
else:
if self.is_safe_attribute(obj, attribute, value):
return value
return self.unsafe_undefined(obj, attribute)
return self.undefined(obj=obj, name=attribute)
def unsafe_undefined(self, obj, attribute):
"""Return an undefined object for unsafe attributes."""
return self.undefined(
"access to attribute %r of %r "
"object is unsafe." % (attribute, obj.__class__.__name__),
name=attribute,
obj=obj,
exc=SecurityError,
)
def format_string(self, s, args, kwargs, format_func=None):
"""If a format call is detected, then this is routed through this
method so that our safety sandbox can be used for it.
"""
if isinstance(s, Markup):
formatter = SandboxedEscapeFormatter(self, s.escape)
else:
formatter = SandboxedFormatter(self)
if format_func is not None and format_func.__name__ == "format_map":
if len(args) != 1 or kwargs:
raise TypeError(
"format_map() takes exactly one argument %d given"
% (len(args) + (kwargs is not None))
)
kwargs = args[0]
args = None
kwargs = _MagicFormatMapping(args, kwargs)
rv = formatter.vformat(s, args, kwargs)
return type(s)(rv)
def call(__self, __context, __obj, *args, **kwargs): # noqa: B902
"""Call an object from sandboxed code."""
fmt = inspect_format_method(__obj)
if fmt is not None:
return __self.format_string(fmt, args, kwargs, __obj)
# the double prefixes are to avoid double keyword argument
# errors when proxying the call.
if not __self.is_safe_callable(__obj):
raise SecurityError("%r is not safely callable" % (__obj,))
return __context.call(__obj, *args, **kwargs)
class ImmutableSandboxedEnvironment(SandboxedEnvironment):
"""Works exactly like the regular `SandboxedEnvironment` but does not
permit modifications on the builtin mutable objects `list`, `set`, and
`dict` by using the :func:`modifies_known_mutable` function.
"""
def is_safe_attribute(self, obj, attr, value):
if not SandboxedEnvironment.is_safe_attribute(self, obj, attr, value):
return False
return not modifies_known_mutable(obj, attr)
# This really is not a public API apparently.
try:
from _string import formatter_field_name_split
except ImportError:
def formatter_field_name_split(field_name):
return field_name._formatter_field_name_split()
class SandboxedFormatterMixin(object):
def __init__(self, env):
self._env = env
def get_field(self, field_name, args, kwargs):
first, rest = formatter_field_name_split(field_name)
obj = self.get_value(first, args, kwargs)
for is_attr, i in rest:
if is_attr:
obj = self._env.getattr(obj, i)
else:
obj = self._env.getitem(obj, i)
return obj, first
class SandboxedFormatter(SandboxedFormatterMixin, Formatter):
def __init__(self, env):
SandboxedFormatterMixin.__init__(self, env)
Formatter.__init__(self)
class SandboxedEscapeFormatter(SandboxedFormatterMixin, EscapeFormatter):
def __init__(self, env, escape):
SandboxedFormatterMixin.__init__(self, env)
EscapeFormatter.__init__(self, escape)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/visitor.py
|
# -*- coding: utf-8 -*-
"""API for traversing the AST nodes. Implemented by the compiler and
meta introspection.
"""
from .nodes import Node
class NodeVisitor(object):
"""Walks the abstract syntax tree and call visitor functions for every
node found. The visitor functions may return values which will be
forwarded by the `visit` method.
Per default the visitor functions for the nodes are ``'visit_'`` +
class name of the node. So a `TryFinally` node visit function would
be `visit_TryFinally`. This behavior can be changed by overriding
the `get_visitor` function. If no visitor function exists for a node
(return value `None`) the `generic_visit` visitor is used instead.
"""
def get_visitor(self, node):
"""Return the visitor function for this node or `None` if no visitor
exists for this node. In that case the generic visit function is
used instead.
"""
method = "visit_" + node.__class__.__name__
return getattr(self, method, None)
def visit(self, node, *args, **kwargs):
"""Visit a node."""
f = self.get_visitor(node)
if f is not None:
return f(node, *args, **kwargs)
return self.generic_visit(node, *args, **kwargs)
def generic_visit(self, node, *args, **kwargs):
"""Called if no explicit visitor function exists for a node."""
for node in node.iter_child_nodes():
self.visit(node, *args, **kwargs)
class NodeTransformer(NodeVisitor):
"""Walks the abstract syntax tree and allows modifications of nodes.
The `NodeTransformer` will walk the AST and use the return value of the
visitor functions to replace or remove the old node. If the return
value of the visitor function is `None` the node will be removed
from the previous location otherwise it's replaced with the return
value. The return value may be the original node in which case no
replacement takes place.
"""
def generic_visit(self, node, *args, **kwargs):
for field, old_value in node.iter_fields():
if isinstance(old_value, list):
new_values = []
for value in old_value:
if isinstance(value, Node):
value = self.visit(value, *args, **kwargs)
if value is None:
continue
elif not isinstance(value, Node):
new_values.extend(value)
continue
new_values.append(value)
old_value[:] = new_values
elif isinstance(old_value, Node):
new_node = self.visit(old_value, *args, **kwargs)
if new_node is None:
delattr(node, field)
else:
setattr(node, field, new_node)
return node
def visit_list(self, node, *args, **kwargs):
"""As transformers may return lists in some places this method
can be used to enforce a list as return value.
"""
rv = self.visit(node, *args, **kwargs)
if not isinstance(rv, list):
rv = [rv]
return rv
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/utils.py
|
# -*- coding: utf-8 -*-
import json
import os
import re
import warnings
from collections import deque
from random import choice
from random import randrange
from threading import Lock
from markupsafe import escape
from markupsafe import Markup
from ._compat import abc
from ._compat import string_types
from ._compat import text_type
from ._compat import url_quote
_word_split_re = re.compile(r"(\s+)")
_punctuation_re = re.compile(
"^(?P<lead>(?:%s)*)(?P<middle>.*?)(?P<trail>(?:%s)*)$"
% (
"|".join(map(re.escape, ("(", "<", "<"))),
"|".join(map(re.escape, (".", ",", ")", ">", "\n", ">"))),
)
)
_simple_email_re = re.compile(r"^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$")
_striptags_re = re.compile(r"(<!--.*?-->|<[^>]*>)")
_entity_re = re.compile(r"&([^;]+);")
_letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
_digits = "0123456789"
# special singleton representing missing values for the runtime
missing = type("MissingType", (), {"__repr__": lambda x: "missing"})()
# internal code
internal_code = set()
concat = u"".join
_slash_escape = "\\/" not in json.dumps("/")
def contextfunction(f):
"""This decorator can be used to mark a function or method context callable.
A context callable is passed the active :class:`Context` as first argument when
called from the template. This is useful if a function wants to get access
to the context or functions provided on the context object. For example
a function that returns a sorted list of template variables the current
template exports could look like this::
@contextfunction
def get_exported_names(context):
return sorted(context.exported_vars)
"""
f.contextfunction = True
return f
def evalcontextfunction(f):
"""This decorator can be used to mark a function or method as an eval
context callable. This is similar to the :func:`contextfunction`
but instead of passing the context, an evaluation context object is
passed. For more information about the eval context, see
:ref:`eval-context`.
.. versionadded:: 2.4
"""
f.evalcontextfunction = True
return f
def environmentfunction(f):
"""This decorator can be used to mark a function or method as environment
callable. This decorator works exactly like the :func:`contextfunction`
decorator just that the first argument is the active :class:`Environment`
and not context.
"""
f.environmentfunction = True
return f
def internalcode(f):
"""Marks the function as internally used"""
internal_code.add(f.__code__)
return f
def is_undefined(obj):
"""Check if the object passed is undefined. This does nothing more than
performing an instance check against :class:`Undefined` but looks nicer.
This can be used for custom filters or tests that want to react to
undefined variables. For example a custom default filter can look like
this::
def default(var, default=''):
if is_undefined(var):
return default
return var
"""
from .runtime import Undefined
return isinstance(obj, Undefined)
def consume(iterable):
"""Consumes an iterable without doing anything with it."""
for _ in iterable:
pass
def clear_caches():
"""Jinja keeps internal caches for environments and lexers. These are
used so that Jinja doesn't have to recreate environments and lexers all
the time. Normally you don't have to care about that but if you are
measuring memory consumption you may want to clean the caches.
"""
from .environment import _spontaneous_environments
from .lexer import _lexer_cache
_spontaneous_environments.clear()
_lexer_cache.clear()
def import_string(import_name, silent=False):
"""Imports an object based on a string. This is useful if you want to
use import paths as endpoints or something similar. An import path can
be specified either in dotted notation (``xml.sax.saxutils.escape``)
or with a colon as object delimiter (``xml.sax.saxutils:escape``).
If the `silent` is True the return value will be `None` if the import
fails.
:return: imported object
"""
try:
if ":" in import_name:
module, obj = import_name.split(":", 1)
elif "." in import_name:
module, _, obj = import_name.rpartition(".")
else:
return __import__(import_name)
return getattr(__import__(module, None, None, [obj]), obj)
except (ImportError, AttributeError):
if not silent:
raise
def open_if_exists(filename, mode="rb"):
"""Returns a file descriptor for the filename if that file exists,
otherwise ``None``.
"""
if not os.path.isfile(filename):
return None
return open(filename, mode)
def object_type_repr(obj):
"""Returns the name of the object's type. For some recognized
singletons the name of the object is returned instead. (For
example for `None` and `Ellipsis`).
"""
if obj is None:
return "None"
elif obj is Ellipsis:
return "Ellipsis"
cls = type(obj)
# __builtin__ in 2.x, builtins in 3.x
if cls.__module__ in ("__builtin__", "builtins"):
name = cls.__name__
else:
name = cls.__module__ + "." + cls.__name__
return "%s object" % name
def pformat(obj, verbose=False):
"""Prettyprint an object. Either use the `pretty` library or the
builtin `pprint`.
"""
try:
from pretty import pretty
return pretty(obj, verbose=verbose)
except ImportError:
from pprint import pformat
return pformat(obj)
def urlize(text, trim_url_limit=None, rel=None, target=None):
"""Converts any URLs in text into clickable links. Works on http://,
https:// and www. links. Links can have trailing punctuation (periods,
commas, close-parens) and leading punctuation (opening parens) and
it'll still do the right thing.
If trim_url_limit is not None, the URLs in link text will be limited
to trim_url_limit characters.
If nofollow is True, the URLs in link text will get a rel="nofollow"
attribute.
If target is not None, a target attribute will be added to the link.
"""
trim_url = (
lambda x, limit=trim_url_limit: limit is not None
and (x[:limit] + (len(x) >= limit and "..." or ""))
or x
)
words = _word_split_re.split(text_type(escape(text)))
rel_attr = rel and ' rel="%s"' % text_type(escape(rel)) or ""
target_attr = target and ' target="%s"' % escape(target) or ""
for i, word in enumerate(words):
match = _punctuation_re.match(word)
if match:
lead, middle, trail = match.groups()
if middle.startswith("www.") or (
"@" not in middle
and not middle.startswith("http://")
and not middle.startswith("https://")
and len(middle) > 0
and middle[0] in _letters + _digits
and (
middle.endswith(".org")
or middle.endswith(".net")
or middle.endswith(".com")
)
):
middle = '<a href="http://%s"%s%s>%s</a>' % (
middle,
rel_attr,
target_attr,
trim_url(middle),
)
if middle.startswith("http://") or middle.startswith("https://"):
middle = '<a href="%s"%s%s>%s</a>' % (
middle,
rel_attr,
target_attr,
trim_url(middle),
)
if (
"@" in middle
and not middle.startswith("www.")
and ":" not in middle
and _simple_email_re.match(middle)
):
middle = '<a href="mailto:%s">%s</a>' % (middle, middle)
if lead + middle + trail != word:
words[i] = lead + middle + trail
return u"".join(words)
def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
"""Generate some lorem ipsum for the template."""
from .constants import LOREM_IPSUM_WORDS
words = LOREM_IPSUM_WORDS.split()
result = []
for _ in range(n):
next_capitalized = True
last_comma = last_fullstop = 0
word = None
last = None
p = []
# each paragraph contains out of 20 to 100 words.
for idx, _ in enumerate(range(randrange(min, max))):
while True:
word = choice(words)
if word != last:
last = word
break
if next_capitalized:
word = word.capitalize()
next_capitalized = False
# add commas
if idx - randrange(3, 8) > last_comma:
last_comma = idx
last_fullstop += 2
word += ","
# add end of sentences
if idx - randrange(10, 20) > last_fullstop:
last_comma = last_fullstop = idx
word += "."
next_capitalized = True
p.append(word)
# ensure that the paragraph ends with a dot.
p = u" ".join(p)
if p.endswith(","):
p = p[:-1] + "."
elif not p.endswith("."):
p += "."
result.append(p)
if not html:
return u"\n\n".join(result)
return Markup(u"\n".join(u"<p>%s</p>" % escape(x) for x in result))
def unicode_urlencode(obj, charset="utf-8", for_qs=False):
"""Quote a string for use in a URL using the given charset.
This function is misnamed, it is a wrapper around
:func:`urllib.parse.quote`.
:param obj: String or bytes to quote. Other types are converted to
string then encoded to bytes using the given charset.
:param charset: Encode text to bytes using this charset.
:param for_qs: Quote "/" and use "+" for spaces.
"""
if not isinstance(obj, string_types):
obj = text_type(obj)
if isinstance(obj, text_type):
obj = obj.encode(charset)
safe = b"" if for_qs else b"/"
rv = url_quote(obj, safe)
if not isinstance(rv, text_type):
rv = rv.decode("utf-8")
if for_qs:
rv = rv.replace("%20", "+")
return rv
class LRUCache(object):
"""A simple LRU Cache implementation."""
# this is fast for small capacities (something below 1000) but doesn't
# scale. But as long as it's only used as storage for templates this
# won't do any harm.
def __init__(self, capacity):
self.capacity = capacity
self._mapping = {}
self._queue = deque()
self._postinit()
def _postinit(self):
# alias all queue methods for faster lookup
self._popleft = self._queue.popleft
self._pop = self._queue.pop
self._remove = self._queue.remove
self._wlock = Lock()
self._append = self._queue.append
def __getstate__(self):
return {
"capacity": self.capacity,
"_mapping": self._mapping,
"_queue": self._queue,
}
def __setstate__(self, d):
self.__dict__.update(d)
self._postinit()
def __getnewargs__(self):
return (self.capacity,)
def copy(self):
"""Return a shallow copy of the instance."""
rv = self.__class__(self.capacity)
rv._mapping.update(self._mapping)
rv._queue.extend(self._queue)
return rv
def get(self, key, default=None):
"""Return an item from the cache dict or `default`"""
try:
return self[key]
except KeyError:
return default
def setdefault(self, key, default=None):
"""Set `default` if the key is not in the cache otherwise
leave unchanged. Return the value of this key.
"""
try:
return self[key]
except KeyError:
self[key] = default
return default
def clear(self):
"""Clear the cache."""
self._wlock.acquire()
try:
self._mapping.clear()
self._queue.clear()
finally:
self._wlock.release()
def __contains__(self, key):
"""Check if a key exists in this cache."""
return key in self._mapping
def __len__(self):
"""Return the current size of the cache."""
return len(self._mapping)
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, self._mapping)
def __getitem__(self, key):
"""Get an item from the cache. Moves the item up so that it has the
highest priority then.
Raise a `KeyError` if it does not exist.
"""
self._wlock.acquire()
try:
rv = self._mapping[key]
if self._queue[-1] != key:
try:
self._remove(key)
except ValueError:
# if something removed the key from the container
# when we read, ignore the ValueError that we would
# get otherwise.
pass
self._append(key)
return rv
finally:
self._wlock.release()
def __setitem__(self, key, value):
"""Sets the value for an item. Moves the item up so that it
has the highest priority then.
"""
self._wlock.acquire()
try:
if key in self._mapping:
self._remove(key)
elif len(self._mapping) == self.capacity:
del self._mapping[self._popleft()]
self._append(key)
self._mapping[key] = value
finally:
self._wlock.release()
def __delitem__(self, key):
"""Remove an item from the cache dict.
Raise a `KeyError` if it does not exist.
"""
self._wlock.acquire()
try:
del self._mapping[key]
try:
self._remove(key)
except ValueError:
pass
finally:
self._wlock.release()
def items(self):
"""Return a list of items."""
result = [(key, self._mapping[key]) for key in list(self._queue)]
result.reverse()
return result
def iteritems(self):
"""Iterate over all items."""
warnings.warn(
"'iteritems()' will be removed in version 3.0. Use"
" 'iter(cache.items())' instead.",
DeprecationWarning,
stacklevel=2,
)
return iter(self.items())
def values(self):
"""Return a list of all values."""
return [x[1] for x in self.items()]
def itervalue(self):
"""Iterate over all values."""
warnings.warn(
"'itervalue()' will be removed in version 3.0. Use"
" 'iter(cache.values())' instead.",
DeprecationWarning,
stacklevel=2,
)
return iter(self.values())
def itervalues(self):
"""Iterate over all values."""
warnings.warn(
"'itervalues()' will be removed in version 3.0. Use"
" 'iter(cache.values())' instead.",
DeprecationWarning,
stacklevel=2,
)
return iter(self.values())
def keys(self):
"""Return a list of all keys ordered by most recent usage."""
return list(self)
def iterkeys(self):
"""Iterate over all keys in the cache dict, ordered by
the most recent usage.
"""
warnings.warn(
"'iterkeys()' will be removed in version 3.0. Use"
" 'iter(cache.keys())' instead.",
DeprecationWarning,
stacklevel=2,
)
return iter(self)
def __iter__(self):
return reversed(tuple(self._queue))
def __reversed__(self):
"""Iterate over the keys in the cache dict, oldest items
coming first.
"""
return iter(tuple(self._queue))
__copy__ = copy
abc.MutableMapping.register(LRUCache)
def select_autoescape(
enabled_extensions=("html", "htm", "xml"),
disabled_extensions=(),
default_for_string=True,
default=False,
):
"""Intelligently sets the initial value of autoescaping based on the
filename of the template. This is the recommended way to configure
autoescaping if you do not want to write a custom function yourself.
If you want to enable it for all templates created from strings or
for all templates with `.html` and `.xml` extensions::
from jinja2 import Environment, select_autoescape
env = Environment(autoescape=select_autoescape(
enabled_extensions=('html', 'xml'),
default_for_string=True,
))
Example configuration to turn it on at all times except if the template
ends with `.txt`::
from jinja2 import Environment, select_autoescape
env = Environment(autoescape=select_autoescape(
disabled_extensions=('txt',),
default_for_string=True,
default=True,
))
The `enabled_extensions` is an iterable of all the extensions that
autoescaping should be enabled for. Likewise `disabled_extensions` is
a list of all templates it should be disabled for. If a template is
loaded from a string then the default from `default_for_string` is used.
If nothing matches then the initial value of autoescaping is set to the
value of `default`.
For security reasons this function operates case insensitive.
.. versionadded:: 2.9
"""
enabled_patterns = tuple("." + x.lstrip(".").lower() for x in enabled_extensions)
disabled_patterns = tuple("." + x.lstrip(".").lower() for x in disabled_extensions)
def autoescape(template_name):
if template_name is None:
return default_for_string
template_name = template_name.lower()
if template_name.endswith(enabled_patterns):
return True
if template_name.endswith(disabled_patterns):
return False
return default
return autoescape
def htmlsafe_json_dumps(obj, dumper=None, **kwargs):
"""Works exactly like :func:`dumps` but is safe for use in ``<script>``
tags. It accepts the same arguments and returns a JSON string. Note that
this is available in templates through the ``|tojson`` filter which will
also mark the result as safe. Due to how this function escapes certain
characters this is safe even if used outside of ``<script>`` tags.
The following characters are escaped in strings:
- ``<``
- ``>``
- ``&``
- ``'``
This makes it safe to embed such strings in any place in HTML with the
notable exception of double quoted attributes. In that case single
quote your attributes or HTML escape it in addition.
"""
if dumper is None:
dumper = json.dumps
rv = (
dumper(obj, **kwargs)
.replace(u"<", u"\\u003c")
.replace(u">", u"\\u003e")
.replace(u"&", u"\\u0026")
.replace(u"'", u"\\u0027")
)
return Markup(rv)
class Cycler(object):
"""Cycle through values by yield them one at a time, then restarting
once the end is reached. Available as ``cycler`` in templates.
Similar to ``loop.cycle``, but can be used outside loops or across
multiple loops. For example, render a list of folders and files in a
list, alternating giving them "odd" and "even" classes.
.. code-block:: html+jinja
{% set row_class = cycler("odd", "even") %}
<ul class="browser">
{% for folder in folders %}
<li class="folder {{ row_class.next() }}">{{ folder }}
{% endfor %}
{% for file in files %}
<li class="file {{ row_class.next() }}">{{ file }}
{% endfor %}
</ul>
:param items: Each positional argument will be yielded in the order
given for each cycle.
.. versionadded:: 2.1
"""
def __init__(self, *items):
if not items:
raise RuntimeError("at least one item has to be provided")
self.items = items
self.pos = 0
def reset(self):
"""Resets the current item to the first item."""
self.pos = 0
@property
def current(self):
"""Return the current item. Equivalent to the item that will be
returned next time :meth:`next` is called.
"""
return self.items[self.pos]
def next(self):
"""Return the current item, then advance :attr:`current` to the
next item.
"""
rv = self.current
self.pos = (self.pos + 1) % len(self.items)
return rv
__next__ = next
class Joiner(object):
"""A joining helper for templates."""
def __init__(self, sep=u", "):
self.sep = sep
self.used = False
def __call__(self):
if not self.used:
self.used = True
return u""
return self.sep
class Namespace(object):
"""A namespace object that can hold arbitrary attributes. It may be
initialized from a dictionary or with keyword arguments."""
def __init__(*args, **kwargs): # noqa: B902
self, args = args[0], args[1:]
self.__attrs = dict(*args, **kwargs)
def __getattribute__(self, name):
# __class__ is needed for the awaitable check in async mode
if name in {"_Namespace__attrs", "__class__"}:
return object.__getattribute__(self, name)
try:
return self.__attrs[name]
except KeyError:
raise AttributeError(name)
def __setitem__(self, name, value):
self.__attrs[name] = value
def __repr__(self):
return "<Namespace %r>" % self.__attrs
# does this python version support async for in and async generators?
try:
exec("async def _():\n async for _ in ():\n yield _")
have_async_gen = True
except SyntaxError:
have_async_gen = False
def soft_unicode(s):
from markupsafe import soft_unicode
warnings.warn(
"'jinja2.utils.soft_unicode' will be removed in version 3.0."
" Use 'markupsafe.soft_unicode' instead.",
DeprecationWarning,
stacklevel=2,
)
return soft_unicode(s)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/debug.py
|
import sys
from types import CodeType
from . import TemplateSyntaxError
from ._compat import PYPY
from .utils import internal_code
from .utils import missing
def rewrite_traceback_stack(source=None):
"""Rewrite the current exception to replace any tracebacks from
within compiled template code with tracebacks that look like they
came from the template source.
This must be called within an ``except`` block.
:param exc_info: A :meth:`sys.exc_info` tuple. If not provided,
the current ``exc_info`` is used.
:param source: For ``TemplateSyntaxError``, the original source if
known.
:return: A :meth:`sys.exc_info` tuple that can be re-raised.
"""
exc_type, exc_value, tb = sys.exc_info()
if isinstance(exc_value, TemplateSyntaxError) and not exc_value.translated:
exc_value.translated = True
exc_value.source = source
try:
# Remove the old traceback on Python 3, otherwise the frames
# from the compiler still show up.
exc_value.with_traceback(None)
except AttributeError:
pass
# Outside of runtime, so the frame isn't executing template
# code, but it still needs to point at the template.
tb = fake_traceback(
exc_value, None, exc_value.filename or "<unknown>", exc_value.lineno
)
else:
# Skip the frame for the render function.
tb = tb.tb_next
stack = []
# Build the stack of traceback object, replacing any in template
# code with the source file and line information.
while tb is not None:
# Skip frames decorated with @internalcode. These are internal
# calls that aren't useful in template debugging output.
if tb.tb_frame.f_code in internal_code:
tb = tb.tb_next
continue
template = tb.tb_frame.f_globals.get("__jinja_template__")
if template is not None:
lineno = template.get_corresponding_lineno(tb.tb_lineno)
fake_tb = fake_traceback(exc_value, tb, template.filename, lineno)
stack.append(fake_tb)
else:
stack.append(tb)
tb = tb.tb_next
tb_next = None
# Assign tb_next in reverse to avoid circular references.
for tb in reversed(stack):
tb_next = tb_set_next(tb, tb_next)
return exc_type, exc_value, tb_next
def fake_traceback(exc_value, tb, filename, lineno):
"""Produce a new traceback object that looks like it came from the
template source instead of the compiled code. The filename, line
number, and location name will point to the template, and the local
variables will be the current template context.
:param exc_value: The original exception to be re-raised to create
the new traceback.
:param tb: The original traceback to get the local variables and
code info from.
:param filename: The template filename.
:param lineno: The line number in the template source.
"""
if tb is not None:
# Replace the real locals with the context that would be
# available at that point in the template.
locals = get_template_locals(tb.tb_frame.f_locals)
locals.pop("__jinja_exception__", None)
else:
locals = {}
globals = {
"__name__": filename,
"__file__": filename,
"__jinja_exception__": exc_value,
}
# Raise an exception at the correct line number.
code = compile("\n" * (lineno - 1) + "raise __jinja_exception__", filename, "exec")
# Build a new code object that points to the template file and
# replaces the location with a block name.
try:
location = "template"
if tb is not None:
function = tb.tb_frame.f_code.co_name
if function == "root":
location = "top-level template code"
elif function.startswith("block_"):
location = 'block "%s"' % function[6:]
# Collect arguments for the new code object. CodeType only
# accepts positional arguments, and arguments were inserted in
# new Python versions.
code_args = []
for attr in (
"argcount",
"posonlyargcount", # Python 3.8
"kwonlyargcount", # Python 3
"nlocals",
"stacksize",
"flags",
"code", # codestring
"consts", # constants
"names",
"varnames",
("filename", filename),
("name", location),
"firstlineno",
"lnotab",
"freevars",
"cellvars",
):
if isinstance(attr, tuple):
# Replace with given value.
code_args.append(attr[1])
continue
try:
# Copy original value if it exists.
code_args.append(getattr(code, "co_" + attr))
except AttributeError:
# Some arguments were added later.
continue
code = CodeType(*code_args)
except Exception:
# Some environments such as Google App Engine don't support
# modifying code objects.
pass
# Execute the new code, which is guaranteed to raise, and return
# the new traceback without this frame.
try:
exec(code, globals, locals)
except BaseException:
return sys.exc_info()[2].tb_next
def get_template_locals(real_locals):
"""Based on the runtime locals, get the context that would be
available at that point in the template.
"""
# Start with the current template context.
ctx = real_locals.get("context")
if ctx:
data = ctx.get_all().copy()
else:
data = {}
# Might be in a derived context that only sets local variables
# rather than pushing a context. Local variables follow the scheme
# l_depth_name. Find the highest-depth local that has a value for
# each name.
local_overrides = {}
for name, value in real_locals.items():
if not name.startswith("l_") or value is missing:
# Not a template variable, or no longer relevant.
continue
try:
_, depth, name = name.split("_", 2)
depth = int(depth)
except ValueError:
continue
cur_depth = local_overrides.get(name, (-1,))[0]
if cur_depth < depth:
local_overrides[name] = (depth, value)
# Modify the context with any derived context.
for name, (_, value) in local_overrides.items():
if value is missing:
data.pop(name, None)
else:
data[name] = value
return data
if sys.version_info >= (3, 7):
# tb_next is directly assignable as of Python 3.7
def tb_set_next(tb, tb_next):
tb.tb_next = tb_next
return tb
elif PYPY:
# PyPy might have special support, and won't work with ctypes.
try:
import tputil
except ImportError:
# Without tproxy support, use the original traceback.
def tb_set_next(tb, tb_next):
return tb
else:
# With tproxy support, create a proxy around the traceback that
# returns the new tb_next.
def tb_set_next(tb, tb_next):
def controller(op):
if op.opname == "__getattribute__" and op.args[0] == "tb_next":
return tb_next
return op.delegate()
return tputil.make_proxy(controller, obj=tb)
else:
# Use ctypes to assign tb_next at the C level since it's read-only
# from Python.
import ctypes
class _CTraceback(ctypes.Structure):
_fields_ = [
# Extra PyObject slots when compiled with Py_TRACE_REFS.
("PyObject_HEAD", ctypes.c_byte * object().__sizeof__()),
# Only care about tb_next as an object, not a traceback.
("tb_next", ctypes.py_object),
]
def tb_set_next(tb, tb_next):
c_tb = _CTraceback.from_address(id(tb))
# Clear out the old tb_next.
if tb.tb_next is not None:
c_tb_next = ctypes.py_object(tb.tb_next)
c_tb.tb_next = ctypes.py_object()
ctypes.pythonapi.Py_DecRef(c_tb_next)
# Assign the new tb_next.
if tb_next is not None:
c_tb_next = ctypes.py_object(tb_next)
ctypes.pythonapi.Py_IncRef(c_tb_next)
c_tb.tb_next = c_tb_next
return tb
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/lexer.py
|
# -*- coding: utf-8 -*-
"""Implements a Jinja / Python combination lexer. The ``Lexer`` class
is used to do some preprocessing. It filters out invalid operators like
the bitshift operators we don't allow in templates. It separates
template code and python code in expressions.
"""
import re
from ast import literal_eval
from collections import deque
from operator import itemgetter
from ._compat import implements_iterator
from ._compat import intern
from ._compat import iteritems
from ._compat import text_type
from .exceptions import TemplateSyntaxError
from .utils import LRUCache
# cache for the lexers. Exists in order to be able to have multiple
# environments with the same lexer
_lexer_cache = LRUCache(50)
# static regular expressions
whitespace_re = re.compile(r"\s+", re.U)
newline_re = re.compile(r"(\r\n|\r|\n)")
string_re = re.compile(
r"('([^'\\]*(?:\\.[^'\\]*)*)'" r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S
)
integer_re = re.compile(r"(\d+_)*\d+")
float_re = re.compile(
r"""
(?<!\.) # doesn't start with a .
(\d+_)*\d+ # digits, possibly _ separated
(
(\.(\d+_)*\d+)? # optional fractional part
e[+\-]?(\d+_)*\d+ # exponent part
|
\.(\d+_)*\d+ # required fractional part
)
""",
re.IGNORECASE | re.VERBOSE,
)
try:
# check if this Python supports Unicode identifiers
compile("föö", "<unknown>", "eval")
except SyntaxError:
# Python 2, no Unicode support, use ASCII identifiers
name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*")
check_ident = False
else:
# Unicode support, import generated re pattern and set flag to use
# str.isidentifier to validate during lexing.
from ._identifier import pattern as name_re
check_ident = True
# internal the tokens and keep references to them
TOKEN_ADD = intern("add")
TOKEN_ASSIGN = intern("assign")
TOKEN_COLON = intern("colon")
TOKEN_COMMA = intern("comma")
TOKEN_DIV = intern("div")
TOKEN_DOT = intern("dot")
TOKEN_EQ = intern("eq")
TOKEN_FLOORDIV = intern("floordiv")
TOKEN_GT = intern("gt")
TOKEN_GTEQ = intern("gteq")
TOKEN_LBRACE = intern("lbrace")
TOKEN_LBRACKET = intern("lbracket")
TOKEN_LPAREN = intern("lparen")
TOKEN_LT = intern("lt")
TOKEN_LTEQ = intern("lteq")
TOKEN_MOD = intern("mod")
TOKEN_MUL = intern("mul")
TOKEN_NE = intern("ne")
TOKEN_PIPE = intern("pipe")
TOKEN_POW = intern("pow")
TOKEN_RBRACE = intern("rbrace")
TOKEN_RBRACKET = intern("rbracket")
TOKEN_RPAREN = intern("rparen")
TOKEN_SEMICOLON = intern("semicolon")
TOKEN_SUB = intern("sub")
TOKEN_TILDE = intern("tilde")
TOKEN_WHITESPACE = intern("whitespace")
TOKEN_FLOAT = intern("float")
TOKEN_INTEGER = intern("integer")
TOKEN_NAME = intern("name")
TOKEN_STRING = intern("string")
TOKEN_OPERATOR = intern("operator")
TOKEN_BLOCK_BEGIN = intern("block_begin")
TOKEN_BLOCK_END = intern("block_end")
TOKEN_VARIABLE_BEGIN = intern("variable_begin")
TOKEN_VARIABLE_END = intern("variable_end")
TOKEN_RAW_BEGIN = intern("raw_begin")
TOKEN_RAW_END = intern("raw_end")
TOKEN_COMMENT_BEGIN = intern("comment_begin")
TOKEN_COMMENT_END = intern("comment_end")
TOKEN_COMMENT = intern("comment")
TOKEN_LINESTATEMENT_BEGIN = intern("linestatement_begin")
TOKEN_LINESTATEMENT_END = intern("linestatement_end")
TOKEN_LINECOMMENT_BEGIN = intern("linecomment_begin")
TOKEN_LINECOMMENT_END = intern("linecomment_end")
TOKEN_LINECOMMENT = intern("linecomment")
TOKEN_DATA = intern("data")
TOKEN_INITIAL = intern("initial")
TOKEN_EOF = intern("eof")
# bind operators to token types
operators = {
"+": TOKEN_ADD,
"-": TOKEN_SUB,
"/": TOKEN_DIV,
"//": TOKEN_FLOORDIV,
"*": TOKEN_MUL,
"%": TOKEN_MOD,
"**": TOKEN_POW,
"~": TOKEN_TILDE,
"[": TOKEN_LBRACKET,
"]": TOKEN_RBRACKET,
"(": TOKEN_LPAREN,
")": TOKEN_RPAREN,
"{": TOKEN_LBRACE,
"}": TOKEN_RBRACE,
"==": TOKEN_EQ,
"!=": TOKEN_NE,
">": TOKEN_GT,
">=": TOKEN_GTEQ,
"<": TOKEN_LT,
"<=": TOKEN_LTEQ,
"=": TOKEN_ASSIGN,
".": TOKEN_DOT,
":": TOKEN_COLON,
"|": TOKEN_PIPE,
",": TOKEN_COMMA,
";": TOKEN_SEMICOLON,
}
reverse_operators = dict([(v, k) for k, v in iteritems(operators)])
assert len(operators) == len(reverse_operators), "operators dropped"
operator_re = re.compile(
"(%s)" % "|".join(re.escape(x) for x in sorted(operators, key=lambda x: -len(x)))
)
ignored_tokens = frozenset(
[
TOKEN_COMMENT_BEGIN,
TOKEN_COMMENT,
TOKEN_COMMENT_END,
TOKEN_WHITESPACE,
TOKEN_LINECOMMENT_BEGIN,
TOKEN_LINECOMMENT_END,
TOKEN_LINECOMMENT,
]
)
ignore_if_empty = frozenset(
[TOKEN_WHITESPACE, TOKEN_DATA, TOKEN_COMMENT, TOKEN_LINECOMMENT]
)
def _describe_token_type(token_type):
if token_type in reverse_operators:
return reverse_operators[token_type]
return {
TOKEN_COMMENT_BEGIN: "begin of comment",
TOKEN_COMMENT_END: "end of comment",
TOKEN_COMMENT: "comment",
TOKEN_LINECOMMENT: "comment",
TOKEN_BLOCK_BEGIN: "begin of statement block",
TOKEN_BLOCK_END: "end of statement block",
TOKEN_VARIABLE_BEGIN: "begin of print statement",
TOKEN_VARIABLE_END: "end of print statement",
TOKEN_LINESTATEMENT_BEGIN: "begin of line statement",
TOKEN_LINESTATEMENT_END: "end of line statement",
TOKEN_DATA: "template data / text",
TOKEN_EOF: "end of template",
}.get(token_type, token_type)
def describe_token(token):
"""Returns a description of the token."""
if token.type == TOKEN_NAME:
return token.value
return _describe_token_type(token.type)
def describe_token_expr(expr):
"""Like `describe_token` but for token expressions."""
if ":" in expr:
type, value = expr.split(":", 1)
if type == TOKEN_NAME:
return value
else:
type = expr
return _describe_token_type(type)
def count_newlines(value):
"""Count the number of newline characters in the string. This is
useful for extensions that filter a stream.
"""
return len(newline_re.findall(value))
def compile_rules(environment):
"""Compiles all the rules from the environment into a list of rules."""
e = re.escape
rules = [
(
len(environment.comment_start_string),
TOKEN_COMMENT_BEGIN,
e(environment.comment_start_string),
),
(
len(environment.block_start_string),
TOKEN_BLOCK_BEGIN,
e(environment.block_start_string),
),
(
len(environment.variable_start_string),
TOKEN_VARIABLE_BEGIN,
e(environment.variable_start_string),
),
]
if environment.line_statement_prefix is not None:
rules.append(
(
len(environment.line_statement_prefix),
TOKEN_LINESTATEMENT_BEGIN,
r"^[ \t\v]*" + e(environment.line_statement_prefix),
)
)
if environment.line_comment_prefix is not None:
rules.append(
(
len(environment.line_comment_prefix),
TOKEN_LINECOMMENT_BEGIN,
r"(?:^|(?<=\S))[^\S\r\n]*" + e(environment.line_comment_prefix),
)
)
return [x[1:] for x in sorted(rules, reverse=True)]
class Failure(object):
"""Class that raises a `TemplateSyntaxError` if called.
Used by the `Lexer` to specify known errors.
"""
def __init__(self, message, cls=TemplateSyntaxError):
self.message = message
self.error_class = cls
def __call__(self, lineno, filename):
raise self.error_class(self.message, lineno, filename)
class Token(tuple):
"""Token class."""
__slots__ = ()
lineno, type, value = (property(itemgetter(x)) for x in range(3))
def __new__(cls, lineno, type, value):
return tuple.__new__(cls, (lineno, intern(str(type)), value))
def __str__(self):
if self.type in reverse_operators:
return reverse_operators[self.type]
elif self.type == "name":
return self.value
return self.type
def test(self, expr):
"""Test a token against a token expression. This can either be a
token type or ``'token_type:token_value'``. This can only test
against string values and types.
"""
# here we do a regular string equality check as test_any is usually
# passed an iterable of not interned strings.
if self.type == expr:
return True
elif ":" in expr:
return expr.split(":", 1) == [self.type, self.value]
return False
def test_any(self, *iterable):
"""Test against multiple token expressions."""
for expr in iterable:
if self.test(expr):
return True
return False
def __repr__(self):
return "Token(%r, %r, %r)" % (self.lineno, self.type, self.value)
@implements_iterator
class TokenStreamIterator(object):
"""The iterator for tokenstreams. Iterate over the stream
until the eof token is reached.
"""
def __init__(self, stream):
self.stream = stream
def __iter__(self):
return self
def __next__(self):
token = self.stream.current
if token.type is TOKEN_EOF:
self.stream.close()
raise StopIteration()
next(self.stream)
return token
@implements_iterator
class TokenStream(object):
"""A token stream is an iterable that yields :class:`Token`\\s. The
parser however does not iterate over it but calls :meth:`next` to go
one token ahead. The current active token is stored as :attr:`current`.
"""
def __init__(self, generator, name, filename):
self._iter = iter(generator)
self._pushed = deque()
self.name = name
self.filename = filename
self.closed = False
self.current = Token(1, TOKEN_INITIAL, "")
next(self)
def __iter__(self):
return TokenStreamIterator(self)
def __bool__(self):
return bool(self._pushed) or self.current.type is not TOKEN_EOF
__nonzero__ = __bool__ # py2
@property
def eos(self):
"""Are we at the end of the stream?"""
return not self
def push(self, token):
"""Push a token back to the stream."""
self._pushed.append(token)
def look(self):
"""Look at the next token."""
old_token = next(self)
result = self.current
self.push(result)
self.current = old_token
return result
def skip(self, n=1):
"""Got n tokens ahead."""
for _ in range(n):
next(self)
def next_if(self, expr):
"""Perform the token test and return the token if it matched.
Otherwise the return value is `None`.
"""
if self.current.test(expr):
return next(self)
def skip_if(self, expr):
"""Like :meth:`next_if` but only returns `True` or `False`."""
return self.next_if(expr) is not None
def __next__(self):
"""Go one token ahead and return the old one.
Use the built-in :func:`next` instead of calling this directly.
"""
rv = self.current
if self._pushed:
self.current = self._pushed.popleft()
elif self.current.type is not TOKEN_EOF:
try:
self.current = next(self._iter)
except StopIteration:
self.close()
return rv
def close(self):
"""Close the stream."""
self.current = Token(self.current.lineno, TOKEN_EOF, "")
self._iter = None
self.closed = True
def expect(self, expr):
"""Expect a given token type and return it. This accepts the same
argument as :meth:`jinja2.lexer.Token.test`.
"""
if not self.current.test(expr):
expr = describe_token_expr(expr)
if self.current.type is TOKEN_EOF:
raise TemplateSyntaxError(
"unexpected end of template, expected %r." % expr,
self.current.lineno,
self.name,
self.filename,
)
raise TemplateSyntaxError(
"expected token %r, got %r" % (expr, describe_token(self.current)),
self.current.lineno,
self.name,
self.filename,
)
try:
return self.current
finally:
next(self)
def get_lexer(environment):
"""Return a lexer which is probably cached."""
key = (
environment.block_start_string,
environment.block_end_string,
environment.variable_start_string,
environment.variable_end_string,
environment.comment_start_string,
environment.comment_end_string,
environment.line_statement_prefix,
environment.line_comment_prefix,
environment.trim_blocks,
environment.lstrip_blocks,
environment.newline_sequence,
environment.keep_trailing_newline,
)
lexer = _lexer_cache.get(key)
if lexer is None:
lexer = Lexer(environment)
_lexer_cache[key] = lexer
return lexer
class OptionalLStrip(tuple):
"""A special tuple for marking a point in the state that can have
lstrip applied.
"""
__slots__ = ()
# Even though it looks like a no-op, creating instances fails
# without this.
def __new__(cls, *members, **kwargs):
return super(OptionalLStrip, cls).__new__(cls, members)
class Lexer(object):
"""Class that implements a lexer for a given environment. Automatically
created by the environment class, usually you don't have to do that.
Note that the lexer is not automatically bound to an environment.
Multiple environments can share the same lexer.
"""
def __init__(self, environment):
# shortcuts
e = re.escape
def c(x):
return re.compile(x, re.M | re.S)
# lexing rules for tags
tag_rules = [
(whitespace_re, TOKEN_WHITESPACE, None),
(float_re, TOKEN_FLOAT, None),
(integer_re, TOKEN_INTEGER, None),
(name_re, TOKEN_NAME, None),
(string_re, TOKEN_STRING, None),
(operator_re, TOKEN_OPERATOR, None),
]
# assemble the root lexing rule. because "|" is ungreedy
# we have to sort by length so that the lexer continues working
# as expected when we have parsing rules like <% for block and
# <%= for variables. (if someone wants asp like syntax)
# variables are just part of the rules if variable processing
# is required.
root_tag_rules = compile_rules(environment)
# block suffix if trimming is enabled
block_suffix_re = environment.trim_blocks and "\\n?" or ""
# If lstrip is enabled, it should not be applied if there is any
# non-whitespace between the newline and block.
self.lstrip_unless_re = c(r"[^ \t]") if environment.lstrip_blocks else None
self.newline_sequence = environment.newline_sequence
self.keep_trailing_newline = environment.keep_trailing_newline
# global lexing rules
self.rules = {
"root": [
# directives
(
c(
"(.*?)(?:%s)"
% "|".join(
[
r"(?P<raw_begin>%s(\-|\+|)\s*raw\s*(?:\-%s\s*|%s))"
% (
e(environment.block_start_string),
e(environment.block_end_string),
e(environment.block_end_string),
)
]
+ [
r"(?P<%s>%s(\-|\+|))" % (n, r)
for n, r in root_tag_rules
]
)
),
OptionalLStrip(TOKEN_DATA, "#bygroup"),
"#bygroup",
),
# data
(c(".+"), TOKEN_DATA, None),
],
# comments
TOKEN_COMMENT_BEGIN: [
(
c(
r"(.*?)((?:\-%s\s*|%s)%s)"
% (
e(environment.comment_end_string),
e(environment.comment_end_string),
block_suffix_re,
)
),
(TOKEN_COMMENT, TOKEN_COMMENT_END),
"#pop",
),
(c("(.)"), (Failure("Missing end of comment tag"),), None),
],
# blocks
TOKEN_BLOCK_BEGIN: [
(
c(
r"(?:\-%s\s*|%s)%s"
% (
e(environment.block_end_string),
e(environment.block_end_string),
block_suffix_re,
)
),
TOKEN_BLOCK_END,
"#pop",
),
]
+ tag_rules,
# variables
TOKEN_VARIABLE_BEGIN: [
(
c(
r"\-%s\s*|%s"
% (
e(environment.variable_end_string),
e(environment.variable_end_string),
)
),
TOKEN_VARIABLE_END,
"#pop",
)
]
+ tag_rules,
# raw block
TOKEN_RAW_BEGIN: [
(
c(
r"(.*?)((?:%s(\-|\+|))\s*endraw\s*(?:\-%s\s*|%s%s))"
% (
e(environment.block_start_string),
e(environment.block_end_string),
e(environment.block_end_string),
block_suffix_re,
)
),
OptionalLStrip(TOKEN_DATA, TOKEN_RAW_END),
"#pop",
),
(c("(.)"), (Failure("Missing end of raw directive"),), None),
],
# line statements
TOKEN_LINESTATEMENT_BEGIN: [
(c(r"\s*(\n|$)"), TOKEN_LINESTATEMENT_END, "#pop")
]
+ tag_rules,
# line comments
TOKEN_LINECOMMENT_BEGIN: [
(
c(r"(.*?)()(?=\n|$)"),
(TOKEN_LINECOMMENT, TOKEN_LINECOMMENT_END),
"#pop",
)
],
}
def _normalize_newlines(self, value):
"""Called for strings and template data to normalize it to unicode."""
return newline_re.sub(self.newline_sequence, value)
def tokenize(self, source, name=None, filename=None, state=None):
"""Calls tokeniter + tokenize and wraps it in a token stream."""
stream = self.tokeniter(source, name, filename, state)
return TokenStream(self.wrap(stream, name, filename), name, filename)
def wrap(self, stream, name=None, filename=None):
"""This is called with the stream as returned by `tokenize` and wraps
every token in a :class:`Token` and converts the value.
"""
for lineno, token, value in stream:
if token in ignored_tokens:
continue
elif token == TOKEN_LINESTATEMENT_BEGIN:
token = TOKEN_BLOCK_BEGIN
elif token == TOKEN_LINESTATEMENT_END:
token = TOKEN_BLOCK_END
# we are not interested in those tokens in the parser
elif token in (TOKEN_RAW_BEGIN, TOKEN_RAW_END):
continue
elif token == TOKEN_DATA:
value = self._normalize_newlines(value)
elif token == "keyword":
token = value
elif token == TOKEN_NAME:
value = str(value)
if check_ident and not value.isidentifier():
raise TemplateSyntaxError(
"Invalid character in identifier", lineno, name, filename
)
elif token == TOKEN_STRING:
# try to unescape string
try:
value = (
self._normalize_newlines(value[1:-1])
.encode("ascii", "backslashreplace")
.decode("unicode-escape")
)
except Exception as e:
msg = str(e).split(":")[-1].strip()
raise TemplateSyntaxError(msg, lineno, name, filename)
elif token == TOKEN_INTEGER:
value = int(value.replace("_", ""))
elif token == TOKEN_FLOAT:
# remove all "_" first to support more Python versions
value = literal_eval(value.replace("_", ""))
elif token == TOKEN_OPERATOR:
token = operators[value]
yield Token(lineno, token, value)
def tokeniter(self, source, name, filename=None, state=None):
"""This method tokenizes the text and returns the tokens in a
generator. Use this method if you just want to tokenize a template.
"""
source = text_type(source)
lines = source.splitlines()
if self.keep_trailing_newline and source:
for newline in ("\r\n", "\r", "\n"):
if source.endswith(newline):
lines.append("")
break
source = "\n".join(lines)
pos = 0
lineno = 1
stack = ["root"]
if state is not None and state != "root":
assert state in ("variable", "block"), "invalid state"
stack.append(state + "_begin")
statetokens = self.rules[stack[-1]]
source_length = len(source)
balancing_stack = []
lstrip_unless_re = self.lstrip_unless_re
newlines_stripped = 0
line_starting = True
while 1:
# tokenizer loop
for regex, tokens, new_state in statetokens:
m = regex.match(source, pos)
# if no match we try again with the next rule
if m is None:
continue
# we only match blocks and variables if braces / parentheses
# are balanced. continue parsing with the lower rule which
# is the operator rule. do this only if the end tags look
# like operators
if balancing_stack and tokens in (
TOKEN_VARIABLE_END,
TOKEN_BLOCK_END,
TOKEN_LINESTATEMENT_END,
):
continue
# tuples support more options
if isinstance(tokens, tuple):
groups = m.groups()
if isinstance(tokens, OptionalLStrip):
# Rule supports lstrip. Match will look like
# text, block type, whitespace control, type, control, ...
text = groups[0]
# Skipping the text and first type, every other group is the
# whitespace control for each type. One of the groups will be
# -, +, or empty string instead of None.
strip_sign = next(g for g in groups[2::2] if g is not None)
if strip_sign == "-":
# Strip all whitespace between the text and the tag.
stripped = text.rstrip()
newlines_stripped = text[len(stripped) :].count("\n")
groups = (stripped,) + groups[1:]
elif (
# Not marked for preserving whitespace.
strip_sign != "+"
# lstrip is enabled.
and lstrip_unless_re is not None
# Not a variable expression.
and not m.groupdict().get(TOKEN_VARIABLE_BEGIN)
):
# The start of text between the last newline and the tag.
l_pos = text.rfind("\n") + 1
if l_pos > 0 or line_starting:
# If there's only whitespace between the newline and the
# tag, strip it.
if not lstrip_unless_re.search(text, l_pos):
groups = (text[:l_pos],) + groups[1:]
for idx, token in enumerate(tokens):
# failure group
if token.__class__ is Failure:
raise token(lineno, filename)
# bygroup is a bit more complex, in that case we
# yield for the current token the first named
# group that matched
elif token == "#bygroup":
for key, value in iteritems(m.groupdict()):
if value is not None:
yield lineno, key, value
lineno += value.count("\n")
break
else:
raise RuntimeError(
"%r wanted to resolve "
"the token dynamically"
" but no group matched" % regex
)
# normal group
else:
data = groups[idx]
if data or token not in ignore_if_empty:
yield lineno, token, data
lineno += data.count("\n") + newlines_stripped
newlines_stripped = 0
# strings as token just are yielded as it.
else:
data = m.group()
# update brace/parentheses balance
if tokens == TOKEN_OPERATOR:
if data == "{":
balancing_stack.append("}")
elif data == "(":
balancing_stack.append(")")
elif data == "[":
balancing_stack.append("]")
elif data in ("}", ")", "]"):
if not balancing_stack:
raise TemplateSyntaxError(
"unexpected '%s'" % data, lineno, name, filename
)
expected_op = balancing_stack.pop()
if expected_op != data:
raise TemplateSyntaxError(
"unexpected '%s', "
"expected '%s'" % (data, expected_op),
lineno,
name,
filename,
)
# yield items
if data or tokens not in ignore_if_empty:
yield lineno, tokens, data
lineno += data.count("\n")
line_starting = m.group()[-1:] == "\n"
# fetch new position into new variable so that we can check
# if there is a internal parsing error which would result
# in an infinite loop
pos2 = m.end()
# handle state changes
if new_state is not None:
# remove the uppermost state
if new_state == "#pop":
stack.pop()
# resolve the new state by group checking
elif new_state == "#bygroup":
for key, value in iteritems(m.groupdict()):
if value is not None:
stack.append(key)
break
else:
raise RuntimeError(
"%r wanted to resolve the "
"new state dynamically but"
" no group matched" % regex
)
# direct state name given
else:
stack.append(new_state)
statetokens = self.rules[stack[-1]]
# we are still at the same position and no stack change.
# this means a loop without break condition, avoid that and
# raise error
elif pos2 == pos:
raise RuntimeError(
"%r yielded empty string without stack change" % regex
)
# publish new function and start again
pos = pos2
break
# if loop terminated without break we haven't found a single match
# either we are at the end of the file or we have a problem
else:
# end of text
if pos >= source_length:
return
# something went wrong
raise TemplateSyntaxError(
"unexpected char %r at %d" % (source[pos], pos),
lineno,
name,
filename,
)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/environment.py
|
# -*- coding: utf-8 -*-
"""Classes for managing templates and their runtime and compile time
options.
"""
import os
import sys
import weakref
from functools import partial
from functools import reduce
from markupsafe import Markup
from . import nodes
from ._compat import encode_filename
from ._compat import implements_iterator
from ._compat import implements_to_string
from ._compat import iteritems
from ._compat import PY2
from ._compat import PYPY
from ._compat import reraise
from ._compat import string_types
from ._compat import text_type
from .compiler import CodeGenerator
from .compiler import generate
from .defaults import BLOCK_END_STRING
from .defaults import BLOCK_START_STRING
from .defaults import COMMENT_END_STRING
from .defaults import COMMENT_START_STRING
from .defaults import DEFAULT_FILTERS
from .defaults import DEFAULT_NAMESPACE
from .defaults import DEFAULT_POLICIES
from .defaults import DEFAULT_TESTS
from .defaults import KEEP_TRAILING_NEWLINE
from .defaults import LINE_COMMENT_PREFIX
from .defaults import LINE_STATEMENT_PREFIX
from .defaults import LSTRIP_BLOCKS
from .defaults import NEWLINE_SEQUENCE
from .defaults import TRIM_BLOCKS
from .defaults import VARIABLE_END_STRING
from .defaults import VARIABLE_START_STRING
from .exceptions import TemplateNotFound
from .exceptions import TemplateRuntimeError
from .exceptions import TemplatesNotFound
from .exceptions import TemplateSyntaxError
from .exceptions import UndefinedError
from .lexer import get_lexer
from .lexer import TokenStream
from .nodes import EvalContext
from .parser import Parser
from .runtime import Context
from .runtime import new_context
from .runtime import Undefined
from .utils import concat
from .utils import consume
from .utils import have_async_gen
from .utils import import_string
from .utils import internalcode
from .utils import LRUCache
from .utils import missing
# for direct template usage we have up to ten living environments
_spontaneous_environments = LRUCache(10)
def get_spontaneous_environment(cls, *args):
"""Return a new spontaneous environment. A spontaneous environment
is used for templates created directly rather than through an
existing environment.
:param cls: Environment class to create.
:param args: Positional arguments passed to environment.
"""
key = (cls, args)
try:
return _spontaneous_environments[key]
except KeyError:
_spontaneous_environments[key] = env = cls(*args)
env.shared = True
return env
def create_cache(size):
"""Return the cache class for the given size."""
if size == 0:
return None
if size < 0:
return {}
return LRUCache(size)
def copy_cache(cache):
"""Create an empty copy of the given cache."""
if cache is None:
return None
elif type(cache) is dict:
return {}
return LRUCache(cache.capacity)
def load_extensions(environment, extensions):
"""Load the extensions from the list and bind it to the environment.
Returns a dict of instantiated environments.
"""
result = {}
for extension in extensions:
if isinstance(extension, string_types):
extension = import_string(extension)
result[extension.identifier] = extension(environment)
return result
def fail_for_missing_callable(string, name):
msg = string % name
if isinstance(name, Undefined):
try:
name._fail_with_undefined_error()
except Exception as e:
msg = "%s (%s; did you forget to quote the callable name?)" % (msg, e)
raise TemplateRuntimeError(msg)
def _environment_sanity_check(environment):
"""Perform a sanity check on the environment."""
assert issubclass(
environment.undefined, Undefined
), "undefined must be a subclass of undefined because filters depend on it."
assert (
environment.block_start_string
!= environment.variable_start_string
!= environment.comment_start_string
), "block, variable and comment start strings must be different"
assert environment.newline_sequence in (
"\r",
"\r\n",
"\n",
), "newline_sequence set to unknown line ending string."
return environment
class Environment(object):
r"""The core component of Jinja is the `Environment`. It contains
important shared variables like configuration, filters, tests,
globals and others. Instances of this class may be modified if
they are not shared and if no template was loaded so far.
Modifications on environments after the first template was loaded
will lead to surprising effects and undefined behavior.
Here are the possible initialization parameters:
`block_start_string`
The string marking the beginning of a block. Defaults to ``'{%'``.
`block_end_string`
The string marking the end of a block. Defaults to ``'%}'``.
`variable_start_string`
The string marking the beginning of a print statement.
Defaults to ``'{{'``.
`variable_end_string`
The string marking the end of a print statement. Defaults to
``'}}'``.
`comment_start_string`
The string marking the beginning of a comment. Defaults to ``'{#'``.
`comment_end_string`
The string marking the end of a comment. Defaults to ``'#}'``.
`line_statement_prefix`
If given and a string, this will be used as prefix for line based
statements. See also :ref:`line-statements`.
`line_comment_prefix`
If given and a string, this will be used as prefix for line based
comments. See also :ref:`line-statements`.
.. versionadded:: 2.2
`trim_blocks`
If this is set to ``True`` the first newline after a block is
removed (block, not variable tag!). Defaults to `False`.
`lstrip_blocks`
If this is set to ``True`` leading spaces and tabs are stripped
from the start of a line to a block. Defaults to `False`.
`newline_sequence`
The sequence that starts a newline. Must be one of ``'\r'``,
``'\n'`` or ``'\r\n'``. The default is ``'\n'`` which is a
useful default for Linux and OS X systems as well as web
applications.
`keep_trailing_newline`
Preserve the trailing newline when rendering templates.
The default is ``False``, which causes a single newline,
if present, to be stripped from the end of the template.
.. versionadded:: 2.7
`extensions`
List of Jinja extensions to use. This can either be import paths
as strings or extension classes. For more information have a
look at :ref:`the extensions documentation <jinja-extensions>`.
`optimized`
should the optimizer be enabled? Default is ``True``.
`undefined`
:class:`Undefined` or a subclass of it that is used to represent
undefined values in the template.
`finalize`
A callable that can be used to process the result of a variable
expression before it is output. For example one can convert
``None`` implicitly into an empty string here.
`autoescape`
If set to ``True`` the XML/HTML autoescaping feature is enabled by
default. For more details about autoescaping see
:class:`~markupsafe.Markup`. As of Jinja 2.4 this can also
be a callable that is passed the template name and has to
return ``True`` or ``False`` depending on autoescape should be
enabled by default.
.. versionchanged:: 2.4
`autoescape` can now be a function
`loader`
The template loader for this environment.
`cache_size`
The size of the cache. Per default this is ``400`` which means
that if more than 400 templates are loaded the loader will clean
out the least recently used template. If the cache size is set to
``0`` templates are recompiled all the time, if the cache size is
``-1`` the cache will not be cleaned.
.. versionchanged:: 2.8
The cache size was increased to 400 from a low 50.
`auto_reload`
Some loaders load templates from locations where the template
sources may change (ie: file system or database). If
``auto_reload`` is set to ``True`` (default) every time a template is
requested the loader checks if the source changed and if yes, it
will reload the template. For higher performance it's possible to
disable that.
`bytecode_cache`
If set to a bytecode cache object, this object will provide a
cache for the internal Jinja bytecode so that templates don't
have to be parsed if they were not changed.
See :ref:`bytecode-cache` for more information.
`enable_async`
If set to true this enables async template execution which allows
you to take advantage of newer Python features. This requires
Python 3.6 or later.
"""
#: if this environment is sandboxed. Modifying this variable won't make
#: the environment sandboxed though. For a real sandboxed environment
#: have a look at jinja2.sandbox. This flag alone controls the code
#: generation by the compiler.
sandboxed = False
#: True if the environment is just an overlay
overlayed = False
#: the environment this environment is linked to if it is an overlay
linked_to = None
#: shared environments have this set to `True`. A shared environment
#: must not be modified
shared = False
#: the class that is used for code generation. See
#: :class:`~jinja2.compiler.CodeGenerator` for more information.
code_generator_class = CodeGenerator
#: the context class thatis used for templates. See
#: :class:`~jinja2.runtime.Context` for more information.
context_class = Context
def __init__(
self,
block_start_string=BLOCK_START_STRING,
block_end_string=BLOCK_END_STRING,
variable_start_string=VARIABLE_START_STRING,
variable_end_string=VARIABLE_END_STRING,
comment_start_string=COMMENT_START_STRING,
comment_end_string=COMMENT_END_STRING,
line_statement_prefix=LINE_STATEMENT_PREFIX,
line_comment_prefix=LINE_COMMENT_PREFIX,
trim_blocks=TRIM_BLOCKS,
lstrip_blocks=LSTRIP_BLOCKS,
newline_sequence=NEWLINE_SEQUENCE,
keep_trailing_newline=KEEP_TRAILING_NEWLINE,
extensions=(),
optimized=True,
undefined=Undefined,
finalize=None,
autoescape=False,
loader=None,
cache_size=400,
auto_reload=True,
bytecode_cache=None,
enable_async=False,
):
# !!Important notice!!
# The constructor accepts quite a few arguments that should be
# passed by keyword rather than position. However it's important to
# not change the order of arguments because it's used at least
# internally in those cases:
# - spontaneous environments (i18n extension and Template)
# - unittests
# If parameter changes are required only add parameters at the end
# and don't change the arguments (or the defaults!) of the arguments
# existing already.
# lexer / parser information
self.block_start_string = block_start_string
self.block_end_string = block_end_string
self.variable_start_string = variable_start_string
self.variable_end_string = variable_end_string
self.comment_start_string = comment_start_string
self.comment_end_string = comment_end_string
self.line_statement_prefix = line_statement_prefix
self.line_comment_prefix = line_comment_prefix
self.trim_blocks = trim_blocks
self.lstrip_blocks = lstrip_blocks
self.newline_sequence = newline_sequence
self.keep_trailing_newline = keep_trailing_newline
# runtime information
self.undefined = undefined
self.optimized = optimized
self.finalize = finalize
self.autoescape = autoescape
# defaults
self.filters = DEFAULT_FILTERS.copy()
self.tests = DEFAULT_TESTS.copy()
self.globals = DEFAULT_NAMESPACE.copy()
# set the loader provided
self.loader = loader
self.cache = create_cache(cache_size)
self.bytecode_cache = bytecode_cache
self.auto_reload = auto_reload
# configurable policies
self.policies = DEFAULT_POLICIES.copy()
# load extensions
self.extensions = load_extensions(self, extensions)
self.enable_async = enable_async
self.is_async = self.enable_async and have_async_gen
if self.is_async:
# runs patch_all() to enable async support
from . import asyncsupport # noqa: F401
_environment_sanity_check(self)
def add_extension(self, extension):
"""Adds an extension after the environment was created.
.. versionadded:: 2.5
"""
self.extensions.update(load_extensions(self, [extension]))
def extend(self, **attributes):
"""Add the items to the instance of the environment if they do not exist
yet. This is used by :ref:`extensions <writing-extensions>` to register
callbacks and configuration values without breaking inheritance.
"""
for key, value in iteritems(attributes):
if not hasattr(self, key):
setattr(self, key, value)
def overlay(
self,
block_start_string=missing,
block_end_string=missing,
variable_start_string=missing,
variable_end_string=missing,
comment_start_string=missing,
comment_end_string=missing,
line_statement_prefix=missing,
line_comment_prefix=missing,
trim_blocks=missing,
lstrip_blocks=missing,
extensions=missing,
optimized=missing,
undefined=missing,
finalize=missing,
autoescape=missing,
loader=missing,
cache_size=missing,
auto_reload=missing,
bytecode_cache=missing,
):
"""Create a new overlay environment that shares all the data with the
current environment except for cache and the overridden attributes.
Extensions cannot be removed for an overlayed environment. An overlayed
environment automatically gets all the extensions of the environment it
is linked to plus optional extra extensions.
Creating overlays should happen after the initial environment was set
up completely. Not all attributes are truly linked, some are just
copied over so modifications on the original environment may not shine
through.
"""
args = dict(locals())
del args["self"], args["cache_size"], args["extensions"]
rv = object.__new__(self.__class__)
rv.__dict__.update(self.__dict__)
rv.overlayed = True
rv.linked_to = self
for key, value in iteritems(args):
if value is not missing:
setattr(rv, key, value)
if cache_size is not missing:
rv.cache = create_cache(cache_size)
else:
rv.cache = copy_cache(self.cache)
rv.extensions = {}
for key, value in iteritems(self.extensions):
rv.extensions[key] = value.bind(rv)
if extensions is not missing:
rv.extensions.update(load_extensions(rv, extensions))
return _environment_sanity_check(rv)
lexer = property(get_lexer, doc="The lexer for this environment.")
def iter_extensions(self):
"""Iterates over the extensions by priority."""
return iter(sorted(self.extensions.values(), key=lambda x: x.priority))
def getitem(self, obj, argument):
"""Get an item or attribute of an object but prefer the item."""
try:
return obj[argument]
except (AttributeError, TypeError, LookupError):
if isinstance(argument, string_types):
try:
attr = str(argument)
except Exception:
pass
else:
try:
return getattr(obj, attr)
except AttributeError:
pass
return self.undefined(obj=obj, name=argument)
def getattr(self, obj, attribute):
"""Get an item or attribute of an object but prefer the attribute.
Unlike :meth:`getitem` the attribute *must* be a bytestring.
"""
try:
return getattr(obj, attribute)
except AttributeError:
pass
try:
return obj[attribute]
except (TypeError, LookupError, AttributeError):
return self.undefined(obj=obj, name=attribute)
def call_filter(
self, name, value, args=None, kwargs=None, context=None, eval_ctx=None
):
"""Invokes a filter on a value the same way the compiler does it.
Note that on Python 3 this might return a coroutine in case the
filter is running from an environment in async mode and the filter
supports async execution. It's your responsibility to await this
if needed.
.. versionadded:: 2.7
"""
func = self.filters.get(name)
if func is None:
fail_for_missing_callable("no filter named %r", name)
args = [value] + list(args or ())
if getattr(func, "contextfilter", False) is True:
if context is None:
raise TemplateRuntimeError(
"Attempted to invoke context filter without context"
)
args.insert(0, context)
elif getattr(func, "evalcontextfilter", False) is True:
if eval_ctx is None:
if context is not None:
eval_ctx = context.eval_ctx
else:
eval_ctx = EvalContext(self)
args.insert(0, eval_ctx)
elif getattr(func, "environmentfilter", False) is True:
args.insert(0, self)
return func(*args, **(kwargs or {}))
def call_test(self, name, value, args=None, kwargs=None):
"""Invokes a test on a value the same way the compiler does it.
.. versionadded:: 2.7
"""
func = self.tests.get(name)
if func is None:
fail_for_missing_callable("no test named %r", name)
return func(value, *(args or ()), **(kwargs or {}))
@internalcode
def parse(self, source, name=None, filename=None):
"""Parse the sourcecode and return the abstract syntax tree. This
tree of nodes is used by the compiler to convert the template into
executable source- or bytecode. This is useful for debugging or to
extract information from templates.
If you are :ref:`developing Jinja extensions <writing-extensions>`
this gives you a good overview of the node tree generated.
"""
try:
return self._parse(source, name, filename)
except TemplateSyntaxError:
self.handle_exception(source=source)
def _parse(self, source, name, filename):
"""Internal parsing function used by `parse` and `compile`."""
return Parser(self, source, name, encode_filename(filename)).parse()
def lex(self, source, name=None, filename=None):
"""Lex the given sourcecode and return a generator that yields
tokens as tuples in the form ``(lineno, token_type, value)``.
This can be useful for :ref:`extension development <writing-extensions>`
and debugging templates.
This does not perform preprocessing. If you want the preprocessing
of the extensions to be applied you have to filter source through
the :meth:`preprocess` method.
"""
source = text_type(source)
try:
return self.lexer.tokeniter(source, name, filename)
except TemplateSyntaxError:
self.handle_exception(source=source)
def preprocess(self, source, name=None, filename=None):
"""Preprocesses the source with all extensions. This is automatically
called for all parsing and compiling methods but *not* for :meth:`lex`
because there you usually only want the actual source tokenized.
"""
return reduce(
lambda s, e: e.preprocess(s, name, filename),
self.iter_extensions(),
text_type(source),
)
def _tokenize(self, source, name, filename=None, state=None):
"""Called by the parser to do the preprocessing and filtering
for all the extensions. Returns a :class:`~jinja2.lexer.TokenStream`.
"""
source = self.preprocess(source, name, filename)
stream = self.lexer.tokenize(source, name, filename, state)
for ext in self.iter_extensions():
stream = ext.filter_stream(stream)
if not isinstance(stream, TokenStream):
stream = TokenStream(stream, name, filename)
return stream
def _generate(self, source, name, filename, defer_init=False):
"""Internal hook that can be overridden to hook a different generate
method in.
.. versionadded:: 2.5
"""
return generate(
source,
self,
name,
filename,
defer_init=defer_init,
optimized=self.optimized,
)
def _compile(self, source, filename):
"""Internal hook that can be overridden to hook a different compile
method in.
.. versionadded:: 2.5
"""
return compile(source, filename, "exec")
@internalcode
def compile(self, source, name=None, filename=None, raw=False, defer_init=False):
"""Compile a node or template source code. The `name` parameter is
the load name of the template after it was joined using
:meth:`join_path` if necessary, not the filename on the file system.
the `filename` parameter is the estimated filename of the template on
the file system. If the template came from a database or memory this
can be omitted.
The return value of this method is a python code object. If the `raw`
parameter is `True` the return value will be a string with python
code equivalent to the bytecode returned otherwise. This method is
mainly used internally.
`defer_init` is use internally to aid the module code generator. This
causes the generated code to be able to import without the global
environment variable to be set.
.. versionadded:: 2.4
`defer_init` parameter added.
"""
source_hint = None
try:
if isinstance(source, string_types):
source_hint = source
source = self._parse(source, name, filename)
source = self._generate(source, name, filename, defer_init=defer_init)
if raw:
return source
if filename is None:
filename = "<template>"
else:
filename = encode_filename(filename)
return self._compile(source, filename)
except TemplateSyntaxError:
self.handle_exception(source=source_hint)
def compile_expression(self, source, undefined_to_none=True):
"""A handy helper method that returns a callable that accepts keyword
arguments that appear as variables in the expression. If called it
returns the result of the expression.
This is useful if applications want to use the same rules as Jinja
in template "configuration files" or similar situations.
Example usage:
>>> env = Environment()
>>> expr = env.compile_expression('foo == 42')
>>> expr(foo=23)
False
>>> expr(foo=42)
True
Per default the return value is converted to `None` if the
expression returns an undefined value. This can be changed
by setting `undefined_to_none` to `False`.
>>> env.compile_expression('var')() is None
True
>>> env.compile_expression('var', undefined_to_none=False)()
Undefined
.. versionadded:: 2.1
"""
parser = Parser(self, source, state="variable")
try:
expr = parser.parse_expression()
if not parser.stream.eos:
raise TemplateSyntaxError(
"chunk after expression", parser.stream.current.lineno, None, None
)
expr.set_environment(self)
except TemplateSyntaxError:
if sys.exc_info() is not None:
self.handle_exception(source=source)
body = [nodes.Assign(nodes.Name("result", "store"), expr, lineno=1)]
template = self.from_string(nodes.Template(body, lineno=1))
return TemplateExpression(template, undefined_to_none)
def compile_templates(
self,
target,
extensions=None,
filter_func=None,
zip="deflated",
log_function=None,
ignore_errors=True,
py_compile=False,
):
"""Finds all the templates the loader can find, compiles them
and stores them in `target`. If `zip` is `None`, instead of in a
zipfile, the templates will be stored in a directory.
By default a deflate zip algorithm is used. To switch to
the stored algorithm, `zip` can be set to ``'stored'``.
`extensions` and `filter_func` are passed to :meth:`list_templates`.
Each template returned will be compiled to the target folder or
zipfile.
By default template compilation errors are ignored. In case a
log function is provided, errors are logged. If you want template
syntax errors to abort the compilation you can set `ignore_errors`
to `False` and you will get an exception on syntax errors.
If `py_compile` is set to `True` .pyc files will be written to the
target instead of standard .py files. This flag does not do anything
on pypy and Python 3 where pyc files are not picked up by itself and
don't give much benefit.
.. versionadded:: 2.4
"""
from .loaders import ModuleLoader
if log_function is None:
def log_function(x):
pass
if py_compile:
if not PY2 or PYPY:
import warnings
warnings.warn(
"'py_compile=True' has no effect on PyPy or Python"
" 3 and will be removed in version 3.0",
DeprecationWarning,
stacklevel=2,
)
py_compile = False
else:
import imp
import marshal
py_header = imp.get_magic() + u"\xff\xff\xff\xff".encode("iso-8859-15")
# Python 3.3 added a source filesize to the header
if sys.version_info >= (3, 3):
py_header += u"\x00\x00\x00\x00".encode("iso-8859-15")
def write_file(filename, data):
if zip:
info = ZipInfo(filename)
info.external_attr = 0o755 << 16
zip_file.writestr(info, data)
else:
if isinstance(data, text_type):
data = data.encode("utf8")
with open(os.path.join(target, filename), "wb") as f:
f.write(data)
if zip is not None:
from zipfile import ZipFile, ZipInfo, ZIP_DEFLATED, ZIP_STORED
zip_file = ZipFile(
target, "w", dict(deflated=ZIP_DEFLATED, stored=ZIP_STORED)[zip]
)
log_function('Compiling into Zip archive "%s"' % target)
else:
if not os.path.isdir(target):
os.makedirs(target)
log_function('Compiling into folder "%s"' % target)
try:
for name in self.list_templates(extensions, filter_func):
source, filename, _ = self.loader.get_source(self, name)
try:
code = self.compile(source, name, filename, True, True)
except TemplateSyntaxError as e:
if not ignore_errors:
raise
log_function('Could not compile "%s": %s' % (name, e))
continue
filename = ModuleLoader.get_module_filename(name)
if py_compile:
c = self._compile(code, encode_filename(filename))
write_file(filename + "c", py_header + marshal.dumps(c))
log_function('Byte-compiled "%s" as %s' % (name, filename + "c"))
else:
write_file(filename, code)
log_function('Compiled "%s" as %s' % (name, filename))
finally:
if zip:
zip_file.close()
log_function("Finished compiling templates")
def list_templates(self, extensions=None, filter_func=None):
"""Returns a list of templates for this environment. This requires
that the loader supports the loader's
:meth:`~BaseLoader.list_templates` method.
If there are other files in the template folder besides the
actual templates, the returned list can be filtered. There are two
ways: either `extensions` is set to a list of file extensions for
templates, or a `filter_func` can be provided which is a callable that
is passed a template name and should return `True` if it should end up
in the result list.
If the loader does not support that, a :exc:`TypeError` is raised.
.. versionadded:: 2.4
"""
names = self.loader.list_templates()
if extensions is not None:
if filter_func is not None:
raise TypeError(
"either extensions or filter_func can be passed, but not both"
)
def filter_func(x):
return "." in x and x.rsplit(".", 1)[1] in extensions
if filter_func is not None:
names = [name for name in names if filter_func(name)]
return names
def handle_exception(self, source=None):
"""Exception handling helper. This is used internally to either raise
rewritten exceptions or return a rendered traceback for the template.
"""
from .debug import rewrite_traceback_stack
reraise(*rewrite_traceback_stack(source=source))
def join_path(self, template, parent):
"""Join a template with the parent. By default all the lookups are
relative to the loader root so this method returns the `template`
parameter unchanged, but if the paths should be relative to the
parent template, this function can be used to calculate the real
template name.
Subclasses may override this method and implement template path
joining here.
"""
return template
@internalcode
def _load_template(self, name, globals):
if self.loader is None:
raise TypeError("no loader for this environment specified")
cache_key = (weakref.ref(self.loader), name)
if self.cache is not None:
template = self.cache.get(cache_key)
if template is not None and (
not self.auto_reload or template.is_up_to_date
):
return template
template = self.loader.load(self, name, globals)
if self.cache is not None:
self.cache[cache_key] = template
return template
@internalcode
def get_template(self, name, parent=None, globals=None):
"""Load a template from the loader. If a loader is configured this
method asks the loader for the template and returns a :class:`Template`.
If the `parent` parameter is not `None`, :meth:`join_path` is called
to get the real template name before loading.
The `globals` parameter can be used to provide template wide globals.
These variables are available in the context at render time.
If the template does not exist a :exc:`TemplateNotFound` exception is
raised.
.. versionchanged:: 2.4
If `name` is a :class:`Template` object it is returned from the
function unchanged.
"""
if isinstance(name, Template):
return name
if parent is not None:
name = self.join_path(name, parent)
return self._load_template(name, self.make_globals(globals))
@internalcode
def select_template(self, names, parent=None, globals=None):
"""Works like :meth:`get_template` but tries a number of templates
before it fails. If it cannot find any of the templates, it will
raise a :exc:`TemplatesNotFound` exception.
.. versionchanged:: 2.11
If names is :class:`Undefined`, an :exc:`UndefinedError` is
raised instead. If no templates were found and names
contains :class:`Undefined`, the message is more helpful.
.. versionchanged:: 2.4
If `names` contains a :class:`Template` object it is returned
from the function unchanged.
.. versionadded:: 2.3
"""
if isinstance(names, Undefined):
names._fail_with_undefined_error()
if not names:
raise TemplatesNotFound(
message=u"Tried to select from an empty list " u"of templates."
)
globals = self.make_globals(globals)
for name in names:
if isinstance(name, Template):
return name
if parent is not None:
name = self.join_path(name, parent)
try:
return self._load_template(name, globals)
except (TemplateNotFound, UndefinedError):
pass
raise TemplatesNotFound(names)
@internalcode
def get_or_select_template(self, template_name_or_list, parent=None, globals=None):
"""Does a typecheck and dispatches to :meth:`select_template`
if an iterable of template names is given, otherwise to
:meth:`get_template`.
.. versionadded:: 2.3
"""
if isinstance(template_name_or_list, (string_types, Undefined)):
return self.get_template(template_name_or_list, parent, globals)
elif isinstance(template_name_or_list, Template):
return template_name_or_list
return self.select_template(template_name_or_list, parent, globals)
def from_string(self, source, globals=None, template_class=None):
"""Load a template from a string. This parses the source given and
returns a :class:`Template` object.
"""
globals = self.make_globals(globals)
cls = template_class or self.template_class
return cls.from_code(self, self.compile(source), globals, None)
def make_globals(self, d):
"""Return a dict for the globals."""
if not d:
return self.globals
return dict(self.globals, **d)
class Template(object):
"""The central template object. This class represents a compiled template
and is used to evaluate it.
Normally the template object is generated from an :class:`Environment` but
it also has a constructor that makes it possible to create a template
instance directly using the constructor. It takes the same arguments as
the environment constructor but it's not possible to specify a loader.
Every template object has a few methods and members that are guaranteed
to exist. However it's important that a template object should be
considered immutable. Modifications on the object are not supported.
Template objects created from the constructor rather than an environment
do have an `environment` attribute that points to a temporary environment
that is probably shared with other templates created with the constructor
and compatible settings.
>>> template = Template('Hello {{ name }}!')
>>> template.render(name='John Doe') == u'Hello John Doe!'
True
>>> stream = template.stream(name='John Doe')
>>> next(stream) == u'Hello John Doe!'
True
>>> next(stream)
Traceback (most recent call last):
...
StopIteration
"""
#: Type of environment to create when creating a template directly
#: rather than through an existing environment.
environment_class = Environment
def __new__(
cls,
source,
block_start_string=BLOCK_START_STRING,
block_end_string=BLOCK_END_STRING,
variable_start_string=VARIABLE_START_STRING,
variable_end_string=VARIABLE_END_STRING,
comment_start_string=COMMENT_START_STRING,
comment_end_string=COMMENT_END_STRING,
line_statement_prefix=LINE_STATEMENT_PREFIX,
line_comment_prefix=LINE_COMMENT_PREFIX,
trim_blocks=TRIM_BLOCKS,
lstrip_blocks=LSTRIP_BLOCKS,
newline_sequence=NEWLINE_SEQUENCE,
keep_trailing_newline=KEEP_TRAILING_NEWLINE,
extensions=(),
optimized=True,
undefined=Undefined,
finalize=None,
autoescape=False,
enable_async=False,
):
env = get_spontaneous_environment(
cls.environment_class,
block_start_string,
block_end_string,
variable_start_string,
variable_end_string,
comment_start_string,
comment_end_string,
line_statement_prefix,
line_comment_prefix,
trim_blocks,
lstrip_blocks,
newline_sequence,
keep_trailing_newline,
frozenset(extensions),
optimized,
undefined,
finalize,
autoescape,
None,
0,
False,
None,
enable_async,
)
return env.from_string(source, template_class=cls)
@classmethod
def from_code(cls, environment, code, globals, uptodate=None):
"""Creates a template object from compiled code and the globals. This
is used by the loaders and environment to create a template object.
"""
namespace = {"environment": environment, "__file__": code.co_filename}
exec(code, namespace)
rv = cls._from_namespace(environment, namespace, globals)
rv._uptodate = uptodate
return rv
@classmethod
def from_module_dict(cls, environment, module_dict, globals):
"""Creates a template object from a module. This is used by the
module loader to create a template object.
.. versionadded:: 2.4
"""
return cls._from_namespace(environment, module_dict, globals)
@classmethod
def _from_namespace(cls, environment, namespace, globals):
t = object.__new__(cls)
t.environment = environment
t.globals = globals
t.name = namespace["name"]
t.filename = namespace["__file__"]
t.blocks = namespace["blocks"]
# render function and module
t.root_render_func = namespace["root"]
t._module = None
# debug and loader helpers
t._debug_info = namespace["debug_info"]
t._uptodate = None
# store the reference
namespace["environment"] = environment
namespace["__jinja_template__"] = t
return t
def render(self, *args, **kwargs):
"""This method accepts the same arguments as the `dict` constructor:
A dict, a dict subclass or some keyword arguments. If no arguments
are given the context will be empty. These two calls do the same::
template.render(knights='that say nih')
template.render({'knights': 'that say nih'})
This will return the rendered template as unicode string.
"""
vars = dict(*args, **kwargs)
try:
return concat(self.root_render_func(self.new_context(vars)))
except Exception:
self.environment.handle_exception()
def render_async(self, *args, **kwargs):
"""This works similar to :meth:`render` but returns a coroutine
that when awaited returns the entire rendered template string. This
requires the async feature to be enabled.
Example usage::
await template.render_async(knights='that say nih; asynchronously')
"""
# see asyncsupport for the actual implementation
raise NotImplementedError(
"This feature is not available for this version of Python"
)
def stream(self, *args, **kwargs):
"""Works exactly like :meth:`generate` but returns a
:class:`TemplateStream`.
"""
return TemplateStream(self.generate(*args, **kwargs))
def generate(self, *args, **kwargs):
"""For very large templates it can be useful to not render the whole
template at once but evaluate each statement after another and yield
piece for piece. This method basically does exactly that and returns
a generator that yields one item after another as unicode strings.
It accepts the same arguments as :meth:`render`.
"""
vars = dict(*args, **kwargs)
try:
for event in self.root_render_func(self.new_context(vars)):
yield event
except Exception:
yield self.environment.handle_exception()
def generate_async(self, *args, **kwargs):
"""An async version of :meth:`generate`. Works very similarly but
returns an async iterator instead.
"""
# see asyncsupport for the actual implementation
raise NotImplementedError(
"This feature is not available for this version of Python"
)
def new_context(self, vars=None, shared=False, locals=None):
"""Create a new :class:`Context` for this template. The vars
provided will be passed to the template. Per default the globals
are added to the context. If shared is set to `True` the data
is passed as is to the context without adding the globals.
`locals` can be a dict of local variables for internal usage.
"""
return new_context(
self.environment, self.name, self.blocks, vars, shared, self.globals, locals
)
def make_module(self, vars=None, shared=False, locals=None):
"""This method works like the :attr:`module` attribute when called
without arguments but it will evaluate the template on every call
rather than caching it. It's also possible to provide
a dict which is then used as context. The arguments are the same
as for the :meth:`new_context` method.
"""
return TemplateModule(self, self.new_context(vars, shared, locals))
def make_module_async(self, vars=None, shared=False, locals=None):
"""As template module creation can invoke template code for
asynchronous executions this method must be used instead of the
normal :meth:`make_module` one. Likewise the module attribute
becomes unavailable in async mode.
"""
# see asyncsupport for the actual implementation
raise NotImplementedError(
"This feature is not available for this version of Python"
)
@internalcode
def _get_default_module(self):
if self._module is not None:
return self._module
self._module = rv = self.make_module()
return rv
@property
def module(self):
"""The template as module. This is used for imports in the
template runtime but is also useful if one wants to access
exported template variables from the Python layer:
>>> t = Template('{% macro foo() %}42{% endmacro %}23')
>>> str(t.module)
'23'
>>> t.module.foo() == u'42'
True
This attribute is not available if async mode is enabled.
"""
return self._get_default_module()
def get_corresponding_lineno(self, lineno):
"""Return the source line number of a line number in the
generated bytecode as they are not in sync.
"""
for template_line, code_line in reversed(self.debug_info):
if code_line <= lineno:
return template_line
return 1
@property
def is_up_to_date(self):
"""If this variable is `False` there is a newer version available."""
if self._uptodate is None:
return True
return self._uptodate()
@property
def debug_info(self):
"""The debug info mapping."""
if self._debug_info:
return [tuple(map(int, x.split("="))) for x in self._debug_info.split("&")]
return []
def __repr__(self):
if self.name is None:
name = "memory:%x" % id(self)
else:
name = repr(self.name)
return "<%s %s>" % (self.__class__.__name__, name)
@implements_to_string
class TemplateModule(object):
"""Represents an imported template. All the exported names of the
template are available as attributes on this object. Additionally
converting it into an unicode- or bytestrings renders the contents.
"""
def __init__(self, template, context, body_stream=None):
if body_stream is None:
if context.environment.is_async:
raise RuntimeError(
"Async mode requires a body stream "
"to be passed to a template module. Use "
"the async methods of the API you are "
"using."
)
body_stream = list(template.root_render_func(context))
self._body_stream = body_stream
self.__dict__.update(context.get_exported())
self.__name__ = template.name
def __html__(self):
return Markup(concat(self._body_stream))
def __str__(self):
return concat(self._body_stream)
def __repr__(self):
if self.__name__ is None:
name = "memory:%x" % id(self)
else:
name = repr(self.__name__)
return "<%s %s>" % (self.__class__.__name__, name)
class TemplateExpression(object):
"""The :meth:`jinja2.Environment.compile_expression` method returns an
instance of this object. It encapsulates the expression-like access
to the template with an expression it wraps.
"""
def __init__(self, template, undefined_to_none):
self._template = template
self._undefined_to_none = undefined_to_none
def __call__(self, *args, **kwargs):
context = self._template.new_context(dict(*args, **kwargs))
consume(self._template.root_render_func(context))
rv = context.vars["result"]
if self._undefined_to_none and isinstance(rv, Undefined):
rv = None
return rv
@implements_iterator
class TemplateStream(object):
"""A template stream works pretty much like an ordinary python generator
but it can buffer multiple items to reduce the number of total iterations.
Per default the output is unbuffered which means that for every unbuffered
instruction in the template one unicode string is yielded.
If buffering is enabled with a buffer size of 5, five items are combined
into a new unicode string. This is mainly useful if you are streaming
big templates to a client via WSGI which flushes after each iteration.
"""
def __init__(self, gen):
self._gen = gen
self.disable_buffering()
def dump(self, fp, encoding=None, errors="strict"):
"""Dump the complete stream into a file or file-like object.
Per default unicode strings are written, if you want to encode
before writing specify an `encoding`.
Example usage::
Template('Hello {{ name }}!').stream(name='foo').dump('hello.html')
"""
close = False
if isinstance(fp, string_types):
if encoding is None:
encoding = "utf-8"
fp = open(fp, "wb")
close = True
try:
if encoding is not None:
iterable = (x.encode(encoding, errors) for x in self)
else:
iterable = self
if hasattr(fp, "writelines"):
fp.writelines(iterable)
else:
for item in iterable:
fp.write(item)
finally:
if close:
fp.close()
def disable_buffering(self):
"""Disable the output buffering."""
self._next = partial(next, self._gen)
self.buffered = False
def _buffered_generator(self, size):
buf = []
c_size = 0
push = buf.append
while 1:
try:
while c_size < size:
c = next(self._gen)
push(c)
if c:
c_size += 1
except StopIteration:
if not c_size:
return
yield concat(buf)
del buf[:]
c_size = 0
def enable_buffering(self, size=5):
"""Enable buffering. Buffer `size` items before yielding them."""
if size <= 1:
raise ValueError("buffer size too small")
self.buffered = True
self._next = partial(next, self._buffered_generator(size))
def __iter__(self):
return self
def __next__(self):
return self._next()
# hook in default template class. if anyone reads this comment: ignore that
# it's possible to use custom templates ;-)
Environment.template_class = Template
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/_identifier.py
|
import re
# generated by scripts/generate_identifier_pattern.py
pattern = re.compile(
r"[\w·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-ٰٟۖ-ۜ۟-۪ۤۧۨ-ܑۭܰ-݊ަ-ް߫-߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛ࣔ-ࣣ࣡-ःऺ-़ा-ॏ॑-ॗॢॣঁ-ঃ়া-ৄেৈো-্ৗৢৣਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑੰੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣஂா-ூெ-ைொ-்ௗఀ-ఃా-ౄె-ైొ-్ౕౖౢౣಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣഁ-ഃാ-ൄെ-ൈൊ-്ൗൢൣංඃ්ා-ුූෘ-ෟෲෳัิ-ฺ็-๎ັິ-ູົຼ່-ໍ༹༘༙༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏႚ-ႝ፝-፟ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝᠋-᠍ᢅᢆᢩᤠ-ᤫᤰ-᤻ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼᪰-᪽ᬀ-ᬄ᬴-᭄᭫-᭳ᮀ-ᮂᮡ-ᮭ᯦-᯳ᰤ-᰷᳐-᳔᳒-᳨᳭ᳲ-᳴᳸᳹᷀-᷵᷻-᷿‿⁀⁔⃐-⃥⃜⃡-⃰℘℮⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꙯ꙴ-꙽ꚞꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-ꣅ꣠-꣱ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀ꧥꨩ-ꨶꩃꩌꩍꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭ﬞ︀-️︠-︯︳︴﹍-﹏＿𐇽𐋠𐍶-𐍺𐨁-𐨃𐨅𐨆𐨌-𐨏𐨸-𐨿𐨺𐫦𐫥𑀀-𑀂𑀸-𑁆𑁿-𑂂𑂰-𑂺𑄀-𑄂𑄧-𑅳𑄴𑆀-𑆂𑆳-𑇊𑇀-𑇌𑈬-𑈷𑈾𑋟-𑋪𑌀-𑌃𑌼𑌾-𑍄𑍇𑍈𑍋-𑍍𑍗𑍢𑍣𑍦-𑍬𑍰-𑍴𑐵-𑑆𑒰-𑓃𑖯-𑖵𑖸-𑗀𑗜𑗝𑘰-𑙀𑚫-𑚷𑜝-𑜫𑰯-𑰶𑰸-𑰿𑲒-𑲧𑲩-𑲶𖫰-𖫴𖬰-𖬶𖽑-𖽾𖾏-𖾒𛲝𛲞𝅥-𝅩𝅭-𝅲𝅻-𝆂𝆅-𝆋𝆪-𝆭𝉂-𝉄𝨀-𝨶𝨻-𝩬𝩵𝪄𝪛-𝪟𝪡-𝪯𞀀-𞀆𞀈-𞀘𞀛-𞀡𞀣𞀤𞀦-𞣐𞀪-𞣖𞥄-𞥊󠄀-󠇯]+" # noqa: B950
)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/optimizer.py
|
# -*- coding: utf-8 -*-
"""The optimizer tries to constant fold expressions and modify the AST
in place so that it should be faster to evaluate.
Because the AST does not contain all the scoping information and the
compiler has to find that out, we cannot do all the optimizations we
want. For example, loop unrolling doesn't work because unrolled loops
would have a different scope. The solution would be a second syntax tree
that stored the scoping rules.
"""
from . import nodes
from .visitor import NodeTransformer
def optimize(node, environment):
"""The context hint can be used to perform an static optimization
based on the context given."""
optimizer = Optimizer(environment)
return optimizer.visit(node)
class Optimizer(NodeTransformer):
def __init__(self, environment):
self.environment = environment
def generic_visit(self, node, *args, **kwargs):
node = super(Optimizer, self).generic_visit(node, *args, **kwargs)
# Do constant folding. Some other nodes besides Expr have
# as_const, but folding them causes errors later on.
if isinstance(node, nodes.Expr):
try:
return nodes.Const.from_untrusted(
node.as_const(args[0] if args else None),
lineno=node.lineno,
environment=self.environment,
)
except nodes.Impossible:
pass
return node
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/exceptions.py
|
# -*- coding: utf-8 -*-
from ._compat import imap
from ._compat import implements_to_string
from ._compat import PY2
from ._compat import text_type
class TemplateError(Exception):
"""Baseclass for all template errors."""
if PY2:
def __init__(self, message=None):
if message is not None:
message = text_type(message).encode("utf-8")
Exception.__init__(self, message)
@property
def message(self):
if self.args:
message = self.args[0]
if message is not None:
return message.decode("utf-8", "replace")
def __unicode__(self):
return self.message or u""
else:
def __init__(self, message=None):
Exception.__init__(self, message)
@property
def message(self):
if self.args:
message = self.args[0]
if message is not None:
return message
@implements_to_string
class TemplateNotFound(IOError, LookupError, TemplateError):
"""Raised if a template does not exist.
.. versionchanged:: 2.11
If the given name is :class:`Undefined` and no message was
provided, an :exc:`UndefinedError` is raised.
"""
# looks weird, but removes the warning descriptor that just
# bogusly warns us about message being deprecated
message = None
def __init__(self, name, message=None):
IOError.__init__(self, name)
if message is None:
from .runtime import Undefined
if isinstance(name, Undefined):
name._fail_with_undefined_error()
message = name
self.message = message
self.name = name
self.templates = [name]
def __str__(self):
return self.message
class TemplatesNotFound(TemplateNotFound):
"""Like :class:`TemplateNotFound` but raised if multiple templates
are selected. This is a subclass of :class:`TemplateNotFound`
exception, so just catching the base exception will catch both.
.. versionchanged:: 2.11
If a name in the list of names is :class:`Undefined`, a message
about it being undefined is shown rather than the empty string.
.. versionadded:: 2.2
"""
def __init__(self, names=(), message=None):
if message is None:
from .runtime import Undefined
parts = []
for name in names:
if isinstance(name, Undefined):
parts.append(name._undefined_message)
else:
parts.append(name)
message = u"none of the templates given were found: " + u", ".join(
imap(text_type, parts)
)
TemplateNotFound.__init__(self, names and names[-1] or None, message)
self.templates = list(names)
@implements_to_string
class TemplateSyntaxError(TemplateError):
"""Raised to tell the user that there is a problem with the template."""
def __init__(self, message, lineno, name=None, filename=None):
TemplateError.__init__(self, message)
self.lineno = lineno
self.name = name
self.filename = filename
self.source = None
# this is set to True if the debug.translate_syntax_error
# function translated the syntax error into a new traceback
self.translated = False
def __str__(self):
# for translated errors we only return the message
if self.translated:
return self.message
# otherwise attach some stuff
location = "line %d" % self.lineno
name = self.filename or self.name
if name:
location = 'File "%s", %s' % (name, location)
lines = [self.message, " " + location]
# if the source is set, add the line to the output
if self.source is not None:
try:
line = self.source.splitlines()[self.lineno - 1]
except IndexError:
line = None
if line:
lines.append(" " + line.strip())
return u"\n".join(lines)
def __reduce__(self):
# https://bugs.python.org/issue1692335 Exceptions that take
# multiple required arguments have problems with pickling.
# Without this, raises TypeError: __init__() missing 1 required
# positional argument: 'lineno'
return self.__class__, (self.message, self.lineno, self.name, self.filename)
class TemplateAssertionError(TemplateSyntaxError):
"""Like a template syntax error, but covers cases where something in the
template caused an error at compile time that wasn't necessarily caused
by a syntax error. However it's a direct subclass of
:exc:`TemplateSyntaxError` and has the same attributes.
"""
class TemplateRuntimeError(TemplateError):
"""A generic runtime error in the template engine. Under some situations
Jinja may raise this exception.
"""
class UndefinedError(TemplateRuntimeError):
"""Raised if a template tries to operate on :class:`Undefined`."""
class SecurityError(TemplateRuntimeError):
"""Raised if a template tries to do something insecure if the
sandbox is enabled.
"""
class FilterArgumentError(TemplateRuntimeError):
"""This error is raised if a filter was called with inappropriate
arguments
"""
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/defaults.py
|
# -*- coding: utf-8 -*-
from ._compat import range_type
from .filters import FILTERS as DEFAULT_FILTERS # noqa: F401
from .tests import TESTS as DEFAULT_TESTS # noqa: F401
from .utils import Cycler
from .utils import generate_lorem_ipsum
from .utils import Joiner
from .utils import Namespace
# defaults for the parser / lexer
BLOCK_START_STRING = "{%"
BLOCK_END_STRING = "%}"
VARIABLE_START_STRING = "{{"
VARIABLE_END_STRING = "}}"
COMMENT_START_STRING = "{#"
COMMENT_END_STRING = "#}"
LINE_STATEMENT_PREFIX = None
LINE_COMMENT_PREFIX = None
TRIM_BLOCKS = False
LSTRIP_BLOCKS = False
NEWLINE_SEQUENCE = "\n"
KEEP_TRAILING_NEWLINE = False
# default filters, tests and namespace
DEFAULT_NAMESPACE = {
"range": range_type,
"dict": dict,
"lipsum": generate_lorem_ipsum,
"cycler": Cycler,
"joiner": Joiner,
"namespace": Namespace,
}
# default policies
DEFAULT_POLICIES = {
"compiler.ascii_str": True,
"urlize.rel": "noopener",
"urlize.target": None,
"truncate.leeway": 5,
"json.dumps_function": None,
"json.dumps_kwargs": {"sort_keys": True},
"ext.i18n.trimmed": False,
}
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/nativetypes.py
|
from ast import literal_eval
from itertools import chain
from itertools import islice
from . import nodes
from ._compat import text_type
from .compiler import CodeGenerator
from .compiler import has_safe_repr
from .environment import Environment
from .environment import Template
def native_concat(nodes):
"""Return a native Python type from the list of compiled nodes. If
the result is a single node, its value is returned. Otherwise, the
nodes are concatenated as strings. If the result can be parsed with
:func:`ast.literal_eval`, the parsed value is returned. Otherwise,
the string is returned.
:param nodes: Iterable of nodes to concatenate.
"""
head = list(islice(nodes, 2))
if not head:
return None
if len(head) == 1:
raw = head[0]
else:
raw = u"".join([text_type(v) for v in chain(head, nodes)])
try:
return literal_eval(raw)
except (ValueError, SyntaxError, MemoryError):
return raw
class NativeCodeGenerator(CodeGenerator):
"""A code generator which renders Python types by not adding
``to_string()`` around output nodes.
"""
@staticmethod
def _default_finalize(value):
return value
def _output_const_repr(self, group):
return repr(u"".join([text_type(v) for v in group]))
def _output_child_to_const(self, node, frame, finalize):
const = node.as_const(frame.eval_ctx)
if not has_safe_repr(const):
raise nodes.Impossible()
if isinstance(node, nodes.TemplateData):
return const
return finalize.const(const)
def _output_child_pre(self, node, frame, finalize):
if finalize.src is not None:
self.write(finalize.src)
def _output_child_post(self, node, frame, finalize):
if finalize.src is not None:
self.write(")")
class NativeEnvironment(Environment):
"""An environment that renders templates to native Python types."""
code_generator_class = NativeCodeGenerator
class NativeTemplate(Template):
environment_class = NativeEnvironment
def render(self, *args, **kwargs):
"""Render the template to produce a native Python type. If the
result is a single node, its value is returned. Otherwise, the
nodes are concatenated as strings. If the result can be parsed
with :func:`ast.literal_eval`, the parsed value is returned.
Otherwise, the string is returned.
"""
vars = dict(*args, **kwargs)
try:
return native_concat(self.root_render_func(self.new_context(vars)))
except Exception:
return self.environment.handle_exception()
NativeEnvironment.template_class = NativeTemplate
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/_compat.py
|
# -*- coding: utf-8 -*-
# flake8: noqa
import marshal
import sys
PY2 = sys.version_info[0] == 2
PYPY = hasattr(sys, "pypy_translation_info")
_identity = lambda x: x
if not PY2:
unichr = chr
range_type = range
text_type = str
string_types = (str,)
integer_types = (int,)
iterkeys = lambda d: iter(d.keys())
itervalues = lambda d: iter(d.values())
iteritems = lambda d: iter(d.items())
import pickle
from io import BytesIO, StringIO
NativeStringIO = StringIO
def reraise(tp, value, tb=None):
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
ifilter = filter
imap = map
izip = zip
intern = sys.intern
implements_iterator = _identity
implements_to_string = _identity
encode_filename = _identity
marshal_dump = marshal.dump
marshal_load = marshal.load
else:
unichr = unichr
text_type = unicode
range_type = xrange
string_types = (str, unicode)
integer_types = (int, long)
iterkeys = lambda d: d.iterkeys()
itervalues = lambda d: d.itervalues()
iteritems = lambda d: d.iteritems()
import cPickle as pickle
from cStringIO import StringIO as BytesIO, StringIO
NativeStringIO = BytesIO
exec("def reraise(tp, value, tb=None):\n raise tp, value, tb")
from itertools import imap, izip, ifilter
intern = intern
def implements_iterator(cls):
cls.next = cls.__next__
del cls.__next__
return cls
def implements_to_string(cls):
cls.__unicode__ = cls.__str__
cls.__str__ = lambda x: x.__unicode__().encode("utf-8")
return cls
def encode_filename(filename):
if isinstance(filename, unicode):
return filename.encode("utf-8")
return filename
def marshal_dump(code, f):
if isinstance(f, file):
marshal.dump(code, f)
else:
f.write(marshal.dumps(code))
def marshal_load(f):
if isinstance(f, file):
return marshal.load(f)
return marshal.loads(f.read())
def with_metaclass(meta, *bases):
"""Create a base class with a metaclass."""
# This requires a bit of explanation: the basic idea is to make a
# dummy metaclass for one level of class instantiation that replaces
# itself with the actual metaclass.
class metaclass(type):
def __new__(cls, name, this_bases, d):
return meta(name, bases, d)
return type.__new__(metaclass, "temporary_class", (), {})
try:
from urllib.parse import quote_from_bytes as url_quote
except ImportError:
from urllib import quote as url_quote
try:
from collections import abc
except ImportError:
import collections as abc
try:
from os import fspath
except ImportError:
try:
from pathlib import PurePath
except ImportError:
PurePath = None
def fspath(path):
if hasattr(path, "__fspath__"):
return path.__fspath__()
# Python 3.5 doesn't have __fspath__ yet, use str.
if PurePath is not None and isinstance(path, PurePath):
return str(path)
return path
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/nodes.py
|
# -*- coding: utf-8 -*-
"""AST nodes generated by the parser for the compiler. Also provides
some node tree helper functions used by the parser and compiler in order
to normalize nodes.
"""
import operator
from collections import deque
from markupsafe import Markup
from ._compat import izip
from ._compat import PY2
from ._compat import text_type
from ._compat import with_metaclass
_binop_to_func = {
"*": operator.mul,
"/": operator.truediv,
"//": operator.floordiv,
"**": operator.pow,
"%": operator.mod,
"+": operator.add,
"-": operator.sub,
}
_uaop_to_func = {"not": operator.not_, "+": operator.pos, "-": operator.neg}
_cmpop_to_func = {
"eq": operator.eq,
"ne": operator.ne,
"gt": operator.gt,
"gteq": operator.ge,
"lt": operator.lt,
"lteq": operator.le,
"in": lambda a, b: a in b,
"notin": lambda a, b: a not in b,
}
class Impossible(Exception):
"""Raised if the node could not perform a requested action."""
class NodeType(type):
"""A metaclass for nodes that handles the field and attribute
inheritance. fields and attributes from the parent class are
automatically forwarded to the child."""
def __new__(mcs, name, bases, d):
for attr in "fields", "attributes":
storage = []
storage.extend(getattr(bases[0], attr, ()))
storage.extend(d.get(attr, ()))
assert len(bases) == 1, "multiple inheritance not allowed"
assert len(storage) == len(set(storage)), "layout conflict"
d[attr] = tuple(storage)
d.setdefault("abstract", False)
return type.__new__(mcs, name, bases, d)
class EvalContext(object):
"""Holds evaluation time information. Custom attributes can be attached
to it in extensions.
"""
def __init__(self, environment, template_name=None):
self.environment = environment
if callable(environment.autoescape):
self.autoescape = environment.autoescape(template_name)
else:
self.autoescape = environment.autoescape
self.volatile = False
def save(self):
return self.__dict__.copy()
def revert(self, old):
self.__dict__.clear()
self.__dict__.update(old)
def get_eval_context(node, ctx):
if ctx is None:
if node.environment is None:
raise RuntimeError(
"if no eval context is passed, the "
"node must have an attached "
"environment."
)
return EvalContext(node.environment)
return ctx
class Node(with_metaclass(NodeType, object)):
"""Baseclass for all Jinja nodes. There are a number of nodes available
of different types. There are four major types:
- :class:`Stmt`: statements
- :class:`Expr`: expressions
- :class:`Helper`: helper nodes
- :class:`Template`: the outermost wrapper node
All nodes have fields and attributes. Fields may be other nodes, lists,
or arbitrary values. Fields are passed to the constructor as regular
positional arguments, attributes as keyword arguments. Each node has
two attributes: `lineno` (the line number of the node) and `environment`.
The `environment` attribute is set at the end of the parsing process for
all nodes automatically.
"""
fields = ()
attributes = ("lineno", "environment")
abstract = True
def __init__(self, *fields, **attributes):
if self.abstract:
raise TypeError("abstract nodes are not instantiable")
if fields:
if len(fields) != len(self.fields):
if not self.fields:
raise TypeError("%r takes 0 arguments" % self.__class__.__name__)
raise TypeError(
"%r takes 0 or %d argument%s"
% (
self.__class__.__name__,
len(self.fields),
len(self.fields) != 1 and "s" or "",
)
)
for name, arg in izip(self.fields, fields):
setattr(self, name, arg)
for attr in self.attributes:
setattr(self, attr, attributes.pop(attr, None))
if attributes:
raise TypeError("unknown attribute %r" % next(iter(attributes)))
def iter_fields(self, exclude=None, only=None):
"""This method iterates over all fields that are defined and yields
``(key, value)`` tuples. Per default all fields are returned, but
it's possible to limit that to some fields by providing the `only`
parameter or to exclude some using the `exclude` parameter. Both
should be sets or tuples of field names.
"""
for name in self.fields:
if (
(exclude is only is None)
or (exclude is not None and name not in exclude)
or (only is not None and name in only)
):
try:
yield name, getattr(self, name)
except AttributeError:
pass
def iter_child_nodes(self, exclude=None, only=None):
"""Iterates over all direct child nodes of the node. This iterates
over all fields and yields the values of they are nodes. If the value
of a field is a list all the nodes in that list are returned.
"""
for _, item in self.iter_fields(exclude, only):
if isinstance(item, list):
for n in item:
if isinstance(n, Node):
yield n
elif isinstance(item, Node):
yield item
def find(self, node_type):
"""Find the first node of a given type. If no such node exists the
return value is `None`.
"""
for result in self.find_all(node_type):
return result
def find_all(self, node_type):
"""Find all the nodes of a given type. If the type is a tuple,
the check is performed for any of the tuple items.
"""
for child in self.iter_child_nodes():
if isinstance(child, node_type):
yield child
for result in child.find_all(node_type):
yield result
def set_ctx(self, ctx):
"""Reset the context of a node and all child nodes. Per default the
parser will all generate nodes that have a 'load' context as it's the
most common one. This method is used in the parser to set assignment
targets and other nodes to a store context.
"""
todo = deque([self])
while todo:
node = todo.popleft()
if "ctx" in node.fields:
node.ctx = ctx
todo.extend(node.iter_child_nodes())
return self
def set_lineno(self, lineno, override=False):
"""Set the line numbers of the node and children."""
todo = deque([self])
while todo:
node = todo.popleft()
if "lineno" in node.attributes:
if node.lineno is None or override:
node.lineno = lineno
todo.extend(node.iter_child_nodes())
return self
def set_environment(self, environment):
"""Set the environment for all nodes."""
todo = deque([self])
while todo:
node = todo.popleft()
node.environment = environment
todo.extend(node.iter_child_nodes())
return self
def __eq__(self, other):
return type(self) is type(other) and tuple(self.iter_fields()) == tuple(
other.iter_fields()
)
def __ne__(self, other):
return not self.__eq__(other)
# Restore Python 2 hashing behavior on Python 3
__hash__ = object.__hash__
def __repr__(self):
return "%s(%s)" % (
self.__class__.__name__,
", ".join("%s=%r" % (arg, getattr(self, arg, None)) for arg in self.fields),
)
def dump(self):
def _dump(node):
if not isinstance(node, Node):
buf.append(repr(node))
return
buf.append("nodes.%s(" % node.__class__.__name__)
if not node.fields:
buf.append(")")
return
for idx, field in enumerate(node.fields):
if idx:
buf.append(", ")
value = getattr(node, field)
if isinstance(value, list):
buf.append("[")
for idx, item in enumerate(value):
if idx:
buf.append(", ")
_dump(item)
buf.append("]")
else:
_dump(value)
buf.append(")")
buf = []
_dump(self)
return "".join(buf)
class Stmt(Node):
"""Base node for all statements."""
abstract = True
class Helper(Node):
"""Nodes that exist in a specific context only."""
abstract = True
class Template(Node):
"""Node that represents a template. This must be the outermost node that
is passed to the compiler.
"""
fields = ("body",)
class Output(Stmt):
"""A node that holds multiple expressions which are then printed out.
This is used both for the `print` statement and the regular template data.
"""
fields = ("nodes",)
class Extends(Stmt):
"""Represents an extends statement."""
fields = ("template",)
class For(Stmt):
"""The for loop. `target` is the target for the iteration (usually a
:class:`Name` or :class:`Tuple`), `iter` the iterable. `body` is a list
of nodes that are used as loop-body, and `else_` a list of nodes for the
`else` block. If no else node exists it has to be an empty list.
For filtered nodes an expression can be stored as `test`, otherwise `None`.
"""
fields = ("target", "iter", "body", "else_", "test", "recursive")
class If(Stmt):
"""If `test` is true, `body` is rendered, else `else_`."""
fields = ("test", "body", "elif_", "else_")
class Macro(Stmt):
"""A macro definition. `name` is the name of the macro, `args` a list of
arguments and `defaults` a list of defaults if there are any. `body` is
a list of nodes for the macro body.
"""
fields = ("name", "args", "defaults", "body")
class CallBlock(Stmt):
"""Like a macro without a name but a call instead. `call` is called with
the unnamed macro as `caller` argument this node holds.
"""
fields = ("call", "args", "defaults", "body")
class FilterBlock(Stmt):
"""Node for filter sections."""
fields = ("body", "filter")
class With(Stmt):
"""Specific node for with statements. In older versions of Jinja the
with statement was implemented on the base of the `Scope` node instead.
.. versionadded:: 2.9.3
"""
fields = ("targets", "values", "body")
class Block(Stmt):
"""A node that represents a block."""
fields = ("name", "body", "scoped")
class Include(Stmt):
"""A node that represents the include tag."""
fields = ("template", "with_context", "ignore_missing")
class Import(Stmt):
"""A node that represents the import tag."""
fields = ("template", "target", "with_context")
class FromImport(Stmt):
"""A node that represents the from import tag. It's important to not
pass unsafe names to the name attribute. The compiler translates the
attribute lookups directly into getattr calls and does *not* use the
subscript callback of the interface. As exported variables may not
start with double underscores (which the parser asserts) this is not a
problem for regular Jinja code, but if this node is used in an extension
extra care must be taken.
The list of names may contain tuples if aliases are wanted.
"""
fields = ("template", "names", "with_context")
class ExprStmt(Stmt):
"""A statement that evaluates an expression and discards the result."""
fields = ("node",)
class Assign(Stmt):
"""Assigns an expression to a target."""
fields = ("target", "node")
class AssignBlock(Stmt):
"""Assigns a block to a target."""
fields = ("target", "filter", "body")
class Expr(Node):
"""Baseclass for all expressions."""
abstract = True
def as_const(self, eval_ctx=None):
"""Return the value of the expression as constant or raise
:exc:`Impossible` if this was not possible.
An :class:`EvalContext` can be provided, if none is given
a default context is created which requires the nodes to have
an attached environment.
.. versionchanged:: 2.4
the `eval_ctx` parameter was added.
"""
raise Impossible()
def can_assign(self):
"""Check if it's possible to assign something to this node."""
return False
class BinExpr(Expr):
"""Baseclass for all binary expressions."""
fields = ("left", "right")
operator = None
abstract = True
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
# intercepted operators cannot be folded at compile time
if (
self.environment.sandboxed
and self.operator in self.environment.intercepted_binops
):
raise Impossible()
f = _binop_to_func[self.operator]
try:
return f(self.left.as_const(eval_ctx), self.right.as_const(eval_ctx))
except Exception:
raise Impossible()
class UnaryExpr(Expr):
"""Baseclass for all unary expressions."""
fields = ("node",)
operator = None
abstract = True
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
# intercepted operators cannot be folded at compile time
if (
self.environment.sandboxed
and self.operator in self.environment.intercepted_unops
):
raise Impossible()
f = _uaop_to_func[self.operator]
try:
return f(self.node.as_const(eval_ctx))
except Exception:
raise Impossible()
class Name(Expr):
"""Looks up a name or stores a value in a name.
The `ctx` of the node can be one of the following values:
- `store`: store a value in the name
- `load`: load that name
- `param`: like `store` but if the name was defined as function parameter.
"""
fields = ("name", "ctx")
def can_assign(self):
return self.name not in ("true", "false", "none", "True", "False", "None")
class NSRef(Expr):
"""Reference to a namespace value assignment"""
fields = ("name", "attr")
def can_assign(self):
# We don't need any special checks here; NSRef assignments have a
# runtime check to ensure the target is a namespace object which will
# have been checked already as it is created using a normal assignment
# which goes through a `Name` node.
return True
class Literal(Expr):
"""Baseclass for literals."""
abstract = True
class Const(Literal):
"""All constant values. The parser will return this node for simple
constants such as ``42`` or ``"foo"`` but it can be used to store more
complex values such as lists too. Only constants with a safe
representation (objects where ``eval(repr(x)) == x`` is true).
"""
fields = ("value",)
def as_const(self, eval_ctx=None):
rv = self.value
if (
PY2
and type(rv) is text_type
and self.environment.policies["compiler.ascii_str"]
):
try:
rv = rv.encode("ascii")
except UnicodeError:
pass
return rv
@classmethod
def from_untrusted(cls, value, lineno=None, environment=None):
"""Return a const object if the value is representable as
constant value in the generated code, otherwise it will raise
an `Impossible` exception.
"""
from .compiler import has_safe_repr
if not has_safe_repr(value):
raise Impossible()
return cls(value, lineno=lineno, environment=environment)
class TemplateData(Literal):
"""A constant template string."""
fields = ("data",)
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
if eval_ctx.volatile:
raise Impossible()
if eval_ctx.autoescape:
return Markup(self.data)
return self.data
class Tuple(Literal):
"""For loop unpacking and some other things like multiple arguments
for subscripts. Like for :class:`Name` `ctx` specifies if the tuple
is used for loading the names or storing.
"""
fields = ("items", "ctx")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return tuple(x.as_const(eval_ctx) for x in self.items)
def can_assign(self):
for item in self.items:
if not item.can_assign():
return False
return True
class List(Literal):
"""Any list literal such as ``[1, 2, 3]``"""
fields = ("items",)
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return [x.as_const(eval_ctx) for x in self.items]
class Dict(Literal):
"""Any dict literal such as ``{1: 2, 3: 4}``. The items must be a list of
:class:`Pair` nodes.
"""
fields = ("items",)
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return dict(x.as_const(eval_ctx) for x in self.items)
class Pair(Helper):
"""A key, value pair for dicts."""
fields = ("key", "value")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return self.key.as_const(eval_ctx), self.value.as_const(eval_ctx)
class Keyword(Helper):
"""A key, value pair for keyword arguments where key is a string."""
fields = ("key", "value")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return self.key, self.value.as_const(eval_ctx)
class CondExpr(Expr):
"""A conditional expression (inline if expression). (``{{
foo if bar else baz }}``)
"""
fields = ("test", "expr1", "expr2")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
if self.test.as_const(eval_ctx):
return self.expr1.as_const(eval_ctx)
# if we evaluate to an undefined object, we better do that at runtime
if self.expr2 is None:
raise Impossible()
return self.expr2.as_const(eval_ctx)
def args_as_const(node, eval_ctx):
args = [x.as_const(eval_ctx) for x in node.args]
kwargs = dict(x.as_const(eval_ctx) for x in node.kwargs)
if node.dyn_args is not None:
try:
args.extend(node.dyn_args.as_const(eval_ctx))
except Exception:
raise Impossible()
if node.dyn_kwargs is not None:
try:
kwargs.update(node.dyn_kwargs.as_const(eval_ctx))
except Exception:
raise Impossible()
return args, kwargs
class Filter(Expr):
"""This node applies a filter on an expression. `name` is the name of
the filter, the rest of the fields are the same as for :class:`Call`.
If the `node` of a filter is `None` the contents of the last buffer are
filtered. Buffers are created by macros and filter blocks.
"""
fields = ("node", "name", "args", "kwargs", "dyn_args", "dyn_kwargs")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
if eval_ctx.volatile or self.node is None:
raise Impossible()
# we have to be careful here because we call filter_ below.
# if this variable would be called filter, 2to3 would wrap the
# call in a list because it is assuming we are talking about the
# builtin filter function here which no longer returns a list in
# python 3. because of that, do not rename filter_ to filter!
filter_ = self.environment.filters.get(self.name)
if filter_ is None or getattr(filter_, "contextfilter", False) is True:
raise Impossible()
# We cannot constant handle async filters, so we need to make sure
# to not go down this path.
if eval_ctx.environment.is_async and getattr(
filter_, "asyncfiltervariant", False
):
raise Impossible()
args, kwargs = args_as_const(self, eval_ctx)
args.insert(0, self.node.as_const(eval_ctx))
if getattr(filter_, "evalcontextfilter", False) is True:
args.insert(0, eval_ctx)
elif getattr(filter_, "environmentfilter", False) is True:
args.insert(0, self.environment)
try:
return filter_(*args, **kwargs)
except Exception:
raise Impossible()
class Test(Expr):
"""Applies a test on an expression. `name` is the name of the test, the
rest of the fields are the same as for :class:`Call`.
"""
fields = ("node", "name", "args", "kwargs", "dyn_args", "dyn_kwargs")
def as_const(self, eval_ctx=None):
test = self.environment.tests.get(self.name)
if test is None:
raise Impossible()
eval_ctx = get_eval_context(self, eval_ctx)
args, kwargs = args_as_const(self, eval_ctx)
args.insert(0, self.node.as_const(eval_ctx))
try:
return test(*args, **kwargs)
except Exception:
raise Impossible()
class Call(Expr):
"""Calls an expression. `args` is a list of arguments, `kwargs` a list
of keyword arguments (list of :class:`Keyword` nodes), and `dyn_args`
and `dyn_kwargs` has to be either `None` or a node that is used as
node for dynamic positional (``*args``) or keyword (``**kwargs``)
arguments.
"""
fields = ("node", "args", "kwargs", "dyn_args", "dyn_kwargs")
class Getitem(Expr):
"""Get an attribute or item from an expression and prefer the item."""
fields = ("node", "arg", "ctx")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
if self.ctx != "load":
raise Impossible()
try:
return self.environment.getitem(
self.node.as_const(eval_ctx), self.arg.as_const(eval_ctx)
)
except Exception:
raise Impossible()
def can_assign(self):
return False
class Getattr(Expr):
"""Get an attribute or item from an expression that is a ascii-only
bytestring and prefer the attribute.
"""
fields = ("node", "attr", "ctx")
def as_const(self, eval_ctx=None):
if self.ctx != "load":
raise Impossible()
try:
eval_ctx = get_eval_context(self, eval_ctx)
return self.environment.getattr(self.node.as_const(eval_ctx), self.attr)
except Exception:
raise Impossible()
def can_assign(self):
return False
class Slice(Expr):
"""Represents a slice object. This must only be used as argument for
:class:`Subscript`.
"""
fields = ("start", "stop", "step")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
def const(obj):
if obj is None:
return None
return obj.as_const(eval_ctx)
return slice(const(self.start), const(self.stop), const(self.step))
class Concat(Expr):
"""Concatenates the list of expressions provided after converting them to
unicode.
"""
fields = ("nodes",)
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return "".join(text_type(x.as_const(eval_ctx)) for x in self.nodes)
class Compare(Expr):
"""Compares an expression with some other expressions. `ops` must be a
list of :class:`Operand`\\s.
"""
fields = ("expr", "ops")
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
result = value = self.expr.as_const(eval_ctx)
try:
for op in self.ops:
new_value = op.expr.as_const(eval_ctx)
result = _cmpop_to_func[op.op](value, new_value)
if not result:
return False
value = new_value
except Exception:
raise Impossible()
return result
class Operand(Helper):
"""Holds an operator and an expression."""
fields = ("op", "expr")
if __debug__:
Operand.__doc__ += "\nThe following operators are available: " + ", ".join(
sorted(
"``%s``" % x
for x in set(_binop_to_func) | set(_uaop_to_func) | set(_cmpop_to_func)
)
)
class Mul(BinExpr):
"""Multiplies the left with the right node."""
operator = "*"
class Div(BinExpr):
"""Divides the left by the right node."""
operator = "/"
class FloorDiv(BinExpr):
"""Divides the left by the right node and truncates conver the
result into an integer by truncating.
"""
operator = "//"
class Add(BinExpr):
"""Add the left to the right node."""
operator = "+"
class Sub(BinExpr):
"""Subtract the right from the left node."""
operator = "-"
class Mod(BinExpr):
"""Left modulo right."""
operator = "%"
class Pow(BinExpr):
"""Left to the power of right."""
operator = "**"
class And(BinExpr):
"""Short circuited AND."""
operator = "and"
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return self.left.as_const(eval_ctx) and self.right.as_const(eval_ctx)
class Or(BinExpr):
"""Short circuited OR."""
operator = "or"
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return self.left.as_const(eval_ctx) or self.right.as_const(eval_ctx)
class Not(UnaryExpr):
"""Negate the expression."""
operator = "not"
class Neg(UnaryExpr):
"""Make the expression negative."""
operator = "-"
class Pos(UnaryExpr):
"""Make the expression positive (noop for most expressions)"""
operator = "+"
# Helpers for extensions
class EnvironmentAttribute(Expr):
"""Loads an attribute from the environment object. This is useful for
extensions that want to call a callback stored on the environment.
"""
fields = ("name",)
class ExtensionAttribute(Expr):
"""Returns the attribute of an extension bound to the environment.
The identifier is the identifier of the :class:`Extension`.
This node is usually constructed by calling the
:meth:`~jinja2.ext.Extension.attr` method on an extension.
"""
fields = ("identifier", "name")
class ImportedName(Expr):
"""If created with an import name the import name is returned on node
access. For example ``ImportedName('cgi.escape')`` returns the `escape`
function from the cgi module on evaluation. Imports are optimized by the
compiler so there is no need to assign them to local variables.
"""
fields = ("importname",)
class InternalName(Expr):
"""An internal name in the compiler. You cannot create these nodes
yourself but the parser provides a
:meth:`~jinja2.parser.Parser.free_identifier` method that creates
a new identifier for you. This identifier is not available from the
template and is not threated specially by the compiler.
"""
fields = ("name",)
def __init__(self):
raise TypeError(
"Can't create internal names. Use the "
"`free_identifier` method on a parser."
)
class MarkSafe(Expr):
"""Mark the wrapped expression as safe (wrap it as `Markup`)."""
fields = ("expr",)
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
return Markup(self.expr.as_const(eval_ctx))
class MarkSafeIfAutoescape(Expr):
"""Mark the wrapped expression as safe (wrap it as `Markup`) but
only if autoescaping is active.
.. versionadded:: 2.5
"""
fields = ("expr",)
def as_const(self, eval_ctx=None):
eval_ctx = get_eval_context(self, eval_ctx)
if eval_ctx.volatile:
raise Impossible()
expr = self.expr.as_const(eval_ctx)
if eval_ctx.autoescape:
return Markup(expr)
return expr
class ContextReference(Expr):
"""Returns the current template context. It can be used like a
:class:`Name` node, with a ``'load'`` ctx and will return the
current :class:`~jinja2.runtime.Context` object.
Here an example that assigns the current template name to a
variable named `foo`::
Assign(Name('foo', ctx='store'),
Getattr(ContextReference(), 'name'))
This is basically equivalent to using the
:func:`~jinja2.contextfunction` decorator when using the
high-level API, which causes a reference to the context to be passed
as the first argument to a function.
"""
class DerivedContextReference(Expr):
"""Return the current template context including locals. Behaves
exactly like :class:`ContextReference`, but includes local
variables, such as from a ``for`` loop.
.. versionadded:: 2.11
"""
class Continue(Stmt):
"""Continue a loop."""
class Break(Stmt):
"""Break a loop."""
class Scope(Stmt):
"""An artificial scope."""
fields = ("body",)
class OverlayScope(Stmt):
"""An overlay scope for extensions. This is a largely unoptimized scope
that however can be used to introduce completely arbitrary variables into
a sub scope from a dictionary or dictionary like object. The `context`
field has to evaluate to a dictionary object.
Example usage::
OverlayScope(context=self.call_method('get_context'),
body=[...])
.. versionadded:: 2.10
"""
fields = ("context", "body")
class EvalContextModifier(Stmt):
"""Modifies the eval context. For each option that should be modified,
a :class:`Keyword` has to be added to the :attr:`options` list.
Example to change the `autoescape` setting::
EvalContextModifier(options=[Keyword('autoescape', Const(True))])
"""
fields = ("options",)
class ScopedEvalContextModifier(EvalContextModifier):
"""Modifies the eval context and reverts it later. Works exactly like
:class:`EvalContextModifier` but will only modify the
:class:`~jinja2.nodes.EvalContext` for nodes in the :attr:`body`.
"""
fields = ("body",)
# make sure nobody creates custom nodes
def _failing_new(*args, **kwargs):
raise TypeError("can't create custom node types")
NodeType.__new__ = staticmethod(_failing_new)
del _failing_new
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/tests.py
|
# -*- coding: utf-8 -*-
"""Built-in template tests used with the ``is`` operator."""
import decimal
import operator
import re
from ._compat import abc
from ._compat import integer_types
from ._compat import string_types
from ._compat import text_type
from .runtime import Undefined
number_re = re.compile(r"^-?\d+(\.\d+)?$")
regex_type = type(number_re)
test_callable = callable
def test_odd(value):
"""Return true if the variable is odd."""
return value % 2 == 1
def test_even(value):
"""Return true if the variable is even."""
return value % 2 == 0
def test_divisibleby(value, num):
"""Check if a variable is divisible by a number."""
return value % num == 0
def test_defined(value):
"""Return true if the variable is defined:
.. sourcecode:: jinja
{% if variable is defined %}
value of variable: {{ variable }}
{% else %}
variable is not defined
{% endif %}
See the :func:`default` filter for a simple way to set undefined
variables.
"""
return not isinstance(value, Undefined)
def test_undefined(value):
"""Like :func:`defined` but the other way round."""
return isinstance(value, Undefined)
def test_none(value):
"""Return true if the variable is none."""
return value is None
def test_boolean(value):
"""Return true if the object is a boolean value.
.. versionadded:: 2.11
"""
return value is True or value is False
def test_false(value):
"""Return true if the object is False.
.. versionadded:: 2.11
"""
return value is False
def test_true(value):
"""Return true if the object is True.
.. versionadded:: 2.11
"""
return value is True
# NOTE: The existing 'number' test matches booleans and floats
def test_integer(value):
"""Return true if the object is an integer.
.. versionadded:: 2.11
"""
return isinstance(value, integer_types) and value is not True and value is not False
# NOTE: The existing 'number' test matches booleans and integers
def test_float(value):
"""Return true if the object is a float.
.. versionadded:: 2.11
"""
return isinstance(value, float)
def test_lower(value):
"""Return true if the variable is lowercased."""
return text_type(value).islower()
def test_upper(value):
"""Return true if the variable is uppercased."""
return text_type(value).isupper()
def test_string(value):
"""Return true if the object is a string."""
return isinstance(value, string_types)
def test_mapping(value):
"""Return true if the object is a mapping (dict etc.).
.. versionadded:: 2.6
"""
return isinstance(value, abc.Mapping)
def test_number(value):
"""Return true if the variable is a number."""
return isinstance(value, integer_types + (float, complex, decimal.Decimal))
def test_sequence(value):
"""Return true if the variable is a sequence. Sequences are variables
that are iterable.
"""
try:
len(value)
value.__getitem__
except Exception:
return False
return True
def test_sameas(value, other):
"""Check if an object points to the same memory address than another
object:
.. sourcecode:: jinja
{% if foo.attribute is sameas false %}
the foo attribute really is the `False` singleton
{% endif %}
"""
return value is other
def test_iterable(value):
"""Check if it's possible to iterate over an object."""
try:
iter(value)
except TypeError:
return False
return True
def test_escaped(value):
"""Check if the value is escaped."""
return hasattr(value, "__html__")
def test_in(value, seq):
"""Check if value is in seq.
.. versionadded:: 2.10
"""
return value in seq
TESTS = {
"odd": test_odd,
"even": test_even,
"divisibleby": test_divisibleby,
"defined": test_defined,
"undefined": test_undefined,
"none": test_none,
"boolean": test_boolean,
"false": test_false,
"true": test_true,
"integer": test_integer,
"float": test_float,
"lower": test_lower,
"upper": test_upper,
"string": test_string,
"mapping": test_mapping,
"number": test_number,
"sequence": test_sequence,
"iterable": test_iterable,
"callable": test_callable,
"sameas": test_sameas,
"escaped": test_escaped,
"in": test_in,
"==": operator.eq,
"eq": operator.eq,
"equalto": operator.eq,
"!=": operator.ne,
"ne": operator.ne,
">": operator.gt,
"gt": operator.gt,
"greaterthan": operator.gt,
"ge": operator.ge,
">=": operator.ge,
"<": operator.lt,
"lt": operator.lt,
"lessthan": operator.lt,
"<=": operator.le,
"le": operator.le,
}
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/bccache.py
|
# -*- coding: utf-8 -*-
"""The optional bytecode cache system. This is useful if you have very
complex template situations and the compilation of all those templates
slows down your application too much.
Situations where this is useful are often forking web applications that
are initialized on the first request.
"""
import errno
import fnmatch
import os
import stat
import sys
import tempfile
from hashlib import sha1
from os import listdir
from os import path
from ._compat import BytesIO
from ._compat import marshal_dump
from ._compat import marshal_load
from ._compat import pickle
from ._compat import text_type
from .utils import open_if_exists
bc_version = 4
# Magic bytes to identify Jinja bytecode cache files. Contains the
# Python major and minor version to avoid loading incompatible bytecode
# if a project upgrades its Python version.
bc_magic = (
b"j2"
+ pickle.dumps(bc_version, 2)
+ pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1], 2)
)
class Bucket(object):
"""Buckets are used to store the bytecode for one template. It's created
and initialized by the bytecode cache and passed to the loading functions.
The buckets get an internal checksum from the cache assigned and use this
to automatically reject outdated cache material. Individual bytecode
cache subclasses don't have to care about cache invalidation.
"""
def __init__(self, environment, key, checksum):
self.environment = environment
self.key = key
self.checksum = checksum
self.reset()
def reset(self):
"""Resets the bucket (unloads the bytecode)."""
self.code = None
def load_bytecode(self, f):
"""Loads bytecode from a file or file like object."""
# make sure the magic header is correct
magic = f.read(len(bc_magic))
if magic != bc_magic:
self.reset()
return
# the source code of the file changed, we need to reload
checksum = pickle.load(f)
if self.checksum != checksum:
self.reset()
return
# if marshal_load fails then we need to reload
try:
self.code = marshal_load(f)
except (EOFError, ValueError, TypeError):
self.reset()
return
def write_bytecode(self, f):
"""Dump the bytecode into the file or file like object passed."""
if self.code is None:
raise TypeError("can't write empty bucket")
f.write(bc_magic)
pickle.dump(self.checksum, f, 2)
marshal_dump(self.code, f)
def bytecode_from_string(self, string):
"""Load bytecode from a string."""
self.load_bytecode(BytesIO(string))
def bytecode_to_string(self):
"""Return the bytecode as string."""
out = BytesIO()
self.write_bytecode(out)
return out.getvalue()
class BytecodeCache(object):
"""To implement your own bytecode cache you have to subclass this class
and override :meth:`load_bytecode` and :meth:`dump_bytecode`. Both of
these methods are passed a :class:`~jinja2.bccache.Bucket`.
A very basic bytecode cache that saves the bytecode on the file system::
from os import path
class MyCache(BytecodeCache):
def __init__(self, directory):
self.directory = directory
def load_bytecode(self, bucket):
filename = path.join(self.directory, bucket.key)
if path.exists(filename):
with open(filename, 'rb') as f:
bucket.load_bytecode(f)
def dump_bytecode(self, bucket):
filename = path.join(self.directory, bucket.key)
with open(filename, 'wb') as f:
bucket.write_bytecode(f)
A more advanced version of a filesystem based bytecode cache is part of
Jinja.
"""
def load_bytecode(self, bucket):
"""Subclasses have to override this method to load bytecode into a
bucket. If they are not able to find code in the cache for the
bucket, it must not do anything.
"""
raise NotImplementedError()
def dump_bytecode(self, bucket):
"""Subclasses have to override this method to write the bytecode
from a bucket back to the cache. If it unable to do so it must not
fail silently but raise an exception.
"""
raise NotImplementedError()
def clear(self):
"""Clears the cache. This method is not used by Jinja but should be
implemented to allow applications to clear the bytecode cache used
by a particular environment.
"""
def get_cache_key(self, name, filename=None):
"""Returns the unique hash key for this template name."""
hash = sha1(name.encode("utf-8"))
if filename is not None:
filename = "|" + filename
if isinstance(filename, text_type):
filename = filename.encode("utf-8")
hash.update(filename)
return hash.hexdigest()
def get_source_checksum(self, source):
"""Returns a checksum for the source."""
return sha1(source.encode("utf-8")).hexdigest()
def get_bucket(self, environment, name, filename, source):
"""Return a cache bucket for the given template. All arguments are
mandatory but filename may be `None`.
"""
key = self.get_cache_key(name, filename)
checksum = self.get_source_checksum(source)
bucket = Bucket(environment, key, checksum)
self.load_bytecode(bucket)
return bucket
def set_bucket(self, bucket):
"""Put the bucket into the cache."""
self.dump_bytecode(bucket)
class FileSystemBytecodeCache(BytecodeCache):
"""A bytecode cache that stores bytecode on the filesystem. It accepts
two arguments: The directory where the cache items are stored and a
pattern string that is used to build the filename.
If no directory is specified a default cache directory is selected. On
Windows the user's temp directory is used, on UNIX systems a directory
is created for the user in the system temp directory.
The pattern can be used to have multiple separate caches operate on the
same directory. The default pattern is ``'__jinja2_%s.cache'``. ``%s``
is replaced with the cache key.
>>> bcc = FileSystemBytecodeCache('/tmp/jinja_cache', '%s.cache')
This bytecode cache supports clearing of the cache using the clear method.
"""
def __init__(self, directory=None, pattern="__jinja2_%s.cache"):
if directory is None:
directory = self._get_default_cache_dir()
self.directory = directory
self.pattern = pattern
def _get_default_cache_dir(self):
def _unsafe_dir():
raise RuntimeError(
"Cannot determine safe temp directory. You "
"need to explicitly provide one."
)
tmpdir = tempfile.gettempdir()
# On windows the temporary directory is used specific unless
# explicitly forced otherwise. We can just use that.
if os.name == "nt":
return tmpdir
if not hasattr(os, "getuid"):
_unsafe_dir()
dirname = "_jinja2-cache-%d" % os.getuid()
actual_dir = os.path.join(tmpdir, dirname)
try:
os.mkdir(actual_dir, stat.S_IRWXU)
except OSError as e:
if e.errno != errno.EEXIST:
raise
try:
os.chmod(actual_dir, stat.S_IRWXU)
actual_dir_stat = os.lstat(actual_dir)
if (
actual_dir_stat.st_uid != os.getuid()
or not stat.S_ISDIR(actual_dir_stat.st_mode)
or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
):
_unsafe_dir()
except OSError as e:
if e.errno != errno.EEXIST:
raise
actual_dir_stat = os.lstat(actual_dir)
if (
actual_dir_stat.st_uid != os.getuid()
or not stat.S_ISDIR(actual_dir_stat.st_mode)
or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
):
_unsafe_dir()
return actual_dir
def _get_cache_filename(self, bucket):
return path.join(self.directory, self.pattern % bucket.key)
def load_bytecode(self, bucket):
f = open_if_exists(self._get_cache_filename(bucket), "rb")
if f is not None:
try:
bucket.load_bytecode(f)
finally:
f.close()
def dump_bytecode(self, bucket):
f = open(self._get_cache_filename(bucket), "wb")
try:
bucket.write_bytecode(f)
finally:
f.close()
def clear(self):
# imported lazily here because google app-engine doesn't support
# write access on the file system and the function does not exist
# normally.
from os import remove
files = fnmatch.filter(listdir(self.directory), self.pattern % "*")
for filename in files:
try:
remove(path.join(self.directory, filename))
except OSError:
pass
class MemcachedBytecodeCache(BytecodeCache):
"""This class implements a bytecode cache that uses a memcache cache for
storing the information. It does not enforce a specific memcache library
(tummy's memcache or cmemcache) but will accept any class that provides
the minimal interface required.
Libraries compatible with this class:
- `cachelib <https://github.com/pallets/cachelib>`_
- `python-memcached <https://pypi.org/project/python-memcached/>`_
(Unfortunately the django cache interface is not compatible because it
does not support storing binary data, only unicode. You can however pass
the underlying cache client to the bytecode cache which is available
as `django.core.cache.cache._client`.)
The minimal interface for the client passed to the constructor is this:
.. class:: MinimalClientInterface
.. method:: set(key, value[, timeout])
Stores the bytecode in the cache. `value` is a string and
`timeout` the timeout of the key. If timeout is not provided
a default timeout or no timeout should be assumed, if it's
provided it's an integer with the number of seconds the cache
item should exist.
.. method:: get(key)
Returns the value for the cache key. If the item does not
exist in the cache the return value must be `None`.
The other arguments to the constructor are the prefix for all keys that
is added before the actual cache key and the timeout for the bytecode in
the cache system. We recommend a high (or no) timeout.
This bytecode cache does not support clearing of used items in the cache.
The clear method is a no-operation function.
.. versionadded:: 2.7
Added support for ignoring memcache errors through the
`ignore_memcache_errors` parameter.
"""
def __init__(
self,
client,
prefix="jinja2/bytecode/",
timeout=None,
ignore_memcache_errors=True,
):
self.client = client
self.prefix = prefix
self.timeout = timeout
self.ignore_memcache_errors = ignore_memcache_errors
def load_bytecode(self, bucket):
try:
code = self.client.get(self.prefix + bucket.key)
except Exception:
if not self.ignore_memcache_errors:
raise
code = None
if code is not None:
bucket.bytecode_from_string(code)
def dump_bytecode(self, bucket):
args = (self.prefix + bucket.key, bucket.bytecode_to_string())
if self.timeout is not None:
args += (self.timeout,)
try:
self.client.set(*args)
except Exception:
if not self.ignore_memcache_errors:
raise
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/filters.py
|
# -*- coding: utf-8 -*-
"""Built-in template filters used with the ``|`` operator."""
import math
import random
import re
import warnings
from collections import namedtuple
from itertools import chain
from itertools import groupby
from markupsafe import escape
from markupsafe import Markup
from markupsafe import soft_unicode
from ._compat import abc
from ._compat import imap
from ._compat import iteritems
from ._compat import string_types
from ._compat import text_type
from .exceptions import FilterArgumentError
from .runtime import Undefined
from .utils import htmlsafe_json_dumps
from .utils import pformat
from .utils import unicode_urlencode
from .utils import urlize
_word_re = re.compile(r"\w+", re.UNICODE)
_word_beginning_split_re = re.compile(r"([-\s\(\{\[\<]+)", re.UNICODE)
def contextfilter(f):
"""Decorator for marking context dependent filters. The current
:class:`Context` will be passed as first argument.
"""
f.contextfilter = True
return f
def evalcontextfilter(f):
"""Decorator for marking eval-context dependent filters. An eval
context object is passed as first argument. For more information
about the eval context, see :ref:`eval-context`.
.. versionadded:: 2.4
"""
f.evalcontextfilter = True
return f
def environmentfilter(f):
"""Decorator for marking environment dependent filters. The current
:class:`Environment` is passed to the filter as first argument.
"""
f.environmentfilter = True
return f
def ignore_case(value):
"""For use as a postprocessor for :func:`make_attrgetter`. Converts strings
to lowercase and returns other types as-is."""
return value.lower() if isinstance(value, string_types) else value
def make_attrgetter(environment, attribute, postprocess=None, default=None):
"""Returns a callable that looks up the given attribute from a
passed object with the rules of the environment. Dots are allowed
to access attributes of attributes. Integer parts in paths are
looked up as integers.
"""
attribute = _prepare_attribute_parts(attribute)
def attrgetter(item):
for part in attribute:
item = environment.getitem(item, part)
if default and isinstance(item, Undefined):
item = default
if postprocess is not None:
item = postprocess(item)
return item
return attrgetter
def make_multi_attrgetter(environment, attribute, postprocess=None):
"""Returns a callable that looks up the given comma separated
attributes from a passed object with the rules of the environment.
Dots are allowed to access attributes of each attribute. Integer
parts in paths are looked up as integers.
The value returned by the returned callable is a list of extracted
attribute values.
Examples of attribute: "attr1,attr2", "attr1.inner1.0,attr2.inner2.0", etc.
"""
attribute_parts = (
attribute.split(",") if isinstance(attribute, string_types) else [attribute]
)
attribute = [
_prepare_attribute_parts(attribute_part) for attribute_part in attribute_parts
]
def attrgetter(item):
items = [None] * len(attribute)
for i, attribute_part in enumerate(attribute):
item_i = item
for part in attribute_part:
item_i = environment.getitem(item_i, part)
if postprocess is not None:
item_i = postprocess(item_i)
items[i] = item_i
return items
return attrgetter
def _prepare_attribute_parts(attr):
if attr is None:
return []
elif isinstance(attr, string_types):
return [int(x) if x.isdigit() else x for x in attr.split(".")]
else:
return [attr]
def do_forceescape(value):
"""Enforce HTML escaping. This will probably double escape variables."""
if hasattr(value, "__html__"):
value = value.__html__()
return escape(text_type(value))
def do_urlencode(value):
"""Quote data for use in a URL path or query using UTF-8.
Basic wrapper around :func:`urllib.parse.quote` when given a
string, or :func:`urllib.parse.urlencode` for a dict or iterable.
:param value: Data to quote. A string will be quoted directly. A
dict or iterable of ``(key, value)`` pairs will be joined as a
query string.
When given a string, "/" is not quoted. HTTP servers treat "/" and
"%2F" equivalently in paths. If you need quoted slashes, use the
``|replace("/", "%2F")`` filter.
.. versionadded:: 2.7
"""
if isinstance(value, string_types) or not isinstance(value, abc.Iterable):
return unicode_urlencode(value)
if isinstance(value, dict):
items = iteritems(value)
else:
items = iter(value)
return u"&".join(
"%s=%s" % (unicode_urlencode(k, for_qs=True), unicode_urlencode(v, for_qs=True))
for k, v in items
)
@evalcontextfilter
def do_replace(eval_ctx, s, old, new, count=None):
"""Return a copy of the value with all occurrences of a substring
replaced with a new one. The first argument is the substring
that should be replaced, the second is the replacement string.
If the optional third argument ``count`` is given, only the first
``count`` occurrences are replaced:
.. sourcecode:: jinja
{{ "Hello World"|replace("Hello", "Goodbye") }}
-> Goodbye World
{{ "aaaaargh"|replace("a", "d'oh, ", 2) }}
-> d'oh, d'oh, aaargh
"""
if count is None:
count = -1
if not eval_ctx.autoescape:
return text_type(s).replace(text_type(old), text_type(new), count)
if (
hasattr(old, "__html__")
or hasattr(new, "__html__")
and not hasattr(s, "__html__")
):
s = escape(s)
else:
s = soft_unicode(s)
return s.replace(soft_unicode(old), soft_unicode(new), count)
def do_upper(s):
"""Convert a value to uppercase."""
return soft_unicode(s).upper()
def do_lower(s):
"""Convert a value to lowercase."""
return soft_unicode(s).lower()
@evalcontextfilter
def do_xmlattr(_eval_ctx, d, autospace=True):
"""Create an SGML/XML attribute string based on the items in a dict.
All values that are neither `none` nor `undefined` are automatically
escaped:
.. sourcecode:: html+jinja
<ul{{ {'class': 'my_list', 'missing': none,
'id': 'list-%d'|format(variable)}|xmlattr }}>
...
</ul>
Results in something like this:
.. sourcecode:: html
<ul class="my_list" id="list-42">
...
</ul>
As you can see it automatically prepends a space in front of the item
if the filter returned something unless the second parameter is false.
"""
rv = u" ".join(
u'%s="%s"' % (escape(key), escape(value))
for key, value in iteritems(d)
if value is not None and not isinstance(value, Undefined)
)
if autospace and rv:
rv = u" " + rv
if _eval_ctx.autoescape:
rv = Markup(rv)
return rv
def do_capitalize(s):
"""Capitalize a value. The first character will be uppercase, all others
lowercase.
"""
return soft_unicode(s).capitalize()
def do_title(s):
"""Return a titlecased version of the value. I.e. words will start with
uppercase letters, all remaining characters are lowercase.
"""
return "".join(
[
item[0].upper() + item[1:].lower()
for item in _word_beginning_split_re.split(soft_unicode(s))
if item
]
)
def do_dictsort(value, case_sensitive=False, by="key", reverse=False):
"""Sort a dict and yield (key, value) pairs. Because python dicts are
unsorted you may want to use this function to order them by either
key or value:
.. sourcecode:: jinja
{% for item in mydict|dictsort %}
sort the dict by key, case insensitive
{% for item in mydict|dictsort(reverse=true) %}
sort the dict by key, case insensitive, reverse order
{% for item in mydict|dictsort(true) %}
sort the dict by key, case sensitive
{% for item in mydict|dictsort(false, 'value') %}
sort the dict by value, case insensitive
"""
if by == "key":
pos = 0
elif by == "value":
pos = 1
else:
raise FilterArgumentError('You can only sort by either "key" or "value"')
def sort_func(item):
value = item[pos]
if not case_sensitive:
value = ignore_case(value)
return value
return sorted(value.items(), key=sort_func, reverse=reverse)
@environmentfilter
def do_sort(environment, value, reverse=False, case_sensitive=False, attribute=None):
"""Sort an iterable using Python's :func:`sorted`.
.. sourcecode:: jinja
{% for city in cities|sort %}
...
{% endfor %}
:param reverse: Sort descending instead of ascending.
:param case_sensitive: When sorting strings, sort upper and lower
case separately.
:param attribute: When sorting objects or dicts, an attribute or
key to sort by. Can use dot notation like ``"address.city"``.
Can be a list of attributes like ``"age,name"``.
The sort is stable, it does not change the relative order of
elements that compare equal. This makes it is possible to chain
sorts on different attributes and ordering.
.. sourcecode:: jinja
{% for user in users|sort(attribute="name")
|sort(reverse=true, attribute="age") %}
...
{% endfor %}
As a shortcut to chaining when the direction is the same for all
attributes, pass a comma separate list of attributes.
.. sourcecode:: jinja
{% for user users|sort(attribute="age,name") %}
...
{% endfor %}
.. versionchanged:: 2.11.0
The ``attribute`` parameter can be a comma separated list of
attributes, e.g. ``"age,name"``.
.. versionchanged:: 2.6
The ``attribute`` parameter was added.
"""
key_func = make_multi_attrgetter(
environment, attribute, postprocess=ignore_case if not case_sensitive else None
)
return sorted(value, key=key_func, reverse=reverse)
@environmentfilter
def do_unique(environment, value, case_sensitive=False, attribute=None):
"""Returns a list of unique items from the given iterable.
.. sourcecode:: jinja
{{ ['foo', 'bar', 'foobar', 'FooBar']|unique|list }}
-> ['foo', 'bar', 'foobar']
The unique items are yielded in the same order as their first occurrence in
the iterable passed to the filter.
:param case_sensitive: Treat upper and lower case strings as distinct.
:param attribute: Filter objects with unique values for this attribute.
"""
getter = make_attrgetter(
environment, attribute, postprocess=ignore_case if not case_sensitive else None
)
seen = set()
for item in value:
key = getter(item)
if key not in seen:
seen.add(key)
yield item
def _min_or_max(environment, value, func, case_sensitive, attribute):
it = iter(value)
try:
first = next(it)
except StopIteration:
return environment.undefined("No aggregated item, sequence was empty.")
key_func = make_attrgetter(
environment, attribute, postprocess=ignore_case if not case_sensitive else None
)
return func(chain([first], it), key=key_func)
@environmentfilter
def do_min(environment, value, case_sensitive=False, attribute=None):
"""Return the smallest item from the sequence.
.. sourcecode:: jinja
{{ [1, 2, 3]|min }}
-> 1
:param case_sensitive: Treat upper and lower case strings as distinct.
:param attribute: Get the object with the min value of this attribute.
"""
return _min_or_max(environment, value, min, case_sensitive, attribute)
@environmentfilter
def do_max(environment, value, case_sensitive=False, attribute=None):
"""Return the largest item from the sequence.
.. sourcecode:: jinja
{{ [1, 2, 3]|max }}
-> 3
:param case_sensitive: Treat upper and lower case strings as distinct.
:param attribute: Get the object with the max value of this attribute.
"""
return _min_or_max(environment, value, max, case_sensitive, attribute)
def do_default(value, default_value=u"", boolean=False):
"""If the value is undefined it will return the passed default value,
otherwise the value of the variable:
.. sourcecode:: jinja
{{ my_variable|default('my_variable is not defined') }}
This will output the value of ``my_variable`` if the variable was
defined, otherwise ``'my_variable is not defined'``. If you want
to use default with variables that evaluate to false you have to
set the second parameter to `true`:
.. sourcecode:: jinja
{{ ''|default('the string was empty', true) }}
.. versionchanged:: 2.11
It's now possible to configure the :class:`~jinja2.Environment` with
:class:`~jinja2.ChainableUndefined` to make the `default` filter work
on nested elements and attributes that may contain undefined values
in the chain without getting an :exc:`~jinja2.UndefinedError`.
"""
if isinstance(value, Undefined) or (boolean and not value):
return default_value
return value
@evalcontextfilter
def do_join(eval_ctx, value, d=u"", attribute=None):
"""Return a string which is the concatenation of the strings in the
sequence. The separator between elements is an empty string per
default, you can define it with the optional parameter:
.. sourcecode:: jinja
{{ [1, 2, 3]|join('|') }}
-> 1|2|3
{{ [1, 2, 3]|join }}
-> 123
It is also possible to join certain attributes of an object:
.. sourcecode:: jinja
{{ users|join(', ', attribute='username') }}
.. versionadded:: 2.6
The `attribute` parameter was added.
"""
if attribute is not None:
value = imap(make_attrgetter(eval_ctx.environment, attribute), value)
# no automatic escaping? joining is a lot easier then
if not eval_ctx.autoescape:
return text_type(d).join(imap(text_type, value))
# if the delimiter doesn't have an html representation we check
# if any of the items has. If yes we do a coercion to Markup
if not hasattr(d, "__html__"):
value = list(value)
do_escape = False
for idx, item in enumerate(value):
if hasattr(item, "__html__"):
do_escape = True
else:
value[idx] = text_type(item)
if do_escape:
d = escape(d)
else:
d = text_type(d)
return d.join(value)
# no html involved, to normal joining
return soft_unicode(d).join(imap(soft_unicode, value))
def do_center(value, width=80):
"""Centers the value in a field of a given width."""
return text_type(value).center(width)
@environmentfilter
def do_first(environment, seq):
"""Return the first item of a sequence."""
try:
return next(iter(seq))
except StopIteration:
return environment.undefined("No first item, sequence was empty.")
@environmentfilter
def do_last(environment, seq):
"""
Return the last item of a sequence.
Note: Does not work with generators. You may want to explicitly
convert it to a list:
.. sourcecode:: jinja
{{ data | selectattr('name', '==', 'Jinja') | list | last }}
"""
try:
return next(iter(reversed(seq)))
except StopIteration:
return environment.undefined("No last item, sequence was empty.")
@contextfilter
def do_random(context, seq):
"""Return a random item from the sequence."""
try:
return random.choice(seq)
except IndexError:
return context.environment.undefined("No random item, sequence was empty.")
def do_filesizeformat(value, binary=False):
"""Format the value like a 'human-readable' file size (i.e. 13 kB,
4.1 MB, 102 Bytes, etc). Per default decimal prefixes are used (Mega,
Giga, etc.), if the second parameter is set to `True` the binary
prefixes are used (Mebi, Gibi).
"""
bytes = float(value)
base = binary and 1024 or 1000
prefixes = [
(binary and "KiB" or "kB"),
(binary and "MiB" or "MB"),
(binary and "GiB" or "GB"),
(binary and "TiB" or "TB"),
(binary and "PiB" or "PB"),
(binary and "EiB" or "EB"),
(binary and "ZiB" or "ZB"),
(binary and "YiB" or "YB"),
]
if bytes == 1:
return "1 Byte"
elif bytes < base:
return "%d Bytes" % bytes
else:
for i, prefix in enumerate(prefixes):
unit = base ** (i + 2)
if bytes < unit:
return "%.1f %s" % ((base * bytes / unit), prefix)
return "%.1f %s" % ((base * bytes / unit), prefix)
def do_pprint(value, verbose=False):
"""Pretty print a variable. Useful for debugging.
With Jinja 1.2 onwards you can pass it a parameter. If this parameter
is truthy the output will be more verbose (this requires `pretty`)
"""
return pformat(value, verbose=verbose)
@evalcontextfilter
def do_urlize(
eval_ctx, value, trim_url_limit=None, nofollow=False, target=None, rel=None
):
"""Converts URLs in plain text into clickable links.
If you pass the filter an additional integer it will shorten the urls
to that number. Also a third argument exists that makes the urls
"nofollow":
.. sourcecode:: jinja
{{ mytext|urlize(40, true) }}
links are shortened to 40 chars and defined with rel="nofollow"
If *target* is specified, the ``target`` attribute will be added to the
``<a>`` tag:
.. sourcecode:: jinja
{{ mytext|urlize(40, target='_blank') }}
.. versionchanged:: 2.8+
The *target* parameter was added.
"""
policies = eval_ctx.environment.policies
rel = set((rel or "").split() or [])
if nofollow:
rel.add("nofollow")
rel.update((policies["urlize.rel"] or "").split())
if target is None:
target = policies["urlize.target"]
rel = " ".join(sorted(rel)) or None
rv = urlize(value, trim_url_limit, rel=rel, target=target)
if eval_ctx.autoescape:
rv = Markup(rv)
return rv
def do_indent(s, width=4, first=False, blank=False, indentfirst=None):
"""Return a copy of the string with each line indented by 4 spaces. The
first line and blank lines are not indented by default.
:param width: Number of spaces to indent by.
:param first: Don't skip indenting the first line.
:param blank: Don't skip indenting empty lines.
.. versionchanged:: 2.10
Blank lines are not indented by default.
Rename the ``indentfirst`` argument to ``first``.
"""
if indentfirst is not None:
warnings.warn(
"The 'indentfirst' argument is renamed to 'first' and will"
" be removed in version 3.0.",
DeprecationWarning,
stacklevel=2,
)
first = indentfirst
indention = u" " * width
newline = u"\n"
if isinstance(s, Markup):
indention = Markup(indention)
newline = Markup(newline)
s += newline # this quirk is necessary for splitlines method
if blank:
rv = (newline + indention).join(s.splitlines())
else:
lines = s.splitlines()
rv = lines.pop(0)
if lines:
rv += newline + newline.join(
indention + line if line else line for line in lines
)
if first:
rv = indention + rv
return rv
@environmentfilter
def do_truncate(env, s, length=255, killwords=False, end="...", leeway=None):
"""Return a truncated copy of the string. The length is specified
with the first parameter which defaults to ``255``. If the second
parameter is ``true`` the filter will cut the text at length. Otherwise
it will discard the last word. If the text was in fact
truncated it will append an ellipsis sign (``"..."``). If you want a
different ellipsis sign than ``"..."`` you can specify it using the
third parameter. Strings that only exceed the length by the tolerance
margin given in the fourth parameter will not be truncated.
.. sourcecode:: jinja
{{ "foo bar baz qux"|truncate(9) }}
-> "foo..."
{{ "foo bar baz qux"|truncate(9, True) }}
-> "foo ba..."
{{ "foo bar baz qux"|truncate(11) }}
-> "foo bar baz qux"
{{ "foo bar baz qux"|truncate(11, False, '...', 0) }}
-> "foo bar..."
The default leeway on newer Jinja versions is 5 and was 0 before but
can be reconfigured globally.
"""
if leeway is None:
leeway = env.policies["truncate.leeway"]
assert length >= len(end), "expected length >= %s, got %s" % (len(end), length)
assert leeway >= 0, "expected leeway >= 0, got %s" % leeway
if len(s) <= length + leeway:
return s
if killwords:
return s[: length - len(end)] + end
result = s[: length - len(end)].rsplit(" ", 1)[0]
return result + end
@environmentfilter
def do_wordwrap(
environment,
s,
width=79,
break_long_words=True,
wrapstring=None,
break_on_hyphens=True,
):
"""Wrap a string to the given width. Existing newlines are treated
as paragraphs to be wrapped separately.
:param s: Original text to wrap.
:param width: Maximum length of wrapped lines.
:param break_long_words: If a word is longer than ``width``, break
it across lines.
:param break_on_hyphens: If a word contains hyphens, it may be split
across lines.
:param wrapstring: String to join each wrapped line. Defaults to
:attr:`Environment.newline_sequence`.
.. versionchanged:: 2.11
Existing newlines are treated as paragraphs wrapped separately.
.. versionchanged:: 2.11
Added the ``break_on_hyphens`` parameter.
.. versionchanged:: 2.7
Added the ``wrapstring`` parameter.
"""
import textwrap
if not wrapstring:
wrapstring = environment.newline_sequence
# textwrap.wrap doesn't consider existing newlines when wrapping.
# If the string has a newline before width, wrap will still insert
# a newline at width, resulting in a short line. Instead, split and
# wrap each paragraph individually.
return wrapstring.join(
[
wrapstring.join(
textwrap.wrap(
line,
width=width,
expand_tabs=False,
replace_whitespace=False,
break_long_words=break_long_words,
break_on_hyphens=break_on_hyphens,
)
)
for line in s.splitlines()
]
)
def do_wordcount(s):
"""Count the words in that string."""
return len(_word_re.findall(soft_unicode(s)))
def do_int(value, default=0, base=10):
"""Convert the value into an integer. If the
conversion doesn't work it will return ``0``. You can
override this default using the first parameter. You
can also override the default base (10) in the second
parameter, which handles input with prefixes such as
0b, 0o and 0x for bases 2, 8 and 16 respectively.
The base is ignored for decimal numbers and non-string values.
"""
try:
if isinstance(value, string_types):
return int(value, base)
return int(value)
except (TypeError, ValueError):
# this quirk is necessary so that "42.23"|int gives 42.
try:
return int(float(value))
except (TypeError, ValueError):
return default
def do_float(value, default=0.0):
"""Convert the value into a floating point number. If the
conversion doesn't work it will return ``0.0``. You can
override this default using the first parameter.
"""
try:
return float(value)
except (TypeError, ValueError):
return default
def do_format(value, *args, **kwargs):
"""Apply the given values to a `printf-style`_ format string, like
``string % values``.
.. sourcecode:: jinja
{{ "%s, %s!"|format(greeting, name) }}
Hello, World!
In most cases it should be more convenient and efficient to use the
``%`` operator or :meth:`str.format`.
.. code-block:: text
{{ "%s, %s!" % (greeting, name) }}
{{ "{}, {}!".format(greeting, name) }}
.. _printf-style: https://docs.python.org/library/stdtypes.html
#printf-style-string-formatting
"""
if args and kwargs:
raise FilterArgumentError(
"can't handle positional and keyword arguments at the same time"
)
return soft_unicode(value) % (kwargs or args)
def do_trim(value, chars=None):
"""Strip leading and trailing characters, by default whitespace."""
return soft_unicode(value).strip(chars)
def do_striptags(value):
"""Strip SGML/XML tags and replace adjacent whitespace by one space."""
if hasattr(value, "__html__"):
value = value.__html__()
return Markup(text_type(value)).striptags()
def do_slice(value, slices, fill_with=None):
"""Slice an iterator and return a list of lists containing
those items. Useful if you want to create a div containing
three ul tags that represent columns:
.. sourcecode:: html+jinja
<div class="columnwrapper">
{%- for column in items|slice(3) %}
<ul class="column-{{ loop.index }}">
{%- for item in column %}
<li>{{ item }}</li>
{%- endfor %}
</ul>
{%- endfor %}
</div>
If you pass it a second argument it's used to fill missing
values on the last iteration.
"""
seq = list(value)
length = len(seq)
items_per_slice = length // slices
slices_with_extra = length % slices
offset = 0
for slice_number in range(slices):
start = offset + slice_number * items_per_slice
if slice_number < slices_with_extra:
offset += 1
end = offset + (slice_number + 1) * items_per_slice
tmp = seq[start:end]
if fill_with is not None and slice_number >= slices_with_extra:
tmp.append(fill_with)
yield tmp
def do_batch(value, linecount, fill_with=None):
"""
A filter that batches items. It works pretty much like `slice`
just the other way round. It returns a list of lists with the
given number of items. If you provide a second parameter this
is used to fill up missing items. See this example:
.. sourcecode:: html+jinja
<table>
{%- for row in items|batch(3, ' ') %}
<tr>
{%- for column in row %}
<td>{{ column }}</td>
{%- endfor %}
</tr>
{%- endfor %}
</table>
"""
tmp = []
for item in value:
if len(tmp) == linecount:
yield tmp
tmp = []
tmp.append(item)
if tmp:
if fill_with is not None and len(tmp) < linecount:
tmp += [fill_with] * (linecount - len(tmp))
yield tmp
def do_round(value, precision=0, method="common"):
"""Round the number to a given precision. The first
parameter specifies the precision (default is ``0``), the
second the rounding method:
- ``'common'`` rounds either up or down
- ``'ceil'`` always rounds up
- ``'floor'`` always rounds down
If you don't specify a method ``'common'`` is used.
.. sourcecode:: jinja
{{ 42.55|round }}
-> 43.0
{{ 42.55|round(1, 'floor') }}
-> 42.5
Note that even if rounded to 0 precision, a float is returned. If
you need a real integer, pipe it through `int`:
.. sourcecode:: jinja
{{ 42.55|round|int }}
-> 43
"""
if method not in {"common", "ceil", "floor"}:
raise FilterArgumentError("method must be common, ceil or floor")
if method == "common":
return round(value, precision)
func = getattr(math, method)
return func(value * (10 ** precision)) / (10 ** precision)
# Use a regular tuple repr here. This is what we did in the past and we
# really want to hide this custom type as much as possible. In particular
# we do not want to accidentally expose an auto generated repr in case
# people start to print this out in comments or something similar for
# debugging.
_GroupTuple = namedtuple("_GroupTuple", ["grouper", "list"])
_GroupTuple.__repr__ = tuple.__repr__
_GroupTuple.__str__ = tuple.__str__
@environmentfilter
def do_groupby(environment, value, attribute):
"""Group a sequence of objects by an attribute using Python's
:func:`itertools.groupby`. The attribute can use dot notation for
nested access, like ``"address.city"``. Unlike Python's ``groupby``,
the values are sorted first so only one group is returned for each
unique value.
For example, a list of ``User`` objects with a ``city`` attribute
can be rendered in groups. In this example, ``grouper`` refers to
the ``city`` value of the group.
.. sourcecode:: html+jinja
<ul>{% for city, items in users|groupby("city") %}
<li>{{ city }}
<ul>{% for user in items %}
<li>{{ user.name }}
{% endfor %}</ul>
</li>
{% endfor %}</ul>
``groupby`` yields namedtuples of ``(grouper, list)``, which
can be used instead of the tuple unpacking above. ``grouper`` is the
value of the attribute, and ``list`` is the items with that value.
.. sourcecode:: html+jinja
<ul>{% for group in users|groupby("city") %}
<li>{{ group.grouper }}: {{ group.list|join(", ") }}
{% endfor %}</ul>
.. versionchanged:: 2.6
The attribute supports dot notation for nested access.
"""
expr = make_attrgetter(environment, attribute)
return [
_GroupTuple(key, list(values))
for key, values in groupby(sorted(value, key=expr), expr)
]
@environmentfilter
def do_sum(environment, iterable, attribute=None, start=0):
"""Returns the sum of a sequence of numbers plus the value of parameter
'start' (which defaults to 0). When the sequence is empty it returns
start.
It is also possible to sum up only certain attributes:
.. sourcecode:: jinja
Total: {{ items|sum(attribute='price') }}
.. versionchanged:: 2.6
The `attribute` parameter was added to allow suming up over
attributes. Also the `start` parameter was moved on to the right.
"""
if attribute is not None:
iterable = imap(make_attrgetter(environment, attribute), iterable)
return sum(iterable, start)
def do_list(value):
"""Convert the value into a list. If it was a string the returned list
will be a list of characters.
"""
return list(value)
def do_mark_safe(value):
"""Mark the value as safe which means that in an environment with automatic
escaping enabled this variable will not be escaped.
"""
return Markup(value)
def do_mark_unsafe(value):
"""Mark a value as unsafe. This is the reverse operation for :func:`safe`."""
return text_type(value)
def do_reverse(value):
"""Reverse the object or return an iterator that iterates over it the other
way round.
"""
if isinstance(value, string_types):
return value[::-1]
try:
return reversed(value)
except TypeError:
try:
rv = list(value)
rv.reverse()
return rv
except TypeError:
raise FilterArgumentError("argument must be iterable")
@environmentfilter
def do_attr(environment, obj, name):
"""Get an attribute of an object. ``foo|attr("bar")`` works like
``foo.bar`` just that always an attribute is returned and items are not
looked up.
See :ref:`Notes on subscriptions <notes-on-subscriptions>` for more details.
"""
try:
name = str(name)
except UnicodeError:
pass
else:
try:
value = getattr(obj, name)
except AttributeError:
pass
else:
if environment.sandboxed and not environment.is_safe_attribute(
obj, name, value
):
return environment.unsafe_undefined(obj, name)
return value
return environment.undefined(obj=obj, name=name)
@contextfilter
def do_map(*args, **kwargs):
"""Applies a filter on a sequence of objects or looks up an attribute.
This is useful when dealing with lists of objects but you are really
only interested in a certain value of it.
The basic usage is mapping on an attribute. Imagine you have a list
of users but you are only interested in a list of usernames:
.. sourcecode:: jinja
Users on this page: {{ users|map(attribute='username')|join(', ') }}
You can specify a ``default`` value to use if an object in the list
does not have the given attribute.
.. sourcecode:: jinja
{{ users|map(attribute="username", default="Anonymous")|join(", ") }}
Alternatively you can let it invoke a filter by passing the name of the
filter and the arguments afterwards. A good example would be applying a
text conversion filter on a sequence:
.. sourcecode:: jinja
Users on this page: {{ titles|map('lower')|join(', ') }}
Similar to a generator comprehension such as:
.. code-block:: python
(u.username for u in users)
(u.username or "Anonymous" for u in users)
(do_lower(x) for x in titles)
.. versionchanged:: 2.11.0
Added the ``default`` parameter.
.. versionadded:: 2.7
"""
seq, func = prepare_map(args, kwargs)
if seq:
for item in seq:
yield func(item)
@contextfilter
def do_select(*args, **kwargs):
"""Filters a sequence of objects by applying a test to each object,
and only selecting the objects with the test succeeding.
If no test is specified, each object will be evaluated as a boolean.
Example usage:
.. sourcecode:: jinja
{{ numbers|select("odd") }}
{{ numbers|select("odd") }}
{{ numbers|select("divisibleby", 3) }}
{{ numbers|select("lessthan", 42) }}
{{ strings|select("equalto", "mystring") }}
Similar to a generator comprehension such as:
.. code-block:: python
(n for n in numbers if test_odd(n))
(n for n in numbers if test_divisibleby(n, 3))
.. versionadded:: 2.7
"""
return select_or_reject(args, kwargs, lambda x: x, False)
@contextfilter
def do_reject(*args, **kwargs):
"""Filters a sequence of objects by applying a test to each object,
and rejecting the objects with the test succeeding.
If no test is specified, each object will be evaluated as a boolean.
Example usage:
.. sourcecode:: jinja
{{ numbers|reject("odd") }}
Similar to a generator comprehension such as:
.. code-block:: python
(n for n in numbers if not test_odd(n))
.. versionadded:: 2.7
"""
return select_or_reject(args, kwargs, lambda x: not x, False)
@contextfilter
def do_selectattr(*args, **kwargs):
"""Filters a sequence of objects by applying a test to the specified
attribute of each object, and only selecting the objects with the
test succeeding.
If no test is specified, the attribute's value will be evaluated as
a boolean.
Example usage:
.. sourcecode:: jinja
{{ users|selectattr("is_active") }}
{{ users|selectattr("email", "none") }}
Similar to a generator comprehension such as:
.. code-block:: python
(u for user in users if user.is_active)
(u for user in users if test_none(user.email))
.. versionadded:: 2.7
"""
return select_or_reject(args, kwargs, lambda x: x, True)
@contextfilter
def do_rejectattr(*args, **kwargs):
"""Filters a sequence of objects by applying a test to the specified
attribute of each object, and rejecting the objects with the test
succeeding.
If no test is specified, the attribute's value will be evaluated as
a boolean.
.. sourcecode:: jinja
{{ users|rejectattr("is_active") }}
{{ users|rejectattr("email", "none") }}
Similar to a generator comprehension such as:
.. code-block:: python
(u for user in users if not user.is_active)
(u for user in users if not test_none(user.email))
.. versionadded:: 2.7
"""
return select_or_reject(args, kwargs, lambda x: not x, True)
@evalcontextfilter
def do_tojson(eval_ctx, value, indent=None):
"""Dumps a structure to JSON so that it's safe to use in ``<script>``
tags. It accepts the same arguments and returns a JSON string. Note that
this is available in templates through the ``|tojson`` filter which will
also mark the result as safe. Due to how this function escapes certain
characters this is safe even if used outside of ``<script>`` tags.
The following characters are escaped in strings:
- ``<``
- ``>``
- ``&``
- ``'``
This makes it safe to embed such strings in any place in HTML with the
notable exception of double quoted attributes. In that case single
quote your attributes or HTML escape it in addition.
The indent parameter can be used to enable pretty printing. Set it to
the number of spaces that the structures should be indented with.
Note that this filter is for use in HTML contexts only.
.. versionadded:: 2.9
"""
policies = eval_ctx.environment.policies
dumper = policies["json.dumps_function"]
options = policies["json.dumps_kwargs"]
if indent is not None:
options = dict(options)
options["indent"] = indent
return htmlsafe_json_dumps(value, dumper=dumper, **options)
def prepare_map(args, kwargs):
context = args[0]
seq = args[1]
default = None
if len(args) == 2 and "attribute" in kwargs:
attribute = kwargs.pop("attribute")
default = kwargs.pop("default", None)
if kwargs:
raise FilterArgumentError(
"Unexpected keyword argument %r" % next(iter(kwargs))
)
func = make_attrgetter(context.environment, attribute, default=default)
else:
try:
name = args[2]
args = args[3:]
except LookupError:
raise FilterArgumentError("map requires a filter argument")
def func(item):
return context.environment.call_filter(
name, item, args, kwargs, context=context
)
return seq, func
def prepare_select_or_reject(args, kwargs, modfunc, lookup_attr):
context = args[0]
seq = args[1]
if lookup_attr:
try:
attr = args[2]
except LookupError:
raise FilterArgumentError("Missing parameter for attribute name")
transfunc = make_attrgetter(context.environment, attr)
off = 1
else:
off = 0
def transfunc(x):
return x
try:
name = args[2 + off]
args = args[3 + off :]
def func(item):
return context.environment.call_test(name, item, args, kwargs)
except LookupError:
func = bool
return seq, lambda item: modfunc(func(transfunc(item)))
def select_or_reject(args, kwargs, modfunc, lookup_attr):
seq, func = prepare_select_or_reject(args, kwargs, modfunc, lookup_attr)
if seq:
for item in seq:
if func(item):
yield item
FILTERS = {
"abs": abs,
"attr": do_attr,
"batch": do_batch,
"capitalize": do_capitalize,
"center": do_center,
"count": len,
"d": do_default,
"default": do_default,
"dictsort": do_dictsort,
"e": escape,
"escape": escape,
"filesizeformat": do_filesizeformat,
"first": do_first,
"float": do_float,
"forceescape": do_forceescape,
"format": do_format,
"groupby": do_groupby,
"indent": do_indent,
"int": do_int,
"join": do_join,
"last": do_last,
"length": len,
"list": do_list,
"lower": do_lower,
"map": do_map,
"min": do_min,
"max": do_max,
"pprint": do_pprint,
"random": do_random,
"reject": do_reject,
"rejectattr": do_rejectattr,
"replace": do_replace,
"reverse": do_reverse,
"round": do_round,
"safe": do_mark_safe,
"select": do_select,
"selectattr": do_selectattr,
"slice": do_slice,
"sort": do_sort,
"string": soft_unicode,
"striptags": do_striptags,
"sum": do_sum,
"title": do_title,
"trim": do_trim,
"truncate": do_truncate,
"unique": do_unique,
"upper": do_upper,
"urlencode": do_urlencode,
"urlize": do_urlize,
"wordcount": do_wordcount,
"wordwrap": do_wordwrap,
"xmlattr": do_xmlattr,
"tojson": do_tojson,
}
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/ext.py
|
# -*- coding: utf-8 -*-
"""Extension API for adding custom tags and behavior."""
import pprint
import re
from sys import version_info
from markupsafe import Markup
from . import nodes
from ._compat import iteritems
from ._compat import string_types
from ._compat import with_metaclass
from .defaults import BLOCK_END_STRING
from .defaults import BLOCK_START_STRING
from .defaults import COMMENT_END_STRING
from .defaults import COMMENT_START_STRING
from .defaults import KEEP_TRAILING_NEWLINE
from .defaults import LINE_COMMENT_PREFIX
from .defaults import LINE_STATEMENT_PREFIX
from .defaults import LSTRIP_BLOCKS
from .defaults import NEWLINE_SEQUENCE
from .defaults import TRIM_BLOCKS
from .defaults import VARIABLE_END_STRING
from .defaults import VARIABLE_START_STRING
from .environment import Environment
from .exceptions import TemplateAssertionError
from .exceptions import TemplateSyntaxError
from .nodes import ContextReference
from .runtime import concat
from .utils import contextfunction
from .utils import import_string
# the only real useful gettext functions for a Jinja template. Note
# that ugettext must be assigned to gettext as Jinja doesn't support
# non unicode strings.
GETTEXT_FUNCTIONS = ("_", "gettext", "ngettext")
_ws_re = re.compile(r"\s*\n\s*")
class ExtensionRegistry(type):
"""Gives the extension an unique identifier."""
def __new__(mcs, name, bases, d):
rv = type.__new__(mcs, name, bases, d)
rv.identifier = rv.__module__ + "." + rv.__name__
return rv
class Extension(with_metaclass(ExtensionRegistry, object)):
"""Extensions can be used to add extra functionality to the Jinja template
system at the parser level. Custom extensions are bound to an environment
but may not store environment specific data on `self`. The reason for
this is that an extension can be bound to another environment (for
overlays) by creating a copy and reassigning the `environment` attribute.
As extensions are created by the environment they cannot accept any
arguments for configuration. One may want to work around that by using
a factory function, but that is not possible as extensions are identified
by their import name. The correct way to configure the extension is
storing the configuration values on the environment. Because this way the
environment ends up acting as central configuration storage the
attributes may clash which is why extensions have to ensure that the names
they choose for configuration are not too generic. ``prefix`` for example
is a terrible name, ``fragment_cache_prefix`` on the other hand is a good
name as includes the name of the extension (fragment cache).
"""
#: if this extension parses this is the list of tags it's listening to.
tags = set()
#: the priority of that extension. This is especially useful for
#: extensions that preprocess values. A lower value means higher
#: priority.
#:
#: .. versionadded:: 2.4
priority = 100
def __init__(self, environment):
self.environment = environment
def bind(self, environment):
"""Create a copy of this extension bound to another environment."""
rv = object.__new__(self.__class__)
rv.__dict__.update(self.__dict__)
rv.environment = environment
return rv
def preprocess(self, source, name, filename=None):
"""This method is called before the actual lexing and can be used to
preprocess the source. The `filename` is optional. The return value
must be the preprocessed source.
"""
return source
def filter_stream(self, stream):
"""It's passed a :class:`~jinja2.lexer.TokenStream` that can be used
to filter tokens returned. This method has to return an iterable of
:class:`~jinja2.lexer.Token`\\s, but it doesn't have to return a
:class:`~jinja2.lexer.TokenStream`.
"""
return stream
def parse(self, parser):
"""If any of the :attr:`tags` matched this method is called with the
parser as first argument. The token the parser stream is pointing at
is the name token that matched. This method has to return one or a
list of multiple nodes.
"""
raise NotImplementedError()
def attr(self, name, lineno=None):
"""Return an attribute node for the current extension. This is useful
to pass constants on extensions to generated template code.
::
self.attr('_my_attribute', lineno=lineno)
"""
return nodes.ExtensionAttribute(self.identifier, name, lineno=lineno)
def call_method(
self, name, args=None, kwargs=None, dyn_args=None, dyn_kwargs=None, lineno=None
):
"""Call a method of the extension. This is a shortcut for
:meth:`attr` + :class:`jinja2.nodes.Call`.
"""
if args is None:
args = []
if kwargs is None:
kwargs = []
return nodes.Call(
self.attr(name, lineno=lineno),
args,
kwargs,
dyn_args,
dyn_kwargs,
lineno=lineno,
)
@contextfunction
def _gettext_alias(__context, *args, **kwargs):
return __context.call(__context.resolve("gettext"), *args, **kwargs)
def _make_new_gettext(func):
@contextfunction
def gettext(__context, __string, **variables):
rv = __context.call(func, __string)
if __context.eval_ctx.autoescape:
rv = Markup(rv)
# Always treat as a format string, even if there are no
# variables. This makes translation strings more consistent
# and predictable. This requires escaping
return rv % variables
return gettext
def _make_new_ngettext(func):
@contextfunction
def ngettext(__context, __singular, __plural, __num, **variables):
variables.setdefault("num", __num)
rv = __context.call(func, __singular, __plural, __num)
if __context.eval_ctx.autoescape:
rv = Markup(rv)
# Always treat as a format string, see gettext comment above.
return rv % variables
return ngettext
class InternationalizationExtension(Extension):
"""This extension adds gettext support to Jinja."""
tags = {"trans"}
# TODO: the i18n extension is currently reevaluating values in a few
# situations. Take this example:
# {% trans count=something() %}{{ count }} foo{% pluralize
# %}{{ count }} fooss{% endtrans %}
# something is called twice here. One time for the gettext value and
# the other time for the n-parameter of the ngettext function.
def __init__(self, environment):
Extension.__init__(self, environment)
environment.globals["_"] = _gettext_alias
environment.extend(
install_gettext_translations=self._install,
install_null_translations=self._install_null,
install_gettext_callables=self._install_callables,
uninstall_gettext_translations=self._uninstall,
extract_translations=self._extract,
newstyle_gettext=False,
)
def _install(self, translations, newstyle=None):
gettext = getattr(translations, "ugettext", None)
if gettext is None:
gettext = translations.gettext
ngettext = getattr(translations, "ungettext", None)
if ngettext is None:
ngettext = translations.ngettext
self._install_callables(gettext, ngettext, newstyle)
def _install_null(self, newstyle=None):
self._install_callables(
lambda x: x, lambda s, p, n: (n != 1 and (p,) or (s,))[0], newstyle
)
def _install_callables(self, gettext, ngettext, newstyle=None):
if newstyle is not None:
self.environment.newstyle_gettext = newstyle
if self.environment.newstyle_gettext:
gettext = _make_new_gettext(gettext)
ngettext = _make_new_ngettext(ngettext)
self.environment.globals.update(gettext=gettext, ngettext=ngettext)
def _uninstall(self, translations):
for key in "gettext", "ngettext":
self.environment.globals.pop(key, None)
def _extract(self, source, gettext_functions=GETTEXT_FUNCTIONS):
if isinstance(source, string_types):
source = self.environment.parse(source)
return extract_from_ast(source, gettext_functions)
def parse(self, parser):
"""Parse a translatable tag."""
lineno = next(parser.stream).lineno
num_called_num = False
# find all the variables referenced. Additionally a variable can be
# defined in the body of the trans block too, but this is checked at
# a later state.
plural_expr = None
plural_expr_assignment = None
variables = {}
trimmed = None
while parser.stream.current.type != "block_end":
if variables:
parser.stream.expect("comma")
# skip colon for python compatibility
if parser.stream.skip_if("colon"):
break
name = parser.stream.expect("name")
if name.value in variables:
parser.fail(
"translatable variable %r defined twice." % name.value,
name.lineno,
exc=TemplateAssertionError,
)
# expressions
if parser.stream.current.type == "assign":
next(parser.stream)
variables[name.value] = var = parser.parse_expression()
elif trimmed is None and name.value in ("trimmed", "notrimmed"):
trimmed = name.value == "trimmed"
continue
else:
variables[name.value] = var = nodes.Name(name.value, "load")
if plural_expr is None:
if isinstance(var, nodes.Call):
plural_expr = nodes.Name("_trans", "load")
variables[name.value] = plural_expr
plural_expr_assignment = nodes.Assign(
nodes.Name("_trans", "store"), var
)
else:
plural_expr = var
num_called_num = name.value == "num"
parser.stream.expect("block_end")
plural = None
have_plural = False
referenced = set()
# now parse until endtrans or pluralize
singular_names, singular = self._parse_block(parser, True)
if singular_names:
referenced.update(singular_names)
if plural_expr is None:
plural_expr = nodes.Name(singular_names[0], "load")
num_called_num = singular_names[0] == "num"
# if we have a pluralize block, we parse that too
if parser.stream.current.test("name:pluralize"):
have_plural = True
next(parser.stream)
if parser.stream.current.type != "block_end":
name = parser.stream.expect("name")
if name.value not in variables:
parser.fail(
"unknown variable %r for pluralization" % name.value,
name.lineno,
exc=TemplateAssertionError,
)
plural_expr = variables[name.value]
num_called_num = name.value == "num"
parser.stream.expect("block_end")
plural_names, plural = self._parse_block(parser, False)
next(parser.stream)
referenced.update(plural_names)
else:
next(parser.stream)
# register free names as simple name expressions
for var in referenced:
if var not in variables:
variables[var] = nodes.Name(var, "load")
if not have_plural:
plural_expr = None
elif plural_expr is None:
parser.fail("pluralize without variables", lineno)
if trimmed is None:
trimmed = self.environment.policies["ext.i18n.trimmed"]
if trimmed:
singular = self._trim_whitespace(singular)
if plural:
plural = self._trim_whitespace(plural)
node = self._make_node(
singular,
plural,
variables,
plural_expr,
bool(referenced),
num_called_num and have_plural,
)
node.set_lineno(lineno)
if plural_expr_assignment is not None:
return [plural_expr_assignment, node]
else:
return node
def _trim_whitespace(self, string, _ws_re=_ws_re):
return _ws_re.sub(" ", string.strip())
def _parse_block(self, parser, allow_pluralize):
"""Parse until the next block tag with a given name."""
referenced = []
buf = []
while 1:
if parser.stream.current.type == "data":
buf.append(parser.stream.current.value.replace("%", "%%"))
next(parser.stream)
elif parser.stream.current.type == "variable_begin":
next(parser.stream)
name = parser.stream.expect("name").value
referenced.append(name)
buf.append("%%(%s)s" % name)
parser.stream.expect("variable_end")
elif parser.stream.current.type == "block_begin":
next(parser.stream)
if parser.stream.current.test("name:endtrans"):
break
elif parser.stream.current.test("name:pluralize"):
if allow_pluralize:
break
parser.fail(
"a translatable section can have only one pluralize section"
)
parser.fail(
"control structures in translatable sections are not allowed"
)
elif parser.stream.eos:
parser.fail("unclosed translation block")
else:
raise RuntimeError("internal parser error")
return referenced, concat(buf)
def _make_node(
self, singular, plural, variables, plural_expr, vars_referenced, num_called_num
):
"""Generates a useful node from the data provided."""
# no variables referenced? no need to escape for old style
# gettext invocations only if there are vars.
if not vars_referenced and not self.environment.newstyle_gettext:
singular = singular.replace("%%", "%")
if plural:
plural = plural.replace("%%", "%")
# singular only:
if plural_expr is None:
gettext = nodes.Name("gettext", "load")
node = nodes.Call(gettext, [nodes.Const(singular)], [], None, None)
# singular and plural
else:
ngettext = nodes.Name("ngettext", "load")
node = nodes.Call(
ngettext,
[nodes.Const(singular), nodes.Const(plural), plural_expr],
[],
None,
None,
)
# in case newstyle gettext is used, the method is powerful
# enough to handle the variable expansion and autoescape
# handling itself
if self.environment.newstyle_gettext:
for key, value in iteritems(variables):
# the function adds that later anyways in case num was
# called num, so just skip it.
if num_called_num and key == "num":
continue
node.kwargs.append(nodes.Keyword(key, value))
# otherwise do that here
else:
# mark the return value as safe if we are in an
# environment with autoescaping turned on
node = nodes.MarkSafeIfAutoescape(node)
if variables:
node = nodes.Mod(
node,
nodes.Dict(
[
nodes.Pair(nodes.Const(key), value)
for key, value in variables.items()
]
),
)
return nodes.Output([node])
class ExprStmtExtension(Extension):
"""Adds a `do` tag to Jinja that works like the print statement just
that it doesn't print the return value.
"""
tags = set(["do"])
def parse(self, parser):
node = nodes.ExprStmt(lineno=next(parser.stream).lineno)
node.node = parser.parse_tuple()
return node
class LoopControlExtension(Extension):
"""Adds break and continue to the template engine."""
tags = set(["break", "continue"])
def parse(self, parser):
token = next(parser.stream)
if token.value == "break":
return nodes.Break(lineno=token.lineno)
return nodes.Continue(lineno=token.lineno)
class WithExtension(Extension):
pass
class AutoEscapeExtension(Extension):
pass
class DebugExtension(Extension):
"""A ``{% debug %}`` tag that dumps the available variables,
filters, and tests.
.. code-block:: html+jinja
<pre>{% debug %}</pre>
.. code-block:: text
{'context': {'cycler': <class 'jinja2.utils.Cycler'>,
...,
'namespace': <class 'jinja2.utils.Namespace'>},
'filters': ['abs', 'attr', 'batch', 'capitalize', 'center', 'count', 'd',
..., 'urlencode', 'urlize', 'wordcount', 'wordwrap', 'xmlattr'],
'tests': ['!=', '<', '<=', '==', '>', '>=', 'callable', 'defined',
..., 'odd', 'sameas', 'sequence', 'string', 'undefined', 'upper']}
.. versionadded:: 2.11.0
"""
tags = {"debug"}
def parse(self, parser):
lineno = parser.stream.expect("name:debug").lineno
context = ContextReference()
result = self.call_method("_render", [context], lineno=lineno)
return nodes.Output([result], lineno=lineno)
def _render(self, context):
result = {
"context": context.get_all(),
"filters": sorted(self.environment.filters.keys()),
"tests": sorted(self.environment.tests.keys()),
}
# Set the depth since the intent is to show the top few names.
if version_info[:2] >= (3, 4):
return pprint.pformat(result, depth=3, compact=True)
else:
return pprint.pformat(result, depth=3)
def extract_from_ast(node, gettext_functions=GETTEXT_FUNCTIONS, babel_style=True):
"""Extract localizable strings from the given template node. Per
default this function returns matches in babel style that means non string
parameters as well as keyword arguments are returned as `None`. This
allows Babel to figure out what you really meant if you are using
gettext functions that allow keyword arguments for placeholder expansion.
If you don't want that behavior set the `babel_style` parameter to `False`
which causes only strings to be returned and parameters are always stored
in tuples. As a consequence invalid gettext calls (calls without a single
string parameter or string parameters after non-string parameters) are
skipped.
This example explains the behavior:
>>> from jinja2 import Environment
>>> env = Environment()
>>> node = env.parse('{{ (_("foo"), _(), ngettext("foo", "bar", 42)) }}')
>>> list(extract_from_ast(node))
[(1, '_', 'foo'), (1, '_', ()), (1, 'ngettext', ('foo', 'bar', None))]
>>> list(extract_from_ast(node, babel_style=False))
[(1, '_', ('foo',)), (1, 'ngettext', ('foo', 'bar'))]
For every string found this function yields a ``(lineno, function,
message)`` tuple, where:
* ``lineno`` is the number of the line on which the string was found,
* ``function`` is the name of the ``gettext`` function used (if the
string was extracted from embedded Python code), and
* ``message`` is the string itself (a ``unicode`` object, or a tuple
of ``unicode`` objects for functions with multiple string arguments).
This extraction function operates on the AST and is because of that unable
to extract any comments. For comment support you have to use the babel
extraction interface or extract comments yourself.
"""
for node in node.find_all(nodes.Call):
if (
not isinstance(node.node, nodes.Name)
or node.node.name not in gettext_functions
):
continue
strings = []
for arg in node.args:
if isinstance(arg, nodes.Const) and isinstance(arg.value, string_types):
strings.append(arg.value)
else:
strings.append(None)
for _ in node.kwargs:
strings.append(None)
if node.dyn_args is not None:
strings.append(None)
if node.dyn_kwargs is not None:
strings.append(None)
if not babel_style:
strings = tuple(x for x in strings if x is not None)
if not strings:
continue
else:
if len(strings) == 1:
strings = strings[0]
else:
strings = tuple(strings)
yield node.lineno, node.node.name, strings
class _CommentFinder(object):
"""Helper class to find comments in a token stream. Can only
find comments for gettext calls forwards. Once the comment
from line 4 is found, a comment for line 1 will not return a
usable value.
"""
def __init__(self, tokens, comment_tags):
self.tokens = tokens
self.comment_tags = comment_tags
self.offset = 0
self.last_lineno = 0
def find_backwards(self, offset):
try:
for _, token_type, token_value in reversed(
self.tokens[self.offset : offset]
):
if token_type in ("comment", "linecomment"):
try:
prefix, comment = token_value.split(None, 1)
except ValueError:
continue
if prefix in self.comment_tags:
return [comment.rstrip()]
return []
finally:
self.offset = offset
def find_comments(self, lineno):
if not self.comment_tags or self.last_lineno > lineno:
return []
for idx, (token_lineno, _, _) in enumerate(self.tokens[self.offset :]):
if token_lineno > lineno:
return self.find_backwards(self.offset + idx)
return self.find_backwards(len(self.tokens))
def babel_extract(fileobj, keywords, comment_tags, options):
"""Babel extraction method for Jinja templates.
.. versionchanged:: 2.3
Basic support for translation comments was added. If `comment_tags`
is now set to a list of keywords for extraction, the extractor will
try to find the best preceding comment that begins with one of the
keywords. For best results, make sure to not have more than one
gettext call in one line of code and the matching comment in the
same line or the line before.
.. versionchanged:: 2.5.1
The `newstyle_gettext` flag can be set to `True` to enable newstyle
gettext calls.
.. versionchanged:: 2.7
A `silent` option can now be provided. If set to `False` template
syntax errors are propagated instead of being ignored.
:param fileobj: the file-like object the messages should be extracted from
:param keywords: a list of keywords (i.e. function names) that should be
recognized as translation functions
:param comment_tags: a list of translator tags to search for and include
in the results.
:param options: a dictionary of additional options (optional)
:return: an iterator over ``(lineno, funcname, message, comments)`` tuples.
(comments will be empty currently)
"""
extensions = set()
for extension in options.get("extensions", "").split(","):
extension = extension.strip()
if not extension:
continue
extensions.add(import_string(extension))
if InternationalizationExtension not in extensions:
extensions.add(InternationalizationExtension)
def getbool(options, key, default=False):
return options.get(key, str(default)).lower() in ("1", "on", "yes", "true")
silent = getbool(options, "silent", True)
environment = Environment(
options.get("block_start_string", BLOCK_START_STRING),
options.get("block_end_string", BLOCK_END_STRING),
options.get("variable_start_string", VARIABLE_START_STRING),
options.get("variable_end_string", VARIABLE_END_STRING),
options.get("comment_start_string", COMMENT_START_STRING),
options.get("comment_end_string", COMMENT_END_STRING),
options.get("line_statement_prefix") or LINE_STATEMENT_PREFIX,
options.get("line_comment_prefix") or LINE_COMMENT_PREFIX,
getbool(options, "trim_blocks", TRIM_BLOCKS),
getbool(options, "lstrip_blocks", LSTRIP_BLOCKS),
NEWLINE_SEQUENCE,
getbool(options, "keep_trailing_newline", KEEP_TRAILING_NEWLINE),
frozenset(extensions),
cache_size=0,
auto_reload=False,
)
if getbool(options, "trimmed"):
environment.policies["ext.i18n.trimmed"] = True
if getbool(options, "newstyle_gettext"):
environment.newstyle_gettext = True
source = fileobj.read().decode(options.get("encoding", "utf-8"))
try:
node = environment.parse(source)
tokens = list(environment.lex(environment.preprocess(source)))
except TemplateSyntaxError:
if not silent:
raise
# skip templates with syntax errors
return
finder = _CommentFinder(tokens, comment_tags)
for lineno, func, message in extract_from_ast(node, keywords):
yield lineno, func, message, finder.find_comments(lineno)
#: nicer import names
i18n = InternationalizationExtension
do = ExprStmtExtension
loopcontrols = LoopControlExtension
with_ = WithExtension
autoescape = AutoEscapeExtension
debug = DebugExtension
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/meta.py
|
# -*- coding: utf-8 -*-
"""Functions that expose information about templates that might be
interesting for introspection.
"""
from . import nodes
from ._compat import iteritems
from ._compat import string_types
from .compiler import CodeGenerator
class TrackingCodeGenerator(CodeGenerator):
"""We abuse the code generator for introspection."""
def __init__(self, environment):
CodeGenerator.__init__(self, environment, "<introspection>", "<introspection>")
self.undeclared_identifiers = set()
def write(self, x):
"""Don't write."""
def enter_frame(self, frame):
"""Remember all undeclared identifiers."""
CodeGenerator.enter_frame(self, frame)
for _, (action, param) in iteritems(frame.symbols.loads):
if action == "resolve" and param not in self.environment.globals:
self.undeclared_identifiers.add(param)
def find_undeclared_variables(ast):
"""Returns a set of all variables in the AST that will be looked up from
the context at runtime. Because at compile time it's not known which
variables will be used depending on the path the execution takes at
runtime, all variables are returned.
>>> from jinja2 import Environment, meta
>>> env = Environment()
>>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}')
>>> meta.find_undeclared_variables(ast) == set(['bar'])
True
.. admonition:: Implementation
Internally the code generator is used for finding undeclared variables.
This is good to know because the code generator might raise a
:exc:`TemplateAssertionError` during compilation and as a matter of
fact this function can currently raise that exception as well.
"""
codegen = TrackingCodeGenerator(ast.environment)
codegen.visit(ast)
return codegen.undeclared_identifiers
def find_referenced_templates(ast):
"""Finds all the referenced templates from the AST. This will return an
iterator over all the hardcoded template extensions, inclusions and
imports. If dynamic inheritance or inclusion is used, `None` will be
yielded.
>>> from jinja2 import Environment, meta
>>> env = Environment()
>>> ast = env.parse('{% extends "layout.html" %}{% include helper %}')
>>> list(meta.find_referenced_templates(ast))
['layout.html', None]
This function is useful for dependency tracking. For example if you want
to rebuild parts of the website after a layout template has changed.
"""
for node in ast.find_all(
(nodes.Extends, nodes.FromImport, nodes.Import, nodes.Include)
):
if not isinstance(node.template, nodes.Const):
# a tuple with some non consts in there
if isinstance(node.template, (nodes.Tuple, nodes.List)):
for template_name in node.template.items:
# something const, only yield the strings and ignore
# non-string consts that really just make no sense
if isinstance(template_name, nodes.Const):
if isinstance(template_name.value, string_types):
yield template_name.value
# something dynamic in there
else:
yield None
# something dynamic we don't know about here
else:
yield None
continue
# constant is a basestring, direct template name
if isinstance(node.template.value, string_types):
yield node.template.value
# a tuple or list (latter *should* not happen) made of consts,
# yield the consts that are strings. We could warn here for
# non string values
elif isinstance(node, nodes.Include) and isinstance(
node.template.value, (tuple, list)
):
for template_name in node.template.value:
if isinstance(template_name, string_types):
yield template_name
# something else we don't care about, we could warn here
else:
yield None
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/jinja2/asyncfilters.py
|
from functools import wraps
from . import filters
from .asyncsupport import auto_aiter
from .asyncsupport import auto_await
async def auto_to_seq(value):
seq = []
if hasattr(value, "__aiter__"):
async for item in value:
seq.append(item)
else:
for item in value:
seq.append(item)
return seq
async def async_select_or_reject(args, kwargs, modfunc, lookup_attr):
seq, func = filters.prepare_select_or_reject(args, kwargs, modfunc, lookup_attr)
if seq:
async for item in auto_aiter(seq):
if func(item):
yield item
def dualfilter(normal_filter, async_filter):
wrap_evalctx = False
if getattr(normal_filter, "environmentfilter", False) is True:
def is_async(args):
return args[0].is_async
wrap_evalctx = False
else:
has_evalctxfilter = getattr(normal_filter, "evalcontextfilter", False) is True
has_ctxfilter = getattr(normal_filter, "contextfilter", False) is True
wrap_evalctx = not has_evalctxfilter and not has_ctxfilter
def is_async(args):
return args[0].environment.is_async
@wraps(normal_filter)
def wrapper(*args, **kwargs):
b = is_async(args)
if wrap_evalctx:
args = args[1:]
if b:
return async_filter(*args, **kwargs)
return normal_filter(*args, **kwargs)
if wrap_evalctx:
wrapper.evalcontextfilter = True
wrapper.asyncfiltervariant = True
return wrapper
def asyncfiltervariant(original):
def decorator(f):
return dualfilter(original, f)
return decorator
@asyncfiltervariant(filters.do_first)
async def do_first(environment, seq):
try:
return await auto_aiter(seq).__anext__()
except StopAsyncIteration:
return environment.undefined("No first item, sequence was empty.")
@asyncfiltervariant(filters.do_groupby)
async def do_groupby(environment, value, attribute):
expr = filters.make_attrgetter(environment, attribute)
return [
filters._GroupTuple(key, await auto_to_seq(values))
for key, values in filters.groupby(
sorted(await auto_to_seq(value), key=expr), expr
)
]
@asyncfiltervariant(filters.do_join)
async def do_join(eval_ctx, value, d=u"", attribute=None):
return filters.do_join(eval_ctx, await auto_to_seq(value), d, attribute)
@asyncfiltervariant(filters.do_list)
async def do_list(value):
return await auto_to_seq(value)
@asyncfiltervariant(filters.do_reject)
async def do_reject(*args, **kwargs):
return async_select_or_reject(args, kwargs, lambda x: not x, False)
@asyncfiltervariant(filters.do_rejectattr)
async def do_rejectattr(*args, **kwargs):
return async_select_or_reject(args, kwargs, lambda x: not x, True)
@asyncfiltervariant(filters.do_select)
async def do_select(*args, **kwargs):
return async_select_or_reject(args, kwargs, lambda x: x, False)
@asyncfiltervariant(filters.do_selectattr)
async def do_selectattr(*args, **kwargs):
return async_select_or_reject(args, kwargs, lambda x: x, True)
@asyncfiltervariant(filters.do_map)
async def do_map(*args, **kwargs):
seq, func = filters.prepare_map(args, kwargs)
if seq:
async for item in auto_aiter(seq):
yield await auto_await(func(item))
@asyncfiltervariant(filters.do_sum)
async def do_sum(environment, iterable, attribute=None, start=0):
rv = start
if attribute is not None:
func = filters.make_attrgetter(environment, attribute)
else:
def func(x):
return x
async for item in auto_aiter(iterable):
rv += func(item)
return rv
@asyncfiltervariant(filters.do_slice)
async def do_slice(value, slices, fill_with=None):
return filters.do_slice(await auto_to_seq(value), slices, fill_with)
ASYNC_FILTERS = {
"first": do_first,
"groupby": do_groupby,
"join": do_join,
"list": do_list,
# we intentionally do not support do_last because that would be
# ridiculous
"reject": do_reject,
"rejectattr": do_rejectattr,
"map": do_map,
"select": do_select,
"selectattr": do_selectattr,
"sum": do_sum,
"slice": do_slice,
}
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/RECORD
|
../../Scripts/pycodestyle.exe,sha256=fdbGTYHwCLCxptp601QtYwNwlJUqKY7-_m8PQ_sQTDA,106414
__pycache__/pycodestyle.cpython-39.pyc,,
pycodestyle-2.7.0.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4
pycodestyle-2.7.0.dist-info/LICENSE,sha256=93IpXoGvNHjTTojlLQdiACMOx91qOeEjvFyzWqZqva4,1254
pycodestyle-2.7.0.dist-info/METADATA,sha256=WdOOoSuCvtYW3th4O3eKe-d995kHd_QNbJVNxVFjAQA,30597
pycodestyle-2.7.0.dist-info/RECORD,,
pycodestyle-2.7.0.dist-info/WHEEL,sha256=Z-nyYpwrcSqxfdux5Mbn_DQ525iP7J2DG3JgGvOYyTQ,110
pycodestyle-2.7.0.dist-info/entry_points.txt,sha256=6JU_7SAppC93MBSQi1_QxDwEQUyg6cgK71ab9q_Hxco,51
pycodestyle-2.7.0.dist-info/namespace_packages.txt,sha256=AbpHGcgLb-kRsJGnwFEktk7uzpZOCcBY74-YBdrKVGs,1
pycodestyle-2.7.0.dist-info/top_level.txt,sha256=rHbIEiXmvsJ016mFcLVcF_d-dKgP3VdfOB6CWbivZug,12
pycodestyle.py,sha256=hnconAdzFCx6bjc3KWR66Aa5HCHWfW9TeloG2r5aRx8,104395
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/LICENSE
|
Copyright © 2006-2009 Johann C. Rocholl <johann@rocholl.net>
Copyright © 2009-2014 Florent Xicluna <florent.xicluna@gmail.com>
Copyright © 2014-2020 Ian Lee <IanLee1521@gmail.com>
Licensed under the terms of the Expat License
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/namespace_packages.txt
| 0 |
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/WHEEL
|
Wheel-Version: 1.0
Generator: bdist_wheel (0.36.2)
Root-Is-Purelib: true
Tag: py2-none-any
Tag: py3-none-any
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/entry_points.txt
|
[console_scripts]
pycodestyle = pycodestyle:_main
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/top_level.txt
|
pycodestyle
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/INSTALLER
|
pip
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/pycodestyle-2.7.0.dist-info/METADATA
|
Metadata-Version: 2.1
Name: pycodestyle
Version: 2.7.0
Summary: Python style guide checker
Home-page: https://pycodestyle.pycqa.org/
Author: Johann C. Rocholl
Author-email: johann@rocholl.net
Maintainer: Ian Lee
Maintainer-email: IanLee1521@gmail.com
License: Expat license
Project-URL: Changes, https://pycodestyle.pycqa.org/en/latest/developer.html#changes
Keywords: pycodestyle,pep8,PEP 8,PEP-8,PEP8
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
pycodestyle (formerly called pep8) - Python style guide checker
===============================================================
.. image:: https://img.shields.io/travis/PyCQA/pycodestyle.svg
:target: https://travis-ci.org/PyCQA/pycodestyle
:alt: Build status
.. image:: https://readthedocs.org/projects/pycodestyle/badge/?version=latest
:target: https://pycodestyle.pycqa.org
:alt: Documentation Status
.. image:: https://img.shields.io/pypi/wheel/pycodestyle.svg
:target: https://pypi.org/project/pycodestyle/
:alt: Wheel Status
.. image:: https://badges.gitter.im/PyCQA/pycodestyle.svg
:alt: Join the chat at https://gitter.im/PyCQA/pycodestyle
:target: https://gitter.im/PyCQA/pycodestyle?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
pycodestyle is a tool to check your Python code against some of the style
conventions in `PEP 8`_.
.. _PEP 8: http://www.python.org/dev/peps/pep-0008/
.. note::
This package used to be called ``pep8`` but was renamed to ``pycodestyle``
to reduce confusion. Further discussion can be found `in the issue where
Guido requested this
change <https://github.com/PyCQA/pycodestyle/issues/466>`_, or in the
lightning talk at PyCon 2016 by @IanLee1521:
`slides <https://speakerdeck.com/ianlee1521/pep8-vs-pep-8>`_
`video <https://youtu.be/PulzIT8KYLk?t=36m>`_.
Features
--------
* Plugin architecture: Adding new checks is easy.
* Parseable output: Jump to error location in your editor.
* Small: Just one Python file, requires only stdlib. You can use just
the ``pycodestyle.py`` file for this purpose.
* Comes with a comprehensive test suite.
Installation
------------
You can install, upgrade, and uninstall ``pycodestyle.py`` with these commands::
$ pip install pycodestyle
$ pip install --upgrade pycodestyle
$ pip uninstall pycodestyle
There's also a package for Debian/Ubuntu, but it's not always the
latest version.
Example usage and output
------------------------
::
$ pycodestyle --first optparse.py
optparse.py:69:11: E401 multiple imports on one line
optparse.py:77:1: E302 expected 2 blank lines, found 1
optparse.py:88:5: E301 expected 1 blank line, found 0
optparse.py:222:34: W602 deprecated form of raising exception
optparse.py:347:31: E211 whitespace before '('
optparse.py:357:17: E201 whitespace after '{'
optparse.py:472:29: E221 multiple spaces before operator
optparse.py:544:21: W601 .has_key() is deprecated, use 'in'
You can also make ``pycodestyle.py`` show the source code for each error, and
even the relevant text from PEP 8::
$ pycodestyle --show-source --show-pep8 testsuite/E40.py
testsuite/E40.py:2:10: E401 multiple imports on one line
import os, sys
^
Imports should usually be on separate lines.
Okay: import os\nimport sys
E401: import sys, os
Or you can display how often each error was found::
$ pycodestyle --statistics -qq Python-2.5/Lib
232 E201 whitespace after '['
599 E202 whitespace before ')'
631 E203 whitespace before ','
842 E211 whitespace before '('
2531 E221 multiple spaces before operator
4473 E301 expected 1 blank line, found 0
4006 E302 expected 2 blank lines, found 1
165 E303 too many blank lines (4)
325 E401 multiple imports on one line
3615 E501 line too long (82 characters)
612 W601 .has_key() is deprecated, use 'in'
1188 W602 deprecated form of raising exception
Links
-----
* `Read the documentation <https://pycodestyle.pycqa.org/>`_
* `Fork me on GitHub <http://github.com/PyCQA/pycodestyle>`_
Changelog
=========
2.7.0 (2021-03-14)
------------------
Changes:
* Fix physical checks (such as W191) at end of file. PR #961.
* Add ``--indent-size`` option (defaulting to ``4``). PR #970.
* W605: fix escaped crlf false positive on windows. PR #976.
2.6.0 (2020-05-11)
------------------
Announcements:
* Anthony Sottile (@asottile) joined the team as a core developer. :tada:
Changes:
* E306: fix detection inside ``async def``. PR #929.
* E301: fix regression disallowing decorated one-liners. PR #927.
* E714: fix false positive with chained ``is not``. PR #931.
2.6.0a1 (2020-04-23)
--------------------
New checks:
* E225: require whitespace around ``and`` ``in`` ``is`` and ``or``. PR #847.
Changes:
* E117: fix indentation using tabs by treating as 8-space indents. PR #837.
* E721: fix false positive with names containg ``istype``. PR #850.
* E741: allow ``l`` as a named argument in a function call. PR #853.
* E302: fix false-negative with decorated functions. PR #859.
* W504: ellipsis (``...``) is no longer treated as a binary operator. PR #875.
* E402: allow ``with``, ``if``, ``elif``, ``else`` to guard imports. PR #834.
* Add support for assignment expressions ``:=`` (PEP 572). PR #879.
* Add support for positional-only arguments ``/`` (PEP 570). PR #872, #918.
* Add support for python 3.8.
* Add support for matrix multiplication operator ``@`` (PEP 465). PR #897.
* Support visual indent for continuation lines for ``with`` / ``assert`` /
``raise``. PR #912.
* E302: allow two blank lines after a block of one-liners. PR #913.
* E302: allow two-and-fewer newlines at the top of the file. PR #919.
2.5.0 (2019-01-29)
------------------
New checks:
* E117: Over-indented code blocks
* W505: Maximum doc-string length only when configured with --max-doc-length
Changes:
* Remove support for EOL Python 2.6 and 3.3. PR #720.
* Add E117 error for over-indented code blocks.
* Allow W605 to be silenced by `# noqa` and fix the position reported by W605
* Allow users to omit blank lines around one-liner definitions of classes and
functions
* Include the function return annotation (``->``) as requiring surrounding
whitespace only on Python 3
* Verify that only names can follow ``await``. Previously we allowed numbers
and strings.
* Add support for Python 3.7
* Fix detection of annotated argument defaults for E252
* Correct the position reported by W504
2.4.0 (2018-04-10)
------------------
New checks:
* Add W504 warning for checking that a break doesn't happen after a binary
operator. This check is ignored by default. PR #502.
* Add W605 warning for invalid escape sequences in string literals. PR #676.
* Add W606 warning for 'async' and 'await' reserved keywords being introduced
in Python 3.7. PR #684.
* Add E252 error for missing whitespace around equal sign in type annotated
function arguments with defaults values. PR #717.
Changes:
* An internal bisect search has replaced a linear search in order to improve
efficiency. PR #648.
* pycodestyle now uses PyPI trove classifiers in order to document supported
python versions on PyPI. PR #654.
* 'setup.cfg' '[wheel]' section has been renamed to '[bdist_wheel]', as
the former is legacy. PR #653.
* pycodestyle now handles very long lines much more efficiently for python
3.2+. Fixes #643. PR #644.
* You can now write 'pycodestyle.StyleGuide(verbose=True)' instead of
'pycodestyle.StyleGuide(verbose=True, paths=['-v'])' in order to achieve
verbosity. PR #663.
* The distribution of pycodestyle now includes the license text in order to
comply with open source licenses which require this. PR #694.
* 'maximum_line_length' now ignores shebang ('#!') lines. PR #736.
* Add configuration option for the allowed number of blank lines. It is
implemented as a top level dictionary which can be easily overwritten. Fixes
#732. PR #733.
Bugs:
* Prevent a 'DeprecationWarning', and a 'SyntaxError' in future python, caused
by an invalid escape sequence. PR #625.
* Correctly report E501 when the first line of a docstring is too long.
Resolves #622. PR #630.
* Support variable annotation when variable start by a keyword, such as class
variable type annotations in python 3.6. PR #640.
* pycodestyle internals have been changed in order to allow 'python3 -m
cProfile' to report correct metrics. PR #647.
* Fix a spelling mistake in the description of E722. PR #697.
* 'pycodestyle --diff' now does not break if your 'gitconfig' enables
'mnemonicprefix'. PR #706.
2.3.1 (2017-01-31)
------------------
Bugs:
* Fix regression in detection of E302 and E306; #618, #620
2.3.0 (2017-01-30)
------------------
New Checks:
* Add E722 warning for bare ``except`` clauses
* Report E704 for async function definitions (``async def``)
Bugs:
* Fix another E305 false positive for variables beginning with "class" or
"def"
* Fix detection of multiple spaces between ``async`` and ``def``
* Fix handling of variable annotations. Stop reporting E701 on Python 3.6 for
variable annotations.
2.2.0 (2016-11-14)
------------------
Announcements:
* Added Make target to obtain proper tarball file permissions; #599
Bugs:
* Fixed E305 regression caused by #400; #593
2.1.0 (2016-11-04)
------------------
Announcements:
* Change all references to the pep8 project to say pycodestyle; #530
Changes:
* Report E302 for blank lines before an "async def"; #556
* Update our list of tested and supported Python versions which are 2.6, 2.7,
3.2, 3.3, 3.4 and 3.5 as well as the nightly Python build and PyPy.
* Report E742 and E743 for functions and classes badly named 'l', 'O', or 'I'.
* Report E741 on 'global' and 'nonlocal' statements, as well as prohibited
single-letter variables.
* Deprecated use of `[pep8]` section name in favor of `[pycodestyle]`; #591
* Report E722 when bare except clause is used; #579
Bugs:
* Fix opt_type AssertionError when using Flake8 2.6.2 and pycodestyle; #561
* Require two blank lines after toplevel def, class; #536
* Remove accidentally quadratic computation based on the number of colons. This
will make pycodestyle faster in some cases; #314
2.0.0 (2016-05-31)
------------------
Announcements:
* Repository renamed to `pycodestyle`; Issue #466 / #481.
* Added joint Code of Conduct as member of PyCQA; #483
Changes:
* Added tox test support for Python 3.5 and pypy3
* Added check E275 for whitespace on `from ... import ...` lines; #489 / #491
* Added W503 to the list of codes ignored by default ignore list; #498
* Removed use of project level `.pep8` configuration file; #364
Bugs:
* Fixed bug with treating `~` operator as binary; #383 / #384
* Identify binary operators as unary; #484 / #485
1.7.0 (2016-01-12)
------------------
Announcements:
* Repository moved to PyCQA Organization on GitHub:
https://github.com/pycqa/pep8
Changes:
* Reverted the fix in #368, "options passed on command line are only ones
accepted" feature. This has many unintended consequences in pep8 and flake8
and needs to be reworked when I have more time.
* Added support for Python 3.5. (Issue #420 & #459)
* Added support for multi-line config_file option parsing. (Issue #429)
* Improved parameter parsing. (Issues #420 & #456)
Bugs:
* Fixed BytesWarning on Python 3. (Issue #459)
1.6.2 (2015-02-15)
------------------
Changes:
* Added check for breaking around a binary operator. (Issue #197, Pull #305)
Bugs:
* Restored config_file parameter in process_options(). (Issue #380)
1.6.1 (2015-02-08)
------------------
Changes:
* Assign variables before referenced. (Issue #287)
Bugs:
* Exception thrown due to unassigned ``local_dir`` variable. (Issue #377)
1.6.0 (2015-02-06)
------------------
News:
* Ian Lee <ianlee1521@gmail.com> joined the project as a maintainer.
Changes:
* Report E731 for lambda assignment. (Issue #277)
* Report E704 for one-liner def instead of E701.
Do not report this error in the default configuration. (Issue #277)
* Replace codes E111, E112 and E113 with codes E114, E115 and E116
for bad indentation of comments. (Issue #274)
* Report E266 instead of E265 when the block comment starts with
multiple ``#``. (Issue #270)
* Report E402 for import statements not at the top of the file. (Issue #264)
* Do not enforce whitespaces around ``**`` operator. (Issue #292)
* Strip whitespace from around paths during normalization. (Issue #339 / #343)
* Update ``--format`` documentation. (Issue #198 / Pull Request #310)
* Add ``.tox/`` to default excludes. (Issue #335)
* Do not report E121 or E126 in the default configuration. (Issues #256 / #316)
* Allow spaces around the equals sign in an annotated function. (Issue #357)
* Allow trailing backslash if in an inline comment. (Issue #374)
* If ``--config`` is used, only that configuration is processed. Otherwise,
merge the user and local configurations are merged. (Issue #368 / #369)
Bug fixes:
* Don't crash if Checker.build_tokens_line() returns None. (Issue #306)
* Don't crash if os.path.expanduser() throws an ImportError. (Issue #297)
* Missing space around keyword parameter equal not always reported, E251.
(Issue #323)
* Fix false positive E711/E712/E713. (Issues #330 and #336)
* Do not skip physical checks if the newline is escaped. (Issue #319)
* Flush sys.stdout to avoid race conditions with printing. See flake8 bug:
https://gitlab.com/pycqa/flake8/issues/17 for more details. (Issue #363)
1.5.7 (2014-05-29)
------------------
Bug fixes:
* Skip the traceback on "Broken pipe" signal. (Issue #275)
* Do not exit when an option in ``setup.cfg`` or ``tox.ini``
is not recognized.
* Check the last line even if it does not end with a newline. (Issue #286)
* Always open files in universal newlines mode in Python 2. (Issue #288)
1.5.6 (2014-04-14)
------------------
Bug fixes:
* Check the last line even if it has no end-of-line. (Issue #273)
1.5.5 (2014-04-10)
------------------
Bug fixes:
* Fix regression with E22 checks and inline comments. (Issue #271)
1.5.4 (2014-04-07)
------------------
Bug fixes:
* Fix negative offset with E303 before a multi-line docstring.
(Issue #269)
1.5.3 (2014-04-04)
------------------
Bug fixes:
* Fix wrong offset computation when error is on the last char
of a physical line. (Issue #268)
1.5.2 (2014-04-04)
------------------
Changes:
* Distribute a universal wheel file.
Bug fixes:
* Report correct line number for E303 with comments. (Issue #60)
* Do not allow newline after parameter equal. (Issue #252)
* Fix line number reported for multi-line strings. (Issue #220)
* Fix false positive E121/E126 with multi-line strings. (Issue #265)
* Fix E501 not detected in comments with Python 2.5.
* Fix caret position with ``--show-source`` when line contains tabs.
1.5.1 (2014-03-27)
------------------
Bug fixes:
* Fix a crash with E125 on multi-line strings. (Issue #263)
1.5 (2014-03-26)
----------------
Changes:
* Report E129 instead of E125 for visually indented line with same
indent as next logical line. (Issue #126)
* Report E265 for space before block comment. (Issue #190)
* Report E713 and E714 when operators ``not in`` and ``is not`` are
recommended. (Issue #236)
* Allow long lines in multiline strings and comments if they cannot
be wrapped. (Issue #224).
* Optionally disable physical line checks inside multiline strings,
using ``# noqa``. (Issue #242)
* Change text for E121 to report "continuation line under-indented
for hanging indent" instead of indentation not being a
multiple of 4.
* Report E131 instead of E121 / E126 if the hanging indent is not
consistent within the same continuation block. It helps when
error E121 or E126 is in the ``ignore`` list.
* Report E126 instead of E121 when the continuation line is hanging
with extra indentation, even if indentation is not a multiple of 4.
Bug fixes:
* Allow the checkers to report errors on empty files. (Issue #240)
* Fix ignoring too many checks when ``--select`` is used with codes
declared in a flake8 extension. (Issue #216)
* Fix regression with multiple brackets. (Issue #214)
* Fix ``StyleGuide`` to parse the local configuration if the
keyword argument ``paths`` is specified. (Issue #246)
* Fix a false positive E124 for hanging indent. (Issue #254)
* Fix a false positive E126 with embedded colon. (Issue #144)
* Fix a false positive E126 when indenting with tabs. (Issue #204)
* Fix behaviour when ``exclude`` is in the configuration file and
the current directory is not the project directory. (Issue #247)
* The logical checks can return ``None`` instead of an empty iterator.
(Issue #250)
* Do not report multiple E101 if only the first indentation starts
with a tab. (Issue #237)
* Fix a rare false positive W602. (Issue #34)
1.4.6 (2013-07-02)
------------------
Changes:
* Honor ``# noqa`` for errors E711 and E712. (Issue #180)
* When both a ``tox.ini`` and a ``setup.cfg`` are present in the project
directory, merge their contents. The ``tox.ini`` file takes
precedence (same as before). (Issue #182)
* Give priority to ``--select`` over ``--ignore``. (Issue #188)
* Compare full path when excluding a file. (Issue #186)
* New option ``--hang-closing`` to switch to the alternative style of
closing bracket indentation for hanging indent. Add error E133 for
closing bracket which is missing indentation. (Issue #103)
* Accept both styles of closing bracket indentation for hanging indent.
Do not report error E123 in the default configuration. (Issue #103)
Bug fixes:
* Do not crash when running AST checks and the document contains null bytes.
(Issue #184)
* Correctly report other E12 errors when E123 is ignored. (Issue #103)
* Fix false positive E261/E262 when the file contains a BOM. (Issue #193)
* Fix E701, E702 and E703 not detected sometimes. (Issue #196)
* Fix E122 not detected in some cases. (Issue #201 and #208)
* Fix false positive E121 with multiple brackets. (Issue #203)
1.4.5 (2013-03-06)
------------------
* When no path is specified, do not try to read from stdin. The feature
was added in 1.4.3, but it is not supported on Windows. Use ``-``
filename argument to read from stdin. This usage is supported
since 1.3.4. (Issue #170)
* Do not require ``setuptools`` in setup.py. It works around an issue
with ``pip`` and Python 3. (Issue #172)
* Add ``__pycache__`` to the ignore list.
* Change misleading message for E251. (Issue #171)
* Do not report false E302 when the source file has a coding cookie or a
comment on the first line. (Issue #174)
* Reorganize the tests and add tests for the API and for the command line
usage and options. (Issues #161 and #162)
* Ignore all checks which are not explicitly selected when ``select`` is
passed to the ``StyleGuide`` constructor.
1.4.4 (2013-02-24)
------------------
* Report E227 or E228 instead of E225 for whitespace around bitwise, shift
or modulo operators. (Issue #166)
* Change the message for E226 to make clear that it is about arithmetic
operators.
* Fix a false positive E128 for continuation line indentation with tabs.
* Fix regression with the ``--diff`` option. (Issue #169)
* Fix the ``TestReport`` class to print the unexpected warnings and
errors.
1.4.3 (2013-02-22)
------------------
* Hide the ``--doctest`` and ``--testsuite`` options when installed.
* Fix crash with AST checkers when the syntax is invalid. (Issue #160)
* Read from standard input if no path is specified.
* Initiate a graceful shutdown on ``Control+C``.
* Allow changing the ``checker_class`` for the ``StyleGuide``.
1.4.2 (2013-02-10)
------------------
* Support AST checkers provided by third-party applications.
* Register new checkers with ``register_check(func_or_cls, codes)``.
* Allow constructing a ``StyleGuide`` with a custom parser.
* Accept visual indentation without parenthesis after the ``if``
statement. (Issue #151)
* Fix UnboundLocalError when using ``# noqa`` with continued lines.
(Issue #158)
* Re-order the lines for the ``StandardReport``.
* Expand tabs when checking E12 continuation lines. (Issue #155)
* Refactor the testing class ``TestReport`` and the specific test
functions into a separate test module.
1.4.1 (2013-01-18)
------------------
* Allow sphinx.ext.autodoc syntax for comments. (Issue #110)
* Report E703 instead of E702 for the trailing semicolon. (Issue #117)
* Honor ``# noqa`` in addition to ``# nopep8``. (Issue #149)
* Expose the ``OptionParser`` factory for better extensibility.
1.4 (2012-12-22)
----------------
* Report E226 instead of E225 for optional whitespace around common
operators (``*``, ``**``, ``/``, ``+`` and ``-``). This new error
code is ignored in the default configuration because PEP 8 recommends
to "use your own judgement". (Issue #96)
* Lines with a ``# nopep8`` at the end will not issue errors on line
length E501 or continuation line indentation E12*. (Issue #27)
* Fix AssertionError when the source file contains an invalid line
ending ``"\r\r\n"``. (Issue #119)
* Read the ``[pep8]`` section of ``tox.ini`` or ``setup.cfg`` if present.
(Issue #93 and #141)
* Add the Sphinx-based documentation, and publish it
on https://pycodestyle.readthedocs.io/. (Issue #105)
1.3.4 (2012-12-18)
------------------
* Fix false positive E124 and E128 with comments. (Issue #100)
* Fix error on stdin when running with bpython. (Issue #101)
* Fix false positive E401. (Issue #104)
* Report E231 for nested dictionary in list. (Issue #142)
* Catch E271 at the beginning of the line. (Issue #133)
* Fix false positive E126 for multi-line comments. (Issue #138)
* Fix false positive E221 when operator is preceded by a comma. (Issue #135)
* Fix ``--diff`` failing on one-line hunk. (Issue #137)
* Fix the ``--exclude`` switch for directory paths. (Issue #111)
* Use ``-`` filename to read from standard input. (Issue #128)
1.3.3 (2012-06-27)
------------------
* Fix regression with continuation line checker. (Issue #98)
1.3.2 (2012-06-26)
------------------
* Revert to the previous behaviour for ``--show-pep8``:
do not imply ``--first``. (Issue #89)
* Add E902 for IO errors. (Issue #87)
* Fix false positive for E121, and missed E124. (Issue #92)
* Set a sensible default path for config file on Windows. (Issue #95)
* Allow ``verbose`` in the configuration file. (Issue #91)
* Show the enforced ``max-line-length`` in the error message. (Issue #86)
1.3.1 (2012-06-18)
------------------
* Explain which configuration options are expected. Accept and recommend
the options names with hyphen instead of underscore. (Issue #82)
* Do not read the user configuration when used as a module
(except if ``config_file=True`` is passed to the ``StyleGuide`` constructor).
* Fix wrong or missing cases for the E12 series.
* Fix cases where E122 was missed. (Issue #81)
1.3 (2012-06-15)
----------------
.. warning::
The internal API is backwards incompatible.
* Remove global configuration and refactor the library around
a ``StyleGuide`` class; add the ability to configure various
reporters. (Issue #35 and #66)
* Read user configuration from ``~/.config/pep8``
and local configuration from ``./.pep8``. (Issue #22)
* Fix E502 for backslash embedded in multi-line string. (Issue #68)
* Fix E225 for Python 3 iterable unpacking (PEP 3132). (Issue #72)
* Enable the new checkers from the E12 series in the default
configuration.
* Suggest less error-prone alternatives for E712 errors.
* Rewrite checkers to run faster (E22, E251, E27).
* Fixed a crash when parsed code is invalid (too many
closing brackets).
* Fix E127 and E128 for continuation line indentation. (Issue #74)
* New option ``--format`` to customize the error format. (Issue #23)
* New option ``--diff`` to check only modified code. The unified
diff is read from STDIN. Example: ``hg diff | pep8 --diff``
(Issue #39)
* Correctly report the count of failures and set the exit code to 1
when the ``--doctest`` or the ``--testsuite`` fails.
* Correctly detect the encoding in Python 3. (Issue #69)
* Drop support for Python 2.3, 2.4 and 3.0. (Issue #78)
1.2 (2012-06-01)
----------------
* Add E121 through E128 for continuation line indentation. These
checks are disabled by default. If you want to force all checks,
use switch ``--select=E,W``. Patch by Sam Vilain. (Issue #64)
* Add E721 for direct type comparisons. (Issue #47)
* Add E711 and E712 for comparisons to singletons. (Issue #46)
* Fix spurious E225 and E701 for function annotations. (Issue #29)
* Add E502 for explicit line join between brackets.
* Fix E901 when printing source with ``--show-source``.
* Report all errors for each checker, instead of reporting only the
first occurrence for each line.
* Option ``--show-pep8`` implies ``--first``.
1.1 (2012-05-24)
----------------
* Add E901 for syntax errors. (Issues #63 and #30)
* Add E271, E272, E273 and E274 for extraneous whitespace around
keywords. (Issue #57)
* Add ``tox.ini`` configuration file for tests. (Issue #61)
* Add ``.travis.yml`` configuration file for continuous integration.
(Issue #62)
1.0.1 (2012-04-06)
------------------
* Fix inconsistent version numbers.
1.0 (2012-04-04)
----------------
* Fix W602 ``raise`` to handle multi-char names. (Issue #53)
0.7.0 (2012-03-26)
------------------
* Now ``--first`` prints only the first occurrence of each error.
The ``--repeat`` flag becomes obsolete because it is the default
behaviour. (Issue #6)
* Allow specifying ``--max-line-length``. (Issue #36)
* Make the shebang more flexible. (Issue #26)
* Add testsuite to the bundle. (Issue #25)
* Fixes for Jython. (Issue #49)
* Add PyPI classifiers. (Issue #43)
* Fix the ``--exclude`` option. (Issue #48)
* Fix W602, accept ``raise`` with 3 arguments. (Issue #34)
* Correctly select all tests if ``DEFAULT_IGNORE == ''``.
0.6.1 (2010-10-03)
------------------
* Fix inconsistent version numbers. (Issue #21)
0.6.0 (2010-09-19)
------------------
* Test suite reorganized and enhanced in order to check more failures
with fewer test files. Read the ``run_tests`` docstring for details
about the syntax.
* Fix E225: accept ``print >>sys.stderr, "..."`` syntax.
* Fix E501 for lines containing multibyte encoded characters. (Issue #7)
* Fix E221, E222, E223, E224 not detected in some cases. (Issue #16)
* Fix E211 to reject ``v = dic['a'] ['b']``. (Issue #17)
* Exit code is always 1 if any error or warning is found. (Issue #10)
* ``--ignore`` checks are now really ignored, especially in
conjunction with ``--count``. (Issue #8)
* Blank lines with spaces yield W293 instead of W291: some developers
want to ignore this warning and indent the blank lines to paste their
code easily in the Python interpreter.
* Fix E301: do not require a blank line before an indented block. (Issue #14)
* Fix E203 to accept NumPy slice notation ``a[0, :]``. (Issue #13)
* Performance improvements.
* Fix decoding and checking non-UTF8 files in Python 3.
* Fix E225: reject ``True+False`` when running on Python 3.
* Fix an exception when the line starts with an operator.
* Allow a new line before closing ``)``, ``}`` or ``]``. (Issue #5)
0.5.0 (2010-02-17)
------------------
* Changed the ``--count`` switch to print to sys.stderr and set
exit code to 1 if any error or warning is found.
* E241 and E242 are removed from the standard checks. If you want to
include these checks, use switch ``--select=E,W``. (Issue #4)
* Blank line is not mandatory before the first class method or nested
function definition, even if there's a docstring. (Issue #1)
* Add the switch ``--version``.
* Fix decoding errors with Python 3. (Issue #13 [1]_)
* Add ``--select`` option which is mirror of ``--ignore``.
* Add checks E261 and E262 for spaces before inline comments.
* New check W604 warns about deprecated usage of backticks.
* New check W603 warns about the deprecated operator ``<>``.
* Performance improvement, due to rewriting of E225.
* E225 now accepts:
- no whitespace after unary operator or similar. (Issue #9 [1]_)
- lambda function with argument unpacking or keyword defaults.
* Reserve "2 blank lines" for module-level logical blocks. (E303)
* Allow multi-line comments. (E302, issue #10 [1]_)
0.4.2 (2009-10-22)
------------------
* Decorators on classes and class methods are OK now.
0.4 (2009-10-20)
----------------
* Support for all versions of Python from 2.3 to 3.1.
* New and greatly expanded self tests.
* Added ``--count`` option to print the total number of errors and warnings.
* Further improvements to the handling of comments and blank lines.
(Issue #1 [1]_ and others changes.)
* Check all py files in directory when passed a directory (Issue
#2 [1]_). This also prevents an exception when traversing directories
with non ``*.py`` files.
* E231 should allow commas to be followed by ``)``. (Issue #3 [1]_)
* Spaces are no longer required around the equals sign for keyword
arguments or default parameter values.
.. [1] These issues refer to the `previous issue tracker`__.
.. __: http://github.com/cburroughs/pep8.py/issues
0.3.1 (2009-09-14)
------------------
* Fixes for comments: do not count them when checking for blank lines between
items.
* Added setup.py for pypi upload and easy_installability.
0.2 (2007-10-16)
----------------
* Loads of fixes and improvements.
0.1 (2006-10-01)
----------------
* First release.
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/MarkupSafe-1.1.1.dist-info/RECORD
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MarkupSafe-1.1.1.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4
MarkupSafe-1.1.1.dist-info/LICENSE.rst,sha256=RjHsDbX9kKVH4zaBcmTGeYIUM4FG-KyUtKV_lu6MnsQ,1503
MarkupSafe-1.1.1.dist-info/METADATA,sha256=-XXnVvCxQP2QbHutIQq_7Pk9OATy-x0NC7gN_3_SCRE,3167
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markupsafe/__init__.py,sha256=UAy1UKlykemnSZWIVn8RDqY0wvjV6lkeRwYOMNhw4bA,10453
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/MarkupSafe-1.1.1.dist-info/WHEEL
|
Wheel-Version: 1.0
Generator: bdist_wheel (0.36.2)
Root-Is-Purelib: false
Tag: cp39-cp39-win_amd64
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/MarkupSafe-1.1.1.dist-info/LICENSE.rst
|
Copyright 2010 Pallets
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/MarkupSafe-1.1.1.dist-info/top_level.txt
|
markupsafe
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/MarkupSafe-1.1.1.dist-info/INSTALLER
|
pip
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/MarkupSafe-1.1.1.dist-info/METADATA
|
Metadata-Version: 2.1
Name: MarkupSafe
Version: 1.1.1
Summary: Safely add untrusted strings to HTML/XML markup.
Home-page: https://palletsprojects.com/p/markupsafe/
Author: Armin Ronacher
Author-email: armin.ronacher@active-4.com
Maintainer: The Pallets Team
Maintainer-email: contact@palletsprojects.com
License: BSD-3-Clause
Project-URL: Documentation, https://markupsafe.palletsprojects.com/
Project-URL: Code, https://github.com/pallets/markupsafe
Project-URL: Issue tracker, https://github.com/pallets/markupsafe/issues
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Web Environment
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Text Processing :: Markup :: HTML
Requires-Python: >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*
Description-Content-Type: text/x-rst
MarkupSafe
==========
MarkupSafe implements a text object that escapes characters so it is
safe to use in HTML and XML. Characters that have special meanings are
replaced so that they display as the actual characters. This mitigates
injection attacks, meaning untrusted user input can safely be displayed
on a page.
Installing
----------
Install and update using `pip`_:
.. code-block:: text
pip install -U MarkupSafe
.. _pip: https://pip.pypa.io/en/stable/quickstart/
Examples
--------
.. code-block:: pycon
>>> from markupsafe import Markup, escape
>>> # escape replaces special characters and wraps in Markup
>>> escape('<script>alert(document.cookie);</script>')
Markup(u'<script>alert(document.cookie);</script>')
>>> # wrap in Markup to mark text "safe" and prevent escaping
>>> Markup('<strong>Hello</strong>')
Markup('<strong>hello</strong>')
>>> escape(Markup('<strong>Hello</strong>'))
Markup('<strong>hello</strong>')
>>> # Markup is a text subclass (str on Python 3, unicode on Python 2)
>>> # methods and operators escape their arguments
>>> template = Markup("Hello <em>%s</em>")
>>> template % '"World"'
Markup('Hello <em>"World"</em>')
Donate
------
The Pallets organization develops and supports MarkupSafe and other
libraries that use it. In order to grow the community of contributors
and users, and allow the maintainers to devote more time to the
projects, `please donate today`_.
.. _please donate today: https://palletsprojects.com/donate
Links
-----
* Website: https://palletsprojects.com/p/markupsafe/
* Documentation: https://markupsafe.palletsprojects.com/
* Releases: https://pypi.org/project/MarkupSafe/
* Code: https://github.com/pallets/markupsafe
* Issue tracker: https://github.com/pallets/markupsafe/issues
* Test status: https://dev.azure.com/pallets/markupsafe/_build
* Official chat: https://discord.gg/t6rrQZH
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qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/_reloader.py
|
import os
import subprocess
import sys
import threading
import time
from itertools import chain
from ._compat import iteritems
from ._compat import PY2
from ._compat import text_type
from ._internal import _log
def _iter_module_files():
"""This iterates over all relevant Python files. It goes through all
loaded files from modules, all files in folders of already loaded modules
as well as all files reachable through a package.
"""
# The list call is necessary on Python 3 in case the module
# dictionary modifies during iteration.
for module in list(sys.modules.values()):
if module is None:
continue
filename = getattr(module, "__file__", None)
if filename:
if os.path.isdir(filename) and os.path.exists(
os.path.join(filename, "__init__.py")
):
filename = os.path.join(filename, "__init__.py")
old = None
while not os.path.isfile(filename):
old = filename
filename = os.path.dirname(filename)
if filename == old:
break
else:
if filename[-4:] in (".pyc", ".pyo"):
filename = filename[:-1]
yield filename
def _find_observable_paths(extra_files=None):
"""Finds all paths that should be observed."""
rv = set(
os.path.dirname(os.path.abspath(x)) if os.path.isfile(x) else os.path.abspath(x)
for x in sys.path
)
for filename in extra_files or ():
rv.add(os.path.dirname(os.path.abspath(filename)))
for module in list(sys.modules.values()):
fn = getattr(module, "__file__", None)
if fn is None:
continue
fn = os.path.abspath(fn)
rv.add(os.path.dirname(fn))
return _find_common_roots(rv)
def _get_args_for_reloading():
"""Determine how the script was executed, and return the args needed
to execute it again in a new process.
"""
rv = [sys.executable]
py_script = sys.argv[0]
args = sys.argv[1:]
# Need to look at main module to determine how it was executed.
__main__ = sys.modules["__main__"]
# The value of __package__ indicates how Python was called. It may
# not exist if a setuptools script is installed as an egg. It may be
# set incorrectly for entry points created with pip on Windows.
if getattr(__main__, "__package__", None) is None or (
os.name == "nt"
and __main__.__package__ == ""
and not os.path.exists(py_script)
and os.path.exists(py_script + ".exe")
):
# Executed a file, like "python app.py".
py_script = os.path.abspath(py_script)
if os.name == "nt":
# Windows entry points have ".exe" extension and should be
# called directly.
if not os.path.exists(py_script) and os.path.exists(py_script + ".exe"):
py_script += ".exe"
if (
os.path.splitext(sys.executable)[1] == ".exe"
and os.path.splitext(py_script)[1] == ".exe"
):
rv.pop(0)
rv.append(py_script)
else:
# Executed a module, like "python -m werkzeug.serving".
if sys.argv[0] == "-m":
# Flask works around previous behavior by putting
# "-m flask" in sys.argv.
# TODO remove this once Flask no longer misbehaves
args = sys.argv
else:
if os.path.isfile(py_script):
# Rewritten by Python from "-m script" to "/path/to/script.py".
py_module = __main__.__package__
name = os.path.splitext(os.path.basename(py_script))[0]
if name != "__main__":
py_module += "." + name
else:
# Incorrectly rewritten by pydevd debugger from "-m script" to "script".
py_module = py_script
rv.extend(("-m", py_module.lstrip(".")))
rv.extend(args)
return rv
def _find_common_roots(paths):
"""Out of some paths it finds the common roots that need monitoring."""
paths = [x.split(os.path.sep) for x in paths]
root = {}
for chunks in sorted(paths, key=len, reverse=True):
node = root
for chunk in chunks:
node = node.setdefault(chunk, {})
node.clear()
rv = set()
def _walk(node, path):
for prefix, child in iteritems(node):
_walk(child, path + (prefix,))
if not node:
rv.add("/".join(path))
_walk(root, ())
return rv
class ReloaderLoop(object):
name = None
# monkeypatched by testsuite. wrapping with `staticmethod` is required in
# case time.sleep has been replaced by a non-c function (e.g. by
# `eventlet.monkey_patch`) before we get here
_sleep = staticmethod(time.sleep)
def __init__(self, extra_files=None, interval=1):
self.extra_files = set(os.path.abspath(x) for x in extra_files or ())
self.interval = interval
def run(self):
pass
def restart_with_reloader(self):
"""Spawn a new Python interpreter with the same arguments as this one,
but running the reloader thread.
"""
while 1:
_log("info", " * Restarting with %s" % self.name)
args = _get_args_for_reloading()
# a weird bug on windows. sometimes unicode strings end up in the
# environment and subprocess.call does not like this, encode them
# to latin1 and continue.
if os.name == "nt" and PY2:
new_environ = {}
for key, value in iteritems(os.environ):
if isinstance(key, text_type):
key = key.encode("iso-8859-1")
if isinstance(value, text_type):
value = value.encode("iso-8859-1")
new_environ[key] = value
else:
new_environ = os.environ.copy()
new_environ["WERKZEUG_RUN_MAIN"] = "true"
exit_code = subprocess.call(args, env=new_environ, close_fds=False)
if exit_code != 3:
return exit_code
def trigger_reload(self, filename):
self.log_reload(filename)
sys.exit(3)
def log_reload(self, filename):
filename = os.path.abspath(filename)
_log("info", " * Detected change in %r, reloading" % filename)
class StatReloaderLoop(ReloaderLoop):
name = "stat"
def run(self):
mtimes = {}
while 1:
for filename in chain(_iter_module_files(), self.extra_files):
try:
mtime = os.stat(filename).st_mtime
except OSError:
continue
old_time = mtimes.get(filename)
if old_time is None:
mtimes[filename] = mtime
continue
elif mtime > old_time:
self.trigger_reload(filename)
self._sleep(self.interval)
class WatchdogReloaderLoop(ReloaderLoop):
def __init__(self, *args, **kwargs):
ReloaderLoop.__init__(self, *args, **kwargs)
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
self.observable_paths = set()
def _check_modification(filename):
if filename in self.extra_files:
self.trigger_reload(filename)
dirname = os.path.dirname(filename)
if dirname.startswith(tuple(self.observable_paths)):
if filename.endswith((".pyc", ".pyo", ".py")):
self.trigger_reload(filename)
class _CustomHandler(FileSystemEventHandler):
def on_created(self, event):
_check_modification(event.src_path)
def on_modified(self, event):
_check_modification(event.src_path)
def on_moved(self, event):
_check_modification(event.src_path)
_check_modification(event.dest_path)
def on_deleted(self, event):
_check_modification(event.src_path)
reloader_name = Observer.__name__.lower()
if reloader_name.endswith("observer"):
reloader_name = reloader_name[:-8]
reloader_name += " reloader"
self.name = reloader_name
self.observer_class = Observer
self.event_handler = _CustomHandler()
self.should_reload = False
def trigger_reload(self, filename):
# This is called inside an event handler, which means throwing
# SystemExit has no effect.
# https://github.com/gorakhargosh/watchdog/issues/294
self.should_reload = True
self.log_reload(filename)
def run(self):
watches = {}
observer = self.observer_class()
observer.start()
try:
while not self.should_reload:
to_delete = set(watches)
paths = _find_observable_paths(self.extra_files)
for path in paths:
if path not in watches:
try:
watches[path] = observer.schedule(
self.event_handler, path, recursive=True
)
except OSError:
# Clear this path from list of watches We don't want
# the same error message showing again in the next
# iteration.
watches[path] = None
to_delete.discard(path)
for path in to_delete:
watch = watches.pop(path, None)
if watch is not None:
observer.unschedule(watch)
self.observable_paths = paths
self._sleep(self.interval)
finally:
observer.stop()
observer.join()
sys.exit(3)
reloader_loops = {"stat": StatReloaderLoop, "watchdog": WatchdogReloaderLoop}
try:
__import__("watchdog.observers")
except ImportError:
reloader_loops["auto"] = reloader_loops["stat"]
else:
reloader_loops["auto"] = reloader_loops["watchdog"]
def ensure_echo_on():
"""Ensure that echo mode is enabled. Some tools such as PDB disable
it which causes usability issues after reload."""
# tcgetattr will fail if stdin isn't a tty
if not sys.stdin.isatty():
return
try:
import termios
except ImportError:
return
attributes = termios.tcgetattr(sys.stdin)
if not attributes[3] & termios.ECHO:
attributes[3] |= termios.ECHO
termios.tcsetattr(sys.stdin, termios.TCSANOW, attributes)
def run_with_reloader(main_func, extra_files=None, interval=1, reloader_type="auto"):
"""Run the given function in an independent python interpreter."""
import signal
reloader = reloader_loops[reloader_type](extra_files, interval)
signal.signal(signal.SIGTERM, lambda *args: sys.exit(0))
try:
if os.environ.get("WERKZEUG_RUN_MAIN") == "true":
ensure_echo_on()
t = threading.Thread(target=main_func, args=())
t.setDaemon(True)
t.start()
reloader.run()
else:
sys.exit(reloader.restart_with_reloader())
except KeyboardInterrupt:
pass
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/_internal.py
|
# -*- coding: utf-8 -*-
"""
werkzeug._internal
~~~~~~~~~~~~~~~~~~
This module provides internally used helpers and constants.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import inspect
import logging
import re
import string
from datetime import date
from datetime import datetime
from itertools import chain
from weakref import WeakKeyDictionary
from ._compat import int_to_byte
from ._compat import integer_types
from ._compat import iter_bytes
from ._compat import range_type
from ._compat import text_type
_logger = None
_signature_cache = WeakKeyDictionary()
_epoch_ord = date(1970, 1, 1).toordinal()
_legal_cookie_chars = (
string.ascii_letters + string.digits + u"/=!#$%&'*+-.^_`|~:"
).encode("ascii")
_cookie_quoting_map = {b",": b"\\054", b";": b"\\073", b'"': b'\\"', b"\\": b"\\\\"}
for _i in chain(range_type(32), range_type(127, 256)):
_cookie_quoting_map[int_to_byte(_i)] = ("\\%03o" % _i).encode("latin1")
_octal_re = re.compile(br"\\[0-3][0-7][0-7]")
_quote_re = re.compile(br"[\\].")
_legal_cookie_chars_re = br"[\w\d!#%&\'~_`><@,:/\$\*\+\-\.\^\|\)\(\?\}\{\=]"
_cookie_re = re.compile(
br"""
(?P<key>[^=;]+)
(?:\s*=\s*
(?P<val>
"(?:[^\\"]|\\.)*" |
(?:.*?)
)
)?
\s*;
""",
flags=re.VERBOSE,
)
class _Missing(object):
def __repr__(self):
return "no value"
def __reduce__(self):
return "_missing"
_missing = _Missing()
def _get_environ(obj):
env = getattr(obj, "environ", obj)
assert isinstance(env, dict), (
"%r is not a WSGI environment (has to be a dict)" % type(obj).__name__
)
return env
def _has_level_handler(logger):
"""Check if there is a handler in the logging chain that will handle
the given logger's effective level.
"""
level = logger.getEffectiveLevel()
current = logger
while current:
if any(handler.level <= level for handler in current.handlers):
return True
if not current.propagate:
break
current = current.parent
return False
def _log(type, message, *args, **kwargs):
"""Log a message to the 'werkzeug' logger.
The logger is created the first time it is needed. If there is no
level set, it is set to :data:`logging.INFO`. If there is no handler
for the logger's effective level, a :class:`logging.StreamHandler`
is added.
"""
global _logger
if _logger is None:
_logger = logging.getLogger("werkzeug")
if _logger.level == logging.NOTSET:
_logger.setLevel(logging.INFO)
if not _has_level_handler(_logger):
_logger.addHandler(logging.StreamHandler())
getattr(_logger, type)(message.rstrip(), *args, **kwargs)
def _parse_signature(func):
"""Return a signature object for the function."""
if hasattr(func, "im_func"):
func = func.im_func
# if we have a cached validator for this function, return it
parse = _signature_cache.get(func)
if parse is not None:
return parse
# inspect the function signature and collect all the information
if hasattr(inspect, "getfullargspec"):
tup = inspect.getfullargspec(func)
else:
tup = inspect.getargspec(func)
positional, vararg_var, kwarg_var, defaults = tup[:4]
defaults = defaults or ()
arg_count = len(positional)
arguments = []
for idx, name in enumerate(positional):
if isinstance(name, list):
raise TypeError(
"cannot parse functions that unpack tuples in the function signature"
)
try:
default = defaults[idx - arg_count]
except IndexError:
param = (name, False, None)
else:
param = (name, True, default)
arguments.append(param)
arguments = tuple(arguments)
def parse(args, kwargs):
new_args = []
missing = []
extra = {}
# consume as many arguments as positional as possible
for idx, (name, has_default, default) in enumerate(arguments):
try:
new_args.append(args[idx])
except IndexError:
try:
new_args.append(kwargs.pop(name))
except KeyError:
if has_default:
new_args.append(default)
else:
missing.append(name)
else:
if name in kwargs:
extra[name] = kwargs.pop(name)
# handle extra arguments
extra_positional = args[arg_count:]
if vararg_var is not None:
new_args.extend(extra_positional)
extra_positional = ()
if kwargs and kwarg_var is None:
extra.update(kwargs)
kwargs = {}
return (
new_args,
kwargs,
missing,
extra,
extra_positional,
arguments,
vararg_var,
kwarg_var,
)
_signature_cache[func] = parse
return parse
def _date_to_unix(arg):
"""Converts a timetuple, integer or datetime object into the seconds from
epoch in utc.
"""
if isinstance(arg, datetime):
arg = arg.utctimetuple()
elif isinstance(arg, integer_types + (float,)):
return int(arg)
year, month, day, hour, minute, second = arg[:6]
days = date(year, month, 1).toordinal() - _epoch_ord + day - 1
hours = days * 24 + hour
minutes = hours * 60 + minute
seconds = minutes * 60 + second
return seconds
class _DictAccessorProperty(object):
"""Baseclass for `environ_property` and `header_property`."""
read_only = False
def __init__(
self,
name,
default=None,
load_func=None,
dump_func=None,
read_only=None,
doc=None,
):
self.name = name
self.default = default
self.load_func = load_func
self.dump_func = dump_func
if read_only is not None:
self.read_only = read_only
self.__doc__ = doc
def __get__(self, obj, type=None):
if obj is None:
return self
storage = self.lookup(obj)
if self.name not in storage:
return self.default
rv = storage[self.name]
if self.load_func is not None:
try:
rv = self.load_func(rv)
except (ValueError, TypeError):
rv = self.default
return rv
def __set__(self, obj, value):
if self.read_only:
raise AttributeError("read only property")
if self.dump_func is not None:
value = self.dump_func(value)
self.lookup(obj)[self.name] = value
def __delete__(self, obj):
if self.read_only:
raise AttributeError("read only property")
self.lookup(obj).pop(self.name, None)
def __repr__(self):
return "<%s %s>" % (self.__class__.__name__, self.name)
def _cookie_quote(b):
buf = bytearray()
all_legal = True
_lookup = _cookie_quoting_map.get
_push = buf.extend
for char in iter_bytes(b):
if char not in _legal_cookie_chars:
all_legal = False
char = _lookup(char, char)
_push(char)
if all_legal:
return bytes(buf)
return bytes(b'"' + buf + b'"')
def _cookie_unquote(b):
if len(b) < 2:
return b
if b[:1] != b'"' or b[-1:] != b'"':
return b
b = b[1:-1]
i = 0
n = len(b)
rv = bytearray()
_push = rv.extend
while 0 <= i < n:
o_match = _octal_re.search(b, i)
q_match = _quote_re.search(b, i)
if not o_match and not q_match:
rv.extend(b[i:])
break
j = k = -1
if o_match:
j = o_match.start(0)
if q_match:
k = q_match.start(0)
if q_match and (not o_match or k < j):
_push(b[i:k])
_push(b[k + 1 : k + 2])
i = k + 2
else:
_push(b[i:j])
rv.append(int(b[j + 1 : j + 4], 8))
i = j + 4
return bytes(rv)
def _cookie_parse_impl(b):
"""Lowlevel cookie parsing facility that operates on bytes."""
i = 0
n = len(b)
while i < n:
match = _cookie_re.search(b + b";", i)
if not match:
break
key = match.group("key").strip()
value = match.group("val") or b""
i = match.end(0)
yield _cookie_unquote(key), _cookie_unquote(value)
def _encode_idna(domain):
# If we're given bytes, make sure they fit into ASCII
if not isinstance(domain, text_type):
domain.decode("ascii")
return domain
# Otherwise check if it's already ascii, then return
try:
return domain.encode("ascii")
except UnicodeError:
pass
# Otherwise encode each part separately
parts = domain.split(".")
for idx, part in enumerate(parts):
parts[idx] = part.encode("idna")
return b".".join(parts)
def _decode_idna(domain):
# If the input is a string try to encode it to ascii to
# do the idna decoding. if that fails because of an
# unicode error, then we already have a decoded idna domain
if isinstance(domain, text_type):
try:
domain = domain.encode("ascii")
except UnicodeError:
return domain
# Decode each part separately. If a part fails, try to
# decode it with ascii and silently ignore errors. This makes
# most sense because the idna codec does not have error handling
parts = domain.split(b".")
for idx, part in enumerate(parts):
try:
parts[idx] = part.decode("idna")
except UnicodeError:
parts[idx] = part.decode("ascii", "ignore")
return ".".join(parts)
def _make_cookie_domain(domain):
if domain is None:
return None
domain = _encode_idna(domain)
if b":" in domain:
domain = domain.split(b":", 1)[0]
if b"." in domain:
return domain
raise ValueError(
"Setting 'domain' for a cookie on a server running locally (ex: "
"localhost) is not supported by complying browsers. You should "
"have something like: '127.0.0.1 localhost dev.localhost' on "
"your hosts file and then point your server to run on "
"'dev.localhost' and also set 'domain' for 'dev.localhost'"
)
def _easteregg(app=None):
"""Like the name says. But who knows how it works?"""
def bzzzzzzz(gyver):
import base64
import zlib
return zlib.decompress(base64.b64decode(gyver)).decode("ascii")
gyver = u"\n".join(
[
x + (77 - len(x)) * u" "
for x in bzzzzzzz(
b"""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8MID55vqr/g64Qr/wqwlE0TVxgoiZhHrbY2h1iuuyUVg1nlkpDrQ7Vm1xIkI5XRKLedN9EjzVchu
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Xyq3RE5lW00EJjaqwp/v3EByMSpVZYsEIJ4APaHmVtpGSieV5CALOtNUAzTBiw81GLgC0quyzf6c
NlWknzJeCsJ5fup2R4d8CYGN77mu5vnO1UqbfElZ9E6cR6zbHjgsr9ly18fXjZoPeDjPuzlWbFwS
pdvPkhntFvkc13qb9094LL5NrA3NIq3r9eNnop9DizWOqCEbyRBFJTHn6Tt3CG1o8a4HevYh0XiJ
sR0AVVHuGuMOIfbuQ/OKBkGRC6NJ4u7sbPX8bG/n5sNIOQ6/Y/BX3IwRlTSabtZpYLB85lYtkkgm
p1qXK3Du2mnr5INXmT/78KI12n11EFBkJHHp0wJyLe9MvPNUGYsf+170maayRoy2lURGHAIapSpQ
krEDuNoJCHNlZYhKpvw4mspVWxqo415n8cD62N9+EfHrAvqQnINStetek7RY2Urv8nxsnGaZfRr/
nhXbJ6m/yl1LzYqscDZA9QHLNbdaSTTr+kFg3bC0iYbX/eQy0Bv3h4B50/SGYzKAXkCeOLI3bcAt
mj2Z/FM1vQWgDynsRwNvrWnJHlespkrp8+vO1jNaibm+PhqXPPv30YwDZ6jApe3wUjFQobghvW9p
7f2zLkGNv8b191cD/3vs9Q833z8t"""
).splitlines()
]
)
def easteregged(environ, start_response):
def injecting_start_response(status, headers, exc_info=None):
headers.append(("X-Powered-By", "Werkzeug"))
return start_response(status, headers, exc_info)
if app is not None and environ.get("QUERY_STRING") != "macgybarchakku":
return app(environ, injecting_start_response)
injecting_start_response("200 OK", [("Content-Type", "text/html")])
return [
(
u"""
<!DOCTYPE html>
<html>
<head>
<title>About Werkzeug</title>
<style type="text/css">
body { font: 15px Georgia, serif; text-align: center; }
a { color: #333; text-decoration: none; }
h1 { font-size: 30px; margin: 20px 0 10px 0; }
p { margin: 0 0 30px 0; }
pre { font: 11px 'Consolas', 'Monaco', monospace; line-height: 0.95; }
</style>
</head>
<body>
<h1><a href="http://werkzeug.pocoo.org/">Werkzeug</a></h1>
<p>the Swiss Army knife of Python web development.</p>
<pre>%s\n\n\n</pre>
</body>
</html>"""
% gyver
).encode("latin1")
]
return easteregged
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/serving.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.serving
~~~~~~~~~~~~~~~~
There are many ways to serve a WSGI application. While you're developing
it you usually don't want a full blown webserver like Apache but a simple
standalone one. From Python 2.5 onwards there is the `wsgiref`_ server in
the standard library. If you're using older versions of Python you can
download the package from the cheeseshop.
However there are some caveats. Sourcecode won't reload itself when
changed and each time you kill the server using ``^C`` you get an
`KeyboardInterrupt` error. While the latter is easy to solve the first
one can be a pain in the ass in some situations.
The easiest way is creating a small ``start-myproject.py`` that runs the
application::
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from myproject import make_app
from werkzeug.serving import run_simple
app = make_app(...)
run_simple('localhost', 8080, app, use_reloader=True)
You can also pass it a `extra_files` keyword argument with a list of
additional files (like configuration files) you want to observe.
For bigger applications you should consider using `click`
(http://click.pocoo.org) instead of a simple start file.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import io
import os
import signal
import socket
import sys
from datetime import datetime as dt
from datetime import timedelta
from ._compat import PY2
from ._compat import reraise
from ._compat import WIN
from ._compat import wsgi_encoding_dance
from ._internal import _log
from .exceptions import InternalServerError
from .urls import uri_to_iri
from .urls import url_parse
from .urls import url_unquote
try:
import socketserver
from http.server import BaseHTTPRequestHandler
from http.server import HTTPServer
except ImportError:
import SocketServer as socketserver
from BaseHTTPServer import HTTPServer
from BaseHTTPServer import BaseHTTPRequestHandler
try:
import ssl
except ImportError:
class _SslDummy(object):
def __getattr__(self, name):
raise RuntimeError("SSL support unavailable")
ssl = _SslDummy()
try:
import click
except ImportError:
click = None
ThreadingMixIn = socketserver.ThreadingMixIn
can_fork = hasattr(os, "fork")
if can_fork:
ForkingMixIn = socketserver.ForkingMixIn
else:
class ForkingMixIn(object):
pass
try:
af_unix = socket.AF_UNIX
except AttributeError:
af_unix = None
LISTEN_QUEUE = 128
can_open_by_fd = not WIN and hasattr(socket, "fromfd")
# On Python 3, ConnectionError represents the same errnos as
# socket.error from Python 2, while socket.error is an alias for the
# more generic OSError.
if PY2:
_ConnectionError = socket.error
else:
_ConnectionError = ConnectionError
class DechunkedInput(io.RawIOBase):
"""An input stream that handles Transfer-Encoding 'chunked'"""
def __init__(self, rfile):
self._rfile = rfile
self._done = False
self._len = 0
def readable(self):
return True
def read_chunk_len(self):
try:
line = self._rfile.readline().decode("latin1")
_len = int(line.strip(), 16)
except ValueError:
raise IOError("Invalid chunk header")
if _len < 0:
raise IOError("Negative chunk length not allowed")
return _len
def readinto(self, buf):
read = 0
while not self._done and read < len(buf):
if self._len == 0:
# This is the first chunk or we fully consumed the previous
# one. Read the next length of the next chunk
self._len = self.read_chunk_len()
if self._len == 0:
# Found the final chunk of size 0. The stream is now exhausted,
# but there is still a final newline that should be consumed
self._done = True
if self._len > 0:
# There is data (left) in this chunk, so append it to the
# buffer. If this operation fully consumes the chunk, this will
# reset self._len to 0.
n = min(len(buf), self._len)
buf[read : read + n] = self._rfile.read(n)
self._len -= n
read += n
if self._len == 0:
# Skip the terminating newline of a chunk that has been fully
# consumed. This also applies to the 0-sized final chunk
terminator = self._rfile.readline()
if terminator not in (b"\n", b"\r\n", b"\r"):
raise IOError("Missing chunk terminating newline")
return read
class WSGIRequestHandler(BaseHTTPRequestHandler, object):
"""A request handler that implements WSGI dispatching."""
@property
def server_version(self):
from . import __version__
return "Werkzeug/" + __version__
def make_environ(self):
request_url = url_parse(self.path)
def shutdown_server():
self.server.shutdown_signal = True
url_scheme = "http" if self.server.ssl_context is None else "https"
if not self.client_address:
self.client_address = "<local>"
if isinstance(self.client_address, str):
self.client_address = (self.client_address, 0)
else:
pass
# If there was no scheme but the path started with two slashes,
# the first segment may have been incorrectly parsed as the
# netloc, prepend it to the path again.
if not request_url.scheme and request_url.netloc:
path_info = "/%s%s" % (request_url.netloc, request_url.path)
else:
path_info = request_url.path
path_info = url_unquote(path_info)
environ = {
"wsgi.version": (1, 0),
"wsgi.url_scheme": url_scheme,
"wsgi.input": self.rfile,
"wsgi.errors": sys.stderr,
"wsgi.multithread": self.server.multithread,
"wsgi.multiprocess": self.server.multiprocess,
"wsgi.run_once": False,
"werkzeug.server.shutdown": shutdown_server,
"SERVER_SOFTWARE": self.server_version,
"REQUEST_METHOD": self.command,
"SCRIPT_NAME": "",
"PATH_INFO": wsgi_encoding_dance(path_info),
"QUERY_STRING": wsgi_encoding_dance(request_url.query),
# Non-standard, added by mod_wsgi, uWSGI
"REQUEST_URI": wsgi_encoding_dance(self.path),
# Non-standard, added by gunicorn
"RAW_URI": wsgi_encoding_dance(self.path),
"REMOTE_ADDR": self.address_string(),
"REMOTE_PORT": self.port_integer(),
"SERVER_NAME": self.server.server_address[0],
"SERVER_PORT": str(self.server.server_address[1]),
"SERVER_PROTOCOL": self.request_version,
}
for key, value in self.get_header_items():
key = key.upper().replace("-", "_")
value = value.replace("\r\n", "")
if key not in ("CONTENT_TYPE", "CONTENT_LENGTH"):
key = "HTTP_" + key
if key in environ:
value = "{},{}".format(environ[key], value)
environ[key] = value
if environ.get("HTTP_TRANSFER_ENCODING", "").strip().lower() == "chunked":
environ["wsgi.input_terminated"] = True
environ["wsgi.input"] = DechunkedInput(environ["wsgi.input"])
# Per RFC 2616, if the URL is absolute, use that as the host.
# We're using "has a scheme" to indicate an absolute URL.
if request_url.scheme and request_url.netloc:
environ["HTTP_HOST"] = request_url.netloc
try:
# binary_form=False gives nicer information, but wouldn't be compatible with
# what Nginx or Apache could return.
peer_cert = self.connection.getpeercert(binary_form=True)
if peer_cert is not None:
# Nginx and Apache use PEM format.
environ["SSL_CLIENT_CERT"] = ssl.DER_cert_to_PEM_cert(peer_cert)
except ValueError:
# SSL handshake hasn't finished.
self.server.log("error", "Cannot fetch SSL peer certificate info")
except AttributeError:
# Not using TLS, the socket will not have getpeercert().
pass
return environ
def run_wsgi(self):
if self.headers.get("Expect", "").lower().strip() == "100-continue":
self.wfile.write(b"HTTP/1.1 100 Continue\r\n\r\n")
self.environ = environ = self.make_environ()
headers_set = []
headers_sent = []
def write(data):
assert headers_set, "write() before start_response"
if not headers_sent:
status, response_headers = headers_sent[:] = headers_set
try:
code, msg = status.split(None, 1)
except ValueError:
code, msg = status, ""
code = int(code)
self.send_response(code, msg)
header_keys = set()
for key, value in response_headers:
self.send_header(key, value)
key = key.lower()
header_keys.add(key)
if not (
"content-length" in header_keys
or environ["REQUEST_METHOD"] == "HEAD"
or code < 200
or code in (204, 304)
):
self.close_connection = True
self.send_header("Connection", "close")
if "server" not in header_keys:
self.send_header("Server", self.version_string())
if "date" not in header_keys:
self.send_header("Date", self.date_time_string())
self.end_headers()
assert isinstance(data, bytes), "applications must write bytes"
if data:
# Only write data if there is any to avoid Python 3.5 SSL bug
self.wfile.write(data)
self.wfile.flush()
def start_response(status, response_headers, exc_info=None):
if exc_info:
try:
if headers_sent:
reraise(*exc_info)
finally:
exc_info = None
elif headers_set:
raise AssertionError("Headers already set")
headers_set[:] = [status, response_headers]
return write
def execute(app):
application_iter = app(environ, start_response)
try:
for data in application_iter:
write(data)
if not headers_sent:
write(b"")
finally:
if hasattr(application_iter, "close"):
application_iter.close()
try:
execute(self.server.app)
except (_ConnectionError, socket.timeout) as e:
self.connection_dropped(e, environ)
except Exception:
if self.server.passthrough_errors:
raise
from .debug.tbtools import get_current_traceback
traceback = get_current_traceback(ignore_system_exceptions=True)
try:
# if we haven't yet sent the headers but they are set
# we roll back to be able to set them again.
if not headers_sent:
del headers_set[:]
execute(InternalServerError())
except Exception:
pass
self.server.log("error", "Error on request:\n%s", traceback.plaintext)
def handle(self):
"""Handles a request ignoring dropped connections."""
try:
BaseHTTPRequestHandler.handle(self)
except (_ConnectionError, socket.timeout) as e:
self.connection_dropped(e)
except Exception as e:
if self.server.ssl_context is None or not is_ssl_error(e):
raise
if self.server.shutdown_signal:
self.initiate_shutdown()
def initiate_shutdown(self):
"""A horrible, horrible way to kill the server for Python 2.6 and
later. It's the best we can do.
"""
# Windows does not provide SIGKILL, go with SIGTERM then.
sig = getattr(signal, "SIGKILL", signal.SIGTERM)
# reloader active
if is_running_from_reloader():
os.kill(os.getpid(), sig)
# python 2.7
self.server._BaseServer__shutdown_request = True
# python 2.6
self.server._BaseServer__serving = False
def connection_dropped(self, error, environ=None):
"""Called if the connection was closed by the client. By default
nothing happens.
"""
def handle_one_request(self):
"""Handle a single HTTP request."""
self.raw_requestline = self.rfile.readline()
if not self.raw_requestline:
self.close_connection = 1
elif self.parse_request():
return self.run_wsgi()
def send_response(self, code, message=None):
"""Send the response header and log the response code."""
self.log_request(code)
if message is None:
message = code in self.responses and self.responses[code][0] or ""
if self.request_version != "HTTP/0.9":
hdr = "%s %d %s\r\n" % (self.protocol_version, code, message)
self.wfile.write(hdr.encode("ascii"))
def version_string(self):
return BaseHTTPRequestHandler.version_string(self).strip()
def address_string(self):
if getattr(self, "environ", None):
return self.environ["REMOTE_ADDR"]
elif not self.client_address:
return "<local>"
elif isinstance(self.client_address, str):
return self.client_address
else:
return self.client_address[0]
def port_integer(self):
return self.client_address[1]
def log_request(self, code="-", size="-"):
try:
path = uri_to_iri(self.path)
msg = "%s %s %s" % (self.command, path, self.request_version)
except AttributeError:
# path isn't set if the requestline was bad
msg = self.requestline
code = str(code)
if click:
color = click.style
if code[0] == "1": # 1xx - Informational
msg = color(msg, bold=True)
elif code[0] == "2": # 2xx - Success
msg = color(msg, fg="white")
elif code == "304": # 304 - Resource Not Modified
msg = color(msg, fg="cyan")
elif code[0] == "3": # 3xx - Redirection
msg = color(msg, fg="green")
elif code == "404": # 404 - Resource Not Found
msg = color(msg, fg="yellow")
elif code[0] == "4": # 4xx - Client Error
msg = color(msg, fg="red", bold=True)
else: # 5xx, or any other response
msg = color(msg, fg="magenta", bold=True)
self.log("info", '"%s" %s %s', msg, code, size)
def log_error(self, *args):
self.log("error", *args)
def log_message(self, format, *args):
self.log("info", format, *args)
def log(self, type, message, *args):
_log(
type,
"%s - - [%s] %s\n"
% (self.address_string(), self.log_date_time_string(), message % args),
)
def get_header_items(self):
"""
Get an iterable list of key/value pairs representing headers.
This function provides Python 2/3 compatibility as related to the
parsing of request headers. Python 2.7 is not compliant with
RFC 3875 Section 4.1.18 which requires multiple values for headers
to be provided or RFC 2616 which allows for folding of multi-line
headers. This function will return a matching list regardless
of Python version. It can be removed once Python 2.7 support
is dropped.
:return: List of tuples containing header hey/value pairs
"""
if PY2:
# For Python 2, process the headers manually according to
# W3C RFC 2616 Section 4.2.
items = []
for header in self.headers.headers:
# Remove "\r\n" from the header and split on ":" to get
# the field name and value.
try:
key, value = header[0:-2].split(":", 1)
except ValueError:
# If header could not be slit with : but starts with white
# space and it follows an existing header, it's a folded
# header.
if header[0] in ("\t", " ") and items:
# Pop off the last header
key, value = items.pop()
# Append the current header to the value of the last
# header which will be placed back on the end of the
# list
value = value + header
# Otherwise it's just a bad header and should error
else:
# Re-raise the value error
raise
# Add the key and the value once stripped of leading
# white space. The specification allows for stripping
# trailing white space but the Python 3 code does not
# strip trailing white space. Therefore, trailing space
# will be left as is to match the Python 3 behavior.
items.append((key, value.lstrip()))
else:
items = self.headers.items()
return items
#: backwards compatible name if someone is subclassing it
BaseRequestHandler = WSGIRequestHandler
def generate_adhoc_ssl_pair(cn=None):
try:
from cryptography import x509
from cryptography.x509.oid import NameOID
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import rsa
except ImportError:
raise TypeError("Using ad-hoc certificates requires the cryptography library.")
pkey = rsa.generate_private_key(
public_exponent=65537, key_size=2048, backend=default_backend()
)
# pretty damn sure that this is not actually accepted by anyone
if cn is None:
cn = u"*"
subject = x509.Name(
[
x509.NameAttribute(NameOID.ORGANIZATION_NAME, u"Dummy Certificate"),
x509.NameAttribute(NameOID.COMMON_NAME, cn),
]
)
cert = (
x509.CertificateBuilder()
.subject_name(subject)
.issuer_name(subject)
.public_key(pkey.public_key())
.serial_number(x509.random_serial_number())
.not_valid_before(dt.utcnow())
.not_valid_after(dt.utcnow() + timedelta(days=365))
.add_extension(x509.ExtendedKeyUsage([x509.OID_SERVER_AUTH]), critical=False)
.add_extension(
x509.SubjectAlternativeName([x509.DNSName(u"*")]), critical=False
)
.sign(pkey, hashes.SHA256(), default_backend())
)
return cert, pkey
def make_ssl_devcert(base_path, host=None, cn=None):
"""Creates an SSL key for development. This should be used instead of
the ``'adhoc'`` key which generates a new cert on each server start.
It accepts a path for where it should store the key and cert and
either a host or CN. If a host is given it will use the CN
``*.host/CN=host``.
For more information see :func:`run_simple`.
.. versionadded:: 0.9
:param base_path: the path to the certificate and key. The extension
``.crt`` is added for the certificate, ``.key`` is
added for the key.
:param host: the name of the host. This can be used as an alternative
for the `cn`.
:param cn: the `CN` to use.
"""
if host is not None:
cn = u"*.%s/CN=%s" % (host, host)
cert, pkey = generate_adhoc_ssl_pair(cn=cn)
from cryptography.hazmat.primitives import serialization
cert_file = base_path + ".crt"
pkey_file = base_path + ".key"
with open(cert_file, "wb") as f:
f.write(cert.public_bytes(serialization.Encoding.PEM))
with open(pkey_file, "wb") as f:
f.write(
pkey.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption(),
)
)
return cert_file, pkey_file
def generate_adhoc_ssl_context():
"""Generates an adhoc SSL context for the development server."""
import tempfile
import atexit
cert, pkey = generate_adhoc_ssl_pair()
from cryptography.hazmat.primitives import serialization
cert_handle, cert_file = tempfile.mkstemp()
pkey_handle, pkey_file = tempfile.mkstemp()
atexit.register(os.remove, pkey_file)
atexit.register(os.remove, cert_file)
os.write(cert_handle, cert.public_bytes(serialization.Encoding.PEM))
os.write(
pkey_handle,
pkey.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption(),
),
)
os.close(cert_handle)
os.close(pkey_handle)
ctx = load_ssl_context(cert_file, pkey_file)
return ctx
def load_ssl_context(cert_file, pkey_file=None, protocol=None):
"""Loads SSL context from cert/private key files and optional protocol.
Many parameters are directly taken from the API of
:py:class:`ssl.SSLContext`.
:param cert_file: Path of the certificate to use.
:param pkey_file: Path of the private key to use. If not given, the key
will be obtained from the certificate file.
:param protocol: One of the ``PROTOCOL_*`` constants in the stdlib ``ssl``
module. Defaults to ``PROTOCOL_SSLv23``.
"""
if protocol is None:
try:
protocol = ssl.PROTOCOL_TLS_SERVER
except AttributeError:
# Python <= 3.5 compat
protocol = ssl.PROTOCOL_SSLv23
ctx = _SSLContext(protocol)
ctx.load_cert_chain(cert_file, pkey_file)
return ctx
class _SSLContext(object):
"""A dummy class with a small subset of Python3's ``ssl.SSLContext``, only
intended to be used with and by Werkzeug."""
def __init__(self, protocol):
self._protocol = protocol
self._certfile = None
self._keyfile = None
self._password = None
def load_cert_chain(self, certfile, keyfile=None, password=None):
self._certfile = certfile
self._keyfile = keyfile or certfile
self._password = password
def wrap_socket(self, sock, **kwargs):
return ssl.wrap_socket(
sock,
keyfile=self._keyfile,
certfile=self._certfile,
ssl_version=self._protocol,
**kwargs
)
def is_ssl_error(error=None):
"""Checks if the given error (or the current one) is an SSL error."""
if error is None:
error = sys.exc_info()[1]
return isinstance(error, ssl.SSLError)
def select_address_family(host, port):
"""Return ``AF_INET4``, ``AF_INET6``, or ``AF_UNIX`` depending on
the host and port."""
# disabled due to problems with current ipv6 implementations
# and various operating systems. Probably this code also is
# not supposed to work, but I can't come up with any other
# ways to implement this.
# try:
# info = socket.getaddrinfo(host, port, socket.AF_UNSPEC,
# socket.SOCK_STREAM, 0,
# socket.AI_PASSIVE)
# if info:
# return info[0][0]
# except socket.gaierror:
# pass
if host.startswith("unix://"):
return socket.AF_UNIX
elif ":" in host and hasattr(socket, "AF_INET6"):
return socket.AF_INET6
return socket.AF_INET
def get_sockaddr(host, port, family):
"""Return a fully qualified socket address that can be passed to
:func:`socket.bind`."""
if family == af_unix:
return host.split("://", 1)[1]
try:
res = socket.getaddrinfo(
host, port, family, socket.SOCK_STREAM, socket.IPPROTO_TCP
)
except socket.gaierror:
return host, port
return res[0][4]
class BaseWSGIServer(HTTPServer, object):
"""Simple single-threaded, single-process WSGI server."""
multithread = False
multiprocess = False
request_queue_size = LISTEN_QUEUE
def __init__(
self,
host,
port,
app,
handler=None,
passthrough_errors=False,
ssl_context=None,
fd=None,
):
if handler is None:
handler = WSGIRequestHandler
self.address_family = select_address_family(host, port)
if fd is not None:
real_sock = socket.fromfd(fd, self.address_family, socket.SOCK_STREAM)
port = 0
server_address = get_sockaddr(host, int(port), self.address_family)
# remove socket file if it already exists
if self.address_family == af_unix and os.path.exists(server_address):
os.unlink(server_address)
HTTPServer.__init__(self, server_address, handler)
self.app = app
self.passthrough_errors = passthrough_errors
self.shutdown_signal = False
self.host = host
self.port = self.socket.getsockname()[1]
# Patch in the original socket.
if fd is not None:
self.socket.close()
self.socket = real_sock
self.server_address = self.socket.getsockname()
if ssl_context is not None:
if isinstance(ssl_context, tuple):
ssl_context = load_ssl_context(*ssl_context)
if ssl_context == "adhoc":
ssl_context = generate_adhoc_ssl_context()
# If we are on Python 2 the return value from socket.fromfd
# is an internal socket object but what we need for ssl wrap
# is the wrapper around it :(
sock = self.socket
if PY2 and not isinstance(sock, socket.socket):
sock = socket.socket(sock.family, sock.type, sock.proto, sock)
self.socket = ssl_context.wrap_socket(sock, server_side=True)
self.ssl_context = ssl_context
else:
self.ssl_context = None
def log(self, type, message, *args):
_log(type, message, *args)
def serve_forever(self):
self.shutdown_signal = False
try:
HTTPServer.serve_forever(self)
except KeyboardInterrupt:
pass
finally:
self.server_close()
def handle_error(self, request, client_address):
if self.passthrough_errors:
raise
# Python 2 still causes a socket.error after the earlier
# handling, so silence it here.
if isinstance(sys.exc_info()[1], _ConnectionError):
return
return HTTPServer.handle_error(self, request, client_address)
def get_request(self):
con, info = self.socket.accept()
return con, info
class ThreadedWSGIServer(ThreadingMixIn, BaseWSGIServer):
"""A WSGI server that does threading."""
multithread = True
daemon_threads = True
class ForkingWSGIServer(ForkingMixIn, BaseWSGIServer):
"""A WSGI server that does forking."""
multiprocess = True
def __init__(
self,
host,
port,
app,
processes=40,
handler=None,
passthrough_errors=False,
ssl_context=None,
fd=None,
):
if not can_fork:
raise ValueError("Your platform does not support forking.")
BaseWSGIServer.__init__(
self, host, port, app, handler, passthrough_errors, ssl_context, fd
)
self.max_children = processes
def make_server(
host=None,
port=None,
app=None,
threaded=False,
processes=1,
request_handler=None,
passthrough_errors=False,
ssl_context=None,
fd=None,
):
"""Create a new server instance that is either threaded, or forks
or just processes one request after another.
"""
if threaded and processes > 1:
raise ValueError("cannot have a multithreaded and multi process server.")
elif threaded:
return ThreadedWSGIServer(
host, port, app, request_handler, passthrough_errors, ssl_context, fd=fd
)
elif processes > 1:
return ForkingWSGIServer(
host,
port,
app,
processes,
request_handler,
passthrough_errors,
ssl_context,
fd=fd,
)
else:
return BaseWSGIServer(
host, port, app, request_handler, passthrough_errors, ssl_context, fd=fd
)
def is_running_from_reloader():
"""Checks if the application is running from within the Werkzeug
reloader subprocess.
.. versionadded:: 0.10
"""
return os.environ.get("WERKZEUG_RUN_MAIN") == "true"
def run_simple(
hostname,
port,
application,
use_reloader=False,
use_debugger=False,
use_evalex=True,
extra_files=None,
reloader_interval=1,
reloader_type="auto",
threaded=False,
processes=1,
request_handler=None,
static_files=None,
passthrough_errors=False,
ssl_context=None,
):
"""Start a WSGI application. Optional features include a reloader,
multithreading and fork support.
This function has a command-line interface too::
python -m werkzeug.serving --help
.. versionadded:: 0.5
`static_files` was added to simplify serving of static files as well
as `passthrough_errors`.
.. versionadded:: 0.6
support for SSL was added.
.. versionadded:: 0.8
Added support for automatically loading a SSL context from certificate
file and private key.
.. versionadded:: 0.9
Added command-line interface.
.. versionadded:: 0.10
Improved the reloader and added support for changing the backend
through the `reloader_type` parameter. See :ref:`reloader`
for more information.
.. versionchanged:: 0.15
Bind to a Unix socket by passing a path that starts with
``unix://`` as the ``hostname``.
:param hostname: The host to bind to, for example ``'localhost'``.
If the value is a path that starts with ``unix://`` it will bind
to a Unix socket instead of a TCP socket..
:param port: The port for the server. eg: ``8080``
:param application: the WSGI application to execute
:param use_reloader: should the server automatically restart the python
process if modules were changed?
:param use_debugger: should the werkzeug debugging system be used?
:param use_evalex: should the exception evaluation feature be enabled?
:param extra_files: a list of files the reloader should watch
additionally to the modules. For example configuration
files.
:param reloader_interval: the interval for the reloader in seconds.
:param reloader_type: the type of reloader to use. The default is
auto detection. Valid values are ``'stat'`` and
``'watchdog'``. See :ref:`reloader` for more
information.
:param threaded: should the process handle each request in a separate
thread?
:param processes: if greater than 1 then handle each request in a new process
up to this maximum number of concurrent processes.
:param request_handler: optional parameter that can be used to replace
the default one. You can use this to replace it
with a different
:class:`~BaseHTTPServer.BaseHTTPRequestHandler`
subclass.
:param static_files: a list or dict of paths for static files. This works
exactly like :class:`SharedDataMiddleware`, it's actually
just wrapping the application in that middleware before
serving.
:param passthrough_errors: set this to `True` to disable the error catching.
This means that the server will die on errors but
it can be useful to hook debuggers in (pdb etc.)
:param ssl_context: an SSL context for the connection. Either an
:class:`ssl.SSLContext`, a tuple in the form
``(cert_file, pkey_file)``, the string ``'adhoc'`` if
the server should automatically create one, or ``None``
to disable SSL (which is the default).
"""
if not isinstance(port, int):
raise TypeError("port must be an integer")
if use_debugger:
from .debug import DebuggedApplication
application = DebuggedApplication(application, use_evalex)
if static_files:
from .middleware.shared_data import SharedDataMiddleware
application = SharedDataMiddleware(application, static_files)
def log_startup(sock):
display_hostname = hostname if hostname not in ("", "*") else "localhost"
quit_msg = "(Press CTRL+C to quit)"
if sock.family == af_unix:
_log("info", " * Running on %s %s", display_hostname, quit_msg)
else:
if ":" in display_hostname:
display_hostname = "[%s]" % display_hostname
port = sock.getsockname()[1]
_log(
"info",
" * Running on %s://%s:%d/ %s",
"http" if ssl_context is None else "https",
display_hostname,
port,
quit_msg,
)
def inner():
try:
fd = int(os.environ["WERKZEUG_SERVER_FD"])
except (LookupError, ValueError):
fd = None
srv = make_server(
hostname,
port,
application,
threaded,
processes,
request_handler,
passthrough_errors,
ssl_context,
fd=fd,
)
if fd is None:
log_startup(srv.socket)
srv.serve_forever()
if use_reloader:
# If we're not running already in the subprocess that is the
# reloader we want to open up a socket early to make sure the
# port is actually available.
if not is_running_from_reloader():
if port == 0 and not can_open_by_fd:
raise ValueError(
"Cannot bind to a random port with enabled "
"reloader if the Python interpreter does "
"not support socket opening by fd."
)
# Create and destroy a socket so that any exceptions are
# raised before we spawn a separate Python interpreter and
# lose this ability.
address_family = select_address_family(hostname, port)
server_address = get_sockaddr(hostname, port, address_family)
s = socket.socket(address_family, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(server_address)
if hasattr(s, "set_inheritable"):
s.set_inheritable(True)
# If we can open the socket by file descriptor, then we can just
# reuse this one and our socket will survive the restarts.
if can_open_by_fd:
os.environ["WERKZEUG_SERVER_FD"] = str(s.fileno())
s.listen(LISTEN_QUEUE)
log_startup(s)
else:
s.close()
if address_family == af_unix:
_log("info", "Unlinking %s" % server_address)
os.unlink(server_address)
# Do not use relative imports, otherwise "python -m werkzeug.serving"
# breaks.
from ._reloader import run_with_reloader
run_with_reloader(inner, extra_files, reloader_interval, reloader_type)
else:
inner()
def run_with_reloader(*args, **kwargs):
# People keep using undocumented APIs. Do not use this function
# please, we do not guarantee that it continues working.
from ._reloader import run_with_reloader
return run_with_reloader(*args, **kwargs)
def main():
"""A simple command-line interface for :py:func:`run_simple`."""
# in contrast to argparse, this works at least under Python < 2.7
import optparse
from .utils import import_string
parser = optparse.OptionParser(usage="Usage: %prog [options] app_module:app_object")
parser.add_option(
"-b",
"--bind",
dest="address",
help="The hostname:port the app should listen on.",
)
parser.add_option(
"-d",
"--debug",
dest="use_debugger",
action="store_true",
default=False,
help="Use Werkzeug's debugger.",
)
parser.add_option(
"-r",
"--reload",
dest="use_reloader",
action="store_true",
default=False,
help="Reload Python process if modules change.",
)
options, args = parser.parse_args()
hostname, port = None, None
if options.address:
address = options.address.split(":")
hostname = address[0]
if len(address) > 1:
port = address[1]
if len(args) != 1:
sys.stdout.write("No application supplied, or too much. See --help\n")
sys.exit(1)
app = import_string(args[0])
run_simple(
hostname=(hostname or "127.0.0.1"),
port=int(port or 5000),
application=app,
use_reloader=options.use_reloader,
use_debugger=options.use_debugger,
)
if __name__ == "__main__":
main()
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/local.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.local
~~~~~~~~~~~~~~
This module implements context-local objects.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import copy
from functools import update_wrapper
from ._compat import implements_bool
from ._compat import PY2
from .wsgi import ClosingIterator
# since each thread has its own greenlet we can just use those as identifiers
# for the context. If greenlets are not available we fall back to the
# current thread ident depending on where it is.
try:
from greenlet import getcurrent as get_ident
except ImportError:
try:
from thread import get_ident
except ImportError:
from _thread import get_ident
def release_local(local):
"""Releases the contents of the local for the current context.
This makes it possible to use locals without a manager.
Example::
>>> loc = Local()
>>> loc.foo = 42
>>> release_local(loc)
>>> hasattr(loc, 'foo')
False
With this function one can release :class:`Local` objects as well
as :class:`LocalStack` objects. However it is not possible to
release data held by proxies that way, one always has to retain
a reference to the underlying local object in order to be able
to release it.
.. versionadded:: 0.6.1
"""
local.__release_local__()
class Local(object):
__slots__ = ("__storage__", "__ident_func__")
def __init__(self):
object.__setattr__(self, "__storage__", {})
object.__setattr__(self, "__ident_func__", get_ident)
def __iter__(self):
return iter(self.__storage__.items())
def __call__(self, proxy):
"""Create a proxy for a name."""
return LocalProxy(self, proxy)
def __release_local__(self):
self.__storage__.pop(self.__ident_func__(), None)
def __getattr__(self, name):
try:
return self.__storage__[self.__ident_func__()][name]
except KeyError:
raise AttributeError(name)
def __setattr__(self, name, value):
ident = self.__ident_func__()
storage = self.__storage__
try:
storage[ident][name] = value
except KeyError:
storage[ident] = {name: value}
def __delattr__(self, name):
try:
del self.__storage__[self.__ident_func__()][name]
except KeyError:
raise AttributeError(name)
class LocalStack(object):
"""This class works similar to a :class:`Local` but keeps a stack
of objects instead. This is best explained with an example::
>>> ls = LocalStack()
>>> ls.push(42)
>>> ls.top
42
>>> ls.push(23)
>>> ls.top
23
>>> ls.pop()
23
>>> ls.top
42
They can be force released by using a :class:`LocalManager` or with
the :func:`release_local` function but the correct way is to pop the
item from the stack after using. When the stack is empty it will
no longer be bound to the current context (and as such released).
By calling the stack without arguments it returns a proxy that resolves to
the topmost item on the stack.
.. versionadded:: 0.6.1
"""
def __init__(self):
self._local = Local()
def __release_local__(self):
self._local.__release_local__()
@property
def __ident_func__(self):
return self._local.__ident_func__
@__ident_func__.setter
def __ident_func__(self, value):
object.__setattr__(self._local, "__ident_func__", value)
def __call__(self):
def _lookup():
rv = self.top
if rv is None:
raise RuntimeError("object unbound")
return rv
return LocalProxy(_lookup)
def push(self, obj):
"""Pushes a new item to the stack"""
rv = getattr(self._local, "stack", None)
if rv is None:
self._local.stack = rv = []
rv.append(obj)
return rv
def pop(self):
"""Removes the topmost item from the stack, will return the
old value or `None` if the stack was already empty.
"""
stack = getattr(self._local, "stack", None)
if stack is None:
return None
elif len(stack) == 1:
release_local(self._local)
return stack[-1]
else:
return stack.pop()
@property
def top(self):
"""The topmost item on the stack. If the stack is empty,
`None` is returned.
"""
try:
return self._local.stack[-1]
except (AttributeError, IndexError):
return None
class LocalManager(object):
"""Local objects cannot manage themselves. For that you need a local
manager. You can pass a local manager multiple locals or add them later
by appending them to `manager.locals`. Every time the manager cleans up,
it will clean up all the data left in the locals for this context.
The `ident_func` parameter can be added to override the default ident
function for the wrapped locals.
.. versionchanged:: 0.6.1
Instead of a manager the :func:`release_local` function can be used
as well.
.. versionchanged:: 0.7
`ident_func` was added.
"""
def __init__(self, locals=None, ident_func=None):
if locals is None:
self.locals = []
elif isinstance(locals, Local):
self.locals = [locals]
else:
self.locals = list(locals)
if ident_func is not None:
self.ident_func = ident_func
for local in self.locals:
object.__setattr__(local, "__ident_func__", ident_func)
else:
self.ident_func = get_ident
def get_ident(self):
"""Return the context identifier the local objects use internally for
this context. You cannot override this method to change the behavior
but use it to link other context local objects (such as SQLAlchemy's
scoped sessions) to the Werkzeug locals.
.. versionchanged:: 0.7
You can pass a different ident function to the local manager that
will then be propagated to all the locals passed to the
constructor.
"""
return self.ident_func()
def cleanup(self):
"""Manually clean up the data in the locals for this context. Call
this at the end of the request or use `make_middleware()`.
"""
for local in self.locals:
release_local(local)
def make_middleware(self, app):
"""Wrap a WSGI application so that cleaning up happens after
request end.
"""
def application(environ, start_response):
return ClosingIterator(app(environ, start_response), self.cleanup)
return application
def middleware(self, func):
"""Like `make_middleware` but for decorating functions.
Example usage::
@manager.middleware
def application(environ, start_response):
...
The difference to `make_middleware` is that the function passed
will have all the arguments copied from the inner application
(name, docstring, module).
"""
return update_wrapper(self.make_middleware(func), func)
def __repr__(self):
return "<%s storages: %d>" % (self.__class__.__name__, len(self.locals))
@implements_bool
class LocalProxy(object):
"""Acts as a proxy for a werkzeug local. Forwards all operations to
a proxied object. The only operations not supported for forwarding
are right handed operands and any kind of assignment.
Example usage::
from werkzeug.local import Local
l = Local()
# these are proxies
request = l('request')
user = l('user')
from werkzeug.local import LocalStack
_response_local = LocalStack()
# this is a proxy
response = _response_local()
Whenever something is bound to l.user / l.request the proxy objects
will forward all operations. If no object is bound a :exc:`RuntimeError`
will be raised.
To create proxies to :class:`Local` or :class:`LocalStack` objects,
call the object as shown above. If you want to have a proxy to an
object looked up by a function, you can (as of Werkzeug 0.6.1) pass
a function to the :class:`LocalProxy` constructor::
session = LocalProxy(lambda: get_current_request().session)
.. versionchanged:: 0.6.1
The class can be instantiated with a callable as well now.
"""
__slots__ = ("__local", "__dict__", "__name__", "__wrapped__")
def __init__(self, local, name=None):
object.__setattr__(self, "_LocalProxy__local", local)
object.__setattr__(self, "__name__", name)
if callable(local) and not hasattr(local, "__release_local__"):
# "local" is a callable that is not an instance of Local or
# LocalManager: mark it as a wrapped function.
object.__setattr__(self, "__wrapped__", local)
def _get_current_object(self):
"""Return the current object. This is useful if you want the real
object behind the proxy at a time for performance reasons or because
you want to pass the object into a different context.
"""
if not hasattr(self.__local, "__release_local__"):
return self.__local()
try:
return getattr(self.__local, self.__name__)
except AttributeError:
raise RuntimeError("no object bound to %s" % self.__name__)
@property
def __dict__(self):
try:
return self._get_current_object().__dict__
except RuntimeError:
raise AttributeError("__dict__")
def __repr__(self):
try:
obj = self._get_current_object()
except RuntimeError:
return "<%s unbound>" % self.__class__.__name__
return repr(obj)
def __bool__(self):
try:
return bool(self._get_current_object())
except RuntimeError:
return False
def __unicode__(self):
try:
return unicode(self._get_current_object()) # noqa
except RuntimeError:
return repr(self)
def __dir__(self):
try:
return dir(self._get_current_object())
except RuntimeError:
return []
def __getattr__(self, name):
if name == "__members__":
return dir(self._get_current_object())
return getattr(self._get_current_object(), name)
def __setitem__(self, key, value):
self._get_current_object()[key] = value
def __delitem__(self, key):
del self._get_current_object()[key]
if PY2:
__getslice__ = lambda x, i, j: x._get_current_object()[i:j]
def __setslice__(self, i, j, seq):
self._get_current_object()[i:j] = seq
def __delslice__(self, i, j):
del self._get_current_object()[i:j]
__setattr__ = lambda x, n, v: setattr(x._get_current_object(), n, v)
__delattr__ = lambda x, n: delattr(x._get_current_object(), n)
__str__ = lambda x: str(x._get_current_object())
__lt__ = lambda x, o: x._get_current_object() < o
__le__ = lambda x, o: x._get_current_object() <= o
__eq__ = lambda x, o: x._get_current_object() == o
__ne__ = lambda x, o: x._get_current_object() != o
__gt__ = lambda x, o: x._get_current_object() > o
__ge__ = lambda x, o: x._get_current_object() >= o
__cmp__ = lambda x, o: cmp(x._get_current_object(), o) # noqa
__hash__ = lambda x: hash(x._get_current_object())
__call__ = lambda x, *a, **kw: x._get_current_object()(*a, **kw)
__len__ = lambda x: len(x._get_current_object())
__getitem__ = lambda x, i: x._get_current_object()[i]
__iter__ = lambda x: iter(x._get_current_object())
__contains__ = lambda x, i: i in x._get_current_object()
__add__ = lambda x, o: x._get_current_object() + o
__sub__ = lambda x, o: x._get_current_object() - o
__mul__ = lambda x, o: x._get_current_object() * o
__floordiv__ = lambda x, o: x._get_current_object() // o
__mod__ = lambda x, o: x._get_current_object() % o
__divmod__ = lambda x, o: x._get_current_object().__divmod__(o)
__pow__ = lambda x, o: x._get_current_object() ** o
__lshift__ = lambda x, o: x._get_current_object() << o
__rshift__ = lambda x, o: x._get_current_object() >> o
__and__ = lambda x, o: x._get_current_object() & o
__xor__ = lambda x, o: x._get_current_object() ^ o
__or__ = lambda x, o: x._get_current_object() | o
__div__ = lambda x, o: x._get_current_object().__div__(o)
__truediv__ = lambda x, o: x._get_current_object().__truediv__(o)
__neg__ = lambda x: -(x._get_current_object())
__pos__ = lambda x: +(x._get_current_object())
__abs__ = lambda x: abs(x._get_current_object())
__invert__ = lambda x: ~(x._get_current_object())
__complex__ = lambda x: complex(x._get_current_object())
__int__ = lambda x: int(x._get_current_object())
__long__ = lambda x: long(x._get_current_object()) # noqa
__float__ = lambda x: float(x._get_current_object())
__oct__ = lambda x: oct(x._get_current_object())
__hex__ = lambda x: hex(x._get_current_object())
__index__ = lambda x: x._get_current_object().__index__()
__coerce__ = lambda x, o: x._get_current_object().__coerce__(x, o)
__enter__ = lambda x: x._get_current_object().__enter__()
__exit__ = lambda x, *a, **kw: x._get_current_object().__exit__(*a, **kw)
__radd__ = lambda x, o: o + x._get_current_object()
__rsub__ = lambda x, o: o - x._get_current_object()
__rmul__ = lambda x, o: o * x._get_current_object()
__rdiv__ = lambda x, o: o / x._get_current_object()
if PY2:
__rtruediv__ = lambda x, o: x._get_current_object().__rtruediv__(o)
else:
__rtruediv__ = __rdiv__
__rfloordiv__ = lambda x, o: o // x._get_current_object()
__rmod__ = lambda x, o: o % x._get_current_object()
__rdivmod__ = lambda x, o: x._get_current_object().__rdivmod__(o)
__copy__ = lambda x: copy.copy(x._get_current_object())
__deepcopy__ = lambda x, memo: copy.deepcopy(x._get_current_object(), memo)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/filesystem.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.filesystem
~~~~~~~~~~~~~~~~~~~
Various utilities for the local filesystem.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import codecs
import sys
import warnings
# We do not trust traditional unixes.
has_likely_buggy_unicode_filesystem = (
sys.platform.startswith("linux") or "bsd" in sys.platform
)
def _is_ascii_encoding(encoding):
"""Given an encoding this figures out if the encoding is actually ASCII (which
is something we don't actually want in most cases). This is necessary
because ASCII comes under many names such as ANSI_X3.4-1968.
"""
if encoding is None:
return False
try:
return codecs.lookup(encoding).name == "ascii"
except LookupError:
return False
class BrokenFilesystemWarning(RuntimeWarning, UnicodeWarning):
"""The warning used by Werkzeug to signal a broken filesystem. Will only be
used once per runtime."""
_warned_about_filesystem_encoding = False
def get_filesystem_encoding():
"""Returns the filesystem encoding that should be used. Note that this is
different from the Python understanding of the filesystem encoding which
might be deeply flawed. Do not use this value against Python's unicode APIs
because it might be different. See :ref:`filesystem-encoding` for the exact
behavior.
The concept of a filesystem encoding in generally is not something you
should rely on. As such if you ever need to use this function except for
writing wrapper code reconsider.
"""
global _warned_about_filesystem_encoding
rv = sys.getfilesystemencoding()
if has_likely_buggy_unicode_filesystem and not rv or _is_ascii_encoding(rv):
if not _warned_about_filesystem_encoding:
warnings.warn(
"Detected a misconfigured UNIX filesystem: Will use"
" UTF-8 as filesystem encoding instead of {0!r}".format(rv),
BrokenFilesystemWarning,
)
_warned_about_filesystem_encoding = True
return "utf-8"
return rv
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/security.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.security
~~~~~~~~~~~~~~~~~
Security related helpers such as secure password hashing tools.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import codecs
import hashlib
import hmac
import os
import posixpath
from random import SystemRandom
from struct import Struct
from ._compat import izip
from ._compat import PY2
from ._compat import range_type
from ._compat import text_type
from ._compat import to_bytes
from ._compat import to_native
SALT_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
DEFAULT_PBKDF2_ITERATIONS = 150000
_pack_int = Struct(">I").pack
_builtin_safe_str_cmp = getattr(hmac, "compare_digest", None)
_sys_rng = SystemRandom()
_os_alt_seps = list(
sep for sep in [os.path.sep, os.path.altsep] if sep not in (None, "/")
)
def pbkdf2_hex(
data, salt, iterations=DEFAULT_PBKDF2_ITERATIONS, keylen=None, hashfunc=None
):
"""Like :func:`pbkdf2_bin`, but returns a hex-encoded string.
.. versionadded:: 0.9
:param data: the data to derive.
:param salt: the salt for the derivation.
:param iterations: the number of iterations.
:param keylen: the length of the resulting key. If not provided,
the digest size will be used.
:param hashfunc: the hash function to use. This can either be the
string name of a known hash function, or a function
from the hashlib module. Defaults to sha256.
"""
rv = pbkdf2_bin(data, salt, iterations, keylen, hashfunc)
return to_native(codecs.encode(rv, "hex_codec"))
def pbkdf2_bin(
data, salt, iterations=DEFAULT_PBKDF2_ITERATIONS, keylen=None, hashfunc=None
):
"""Returns a binary digest for the PBKDF2 hash algorithm of `data`
with the given `salt`. It iterates `iterations` times and produces a
key of `keylen` bytes. By default, SHA-256 is used as hash function;
a different hashlib `hashfunc` can be provided.
.. versionadded:: 0.9
:param data: the data to derive.
:param salt: the salt for the derivation.
:param iterations: the number of iterations.
:param keylen: the length of the resulting key. If not provided
the digest size will be used.
:param hashfunc: the hash function to use. This can either be the
string name of a known hash function or a function
from the hashlib module. Defaults to sha256.
"""
if not hashfunc:
hashfunc = "sha256"
data = to_bytes(data)
salt = to_bytes(salt)
if callable(hashfunc):
_test_hash = hashfunc()
hash_name = getattr(_test_hash, "name", None)
else:
hash_name = hashfunc
return hashlib.pbkdf2_hmac(hash_name, data, salt, iterations, keylen)
def safe_str_cmp(a, b):
"""This function compares strings in somewhat constant time. This
requires that the length of at least one string is known in advance.
Returns `True` if the two strings are equal, or `False` if they are not.
.. versionadded:: 0.7
"""
if isinstance(a, text_type):
a = a.encode("utf-8")
if isinstance(b, text_type):
b = b.encode("utf-8")
if _builtin_safe_str_cmp is not None:
return _builtin_safe_str_cmp(a, b)
if len(a) != len(b):
return False
rv = 0
if PY2:
for x, y in izip(a, b):
rv |= ord(x) ^ ord(y)
else:
for x, y in izip(a, b):
rv |= x ^ y
return rv == 0
def gen_salt(length):
"""Generate a random string of SALT_CHARS with specified ``length``."""
if length <= 0:
raise ValueError("Salt length must be positive")
return "".join(_sys_rng.choice(SALT_CHARS) for _ in range_type(length))
def _hash_internal(method, salt, password):
"""Internal password hash helper. Supports plaintext without salt,
unsalted and salted passwords. In case salted passwords are used
hmac is used.
"""
if method == "plain":
return password, method
if isinstance(password, text_type):
password = password.encode("utf-8")
if method.startswith("pbkdf2:"):
args = method[7:].split(":")
if len(args) not in (1, 2):
raise ValueError("Invalid number of arguments for PBKDF2")
method = args.pop(0)
iterations = args and int(args[0] or 0) or DEFAULT_PBKDF2_ITERATIONS
is_pbkdf2 = True
actual_method = "pbkdf2:%s:%d" % (method, iterations)
else:
is_pbkdf2 = False
actual_method = method
if is_pbkdf2:
if not salt:
raise ValueError("Salt is required for PBKDF2")
rv = pbkdf2_hex(password, salt, iterations, hashfunc=method)
elif salt:
if isinstance(salt, text_type):
salt = salt.encode("utf-8")
mac = _create_mac(salt, password, method)
rv = mac.hexdigest()
else:
rv = hashlib.new(method, password).hexdigest()
return rv, actual_method
def _create_mac(key, msg, method):
if callable(method):
return hmac.HMAC(key, msg, method)
def hashfunc(d=b""):
return hashlib.new(method, d)
# Python 2.7 used ``hasattr(digestmod, '__call__')``
# to detect if hashfunc is callable
hashfunc.__call__ = hashfunc
return hmac.HMAC(key, msg, hashfunc)
def generate_password_hash(password, method="pbkdf2:sha256", salt_length=8):
"""Hash a password with the given method and salt with a string of
the given length. The format of the string returned includes the method
that was used so that :func:`check_password_hash` can check the hash.
The format for the hashed string looks like this::
method$salt$hash
This method can **not** generate unsalted passwords but it is possible
to set param method='plain' in order to enforce plaintext passwords.
If a salt is used, hmac is used internally to salt the password.
If PBKDF2 is wanted it can be enabled by setting the method to
``pbkdf2:method:iterations`` where iterations is optional::
pbkdf2:sha256:80000$salt$hash
pbkdf2:sha256$salt$hash
:param password: the password to hash.
:param method: the hash method to use (one that hashlib supports). Can
optionally be in the format ``pbkdf2:<method>[:iterations]``
to enable PBKDF2.
:param salt_length: the length of the salt in letters.
"""
salt = gen_salt(salt_length) if method != "plain" else ""
h, actual_method = _hash_internal(method, salt, password)
return "%s$%s$%s" % (actual_method, salt, h)
def check_password_hash(pwhash, password):
"""check a password against a given salted and hashed password value.
In order to support unsalted legacy passwords this method supports
plain text passwords, md5 and sha1 hashes (both salted and unsalted).
Returns `True` if the password matched, `False` otherwise.
:param pwhash: a hashed string like returned by
:func:`generate_password_hash`.
:param password: the plaintext password to compare against the hash.
"""
if pwhash.count("$") < 2:
return False
method, salt, hashval = pwhash.split("$", 2)
return safe_str_cmp(_hash_internal(method, salt, password)[0], hashval)
def safe_join(directory, *pathnames):
"""Safely join zero or more untrusted path components to a base
directory to avoid escaping the base directory.
:param directory: The trusted base directory.
:param pathnames: The untrusted path components relative to the
base directory.
:return: A safe path, otherwise ``None``.
"""
parts = [directory]
for filename in pathnames:
if filename != "":
filename = posixpath.normpath(filename)
if (
any(sep in filename for sep in _os_alt_seps)
or os.path.isabs(filename)
or filename == ".."
or filename.startswith("../")
):
return None
parts.append(filename)
return posixpath.join(*parts)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/__init__.py
|
"""
werkzeug
~~~~~~~~
Werkzeug is the Swiss Army knife of Python web development.
It provides useful classes and functions for any WSGI application to
make the life of a Python web developer much easier. All of the provided
classes are independent from each other so you can mix it with any other
library.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
from .serving import run_simple
from .test import Client
from .wrappers import Request
from .wrappers import Response
__version__ = "1.0.1"
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/test.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.test
~~~~~~~~~~~~~
This module implements a client to WSGI applications for testing.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import mimetypes
import sys
from io import BytesIO
from itertools import chain
from random import random
from tempfile import TemporaryFile
from time import time
from ._compat import iteritems
from ._compat import iterlists
from ._compat import itervalues
from ._compat import make_literal_wrapper
from ._compat import reraise
from ._compat import string_types
from ._compat import text_type
from ._compat import to_bytes
from ._compat import wsgi_encoding_dance
from ._internal import _get_environ
from .datastructures import CallbackDict
from .datastructures import CombinedMultiDict
from .datastructures import EnvironHeaders
from .datastructures import FileMultiDict
from .datastructures import Headers
from .datastructures import MultiDict
from .http import dump_cookie
from .http import dump_options_header
from .http import parse_options_header
from .urls import iri_to_uri
from .urls import url_encode
from .urls import url_fix
from .urls import url_parse
from .urls import url_unparse
from .urls import url_unquote
from .utils import get_content_type
from .wrappers import BaseRequest
from .wsgi import ClosingIterator
from .wsgi import get_current_url
try:
from urllib.request import Request as U2Request
except ImportError:
from urllib2 import Request as U2Request
try:
from http.cookiejar import CookieJar
except ImportError:
from cookielib import CookieJar
def stream_encode_multipart(
values, use_tempfile=True, threshold=1024 * 500, boundary=None, charset="utf-8"
):
"""Encode a dict of values (either strings or file descriptors or
:class:`FileStorage` objects.) into a multipart encoded string stored
in a file descriptor.
"""
if boundary is None:
boundary = "---------------WerkzeugFormPart_%s%s" % (time(), random())
_closure = [BytesIO(), 0, False]
if use_tempfile:
def write_binary(string):
stream, total_length, on_disk = _closure
if on_disk:
stream.write(string)
else:
length = len(string)
if length + _closure[1] <= threshold:
stream.write(string)
else:
new_stream = TemporaryFile("wb+")
new_stream.write(stream.getvalue())
new_stream.write(string)
_closure[0] = new_stream
_closure[2] = True
_closure[1] = total_length + length
else:
write_binary = _closure[0].write
def write(string):
write_binary(string.encode(charset))
if not isinstance(values, MultiDict):
values = MultiDict(values)
for key, values in iterlists(values):
for value in values:
write('--%s\r\nContent-Disposition: form-data; name="%s"' % (boundary, key))
reader = getattr(value, "read", None)
if reader is not None:
filename = getattr(value, "filename", getattr(value, "name", None))
content_type = getattr(value, "content_type", None)
if content_type is None:
content_type = (
filename
and mimetypes.guess_type(filename)[0]
or "application/octet-stream"
)
if filename is not None:
write('; filename="%s"\r\n' % filename)
else:
write("\r\n")
write("Content-Type: %s\r\n\r\n" % content_type)
while 1:
chunk = reader(16384)
if not chunk:
break
write_binary(chunk)
else:
if not isinstance(value, string_types):
value = str(value)
value = to_bytes(value, charset)
write("\r\n\r\n")
write_binary(value)
write("\r\n")
write("--%s--\r\n" % boundary)
length = int(_closure[0].tell())
_closure[0].seek(0)
return _closure[0], length, boundary
def encode_multipart(values, boundary=None, charset="utf-8"):
"""Like `stream_encode_multipart` but returns a tuple in the form
(``boundary``, ``data``) where data is a bytestring.
"""
stream, length, boundary = stream_encode_multipart(
values, use_tempfile=False, boundary=boundary, charset=charset
)
return boundary, stream.read()
class _TestCookieHeaders(object):
"""A headers adapter for cookielib
"""
def __init__(self, headers):
self.headers = headers
def getheaders(self, name):
headers = []
name = name.lower()
for k, v in self.headers:
if k.lower() == name:
headers.append(v)
return headers
def get_all(self, name, default=None):
rv = []
for k, v in self.headers:
if k.lower() == name.lower():
rv.append(v)
return rv or default or []
class _TestCookieResponse(object):
"""Something that looks like a httplib.HTTPResponse, but is actually just an
adapter for our test responses to make them available for cookielib.
"""
def __init__(self, headers):
self.headers = _TestCookieHeaders(headers)
def info(self):
return self.headers
class _TestCookieJar(CookieJar):
"""A cookielib.CookieJar modified to inject and read cookie headers from
and to wsgi environments, and wsgi application responses.
"""
def inject_wsgi(self, environ):
"""Inject the cookies as client headers into the server's wsgi
environment.
"""
cvals = ["%s=%s" % (c.name, c.value) for c in self]
if cvals:
environ["HTTP_COOKIE"] = "; ".join(cvals)
else:
environ.pop("HTTP_COOKIE", None)
def extract_wsgi(self, environ, headers):
"""Extract the server's set-cookie headers as cookies into the
cookie jar.
"""
self.extract_cookies(
_TestCookieResponse(headers), U2Request(get_current_url(environ))
)
def _iter_data(data):
"""Iterates over a `dict` or :class:`MultiDict` yielding all keys and
values.
This is used to iterate over the data passed to the
:class:`EnvironBuilder`.
"""
if isinstance(data, MultiDict):
for key, values in iterlists(data):
for value in values:
yield key, value
else:
for key, values in iteritems(data):
if isinstance(values, list):
for value in values:
yield key, value
else:
yield key, values
class EnvironBuilder(object):
"""This class can be used to conveniently create a WSGI environment
for testing purposes. It can be used to quickly create WSGI environments
or request objects from arbitrary data.
The signature of this class is also used in some other places as of
Werkzeug 0.5 (:func:`create_environ`, :meth:`BaseResponse.from_values`,
:meth:`Client.open`). Because of this most of the functionality is
available through the constructor alone.
Files and regular form data can be manipulated independently of each
other with the :attr:`form` and :attr:`files` attributes, but are
passed with the same argument to the constructor: `data`.
`data` can be any of these values:
- a `str` or `bytes` object: The object is converted into an
:attr:`input_stream`, the :attr:`content_length` is set and you have to
provide a :attr:`content_type`.
- a `dict` or :class:`MultiDict`: The keys have to be strings. The values
have to be either any of the following objects, or a list of any of the
following objects:
- a :class:`file`-like object: These are converted into
:class:`FileStorage` objects automatically.
- a `tuple`: The :meth:`~FileMultiDict.add_file` method is called
with the key and the unpacked `tuple` items as positional
arguments.
- a `str`: The string is set as form data for the associated key.
- a file-like object: The object content is loaded in memory and then
handled like a regular `str` or a `bytes`.
:param path: the path of the request. In the WSGI environment this will
end up as `PATH_INFO`. If the `query_string` is not defined
and there is a question mark in the `path` everything after
it is used as query string.
:param base_url: the base URL is a URL that is used to extract the WSGI
URL scheme, host (server name + server port) and the
script root (`SCRIPT_NAME`).
:param query_string: an optional string or dict with URL parameters.
:param method: the HTTP method to use, defaults to `GET`.
:param input_stream: an optional input stream. Do not specify this and
`data`. As soon as an input stream is set you can't
modify :attr:`args` and :attr:`files` unless you
set the :attr:`input_stream` to `None` again.
:param content_type: The content type for the request. As of 0.5 you
don't have to provide this when specifying files
and form data via `data`.
:param content_length: The content length for the request. You don't
have to specify this when providing data via
`data`.
:param errors_stream: an optional error stream that is used for
`wsgi.errors`. Defaults to :data:`stderr`.
:param multithread: controls `wsgi.multithread`. Defaults to `False`.
:param multiprocess: controls `wsgi.multiprocess`. Defaults to `False`.
:param run_once: controls `wsgi.run_once`. Defaults to `False`.
:param headers: an optional list or :class:`Headers` object of headers.
:param data: a string or dict of form data or a file-object.
See explanation above.
:param json: An object to be serialized and assigned to ``data``.
Defaults the content type to ``"application/json"``.
Serialized with the function assigned to :attr:`json_dumps`.
:param environ_base: an optional dict of environment defaults.
:param environ_overrides: an optional dict of environment overrides.
:param charset: the charset used to encode unicode data.
.. versionadded:: 0.15
The ``json`` param and :meth:`json_dumps` method.
.. versionadded:: 0.15
The environ has keys ``REQUEST_URI`` and ``RAW_URI`` containing
the path before perecent-decoding. This is not part of the WSGI
PEP, but many WSGI servers include it.
.. versionchanged:: 0.6
``path`` and ``base_url`` can now be unicode strings that are
encoded with :func:`iri_to_uri`.
"""
#: the server protocol to use. defaults to HTTP/1.1
server_protocol = "HTTP/1.1"
#: the wsgi version to use. defaults to (1, 0)
wsgi_version = (1, 0)
#: the default request class for :meth:`get_request`
request_class = BaseRequest
import json
#: The serialization function used when ``json`` is passed.
json_dumps = staticmethod(json.dumps)
del json
def __init__(
self,
path="/",
base_url=None,
query_string=None,
method="GET",
input_stream=None,
content_type=None,
content_length=None,
errors_stream=None,
multithread=False,
multiprocess=False,
run_once=False,
headers=None,
data=None,
environ_base=None,
environ_overrides=None,
charset="utf-8",
mimetype=None,
json=None,
):
path_s = make_literal_wrapper(path)
if query_string is not None and path_s("?") in path:
raise ValueError("Query string is defined in the path and as an argument")
if query_string is None and path_s("?") in path:
path, query_string = path.split(path_s("?"), 1)
self.charset = charset
self.path = iri_to_uri(path)
if base_url is not None:
base_url = url_fix(iri_to_uri(base_url, charset), charset)
self.base_url = base_url
if isinstance(query_string, (bytes, text_type)):
self.query_string = query_string
else:
if query_string is None:
query_string = MultiDict()
elif not isinstance(query_string, MultiDict):
query_string = MultiDict(query_string)
self.args = query_string
self.method = method
if headers is None:
headers = Headers()
elif not isinstance(headers, Headers):
headers = Headers(headers)
self.headers = headers
if content_type is not None:
self.content_type = content_type
if errors_stream is None:
errors_stream = sys.stderr
self.errors_stream = errors_stream
self.multithread = multithread
self.multiprocess = multiprocess
self.run_once = run_once
self.environ_base = environ_base
self.environ_overrides = environ_overrides
self.input_stream = input_stream
self.content_length = content_length
self.closed = False
if json is not None:
if data is not None:
raise TypeError("can't provide both json and data")
data = self.json_dumps(json)
if self.content_type is None:
self.content_type = "application/json"
if data:
if input_stream is not None:
raise TypeError("can't provide input stream and data")
if hasattr(data, "read"):
data = data.read()
if isinstance(data, text_type):
data = data.encode(self.charset)
if isinstance(data, bytes):
self.input_stream = BytesIO(data)
if self.content_length is None:
self.content_length = len(data)
else:
for key, value in _iter_data(data):
if isinstance(value, (tuple, dict)) or hasattr(value, "read"):
self._add_file_from_data(key, value)
else:
self.form.setlistdefault(key).append(value)
if mimetype is not None:
self.mimetype = mimetype
@classmethod
def from_environ(cls, environ, **kwargs):
"""Turn an environ dict back into a builder. Any extra kwargs
override the args extracted from the environ.
.. versionadded:: 0.15
"""
headers = Headers(EnvironHeaders(environ))
out = {
"path": environ["PATH_INFO"],
"base_url": cls._make_base_url(
environ["wsgi.url_scheme"], headers.pop("Host"), environ["SCRIPT_NAME"]
),
"query_string": environ["QUERY_STRING"],
"method": environ["REQUEST_METHOD"],
"input_stream": environ["wsgi.input"],
"content_type": headers.pop("Content-Type", None),
"content_length": headers.pop("Content-Length", None),
"errors_stream": environ["wsgi.errors"],
"multithread": environ["wsgi.multithread"],
"multiprocess": environ["wsgi.multiprocess"],
"run_once": environ["wsgi.run_once"],
"headers": headers,
}
out.update(kwargs)
return cls(**out)
def _add_file_from_data(self, key, value):
"""Called in the EnvironBuilder to add files from the data dict."""
if isinstance(value, tuple):
self.files.add_file(key, *value)
else:
self.files.add_file(key, value)
@staticmethod
def _make_base_url(scheme, host, script_root):
return url_unparse((scheme, host, script_root, "", "")).rstrip("/") + "/"
@property
def base_url(self):
"""The base URL is used to extract the URL scheme, host name,
port, and root path.
"""
return self._make_base_url(self.url_scheme, self.host, self.script_root)
@base_url.setter
def base_url(self, value):
if value is None:
scheme = "http"
netloc = "localhost"
script_root = ""
else:
scheme, netloc, script_root, qs, anchor = url_parse(value)
if qs or anchor:
raise ValueError("base url must not contain a query string or fragment")
self.script_root = script_root.rstrip("/")
self.host = netloc
self.url_scheme = scheme
@property
def content_type(self):
"""The content type for the request. Reflected from and to
the :attr:`headers`. Do not set if you set :attr:`files` or
:attr:`form` for auto detection.
"""
ct = self.headers.get("Content-Type")
if ct is None and not self._input_stream:
if self._files:
return "multipart/form-data"
if self._form:
return "application/x-www-form-urlencoded"
return None
return ct
@content_type.setter
def content_type(self, value):
if value is None:
self.headers.pop("Content-Type", None)
else:
self.headers["Content-Type"] = value
@property
def mimetype(self):
"""The mimetype (content type without charset etc.)
.. versionadded:: 0.14
"""
ct = self.content_type
return ct.split(";")[0].strip() if ct else None
@mimetype.setter
def mimetype(self, value):
self.content_type = get_content_type(value, self.charset)
@property
def mimetype_params(self):
""" The mimetype parameters as dict. For example if the
content type is ``text/html; charset=utf-8`` the params would be
``{'charset': 'utf-8'}``.
.. versionadded:: 0.14
"""
def on_update(d):
self.headers["Content-Type"] = dump_options_header(self.mimetype, d)
d = parse_options_header(self.headers.get("content-type", ""))[1]
return CallbackDict(d, on_update)
@property
def content_length(self):
"""The content length as integer. Reflected from and to the
:attr:`headers`. Do not set if you set :attr:`files` or
:attr:`form` for auto detection.
"""
return self.headers.get("Content-Length", type=int)
@content_length.setter
def content_length(self, value):
if value is None:
self.headers.pop("Content-Length", None)
else:
self.headers["Content-Length"] = str(value)
def _get_form(self, name, storage):
"""Common behavior for getting the :attr:`form` and
:attr:`files` properties.
:param name: Name of the internal cached attribute.
:param storage: Storage class used for the data.
"""
if self.input_stream is not None:
raise AttributeError("an input stream is defined")
rv = getattr(self, name)
if rv is None:
rv = storage()
setattr(self, name, rv)
return rv
def _set_form(self, name, value):
"""Common behavior for setting the :attr:`form` and
:attr:`files` properties.
:param name: Name of the internal cached attribute.
:param value: Value to assign to the attribute.
"""
self._input_stream = None
setattr(self, name, value)
@property
def form(self):
"""A :class:`MultiDict` of form values."""
return self._get_form("_form", MultiDict)
@form.setter
def form(self, value):
self._set_form("_form", value)
@property
def files(self):
"""A :class:`FileMultiDict` of uploaded files. Use
:meth:`~FileMultiDict.add_file` to add new files.
"""
return self._get_form("_files", FileMultiDict)
@files.setter
def files(self, value):
self._set_form("_files", value)
@property
def input_stream(self):
"""An optional input stream. If you set this it will clear
:attr:`form` and :attr:`files`.
"""
return self._input_stream
@input_stream.setter
def input_stream(self, value):
self._input_stream = value
self._form = None
self._files = None
@property
def query_string(self):
"""The query string. If you set this to a string
:attr:`args` will no longer be available.
"""
if self._query_string is None:
if self._args is not None:
return url_encode(self._args, charset=self.charset)
return ""
return self._query_string
@query_string.setter
def query_string(self, value):
self._query_string = value
self._args = None
@property
def args(self):
"""The URL arguments as :class:`MultiDict`."""
if self._query_string is not None:
raise AttributeError("a query string is defined")
if self._args is None:
self._args = MultiDict()
return self._args
@args.setter
def args(self, value):
self._query_string = None
self._args = value
@property
def server_name(self):
"""The server name (read-only, use :attr:`host` to set)"""
return self.host.split(":", 1)[0]
@property
def server_port(self):
"""The server port as integer (read-only, use :attr:`host` to set)"""
pieces = self.host.split(":", 1)
if len(pieces) == 2 and pieces[1].isdigit():
return int(pieces[1])
if self.url_scheme == "https":
return 443
return 80
def __del__(self):
try:
self.close()
except Exception:
pass
def close(self):
"""Closes all files. If you put real :class:`file` objects into the
:attr:`files` dict you can call this method to automatically close
them all in one go.
"""
if self.closed:
return
try:
files = itervalues(self.files)
except AttributeError:
files = ()
for f in files:
try:
f.close()
except Exception:
pass
self.closed = True
def get_environ(self):
"""Return the built environ.
.. versionchanged:: 0.15
The content type and length headers are set based on
input stream detection. Previously this only set the WSGI
keys.
"""
input_stream = self.input_stream
content_length = self.content_length
mimetype = self.mimetype
content_type = self.content_type
if input_stream is not None:
start_pos = input_stream.tell()
input_stream.seek(0, 2)
end_pos = input_stream.tell()
input_stream.seek(start_pos)
content_length = end_pos - start_pos
elif mimetype == "multipart/form-data":
values = CombinedMultiDict([self.form, self.files])
input_stream, content_length, boundary = stream_encode_multipart(
values, charset=self.charset
)
content_type = mimetype + '; boundary="%s"' % boundary
elif mimetype == "application/x-www-form-urlencoded":
# XXX: py2v3 review
values = url_encode(self.form, charset=self.charset)
values = values.encode("ascii")
content_length = len(values)
input_stream = BytesIO(values)
else:
input_stream = BytesIO()
result = {}
if self.environ_base:
result.update(self.environ_base)
def _path_encode(x):
return wsgi_encoding_dance(url_unquote(x, self.charset), self.charset)
qs = wsgi_encoding_dance(self.query_string)
result.update(
{
"REQUEST_METHOD": self.method,
"SCRIPT_NAME": _path_encode(self.script_root),
"PATH_INFO": _path_encode(self.path),
"QUERY_STRING": qs,
# Non-standard, added by mod_wsgi, uWSGI
"REQUEST_URI": wsgi_encoding_dance(self.path),
# Non-standard, added by gunicorn
"RAW_URI": wsgi_encoding_dance(self.path),
"SERVER_NAME": self.server_name,
"SERVER_PORT": str(self.server_port),
"HTTP_HOST": self.host,
"SERVER_PROTOCOL": self.server_protocol,
"wsgi.version": self.wsgi_version,
"wsgi.url_scheme": self.url_scheme,
"wsgi.input": input_stream,
"wsgi.errors": self.errors_stream,
"wsgi.multithread": self.multithread,
"wsgi.multiprocess": self.multiprocess,
"wsgi.run_once": self.run_once,
}
)
headers = self.headers.copy()
if content_type is not None:
result["CONTENT_TYPE"] = content_type
headers.set("Content-Type", content_type)
if content_length is not None:
result["CONTENT_LENGTH"] = str(content_length)
headers.set("Content-Length", content_length)
for key, value in headers.to_wsgi_list():
result["HTTP_%s" % key.upper().replace("-", "_")] = value
if self.environ_overrides:
result.update(self.environ_overrides)
return result
def get_request(self, cls=None):
"""Returns a request with the data. If the request class is not
specified :attr:`request_class` is used.
:param cls: The request wrapper to use.
"""
if cls is None:
cls = self.request_class
return cls(self.get_environ())
class ClientRedirectError(Exception):
"""If a redirect loop is detected when using follow_redirects=True with
the :cls:`Client`, then this exception is raised.
"""
class Client(object):
"""This class allows you to send requests to a wrapped application.
The response wrapper can be a class or factory function that takes
three arguments: app_iter, status and headers. The default response
wrapper just returns a tuple.
Example::
class ClientResponse(BaseResponse):
...
client = Client(MyApplication(), response_wrapper=ClientResponse)
The use_cookies parameter indicates whether cookies should be stored and
sent for subsequent requests. This is True by default, but passing False
will disable this behaviour.
If you want to request some subdomain of your application you may set
`allow_subdomain_redirects` to `True` as if not no external redirects
are allowed.
.. versionadded:: 0.5
`use_cookies` is new in this version. Older versions did not provide
builtin cookie support.
.. versionadded:: 0.14
The `mimetype` parameter was added.
.. versionadded:: 0.15
The ``json`` parameter.
"""
def __init__(
self,
application,
response_wrapper=None,
use_cookies=True,
allow_subdomain_redirects=False,
):
self.application = application
self.response_wrapper = response_wrapper
if use_cookies:
self.cookie_jar = _TestCookieJar()
else:
self.cookie_jar = None
self.allow_subdomain_redirects = allow_subdomain_redirects
def set_cookie(
self,
server_name,
key,
value="",
max_age=None,
expires=None,
path="/",
domain=None,
secure=None,
httponly=False,
samesite=None,
charset="utf-8",
):
"""Sets a cookie in the client's cookie jar. The server name
is required and has to match the one that is also passed to
the open call.
"""
assert self.cookie_jar is not None, "cookies disabled"
header = dump_cookie(
key,
value,
max_age,
expires,
path,
domain,
secure,
httponly,
charset,
samesite=samesite,
)
environ = create_environ(path, base_url="http://" + server_name)
headers = [("Set-Cookie", header)]
self.cookie_jar.extract_wsgi(environ, headers)
def delete_cookie(self, server_name, key, path="/", domain=None):
"""Deletes a cookie in the test client."""
self.set_cookie(
server_name, key, expires=0, max_age=0, path=path, domain=domain
)
def run_wsgi_app(self, environ, buffered=False):
"""Runs the wrapped WSGI app with the given environment."""
if self.cookie_jar is not None:
self.cookie_jar.inject_wsgi(environ)
rv = run_wsgi_app(self.application, environ, buffered=buffered)
if self.cookie_jar is not None:
self.cookie_jar.extract_wsgi(environ, rv[2])
return rv
def resolve_redirect(self, response, new_location, environ, buffered=False):
"""Perform a new request to the location given by the redirect
response to the previous request.
"""
scheme, netloc, path, qs, anchor = url_parse(new_location)
builder = EnvironBuilder.from_environ(environ, query_string=qs)
to_name_parts = netloc.split(":", 1)[0].split(".")
from_name_parts = builder.server_name.split(".")
if to_name_parts != [""]:
# The new location has a host, use it for the base URL.
builder.url_scheme = scheme
builder.host = netloc
else:
# A local redirect with autocorrect_location_header=False
# doesn't have a host, so use the request's host.
to_name_parts = from_name_parts
# Explain why a redirect to a different server name won't be followed.
if to_name_parts != from_name_parts:
if to_name_parts[-len(from_name_parts) :] == from_name_parts:
if not self.allow_subdomain_redirects:
raise RuntimeError("Following subdomain redirects is not enabled.")
else:
raise RuntimeError("Following external redirects is not supported.")
path_parts = path.split("/")
root_parts = builder.script_root.split("/")
if path_parts[: len(root_parts)] == root_parts:
# Strip the script root from the path.
builder.path = path[len(builder.script_root) :]
else:
# The new location is not under the script root, so use the
# whole path and clear the previous root.
builder.path = path
builder.script_root = ""
status_code = int(response[1].split(None, 1)[0])
# Only 307 and 308 preserve all of the original request.
if status_code not in {307, 308}:
# HEAD is preserved, everything else becomes GET.
if builder.method != "HEAD":
builder.method = "GET"
# Clear the body and the headers that describe it.
builder.input_stream = None
builder.content_type = None
builder.content_length = None
builder.headers.pop("Transfer-Encoding", None)
# Disable the response wrapper while handling redirects. Not
# thread safe, but the client should not be shared anyway.
old_response_wrapper = self.response_wrapper
self.response_wrapper = None
try:
return self.open(builder, as_tuple=True, buffered=buffered)
finally:
self.response_wrapper = old_response_wrapper
def open(self, *args, **kwargs):
"""Takes the same arguments as the :class:`EnvironBuilder` class with
some additions: You can provide a :class:`EnvironBuilder` or a WSGI
environment as only argument instead of the :class:`EnvironBuilder`
arguments and two optional keyword arguments (`as_tuple`, `buffered`)
that change the type of the return value or the way the application is
executed.
.. versionchanged:: 0.5
If a dict is provided as file in the dict for the `data` parameter
the content type has to be called `content_type` now instead of
`mimetype`. This change was made for consistency with
:class:`werkzeug.FileWrapper`.
The `follow_redirects` parameter was added to :func:`open`.
Additional parameters:
:param as_tuple: Returns a tuple in the form ``(environ, result)``
:param buffered: Set this to True to buffer the application run.
This will automatically close the application for
you as well.
:param follow_redirects: Set this to True if the `Client` should
follow HTTP redirects.
"""
as_tuple = kwargs.pop("as_tuple", False)
buffered = kwargs.pop("buffered", False)
follow_redirects = kwargs.pop("follow_redirects", False)
environ = None
if not kwargs and len(args) == 1:
if isinstance(args[0], EnvironBuilder):
environ = args[0].get_environ()
elif isinstance(args[0], dict):
environ = args[0]
if environ is None:
builder = EnvironBuilder(*args, **kwargs)
try:
environ = builder.get_environ()
finally:
builder.close()
response = self.run_wsgi_app(environ.copy(), buffered=buffered)
# handle redirects
redirect_chain = []
while 1:
status_code = int(response[1].split(None, 1)[0])
if (
status_code not in {301, 302, 303, 305, 307, 308}
or not follow_redirects
):
break
# Exhaust intermediate response bodies to ensure middleware
# that returns an iterator runs any cleanup code.
if not buffered:
for _ in response[0]:
pass
new_location = response[2]["location"]
new_redirect_entry = (new_location, status_code)
if new_redirect_entry in redirect_chain:
raise ClientRedirectError("loop detected")
redirect_chain.append(new_redirect_entry)
environ, response = self.resolve_redirect(
response, new_location, environ, buffered=buffered
)
if self.response_wrapper is not None:
response = self.response_wrapper(*response)
if as_tuple:
return environ, response
return response
def get(self, *args, **kw):
"""Like open but method is enforced to GET."""
kw["method"] = "GET"
return self.open(*args, **kw)
def patch(self, *args, **kw):
"""Like open but method is enforced to PATCH."""
kw["method"] = "PATCH"
return self.open(*args, **kw)
def post(self, *args, **kw):
"""Like open but method is enforced to POST."""
kw["method"] = "POST"
return self.open(*args, **kw)
def head(self, *args, **kw):
"""Like open but method is enforced to HEAD."""
kw["method"] = "HEAD"
return self.open(*args, **kw)
def put(self, *args, **kw):
"""Like open but method is enforced to PUT."""
kw["method"] = "PUT"
return self.open(*args, **kw)
def delete(self, *args, **kw):
"""Like open but method is enforced to DELETE."""
kw["method"] = "DELETE"
return self.open(*args, **kw)
def options(self, *args, **kw):
"""Like open but method is enforced to OPTIONS."""
kw["method"] = "OPTIONS"
return self.open(*args, **kw)
def trace(self, *args, **kw):
"""Like open but method is enforced to TRACE."""
kw["method"] = "TRACE"
return self.open(*args, **kw)
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, self.application)
def create_environ(*args, **kwargs):
"""Create a new WSGI environ dict based on the values passed. The first
parameter should be the path of the request which defaults to '/'. The
second one can either be an absolute path (in that case the host is
localhost:80) or a full path to the request with scheme, netloc port and
the path to the script.
This accepts the same arguments as the :class:`EnvironBuilder`
constructor.
.. versionchanged:: 0.5
This function is now a thin wrapper over :class:`EnvironBuilder` which
was added in 0.5. The `headers`, `environ_base`, `environ_overrides`
and `charset` parameters were added.
"""
builder = EnvironBuilder(*args, **kwargs)
try:
return builder.get_environ()
finally:
builder.close()
def run_wsgi_app(app, environ, buffered=False):
"""Return a tuple in the form (app_iter, status, headers) of the
application output. This works best if you pass it an application that
returns an iterator all the time.
Sometimes applications may use the `write()` callable returned
by the `start_response` function. This tries to resolve such edge
cases automatically. But if you don't get the expected output you
should set `buffered` to `True` which enforces buffering.
If passed an invalid WSGI application the behavior of this function is
undefined. Never pass non-conforming WSGI applications to this function.
:param app: the application to execute.
:param buffered: set to `True` to enforce buffering.
:return: tuple in the form ``(app_iter, status, headers)``
"""
environ = _get_environ(environ)
response = []
buffer = []
def start_response(status, headers, exc_info=None):
if exc_info is not None:
reraise(*exc_info)
response[:] = [status, headers]
return buffer.append
app_rv = app(environ, start_response)
close_func = getattr(app_rv, "close", None)
app_iter = iter(app_rv)
# when buffering we emit the close call early and convert the
# application iterator into a regular list
if buffered:
try:
app_iter = list(app_iter)
finally:
if close_func is not None:
close_func()
# otherwise we iterate the application iter until we have a response, chain
# the already received data with the already collected data and wrap it in
# a new `ClosingIterator` if we need to restore a `close` callable from the
# original return value.
else:
for item in app_iter:
buffer.append(item)
if response:
break
if buffer:
app_iter = chain(buffer, app_iter)
if close_func is not None and app_iter is not app_rv:
app_iter = ClosingIterator(app_iter, close_func)
return app_iter, response[0], Headers(response[1])
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/formparser.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.formparser
~~~~~~~~~~~~~~~~~~~
This module implements the form parsing. It supports url-encoded forms
as well as non-nested multipart uploads.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import codecs
import re
from functools import update_wrapper
from itertools import chain
from itertools import repeat
from itertools import tee
from . import exceptions
from ._compat import BytesIO
from ._compat import text_type
from ._compat import to_native
from .datastructures import FileStorage
from .datastructures import Headers
from .datastructures import MultiDict
from .http import parse_options_header
from .urls import url_decode_stream
from .wsgi import get_content_length
from .wsgi import get_input_stream
from .wsgi import make_line_iter
# there are some platforms where SpooledTemporaryFile is not available.
# In that case we need to provide a fallback.
try:
from tempfile import SpooledTemporaryFile
except ImportError:
from tempfile import TemporaryFile
SpooledTemporaryFile = None
#: an iterator that yields empty strings
_empty_string_iter = repeat("")
#: a regular expression for multipart boundaries
_multipart_boundary_re = re.compile("^[ -~]{0,200}[!-~]$")
#: supported http encodings that are also available in python we support
#: for multipart messages.
_supported_multipart_encodings = frozenset(["base64", "quoted-printable"])
def default_stream_factory(
total_content_length, filename, content_type, content_length=None
):
"""The stream factory that is used per default."""
max_size = 1024 * 500
if SpooledTemporaryFile is not None:
return SpooledTemporaryFile(max_size=max_size, mode="wb+")
if total_content_length is None or total_content_length > max_size:
return TemporaryFile("wb+")
return BytesIO()
def parse_form_data(
environ,
stream_factory=None,
charset="utf-8",
errors="replace",
max_form_memory_size=None,
max_content_length=None,
cls=None,
silent=True,
):
"""Parse the form data in the environ and return it as tuple in the form
``(stream, form, files)``. You should only call this method if the
transport method is `POST`, `PUT`, or `PATCH`.
If the mimetype of the data transmitted is `multipart/form-data` the
files multidict will be filled with `FileStorage` objects. If the
mimetype is unknown the input stream is wrapped and returned as first
argument, else the stream is empty.
This is a shortcut for the common usage of :class:`FormDataParser`.
Have a look at :ref:`dealing-with-request-data` for more details.
.. versionadded:: 0.5
The `max_form_memory_size`, `max_content_length` and
`cls` parameters were added.
.. versionadded:: 0.5.1
The optional `silent` flag was added.
:param environ: the WSGI environment to be used for parsing.
:param stream_factory: An optional callable that returns a new read and
writeable file descriptor. This callable works
the same as :meth:`~BaseResponse._get_file_stream`.
:param charset: The character set for URL and url encoded form data.
:param errors: The encoding error behavior.
:param max_form_memory_size: the maximum number of bytes to be accepted for
in-memory stored form data. If the data
exceeds the value specified an
:exc:`~exceptions.RequestEntityTooLarge`
exception is raised.
:param max_content_length: If this is provided and the transmitted data
is longer than this value an
:exc:`~exceptions.RequestEntityTooLarge`
exception is raised.
:param cls: an optional dict class to use. If this is not specified
or `None` the default :class:`MultiDict` is used.
:param silent: If set to False parsing errors will not be caught.
:return: A tuple in the form ``(stream, form, files)``.
"""
return FormDataParser(
stream_factory,
charset,
errors,
max_form_memory_size,
max_content_length,
cls,
silent,
).parse_from_environ(environ)
def exhaust_stream(f):
"""Helper decorator for methods that exhausts the stream on return."""
def wrapper(self, stream, *args, **kwargs):
try:
return f(self, stream, *args, **kwargs)
finally:
exhaust = getattr(stream, "exhaust", None)
if exhaust is not None:
exhaust()
else:
while 1:
chunk = stream.read(1024 * 64)
if not chunk:
break
return update_wrapper(wrapper, f)
class FormDataParser(object):
"""This class implements parsing of form data for Werkzeug. By itself
it can parse multipart and url encoded form data. It can be subclassed
and extended but for most mimetypes it is a better idea to use the
untouched stream and expose it as separate attributes on a request
object.
.. versionadded:: 0.8
:param stream_factory: An optional callable that returns a new read and
writeable file descriptor. This callable works
the same as :meth:`~BaseResponse._get_file_stream`.
:param charset: The character set for URL and url encoded form data.
:param errors: The encoding error behavior.
:param max_form_memory_size: the maximum number of bytes to be accepted for
in-memory stored form data. If the data
exceeds the value specified an
:exc:`~exceptions.RequestEntityTooLarge`
exception is raised.
:param max_content_length: If this is provided and the transmitted data
is longer than this value an
:exc:`~exceptions.RequestEntityTooLarge`
exception is raised.
:param cls: an optional dict class to use. If this is not specified
or `None` the default :class:`MultiDict` is used.
:param silent: If set to False parsing errors will not be caught.
"""
def __init__(
self,
stream_factory=None,
charset="utf-8",
errors="replace",
max_form_memory_size=None,
max_content_length=None,
cls=None,
silent=True,
):
if stream_factory is None:
stream_factory = default_stream_factory
self.stream_factory = stream_factory
self.charset = charset
self.errors = errors
self.max_form_memory_size = max_form_memory_size
self.max_content_length = max_content_length
if cls is None:
cls = MultiDict
self.cls = cls
self.silent = silent
def get_parse_func(self, mimetype, options):
return self.parse_functions.get(mimetype)
def parse_from_environ(self, environ):
"""Parses the information from the environment as form data.
:param environ: the WSGI environment to be used for parsing.
:return: A tuple in the form ``(stream, form, files)``.
"""
content_type = environ.get("CONTENT_TYPE", "")
content_length = get_content_length(environ)
mimetype, options = parse_options_header(content_type)
return self.parse(get_input_stream(environ), mimetype, content_length, options)
def parse(self, stream, mimetype, content_length, options=None):
"""Parses the information from the given stream, mimetype,
content length and mimetype parameters.
:param stream: an input stream
:param mimetype: the mimetype of the data
:param content_length: the content length of the incoming data
:param options: optional mimetype parameters (used for
the multipart boundary for instance)
:return: A tuple in the form ``(stream, form, files)``.
"""
if (
self.max_content_length is not None
and content_length is not None
and content_length > self.max_content_length
):
raise exceptions.RequestEntityTooLarge()
if options is None:
options = {}
parse_func = self.get_parse_func(mimetype, options)
if parse_func is not None:
try:
return parse_func(self, stream, mimetype, content_length, options)
except ValueError:
if not self.silent:
raise
return stream, self.cls(), self.cls()
@exhaust_stream
def _parse_multipart(self, stream, mimetype, content_length, options):
parser = MultiPartParser(
self.stream_factory,
self.charset,
self.errors,
max_form_memory_size=self.max_form_memory_size,
cls=self.cls,
)
boundary = options.get("boundary")
if boundary is None:
raise ValueError("Missing boundary")
if isinstance(boundary, text_type):
boundary = boundary.encode("ascii")
form, files = parser.parse(stream, boundary, content_length)
return stream, form, files
@exhaust_stream
def _parse_urlencoded(self, stream, mimetype, content_length, options):
if (
self.max_form_memory_size is not None
and content_length is not None
and content_length > self.max_form_memory_size
):
raise exceptions.RequestEntityTooLarge()
form = url_decode_stream(stream, self.charset, errors=self.errors, cls=self.cls)
return stream, form, self.cls()
#: mapping of mimetypes to parsing functions
parse_functions = {
"multipart/form-data": _parse_multipart,
"application/x-www-form-urlencoded": _parse_urlencoded,
"application/x-url-encoded": _parse_urlencoded,
}
def is_valid_multipart_boundary(boundary):
"""Checks if the string given is a valid multipart boundary."""
return _multipart_boundary_re.match(boundary) is not None
def _line_parse(line):
"""Removes line ending characters and returns a tuple (`stripped_line`,
`is_terminated`).
"""
if line[-2:] in ["\r\n", b"\r\n"]:
return line[:-2], True
elif line[-1:] in ["\r", "\n", b"\r", b"\n"]:
return line[:-1], True
return line, False
def parse_multipart_headers(iterable):
"""Parses multipart headers from an iterable that yields lines (including
the trailing newline symbol). The iterable has to be newline terminated.
The iterable will stop at the line where the headers ended so it can be
further consumed.
:param iterable: iterable of strings that are newline terminated
"""
result = []
for line in iterable:
line = to_native(line)
line, line_terminated = _line_parse(line)
if not line_terminated:
raise ValueError("unexpected end of line in multipart header")
if not line:
break
elif line[0] in " \t" and result:
key, value = result[-1]
result[-1] = (key, value + "\n " + line[1:])
else:
parts = line.split(":", 1)
if len(parts) == 2:
result.append((parts[0].strip(), parts[1].strip()))
# we link the list to the headers, no need to create a copy, the
# list was not shared anyways.
return Headers(result)
_begin_form = "begin_form"
_begin_file = "begin_file"
_cont = "cont"
_end = "end"
class MultiPartParser(object):
def __init__(
self,
stream_factory=None,
charset="utf-8",
errors="replace",
max_form_memory_size=None,
cls=None,
buffer_size=64 * 1024,
):
self.charset = charset
self.errors = errors
self.max_form_memory_size = max_form_memory_size
self.stream_factory = (
default_stream_factory if stream_factory is None else stream_factory
)
self.cls = MultiDict if cls is None else cls
# make sure the buffer size is divisible by four so that we can base64
# decode chunk by chunk
assert buffer_size % 4 == 0, "buffer size has to be divisible by 4"
# also the buffer size has to be at least 1024 bytes long or long headers
# will freak out the system
assert buffer_size >= 1024, "buffer size has to be at least 1KB"
self.buffer_size = buffer_size
def _fix_ie_filename(self, filename):
"""Internet Explorer 6 transmits the full file name if a file is
uploaded. This function strips the full path if it thinks the
filename is Windows-like absolute.
"""
if filename[1:3] == ":\\" or filename[:2] == "\\\\":
return filename.split("\\")[-1]
return filename
def _find_terminator(self, iterator):
"""The terminator might have some additional newlines before it.
There is at least one application that sends additional newlines
before headers (the python setuptools package).
"""
for line in iterator:
if not line:
break
line = line.strip()
if line:
return line
return b""
def fail(self, message):
raise ValueError(message)
def get_part_encoding(self, headers):
transfer_encoding = headers.get("content-transfer-encoding")
if (
transfer_encoding is not None
and transfer_encoding in _supported_multipart_encodings
):
return transfer_encoding
def get_part_charset(self, headers):
# Figure out input charset for current part
content_type = headers.get("content-type")
if content_type:
mimetype, ct_params = parse_options_header(content_type)
return ct_params.get("charset", self.charset)
return self.charset
def start_file_streaming(self, filename, headers, total_content_length):
if isinstance(filename, bytes):
filename = filename.decode(self.charset, self.errors)
filename = self._fix_ie_filename(filename)
content_type = headers.get("content-type")
try:
content_length = int(headers["content-length"])
except (KeyError, ValueError):
content_length = 0
container = self.stream_factory(
total_content_length=total_content_length,
filename=filename,
content_type=content_type,
content_length=content_length,
)
return filename, container
def in_memory_threshold_reached(self, bytes):
raise exceptions.RequestEntityTooLarge()
def validate_boundary(self, boundary):
if not boundary:
self.fail("Missing boundary")
if not is_valid_multipart_boundary(boundary):
self.fail("Invalid boundary: %s" % boundary)
if len(boundary) > self.buffer_size: # pragma: no cover
# this should never happen because we check for a minimum size
# of 1024 and boundaries may not be longer than 200. The only
# situation when this happens is for non debug builds where
# the assert is skipped.
self.fail("Boundary longer than buffer size")
def parse_lines(self, file, boundary, content_length, cap_at_buffer=True):
"""Generate parts of
``('begin_form', (headers, name))``
``('begin_file', (headers, name, filename))``
``('cont', bytestring)``
``('end', None)``
Always obeys the grammar
parts = ( begin_form cont* end |
begin_file cont* end )*
"""
next_part = b"--" + boundary
last_part = next_part + b"--"
iterator = chain(
make_line_iter(
file,
limit=content_length,
buffer_size=self.buffer_size,
cap_at_buffer=cap_at_buffer,
),
_empty_string_iter,
)
terminator = self._find_terminator(iterator)
if terminator == last_part:
return
elif terminator != next_part:
self.fail("Expected boundary at start of multipart data")
while terminator != last_part:
headers = parse_multipart_headers(iterator)
disposition = headers.get("content-disposition")
if disposition is None:
self.fail("Missing Content-Disposition header")
disposition, extra = parse_options_header(disposition)
transfer_encoding = self.get_part_encoding(headers)
name = extra.get("name")
filename = extra.get("filename")
# if no content type is given we stream into memory. A list is
# used as a temporary container.
if filename is None:
yield _begin_form, (headers, name)
# otherwise we parse the rest of the headers and ask the stream
# factory for something we can write in.
else:
yield _begin_file, (headers, name, filename)
buf = b""
for line in iterator:
if not line:
self.fail("unexpected end of stream")
if line[:2] == b"--":
terminator = line.rstrip()
if terminator in (next_part, last_part):
break
if transfer_encoding is not None:
if transfer_encoding == "base64":
transfer_encoding = "base64_codec"
try:
line = codecs.decode(line, transfer_encoding)
except Exception:
self.fail("could not decode transfer encoded chunk")
# we have something in the buffer from the last iteration.
# this is usually a newline delimiter.
if buf:
yield _cont, buf
buf = b""
# If the line ends with windows CRLF we write everything except
# the last two bytes. In all other cases however we write
# everything except the last byte. If it was a newline, that's
# fine, otherwise it does not matter because we will write it
# the next iteration. this ensures we do not write the
# final newline into the stream. That way we do not have to
# truncate the stream. However we do have to make sure that
# if something else than a newline is in there we write it
# out.
if line[-2:] == b"\r\n":
buf = b"\r\n"
cutoff = -2
else:
buf = line[-1:]
cutoff = -1
yield _cont, line[:cutoff]
else: # pragma: no cover
raise ValueError("unexpected end of part")
# if we have a leftover in the buffer that is not a newline
# character we have to flush it, otherwise we will chop of
# certain values.
if buf not in (b"", b"\r", b"\n", b"\r\n"):
yield _cont, buf
yield _end, None
def parse_parts(self, file, boundary, content_length):
"""Generate ``('file', (name, val))`` and
``('form', (name, val))`` parts.
"""
in_memory = 0
for ellt, ell in self.parse_lines(file, boundary, content_length):
if ellt == _begin_file:
headers, name, filename = ell
is_file = True
guard_memory = False
filename, container = self.start_file_streaming(
filename, headers, content_length
)
_write = container.write
elif ellt == _begin_form:
headers, name = ell
is_file = False
container = []
_write = container.append
guard_memory = self.max_form_memory_size is not None
elif ellt == _cont:
_write(ell)
# if we write into memory and there is a memory size limit we
# count the number of bytes in memory and raise an exception if
# there is too much data in memory.
if guard_memory:
in_memory += len(ell)
if in_memory > self.max_form_memory_size:
self.in_memory_threshold_reached(in_memory)
elif ellt == _end:
if is_file:
container.seek(0)
yield (
"file",
(name, FileStorage(container, filename, name, headers=headers)),
)
else:
part_charset = self.get_part_charset(headers)
yield (
"form",
(name, b"".join(container).decode(part_charset, self.errors)),
)
def parse(self, file, boundary, content_length):
formstream, filestream = tee(
self.parse_parts(file, boundary, content_length), 2
)
form = (p[1] for p in formstream if p[0] == "form")
files = (p[1] for p in filestream if p[0] == "file")
return self.cls(form), self.cls(files)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/posixemulation.py
|
# -*- coding: utf-8 -*-
r"""
werkzeug.posixemulation
~~~~~~~~~~~~~~~~~~~~~~~
Provides a POSIX emulation for some features that are relevant to
web applications. The main purpose is to simplify support for
systems such as Windows NT that are not 100% POSIX compatible.
Currently this only implements a :func:`rename` function that
follows POSIX semantics. Eg: if the target file already exists it
will be replaced without asking.
This module was introduced in 0.6.1 and is not a public interface.
It might become one in later versions of Werkzeug.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import errno
import os
import random
import sys
import time
from ._compat import to_unicode
from .filesystem import get_filesystem_encoding
can_rename_open_file = False
if os.name == "nt":
try:
import ctypes
_MOVEFILE_REPLACE_EXISTING = 0x1
_MOVEFILE_WRITE_THROUGH = 0x8
_MoveFileEx = ctypes.windll.kernel32.MoveFileExW
def _rename(src, dst):
src = to_unicode(src, get_filesystem_encoding())
dst = to_unicode(dst, get_filesystem_encoding())
if _rename_atomic(src, dst):
return True
retry = 0
rv = False
while not rv and retry < 100:
rv = _MoveFileEx(
src, dst, _MOVEFILE_REPLACE_EXISTING | _MOVEFILE_WRITE_THROUGH
)
if not rv:
time.sleep(0.001)
retry += 1
return rv
# new in Vista and Windows Server 2008
_CreateTransaction = ctypes.windll.ktmw32.CreateTransaction
_CommitTransaction = ctypes.windll.ktmw32.CommitTransaction
_MoveFileTransacted = ctypes.windll.kernel32.MoveFileTransactedW
_CloseHandle = ctypes.windll.kernel32.CloseHandle
can_rename_open_file = True
def _rename_atomic(src, dst):
ta = _CreateTransaction(None, 0, 0, 0, 0, 1000, "Werkzeug rename")
if ta == -1:
return False
try:
retry = 0
rv = False
while not rv and retry < 100:
rv = _MoveFileTransacted(
src,
dst,
None,
None,
_MOVEFILE_REPLACE_EXISTING | _MOVEFILE_WRITE_THROUGH,
ta,
)
if rv:
rv = _CommitTransaction(ta)
break
else:
time.sleep(0.001)
retry += 1
return rv
finally:
_CloseHandle(ta)
except Exception:
def _rename(src, dst):
return False
def _rename_atomic(src, dst):
return False
def rename(src, dst):
# Try atomic or pseudo-atomic rename
if _rename(src, dst):
return
# Fall back to "move away and replace"
try:
os.rename(src, dst)
except OSError as e:
if e.errno != errno.EEXIST:
raise
old = "%s-%08x" % (dst, random.randint(0, sys.maxsize))
os.rename(dst, old)
os.rename(src, dst)
try:
os.unlink(old)
except Exception:
pass
else:
rename = os.rename
can_rename_open_file = True
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/utils.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.utils
~~~~~~~~~~~~~~
This module implements various utilities for WSGI applications. Most of
them are used by the request and response wrappers but especially for
middleware development it makes sense to use them without the wrappers.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import codecs
import os
import pkgutil
import re
import sys
from ._compat import iteritems
from ._compat import PY2
from ._compat import reraise
from ._compat import string_types
from ._compat import text_type
from ._compat import unichr
from ._internal import _DictAccessorProperty
from ._internal import _missing
from ._internal import _parse_signature
try:
from html.entities import name2codepoint
except ImportError:
from htmlentitydefs import name2codepoint
_format_re = re.compile(r"\$(?:(%s)|\{(%s)\})" % (("[a-zA-Z_][a-zA-Z0-9_]*",) * 2))
_entity_re = re.compile(r"&([^;]+);")
_filename_ascii_strip_re = re.compile(r"[^A-Za-z0-9_.-]")
_windows_device_files = (
"CON",
"AUX",
"COM1",
"COM2",
"COM3",
"COM4",
"LPT1",
"LPT2",
"LPT3",
"PRN",
"NUL",
)
class cached_property(property):
"""A decorator that converts a function into a lazy property. The
function wrapped is called the first time to retrieve the result
and then that calculated result is used the next time you access
the value::
class Foo(object):
@cached_property
def foo(self):
# calculate something important here
return 42
The class has to have a `__dict__` in order for this property to
work.
"""
# implementation detail: A subclass of python's builtin property
# decorator, we override __get__ to check for a cached value. If one
# chooses to invoke __get__ by hand the property will still work as
# expected because the lookup logic is replicated in __get__ for
# manual invocation.
def __init__(self, func, name=None, doc=None):
self.__name__ = name or func.__name__
self.__module__ = func.__module__
self.__doc__ = doc or func.__doc__
self.func = func
def __set__(self, obj, value):
obj.__dict__[self.__name__] = value
def __get__(self, obj, type=None):
if obj is None:
return self
value = obj.__dict__.get(self.__name__, _missing)
if value is _missing:
value = self.func(obj)
obj.__dict__[self.__name__] = value
return value
def invalidate_cached_property(obj, name):
"""Invalidates the cache for a :class:`cached_property`:
>>> class Test(object):
... @cached_property
... def magic_number(self):
... print("recalculating...")
... return 42
...
>>> var = Test()
>>> var.magic_number
recalculating...
42
>>> var.magic_number
42
>>> invalidate_cached_property(var, "magic_number")
>>> var.magic_number
recalculating...
42
You must pass the name of the cached property as the second argument.
"""
if not isinstance(getattr(obj.__class__, name, None), cached_property):
raise TypeError(
"Attribute {} of object {} is not a cached_property, "
"cannot be invalidated".format(name, obj)
)
obj.__dict__[name] = _missing
class environ_property(_DictAccessorProperty):
"""Maps request attributes to environment variables. This works not only
for the Werzeug request object, but also any other class with an
environ attribute:
>>> class Test(object):
... environ = {'key': 'value'}
... test = environ_property('key')
>>> var = Test()
>>> var.test
'value'
If you pass it a second value it's used as default if the key does not
exist, the third one can be a converter that takes a value and converts
it. If it raises :exc:`ValueError` or :exc:`TypeError` the default value
is used. If no default value is provided `None` is used.
Per default the property is read only. You have to explicitly enable it
by passing ``read_only=False`` to the constructor.
"""
read_only = True
def lookup(self, obj):
return obj.environ
class header_property(_DictAccessorProperty):
"""Like `environ_property` but for headers."""
def lookup(self, obj):
return obj.headers
class HTMLBuilder(object):
"""Helper object for HTML generation.
Per default there are two instances of that class. The `html` one, and
the `xhtml` one for those two dialects. The class uses keyword parameters
and positional parameters to generate small snippets of HTML.
Keyword parameters are converted to XML/SGML attributes, positional
arguments are used as children. Because Python accepts positional
arguments before keyword arguments it's a good idea to use a list with the
star-syntax for some children:
>>> html.p(class_='foo', *[html.a('foo', href='foo.html'), ' ',
... html.a('bar', href='bar.html')])
u'<p class="foo"><a href="foo.html">foo</a> <a href="bar.html">bar</a></p>'
This class works around some browser limitations and can not be used for
arbitrary SGML/XML generation. For that purpose lxml and similar
libraries exist.
Calling the builder escapes the string passed:
>>> html.p(html("<foo>"))
u'<p><foo></p>'
"""
_entity_re = re.compile(r"&([^;]+);")
_entities = name2codepoint.copy()
_entities["apos"] = 39
_empty_elements = {
"area",
"base",
"basefont",
"br",
"col",
"command",
"embed",
"frame",
"hr",
"img",
"input",
"keygen",
"isindex",
"link",
"meta",
"param",
"source",
"wbr",
}
_boolean_attributes = {
"selected",
"checked",
"compact",
"declare",
"defer",
"disabled",
"ismap",
"multiple",
"nohref",
"noresize",
"noshade",
"nowrap",
}
_plaintext_elements = {"textarea"}
_c_like_cdata = {"script", "style"}
def __init__(self, dialect):
self._dialect = dialect
def __call__(self, s):
return escape(s)
def __getattr__(self, tag):
if tag[:2] == "__":
raise AttributeError(tag)
def proxy(*children, **arguments):
buffer = "<" + tag
for key, value in iteritems(arguments):
if value is None:
continue
if key[-1] == "_":
key = key[:-1]
if key in self._boolean_attributes:
if not value:
continue
if self._dialect == "xhtml":
value = '="' + key + '"'
else:
value = ""
else:
value = '="' + escape(value) + '"'
buffer += " " + key + value
if not children and tag in self._empty_elements:
if self._dialect == "xhtml":
buffer += " />"
else:
buffer += ">"
return buffer
buffer += ">"
children_as_string = "".join(
[text_type(x) for x in children if x is not None]
)
if children_as_string:
if tag in self._plaintext_elements:
children_as_string = escape(children_as_string)
elif tag in self._c_like_cdata and self._dialect == "xhtml":
children_as_string = (
"/*<![CDATA[*/" + children_as_string + "/*]]>*/"
)
buffer += children_as_string + "</" + tag + ">"
return buffer
return proxy
def __repr__(self):
return "<%s for %r>" % (self.__class__.__name__, self._dialect)
html = HTMLBuilder("html")
xhtml = HTMLBuilder("xhtml")
# https://cgit.freedesktop.org/xdg/shared-mime-info/tree/freedesktop.org.xml.in
# https://www.iana.org/assignments/media-types/media-types.xhtml
# Types listed in the XDG mime info that have a charset in the IANA registration.
_charset_mimetypes = {
"application/ecmascript",
"application/javascript",
"application/sql",
"application/xml",
"application/xml-dtd",
"application/xml-external-parsed-entity",
}
def get_content_type(mimetype, charset):
"""Returns the full content type string with charset for a mimetype.
If the mimetype represents text, the charset parameter will be
appended, otherwise the mimetype is returned unchanged.
:param mimetype: The mimetype to be used as content type.
:param charset: The charset to be appended for text mimetypes.
:return: The content type.
.. versionchanged:: 0.15
Any type that ends with ``+xml`` gets a charset, not just those
that start with ``application/``. Known text types such as
``application/javascript`` are also given charsets.
"""
if (
mimetype.startswith("text/")
or mimetype in _charset_mimetypes
or mimetype.endswith("+xml")
):
mimetype += "; charset=" + charset
return mimetype
def detect_utf_encoding(data):
"""Detect which UTF encoding was used to encode the given bytes.
The latest JSON standard (:rfc:`8259`) suggests that only UTF-8 is
accepted. Older documents allowed 8, 16, or 32. 16 and 32 can be big
or little endian. Some editors or libraries may prepend a BOM.
:internal:
:param data: Bytes in unknown UTF encoding.
:return: UTF encoding name
.. versionadded:: 0.15
"""
head = data[:4]
if head[:3] == codecs.BOM_UTF8:
return "utf-8-sig"
if b"\x00" not in head:
return "utf-8"
if head in (codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE):
return "utf-32"
if head[:2] in (codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE):
return "utf-16"
if len(head) == 4:
if head[:3] == b"\x00\x00\x00":
return "utf-32-be"
if head[::2] == b"\x00\x00":
return "utf-16-be"
if head[1:] == b"\x00\x00\x00":
return "utf-32-le"
if head[1::2] == b"\x00\x00":
return "utf-16-le"
if len(head) == 2:
return "utf-16-be" if head.startswith(b"\x00") else "utf-16-le"
return "utf-8"
def format_string(string, context):
"""String-template format a string:
>>> format_string('$foo and ${foo}s', dict(foo=42))
'42 and 42s'
This does not do any attribute lookup etc. For more advanced string
formattings have a look at the `werkzeug.template` module.
:param string: the format string.
:param context: a dict with the variables to insert.
"""
def lookup_arg(match):
x = context[match.group(1) or match.group(2)]
if not isinstance(x, string_types):
x = type(string)(x)
return x
return _format_re.sub(lookup_arg, string)
def secure_filename(filename):
r"""Pass it a filename and it will return a secure version of it. This
filename can then safely be stored on a regular file system and passed
to :func:`os.path.join`. The filename returned is an ASCII only string
for maximum portability.
On windows systems the function also makes sure that the file is not
named after one of the special device files.
>>> secure_filename("My cool movie.mov")
'My_cool_movie.mov'
>>> secure_filename("../../../etc/passwd")
'etc_passwd'
>>> secure_filename(u'i contain cool \xfcml\xe4uts.txt')
'i_contain_cool_umlauts.txt'
The function might return an empty filename. It's your responsibility
to ensure that the filename is unique and that you abort or
generate a random filename if the function returned an empty one.
.. versionadded:: 0.5
:param filename: the filename to secure
"""
if isinstance(filename, text_type):
from unicodedata import normalize
filename = normalize("NFKD", filename).encode("ascii", "ignore")
if not PY2:
filename = filename.decode("ascii")
for sep in os.path.sep, os.path.altsep:
if sep:
filename = filename.replace(sep, " ")
filename = str(_filename_ascii_strip_re.sub("", "_".join(filename.split()))).strip(
"._"
)
# on nt a couple of special files are present in each folder. We
# have to ensure that the target file is not such a filename. In
# this case we prepend an underline
if (
os.name == "nt"
and filename
and filename.split(".")[0].upper() in _windows_device_files
):
filename = "_" + filename
return filename
def escape(s):
"""Replace special characters "&", "<", ">" and (") to HTML-safe sequences.
There is a special handling for `None` which escapes to an empty string.
.. versionchanged:: 0.9
`quote` is now implicitly on.
:param s: the string to escape.
:param quote: ignored.
"""
if s is None:
return ""
elif hasattr(s, "__html__"):
return text_type(s.__html__())
if not isinstance(s, string_types):
s = text_type(s)
return (
s.replace("&", "&")
.replace("<", "<")
.replace(">", ">")
.replace('"', """)
)
def unescape(s):
"""The reverse function of `escape`. This unescapes all the HTML
entities, not only the XML entities inserted by `escape`.
:param s: the string to unescape.
"""
def handle_match(m):
name = m.group(1)
if name in HTMLBuilder._entities:
return unichr(HTMLBuilder._entities[name])
try:
if name[:2] in ("#x", "#X"):
return unichr(int(name[2:], 16))
elif name.startswith("#"):
return unichr(int(name[1:]))
except ValueError:
pass
return u""
return _entity_re.sub(handle_match, s)
def redirect(location, code=302, Response=None):
"""Returns a response object (a WSGI application) that, if called,
redirects the client to the target location. Supported codes are
301, 302, 303, 305, 307, and 308. 300 is not supported because
it's not a real redirect and 304 because it's the answer for a
request with a request with defined If-Modified-Since headers.
.. versionadded:: 0.6
The location can now be a unicode string that is encoded using
the :func:`iri_to_uri` function.
.. versionadded:: 0.10
The class used for the Response object can now be passed in.
:param location: the location the response should redirect to.
:param code: the redirect status code. defaults to 302.
:param class Response: a Response class to use when instantiating a
response. The default is :class:`werkzeug.wrappers.Response` if
unspecified.
"""
if Response is None:
from .wrappers import Response
display_location = escape(location)
if isinstance(location, text_type):
# Safe conversion is necessary here as we might redirect
# to a broken URI scheme (for instance itms-services).
from .urls import iri_to_uri
location = iri_to_uri(location, safe_conversion=True)
response = Response(
'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
"<title>Redirecting...</title>\n"
"<h1>Redirecting...</h1>\n"
"<p>You should be redirected automatically to target URL: "
'<a href="%s">%s</a>. If not click the link.'
% (escape(location), display_location),
code,
mimetype="text/html",
)
response.headers["Location"] = location
return response
def append_slash_redirect(environ, code=301):
"""Redirects to the same URL but with a slash appended. The behavior
of this function is undefined if the path ends with a slash already.
:param environ: the WSGI environment for the request that triggers
the redirect.
:param code: the status code for the redirect.
"""
new_path = environ["PATH_INFO"].strip("/") + "/"
query_string = environ.get("QUERY_STRING")
if query_string:
new_path += "?" + query_string
return redirect(new_path, code)
def import_string(import_name, silent=False):
"""Imports an object based on a string. This is useful if you want to
use import paths as endpoints or something similar. An import path can
be specified either in dotted notation (``xml.sax.saxutils.escape``)
or with a colon as object delimiter (``xml.sax.saxutils:escape``).
If `silent` is True the return value will be `None` if the import fails.
:param import_name: the dotted name for the object to import.
:param silent: if set to `True` import errors are ignored and
`None` is returned instead.
:return: imported object
"""
# force the import name to automatically convert to strings
# __import__ is not able to handle unicode strings in the fromlist
# if the module is a package
import_name = str(import_name).replace(":", ".")
try:
try:
__import__(import_name)
except ImportError:
if "." not in import_name:
raise
else:
return sys.modules[import_name]
module_name, obj_name = import_name.rsplit(".", 1)
module = __import__(module_name, globals(), locals(), [obj_name])
try:
return getattr(module, obj_name)
except AttributeError as e:
raise ImportError(e)
except ImportError as e:
if not silent:
reraise(
ImportStringError, ImportStringError(import_name, e), sys.exc_info()[2]
)
def find_modules(import_path, include_packages=False, recursive=False):
"""Finds all the modules below a package. This can be useful to
automatically import all views / controllers so that their metaclasses /
function decorators have a chance to register themselves on the
application.
Packages are not returned unless `include_packages` is `True`. This can
also recursively list modules but in that case it will import all the
packages to get the correct load path of that module.
:param import_path: the dotted name for the package to find child modules.
:param include_packages: set to `True` if packages should be returned, too.
:param recursive: set to `True` if recursion should happen.
:return: generator
"""
module = import_string(import_path)
path = getattr(module, "__path__", None)
if path is None:
raise ValueError("%r is not a package" % import_path)
basename = module.__name__ + "."
for _importer, modname, ispkg in pkgutil.iter_modules(path):
modname = basename + modname
if ispkg:
if include_packages:
yield modname
if recursive:
for item in find_modules(modname, include_packages, True):
yield item
else:
yield modname
def validate_arguments(func, args, kwargs, drop_extra=True):
"""Checks if the function accepts the arguments and keyword arguments.
Returns a new ``(args, kwargs)`` tuple that can safely be passed to
the function without causing a `TypeError` because the function signature
is incompatible. If `drop_extra` is set to `True` (which is the default)
any extra positional or keyword arguments are dropped automatically.
The exception raised provides three attributes:
`missing`
A set of argument names that the function expected but where
missing.
`extra`
A dict of keyword arguments that the function can not handle but
where provided.
`extra_positional`
A list of values that where given by positional argument but the
function cannot accept.
This can be useful for decorators that forward user submitted data to
a view function::
from werkzeug.utils import ArgumentValidationError, validate_arguments
def sanitize(f):
def proxy(request):
data = request.values.to_dict()
try:
args, kwargs = validate_arguments(f, (request,), data)
except ArgumentValidationError:
raise BadRequest('The browser failed to transmit all '
'the data expected.')
return f(*args, **kwargs)
return proxy
:param func: the function the validation is performed against.
:param args: a tuple of positional arguments.
:param kwargs: a dict of keyword arguments.
:param drop_extra: set to `False` if you don't want extra arguments
to be silently dropped.
:return: tuple in the form ``(args, kwargs)``.
"""
parser = _parse_signature(func)
args, kwargs, missing, extra, extra_positional = parser(args, kwargs)[:5]
if missing:
raise ArgumentValidationError(tuple(missing))
elif (extra or extra_positional) and not drop_extra:
raise ArgumentValidationError(None, extra, extra_positional)
return tuple(args), kwargs
def bind_arguments(func, args, kwargs):
"""Bind the arguments provided into a dict. When passed a function,
a tuple of arguments and a dict of keyword arguments `bind_arguments`
returns a dict of names as the function would see it. This can be useful
to implement a cache decorator that uses the function arguments to build
the cache key based on the values of the arguments.
:param func: the function the arguments should be bound for.
:param args: tuple of positional arguments.
:param kwargs: a dict of keyword arguments.
:return: a :class:`dict` of bound keyword arguments.
"""
(
args,
kwargs,
missing,
extra,
extra_positional,
arg_spec,
vararg_var,
kwarg_var,
) = _parse_signature(func)(args, kwargs)
values = {}
for (name, _has_default, _default), value in zip(arg_spec, args):
values[name] = value
if vararg_var is not None:
values[vararg_var] = tuple(extra_positional)
elif extra_positional:
raise TypeError("too many positional arguments")
if kwarg_var is not None:
multikw = set(extra) & set([x[0] for x in arg_spec])
if multikw:
raise TypeError(
"got multiple values for keyword argument " + repr(next(iter(multikw)))
)
values[kwarg_var] = extra
elif extra:
raise TypeError("got unexpected keyword argument " + repr(next(iter(extra))))
return values
class ArgumentValidationError(ValueError):
"""Raised if :func:`validate_arguments` fails to validate"""
def __init__(self, missing=None, extra=None, extra_positional=None):
self.missing = set(missing or ())
self.extra = extra or {}
self.extra_positional = extra_positional or []
ValueError.__init__(
self,
"function arguments invalid. (%d missing, %d additional)"
% (len(self.missing), len(self.extra) + len(self.extra_positional)),
)
class ImportStringError(ImportError):
"""Provides information about a failed :func:`import_string` attempt."""
#: String in dotted notation that failed to be imported.
import_name = None
#: Wrapped exception.
exception = None
def __init__(self, import_name, exception):
self.import_name = import_name
self.exception = exception
msg = (
"import_string() failed for %r. Possible reasons are:\n\n"
"- missing __init__.py in a package;\n"
"- package or module path not included in sys.path;\n"
"- duplicated package or module name taking precedence in "
"sys.path;\n"
"- missing module, class, function or variable;\n\n"
"Debugged import:\n\n%s\n\n"
"Original exception:\n\n%s: %s"
)
name = ""
tracked = []
for part in import_name.replace(":", ".").split("."):
name += (name and ".") + part
imported = import_string(name, silent=True)
if imported:
tracked.append((name, getattr(imported, "__file__", None)))
else:
track = ["- %r found in %r." % (n, i) for n, i in tracked]
track.append("- %r not found." % name)
msg = msg % (
import_name,
"\n".join(track),
exception.__class__.__name__,
str(exception),
)
break
ImportError.__init__(self, msg)
def __repr__(self):
return "<%s(%r, %r)>" % (
self.__class__.__name__,
self.import_name,
self.exception,
)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/routing.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.routing
~~~~~~~~~~~~~~~~
When it comes to combining multiple controller or view functions (however
you want to call them) you need a dispatcher. A simple way would be
applying regular expression tests on the ``PATH_INFO`` and calling
registered callback functions that return the value then.
This module implements a much more powerful system than simple regular
expression matching because it can also convert values in the URLs and
build URLs.
Here a simple example that creates an URL map for an application with
two subdomains (www and kb) and some URL rules:
>>> m = Map([
... # Static URLs
... Rule('/', endpoint='static/index'),
... Rule('/about', endpoint='static/about'),
... Rule('/help', endpoint='static/help'),
... # Knowledge Base
... Subdomain('kb', [
... Rule('/', endpoint='kb/index'),
... Rule('/browse/', endpoint='kb/browse'),
... Rule('/browse/<int:id>/', endpoint='kb/browse'),
... Rule('/browse/<int:id>/<int:page>', endpoint='kb/browse')
... ])
... ], default_subdomain='www')
If the application doesn't use subdomains it's perfectly fine to not set
the default subdomain and not use the `Subdomain` rule factory. The endpoint
in the rules can be anything, for example import paths or unique
identifiers. The WSGI application can use those endpoints to get the
handler for that URL. It doesn't have to be a string at all but it's
recommended.
Now it's possible to create a URL adapter for one of the subdomains and
build URLs:
>>> c = m.bind('example.com')
>>> c.build("kb/browse", dict(id=42))
'http://kb.example.com/browse/42/'
>>> c.build("kb/browse", dict())
'http://kb.example.com/browse/'
>>> c.build("kb/browse", dict(id=42, page=3))
'http://kb.example.com/browse/42/3'
>>> c.build("static/about")
'/about'
>>> c.build("static/index", force_external=True)
'http://www.example.com/'
>>> c = m.bind('example.com', subdomain='kb')
>>> c.build("static/about")
'http://www.example.com/about'
The first argument to bind is the server name *without* the subdomain.
Per default it will assume that the script is mounted on the root, but
often that's not the case so you can provide the real mount point as
second argument:
>>> c = m.bind('example.com', '/applications/example')
The third argument can be the subdomain, if not given the default
subdomain is used. For more details about binding have a look at the
documentation of the `MapAdapter`.
And here is how you can match URLs:
>>> c = m.bind('example.com')
>>> c.match("/")
('static/index', {})
>>> c.match("/about")
('static/about', {})
>>> c = m.bind('example.com', '/', 'kb')
>>> c.match("/")
('kb/index', {})
>>> c.match("/browse/42/23")
('kb/browse', {'id': 42, 'page': 23})
If matching fails you get a `NotFound` exception, if the rule thinks
it's a good idea to redirect (for example because the URL was defined
to have a slash at the end but the request was missing that slash) it
will raise a `RequestRedirect` exception. Both are subclasses of the
`HTTPException` so you can use those errors as responses in the
application.
If matching succeeded but the URL rule was incompatible to the given
method (for example there were only rules for `GET` and `HEAD` and
routing system tried to match a `POST` request) a `MethodNotAllowed`
exception is raised.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import ast
import difflib
import posixpath
import re
import uuid
import warnings
from pprint import pformat
from threading import Lock
from ._compat import implements_to_string
from ._compat import iteritems
from ._compat import itervalues
from ._compat import native_string_result
from ._compat import string_types
from ._compat import text_type
from ._compat import to_bytes
from ._compat import to_unicode
from ._compat import wsgi_decoding_dance
from ._internal import _encode_idna
from ._internal import _get_environ
from .datastructures import ImmutableDict
from .datastructures import MultiDict
from .exceptions import BadHost
from .exceptions import BadRequest
from .exceptions import HTTPException
from .exceptions import MethodNotAllowed
from .exceptions import NotFound
from .urls import _fast_url_quote
from .urls import url_encode
from .urls import url_join
from .urls import url_quote
from .utils import cached_property
from .utils import format_string
from .utils import redirect
from .wsgi import get_host
_rule_re = re.compile(
r"""
(?P<static>[^<]*) # static rule data
<
(?:
(?P<converter>[a-zA-Z_][a-zA-Z0-9_]*) # converter name
(?:\((?P<args>.*?)\))? # converter arguments
\: # variable delimiter
)?
(?P<variable>[a-zA-Z_][a-zA-Z0-9_]*) # variable name
>
""",
re.VERBOSE,
)
_simple_rule_re = re.compile(r"<([^>]+)>")
_converter_args_re = re.compile(
r"""
((?P<name>\w+)\s*=\s*)?
(?P<value>
True|False|
\d+.\d+|
\d+.|
\d+|
[\w\d_.]+|
[urUR]?(?P<stringval>"[^"]*?"|'[^']*')
)\s*,
""",
re.VERBOSE | re.UNICODE,
)
_PYTHON_CONSTANTS = {"None": None, "True": True, "False": False}
def _pythonize(value):
if value in _PYTHON_CONSTANTS:
return _PYTHON_CONSTANTS[value]
for convert in int, float:
try:
return convert(value)
except ValueError:
pass
if value[:1] == value[-1:] and value[0] in "\"'":
value = value[1:-1]
return text_type(value)
def parse_converter_args(argstr):
argstr += ","
args = []
kwargs = {}
for item in _converter_args_re.finditer(argstr):
value = item.group("stringval")
if value is None:
value = item.group("value")
value = _pythonize(value)
if not item.group("name"):
args.append(value)
else:
name = item.group("name")
kwargs[name] = value
return tuple(args), kwargs
def parse_rule(rule):
"""Parse a rule and return it as generator. Each iteration yields tuples
in the form ``(converter, arguments, variable)``. If the converter is
`None` it's a static url part, otherwise it's a dynamic one.
:internal:
"""
pos = 0
end = len(rule)
do_match = _rule_re.match
used_names = set()
while pos < end:
m = do_match(rule, pos)
if m is None:
break
data = m.groupdict()
if data["static"]:
yield None, None, data["static"]
variable = data["variable"]
converter = data["converter"] or "default"
if variable in used_names:
raise ValueError("variable name %r used twice." % variable)
used_names.add(variable)
yield converter, data["args"] or None, variable
pos = m.end()
if pos < end:
remaining = rule[pos:]
if ">" in remaining or "<" in remaining:
raise ValueError("malformed url rule: %r" % rule)
yield None, None, remaining
class RoutingException(Exception):
"""Special exceptions that require the application to redirect, notifying
about missing urls, etc.
:internal:
"""
class RequestRedirect(HTTPException, RoutingException):
"""Raise if the map requests a redirect. This is for example the case if
`strict_slashes` are activated and an url that requires a trailing slash.
The attribute `new_url` contains the absolute destination url.
"""
code = 308
def __init__(self, new_url):
RoutingException.__init__(self, new_url)
self.new_url = new_url
def get_response(self, environ=None):
return redirect(self.new_url, self.code)
class RequestPath(RoutingException):
"""Internal exception."""
__slots__ = ("path_info",)
def __init__(self, path_info):
self.path_info = path_info
class RequestAliasRedirect(RoutingException): # noqa: B903
"""This rule is an alias and wants to redirect to the canonical URL."""
def __init__(self, matched_values):
self.matched_values = matched_values
@implements_to_string
class BuildError(RoutingException, LookupError):
"""Raised if the build system cannot find a URL for an endpoint with the
values provided.
"""
def __init__(self, endpoint, values, method, adapter=None):
LookupError.__init__(self, endpoint, values, method)
self.endpoint = endpoint
self.values = values
self.method = method
self.adapter = adapter
@cached_property
def suggested(self):
return self.closest_rule(self.adapter)
def closest_rule(self, adapter):
def _score_rule(rule):
return sum(
[
0.98
* difflib.SequenceMatcher(
None, rule.endpoint, self.endpoint
).ratio(),
0.01 * bool(set(self.values or ()).issubset(rule.arguments)),
0.01 * bool(rule.methods and self.method in rule.methods),
]
)
if adapter and adapter.map._rules:
return max(adapter.map._rules, key=_score_rule)
def __str__(self):
message = []
message.append("Could not build url for endpoint %r" % self.endpoint)
if self.method:
message.append(" (%r)" % self.method)
if self.values:
message.append(" with values %r" % sorted(self.values.keys()))
message.append(".")
if self.suggested:
if self.endpoint == self.suggested.endpoint:
if self.method and self.method not in self.suggested.methods:
message.append(
" Did you mean to use methods %r?"
% sorted(self.suggested.methods)
)
missing_values = self.suggested.arguments.union(
set(self.suggested.defaults or ())
) - set(self.values.keys())
if missing_values:
message.append(
" Did you forget to specify values %r?" % sorted(missing_values)
)
else:
message.append(" Did you mean %r instead?" % self.suggested.endpoint)
return u"".join(message)
class WebsocketMismatch(BadRequest):
"""The only matched rule is either a WebSocket and the request is
HTTP, or the rule is HTTP and the request is a WebSocket.
"""
class ValidationError(ValueError):
"""Validation error. If a rule converter raises this exception the rule
does not match the current URL and the next URL is tried.
"""
class RuleFactory(object):
"""As soon as you have more complex URL setups it's a good idea to use rule
factories to avoid repetitive tasks. Some of them are builtin, others can
be added by subclassing `RuleFactory` and overriding `get_rules`.
"""
def get_rules(self, map):
"""Subclasses of `RuleFactory` have to override this method and return
an iterable of rules."""
raise NotImplementedError()
class Subdomain(RuleFactory):
"""All URLs provided by this factory have the subdomain set to a
specific domain. For example if you want to use the subdomain for
the current language this can be a good setup::
url_map = Map([
Rule('/', endpoint='#select_language'),
Subdomain('<string(length=2):lang_code>', [
Rule('/', endpoint='index'),
Rule('/about', endpoint='about'),
Rule('/help', endpoint='help')
])
])
All the rules except for the ``'#select_language'`` endpoint will now
listen on a two letter long subdomain that holds the language code
for the current request.
"""
def __init__(self, subdomain, rules):
self.subdomain = subdomain
self.rules = rules
def get_rules(self, map):
for rulefactory in self.rules:
for rule in rulefactory.get_rules(map):
rule = rule.empty()
rule.subdomain = self.subdomain
yield rule
class Submount(RuleFactory):
"""Like `Subdomain` but prefixes the URL rule with a given string::
url_map = Map([
Rule('/', endpoint='index'),
Submount('/blog', [
Rule('/', endpoint='blog/index'),
Rule('/entry/<entry_slug>', endpoint='blog/show')
])
])
Now the rule ``'blog/show'`` matches ``/blog/entry/<entry_slug>``.
"""
def __init__(self, path, rules):
self.path = path.rstrip("/")
self.rules = rules
def get_rules(self, map):
for rulefactory in self.rules:
for rule in rulefactory.get_rules(map):
rule = rule.empty()
rule.rule = self.path + rule.rule
yield rule
class EndpointPrefix(RuleFactory):
"""Prefixes all endpoints (which must be strings for this factory) with
another string. This can be useful for sub applications::
url_map = Map([
Rule('/', endpoint='index'),
EndpointPrefix('blog/', [Submount('/blog', [
Rule('/', endpoint='index'),
Rule('/entry/<entry_slug>', endpoint='show')
])])
])
"""
def __init__(self, prefix, rules):
self.prefix = prefix
self.rules = rules
def get_rules(self, map):
for rulefactory in self.rules:
for rule in rulefactory.get_rules(map):
rule = rule.empty()
rule.endpoint = self.prefix + rule.endpoint
yield rule
class RuleTemplate(object):
"""Returns copies of the rules wrapped and expands string templates in
the endpoint, rule, defaults or subdomain sections.
Here a small example for such a rule template::
from werkzeug.routing import Map, Rule, RuleTemplate
resource = RuleTemplate([
Rule('/$name/', endpoint='$name.list'),
Rule('/$name/<int:id>', endpoint='$name.show')
])
url_map = Map([resource(name='user'), resource(name='page')])
When a rule template is called the keyword arguments are used to
replace the placeholders in all the string parameters.
"""
def __init__(self, rules):
self.rules = list(rules)
def __call__(self, *args, **kwargs):
return RuleTemplateFactory(self.rules, dict(*args, **kwargs))
class RuleTemplateFactory(RuleFactory):
"""A factory that fills in template variables into rules. Used by
`RuleTemplate` internally.
:internal:
"""
def __init__(self, rules, context):
self.rules = rules
self.context = context
def get_rules(self, map):
for rulefactory in self.rules:
for rule in rulefactory.get_rules(map):
new_defaults = subdomain = None
if rule.defaults:
new_defaults = {}
for key, value in iteritems(rule.defaults):
if isinstance(value, string_types):
value = format_string(value, self.context)
new_defaults[key] = value
if rule.subdomain is not None:
subdomain = format_string(rule.subdomain, self.context)
new_endpoint = rule.endpoint
if isinstance(new_endpoint, string_types):
new_endpoint = format_string(new_endpoint, self.context)
yield Rule(
format_string(rule.rule, self.context),
new_defaults,
subdomain,
rule.methods,
rule.build_only,
new_endpoint,
rule.strict_slashes,
)
def _prefix_names(src):
"""ast parse and prefix names with `.` to avoid collision with user vars"""
tree = ast.parse(src).body[0]
if isinstance(tree, ast.Expr):
tree = tree.value
for node in ast.walk(tree):
if isinstance(node, ast.Name):
node.id = "." + node.id
return tree
_CALL_CONVERTER_CODE_FMT = "self._converters[{elem!r}].to_url()"
_IF_KWARGS_URL_ENCODE_CODE = """\
if kwargs:
q = '?'
params = self._encode_query_vars(kwargs)
else:
q = params = ''
"""
_IF_KWARGS_URL_ENCODE_AST = _prefix_names(_IF_KWARGS_URL_ENCODE_CODE)
_URL_ENCODE_AST_NAMES = (_prefix_names("q"), _prefix_names("params"))
@implements_to_string
class Rule(RuleFactory):
"""A Rule represents one URL pattern. There are some options for `Rule`
that change the way it behaves and are passed to the `Rule` constructor.
Note that besides the rule-string all arguments *must* be keyword arguments
in order to not break the application on Werkzeug upgrades.
`string`
Rule strings basically are just normal URL paths with placeholders in
the format ``<converter(arguments):name>`` where the converter and the
arguments are optional. If no converter is defined the `default`
converter is used which means `string` in the normal configuration.
URL rules that end with a slash are branch URLs, others are leaves.
If you have `strict_slashes` enabled (which is the default), all
branch URLs that are matched without a trailing slash will trigger a
redirect to the same URL with the missing slash appended.
The converters are defined on the `Map`.
`endpoint`
The endpoint for this rule. This can be anything. A reference to a
function, a string, a number etc. The preferred way is using a string
because the endpoint is used for URL generation.
`defaults`
An optional dict with defaults for other rules with the same endpoint.
This is a bit tricky but useful if you want to have unique URLs::
url_map = Map([
Rule('/all/', defaults={'page': 1}, endpoint='all_entries'),
Rule('/all/page/<int:page>', endpoint='all_entries')
])
If a user now visits ``http://example.com/all/page/1`` he will be
redirected to ``http://example.com/all/``. If `redirect_defaults` is
disabled on the `Map` instance this will only affect the URL
generation.
`subdomain`
The subdomain rule string for this rule. If not specified the rule
only matches for the `default_subdomain` of the map. If the map is
not bound to a subdomain this feature is disabled.
Can be useful if you want to have user profiles on different subdomains
and all subdomains are forwarded to your application::
url_map = Map([
Rule('/', subdomain='<username>', endpoint='user/homepage'),
Rule('/stats', subdomain='<username>', endpoint='user/stats')
])
`methods`
A sequence of http methods this rule applies to. If not specified, all
methods are allowed. For example this can be useful if you want different
endpoints for `POST` and `GET`. If methods are defined and the path
matches but the method matched against is not in this list or in the
list of another rule for that path the error raised is of the type
`MethodNotAllowed` rather than `NotFound`. If `GET` is present in the
list of methods and `HEAD` is not, `HEAD` is added automatically.
`strict_slashes`
Override the `Map` setting for `strict_slashes` only for this rule. If
not specified the `Map` setting is used.
`merge_slashes`
Override :attr:`Map.merge_slashes` for this rule.
`build_only`
Set this to True and the rule will never match but will create a URL
that can be build. This is useful if you have resources on a subdomain
or folder that are not handled by the WSGI application (like static data)
`redirect_to`
If given this must be either a string or callable. In case of a
callable it's called with the url adapter that triggered the match and
the values of the URL as keyword arguments and has to return the target
for the redirect, otherwise it has to be a string with placeholders in
rule syntax::
def foo_with_slug(adapter, id):
# ask the database for the slug for the old id. this of
# course has nothing to do with werkzeug.
return 'foo/' + Foo.get_slug_for_id(id)
url_map = Map([
Rule('/foo/<slug>', endpoint='foo'),
Rule('/some/old/url/<slug>', redirect_to='foo/<slug>'),
Rule('/other/old/url/<int:id>', redirect_to=foo_with_slug)
])
When the rule is matched the routing system will raise a
`RequestRedirect` exception with the target for the redirect.
Keep in mind that the URL will be joined against the URL root of the
script so don't use a leading slash on the target URL unless you
really mean root of that domain.
`alias`
If enabled this rule serves as an alias for another rule with the same
endpoint and arguments.
`host`
If provided and the URL map has host matching enabled this can be
used to provide a match rule for the whole host. This also means
that the subdomain feature is disabled.
`websocket`
If ``True``, this rule is only matches for WebSocket (``ws://``,
``wss://``) requests. By default, rules will only match for HTTP
requests.
.. versionadded:: 1.0
Added ``websocket``.
.. versionadded:: 1.0
Added ``merge_slashes``.
.. versionadded:: 0.7
Added ``alias`` and ``host``.
.. versionchanged:: 0.6.1
``HEAD`` is added to ``methods`` if ``GET`` is present.
"""
def __init__(
self,
string,
defaults=None,
subdomain=None,
methods=None,
build_only=False,
endpoint=None,
strict_slashes=None,
merge_slashes=None,
redirect_to=None,
alias=False,
host=None,
websocket=False,
):
if not string.startswith("/"):
raise ValueError("urls must start with a leading slash")
self.rule = string
self.is_leaf = not string.endswith("/")
self.map = None
self.strict_slashes = strict_slashes
self.merge_slashes = merge_slashes
self.subdomain = subdomain
self.host = host
self.defaults = defaults
self.build_only = build_only
self.alias = alias
self.websocket = websocket
if methods is not None:
if isinstance(methods, str):
raise TypeError("'methods' should be a list of strings.")
methods = {x.upper() for x in methods}
if "HEAD" not in methods and "GET" in methods:
methods.add("HEAD")
if websocket and methods - {"GET", "HEAD", "OPTIONS"}:
raise ValueError(
"WebSocket rules can only use 'GET', 'HEAD', and 'OPTIONS' methods."
)
self.methods = methods
self.endpoint = endpoint
self.redirect_to = redirect_to
if defaults:
self.arguments = set(map(str, defaults))
else:
self.arguments = set()
self._trace = self._converters = self._regex = self._argument_weights = None
def empty(self):
"""
Return an unbound copy of this rule.
This can be useful if want to reuse an already bound URL for another
map. See ``get_empty_kwargs`` to override what keyword arguments are
provided to the new copy.
"""
return type(self)(self.rule, **self.get_empty_kwargs())
def get_empty_kwargs(self):
"""
Provides kwargs for instantiating empty copy with empty()
Use this method to provide custom keyword arguments to the subclass of
``Rule`` when calling ``some_rule.empty()``. Helpful when the subclass
has custom keyword arguments that are needed at instantiation.
Must return a ``dict`` that will be provided as kwargs to the new
instance of ``Rule``, following the initial ``self.rule`` value which
is always provided as the first, required positional argument.
"""
defaults = None
if self.defaults:
defaults = dict(self.defaults)
return dict(
defaults=defaults,
subdomain=self.subdomain,
methods=self.methods,
build_only=self.build_only,
endpoint=self.endpoint,
strict_slashes=self.strict_slashes,
redirect_to=self.redirect_to,
alias=self.alias,
host=self.host,
)
def get_rules(self, map):
yield self
def refresh(self):
"""Rebinds and refreshes the URL. Call this if you modified the
rule in place.
:internal:
"""
self.bind(self.map, rebind=True)
def bind(self, map, rebind=False):
"""Bind the url to a map and create a regular expression based on
the information from the rule itself and the defaults from the map.
:internal:
"""
if self.map is not None and not rebind:
raise RuntimeError("url rule %r already bound to map %r" % (self, self.map))
self.map = map
if self.strict_slashes is None:
self.strict_slashes = map.strict_slashes
if self.merge_slashes is None:
self.merge_slashes = map.merge_slashes
if self.subdomain is None:
self.subdomain = map.default_subdomain
self.compile()
def get_converter(self, variable_name, converter_name, args, kwargs):
"""Looks up the converter for the given parameter.
.. versionadded:: 0.9
"""
if converter_name not in self.map.converters:
raise LookupError("the converter %r does not exist" % converter_name)
return self.map.converters[converter_name](self.map, *args, **kwargs)
def _encode_query_vars(self, query_vars):
return url_encode(
query_vars,
charset=self.map.charset,
sort=self.map.sort_parameters,
key=self.map.sort_key,
)
def compile(self):
"""Compiles the regular expression and stores it."""
assert self.map is not None, "rule not bound"
if self.map.host_matching:
domain_rule = self.host or ""
else:
domain_rule = self.subdomain or ""
self._trace = []
self._converters = {}
self._static_weights = []
self._argument_weights = []
regex_parts = []
def _build_regex(rule):
index = 0
for converter, arguments, variable in parse_rule(rule):
if converter is None:
for match in re.finditer(r"/+|[^/]+", variable):
part = match.group(0)
if part.startswith("/"):
if self.merge_slashes:
regex_parts.append(r"/+?")
self._trace.append((False, "/"))
else:
regex_parts.append(part)
self._trace.append((False, part))
continue
self._trace.append((False, part))
regex_parts.append(re.escape(part))
if part:
self._static_weights.append((index, -len(part)))
else:
if arguments:
c_args, c_kwargs = parse_converter_args(arguments)
else:
c_args = ()
c_kwargs = {}
convobj = self.get_converter(variable, converter, c_args, c_kwargs)
regex_parts.append("(?P<%s>%s)" % (variable, convobj.regex))
self._converters[variable] = convobj
self._trace.append((True, variable))
self._argument_weights.append(convobj.weight)
self.arguments.add(str(variable))
index = index + 1
_build_regex(domain_rule)
regex_parts.append("\\|")
self._trace.append((False, "|"))
_build_regex(self.rule if self.is_leaf else self.rule.rstrip("/"))
if not self.is_leaf:
self._trace.append((False, "/"))
self._build = self._compile_builder(False).__get__(self, None)
self._build_unknown = self._compile_builder(True).__get__(self, None)
if self.build_only:
return
if not (self.is_leaf and self.strict_slashes):
reps = u"*" if self.merge_slashes else u"?"
tail = u"(?<!/)(?P<__suffix__>/%s)" % reps
else:
tail = u""
regex = u"^%s%s$" % (u"".join(regex_parts), tail)
self._regex = re.compile(regex, re.UNICODE)
def match(self, path, method=None):
"""Check if the rule matches a given path. Path is a string in the
form ``"subdomain|/path"`` and is assembled by the map. If
the map is doing host matching the subdomain part will be the host
instead.
If the rule matches a dict with the converted values is returned,
otherwise the return value is `None`.
:internal:
"""
if not self.build_only:
require_redirect = False
m = self._regex.search(path)
if m is not None:
groups = m.groupdict()
# we have a folder like part of the url without a trailing
# slash and strict slashes enabled. raise an exception that
# tells the map to redirect to the same url but with a
# trailing slash
if (
self.strict_slashes
and not self.is_leaf
and not groups.pop("__suffix__")
and (
method is None or self.methods is None or method in self.methods
)
):
path += "/"
require_redirect = True
# if we are not in strict slashes mode we have to remove
# a __suffix__
elif not self.strict_slashes:
del groups["__suffix__"]
result = {}
for name, value in iteritems(groups):
try:
value = self._converters[name].to_python(value)
except ValidationError:
return
result[str(name)] = value
if self.defaults:
result.update(self.defaults)
if self.merge_slashes:
new_path = "|".join(self.build(result, False))
if path.endswith("/") and not new_path.endswith("/"):
new_path += "/"
if new_path.count("/") < path.count("/"):
path = new_path
require_redirect = True
if require_redirect:
path = path.split("|", 1)[1]
raise RequestPath(path)
if self.alias and self.map.redirect_defaults:
raise RequestAliasRedirect(result)
return result
@staticmethod
def _get_func_code(code, name):
globs, locs = {}, {}
exec(code, globs, locs)
return locs[name]
def _compile_builder(self, append_unknown=True):
defaults = self.defaults or {}
dom_ops = []
url_ops = []
opl = dom_ops
for is_dynamic, data in self._trace:
if data == "|" and opl is dom_ops:
opl = url_ops
continue
# this seems like a silly case to ever come up but:
# if a default is given for a value that appears in the rule,
# resolve it to a constant ahead of time
if is_dynamic and data in defaults:
data = self._converters[data].to_url(defaults[data])
opl.append((False, data))
elif not is_dynamic:
opl.append(
(False, url_quote(to_bytes(data, self.map.charset), safe="/:|+"))
)
else:
opl.append((True, data))
def _convert(elem):
ret = _prefix_names(_CALL_CONVERTER_CODE_FMT.format(elem=elem))
ret.args = [ast.Name(str(elem), ast.Load())] # str for py2
return ret
def _parts(ops):
parts = [
_convert(elem) if is_dynamic else ast.Str(s=elem)
for is_dynamic, elem in ops
]
parts = parts or [ast.Str("")]
# constant fold
ret = [parts[0]]
for p in parts[1:]:
if isinstance(p, ast.Str) and isinstance(ret[-1], ast.Str):
ret[-1] = ast.Str(ret[-1].s + p.s)
else:
ret.append(p)
return ret
dom_parts = _parts(dom_ops)
url_parts = _parts(url_ops)
if not append_unknown:
body = []
else:
body = [_IF_KWARGS_URL_ENCODE_AST]
url_parts.extend(_URL_ENCODE_AST_NAMES)
def _join(parts):
if len(parts) == 1: # shortcut
return parts[0]
elif hasattr(ast, "JoinedStr"): # py36+
return ast.JoinedStr(parts)
else:
call = _prefix_names('"".join()')
call.args = [ast.Tuple(parts, ast.Load())]
return call
body.append(
ast.Return(ast.Tuple([_join(dom_parts), _join(url_parts)], ast.Load()))
)
# str is necessary for python2
pargs = [
str(elem)
for is_dynamic, elem in dom_ops + url_ops
if is_dynamic and elem not in defaults
]
kargs = [str(k) for k in defaults]
func_ast = _prefix_names("def _(): pass")
func_ast.name = "<builder:{!r}>".format(self.rule)
if hasattr(ast, "arg"): # py3
func_ast.args.args.append(ast.arg(".self", None))
for arg in pargs + kargs:
func_ast.args.args.append(ast.arg(arg, None))
func_ast.args.kwarg = ast.arg(".kwargs", None)
else:
func_ast.args.args.append(ast.Name(".self", ast.Param()))
for arg in pargs + kargs:
func_ast.args.args.append(ast.Name(arg, ast.Param()))
func_ast.args.kwarg = ".kwargs"
for _ in kargs:
func_ast.args.defaults.append(ast.Str(""))
func_ast.body = body
# use `ast.parse` instead of `ast.Module` for better portability
# python3.8 changes the signature of `ast.Module`
module = ast.parse("")
module.body = [func_ast]
# mark everything as on line 1, offset 0
# less error-prone than `ast.fix_missing_locations`
# bad line numbers cause an assert to fail in debug builds
for node in ast.walk(module):
if "lineno" in node._attributes:
node.lineno = 1
if "col_offset" in node._attributes:
node.col_offset = 0
code = compile(module, "<werkzeug routing>", "exec")
return self._get_func_code(code, func_ast.name)
def build(self, values, append_unknown=True):
"""Assembles the relative url for that rule and the subdomain.
If building doesn't work for some reasons `None` is returned.
:internal:
"""
try:
if append_unknown:
return self._build_unknown(**values)
else:
return self._build(**values)
except ValidationError:
return None
def provides_defaults_for(self, rule):
"""Check if this rule has defaults for a given rule.
:internal:
"""
return (
not self.build_only
and self.defaults
and self.endpoint == rule.endpoint
and self != rule
and self.arguments == rule.arguments
)
def suitable_for(self, values, method=None):
"""Check if the dict of values has enough data for url generation.
:internal:
"""
# if a method was given explicitly and that method is not supported
# by this rule, this rule is not suitable.
if (
method is not None
and self.methods is not None
and method not in self.methods
):
return False
defaults = self.defaults or ()
# all arguments required must be either in the defaults dict or
# the value dictionary otherwise it's not suitable
for key in self.arguments:
if key not in defaults and key not in values:
return False
# in case defaults are given we ensure that either the value was
# skipped or the value is the same as the default value.
if defaults:
for key, value in iteritems(defaults):
if key in values and value != values[key]:
return False
return True
def match_compare_key(self):
"""The match compare key for sorting.
Current implementation:
1. rules without any arguments come first for performance
reasons only as we expect them to match faster and some
common ones usually don't have any arguments (index pages etc.)
2. rules with more static parts come first so the second argument
is the negative length of the number of the static weights.
3. we order by static weights, which is a combination of index
and length
4. The more complex rules come first so the next argument is the
negative length of the number of argument weights.
5. lastly we order by the actual argument weights.
:internal:
"""
return (
bool(self.arguments),
-len(self._static_weights),
self._static_weights,
-len(self._argument_weights),
self._argument_weights,
)
def build_compare_key(self):
"""The build compare key for sorting.
:internal:
"""
return 1 if self.alias else 0, -len(self.arguments), -len(self.defaults or ())
def __eq__(self, other):
return self.__class__ is other.__class__ and self._trace == other._trace
__hash__ = None
def __ne__(self, other):
return not self.__eq__(other)
def __str__(self):
return self.rule
@native_string_result
def __repr__(self):
if self.map is None:
return u"<%s (unbound)>" % self.__class__.__name__
tmp = []
for is_dynamic, data in self._trace:
if is_dynamic:
tmp.append(u"<%s>" % data)
else:
tmp.append(data)
return u"<%s %s%s -> %s>" % (
self.__class__.__name__,
repr((u"".join(tmp)).lstrip(u"|")).lstrip(u"u"),
self.methods is not None and u" (%s)" % u", ".join(self.methods) or u"",
self.endpoint,
)
class BaseConverter(object):
"""Base class for all converters."""
regex = "[^/]+"
weight = 100
def __init__(self, map):
self.map = map
def to_python(self, value):
return value
def to_url(self, value):
if isinstance(value, (bytes, bytearray)):
return _fast_url_quote(value)
return _fast_url_quote(text_type(value).encode(self.map.charset))
class UnicodeConverter(BaseConverter):
"""This converter is the default converter and accepts any string but
only one path segment. Thus the string can not include a slash.
This is the default validator.
Example::
Rule('/pages/<page>'),
Rule('/<string(length=2):lang_code>')
:param map: the :class:`Map`.
:param minlength: the minimum length of the string. Must be greater
or equal 1.
:param maxlength: the maximum length of the string.
:param length: the exact length of the string.
"""
def __init__(self, map, minlength=1, maxlength=None, length=None):
BaseConverter.__init__(self, map)
if length is not None:
length = "{%d}" % int(length)
else:
if maxlength is None:
maxlength = ""
else:
maxlength = int(maxlength)
length = "{%s,%s}" % (int(minlength), maxlength)
self.regex = "[^/]" + length
class AnyConverter(BaseConverter):
"""Matches one of the items provided. Items can either be Python
identifiers or strings::
Rule('/<any(about, help, imprint, class, "foo,bar"):page_name>')
:param map: the :class:`Map`.
:param items: this function accepts the possible items as positional
arguments.
"""
def __init__(self, map, *items):
BaseConverter.__init__(self, map)
self.regex = "(?:%s)" % "|".join([re.escape(x) for x in items])
class PathConverter(BaseConverter):
"""Like the default :class:`UnicodeConverter`, but it also matches
slashes. This is useful for wikis and similar applications::
Rule('/<path:wikipage>')
Rule('/<path:wikipage>/edit')
:param map: the :class:`Map`.
"""
regex = "[^/].*?"
weight = 200
class NumberConverter(BaseConverter):
"""Baseclass for `IntegerConverter` and `FloatConverter`.
:internal:
"""
weight = 50
def __init__(self, map, fixed_digits=0, min=None, max=None, signed=False):
if signed:
self.regex = self.signed_regex
BaseConverter.__init__(self, map)
self.fixed_digits = fixed_digits
self.min = min
self.max = max
self.signed = signed
def to_python(self, value):
if self.fixed_digits and len(value) != self.fixed_digits:
raise ValidationError()
value = self.num_convert(value)
if (self.min is not None and value < self.min) or (
self.max is not None and value > self.max
):
raise ValidationError()
return value
def to_url(self, value):
value = self.num_convert(value)
if self.fixed_digits:
value = ("%%0%sd" % self.fixed_digits) % value
return str(value)
@property
def signed_regex(self):
return r"-?" + self.regex
class IntegerConverter(NumberConverter):
"""This converter only accepts integer values::
Rule("/page/<int:page>")
By default it only accepts unsigned, positive values. The ``signed``
parameter will enable signed, negative values. ::
Rule("/page/<int(signed=True):page>")
:param map: The :class:`Map`.
:param fixed_digits: The number of fixed digits in the URL. If you
set this to ``4`` for example, the rule will only match if the
URL looks like ``/0001/``. The default is variable length.
:param min: The minimal value.
:param max: The maximal value.
:param signed: Allow signed (negative) values.
.. versionadded:: 0.15
The ``signed`` parameter.
"""
regex = r"\d+"
num_convert = int
class FloatConverter(NumberConverter):
"""This converter only accepts floating point values::
Rule("/probability/<float:probability>")
By default it only accepts unsigned, positive values. The ``signed``
parameter will enable signed, negative values. ::
Rule("/offset/<float(signed=True):offset>")
:param map: The :class:`Map`.
:param min: The minimal value.
:param max: The maximal value.
:param signed: Allow signed (negative) values.
.. versionadded:: 0.15
The ``signed`` parameter.
"""
regex = r"\d+\.\d+"
num_convert = float
def __init__(self, map, min=None, max=None, signed=False):
NumberConverter.__init__(self, map, min=min, max=max, signed=signed)
class UUIDConverter(BaseConverter):
"""This converter only accepts UUID strings::
Rule('/object/<uuid:identifier>')
.. versionadded:: 0.10
:param map: the :class:`Map`.
"""
regex = (
r"[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-"
r"[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}"
)
def to_python(self, value):
return uuid.UUID(value)
def to_url(self, value):
return str(value)
#: the default converter mapping for the map.
DEFAULT_CONVERTERS = {
"default": UnicodeConverter,
"string": UnicodeConverter,
"any": AnyConverter,
"path": PathConverter,
"int": IntegerConverter,
"float": FloatConverter,
"uuid": UUIDConverter,
}
class Map(object):
"""The map class stores all the URL rules and some configuration
parameters. Some of the configuration values are only stored on the
`Map` instance since those affect all rules, others are just defaults
and can be overridden for each rule. Note that you have to specify all
arguments besides the `rules` as keyword arguments!
:param rules: sequence of url rules for this map.
:param default_subdomain: The default subdomain for rules without a
subdomain defined.
:param charset: charset of the url. defaults to ``"utf-8"``
:param strict_slashes: If a rule ends with a slash but the matched
URL does not, redirect to the URL with a trailing slash.
:param merge_slashes: Merge consecutive slashes when matching or
building URLs. Matches will redirect to the normalized URL.
Slashes in variable parts are not merged.
:param redirect_defaults: This will redirect to the default rule if it
wasn't visited that way. This helps creating
unique URLs.
:param converters: A dict of converters that adds additional converters
to the list of converters. If you redefine one
converter this will override the original one.
:param sort_parameters: If set to `True` the url parameters are sorted.
See `url_encode` for more details.
:param sort_key: The sort key function for `url_encode`.
:param encoding_errors: the error method to use for decoding
:param host_matching: if set to `True` it enables the host matching
feature and disables the subdomain one. If
enabled the `host` parameter to rules is used
instead of the `subdomain` one.
.. versionchanged:: 1.0
If ``url_scheme`` is ``ws`` or ``wss``, only WebSocket rules
will match.
.. versionchanged:: 1.0
Added ``merge_slashes``.
.. versionchanged:: 0.7
Added ``encoding_errors`` and ``host_matching``.
.. versionchanged:: 0.5
Added ``sort_parameters`` and ``sort_key``.
"""
#: A dict of default converters to be used.
default_converters = ImmutableDict(DEFAULT_CONVERTERS)
#: The type of lock to use when updating.
#:
#: .. versionadded:: 1.0
lock_class = Lock
def __init__(
self,
rules=None,
default_subdomain="",
charset="utf-8",
strict_slashes=True,
merge_slashes=True,
redirect_defaults=True,
converters=None,
sort_parameters=False,
sort_key=None,
encoding_errors="replace",
host_matching=False,
):
self._rules = []
self._rules_by_endpoint = {}
self._remap = True
self._remap_lock = self.lock_class()
self.default_subdomain = default_subdomain
self.charset = charset
self.encoding_errors = encoding_errors
self.strict_slashes = strict_slashes
self.merge_slashes = merge_slashes
self.redirect_defaults = redirect_defaults
self.host_matching = host_matching
self.converters = self.default_converters.copy()
if converters:
self.converters.update(converters)
self.sort_parameters = sort_parameters
self.sort_key = sort_key
for rulefactory in rules or ():
self.add(rulefactory)
def is_endpoint_expecting(self, endpoint, *arguments):
"""Iterate over all rules and check if the endpoint expects
the arguments provided. This is for example useful if you have
some URLs that expect a language code and others that do not and
you want to wrap the builder a bit so that the current language
code is automatically added if not provided but endpoints expect
it.
:param endpoint: the endpoint to check.
:param arguments: this function accepts one or more arguments
as positional arguments. Each one of them is
checked.
"""
self.update()
arguments = set(arguments)
for rule in self._rules_by_endpoint[endpoint]:
if arguments.issubset(rule.arguments):
return True
return False
def iter_rules(self, endpoint=None):
"""Iterate over all rules or the rules of an endpoint.
:param endpoint: if provided only the rules for that endpoint
are returned.
:return: an iterator
"""
self.update()
if endpoint is not None:
return iter(self._rules_by_endpoint[endpoint])
return iter(self._rules)
def add(self, rulefactory):
"""Add a new rule or factory to the map and bind it. Requires that the
rule is not bound to another map.
:param rulefactory: a :class:`Rule` or :class:`RuleFactory`
"""
for rule in rulefactory.get_rules(self):
rule.bind(self)
self._rules.append(rule)
self._rules_by_endpoint.setdefault(rule.endpoint, []).append(rule)
self._remap = True
def bind(
self,
server_name,
script_name=None,
subdomain=None,
url_scheme="http",
default_method="GET",
path_info=None,
query_args=None,
):
"""Return a new :class:`MapAdapter` with the details specified to the
call. Note that `script_name` will default to ``'/'`` if not further
specified or `None`. The `server_name` at least is a requirement
because the HTTP RFC requires absolute URLs for redirects and so all
redirect exceptions raised by Werkzeug will contain the full canonical
URL.
If no path_info is passed to :meth:`match` it will use the default path
info passed to bind. While this doesn't really make sense for
manual bind calls, it's useful if you bind a map to a WSGI
environment which already contains the path info.
`subdomain` will default to the `default_subdomain` for this map if
no defined. If there is no `default_subdomain` you cannot use the
subdomain feature.
.. versionchanged:: 1.0
If ``url_scheme`` is ``ws`` or ``wss``, only WebSocket rules
will match.
.. versionchanged:: 0.15
``path_info`` defaults to ``'/'`` if ``None``.
.. versionchanged:: 0.8
``query_args`` can be a string.
.. versionchanged:: 0.7
Added ``query_args``.
"""
server_name = server_name.lower()
if self.host_matching:
if subdomain is not None:
raise RuntimeError("host matching enabled and a subdomain was provided")
elif subdomain is None:
subdomain = self.default_subdomain
if script_name is None:
script_name = "/"
if path_info is None:
path_info = "/"
try:
server_name = _encode_idna(server_name)
except UnicodeError:
raise BadHost()
return MapAdapter(
self,
server_name,
script_name,
subdomain,
url_scheme,
path_info,
default_method,
query_args,
)
def bind_to_environ(self, environ, server_name=None, subdomain=None):
"""Like :meth:`bind` but you can pass it an WSGI environment and it
will fetch the information from that dictionary. Note that because of
limitations in the protocol there is no way to get the current
subdomain and real `server_name` from the environment. If you don't
provide it, Werkzeug will use `SERVER_NAME` and `SERVER_PORT` (or
`HTTP_HOST` if provided) as used `server_name` with disabled subdomain
feature.
If `subdomain` is `None` but an environment and a server name is
provided it will calculate the current subdomain automatically.
Example: `server_name` is ``'example.com'`` and the `SERVER_NAME`
in the wsgi `environ` is ``'staging.dev.example.com'`` the calculated
subdomain will be ``'staging.dev'``.
If the object passed as environ has an environ attribute, the value of
this attribute is used instead. This allows you to pass request
objects. Additionally `PATH_INFO` added as a default of the
:class:`MapAdapter` so that you don't have to pass the path info to
the match method.
.. versionchanged:: 1.0.0
If the passed server name specifies port 443, it will match
if the incoming scheme is ``https`` without a port.
.. versionchanged:: 1.0.0
A warning is shown when the passed server name does not
match the incoming WSGI server name.
.. versionchanged:: 0.8
This will no longer raise a ValueError when an unexpected server
name was passed.
.. versionchanged:: 0.5
previously this method accepted a bogus `calculate_subdomain`
parameter that did not have any effect. It was removed because
of that.
:param environ: a WSGI environment.
:param server_name: an optional server name hint (see above).
:param subdomain: optionally the current subdomain (see above).
"""
environ = _get_environ(environ)
wsgi_server_name = get_host(environ).lower()
scheme = environ["wsgi.url_scheme"]
if server_name is None:
server_name = wsgi_server_name
else:
server_name = server_name.lower()
# strip standard port to match get_host()
if scheme == "http" and server_name.endswith(":80"):
server_name = server_name[:-3]
elif scheme == "https" and server_name.endswith(":443"):
server_name = server_name[:-4]
if subdomain is None and not self.host_matching:
cur_server_name = wsgi_server_name.split(".")
real_server_name = server_name.split(".")
offset = -len(real_server_name)
if cur_server_name[offset:] != real_server_name:
# This can happen even with valid configs if the server was
# accessed directly by IP address under some situations.
# Instead of raising an exception like in Werkzeug 0.7 or
# earlier we go by an invalid subdomain which will result
# in a 404 error on matching.
warnings.warn(
"Current server name '{}' doesn't match configured"
" server name '{}'".format(wsgi_server_name, server_name),
stacklevel=2,
)
subdomain = "<invalid>"
else:
subdomain = ".".join(filter(None, cur_server_name[:offset]))
def _get_wsgi_string(name):
val = environ.get(name)
if val is not None:
return wsgi_decoding_dance(val, self.charset)
script_name = _get_wsgi_string("SCRIPT_NAME")
path_info = _get_wsgi_string("PATH_INFO")
query_args = _get_wsgi_string("QUERY_STRING")
return Map.bind(
self,
server_name,
script_name,
subdomain,
scheme,
environ["REQUEST_METHOD"],
path_info,
query_args=query_args,
)
def update(self):
"""Called before matching and building to keep the compiled rules
in the correct order after things changed.
"""
if not self._remap:
return
with self._remap_lock:
if not self._remap:
return
self._rules.sort(key=lambda x: x.match_compare_key())
for rules in itervalues(self._rules_by_endpoint):
rules.sort(key=lambda x: x.build_compare_key())
self._remap = False
def __repr__(self):
rules = self.iter_rules()
return "%s(%s)" % (self.__class__.__name__, pformat(list(rules)))
class MapAdapter(object):
"""Returned by :meth:`Map.bind` or :meth:`Map.bind_to_environ` and does
the URL matching and building based on runtime information.
"""
def __init__(
self,
map,
server_name,
script_name,
subdomain,
url_scheme,
path_info,
default_method,
query_args=None,
):
self.map = map
self.server_name = to_unicode(server_name)
script_name = to_unicode(script_name)
if not script_name.endswith(u"/"):
script_name += u"/"
self.script_name = script_name
self.subdomain = to_unicode(subdomain)
self.url_scheme = to_unicode(url_scheme)
self.path_info = to_unicode(path_info)
self.default_method = to_unicode(default_method)
self.query_args = query_args
self.websocket = self.url_scheme in {"ws", "wss"}
def dispatch(
self, view_func, path_info=None, method=None, catch_http_exceptions=False
):
"""Does the complete dispatching process. `view_func` is called with
the endpoint and a dict with the values for the view. It should
look up the view function, call it, and return a response object
or WSGI application. http exceptions are not caught by default
so that applications can display nicer error messages by just
catching them by hand. If you want to stick with the default
error messages you can pass it ``catch_http_exceptions=True`` and
it will catch the http exceptions.
Here a small example for the dispatch usage::
from werkzeug.wrappers import Request, Response
from werkzeug.wsgi import responder
from werkzeug.routing import Map, Rule
def on_index(request):
return Response('Hello from the index')
url_map = Map([Rule('/', endpoint='index')])
views = {'index': on_index}
@responder
def application(environ, start_response):
request = Request(environ)
urls = url_map.bind_to_environ(environ)
return urls.dispatch(lambda e, v: views[e](request, **v),
catch_http_exceptions=True)
Keep in mind that this method might return exception objects, too, so
use :class:`Response.force_type` to get a response object.
:param view_func: a function that is called with the endpoint as
first argument and the value dict as second. Has
to dispatch to the actual view function with this
information. (see above)
:param path_info: the path info to use for matching. Overrides the
path info specified on binding.
:param method: the HTTP method used for matching. Overrides the
method specified on binding.
:param catch_http_exceptions: set to `True` to catch any of the
werkzeug :class:`HTTPException`\\s.
"""
try:
try:
endpoint, args = self.match(path_info, method)
except RequestRedirect as e:
return e
return view_func(endpoint, args)
except HTTPException as e:
if catch_http_exceptions:
return e
raise
def match(
self,
path_info=None,
method=None,
return_rule=False,
query_args=None,
websocket=None,
):
"""The usage is simple: you just pass the match method the current
path info as well as the method (which defaults to `GET`). The
following things can then happen:
- you receive a `NotFound` exception that indicates that no URL is
matching. A `NotFound` exception is also a WSGI application you
can call to get a default page not found page (happens to be the
same object as `werkzeug.exceptions.NotFound`)
- you receive a `MethodNotAllowed` exception that indicates that there
is a match for this URL but not for the current request method.
This is useful for RESTful applications.
- you receive a `RequestRedirect` exception with a `new_url`
attribute. This exception is used to notify you about a request
Werkzeug requests from your WSGI application. This is for example the
case if you request ``/foo`` although the correct URL is ``/foo/``
You can use the `RequestRedirect` instance as response-like object
similar to all other subclasses of `HTTPException`.
- you receive a ``WebsocketMismatch`` exception if the only
match is a WebSocket rule but the bind is an HTTP request, or
if the match is an HTTP rule but the bind is a WebSocket
request.
- you get a tuple in the form ``(endpoint, arguments)`` if there is
a match (unless `return_rule` is True, in which case you get a tuple
in the form ``(rule, arguments)``)
If the path info is not passed to the match method the default path
info of the map is used (defaults to the root URL if not defined
explicitly).
All of the exceptions raised are subclasses of `HTTPException` so they
can be used as WSGI responses. They will all render generic error or
redirect pages.
Here is a small example for matching:
>>> m = Map([
... Rule('/', endpoint='index'),
... Rule('/downloads/', endpoint='downloads/index'),
... Rule('/downloads/<int:id>', endpoint='downloads/show')
... ])
>>> urls = m.bind("example.com", "/")
>>> urls.match("/", "GET")
('index', {})
>>> urls.match("/downloads/42")
('downloads/show', {'id': 42})
And here is what happens on redirect and missing URLs:
>>> urls.match("/downloads")
Traceback (most recent call last):
...
RequestRedirect: http://example.com/downloads/
>>> urls.match("/missing")
Traceback (most recent call last):
...
NotFound: 404 Not Found
:param path_info: the path info to use for matching. Overrides the
path info specified on binding.
:param method: the HTTP method used for matching. Overrides the
method specified on binding.
:param return_rule: return the rule that matched instead of just the
endpoint (defaults to `False`).
:param query_args: optional query arguments that are used for
automatic redirects as string or dictionary. It's
currently not possible to use the query arguments
for URL matching.
:param websocket: Match WebSocket instead of HTTP requests. A
websocket request has a ``ws`` or ``wss``
:attr:`url_scheme`. This overrides that detection.
.. versionadded:: 1.0
Added ``websocket``.
.. versionchanged:: 0.8
``query_args`` can be a string.
.. versionadded:: 0.7
Added ``query_args``.
.. versionadded:: 0.6
Added ``return_rule``.
"""
self.map.update()
if path_info is None:
path_info = self.path_info
else:
path_info = to_unicode(path_info, self.map.charset)
if query_args is None:
query_args = self.query_args
method = (method or self.default_method).upper()
if websocket is None:
websocket = self.websocket
require_redirect = False
path = u"%s|%s" % (
self.map.host_matching and self.server_name or self.subdomain,
path_info and "/%s" % path_info.lstrip("/"),
)
have_match_for = set()
websocket_mismatch = False
for rule in self.map._rules:
try:
rv = rule.match(path, method)
except RequestPath as e:
raise RequestRedirect(
self.make_redirect_url(
url_quote(e.path_info, self.map.charset, safe="/:|+"),
query_args,
)
)
except RequestAliasRedirect as e:
raise RequestRedirect(
self.make_alias_redirect_url(
path, rule.endpoint, e.matched_values, method, query_args
)
)
if rv is None:
continue
if rule.methods is not None and method not in rule.methods:
have_match_for.update(rule.methods)
continue
if rule.websocket != websocket:
websocket_mismatch = True
continue
if self.map.redirect_defaults:
redirect_url = self.get_default_redirect(rule, method, rv, query_args)
if redirect_url is not None:
raise RequestRedirect(redirect_url)
if rule.redirect_to is not None:
if isinstance(rule.redirect_to, string_types):
def _handle_match(match):
value = rv[match.group(1)]
return rule._converters[match.group(1)].to_url(value)
redirect_url = _simple_rule_re.sub(_handle_match, rule.redirect_to)
else:
redirect_url = rule.redirect_to(self, **rv)
raise RequestRedirect(
str(
url_join(
"%s://%s%s%s"
% (
self.url_scheme or "http",
self.subdomain + "." if self.subdomain else "",
self.server_name,
self.script_name,
),
redirect_url,
)
)
)
if require_redirect:
raise RequestRedirect(
self.make_redirect_url(
url_quote(path_info, self.map.charset, safe="/:|+"), query_args
)
)
if return_rule:
return rule, rv
else:
return rule.endpoint, rv
if have_match_for:
raise MethodNotAllowed(valid_methods=list(have_match_for))
if websocket_mismatch:
raise WebsocketMismatch()
raise NotFound()
def test(self, path_info=None, method=None):
"""Test if a rule would match. Works like `match` but returns `True`
if the URL matches, or `False` if it does not exist.
:param path_info: the path info to use for matching. Overrides the
path info specified on binding.
:param method: the HTTP method used for matching. Overrides the
method specified on binding.
"""
try:
self.match(path_info, method)
except RequestRedirect:
pass
except HTTPException:
return False
return True
def allowed_methods(self, path_info=None):
"""Returns the valid methods that match for a given path.
.. versionadded:: 0.7
"""
try:
self.match(path_info, method="--")
except MethodNotAllowed as e:
return e.valid_methods
except HTTPException:
pass
return []
def get_host(self, domain_part):
"""Figures out the full host name for the given domain part. The
domain part is a subdomain in case host matching is disabled or
a full host name.
"""
if self.map.host_matching:
if domain_part is None:
return self.server_name
return to_unicode(domain_part, "ascii")
subdomain = domain_part
if subdomain is None:
subdomain = self.subdomain
else:
subdomain = to_unicode(subdomain, "ascii")
return (subdomain + u"." if subdomain else u"") + self.server_name
def get_default_redirect(self, rule, method, values, query_args):
"""A helper that returns the URL to redirect to if it finds one.
This is used for default redirecting only.
:internal:
"""
assert self.map.redirect_defaults
for r in self.map._rules_by_endpoint[rule.endpoint]:
# every rule that comes after this one, including ourself
# has a lower priority for the defaults. We order the ones
# with the highest priority up for building.
if r is rule:
break
if r.provides_defaults_for(rule) and r.suitable_for(values, method):
values.update(r.defaults)
domain_part, path = r.build(values)
return self.make_redirect_url(path, query_args, domain_part=domain_part)
def encode_query_args(self, query_args):
if not isinstance(query_args, string_types):
query_args = url_encode(query_args, self.map.charset)
return query_args
def make_redirect_url(self, path_info, query_args=None, domain_part=None):
"""Creates a redirect URL.
:internal:
"""
suffix = ""
if query_args:
suffix = "?" + self.encode_query_args(query_args)
return str(
"%s://%s/%s%s"
% (
self.url_scheme or "http",
self.get_host(domain_part),
posixpath.join(
self.script_name[:-1].lstrip("/"), path_info.lstrip("/")
),
suffix,
)
)
def make_alias_redirect_url(self, path, endpoint, values, method, query_args):
"""Internally called to make an alias redirect URL."""
url = self.build(
endpoint, values, method, append_unknown=False, force_external=True
)
if query_args:
url += "?" + self.encode_query_args(query_args)
assert url != path, "detected invalid alias setting. No canonical URL found"
return url
def _partial_build(self, endpoint, values, method, append_unknown):
"""Helper for :meth:`build`. Returns subdomain and path for the
rule that accepts this endpoint, values and method.
:internal:
"""
# in case the method is none, try with the default method first
if method is None:
rv = self._partial_build(
endpoint, values, self.default_method, append_unknown
)
if rv is not None:
return rv
# Default method did not match or a specific method is passed.
# Check all for first match with matching host. If no matching
# host is found, go with first result.
first_match = None
for rule in self.map._rules_by_endpoint.get(endpoint, ()):
if rule.suitable_for(values, method):
rv = rule.build(values, append_unknown)
if rv is not None:
rv = (rv[0], rv[1], rule.websocket)
if self.map.host_matching:
if rv[0] == self.server_name:
return rv
elif first_match is None:
first_match = rv
else:
return rv
return first_match
def build(
self,
endpoint,
values=None,
method=None,
force_external=False,
append_unknown=True,
):
"""Building URLs works pretty much the other way round. Instead of
`match` you call `build` and pass it the endpoint and a dict of
arguments for the placeholders.
The `build` function also accepts an argument called `force_external`
which, if you set it to `True` will force external URLs. Per default
external URLs (include the server name) will only be used if the
target URL is on a different subdomain.
>>> m = Map([
... Rule('/', endpoint='index'),
... Rule('/downloads/', endpoint='downloads/index'),
... Rule('/downloads/<int:id>', endpoint='downloads/show')
... ])
>>> urls = m.bind("example.com", "/")
>>> urls.build("index", {})
'/'
>>> urls.build("downloads/show", {'id': 42})
'/downloads/42'
>>> urls.build("downloads/show", {'id': 42}, force_external=True)
'http://example.com/downloads/42'
Because URLs cannot contain non ASCII data you will always get
bytestrings back. Non ASCII characters are urlencoded with the
charset defined on the map instance.
Additional values are converted to unicode and appended to the URL as
URL querystring parameters:
>>> urls.build("index", {'q': 'My Searchstring'})
'/?q=My+Searchstring'
When processing those additional values, lists are furthermore
interpreted as multiple values (as per
:py:class:`werkzeug.datastructures.MultiDict`):
>>> urls.build("index", {'q': ['a', 'b', 'c']})
'/?q=a&q=b&q=c'
Passing a ``MultiDict`` will also add multiple values:
>>> urls.build("index", MultiDict((('p', 'z'), ('q', 'a'), ('q', 'b'))))
'/?p=z&q=a&q=b'
If a rule does not exist when building a `BuildError` exception is
raised.
The build method accepts an argument called `method` which allows you
to specify the method you want to have an URL built for if you have
different methods for the same endpoint specified.
.. versionadded:: 0.6
the `append_unknown` parameter was added.
:param endpoint: the endpoint of the URL to build.
:param values: the values for the URL to build. Unhandled values are
appended to the URL as query parameters.
:param method: the HTTP method for the rule if there are different
URLs for different methods on the same endpoint.
:param force_external: enforce full canonical external URLs. If the URL
scheme is not provided, this will generate
a protocol-relative URL.
:param append_unknown: unknown parameters are appended to the generated
URL as query string argument. Disable this
if you want the builder to ignore those.
"""
self.map.update()
if values:
if isinstance(values, MultiDict):
temp_values = {}
# iteritems(dict, values) is like `values.lists()`
# without the call or `list()` coercion overhead.
for key, value in iteritems(dict, values):
if not value:
continue
if len(value) == 1: # flatten single item lists
value = value[0]
if value is None: # drop None
continue
temp_values[key] = value
values = temp_values
else:
# drop None
values = dict(i for i in iteritems(values) if i[1] is not None)
else:
values = {}
rv = self._partial_build(endpoint, values, method, append_unknown)
if rv is None:
raise BuildError(endpoint, values, method, self)
domain_part, path, websocket = rv
host = self.get_host(domain_part)
# Always build WebSocket routes with the scheme (browsers
# require full URLs). If bound to a WebSocket, ensure that HTTP
# routes are built with an HTTP scheme.
url_scheme = self.url_scheme
secure = url_scheme in {"https", "wss"}
if websocket:
force_external = True
url_scheme = "wss" if secure else "ws"
elif url_scheme:
url_scheme = "https" if secure else "http"
# shortcut this.
if not force_external and (
(self.map.host_matching and host == self.server_name)
or (not self.map.host_matching and domain_part == self.subdomain)
):
return "%s/%s" % (self.script_name.rstrip("/"), path.lstrip("/"))
return str(
"%s//%s%s/%s"
% (
url_scheme + ":" if url_scheme else "",
host,
self.script_name[:-1],
path.lstrip("/"),
)
)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/http.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.http
~~~~~~~~~~~~~
Werkzeug comes with a bunch of utilities that help Werkzeug to deal with
HTTP data. Most of the classes and functions provided by this module are
used by the wrappers, but they are useful on their own, too, especially if
the response and request objects are not used.
This covers some of the more HTTP centric features of WSGI, some other
utilities such as cookie handling are documented in the `werkzeug.utils`
module.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import base64
import re
import warnings
from datetime import datetime
from datetime import timedelta
from hashlib import md5
from time import gmtime
from time import time
from ._compat import integer_types
from ._compat import iteritems
from ._compat import PY2
from ._compat import string_types
from ._compat import text_type
from ._compat import to_bytes
from ._compat import to_unicode
from ._compat import try_coerce_native
from ._internal import _cookie_parse_impl
from ._internal import _cookie_quote
from ._internal import _make_cookie_domain
try:
from email.utils import parsedate_tz
except ImportError:
from email.Utils import parsedate_tz
try:
from urllib.request import parse_http_list as _parse_list_header
from urllib.parse import unquote_to_bytes as _unquote
except ImportError:
from urllib2 import parse_http_list as _parse_list_header
from urllib2 import unquote as _unquote
_cookie_charset = "latin1"
_basic_auth_charset = "utf-8"
# for explanation of "media-range", etc. see Sections 5.3.{1,2} of RFC 7231
_accept_re = re.compile(
r"""
( # media-range capturing-parenthesis
[^\s;,]+ # type/subtype
(?:[ \t]*;[ \t]* # ";"
(?: # parameter non-capturing-parenthesis
[^\s;,q][^\s;,]* # token that doesn't start with "q"
| # or
q[^\s;,=][^\s;,]* # token that is more than just "q"
)
)* # zero or more parameters
) # end of media-range
(?:[ \t]*;[ \t]*q= # weight is a "q" parameter
(\d*(?:\.\d+)?) # qvalue capturing-parentheses
[^,]* # "extension" accept params: who cares?
)? # accept params are optional
""",
re.VERBOSE,
)
_token_chars = frozenset(
"!#$%&'*+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ^_`abcdefghijklmnopqrstuvwxyz|~"
)
_etag_re = re.compile(r'([Ww]/)?(?:"(.*?)"|(.*?))(?:\s*,\s*|$)')
_unsafe_header_chars = set('()<>@,;:"/[]?={} \t')
_option_header_piece_re = re.compile(
r"""
;\s*,?\s* # newlines were replaced with commas
(?P<key>
"[^"\\]*(?:\\.[^"\\]*)*" # quoted string
|
[^\s;,=*]+ # token
)
(?:\*(?P<count>\d+))? # *1, optional continuation index
\s*
(?: # optionally followed by =value
(?: # equals sign, possibly with encoding
\*\s*=\s* # * indicates extended notation
(?: # optional encoding
(?P<encoding>[^\s]+?)
'(?P<language>[^\s]*?)'
)?
|
=\s* # basic notation
)
(?P<value>
"[^"\\]*(?:\\.[^"\\]*)*" # quoted string
|
[^;,]+ # token
)?
)?
\s*
""",
flags=re.VERBOSE,
)
_option_header_start_mime_type = re.compile(r",\s*([^;,\s]+)([;,]\s*.+)?")
_entity_headers = frozenset(
[
"allow",
"content-encoding",
"content-language",
"content-length",
"content-location",
"content-md5",
"content-range",
"content-type",
"expires",
"last-modified",
]
)
_hop_by_hop_headers = frozenset(
[
"connection",
"keep-alive",
"proxy-authenticate",
"proxy-authorization",
"te",
"trailer",
"transfer-encoding",
"upgrade",
]
)
HTTP_STATUS_CODES = {
100: "Continue",
101: "Switching Protocols",
102: "Processing",
103: "Early Hints", # see RFC 8297
200: "OK",
201: "Created",
202: "Accepted",
203: "Non Authoritative Information",
204: "No Content",
205: "Reset Content",
206: "Partial Content",
207: "Multi Status",
208: "Already Reported", # see RFC 5842
226: "IM Used", # see RFC 3229
300: "Multiple Choices",
301: "Moved Permanently",
302: "Found",
303: "See Other",
304: "Not Modified",
305: "Use Proxy",
306: "Switch Proxy", # unused
307: "Temporary Redirect",
308: "Permanent Redirect",
400: "Bad Request",
401: "Unauthorized",
402: "Payment Required", # unused
403: "Forbidden",
404: "Not Found",
405: "Method Not Allowed",
406: "Not Acceptable",
407: "Proxy Authentication Required",
408: "Request Timeout",
409: "Conflict",
410: "Gone",
411: "Length Required",
412: "Precondition Failed",
413: "Request Entity Too Large",
414: "Request URI Too Long",
415: "Unsupported Media Type",
416: "Requested Range Not Satisfiable",
417: "Expectation Failed",
418: "I'm a teapot", # see RFC 2324
421: "Misdirected Request", # see RFC 7540
422: "Unprocessable Entity",
423: "Locked",
424: "Failed Dependency",
425: "Too Early", # see RFC 8470
426: "Upgrade Required",
428: "Precondition Required", # see RFC 6585
429: "Too Many Requests",
431: "Request Header Fields Too Large",
449: "Retry With", # proprietary MS extension
451: "Unavailable For Legal Reasons",
500: "Internal Server Error",
501: "Not Implemented",
502: "Bad Gateway",
503: "Service Unavailable",
504: "Gateway Timeout",
505: "HTTP Version Not Supported",
506: "Variant Also Negotiates", # see RFC 2295
507: "Insufficient Storage",
508: "Loop Detected", # see RFC 5842
510: "Not Extended",
511: "Network Authentication Failed", # see RFC 6585
}
def wsgi_to_bytes(data):
"""coerce wsgi unicode represented bytes to real ones"""
if isinstance(data, bytes):
return data
return data.encode("latin1") # XXX: utf8 fallback?
def bytes_to_wsgi(data):
assert isinstance(data, bytes), "data must be bytes"
if isinstance(data, str):
return data
else:
return data.decode("latin1")
def quote_header_value(value, extra_chars="", allow_token=True):
"""Quote a header value if necessary.
.. versionadded:: 0.5
:param value: the value to quote.
:param extra_chars: a list of extra characters to skip quoting.
:param allow_token: if this is enabled token values are returned
unchanged.
"""
if isinstance(value, bytes):
value = bytes_to_wsgi(value)
value = str(value)
if allow_token:
token_chars = _token_chars | set(extra_chars)
if set(value).issubset(token_chars):
return value
return '"%s"' % value.replace("\\", "\\\\").replace('"', '\\"')
def unquote_header_value(value, is_filename=False):
r"""Unquotes a header value. (Reversal of :func:`quote_header_value`).
This does not use the real unquoting but what browsers are actually
using for quoting.
.. versionadded:: 0.5
:param value: the header value to unquote.
"""
if value and value[0] == value[-1] == '"':
# this is not the real unquoting, but fixing this so that the
# RFC is met will result in bugs with internet explorer and
# probably some other browsers as well. IE for example is
# uploading files with "C:\foo\bar.txt" as filename
value = value[1:-1]
# if this is a filename and the starting characters look like
# a UNC path, then just return the value without quotes. Using the
# replace sequence below on a UNC path has the effect of turning
# the leading double slash into a single slash and then
# _fix_ie_filename() doesn't work correctly. See #458.
if not is_filename or value[:2] != "\\\\":
return value.replace("\\\\", "\\").replace('\\"', '"')
return value
def dump_options_header(header, options):
"""The reverse function to :func:`parse_options_header`.
:param header: the header to dump
:param options: a dict of options to append.
"""
segments = []
if header is not None:
segments.append(header)
for key, value in iteritems(options):
if value is None:
segments.append(key)
else:
segments.append("%s=%s" % (key, quote_header_value(value)))
return "; ".join(segments)
def dump_header(iterable, allow_token=True):
"""Dump an HTTP header again. This is the reversal of
:func:`parse_list_header`, :func:`parse_set_header` and
:func:`parse_dict_header`. This also quotes strings that include an
equals sign unless you pass it as dict of key, value pairs.
>>> dump_header({'foo': 'bar baz'})
'foo="bar baz"'
>>> dump_header(('foo', 'bar baz'))
'foo, "bar baz"'
:param iterable: the iterable or dict of values to quote.
:param allow_token: if set to `False` tokens as values are disallowed.
See :func:`quote_header_value` for more details.
"""
if isinstance(iterable, dict):
items = []
for key, value in iteritems(iterable):
if value is None:
items.append(key)
else:
items.append(
"%s=%s" % (key, quote_header_value(value, allow_token=allow_token))
)
else:
items = [quote_header_value(x, allow_token=allow_token) for x in iterable]
return ", ".join(items)
def dump_csp_header(header):
"""Dump a Content Security Policy header.
These are structured into policies such as "default-src 'self';
script-src 'self'".
.. versionadded:: 1.0.0
Support for Content Security Policy headers was added.
"""
return "; ".join("%s %s" % (key, value) for key, value in iteritems(header))
def parse_list_header(value):
"""Parse lists as described by RFC 2068 Section 2.
In particular, parse comma-separated lists where the elements of
the list may include quoted-strings. A quoted-string could
contain a comma. A non-quoted string could have quotes in the
middle. Quotes are removed automatically after parsing.
It basically works like :func:`parse_set_header` just that items
may appear multiple times and case sensitivity is preserved.
The return value is a standard :class:`list`:
>>> parse_list_header('token, "quoted value"')
['token', 'quoted value']
To create a header from the :class:`list` again, use the
:func:`dump_header` function.
:param value: a string with a list header.
:return: :class:`list`
"""
result = []
for item in _parse_list_header(value):
if item[:1] == item[-1:] == '"':
item = unquote_header_value(item[1:-1])
result.append(item)
return result
def parse_dict_header(value, cls=dict):
"""Parse lists of key, value pairs as described by RFC 2068 Section 2 and
convert them into a python dict (or any other mapping object created from
the type with a dict like interface provided by the `cls` argument):
>>> d = parse_dict_header('foo="is a fish", bar="as well"')
>>> type(d) is dict
True
>>> sorted(d.items())
[('bar', 'as well'), ('foo', 'is a fish')]
If there is no value for a key it will be `None`:
>>> parse_dict_header('key_without_value')
{'key_without_value': None}
To create a header from the :class:`dict` again, use the
:func:`dump_header` function.
.. versionchanged:: 0.9
Added support for `cls` argument.
:param value: a string with a dict header.
:param cls: callable to use for storage of parsed results.
:return: an instance of `cls`
"""
result = cls()
if not isinstance(value, text_type):
# XXX: validate
value = bytes_to_wsgi(value)
for item in _parse_list_header(value):
if "=" not in item:
result[item] = None
continue
name, value = item.split("=", 1)
if value[:1] == value[-1:] == '"':
value = unquote_header_value(value[1:-1])
result[name] = value
return result
def parse_options_header(value, multiple=False):
"""Parse a ``Content-Type`` like header into a tuple with the content
type and the options:
>>> parse_options_header('text/html; charset=utf8')
('text/html', {'charset': 'utf8'})
This should not be used to parse ``Cache-Control`` like headers that use
a slightly different format. For these headers use the
:func:`parse_dict_header` function.
.. versionchanged:: 0.15
:rfc:`2231` parameter continuations are handled.
.. versionadded:: 0.5
:param value: the header to parse.
:param multiple: Whether try to parse and return multiple MIME types
:return: (mimetype, options) or (mimetype, options, mimetype, options, …)
if multiple=True
"""
if not value:
return "", {}
result = []
value = "," + value.replace("\n", ",")
while value:
match = _option_header_start_mime_type.match(value)
if not match:
break
result.append(match.group(1)) # mimetype
options = {}
# Parse options
rest = match.group(2)
continued_encoding = None
while rest:
optmatch = _option_header_piece_re.match(rest)
if not optmatch:
break
option, count, encoding, language, option_value = optmatch.groups()
# Continuations don't have to supply the encoding after the
# first line. If we're in a continuation, track the current
# encoding to use for subsequent lines. Reset it when the
# continuation ends.
if not count:
continued_encoding = None
else:
if not encoding:
encoding = continued_encoding
continued_encoding = encoding
option = unquote_header_value(option)
if option_value is not None:
option_value = unquote_header_value(option_value, option == "filename")
if encoding is not None:
option_value = _unquote(option_value).decode(encoding)
if count:
# Continuations append to the existing value. For
# simplicity, this ignores the possibility of
# out-of-order indices, which shouldn't happen anyway.
options[option] = options.get(option, "") + option_value
else:
options[option] = option_value
rest = rest[optmatch.end() :]
result.append(options)
if multiple is False:
return tuple(result)
value = rest
return tuple(result) if result else ("", {})
def parse_accept_header(value, cls=None):
"""Parses an HTTP Accept-* header. This does not implement a complete
valid algorithm but one that supports at least value and quality
extraction.
Returns a new :class:`Accept` object (basically a list of ``(value, quality)``
tuples sorted by the quality with some additional accessor methods).
The second parameter can be a subclass of :class:`Accept` that is created
with the parsed values and returned.
:param value: the accept header string to be parsed.
:param cls: the wrapper class for the return value (can be
:class:`Accept` or a subclass thereof)
:return: an instance of `cls`.
"""
if cls is None:
cls = Accept
if not value:
return cls(None)
result = []
for match in _accept_re.finditer(value):
quality = match.group(2)
if not quality:
quality = 1
else:
quality = max(min(float(quality), 1), 0)
result.append((match.group(1), quality))
return cls(result)
def parse_cache_control_header(value, on_update=None, cls=None):
"""Parse a cache control header. The RFC differs between response and
request cache control, this method does not. It's your responsibility
to not use the wrong control statements.
.. versionadded:: 0.5
The `cls` was added. If not specified an immutable
:class:`~werkzeug.datastructures.RequestCacheControl` is returned.
:param value: a cache control header to be parsed.
:param on_update: an optional callable that is called every time a value
on the :class:`~werkzeug.datastructures.CacheControl`
object is changed.
:param cls: the class for the returned object. By default
:class:`~werkzeug.datastructures.RequestCacheControl` is used.
:return: a `cls` object.
"""
if cls is None:
cls = RequestCacheControl
if not value:
return cls(None, on_update)
return cls(parse_dict_header(value), on_update)
def parse_csp_header(value, on_update=None, cls=None):
"""Parse a Content Security Policy header.
.. versionadded:: 1.0.0
Support for Content Security Policy headers was added.
:param value: a csp header to be parsed.
:param on_update: an optional callable that is called every time a value
on the object is changed.
:param cls: the class for the returned object. By default
:class:`~werkzeug.datastructures.ContentSecurityPolicy` is used.
:return: a `cls` object.
"""
if cls is None:
cls = ContentSecurityPolicy
if value is None:
return cls(None, on_update)
items = []
for policy in value.split(";"):
policy = policy.strip()
# Ignore badly formatted policies (no space)
if " " in policy:
directive, value = policy.strip().split(" ", 1)
items.append((directive.strip(), value.strip()))
return cls(items, on_update)
def parse_set_header(value, on_update=None):
"""Parse a set-like header and return a
:class:`~werkzeug.datastructures.HeaderSet` object:
>>> hs = parse_set_header('token, "quoted value"')
The return value is an object that treats the items case-insensitively
and keeps the order of the items:
>>> 'TOKEN' in hs
True
>>> hs.index('quoted value')
1
>>> hs
HeaderSet(['token', 'quoted value'])
To create a header from the :class:`HeaderSet` again, use the
:func:`dump_header` function.
:param value: a set header to be parsed.
:param on_update: an optional callable that is called every time a
value on the :class:`~werkzeug.datastructures.HeaderSet`
object is changed.
:return: a :class:`~werkzeug.datastructures.HeaderSet`
"""
if not value:
return HeaderSet(None, on_update)
return HeaderSet(parse_list_header(value), on_update)
def parse_authorization_header(value):
"""Parse an HTTP basic/digest authorization header transmitted by the web
browser. The return value is either `None` if the header was invalid or
not given, otherwise an :class:`~werkzeug.datastructures.Authorization`
object.
:param value: the authorization header to parse.
:return: a :class:`~werkzeug.datastructures.Authorization` object or `None`.
"""
if not value:
return
value = wsgi_to_bytes(value)
try:
auth_type, auth_info = value.split(None, 1)
auth_type = auth_type.lower()
except ValueError:
return
if auth_type == b"basic":
try:
username, password = base64.b64decode(auth_info).split(b":", 1)
except Exception:
return
return Authorization(
"basic",
{
"username": to_unicode(username, _basic_auth_charset),
"password": to_unicode(password, _basic_auth_charset),
},
)
elif auth_type == b"digest":
auth_map = parse_dict_header(auth_info)
for key in "username", "realm", "nonce", "uri", "response":
if key not in auth_map:
return
if "qop" in auth_map:
if not auth_map.get("nc") or not auth_map.get("cnonce"):
return
return Authorization("digest", auth_map)
def parse_www_authenticate_header(value, on_update=None):
"""Parse an HTTP WWW-Authenticate header into a
:class:`~werkzeug.datastructures.WWWAuthenticate` object.
:param value: a WWW-Authenticate header to parse.
:param on_update: an optional callable that is called every time a value
on the :class:`~werkzeug.datastructures.WWWAuthenticate`
object is changed.
:return: a :class:`~werkzeug.datastructures.WWWAuthenticate` object.
"""
if not value:
return WWWAuthenticate(on_update=on_update)
try:
auth_type, auth_info = value.split(None, 1)
auth_type = auth_type.lower()
except (ValueError, AttributeError):
return WWWAuthenticate(value.strip().lower(), on_update=on_update)
return WWWAuthenticate(auth_type, parse_dict_header(auth_info), on_update)
def parse_if_range_header(value):
"""Parses an if-range header which can be an etag or a date. Returns
a :class:`~werkzeug.datastructures.IfRange` object.
.. versionadded:: 0.7
"""
if not value:
return IfRange()
date = parse_date(value)
if date is not None:
return IfRange(date=date)
# drop weakness information
return IfRange(unquote_etag(value)[0])
def parse_range_header(value, make_inclusive=True):
"""Parses a range header into a :class:`~werkzeug.datastructures.Range`
object. If the header is missing or malformed `None` is returned.
`ranges` is a list of ``(start, stop)`` tuples where the ranges are
non-inclusive.
.. versionadded:: 0.7
"""
if not value or "=" not in value:
return None
ranges = []
last_end = 0
units, rng = value.split("=", 1)
units = units.strip().lower()
for item in rng.split(","):
item = item.strip()
if "-" not in item:
return None
if item.startswith("-"):
if last_end < 0:
return None
try:
begin = int(item)
except ValueError:
return None
end = None
last_end = -1
elif "-" in item:
begin, end = item.split("-", 1)
begin = begin.strip()
end = end.strip()
if not begin.isdigit():
return None
begin = int(begin)
if begin < last_end or last_end < 0:
return None
if end:
if not end.isdigit():
return None
end = int(end) + 1
if begin >= end:
return None
else:
end = None
last_end = end
ranges.append((begin, end))
return Range(units, ranges)
def parse_content_range_header(value, on_update=None):
"""Parses a range header into a
:class:`~werkzeug.datastructures.ContentRange` object or `None` if
parsing is not possible.
.. versionadded:: 0.7
:param value: a content range header to be parsed.
:param on_update: an optional callable that is called every time a value
on the :class:`~werkzeug.datastructures.ContentRange`
object is changed.
"""
if value is None:
return None
try:
units, rangedef = (value or "").strip().split(None, 1)
except ValueError:
return None
if "/" not in rangedef:
return None
rng, length = rangedef.split("/", 1)
if length == "*":
length = None
elif length.isdigit():
length = int(length)
else:
return None
if rng == "*":
return ContentRange(units, None, None, length, on_update=on_update)
elif "-" not in rng:
return None
start, stop = rng.split("-", 1)
try:
start = int(start)
stop = int(stop) + 1
except ValueError:
return None
if is_byte_range_valid(start, stop, length):
return ContentRange(units, start, stop, length, on_update=on_update)
def quote_etag(etag, weak=False):
"""Quote an etag.
:param etag: the etag to quote.
:param weak: set to `True` to tag it "weak".
"""
if '"' in etag:
raise ValueError("invalid etag")
etag = '"%s"' % etag
if weak:
etag = "W/" + etag
return etag
def unquote_etag(etag):
"""Unquote a single etag:
>>> unquote_etag('W/"bar"')
('bar', True)
>>> unquote_etag('"bar"')
('bar', False)
:param etag: the etag identifier to unquote.
:return: a ``(etag, weak)`` tuple.
"""
if not etag:
return None, None
etag = etag.strip()
weak = False
if etag.startswith(("W/", "w/")):
weak = True
etag = etag[2:]
if etag[:1] == etag[-1:] == '"':
etag = etag[1:-1]
return etag, weak
def parse_etags(value):
"""Parse an etag header.
:param value: the tag header to parse
:return: an :class:`~werkzeug.datastructures.ETags` object.
"""
if not value:
return ETags()
strong = []
weak = []
end = len(value)
pos = 0
while pos < end:
match = _etag_re.match(value, pos)
if match is None:
break
is_weak, quoted, raw = match.groups()
if raw == "*":
return ETags(star_tag=True)
elif quoted:
raw = quoted
if is_weak:
weak.append(raw)
else:
strong.append(raw)
pos = match.end()
return ETags(strong, weak)
def generate_etag(data):
"""Generate an etag for some data."""
return md5(data).hexdigest()
def parse_date(value):
"""Parse one of the following date formats into a datetime object:
.. sourcecode:: text
Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
If parsing fails the return value is `None`.
:param value: a string with a supported date format.
:return: a :class:`datetime.datetime` object.
"""
if value:
t = parsedate_tz(value.strip())
if t is not None:
try:
year = t[0]
# unfortunately that function does not tell us if two digit
# years were part of the string, or if they were prefixed
# with two zeroes. So what we do is to assume that 69-99
# refer to 1900, and everything below to 2000
if year >= 0 and year <= 68:
year += 2000
elif year >= 69 and year <= 99:
year += 1900
return datetime(*((year,) + t[1:7])) - timedelta(seconds=t[-1] or 0)
except (ValueError, OverflowError):
return None
def _dump_date(d, delim):
"""Used for `http_date` and `cookie_date`."""
if d is None:
d = gmtime()
elif isinstance(d, datetime):
d = d.utctimetuple()
elif isinstance(d, (integer_types, float)):
d = gmtime(d)
return "%s, %02d%s%s%s%04d %02d:%02d:%02d GMT" % (
("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun")[d.tm_wday],
d.tm_mday,
delim,
(
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec",
)[d.tm_mon - 1],
delim,
d.tm_year,
d.tm_hour,
d.tm_min,
d.tm_sec,
)
def cookie_date(expires=None):
"""Formats the time to ensure compatibility with Netscape's cookie
standard.
Accepts a floating point number expressed in seconds since the epoch in, a
datetime object or a timetuple. All times in UTC. The :func:`parse_date`
function can be used to parse such a date.
Outputs a string in the format ``Wdy, DD-Mon-YYYY HH:MM:SS GMT``.
:param expires: If provided that date is used, otherwise the current.
"""
return _dump_date(expires, "-")
def http_date(timestamp=None):
"""Formats the time to match the RFC1123 date format.
Accepts a floating point number expressed in seconds since the epoch in, a
datetime object or a timetuple. All times in UTC. The :func:`parse_date`
function can be used to parse such a date.
Outputs a string in the format ``Wdy, DD Mon YYYY HH:MM:SS GMT``.
:param timestamp: If provided that date is used, otherwise the current.
"""
return _dump_date(timestamp, " ")
def parse_age(value=None):
"""Parses a base-10 integer count of seconds into a timedelta.
If parsing fails, the return value is `None`.
:param value: a string consisting of an integer represented in base-10
:return: a :class:`datetime.timedelta` object or `None`.
"""
if not value:
return None
try:
seconds = int(value)
except ValueError:
return None
if seconds < 0:
return None
try:
return timedelta(seconds=seconds)
except OverflowError:
return None
def dump_age(age=None):
"""Formats the duration as a base-10 integer.
:param age: should be an integer number of seconds,
a :class:`datetime.timedelta` object, or,
if the age is unknown, `None` (default).
"""
if age is None:
return
if isinstance(age, timedelta):
# do the equivalent of Python 2.7's timedelta.total_seconds(),
# but disregarding fractional seconds
age = age.seconds + (age.days * 24 * 3600)
age = int(age)
if age < 0:
raise ValueError("age cannot be negative")
return str(age)
def is_resource_modified(
environ, etag=None, data=None, last_modified=None, ignore_if_range=True
):
"""Convenience method for conditional requests.
:param environ: the WSGI environment of the request to be checked.
:param etag: the etag for the response for comparison.
:param data: or alternatively the data of the response to automatically
generate an etag using :func:`generate_etag`.
:param last_modified: an optional date of the last modification.
:param ignore_if_range: If `False`, `If-Range` header will be taken into
account.
:return: `True` if the resource was modified, otherwise `False`.
.. versionchanged:: 1.0.0
The check is run for methods other than ``GET`` and ``HEAD``.
"""
if etag is None and data is not None:
etag = generate_etag(data)
elif data is not None:
raise TypeError("both data and etag given")
unmodified = False
if isinstance(last_modified, string_types):
last_modified = parse_date(last_modified)
# ensure that microsecond is zero because the HTTP spec does not transmit
# that either and we might have some false positives. See issue #39
if last_modified is not None:
last_modified = last_modified.replace(microsecond=0)
if_range = None
if not ignore_if_range and "HTTP_RANGE" in environ:
# https://tools.ietf.org/html/rfc7233#section-3.2
# A server MUST ignore an If-Range header field received in a request
# that does not contain a Range header field.
if_range = parse_if_range_header(environ.get("HTTP_IF_RANGE"))
if if_range is not None and if_range.date is not None:
modified_since = if_range.date
else:
modified_since = parse_date(environ.get("HTTP_IF_MODIFIED_SINCE"))
if modified_since and last_modified and last_modified <= modified_since:
unmodified = True
if etag:
etag, _ = unquote_etag(etag)
if if_range is not None and if_range.etag is not None:
unmodified = parse_etags(if_range.etag).contains(etag)
else:
if_none_match = parse_etags(environ.get("HTTP_IF_NONE_MATCH"))
if if_none_match:
# https://tools.ietf.org/html/rfc7232#section-3.2
# "A recipient MUST use the weak comparison function when comparing
# entity-tags for If-None-Match"
unmodified = if_none_match.contains_weak(etag)
# https://tools.ietf.org/html/rfc7232#section-3.1
# "Origin server MUST use the strong comparison function when
# comparing entity-tags for If-Match"
if_match = parse_etags(environ.get("HTTP_IF_MATCH"))
if if_match:
unmodified = not if_match.is_strong(etag)
return not unmodified
def remove_entity_headers(headers, allowed=("expires", "content-location")):
"""Remove all entity headers from a list or :class:`Headers` object. This
operation works in-place. `Expires` and `Content-Location` headers are
by default not removed. The reason for this is :rfc:`2616` section
10.3.5 which specifies some entity headers that should be sent.
.. versionchanged:: 0.5
added `allowed` parameter.
:param headers: a list or :class:`Headers` object.
:param allowed: a list of headers that should still be allowed even though
they are entity headers.
"""
allowed = set(x.lower() for x in allowed)
headers[:] = [
(key, value)
for key, value in headers
if not is_entity_header(key) or key.lower() in allowed
]
def remove_hop_by_hop_headers(headers):
"""Remove all HTTP/1.1 "Hop-by-Hop" headers from a list or
:class:`Headers` object. This operation works in-place.
.. versionadded:: 0.5
:param headers: a list or :class:`Headers` object.
"""
headers[:] = [
(key, value) for key, value in headers if not is_hop_by_hop_header(key)
]
def is_entity_header(header):
"""Check if a header is an entity header.
.. versionadded:: 0.5
:param header: the header to test.
:return: `True` if it's an entity header, `False` otherwise.
"""
return header.lower() in _entity_headers
def is_hop_by_hop_header(header):
"""Check if a header is an HTTP/1.1 "Hop-by-Hop" header.
.. versionadded:: 0.5
:param header: the header to test.
:return: `True` if it's an HTTP/1.1 "Hop-by-Hop" header, `False` otherwise.
"""
return header.lower() in _hop_by_hop_headers
def parse_cookie(header, charset="utf-8", errors="replace", cls=None):
"""Parse a cookie from a string or WSGI environ.
The same key can be provided multiple times, the values are stored
in-order. The default :class:`MultiDict` will have the first value
first, and all values can be retrieved with
:meth:`MultiDict.getlist`.
:param header: The cookie header as a string, or a WSGI environ dict
with a ``HTTP_COOKIE`` key.
:param charset: The charset for the cookie values.
:param errors: The error behavior for the charset decoding.
:param cls: A dict-like class to store the parsed cookies in.
Defaults to :class:`MultiDict`.
.. versionchanged:: 1.0.0
Returns a :class:`MultiDict` instead of a
``TypeConversionDict``.
.. versionchanged:: 0.5
Returns a :class:`TypeConversionDict` instead of a regular dict.
The ``cls`` parameter was added.
"""
if isinstance(header, dict):
header = header.get("HTTP_COOKIE", "")
elif header is None:
header = ""
# On Python 3, PEP 3333 sends headers through the environ as latin1
# decoded strings. Encode strings back to bytes for parsing.
if isinstance(header, text_type):
header = header.encode("latin1", "replace")
if cls is None:
cls = MultiDict
def _parse_pairs():
for key, val in _cookie_parse_impl(header):
key = to_unicode(key, charset, errors, allow_none_charset=True)
if not key:
continue
val = to_unicode(val, charset, errors, allow_none_charset=True)
yield try_coerce_native(key), val
return cls(_parse_pairs())
def dump_cookie(
key,
value="",
max_age=None,
expires=None,
path="/",
domain=None,
secure=False,
httponly=False,
charset="utf-8",
sync_expires=True,
max_size=4093,
samesite=None,
):
"""Creates a new Set-Cookie header without the ``Set-Cookie`` prefix
The parameters are the same as in the cookie Morsel object in the
Python standard library but it accepts unicode data, too.
On Python 3 the return value of this function will be a unicode
string, on Python 2 it will be a native string. In both cases the
return value is usually restricted to ascii as the vast majority of
values are properly escaped, but that is no guarantee. If a unicode
string is returned it's tunneled through latin1 as required by
PEP 3333.
The return value is not ASCII safe if the key contains unicode
characters. This is technically against the specification but
happens in the wild. It's strongly recommended to not use
non-ASCII values for the keys.
:param max_age: should be a number of seconds, or `None` (default) if
the cookie should last only as long as the client's
browser session. Additionally `timedelta` objects
are accepted, too.
:param expires: should be a `datetime` object or unix timestamp.
:param path: limits the cookie to a given path, per default it will
span the whole domain.
:param domain: Use this if you want to set a cross-domain cookie. For
example, ``domain=".example.com"`` will set a cookie
that is readable by the domain ``www.example.com``,
``foo.example.com`` etc. Otherwise, a cookie will only
be readable by the domain that set it.
:param secure: The cookie will only be available via HTTPS
:param httponly: disallow JavaScript to access the cookie. This is an
extension to the cookie standard and probably not
supported by all browsers.
:param charset: the encoding for unicode values.
:param sync_expires: automatically set expires if max_age is defined
but expires not.
:param max_size: Warn if the final header value exceeds this size. The
default, 4093, should be safely `supported by most browsers
<cookie_>`_. Set to 0 to disable this check.
:param samesite: Limits the scope of the cookie such that it will
only be attached to requests if those requests are same-site.
.. _`cookie`: http://browsercookielimits.squawky.net/
.. versionchanged:: 1.0.0
The string ``'None'`` is accepted for ``samesite``.
"""
key = to_bytes(key, charset)
value = to_bytes(value, charset)
if path is not None:
from .urls import iri_to_uri
path = iri_to_uri(path, charset)
domain = _make_cookie_domain(domain)
if isinstance(max_age, timedelta):
max_age = (max_age.days * 60 * 60 * 24) + max_age.seconds
if expires is not None:
if not isinstance(expires, string_types):
expires = cookie_date(expires)
elif max_age is not None and sync_expires:
expires = to_bytes(cookie_date(time() + max_age))
if samesite is not None:
samesite = samesite.title()
if samesite not in {"Strict", "Lax", "None"}:
raise ValueError("SameSite must be 'Strict', 'Lax', or 'None'.")
buf = [key + b"=" + _cookie_quote(value)]
# XXX: In theory all of these parameters that are not marked with `None`
# should be quoted. Because stdlib did not quote it before I did not
# want to introduce quoting there now.
for k, v, q in (
(b"Domain", domain, True),
(b"Expires", expires, False),
(b"Max-Age", max_age, False),
(b"Secure", secure, None),
(b"HttpOnly", httponly, None),
(b"Path", path, False),
(b"SameSite", samesite, False),
):
if q is None:
if v:
buf.append(k)
continue
if v is None:
continue
tmp = bytearray(k)
if not isinstance(v, (bytes, bytearray)):
v = to_bytes(text_type(v), charset)
if q:
v = _cookie_quote(v)
tmp += b"=" + v
buf.append(bytes(tmp))
# The return value will be an incorrectly encoded latin1 header on
# Python 3 for consistency with the headers object and a bytestring
# on Python 2 because that's how the API makes more sense.
rv = b"; ".join(buf)
if not PY2:
rv = rv.decode("latin1")
# Warn if the final value of the cookie is larger than the limit. If the
# cookie is too large, then it may be silently ignored by the browser,
# which can be quite hard to debug.
cookie_size = len(rv)
if max_size and cookie_size > max_size:
value_size = len(value)
warnings.warn(
'The "{key}" cookie is too large: the value was {value_size} bytes'
" but the header required {extra_size} extra bytes. The final size"
" was {cookie_size} bytes but the limit is {max_size} bytes."
" Browsers may silently ignore cookies larger than this.".format(
key=key,
value_size=value_size,
extra_size=cookie_size - value_size,
cookie_size=cookie_size,
max_size=max_size,
),
stacklevel=2,
)
return rv
def is_byte_range_valid(start, stop, length):
"""Checks if a given byte content range is valid for the given length.
.. versionadded:: 0.7
"""
if (start is None) != (stop is None):
return False
elif start is None:
return length is None or length >= 0
elif length is None:
return 0 <= start < stop
elif start >= stop:
return False
return 0 <= start < length
# circular dependencies
from .datastructures import Accept
from .datastructures import Authorization
from .datastructures import ContentRange
from .datastructures import ContentSecurityPolicy
from .datastructures import ETags
from .datastructures import HeaderSet
from .datastructures import IfRange
from .datastructures import MultiDict
from .datastructures import Range
from .datastructures import RequestCacheControl
from .datastructures import WWWAuthenticate
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/useragents.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.useragents
~~~~~~~~~~~~~~~~~~~
This module provides a helper to inspect user agent strings. This module
is far from complete but should work for most of the currently available
browsers.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import re
class UserAgentParser(object):
"""A simple user agent parser. Used by the `UserAgent`."""
platforms = (
(" cros ", "chromeos"),
("iphone|ios", "iphone"),
("ipad", "ipad"),
(r"darwin|mac|os\s*x", "macos"),
("win", "windows"),
(r"android", "android"),
("netbsd", "netbsd"),
("openbsd", "openbsd"),
("freebsd", "freebsd"),
("dragonfly", "dragonflybsd"),
("(sun|i86)os", "solaris"),
(r"x11|lin(\b|ux)?", "linux"),
(r"nintendo\s+wii", "wii"),
("irix", "irix"),
("hp-?ux", "hpux"),
("aix", "aix"),
("sco|unix_sv", "sco"),
("bsd", "bsd"),
("amiga", "amiga"),
("blackberry|playbook", "blackberry"),
("symbian", "symbian"),
)
browsers = (
("googlebot", "google"),
("msnbot", "msn"),
("yahoo", "yahoo"),
("ask jeeves", "ask"),
(r"aol|america\s+online\s+browser", "aol"),
(r"opera|opr", "opera"),
("edge", "edge"),
("chrome|crios", "chrome"),
("seamonkey", "seamonkey"),
("firefox|firebird|phoenix|iceweasel", "firefox"),
("galeon", "galeon"),
("safari|version", "safari"),
("webkit", "webkit"),
("camino", "camino"),
("konqueror", "konqueror"),
("k-meleon", "kmeleon"),
("netscape", "netscape"),
(r"msie|microsoft\s+internet\s+explorer|trident/.+? rv:", "msie"),
("lynx", "lynx"),
("links", "links"),
("Baiduspider", "baidu"),
("bingbot", "bing"),
("mozilla", "mozilla"),
)
_browser_version_re = r"(?:%s)[/\sa-z(]*(\d+[.\da-z]+)?"
_language_re = re.compile(
r"(?:;\s*|\s+)(\b\w{2}\b(?:-\b\w{2}\b)?)\s*;|"
r"(?:\(|\[|;)\s*(\b\w{2}\b(?:-\b\w{2}\b)?)\s*(?:\]|\)|;)"
)
def __init__(self):
self.platforms = [(b, re.compile(a, re.I)) for a, b in self.platforms]
self.browsers = [
(b, re.compile(self._browser_version_re % a, re.I))
for a, b in self.browsers
]
def __call__(self, user_agent):
for platform, regex in self.platforms: # noqa: B007
match = regex.search(user_agent)
if match is not None:
break
else:
platform = None
for browser, regex in self.browsers: # noqa: B007
match = regex.search(user_agent)
if match is not None:
version = match.group(1)
break
else:
browser = version = None
match = self._language_re.search(user_agent)
if match is not None:
language = match.group(1) or match.group(2)
else:
language = None
return platform, browser, version, language
class UserAgent(object):
"""Represents a user agent. Pass it a WSGI environment or a user agent
string and you can inspect some of the details from the user agent
string via the attributes. The following attributes exist:
.. attribute:: string
the raw user agent string
.. attribute:: platform
the browser platform. ``None`` if not recognized.
The following platforms are currently recognized:
- `aix`
- `amiga`
- `android`
- `blackberry`
- `bsd`
- `chromeos`
- `dragonflybsd`
- `freebsd`
- `hpux`
- `ipad`
- `iphone`
- `irix`
- `linux`
- `macos`
- `netbsd`
- `openbsd`
- `sco`
- `solaris`
- `symbian`
- `wii`
- `windows`
.. attribute:: browser
the name of the browser. ``None`` if not recognized.
The following browsers are currently recognized:
- `aol` *
- `ask` *
- `baidu` *
- `bing` *
- `camino`
- `chrome`
- `edge`
- `firefox`
- `galeon`
- `google` *
- `kmeleon`
- `konqueror`
- `links`
- `lynx`
- `mozilla`
- `msie`
- `msn`
- `netscape`
- `opera`
- `safari`
- `seamonkey`
- `webkit`
- `yahoo` *
(Browsers marked with a star (``*``) are crawlers.)
.. attribute:: version
the version of the browser. ``None`` if not recognized.
.. attribute:: language
the language of the browser. ``None`` if not recognized.
"""
_parser = UserAgentParser()
def __init__(self, environ_or_string):
if isinstance(environ_or_string, dict):
environ_or_string = environ_or_string.get("HTTP_USER_AGENT", "")
self.string = environ_or_string
self.platform, self.browser, self.version, self.language = self._parser(
environ_or_string
)
def to_header(self):
return self.string
def __str__(self):
return self.string
def __nonzero__(self):
return bool(self.browser)
__bool__ = __nonzero__
def __repr__(self):
return "<%s %r/%s>" % (self.__class__.__name__, self.browser, self.version)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/exceptions.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.exceptions
~~~~~~~~~~~~~~~~~~~
This module implements a number of Python exceptions you can raise from
within your views to trigger a standard non-200 response.
Usage Example
-------------
::
from werkzeug.wrappers import BaseRequest
from werkzeug.wsgi import responder
from werkzeug.exceptions import HTTPException, NotFound
def view(request):
raise NotFound()
@responder
def application(environ, start_response):
request = BaseRequest(environ)
try:
return view(request)
except HTTPException as e:
return e
As you can see from this example those exceptions are callable WSGI
applications. Because of Python 2.4 compatibility those do not extend
from the response objects but only from the python exception class.
As a matter of fact they are not Werkzeug response objects. However you
can get a response object by calling ``get_response()`` on a HTTP
exception.
Keep in mind that you have to pass an environment to ``get_response()``
because some errors fetch additional information from the WSGI
environment.
If you want to hook in a different exception page to say, a 404 status
code, you can add a second except for a specific subclass of an error::
@responder
def application(environ, start_response):
request = BaseRequest(environ)
try:
return view(request)
except NotFound, e:
return not_found(request)
except HTTPException, e:
return e
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import sys
from datetime import datetime
from ._compat import implements_to_string
from ._compat import integer_types
from ._compat import iteritems
from ._compat import text_type
from ._internal import _get_environ
from .utils import escape
@implements_to_string
class HTTPException(Exception):
"""Baseclass for all HTTP exceptions. This exception can be called as WSGI
application to render a default error page or you can catch the subclasses
of it independently and render nicer error messages.
"""
code = None
description = None
def __init__(self, description=None, response=None):
super(HTTPException, self).__init__()
if description is not None:
self.description = description
self.response = response
@classmethod
def wrap(cls, exception, name=None):
"""Create an exception that is a subclass of the calling HTTP
exception and the ``exception`` argument.
The first argument to the class will be passed to the
wrapped ``exception``, the rest to the HTTP exception. If
``e.args`` is not empty and ``e.show_exception`` is ``True``,
the wrapped exception message is added to the HTTP error
description.
.. versionchanged:: 0.15.5
The ``show_exception`` attribute controls whether the
description includes the wrapped exception message.
.. versionchanged:: 0.15.0
The description includes the wrapped exception message.
"""
class newcls(cls, exception):
_description = cls.description
show_exception = False
def __init__(self, arg=None, *args, **kwargs):
super(cls, self).__init__(*args, **kwargs)
if arg is None:
exception.__init__(self)
else:
exception.__init__(self, arg)
@property
def description(self):
if self.show_exception:
return "{}\n{}: {}".format(
self._description, exception.__name__, exception.__str__(self)
)
return self._description
@description.setter
def description(self, value):
self._description = value
newcls.__module__ = sys._getframe(1).f_globals.get("__name__")
name = name or cls.__name__ + exception.__name__
newcls.__name__ = newcls.__qualname__ = name
return newcls
@property
def name(self):
"""The status name."""
from .http import HTTP_STATUS_CODES
return HTTP_STATUS_CODES.get(self.code, "Unknown Error")
def get_description(self, environ=None):
"""Get the description."""
return u"<p>%s</p>" % escape(self.description).replace("\n", "<br>")
def get_body(self, environ=None):
"""Get the HTML body."""
return text_type(
(
u'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
u"<title>%(code)s %(name)s</title>\n"
u"<h1>%(name)s</h1>\n"
u"%(description)s\n"
)
% {
"code": self.code,
"name": escape(self.name),
"description": self.get_description(environ),
}
)
def get_headers(self, environ=None):
"""Get a list of headers."""
return [("Content-Type", "text/html; charset=utf-8")]
def get_response(self, environ=None):
"""Get a response object. If one was passed to the exception
it's returned directly.
:param environ: the optional environ for the request. This
can be used to modify the response depending
on how the request looked like.
:return: a :class:`Response` object or a subclass thereof.
"""
from .wrappers.response import Response
if self.response is not None:
return self.response
if environ is not None:
environ = _get_environ(environ)
headers = self.get_headers(environ)
return Response(self.get_body(environ), self.code, headers)
def __call__(self, environ, start_response):
"""Call the exception as WSGI application.
:param environ: the WSGI environment.
:param start_response: the response callable provided by the WSGI
server.
"""
response = self.get_response(environ)
return response(environ, start_response)
def __str__(self):
code = self.code if self.code is not None else "???"
return "%s %s: %s" % (code, self.name, self.description)
def __repr__(self):
code = self.code if self.code is not None else "???"
return "<%s '%s: %s'>" % (self.__class__.__name__, code, self.name)
class BadRequest(HTTPException):
"""*400* `Bad Request`
Raise if the browser sends something to the application the application
or server cannot handle.
"""
code = 400
description = (
"The browser (or proxy) sent a request that this server could "
"not understand."
)
class ClientDisconnected(BadRequest):
"""Internal exception that is raised if Werkzeug detects a disconnected
client. Since the client is already gone at that point attempting to
send the error message to the client might not work and might ultimately
result in another exception in the server. Mainly this is here so that
it is silenced by default as far as Werkzeug is concerned.
Since disconnections cannot be reliably detected and are unspecified
by WSGI to a large extent this might or might not be raised if a client
is gone.
.. versionadded:: 0.8
"""
class SecurityError(BadRequest):
"""Raised if something triggers a security error. This is otherwise
exactly like a bad request error.
.. versionadded:: 0.9
"""
class BadHost(BadRequest):
"""Raised if the submitted host is badly formatted.
.. versionadded:: 0.11.2
"""
class Unauthorized(HTTPException):
"""*401* ``Unauthorized``
Raise if the user is not authorized to access a resource.
The ``www_authenticate`` argument should be used to set the
``WWW-Authenticate`` header. This is used for HTTP basic auth and
other schemes. Use :class:`~werkzeug.datastructures.WWWAuthenticate`
to create correctly formatted values. Strictly speaking a 401
response is invalid if it doesn't provide at least one value for
this header, although real clients typically don't care.
:param description: Override the default message used for the body
of the response.
:param www-authenticate: A single value, or list of values, for the
WWW-Authenticate header.
.. versionchanged:: 0.15.3
If the ``www_authenticate`` argument is not set, the
``WWW-Authenticate`` header is not set.
.. versionchanged:: 0.15.3
The ``response`` argument was restored.
.. versionchanged:: 0.15.1
``description`` was moved back as the first argument, restoring
its previous position.
.. versionchanged:: 0.15.0
``www_authenticate`` was added as the first argument, ahead of
``description``.
"""
code = 401
description = (
"The server could not verify that you are authorized to access"
" the URL requested. You either supplied the wrong credentials"
" (e.g. a bad password), or your browser doesn't understand"
" how to supply the credentials required."
)
def __init__(self, description=None, response=None, www_authenticate=None):
HTTPException.__init__(self, description, response)
if www_authenticate is not None:
if not isinstance(www_authenticate, (tuple, list)):
www_authenticate = (www_authenticate,)
self.www_authenticate = www_authenticate
def get_headers(self, environ=None):
headers = HTTPException.get_headers(self, environ)
if self.www_authenticate:
headers.append(
("WWW-Authenticate", ", ".join([str(x) for x in self.www_authenticate]))
)
return headers
class Forbidden(HTTPException):
"""*403* `Forbidden`
Raise if the user doesn't have the permission for the requested resource
but was authenticated.
"""
code = 403
description = (
"You don't have the permission to access the requested"
" resource. It is either read-protected or not readable by the"
" server."
)
class NotFound(HTTPException):
"""*404* `Not Found`
Raise if a resource does not exist and never existed.
"""
code = 404
description = (
"The requested URL was not found on the server. If you entered"
" the URL manually please check your spelling and try again."
)
class MethodNotAllowed(HTTPException):
"""*405* `Method Not Allowed`
Raise if the server used a method the resource does not handle. For
example `POST` if the resource is view only. Especially useful for REST.
The first argument for this exception should be a list of allowed methods.
Strictly speaking the response would be invalid if you don't provide valid
methods in the header which you can do with that list.
"""
code = 405
description = "The method is not allowed for the requested URL."
def __init__(self, valid_methods=None, description=None):
"""Takes an optional list of valid http methods
starting with werkzeug 0.3 the list will be mandatory."""
HTTPException.__init__(self, description)
self.valid_methods = valid_methods
def get_headers(self, environ=None):
headers = HTTPException.get_headers(self, environ)
if self.valid_methods:
headers.append(("Allow", ", ".join(self.valid_methods)))
return headers
class NotAcceptable(HTTPException):
"""*406* `Not Acceptable`
Raise if the server can't return any content conforming to the
`Accept` headers of the client.
"""
code = 406
description = (
"The resource identified by the request is only capable of"
" generating response entities which have content"
" characteristics not acceptable according to the accept"
" headers sent in the request."
)
class RequestTimeout(HTTPException):
"""*408* `Request Timeout`
Raise to signalize a timeout.
"""
code = 408
description = (
"The server closed the network connection because the browser"
" didn't finish the request within the specified time."
)
class Conflict(HTTPException):
"""*409* `Conflict`
Raise to signal that a request cannot be completed because it conflicts
with the current state on the server.
.. versionadded:: 0.7
"""
code = 409
description = (
"A conflict happened while processing the request. The"
" resource might have been modified while the request was being"
" processed."
)
class Gone(HTTPException):
"""*410* `Gone`
Raise if a resource existed previously and went away without new location.
"""
code = 410
description = (
"The requested URL is no longer available on this server and"
" there is no forwarding address. If you followed a link from a"
" foreign page, please contact the author of this page."
)
class LengthRequired(HTTPException):
"""*411* `Length Required`
Raise if the browser submitted data but no ``Content-Length`` header which
is required for the kind of processing the server does.
"""
code = 411
description = (
"A request with this method requires a valid <code>Content-"
"Length</code> header."
)
class PreconditionFailed(HTTPException):
"""*412* `Precondition Failed`
Status code used in combination with ``If-Match``, ``If-None-Match``, or
``If-Unmodified-Since``.
"""
code = 412
description = (
"The precondition on the request for the URL failed positive evaluation."
)
class RequestEntityTooLarge(HTTPException):
"""*413* `Request Entity Too Large`
The status code one should return if the data submitted exceeded a given
limit.
"""
code = 413
description = "The data value transmitted exceeds the capacity limit."
class RequestURITooLarge(HTTPException):
"""*414* `Request URI Too Large`
Like *413* but for too long URLs.
"""
code = 414
description = (
"The length of the requested URL exceeds the capacity limit for"
" this server. The request cannot be processed."
)
class UnsupportedMediaType(HTTPException):
"""*415* `Unsupported Media Type`
The status code returned if the server is unable to handle the media type
the client transmitted.
"""
code = 415
description = (
"The server does not support the media type transmitted in the request."
)
class RequestedRangeNotSatisfiable(HTTPException):
"""*416* `Requested Range Not Satisfiable`
The client asked for an invalid part of the file.
.. versionadded:: 0.7
"""
code = 416
description = "The server cannot provide the requested range."
def __init__(self, length=None, units="bytes", description=None):
"""Takes an optional `Content-Range` header value based on ``length``
parameter.
"""
HTTPException.__init__(self, description)
self.length = length
self.units = units
def get_headers(self, environ=None):
headers = HTTPException.get_headers(self, environ)
if self.length is not None:
headers.append(("Content-Range", "%s */%d" % (self.units, self.length)))
return headers
class ExpectationFailed(HTTPException):
"""*417* `Expectation Failed`
The server cannot meet the requirements of the Expect request-header.
.. versionadded:: 0.7
"""
code = 417
description = "The server could not meet the requirements of the Expect header"
class ImATeapot(HTTPException):
"""*418* `I'm a teapot`
The server should return this if it is a teapot and someone attempted
to brew coffee with it.
.. versionadded:: 0.7
"""
code = 418
description = "This server is a teapot, not a coffee machine"
class UnprocessableEntity(HTTPException):
"""*422* `Unprocessable Entity`
Used if the request is well formed, but the instructions are otherwise
incorrect.
"""
code = 422
description = (
"The request was well-formed but was unable to be followed due"
" to semantic errors."
)
class Locked(HTTPException):
"""*423* `Locked`
Used if the resource that is being accessed is locked.
"""
code = 423
description = "The resource that is being accessed is locked."
class FailedDependency(HTTPException):
"""*424* `Failed Dependency`
Used if the method could not be performed on the resource
because the requested action depended on another action and that action failed.
"""
code = 424
description = (
"The method could not be performed on the resource because the"
" requested action depended on another action and that action"
" failed."
)
class PreconditionRequired(HTTPException):
"""*428* `Precondition Required`
The server requires this request to be conditional, typically to prevent
the lost update problem, which is a race condition between two or more
clients attempting to update a resource through PUT or DELETE. By requiring
each client to include a conditional header ("If-Match" or "If-Unmodified-
Since") with the proper value retained from a recent GET request, the
server ensures that each client has at least seen the previous revision of
the resource.
"""
code = 428
description = (
"This request is required to be conditional; try using"
' "If-Match" or "If-Unmodified-Since".'
)
class _RetryAfter(HTTPException):
"""Adds an optional ``retry_after`` parameter which will set the
``Retry-After`` header. May be an :class:`int` number of seconds or
a :class:`~datetime.datetime`.
"""
def __init__(self, description=None, response=None, retry_after=None):
super(_RetryAfter, self).__init__(description, response)
self.retry_after = retry_after
def get_headers(self, environ=None):
headers = super(_RetryAfter, self).get_headers(environ)
if self.retry_after:
if isinstance(self.retry_after, datetime):
from .http import http_date
value = http_date(self.retry_after)
else:
value = str(self.retry_after)
headers.append(("Retry-After", value))
return headers
class TooManyRequests(_RetryAfter):
"""*429* `Too Many Requests`
The server is limiting the rate at which this user receives
responses, and this request exceeds that rate. (The server may use
any convenient method to identify users and their request rates).
The server may include a "Retry-After" header to indicate how long
the user should wait before retrying.
:param retry_after: If given, set the ``Retry-After`` header to this
value. May be an :class:`int` number of seconds or a
:class:`~datetime.datetime`.
.. versionchanged:: 1.0
Added ``retry_after`` parameter.
"""
code = 429
description = "This user has exceeded an allotted request count. Try again later."
class RequestHeaderFieldsTooLarge(HTTPException):
"""*431* `Request Header Fields Too Large`
The server refuses to process the request because the header fields are too
large. One or more individual fields may be too large, or the set of all
headers is too large.
"""
code = 431
description = "One or more header fields exceeds the maximum size."
class UnavailableForLegalReasons(HTTPException):
"""*451* `Unavailable For Legal Reasons`
This status code indicates that the server is denying access to the
resource as a consequence of a legal demand.
"""
code = 451
description = "Unavailable for legal reasons."
class InternalServerError(HTTPException):
"""*500* `Internal Server Error`
Raise if an internal server error occurred. This is a good fallback if an
unknown error occurred in the dispatcher.
.. versionchanged:: 1.0.0
Added the :attr:`original_exception` attribute.
"""
code = 500
description = (
"The server encountered an internal error and was unable to"
" complete your request. Either the server is overloaded or"
" there is an error in the application."
)
def __init__(self, description=None, response=None, original_exception=None):
#: The original exception that caused this 500 error. Can be
#: used by frameworks to provide context when handling
#: unexpected errors.
self.original_exception = original_exception
super(InternalServerError, self).__init__(
description=description, response=response
)
class NotImplemented(HTTPException):
"""*501* `Not Implemented`
Raise if the application does not support the action requested by the
browser.
"""
code = 501
description = "The server does not support the action requested by the browser."
class BadGateway(HTTPException):
"""*502* `Bad Gateway`
If you do proxying in your application you should return this status code
if you received an invalid response from the upstream server it accessed
in attempting to fulfill the request.
"""
code = 502
description = (
"The proxy server received an invalid response from an upstream server."
)
class ServiceUnavailable(_RetryAfter):
"""*503* `Service Unavailable`
Status code you should return if a service is temporarily
unavailable.
:param retry_after: If given, set the ``Retry-After`` header to this
value. May be an :class:`int` number of seconds or a
:class:`~datetime.datetime`.
.. versionchanged:: 1.0
Added ``retry_after`` parameter.
"""
code = 503
description = (
"The server is temporarily unable to service your request due"
" to maintenance downtime or capacity problems. Please try"
" again later."
)
class GatewayTimeout(HTTPException):
"""*504* `Gateway Timeout`
Status code you should return if a connection to an upstream server
times out.
"""
code = 504
description = "The connection to an upstream server timed out."
class HTTPVersionNotSupported(HTTPException):
"""*505* `HTTP Version Not Supported`
The server does not support the HTTP protocol version used in the request.
"""
code = 505
description = (
"The server does not support the HTTP protocol version used in the request."
)
default_exceptions = {}
__all__ = ["HTTPException"]
def _find_exceptions():
for _name, obj in iteritems(globals()):
try:
is_http_exception = issubclass(obj, HTTPException)
except TypeError:
is_http_exception = False
if not is_http_exception or obj.code is None:
continue
__all__.append(obj.__name__)
old_obj = default_exceptions.get(obj.code, None)
if old_obj is not None and issubclass(obj, old_obj):
continue
default_exceptions[obj.code] = obj
_find_exceptions()
del _find_exceptions
class Aborter(object):
"""When passed a dict of code -> exception items it can be used as
callable that raises exceptions. If the first argument to the
callable is an integer it will be looked up in the mapping, if it's
a WSGI application it will be raised in a proxy exception.
The rest of the arguments are forwarded to the exception constructor.
"""
def __init__(self, mapping=None, extra=None):
if mapping is None:
mapping = default_exceptions
self.mapping = dict(mapping)
if extra is not None:
self.mapping.update(extra)
def __call__(self, code, *args, **kwargs):
if not args and not kwargs and not isinstance(code, integer_types):
raise HTTPException(response=code)
if code not in self.mapping:
raise LookupError("no exception for %r" % code)
raise self.mapping[code](*args, **kwargs)
def abort(status, *args, **kwargs):
"""Raises an :py:exc:`HTTPException` for the given status code or WSGI
application.
If a status code is given, it will be looked up in the list of
exceptions and will raise that exception. If passed a WSGI application,
it will wrap it in a proxy WSGI exception and raise that::
abort(404) # 404 Not Found
abort(Response('Hello World'))
"""
return _aborter(status, *args, **kwargs)
_aborter = Aborter()
#: An exception that is used to signal both a :exc:`KeyError` and a
#: :exc:`BadRequest`. Used by many of the datastructures.
BadRequestKeyError = BadRequest.wrap(KeyError)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/_compat.py
|
# flake8: noqa
# This whole file is full of lint errors
import functools
import operator
import sys
try:
import builtins
except ImportError:
import __builtin__ as builtins
PY2 = sys.version_info[0] == 2
WIN = sys.platform.startswith("win")
_identity = lambda x: x
if PY2:
unichr = unichr
text_type = unicode
string_types = (str, unicode)
integer_types = (int, long)
iterkeys = lambda d, *args, **kwargs: d.iterkeys(*args, **kwargs)
itervalues = lambda d, *args, **kwargs: d.itervalues(*args, **kwargs)
iteritems = lambda d, *args, **kwargs: d.iteritems(*args, **kwargs)
iterlists = lambda d, *args, **kwargs: d.iterlists(*args, **kwargs)
iterlistvalues = lambda d, *args, **kwargs: d.iterlistvalues(*args, **kwargs)
int_to_byte = chr
iter_bytes = iter
import collections as collections_abc
exec("def reraise(tp, value, tb=None):\n raise tp, value, tb")
def fix_tuple_repr(obj):
def __repr__(self):
cls = self.__class__
return "%s(%s)" % (
cls.__name__,
", ".join(
"%s=%r" % (field, self[index])
for index, field in enumerate(cls._fields)
),
)
obj.__repr__ = __repr__
return obj
def implements_iterator(cls):
cls.next = cls.__next__
del cls.__next__
return cls
def implements_to_string(cls):
cls.__unicode__ = cls.__str__
cls.__str__ = lambda x: x.__unicode__().encode("utf-8")
return cls
def native_string_result(func):
def wrapper(*args, **kwargs):
return func(*args, **kwargs).encode("utf-8")
return functools.update_wrapper(wrapper, func)
def implements_bool(cls):
cls.__nonzero__ = cls.__bool__
del cls.__bool__
return cls
from itertools import imap, izip, ifilter
range_type = xrange
from StringIO import StringIO
from cStringIO import StringIO as BytesIO
NativeStringIO = BytesIO
def make_literal_wrapper(reference):
return _identity
def normalize_string_tuple(tup):
"""Normalizes a string tuple to a common type. Following Python 2
rules, upgrades to unicode are implicit.
"""
if any(isinstance(x, text_type) for x in tup):
return tuple(to_unicode(x) for x in tup)
return tup
def try_coerce_native(s):
"""Try to coerce a unicode string to native if possible. Otherwise,
leave it as unicode.
"""
try:
return to_native(s)
except UnicodeError:
return s
wsgi_get_bytes = _identity
def wsgi_decoding_dance(s, charset="utf-8", errors="replace"):
return s.decode(charset, errors)
def wsgi_encoding_dance(s, charset="utf-8", errors="replace"):
if isinstance(s, bytes):
return s
return s.encode(charset, errors)
def to_bytes(x, charset=sys.getdefaultencoding(), errors="strict"):
if x is None:
return None
if isinstance(x, (bytes, bytearray, buffer)):
return bytes(x)
if isinstance(x, unicode):
return x.encode(charset, errors)
raise TypeError("Expected bytes")
def to_native(x, charset=sys.getdefaultencoding(), errors="strict"):
if x is None or isinstance(x, str):
return x
return x.encode(charset, errors)
else:
unichr = chr
text_type = str
string_types = (str,)
integer_types = (int,)
iterkeys = lambda d, *args, **kwargs: iter(d.keys(*args, **kwargs))
itervalues = lambda d, *args, **kwargs: iter(d.values(*args, **kwargs))
iteritems = lambda d, *args, **kwargs: iter(d.items(*args, **kwargs))
iterlists = lambda d, *args, **kwargs: iter(d.lists(*args, **kwargs))
iterlistvalues = lambda d, *args, **kwargs: iter(d.listvalues(*args, **kwargs))
int_to_byte = operator.methodcaller("to_bytes", 1, "big")
iter_bytes = functools.partial(map, int_to_byte)
import collections.abc as collections_abc
def reraise(tp, value, tb=None):
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
fix_tuple_repr = _identity
implements_iterator = _identity
implements_to_string = _identity
implements_bool = _identity
native_string_result = _identity
imap = map
izip = zip
ifilter = filter
range_type = range
from io import StringIO, BytesIO
NativeStringIO = StringIO
_latin1_encode = operator.methodcaller("encode", "latin1")
def make_literal_wrapper(reference):
if isinstance(reference, text_type):
return _identity
return _latin1_encode
def normalize_string_tuple(tup):
"""Ensures that all types in the tuple are either strings
or bytes.
"""
tupiter = iter(tup)
is_text = isinstance(next(tupiter, None), text_type)
for arg in tupiter:
if isinstance(arg, text_type) != is_text:
raise TypeError(
"Cannot mix str and bytes arguments (got %s)" % repr(tup)
)
return tup
try_coerce_native = _identity
wsgi_get_bytes = _latin1_encode
def wsgi_decoding_dance(s, charset="utf-8", errors="replace"):
return s.encode("latin1").decode(charset, errors)
def wsgi_encoding_dance(s, charset="utf-8", errors="replace"):
if isinstance(s, text_type):
s = s.encode(charset)
return s.decode("latin1", errors)
def to_bytes(x, charset=sys.getdefaultencoding(), errors="strict"):
if x is None:
return None
if isinstance(x, (bytes, bytearray, memoryview)): # noqa
return bytes(x)
if isinstance(x, str):
return x.encode(charset, errors)
raise TypeError("Expected bytes")
def to_native(x, charset=sys.getdefaultencoding(), errors="strict"):
if x is None or isinstance(x, str):
return x
return x.decode(charset, errors)
def to_unicode(
x, charset=sys.getdefaultencoding(), errors="strict", allow_none_charset=False
):
if x is None:
return None
if not isinstance(x, bytes):
return text_type(x)
if charset is None and allow_none_charset:
return x
return x.decode(charset, errors)
try:
from os import fspath
except ImportError:
# Python < 3.6
# https://www.python.org/dev/peps/pep-0519/#backwards-compatibility
def fspath(path):
return path.__fspath__() if hasattr(path, "__fspath__") else path
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/datastructures.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.datastructures
~~~~~~~~~~~~~~~~~~~~~~~
This module provides mixins and classes with an immutable interface.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import codecs
import mimetypes
import re
from copy import deepcopy
from itertools import repeat
from . import exceptions
from ._compat import BytesIO
from ._compat import collections_abc
from ._compat import fspath
from ._compat import integer_types
from ._compat import iteritems
from ._compat import iterkeys
from ._compat import iterlists
from ._compat import itervalues
from ._compat import make_literal_wrapper
from ._compat import PY2
from ._compat import string_types
from ._compat import text_type
from ._compat import to_native
from ._internal import _missing
from .filesystem import get_filesystem_encoding
def is_immutable(self):
raise TypeError("%r objects are immutable" % self.__class__.__name__)
def iter_multi_items(mapping):
"""Iterates over the items of a mapping yielding keys and values
without dropping any from more complex structures.
"""
if isinstance(mapping, MultiDict):
for item in iteritems(mapping, multi=True):
yield item
elif isinstance(mapping, dict):
for key, value in iteritems(mapping):
if isinstance(value, (tuple, list)):
for v in value:
yield key, v
else:
yield key, value
else:
for item in mapping:
yield item
def native_itermethods(names):
if not PY2:
return lambda x: x
def setviewmethod(cls, name):
viewmethod_name = "view%s" % name
repr_name = "view_%s" % name
def viewmethod(self, *a, **kw):
return ViewItems(self, name, repr_name, *a, **kw)
viewmethod.__name__ = viewmethod_name
viewmethod.__doc__ = "`%s()` object providing a view on %s" % (
viewmethod_name,
name,
)
setattr(cls, viewmethod_name, viewmethod)
def setitermethod(cls, name):
itermethod = getattr(cls, name)
setattr(cls, "iter%s" % name, itermethod)
def listmethod(self, *a, **kw):
return list(itermethod(self, *a, **kw))
listmethod.__name__ = name
listmethod.__doc__ = "Like :py:meth:`iter%s`, but returns a list." % name
setattr(cls, name, listmethod)
def wrap(cls):
for name in names:
setitermethod(cls, name)
setviewmethod(cls, name)
return cls
return wrap
class ImmutableListMixin(object):
"""Makes a :class:`list` immutable.
.. versionadded:: 0.5
:private:
"""
_hash_cache = None
def __hash__(self):
if self._hash_cache is not None:
return self._hash_cache
rv = self._hash_cache = hash(tuple(self))
return rv
def __reduce_ex__(self, protocol):
return type(self), (list(self),)
def __delitem__(self, key):
is_immutable(self)
def __iadd__(self, other):
is_immutable(self)
__imul__ = __iadd__
def __setitem__(self, key, value):
is_immutable(self)
def append(self, item):
is_immutable(self)
remove = append
def extend(self, iterable):
is_immutable(self)
def insert(self, pos, value):
is_immutable(self)
def pop(self, index=-1):
is_immutable(self)
def reverse(self):
is_immutable(self)
def sort(self, cmp=None, key=None, reverse=None):
is_immutable(self)
class ImmutableList(ImmutableListMixin, list):
"""An immutable :class:`list`.
.. versionadded:: 0.5
:private:
"""
def __repr__(self):
return "%s(%s)" % (self.__class__.__name__, list.__repr__(self))
class ImmutableDictMixin(object):
"""Makes a :class:`dict` immutable.
.. versionadded:: 0.5
:private:
"""
_hash_cache = None
@classmethod
def fromkeys(cls, keys, value=None):
instance = super(cls, cls).__new__(cls)
instance.__init__(zip(keys, repeat(value)))
return instance
def __reduce_ex__(self, protocol):
return type(self), (dict(self),)
def _iter_hashitems(self):
return iteritems(self)
def __hash__(self):
if self._hash_cache is not None:
return self._hash_cache
rv = self._hash_cache = hash(frozenset(self._iter_hashitems()))
return rv
def setdefault(self, key, default=None):
is_immutable(self)
def update(self, *args, **kwargs):
is_immutable(self)
def pop(self, key, default=None):
is_immutable(self)
def popitem(self):
is_immutable(self)
def __setitem__(self, key, value):
is_immutable(self)
def __delitem__(self, key):
is_immutable(self)
def clear(self):
is_immutable(self)
class ImmutableMultiDictMixin(ImmutableDictMixin):
"""Makes a :class:`MultiDict` immutable.
.. versionadded:: 0.5
:private:
"""
def __reduce_ex__(self, protocol):
return type(self), (list(iteritems(self, multi=True)),)
def _iter_hashitems(self):
return iteritems(self, multi=True)
def add(self, key, value):
is_immutable(self)
def popitemlist(self):
is_immutable(self)
def poplist(self, key):
is_immutable(self)
def setlist(self, key, new_list):
is_immutable(self)
def setlistdefault(self, key, default_list=None):
is_immutable(self)
class UpdateDictMixin(object):
"""Makes dicts call `self.on_update` on modifications.
.. versionadded:: 0.5
:private:
"""
on_update = None
def calls_update(name): # noqa: B902
def oncall(self, *args, **kw):
rv = getattr(super(UpdateDictMixin, self), name)(*args, **kw)
if self.on_update is not None:
self.on_update(self)
return rv
oncall.__name__ = name
return oncall
def setdefault(self, key, default=None):
modified = key not in self
rv = super(UpdateDictMixin, self).setdefault(key, default)
if modified and self.on_update is not None:
self.on_update(self)
return rv
def pop(self, key, default=_missing):
modified = key in self
if default is _missing:
rv = super(UpdateDictMixin, self).pop(key)
else:
rv = super(UpdateDictMixin, self).pop(key, default)
if modified and self.on_update is not None:
self.on_update(self)
return rv
__setitem__ = calls_update("__setitem__")
__delitem__ = calls_update("__delitem__")
clear = calls_update("clear")
popitem = calls_update("popitem")
update = calls_update("update")
del calls_update
class TypeConversionDict(dict):
"""Works like a regular dict but the :meth:`get` method can perform
type conversions. :class:`MultiDict` and :class:`CombinedMultiDict`
are subclasses of this class and provide the same feature.
.. versionadded:: 0.5
"""
def get(self, key, default=None, type=None):
"""Return the default value if the requested data doesn't exist.
If `type` is provided and is a callable it should convert the value,
return it or raise a :exc:`ValueError` if that is not possible. In
this case the function will return the default as if the value was not
found:
>>> d = TypeConversionDict(foo='42', bar='blub')
>>> d.get('foo', type=int)
42
>>> d.get('bar', -1, type=int)
-1
:param key: The key to be looked up.
:param default: The default value to be returned if the key can't
be looked up. If not further specified `None` is
returned.
:param type: A callable that is used to cast the value in the
:class:`MultiDict`. If a :exc:`ValueError` is raised
by this callable the default value is returned.
"""
try:
rv = self[key]
except KeyError:
return default
if type is not None:
try:
rv = type(rv)
except ValueError:
rv = default
return rv
class ImmutableTypeConversionDict(ImmutableDictMixin, TypeConversionDict):
"""Works like a :class:`TypeConversionDict` but does not support
modifications.
.. versionadded:: 0.5
"""
def copy(self):
"""Return a shallow mutable copy of this object. Keep in mind that
the standard library's :func:`copy` function is a no-op for this class
like for any other python immutable type (eg: :class:`tuple`).
"""
return TypeConversionDict(self)
def __copy__(self):
return self
class ViewItems(object):
def __init__(self, multi_dict, method, repr_name, *a, **kw):
self.__multi_dict = multi_dict
self.__method = method
self.__repr_name = repr_name
self.__a = a
self.__kw = kw
def __get_items(self):
return getattr(self.__multi_dict, self.__method)(*self.__a, **self.__kw)
def __repr__(self):
return "%s(%r)" % (self.__repr_name, list(self.__get_items()))
def __iter__(self):
return iter(self.__get_items())
@native_itermethods(["keys", "values", "items", "lists", "listvalues"])
class MultiDict(TypeConversionDict):
"""A :class:`MultiDict` is a dictionary subclass customized to deal with
multiple values for the same key which is for example used by the parsing
functions in the wrappers. This is necessary because some HTML form
elements pass multiple values for the same key.
:class:`MultiDict` implements all standard dictionary methods.
Internally, it saves all values for a key as a list, but the standard dict
access methods will only return the first value for a key. If you want to
gain access to the other values, too, you have to use the `list` methods as
explained below.
Basic Usage:
>>> d = MultiDict([('a', 'b'), ('a', 'c')])
>>> d
MultiDict([('a', 'b'), ('a', 'c')])
>>> d['a']
'b'
>>> d.getlist('a')
['b', 'c']
>>> 'a' in d
True
It behaves like a normal dict thus all dict functions will only return the
first value when multiple values for one key are found.
From Werkzeug 0.3 onwards, the `KeyError` raised by this class is also a
subclass of the :exc:`~exceptions.BadRequest` HTTP exception and will
render a page for a ``400 BAD REQUEST`` if caught in a catch-all for HTTP
exceptions.
A :class:`MultiDict` can be constructed from an iterable of
``(key, value)`` tuples, a dict, a :class:`MultiDict` or from Werkzeug 0.2
onwards some keyword parameters.
:param mapping: the initial value for the :class:`MultiDict`. Either a
regular dict, an iterable of ``(key, value)`` tuples
or `None`.
"""
def __init__(self, mapping=None):
if isinstance(mapping, MultiDict):
dict.__init__(self, ((k, l[:]) for k, l in iterlists(mapping)))
elif isinstance(mapping, dict):
tmp = {}
for key, value in iteritems(mapping):
if isinstance(value, (tuple, list)):
if len(value) == 0:
continue
value = list(value)
else:
value = [value]
tmp[key] = value
dict.__init__(self, tmp)
else:
tmp = {}
for key, value in mapping or ():
tmp.setdefault(key, []).append(value)
dict.__init__(self, tmp)
def __getstate__(self):
return dict(self.lists())
def __setstate__(self, value):
dict.clear(self)
dict.update(self, value)
def __getitem__(self, key):
"""Return the first data value for this key;
raises KeyError if not found.
:param key: The key to be looked up.
:raise KeyError: if the key does not exist.
"""
if key in self:
lst = dict.__getitem__(self, key)
if len(lst) > 0:
return lst[0]
raise exceptions.BadRequestKeyError(key)
def __setitem__(self, key, value):
"""Like :meth:`add` but removes an existing key first.
:param key: the key for the value.
:param value: the value to set.
"""
dict.__setitem__(self, key, [value])
def add(self, key, value):
"""Adds a new value for the key.
.. versionadded:: 0.6
:param key: the key for the value.
:param value: the value to add.
"""
dict.setdefault(self, key, []).append(value)
def getlist(self, key, type=None):
"""Return the list of items for a given key. If that key is not in the
`MultiDict`, the return value will be an empty list. Just as `get`
`getlist` accepts a `type` parameter. All items will be converted
with the callable defined there.
:param key: The key to be looked up.
:param type: A callable that is used to cast the value in the
:class:`MultiDict`. If a :exc:`ValueError` is raised
by this callable the value will be removed from the list.
:return: a :class:`list` of all the values for the key.
"""
try:
rv = dict.__getitem__(self, key)
except KeyError:
return []
if type is None:
return list(rv)
result = []
for item in rv:
try:
result.append(type(item))
except ValueError:
pass
return result
def setlist(self, key, new_list):
"""Remove the old values for a key and add new ones. Note that the list
you pass the values in will be shallow-copied before it is inserted in
the dictionary.
>>> d = MultiDict()
>>> d.setlist('foo', ['1', '2'])
>>> d['foo']
'1'
>>> d.getlist('foo')
['1', '2']
:param key: The key for which the values are set.
:param new_list: An iterable with the new values for the key. Old values
are removed first.
"""
dict.__setitem__(self, key, list(new_list))
def setdefault(self, key, default=None):
"""Returns the value for the key if it is in the dict, otherwise it
returns `default` and sets that value for `key`.
:param key: The key to be looked up.
:param default: The default value to be returned if the key is not
in the dict. If not further specified it's `None`.
"""
if key not in self:
self[key] = default
else:
default = self[key]
return default
def setlistdefault(self, key, default_list=None):
"""Like `setdefault` but sets multiple values. The list returned
is not a copy, but the list that is actually used internally. This
means that you can put new values into the dict by appending items
to the list:
>>> d = MultiDict({"foo": 1})
>>> d.setlistdefault("foo").extend([2, 3])
>>> d.getlist("foo")
[1, 2, 3]
:param key: The key to be looked up.
:param default_list: An iterable of default values. It is either copied
(in case it was a list) or converted into a list
before returned.
:return: a :class:`list`
"""
if key not in self:
default_list = list(default_list or ())
dict.__setitem__(self, key, default_list)
else:
default_list = dict.__getitem__(self, key)
return default_list
def items(self, multi=False):
"""Return an iterator of ``(key, value)`` pairs.
:param multi: If set to `True` the iterator returned will have a pair
for each value of each key. Otherwise it will only
contain pairs for the first value of each key.
"""
for key, values in iteritems(dict, self):
if multi:
for value in values:
yield key, value
else:
yield key, values[0]
def lists(self):
"""Return a iterator of ``(key, values)`` pairs, where values is the list
of all values associated with the key."""
for key, values in iteritems(dict, self):
yield key, list(values)
def keys(self):
return iterkeys(dict, self)
__iter__ = keys
def values(self):
"""Returns an iterator of the first value on every key's value list."""
for values in itervalues(dict, self):
yield values[0]
def listvalues(self):
"""Return an iterator of all values associated with a key. Zipping
:meth:`keys` and this is the same as calling :meth:`lists`:
>>> d = MultiDict({"foo": [1, 2, 3]})
>>> zip(d.keys(), d.listvalues()) == d.lists()
True
"""
return itervalues(dict, self)
def copy(self):
"""Return a shallow copy of this object."""
return self.__class__(self)
def deepcopy(self, memo=None):
"""Return a deep copy of this object."""
return self.__class__(deepcopy(self.to_dict(flat=False), memo))
def to_dict(self, flat=True):
"""Return the contents as regular dict. If `flat` is `True` the
returned dict will only have the first item present, if `flat` is
`False` all values will be returned as lists.
:param flat: If set to `False` the dict returned will have lists
with all the values in it. Otherwise it will only
contain the first value for each key.
:return: a :class:`dict`
"""
if flat:
return dict(iteritems(self))
return dict(self.lists())
def update(self, other_dict):
"""update() extends rather than replaces existing key lists:
>>> a = MultiDict({'x': 1})
>>> b = MultiDict({'x': 2, 'y': 3})
>>> a.update(b)
>>> a
MultiDict([('y', 3), ('x', 1), ('x', 2)])
If the value list for a key in ``other_dict`` is empty, no new values
will be added to the dict and the key will not be created:
>>> x = {'empty_list': []}
>>> y = MultiDict()
>>> y.update(x)
>>> y
MultiDict([])
"""
for key, value in iter_multi_items(other_dict):
MultiDict.add(self, key, value)
def pop(self, key, default=_missing):
"""Pop the first item for a list on the dict. Afterwards the
key is removed from the dict, so additional values are discarded:
>>> d = MultiDict({"foo": [1, 2, 3]})
>>> d.pop("foo")
1
>>> "foo" in d
False
:param key: the key to pop.
:param default: if provided the value to return if the key was
not in the dictionary.
"""
try:
lst = dict.pop(self, key)
if len(lst) == 0:
raise exceptions.BadRequestKeyError(key)
return lst[0]
except KeyError:
if default is not _missing:
return default
raise exceptions.BadRequestKeyError(key)
def popitem(self):
"""Pop an item from the dict."""
try:
item = dict.popitem(self)
if len(item[1]) == 0:
raise exceptions.BadRequestKeyError(item)
return (item[0], item[1][0])
except KeyError as e:
raise exceptions.BadRequestKeyError(e.args[0])
def poplist(self, key):
"""Pop the list for a key from the dict. If the key is not in the dict
an empty list is returned.
.. versionchanged:: 0.5
If the key does no longer exist a list is returned instead of
raising an error.
"""
return dict.pop(self, key, [])
def popitemlist(self):
"""Pop a ``(key, list)`` tuple from the dict."""
try:
return dict.popitem(self)
except KeyError as e:
raise exceptions.BadRequestKeyError(e.args[0])
def __copy__(self):
return self.copy()
def __deepcopy__(self, memo):
return self.deepcopy(memo=memo)
def __repr__(self):
return "%s(%r)" % (self.__class__.__name__, list(iteritems(self, multi=True)))
class _omd_bucket(object):
"""Wraps values in the :class:`OrderedMultiDict`. This makes it
possible to keep an order over multiple different keys. It requires
a lot of extra memory and slows down access a lot, but makes it
possible to access elements in O(1) and iterate in O(n).
"""
__slots__ = ("prev", "key", "value", "next")
def __init__(self, omd, key, value):
self.prev = omd._last_bucket
self.key = key
self.value = value
self.next = None
if omd._first_bucket is None:
omd._first_bucket = self
if omd._last_bucket is not None:
omd._last_bucket.next = self
omd._last_bucket = self
def unlink(self, omd):
if self.prev:
self.prev.next = self.next
if self.next:
self.next.prev = self.prev
if omd._first_bucket is self:
omd._first_bucket = self.next
if omd._last_bucket is self:
omd._last_bucket = self.prev
@native_itermethods(["keys", "values", "items", "lists", "listvalues"])
class OrderedMultiDict(MultiDict):
"""Works like a regular :class:`MultiDict` but preserves the
order of the fields. To convert the ordered multi dict into a
list you can use the :meth:`items` method and pass it ``multi=True``.
In general an :class:`OrderedMultiDict` is an order of magnitude
slower than a :class:`MultiDict`.
.. admonition:: note
Due to a limitation in Python you cannot convert an ordered
multi dict into a regular dict by using ``dict(multidict)``.
Instead you have to use the :meth:`to_dict` method, otherwise
the internal bucket objects are exposed.
"""
def __init__(self, mapping=None):
dict.__init__(self)
self._first_bucket = self._last_bucket = None
if mapping is not None:
OrderedMultiDict.update(self, mapping)
def __eq__(self, other):
if not isinstance(other, MultiDict):
return NotImplemented
if isinstance(other, OrderedMultiDict):
iter1 = iteritems(self, multi=True)
iter2 = iteritems(other, multi=True)
try:
for k1, v1 in iter1:
k2, v2 = next(iter2)
if k1 != k2 or v1 != v2:
return False
except StopIteration:
return False
try:
next(iter2)
except StopIteration:
return True
return False
if len(self) != len(other):
return False
for key, values in iterlists(self):
if other.getlist(key) != values:
return False
return True
__hash__ = None
def __ne__(self, other):
return not self.__eq__(other)
def __reduce_ex__(self, protocol):
return type(self), (list(iteritems(self, multi=True)),)
def __getstate__(self):
return list(iteritems(self, multi=True))
def __setstate__(self, values):
dict.clear(self)
for key, value in values:
self.add(key, value)
def __getitem__(self, key):
if key in self:
return dict.__getitem__(self, key)[0].value
raise exceptions.BadRequestKeyError(key)
def __setitem__(self, key, value):
self.poplist(key)
self.add(key, value)
def __delitem__(self, key):
self.pop(key)
def keys(self):
return (key for key, value in iteritems(self))
__iter__ = keys
def values(self):
return (value for key, value in iteritems(self))
def items(self, multi=False):
ptr = self._first_bucket
if multi:
while ptr is not None:
yield ptr.key, ptr.value
ptr = ptr.next
else:
returned_keys = set()
while ptr is not None:
if ptr.key not in returned_keys:
returned_keys.add(ptr.key)
yield ptr.key, ptr.value
ptr = ptr.next
def lists(self):
returned_keys = set()
ptr = self._first_bucket
while ptr is not None:
if ptr.key not in returned_keys:
yield ptr.key, self.getlist(ptr.key)
returned_keys.add(ptr.key)
ptr = ptr.next
def listvalues(self):
for _key, values in iterlists(self):
yield values
def add(self, key, value):
dict.setdefault(self, key, []).append(_omd_bucket(self, key, value))
def getlist(self, key, type=None):
try:
rv = dict.__getitem__(self, key)
except KeyError:
return []
if type is None:
return [x.value for x in rv]
result = []
for item in rv:
try:
result.append(type(item.value))
except ValueError:
pass
return result
def setlist(self, key, new_list):
self.poplist(key)
for value in new_list:
self.add(key, value)
def setlistdefault(self, key, default_list=None):
raise TypeError("setlistdefault is unsupported for ordered multi dicts")
def update(self, mapping):
for key, value in iter_multi_items(mapping):
OrderedMultiDict.add(self, key, value)
def poplist(self, key):
buckets = dict.pop(self, key, ())
for bucket in buckets:
bucket.unlink(self)
return [x.value for x in buckets]
def pop(self, key, default=_missing):
try:
buckets = dict.pop(self, key)
except KeyError:
if default is not _missing:
return default
raise exceptions.BadRequestKeyError(key)
for bucket in buckets:
bucket.unlink(self)
return buckets[0].value
def popitem(self):
try:
key, buckets = dict.popitem(self)
except KeyError as e:
raise exceptions.BadRequestKeyError(e.args[0])
for bucket in buckets:
bucket.unlink(self)
return key, buckets[0].value
def popitemlist(self):
try:
key, buckets = dict.popitem(self)
except KeyError as e:
raise exceptions.BadRequestKeyError(e.args[0])
for bucket in buckets:
bucket.unlink(self)
return key, [x.value for x in buckets]
def _options_header_vkw(value, kw):
return dump_options_header(
value, dict((k.replace("_", "-"), v) for k, v in kw.items())
)
def _unicodify_header_value(value):
if isinstance(value, bytes):
value = value.decode("latin-1")
if not isinstance(value, text_type):
value = text_type(value)
return value
@native_itermethods(["keys", "values", "items"])
class Headers(object):
"""An object that stores some headers. It has a dict-like interface
but is ordered and can store the same keys multiple times.
This data structure is useful if you want a nicer way to handle WSGI
headers which are stored as tuples in a list.
From Werkzeug 0.3 onwards, the :exc:`KeyError` raised by this class is
also a subclass of the :class:`~exceptions.BadRequest` HTTP exception
and will render a page for a ``400 BAD REQUEST`` if caught in a
catch-all for HTTP exceptions.
Headers is mostly compatible with the Python :class:`wsgiref.headers.Headers`
class, with the exception of `__getitem__`. :mod:`wsgiref` will return
`None` for ``headers['missing']``, whereas :class:`Headers` will raise
a :class:`KeyError`.
To create a new :class:`Headers` object pass it a list or dict of headers
which are used as default values. This does not reuse the list passed
to the constructor for internal usage.
:param defaults: The list of default values for the :class:`Headers`.
.. versionchanged:: 0.9
This data structure now stores unicode values similar to how the
multi dicts do it. The main difference is that bytes can be set as
well which will automatically be latin1 decoded.
.. versionchanged:: 0.9
The :meth:`linked` function was removed without replacement as it
was an API that does not support the changes to the encoding model.
"""
def __init__(self, defaults=None):
self._list = []
if defaults is not None:
if isinstance(defaults, (list, Headers)):
self._list.extend(defaults)
else:
self.extend(defaults)
def __getitem__(self, key, _get_mode=False):
if not _get_mode:
if isinstance(key, integer_types):
return self._list[key]
elif isinstance(key, slice):
return self.__class__(self._list[key])
if not isinstance(key, string_types):
raise exceptions.BadRequestKeyError(key)
ikey = key.lower()
for k, v in self._list:
if k.lower() == ikey:
return v
# micro optimization: if we are in get mode we will catch that
# exception one stack level down so we can raise a standard
# key error instead of our special one.
if _get_mode:
raise KeyError()
raise exceptions.BadRequestKeyError(key)
def __eq__(self, other):
def lowered(item):
return (item[0].lower(),) + item[1:]
return other.__class__ is self.__class__ and set(
map(lowered, other._list)
) == set(map(lowered, self._list))
__hash__ = None
def __ne__(self, other):
return not self.__eq__(other)
def get(self, key, default=None, type=None, as_bytes=False):
"""Return the default value if the requested data doesn't exist.
If `type` is provided and is a callable it should convert the value,
return it or raise a :exc:`ValueError` if that is not possible. In
this case the function will return the default as if the value was not
found:
>>> d = Headers([('Content-Length', '42')])
>>> d.get('Content-Length', type=int)
42
If a headers object is bound you must not add unicode strings
because no encoding takes place.
.. versionadded:: 0.9
Added support for `as_bytes`.
:param key: The key to be looked up.
:param default: The default value to be returned if the key can't
be looked up. If not further specified `None` is
returned.
:param type: A callable that is used to cast the value in the
:class:`Headers`. If a :exc:`ValueError` is raised
by this callable the default value is returned.
:param as_bytes: return bytes instead of unicode strings.
"""
try:
rv = self.__getitem__(key, _get_mode=True)
except KeyError:
return default
if as_bytes:
rv = rv.encode("latin1")
if type is None:
return rv
try:
return type(rv)
except ValueError:
return default
def getlist(self, key, type=None, as_bytes=False):
"""Return the list of items for a given key. If that key is not in the
:class:`Headers`, the return value will be an empty list. Just as
:meth:`get` :meth:`getlist` accepts a `type` parameter. All items will
be converted with the callable defined there.
.. versionadded:: 0.9
Added support for `as_bytes`.
:param key: The key to be looked up.
:param type: A callable that is used to cast the value in the
:class:`Headers`. If a :exc:`ValueError` is raised
by this callable the value will be removed from the list.
:return: a :class:`list` of all the values for the key.
:param as_bytes: return bytes instead of unicode strings.
"""
ikey = key.lower()
result = []
for k, v in self:
if k.lower() == ikey:
if as_bytes:
v = v.encode("latin1")
if type is not None:
try:
v = type(v)
except ValueError:
continue
result.append(v)
return result
def get_all(self, name):
"""Return a list of all the values for the named field.
This method is compatible with the :mod:`wsgiref`
:meth:`~wsgiref.headers.Headers.get_all` method.
"""
return self.getlist(name)
def items(self, lower=False):
for key, value in self:
if lower:
key = key.lower()
yield key, value
def keys(self, lower=False):
for key, _ in iteritems(self, lower):
yield key
def values(self):
for _, value in iteritems(self):
yield value
def extend(self, *args, **kwargs):
"""Extend headers in this object with items from another object
containing header items as well as keyword arguments.
To replace existing keys instead of extending, use
:meth:`update` instead.
If provided, the first argument can be another :class:`Headers`
object, a :class:`MultiDict`, :class:`dict`, or iterable of
pairs.
.. versionchanged:: 1.0
Support :class:`MultiDict`. Allow passing ``kwargs``.
"""
if len(args) > 1:
raise TypeError("update expected at most 1 arguments, got %d" % len(args))
if args:
for key, value in iter_multi_items(args[0]):
self.add(key, value)
for key, value in iter_multi_items(kwargs):
self.add(key, value)
def __delitem__(self, key, _index_operation=True):
if _index_operation and isinstance(key, (integer_types, slice)):
del self._list[key]
return
key = key.lower()
new = []
for k, v in self._list:
if k.lower() != key:
new.append((k, v))
self._list[:] = new
def remove(self, key):
"""Remove a key.
:param key: The key to be removed.
"""
return self.__delitem__(key, _index_operation=False)
def pop(self, key=None, default=_missing):
"""Removes and returns a key or index.
:param key: The key to be popped. If this is an integer the item at
that position is removed, if it's a string the value for
that key is. If the key is omitted or `None` the last
item is removed.
:return: an item.
"""
if key is None:
return self._list.pop()
if isinstance(key, integer_types):
return self._list.pop(key)
try:
rv = self[key]
self.remove(key)
except KeyError:
if default is not _missing:
return default
raise
return rv
def popitem(self):
"""Removes a key or index and returns a (key, value) item."""
return self.pop()
def __contains__(self, key):
"""Check if a key is present."""
try:
self.__getitem__(key, _get_mode=True)
except KeyError:
return False
return True
has_key = __contains__
def __iter__(self):
"""Yield ``(key, value)`` tuples."""
return iter(self._list)
def __len__(self):
return len(self._list)
def add(self, _key, _value, **kw):
"""Add a new header tuple to the list.
Keyword arguments can specify additional parameters for the header
value, with underscores converted to dashes::
>>> d = Headers()
>>> d.add('Content-Type', 'text/plain')
>>> d.add('Content-Disposition', 'attachment', filename='foo.png')
The keyword argument dumping uses :func:`dump_options_header`
behind the scenes.
.. versionadded:: 0.4.1
keyword arguments were added for :mod:`wsgiref` compatibility.
"""
if kw:
_value = _options_header_vkw(_value, kw)
_key = _unicodify_header_value(_key)
_value = _unicodify_header_value(_value)
self._validate_value(_value)
self._list.append((_key, _value))
def _validate_value(self, value):
if not isinstance(value, text_type):
raise TypeError("Value should be unicode.")
if u"\n" in value or u"\r" in value:
raise ValueError(
"Detected newline in header value. This is "
"a potential security problem"
)
def add_header(self, _key, _value, **_kw):
"""Add a new header tuple to the list.
An alias for :meth:`add` for compatibility with the :mod:`wsgiref`
:meth:`~wsgiref.headers.Headers.add_header` method.
"""
self.add(_key, _value, **_kw)
def clear(self):
"""Clears all headers."""
del self._list[:]
def set(self, _key, _value, **kw):
"""Remove all header tuples for `key` and add a new one. The newly
added key either appears at the end of the list if there was no
entry or replaces the first one.
Keyword arguments can specify additional parameters for the header
value, with underscores converted to dashes. See :meth:`add` for
more information.
.. versionchanged:: 0.6.1
:meth:`set` now accepts the same arguments as :meth:`add`.
:param key: The key to be inserted.
:param value: The value to be inserted.
"""
if kw:
_value = _options_header_vkw(_value, kw)
_key = _unicodify_header_value(_key)
_value = _unicodify_header_value(_value)
self._validate_value(_value)
if not self._list:
self._list.append((_key, _value))
return
listiter = iter(self._list)
ikey = _key.lower()
for idx, (old_key, _old_value) in enumerate(listiter):
if old_key.lower() == ikey:
# replace first occurrence
self._list[idx] = (_key, _value)
break
else:
self._list.append((_key, _value))
return
self._list[idx + 1 :] = [t for t in listiter if t[0].lower() != ikey]
def setlist(self, key, values):
"""Remove any existing values for a header and add new ones.
:param key: The header key to set.
:param values: An iterable of values to set for the key.
.. versionadded:: 1.0
"""
if values:
values_iter = iter(values)
self.set(key, next(values_iter))
for value in values_iter:
self.add(key, value)
else:
self.remove(key)
def setdefault(self, key, default):
"""Return the first value for the key if it is in the headers,
otherwise set the header to the value given by ``default`` and
return that.
:param key: The header key to get.
:param default: The value to set for the key if it is not in the
headers.
"""
if key in self:
return self[key]
self.set(key, default)
return default
def setlistdefault(self, key, default):
"""Return the list of values for the key if it is in the
headers, otherwise set the header to the list of values given
by ``default`` and return that.
Unlike :meth:`MultiDict.setlistdefault`, modifying the returned
list will not affect the headers.
:param key: The header key to get.
:param default: An iterable of values to set for the key if it
is not in the headers.
.. versionadded:: 1.0
"""
if key not in self:
self.setlist(key, default)
return self.getlist(key)
def __setitem__(self, key, value):
"""Like :meth:`set` but also supports index/slice based setting."""
if isinstance(key, (slice, integer_types)):
if isinstance(key, integer_types):
value = [value]
value = [
(_unicodify_header_value(k), _unicodify_header_value(v))
for (k, v) in value
]
[self._validate_value(v) for (k, v) in value]
if isinstance(key, integer_types):
self._list[key] = value[0]
else:
self._list[key] = value
else:
self.set(key, value)
def update(self, *args, **kwargs):
"""Replace headers in this object with items from another
headers object and keyword arguments.
To extend existing keys instead of replacing, use :meth:`extend`
instead.
If provided, the first argument can be another :class:`Headers`
object, a :class:`MultiDict`, :class:`dict`, or iterable of
pairs.
.. versionadded:: 1.0
"""
if len(args) > 1:
raise TypeError("update expected at most 1 arguments, got %d" % len(args))
if args:
mapping = args[0]
if isinstance(mapping, (Headers, MultiDict)):
for key in mapping.keys():
self.setlist(key, mapping.getlist(key))
elif isinstance(mapping, dict):
for key, value in iteritems(mapping):
if isinstance(value, (list, tuple)):
self.setlist(key, value)
else:
self.set(key, value)
else:
for key, value in mapping:
self.set(key, value)
for key, value in iteritems(kwargs):
if isinstance(value, (list, tuple)):
self.setlist(key, value)
else:
self.set(key, value)
def to_wsgi_list(self):
"""Convert the headers into a list suitable for WSGI.
The values are byte strings in Python 2 converted to latin1 and unicode
strings in Python 3 for the WSGI server to encode.
:return: list
"""
if PY2:
return [(to_native(k), v.encode("latin1")) for k, v in self]
return list(self)
def copy(self):
return self.__class__(self._list)
def __copy__(self):
return self.copy()
def __str__(self):
"""Returns formatted headers suitable for HTTP transmission."""
strs = []
for key, value in self.to_wsgi_list():
strs.append("%s: %s" % (key, value))
strs.append("\r\n")
return "\r\n".join(strs)
def __repr__(self):
return "%s(%r)" % (self.__class__.__name__, list(self))
class ImmutableHeadersMixin(object):
"""Makes a :class:`Headers` immutable. We do not mark them as
hashable though since the only usecase for this datastructure
in Werkzeug is a view on a mutable structure.
.. versionadded:: 0.5
:private:
"""
def __delitem__(self, key, **kwargs):
is_immutable(self)
def __setitem__(self, key, value):
is_immutable(self)
def set(self, key, value):
is_immutable(self)
def setlist(self, key, value):
is_immutable(self)
def add(self, item):
is_immutable(self)
def add_header(self, item):
is_immutable(self)
def remove(self, item):
is_immutable(self)
def extend(self, *args, **kwargs):
is_immutable(self)
def update(self, *args, **kwargs):
is_immutable(self)
def insert(self, pos, value):
is_immutable(self)
def pop(self, index=-1):
is_immutable(self)
def popitem(self):
is_immutable(self)
def setdefault(self, key, default):
is_immutable(self)
def setlistdefault(self, key, default):
is_immutable(self)
class EnvironHeaders(ImmutableHeadersMixin, Headers):
"""Read only version of the headers from a WSGI environment. This
provides the same interface as `Headers` and is constructed from
a WSGI environment.
From Werkzeug 0.3 onwards, the `KeyError` raised by this class is also a
subclass of the :exc:`~exceptions.BadRequest` HTTP exception and will
render a page for a ``400 BAD REQUEST`` if caught in a catch-all for
HTTP exceptions.
"""
def __init__(self, environ):
self.environ = environ
def __eq__(self, other):
return self.environ is other.environ
__hash__ = None
def __getitem__(self, key, _get_mode=False):
# _get_mode is a no-op for this class as there is no index but
# used because get() calls it.
if not isinstance(key, string_types):
raise KeyError(key)
key = key.upper().replace("-", "_")
if key in ("CONTENT_TYPE", "CONTENT_LENGTH"):
return _unicodify_header_value(self.environ[key])
return _unicodify_header_value(self.environ["HTTP_" + key])
def __len__(self):
# the iter is necessary because otherwise list calls our
# len which would call list again and so forth.
return len(list(iter(self)))
def __iter__(self):
for key, value in iteritems(self.environ):
if key.startswith("HTTP_") and key not in (
"HTTP_CONTENT_TYPE",
"HTTP_CONTENT_LENGTH",
):
yield (
key[5:].replace("_", "-").title(),
_unicodify_header_value(value),
)
elif key in ("CONTENT_TYPE", "CONTENT_LENGTH") and value:
yield (key.replace("_", "-").title(), _unicodify_header_value(value))
def copy(self):
raise TypeError("cannot create %r copies" % self.__class__.__name__)
@native_itermethods(["keys", "values", "items", "lists", "listvalues"])
class CombinedMultiDict(ImmutableMultiDictMixin, MultiDict):
"""A read only :class:`MultiDict` that you can pass multiple :class:`MultiDict`
instances as sequence and it will combine the return values of all wrapped
dicts:
>>> from werkzeug.datastructures import CombinedMultiDict, MultiDict
>>> post = MultiDict([('foo', 'bar')])
>>> get = MultiDict([('blub', 'blah')])
>>> combined = CombinedMultiDict([get, post])
>>> combined['foo']
'bar'
>>> combined['blub']
'blah'
This works for all read operations and will raise a `TypeError` for
methods that usually change data which isn't possible.
From Werkzeug 0.3 onwards, the `KeyError` raised by this class is also a
subclass of the :exc:`~exceptions.BadRequest` HTTP exception and will
render a page for a ``400 BAD REQUEST`` if caught in a catch-all for HTTP
exceptions.
"""
def __reduce_ex__(self, protocol):
return type(self), (self.dicts,)
def __init__(self, dicts=None):
self.dicts = dicts or []
@classmethod
def fromkeys(cls):
raise TypeError("cannot create %r instances by fromkeys" % cls.__name__)
def __getitem__(self, key):
for d in self.dicts:
if key in d:
return d[key]
raise exceptions.BadRequestKeyError(key)
def get(self, key, default=None, type=None):
for d in self.dicts:
if key in d:
if type is not None:
try:
return type(d[key])
except ValueError:
continue
return d[key]
return default
def getlist(self, key, type=None):
rv = []
for d in self.dicts:
rv.extend(d.getlist(key, type))
return rv
def _keys_impl(self):
"""This function exists so __len__ can be implemented more efficiently,
saving one list creation from an iterator.
Using this for Python 2's ``dict.keys`` behavior would be useless since
`dict.keys` in Python 2 returns a list, while we have a set here.
"""
rv = set()
for d in self.dicts:
rv.update(iterkeys(d))
return rv
def keys(self):
return iter(self._keys_impl())
__iter__ = keys
def items(self, multi=False):
found = set()
for d in self.dicts:
for key, value in iteritems(d, multi):
if multi:
yield key, value
elif key not in found:
found.add(key)
yield key, value
def values(self):
for _key, value in iteritems(self):
yield value
def lists(self):
rv = {}
for d in self.dicts:
for key, values in iterlists(d):
rv.setdefault(key, []).extend(values)
return iteritems(rv)
def listvalues(self):
return (x[1] for x in self.lists())
def copy(self):
"""Return a shallow mutable copy of this object.
This returns a :class:`MultiDict` representing the data at the
time of copying. The copy will no longer reflect changes to the
wrapped dicts.
.. versionchanged:: 0.15
Return a mutable :class:`MultiDict`.
"""
return MultiDict(self)
def to_dict(self, flat=True):
"""Return the contents as regular dict. If `flat` is `True` the
returned dict will only have the first item present, if `flat` is
`False` all values will be returned as lists.
:param flat: If set to `False` the dict returned will have lists
with all the values in it. Otherwise it will only
contain the first item for each key.
:return: a :class:`dict`
"""
rv = {}
for d in reversed(self.dicts):
rv.update(d.to_dict(flat))
return rv
def __len__(self):
return len(self._keys_impl())
def __contains__(self, key):
for d in self.dicts:
if key in d:
return True
return False
has_key = __contains__
def __repr__(self):
return "%s(%r)" % (self.__class__.__name__, self.dicts)
class FileMultiDict(MultiDict):
"""A special :class:`MultiDict` that has convenience methods to add
files to it. This is used for :class:`EnvironBuilder` and generally
useful for unittesting.
.. versionadded:: 0.5
"""
def add_file(self, name, file, filename=None, content_type=None):
"""Adds a new file to the dict. `file` can be a file name or
a :class:`file`-like or a :class:`FileStorage` object.
:param name: the name of the field.
:param file: a filename or :class:`file`-like object
:param filename: an optional filename
:param content_type: an optional content type
"""
if isinstance(file, FileStorage):
value = file
else:
if isinstance(file, string_types):
if filename is None:
filename = file
file = open(file, "rb")
if filename and content_type is None:
content_type = (
mimetypes.guess_type(filename)[0] or "application/octet-stream"
)
value = FileStorage(file, filename, name, content_type)
self.add(name, value)
class ImmutableDict(ImmutableDictMixin, dict):
"""An immutable :class:`dict`.
.. versionadded:: 0.5
"""
def __repr__(self):
return "%s(%s)" % (self.__class__.__name__, dict.__repr__(self))
def copy(self):
"""Return a shallow mutable copy of this object. Keep in mind that
the standard library's :func:`copy` function is a no-op for this class
like for any other python immutable type (eg: :class:`tuple`).
"""
return dict(self)
def __copy__(self):
return self
class ImmutableMultiDict(ImmutableMultiDictMixin, MultiDict):
"""An immutable :class:`MultiDict`.
.. versionadded:: 0.5
"""
def copy(self):
"""Return a shallow mutable copy of this object. Keep in mind that
the standard library's :func:`copy` function is a no-op for this class
like for any other python immutable type (eg: :class:`tuple`).
"""
return MultiDict(self)
def __copy__(self):
return self
class ImmutableOrderedMultiDict(ImmutableMultiDictMixin, OrderedMultiDict):
"""An immutable :class:`OrderedMultiDict`.
.. versionadded:: 0.6
"""
def _iter_hashitems(self):
return enumerate(iteritems(self, multi=True))
def copy(self):
"""Return a shallow mutable copy of this object. Keep in mind that
the standard library's :func:`copy` function is a no-op for this class
like for any other python immutable type (eg: :class:`tuple`).
"""
return OrderedMultiDict(self)
def __copy__(self):
return self
@native_itermethods(["values"])
class Accept(ImmutableList):
"""An :class:`Accept` object is just a list subclass for lists of
``(value, quality)`` tuples. It is automatically sorted by specificity
and quality.
All :class:`Accept` objects work similar to a list but provide extra
functionality for working with the data. Containment checks are
normalized to the rules of that header:
>>> a = CharsetAccept([('ISO-8859-1', 1), ('utf-8', 0.7)])
>>> a.best
'ISO-8859-1'
>>> 'iso-8859-1' in a
True
>>> 'UTF8' in a
True
>>> 'utf7' in a
False
To get the quality for an item you can use normal item lookup:
>>> print a['utf-8']
0.7
>>> a['utf7']
0
.. versionchanged:: 0.5
:class:`Accept` objects are forced immutable now.
.. versionchanged:: 1.0.0
:class:`Accept` internal values are no longer ordered
alphabetically for equal quality tags. Instead the initial
order is preserved.
"""
def __init__(self, values=()):
if values is None:
list.__init__(self)
self.provided = False
elif isinstance(values, Accept):
self.provided = values.provided
list.__init__(self, values)
else:
self.provided = True
values = sorted(
values, key=lambda x: (self._specificity(x[0]), x[1]), reverse=True,
)
list.__init__(self, values)
def _specificity(self, value):
"""Returns a tuple describing the value's specificity."""
return (value != "*",)
def _value_matches(self, value, item):
"""Check if a value matches a given accept item."""
return item == "*" or item.lower() == value.lower()
def __getitem__(self, key):
"""Besides index lookup (getting item n) you can also pass it a string
to get the quality for the item. If the item is not in the list, the
returned quality is ``0``.
"""
if isinstance(key, string_types):
return self.quality(key)
return list.__getitem__(self, key)
def quality(self, key):
"""Returns the quality of the key.
.. versionadded:: 0.6
In previous versions you had to use the item-lookup syntax
(eg: ``obj[key]`` instead of ``obj.quality(key)``)
"""
for item, quality in self:
if self._value_matches(key, item):
return quality
return 0
def __contains__(self, value):
for item, _quality in self:
if self._value_matches(value, item):
return True
return False
def __repr__(self):
return "%s([%s])" % (
self.__class__.__name__,
", ".join("(%r, %s)" % (x, y) for x, y in self),
)
def index(self, key):
"""Get the position of an entry or raise :exc:`ValueError`.
:param key: The key to be looked up.
.. versionchanged:: 0.5
This used to raise :exc:`IndexError`, which was inconsistent
with the list API.
"""
if isinstance(key, string_types):
for idx, (item, _quality) in enumerate(self):
if self._value_matches(key, item):
return idx
raise ValueError(key)
return list.index(self, key)
def find(self, key):
"""Get the position of an entry or return -1.
:param key: The key to be looked up.
"""
try:
return self.index(key)
except ValueError:
return -1
def values(self):
"""Iterate over all values."""
for item in self:
yield item[0]
def to_header(self):
"""Convert the header set into an HTTP header string."""
result = []
for value, quality in self:
if quality != 1:
value = "%s;q=%s" % (value, quality)
result.append(value)
return ",".join(result)
def __str__(self):
return self.to_header()
def _best_single_match(self, match):
for client_item, quality in self:
if self._value_matches(match, client_item):
# self is sorted by specificity descending, we can exit
return client_item, quality
def best_match(self, matches, default=None):
"""Returns the best match from a list of possible matches based
on the specificity and quality of the client. If two items have the
same quality and specificity, the one is returned that comes first.
:param matches: a list of matches to check for
:param default: the value that is returned if none match
"""
result = default
best_quality = -1
best_specificity = (-1,)
for server_item in matches:
match = self._best_single_match(server_item)
if not match:
continue
client_item, quality = match
specificity = self._specificity(client_item)
if quality <= 0 or quality < best_quality:
continue
# better quality or same quality but more specific => better match
if quality > best_quality or specificity > best_specificity:
result = server_item
best_quality = quality
best_specificity = specificity
return result
@property
def best(self):
"""The best match as value."""
if self:
return self[0][0]
_mime_split_re = re.compile(r"/|(?:\s*;\s*)")
def _normalize_mime(value):
return _mime_split_re.split(value.lower())
class MIMEAccept(Accept):
"""Like :class:`Accept` but with special methods and behavior for
mimetypes.
"""
def _specificity(self, value):
return tuple(x != "*" for x in _mime_split_re.split(value))
def _value_matches(self, value, item):
# item comes from the client, can't match if it's invalid.
if "/" not in item:
return False
# value comes from the application, tell the developer when it
# doesn't look valid.
if "/" not in value:
raise ValueError("invalid mimetype %r" % value)
# Split the match value into type, subtype, and a sorted list of parameters.
normalized_value = _normalize_mime(value)
value_type, value_subtype = normalized_value[:2]
value_params = sorted(normalized_value[2:])
# "*/*" is the only valid value that can start with "*".
if value_type == "*" and value_subtype != "*":
raise ValueError("invalid mimetype %r" % value)
# Split the accept item into type, subtype, and parameters.
normalized_item = _normalize_mime(item)
item_type, item_subtype = normalized_item[:2]
item_params = sorted(normalized_item[2:])
# "*/not-*" from the client is invalid, can't match.
if item_type == "*" and item_subtype != "*":
return False
return (
(item_type == "*" and item_subtype == "*")
or (value_type == "*" and value_subtype == "*")
) or (
item_type == value_type
and (
item_subtype == "*"
or value_subtype == "*"
or (item_subtype == value_subtype and item_params == value_params)
)
)
@property
def accept_html(self):
"""True if this object accepts HTML."""
return (
"text/html" in self or "application/xhtml+xml" in self or self.accept_xhtml
)
@property
def accept_xhtml(self):
"""True if this object accepts XHTML."""
return "application/xhtml+xml" in self or "application/xml" in self
@property
def accept_json(self):
"""True if this object accepts JSON."""
return "application/json" in self
_locale_delim_re = re.compile(r"[_-]")
def _normalize_lang(value):
"""Process a language tag for matching."""
return _locale_delim_re.split(value.lower())
class LanguageAccept(Accept):
"""Like :class:`Accept` but with normalization for language tags."""
def _value_matches(self, value, item):
return item == "*" or _normalize_lang(value) == _normalize_lang(item)
def best_match(self, matches, default=None):
"""Given a list of supported values, finds the best match from
the list of accepted values.
Language tags are normalized for the purpose of matching, but
are returned unchanged.
If no exact match is found, this will fall back to matching
the first subtag (primary language only), first with the
accepted values then with the match values. This partial is not
applied to any other language subtags.
The default is returned if no exact or fallback match is found.
:param matches: A list of supported languages to find a match.
:param default: The value that is returned if none match.
"""
# Look for an exact match first. If a client accepts "en-US",
# "en-US" is a valid match at this point.
result = super(LanguageAccept, self).best_match(matches)
if result is not None:
return result
# Fall back to accepting primary tags. If a client accepts
# "en-US", "en" is a valid match at this point. Need to use
# re.split to account for 2 or 3 letter codes.
fallback = Accept(
[(_locale_delim_re.split(item[0], 1)[0], item[1]) for item in self]
)
result = fallback.best_match(matches)
if result is not None:
return result
# Fall back to matching primary tags. If the client accepts
# "en", "en-US" is a valid match at this point.
fallback_matches = [_locale_delim_re.split(item, 1)[0] for item in matches]
result = super(LanguageAccept, self).best_match(fallback_matches)
# Return a value from the original match list. Find the first
# original value that starts with the matched primary tag.
if result is not None:
return next(item for item in matches if item.startswith(result))
return default
class CharsetAccept(Accept):
"""Like :class:`Accept` but with normalization for charsets."""
def _value_matches(self, value, item):
def _normalize(name):
try:
return codecs.lookup(name).name
except LookupError:
return name.lower()
return item == "*" or _normalize(value) == _normalize(item)
def cache_property(key, empty, type):
"""Return a new property object for a cache header. Useful if you
want to add support for a cache extension in a subclass."""
return property(
lambda x: x._get_cache_value(key, empty, type),
lambda x, v: x._set_cache_value(key, v, type),
lambda x: x._del_cache_value(key),
"accessor for %r" % key,
)
class _CacheControl(UpdateDictMixin, dict):
"""Subclass of a dict that stores values for a Cache-Control header. It
has accessors for all the cache-control directives specified in RFC 2616.
The class does not differentiate between request and response directives.
Because the cache-control directives in the HTTP header use dashes the
python descriptors use underscores for that.
To get a header of the :class:`CacheControl` object again you can convert
the object into a string or call the :meth:`to_header` method. If you plan
to subclass it and add your own items have a look at the sourcecode for
that class.
.. versionchanged:: 0.4
Setting `no_cache` or `private` to boolean `True` will set the implicit
none-value which is ``*``:
>>> cc = ResponseCacheControl()
>>> cc.no_cache = True
>>> cc
<ResponseCacheControl 'no-cache'>
>>> cc.no_cache
'*'
>>> cc.no_cache = None
>>> cc
<ResponseCacheControl ''>
In versions before 0.5 the behavior documented here affected the now
no longer existing `CacheControl` class.
"""
no_cache = cache_property("no-cache", "*", None)
no_store = cache_property("no-store", None, bool)
max_age = cache_property("max-age", -1, int)
no_transform = cache_property("no-transform", None, None)
def __init__(self, values=(), on_update=None):
dict.__init__(self, values or ())
self.on_update = on_update
self.provided = values is not None
def _get_cache_value(self, key, empty, type):
"""Used internally by the accessor properties."""
if type is bool:
return key in self
if key in self:
value = self[key]
if value is None:
return empty
elif type is not None:
try:
value = type(value)
except ValueError:
pass
return value
def _set_cache_value(self, key, value, type):
"""Used internally by the accessor properties."""
if type is bool:
if value:
self[key] = None
else:
self.pop(key, None)
else:
if value is None:
self.pop(key, None)
elif value is True:
self[key] = None
else:
self[key] = value
def _del_cache_value(self, key):
"""Used internally by the accessor properties."""
if key in self:
del self[key]
def to_header(self):
"""Convert the stored values into a cache control header."""
return dump_header(self)
def __str__(self):
return self.to_header()
def __repr__(self):
return "<%s %s>" % (
self.__class__.__name__,
" ".join("%s=%r" % (k, v) for k, v in sorted(self.items())),
)
class RequestCacheControl(ImmutableDictMixin, _CacheControl):
"""A cache control for requests. This is immutable and gives access
to all the request-relevant cache control headers.
To get a header of the :class:`RequestCacheControl` object again you can
convert the object into a string or call the :meth:`to_header` method. If
you plan to subclass it and add your own items have a look at the sourcecode
for that class.
.. versionadded:: 0.5
In previous versions a `CacheControl` class existed that was used
both for request and response.
"""
max_stale = cache_property("max-stale", "*", int)
min_fresh = cache_property("min-fresh", "*", int)
only_if_cached = cache_property("only-if-cached", None, bool)
class ResponseCacheControl(_CacheControl):
"""A cache control for responses. Unlike :class:`RequestCacheControl`
this is mutable and gives access to response-relevant cache control
headers.
To get a header of the :class:`ResponseCacheControl` object again you can
convert the object into a string or call the :meth:`to_header` method. If
you plan to subclass it and add your own items have a look at the sourcecode
for that class.
.. versionadded:: 0.5
In previous versions a `CacheControl` class existed that was used
both for request and response.
"""
public = cache_property("public", None, bool)
private = cache_property("private", "*", None)
must_revalidate = cache_property("must-revalidate", None, bool)
proxy_revalidate = cache_property("proxy-revalidate", None, bool)
s_maxage = cache_property("s-maxage", None, None)
immutable = cache_property("immutable", None, bool)
# attach cache_property to the _CacheControl as staticmethod
# so that others can reuse it.
_CacheControl.cache_property = staticmethod(cache_property)
def csp_property(key):
"""Return a new property object for a content security policy header.
Useful if you want to add support for a csp extension in a
subclass.
"""
return property(
lambda x: x._get_value(key),
lambda x, v: x._set_value(key, v),
lambda x: x._del_value(key),
"accessor for %r" % key,
)
class ContentSecurityPolicy(UpdateDictMixin, dict):
"""Subclass of a dict that stores values for a Content Security Policy
header. It has accessors for all the level 3 policies.
Because the csp directives in the HTTP header use dashes the
python descriptors use underscores for that.
To get a header of the :class:`ContentSecuirtyPolicy` object again
you can convert the object into a string or call the
:meth:`to_header` method. If you plan to subclass it and add your
own items have a look at the sourcecode for that class.
.. versionadded:: 1.0.0
Support for Content Security Policy headers was added.
"""
base_uri = csp_property("base-uri")
child_src = csp_property("child-src")
connect_src = csp_property("connect-src")
default_src = csp_property("default-src")
font_src = csp_property("font-src")
form_action = csp_property("form-action")
frame_ancestors = csp_property("frame-ancestors")
frame_src = csp_property("frame-src")
img_src = csp_property("img-src")
manifest_src = csp_property("manifest-src")
media_src = csp_property("media-src")
navigate_to = csp_property("navigate-to")
object_src = csp_property("object-src")
prefetch_src = csp_property("prefetch-src")
plugin_types = csp_property("plugin-types")
report_to = csp_property("report-to")
report_uri = csp_property("report-uri")
sandbox = csp_property("sandbox")
script_src = csp_property("script-src")
script_src_attr = csp_property("script-src-attr")
script_src_elem = csp_property("script-src-elem")
style_src = csp_property("style-src")
style_src_attr = csp_property("style-src-attr")
style_src_elem = csp_property("style-src-elem")
worker_src = csp_property("worker-src")
def __init__(self, values=(), on_update=None):
dict.__init__(self, values or ())
self.on_update = on_update
self.provided = values is not None
def _get_value(self, key):
"""Used internally by the accessor properties."""
return self.get(key)
def _set_value(self, key, value):
"""Used internally by the accessor properties."""
if value is None:
self.pop(key, None)
else:
self[key] = value
def _del_value(self, key):
"""Used internally by the accessor properties."""
if key in self:
del self[key]
def to_header(self):
"""Convert the stored values into a cache control header."""
return dump_csp_header(self)
def __str__(self):
return self.to_header()
def __repr__(self):
return "<%s %s>" % (
self.__class__.__name__,
" ".join("%s=%r" % (k, v) for k, v in sorted(self.items())),
)
class CallbackDict(UpdateDictMixin, dict):
"""A dict that calls a function passed every time something is changed.
The function is passed the dict instance.
"""
def __init__(self, initial=None, on_update=None):
dict.__init__(self, initial or ())
self.on_update = on_update
def __repr__(self):
return "<%s %s>" % (self.__class__.__name__, dict.__repr__(self))
class HeaderSet(collections_abc.MutableSet):
"""Similar to the :class:`ETags` class this implements a set-like structure.
Unlike :class:`ETags` this is case insensitive and used for vary, allow, and
content-language headers.
If not constructed using the :func:`parse_set_header` function the
instantiation works like this:
>>> hs = HeaderSet(['foo', 'bar', 'baz'])
>>> hs
HeaderSet(['foo', 'bar', 'baz'])
"""
def __init__(self, headers=None, on_update=None):
self._headers = list(headers or ())
self._set = set([x.lower() for x in self._headers])
self.on_update = on_update
def add(self, header):
"""Add a new header to the set."""
self.update((header,))
def remove(self, header):
"""Remove a header from the set. This raises an :exc:`KeyError` if the
header is not in the set.
.. versionchanged:: 0.5
In older versions a :exc:`IndexError` was raised instead of a
:exc:`KeyError` if the object was missing.
:param header: the header to be removed.
"""
key = header.lower()
if key not in self._set:
raise KeyError(header)
self._set.remove(key)
for idx, key in enumerate(self._headers):
if key.lower() == header:
del self._headers[idx]
break
if self.on_update is not None:
self.on_update(self)
def update(self, iterable):
"""Add all the headers from the iterable to the set.
:param iterable: updates the set with the items from the iterable.
"""
inserted_any = False
for header in iterable:
key = header.lower()
if key not in self._set:
self._headers.append(header)
self._set.add(key)
inserted_any = True
if inserted_any and self.on_update is not None:
self.on_update(self)
def discard(self, header):
"""Like :meth:`remove` but ignores errors.
:param header: the header to be discarded.
"""
try:
return self.remove(header)
except KeyError:
pass
def find(self, header):
"""Return the index of the header in the set or return -1 if not found.
:param header: the header to be looked up.
"""
header = header.lower()
for idx, item in enumerate(self._headers):
if item.lower() == header:
return idx
return -1
def index(self, header):
"""Return the index of the header in the set or raise an
:exc:`IndexError`.
:param header: the header to be looked up.
"""
rv = self.find(header)
if rv < 0:
raise IndexError(header)
return rv
def clear(self):
"""Clear the set."""
self._set.clear()
del self._headers[:]
if self.on_update is not None:
self.on_update(self)
def as_set(self, preserve_casing=False):
"""Return the set as real python set type. When calling this, all
the items are converted to lowercase and the ordering is lost.
:param preserve_casing: if set to `True` the items in the set returned
will have the original case like in the
:class:`HeaderSet`, otherwise they will
be lowercase.
"""
if preserve_casing:
return set(self._headers)
return set(self._set)
def to_header(self):
"""Convert the header set into an HTTP header string."""
return ", ".join(map(quote_header_value, self._headers))
def __getitem__(self, idx):
return self._headers[idx]
def __delitem__(self, idx):
rv = self._headers.pop(idx)
self._set.remove(rv.lower())
if self.on_update is not None:
self.on_update(self)
def __setitem__(self, idx, value):
old = self._headers[idx]
self._set.remove(old.lower())
self._headers[idx] = value
self._set.add(value.lower())
if self.on_update is not None:
self.on_update(self)
def __contains__(self, header):
return header.lower() in self._set
def __len__(self):
return len(self._set)
def __iter__(self):
return iter(self._headers)
def __nonzero__(self):
return bool(self._set)
def __str__(self):
return self.to_header()
def __repr__(self):
return "%s(%r)" % (self.__class__.__name__, self._headers)
class ETags(collections_abc.Container, collections_abc.Iterable):
"""A set that can be used to check if one etag is present in a collection
of etags.
"""
def __init__(self, strong_etags=None, weak_etags=None, star_tag=False):
self._strong = frozenset(not star_tag and strong_etags or ())
self._weak = frozenset(weak_etags or ())
self.star_tag = star_tag
def as_set(self, include_weak=False):
"""Convert the `ETags` object into a python set. Per default all the
weak etags are not part of this set."""
rv = set(self._strong)
if include_weak:
rv.update(self._weak)
return rv
def is_weak(self, etag):
"""Check if an etag is weak."""
return etag in self._weak
def is_strong(self, etag):
"""Check if an etag is strong."""
return etag in self._strong
def contains_weak(self, etag):
"""Check if an etag is part of the set including weak and strong tags."""
return self.is_weak(etag) or self.contains(etag)
def contains(self, etag):
"""Check if an etag is part of the set ignoring weak tags.
It is also possible to use the ``in`` operator.
"""
if self.star_tag:
return True
return self.is_strong(etag)
def contains_raw(self, etag):
"""When passed a quoted tag it will check if this tag is part of the
set. If the tag is weak it is checked against weak and strong tags,
otherwise strong only."""
etag, weak = unquote_etag(etag)
if weak:
return self.contains_weak(etag)
return self.contains(etag)
def to_header(self):
"""Convert the etags set into a HTTP header string."""
if self.star_tag:
return "*"
return ", ".join(
['"%s"' % x for x in self._strong] + ['W/"%s"' % x for x in self._weak]
)
def __call__(self, etag=None, data=None, include_weak=False):
if [etag, data].count(None) != 1:
raise TypeError("either tag or data required, but at least one")
if etag is None:
etag = generate_etag(data)
if include_weak:
if etag in self._weak:
return True
return etag in self._strong
def __bool__(self):
return bool(self.star_tag or self._strong or self._weak)
__nonzero__ = __bool__
def __str__(self):
return self.to_header()
def __iter__(self):
return iter(self._strong)
def __contains__(self, etag):
return self.contains(etag)
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, str(self))
class IfRange(object):
"""Very simple object that represents the `If-Range` header in parsed
form. It will either have neither a etag or date or one of either but
never both.
.. versionadded:: 0.7
"""
def __init__(self, etag=None, date=None):
#: The etag parsed and unquoted. Ranges always operate on strong
#: etags so the weakness information is not necessary.
self.etag = etag
#: The date in parsed format or `None`.
self.date = date
def to_header(self):
"""Converts the object back into an HTTP header."""
if self.date is not None:
return http_date(self.date)
if self.etag is not None:
return quote_etag(self.etag)
return ""
def __str__(self):
return self.to_header()
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, str(self))
class Range(object):
"""Represents a ``Range`` header. All methods only support only
bytes as the unit. Stores a list of ranges if given, but the methods
only work if only one range is provided.
:raise ValueError: If the ranges provided are invalid.
.. versionchanged:: 0.15
The ranges passed in are validated.
.. versionadded:: 0.7
"""
def __init__(self, units, ranges):
#: The units of this range. Usually "bytes".
self.units = units
#: A list of ``(begin, end)`` tuples for the range header provided.
#: The ranges are non-inclusive.
self.ranges = ranges
for start, end in ranges:
if start is None or (end is not None and (start < 0 or start >= end)):
raise ValueError("{} is not a valid range.".format((start, end)))
def range_for_length(self, length):
"""If the range is for bytes, the length is not None and there is
exactly one range and it is satisfiable it returns a ``(start, stop)``
tuple, otherwise `None`.
"""
if self.units != "bytes" or length is None or len(self.ranges) != 1:
return None
start, end = self.ranges[0]
if end is None:
end = length
if start < 0:
start += length
if is_byte_range_valid(start, end, length):
return start, min(end, length)
def make_content_range(self, length):
"""Creates a :class:`~werkzeug.datastructures.ContentRange` object
from the current range and given content length.
"""
rng = self.range_for_length(length)
if rng is not None:
return ContentRange(self.units, rng[0], rng[1], length)
def to_header(self):
"""Converts the object back into an HTTP header."""
ranges = []
for begin, end in self.ranges:
if end is None:
ranges.append("%s-" % begin if begin >= 0 else str(begin))
else:
ranges.append("%s-%s" % (begin, end - 1))
return "%s=%s" % (self.units, ",".join(ranges))
def to_content_range_header(self, length):
"""Converts the object into `Content-Range` HTTP header,
based on given length
"""
range_for_length = self.range_for_length(length)
if range_for_length is not None:
return "%s %d-%d/%d" % (
self.units,
range_for_length[0],
range_for_length[1] - 1,
length,
)
return None
def __str__(self):
return self.to_header()
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, str(self))
class ContentRange(object):
"""Represents the content range header.
.. versionadded:: 0.7
"""
def __init__(self, units, start, stop, length=None, on_update=None):
assert is_byte_range_valid(start, stop, length), "Bad range provided"
self.on_update = on_update
self.set(start, stop, length, units)
def _callback_property(name): # noqa: B902
def fget(self):
return getattr(self, name)
def fset(self, value):
setattr(self, name, value)
if self.on_update is not None:
self.on_update(self)
return property(fget, fset)
#: The units to use, usually "bytes"
units = _callback_property("_units")
#: The start point of the range or `None`.
start = _callback_property("_start")
#: The stop point of the range (non-inclusive) or `None`. Can only be
#: `None` if also start is `None`.
stop = _callback_property("_stop")
#: The length of the range or `None`.
length = _callback_property("_length")
del _callback_property
def set(self, start, stop, length=None, units="bytes"):
"""Simple method to update the ranges."""
assert is_byte_range_valid(start, stop, length), "Bad range provided"
self._units = units
self._start = start
self._stop = stop
self._length = length
if self.on_update is not None:
self.on_update(self)
def unset(self):
"""Sets the units to `None` which indicates that the header should
no longer be used.
"""
self.set(None, None, units=None)
def to_header(self):
if self.units is None:
return ""
if self.length is None:
length = "*"
else:
length = self.length
if self.start is None:
return "%s */%s" % (self.units, length)
return "%s %s-%s/%s" % (self.units, self.start, self.stop - 1, length)
def __nonzero__(self):
return self.units is not None
__bool__ = __nonzero__
def __str__(self):
return self.to_header()
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, str(self))
class Authorization(ImmutableDictMixin, dict):
"""Represents an `Authorization` header sent by the client. You should
not create this kind of object yourself but use it when it's returned by
the `parse_authorization_header` function.
This object is a dict subclass and can be altered by setting dict items
but it should be considered immutable as it's returned by the client and
not meant for modifications.
.. versionchanged:: 0.5
This object became immutable.
"""
def __init__(self, auth_type, data=None):
dict.__init__(self, data or {})
self.type = auth_type
@property
def username(self):
"""The username transmitted. This is set for both basic and digest
auth all the time.
"""
return self.get("username")
@property
def password(self):
"""When the authentication type is basic this is the password
transmitted by the client, else `None`.
"""
return self.get("password")
@property
def realm(self):
"""This is the server realm sent back for HTTP digest auth."""
return self.get("realm")
@property
def nonce(self):
"""The nonce the server sent for digest auth, sent back by the client.
A nonce should be unique for every 401 response for HTTP digest auth.
"""
return self.get("nonce")
@property
def uri(self):
"""The URI from Request-URI of the Request-Line; duplicated because
proxies are allowed to change the Request-Line in transit. HTTP
digest auth only.
"""
return self.get("uri")
@property
def nc(self):
"""The nonce count value transmitted by clients if a qop-header is
also transmitted. HTTP digest auth only.
"""
return self.get("nc")
@property
def cnonce(self):
"""If the server sent a qop-header in the ``WWW-Authenticate``
header, the client has to provide this value for HTTP digest auth.
See the RFC for more details.
"""
return self.get("cnonce")
@property
def response(self):
"""A string of 32 hex digits computed as defined in RFC 2617, which
proves that the user knows a password. Digest auth only.
"""
return self.get("response")
@property
def opaque(self):
"""The opaque header from the server returned unchanged by the client.
It is recommended that this string be base64 or hexadecimal data.
Digest auth only.
"""
return self.get("opaque")
@property
def qop(self):
"""Indicates what "quality of protection" the client has applied to
the message for HTTP digest auth. Note that this is a single token,
not a quoted list of alternatives as in WWW-Authenticate.
"""
return self.get("qop")
class WWWAuthenticate(UpdateDictMixin, dict):
"""Provides simple access to `WWW-Authenticate` headers."""
#: list of keys that require quoting in the generated header
_require_quoting = frozenset(["domain", "nonce", "opaque", "realm", "qop"])
def __init__(self, auth_type=None, values=None, on_update=None):
dict.__init__(self, values or ())
if auth_type:
self["__auth_type__"] = auth_type
self.on_update = on_update
def set_basic(self, realm="authentication required"):
"""Clear the auth info and enable basic auth."""
dict.clear(self)
dict.update(self, {"__auth_type__": "basic", "realm": realm})
if self.on_update:
self.on_update(self)
def set_digest(
self, realm, nonce, qop=("auth",), opaque=None, algorithm=None, stale=False
):
"""Clear the auth info and enable digest auth."""
d = {
"__auth_type__": "digest",
"realm": realm,
"nonce": nonce,
"qop": dump_header(qop),
}
if stale:
d["stale"] = "TRUE"
if opaque is not None:
d["opaque"] = opaque
if algorithm is not None:
d["algorithm"] = algorithm
dict.clear(self)
dict.update(self, d)
if self.on_update:
self.on_update(self)
def to_header(self):
"""Convert the stored values into a WWW-Authenticate header."""
d = dict(self)
auth_type = d.pop("__auth_type__", None) or "basic"
return "%s %s" % (
auth_type.title(),
", ".join(
[
"%s=%s"
% (
key,
quote_header_value(
value, allow_token=key not in self._require_quoting
),
)
for key, value in iteritems(d)
]
),
)
def __str__(self):
return self.to_header()
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, self.to_header())
def auth_property(name, doc=None): # noqa: B902
"""A static helper function for subclasses to add extra authentication
system properties onto a class::
class FooAuthenticate(WWWAuthenticate):
special_realm = auth_property('special_realm')
For more information have a look at the sourcecode to see how the
regular properties (:attr:`realm` etc.) are implemented.
"""
def _set_value(self, value):
if value is None:
self.pop(name, None)
else:
self[name] = str(value)
return property(lambda x: x.get(name), _set_value, doc=doc)
def _set_property(name, doc=None): # noqa: B902
def fget(self):
def on_update(header_set):
if not header_set and name in self:
del self[name]
elif header_set:
self[name] = header_set.to_header()
return parse_set_header(self.get(name), on_update)
return property(fget, doc=doc)
type = auth_property(
"__auth_type__",
doc="""The type of the auth mechanism. HTTP currently specifies
``Basic`` and ``Digest``.""",
)
realm = auth_property(
"realm",
doc="""A string to be displayed to users so they know which
username and password to use. This string should contain at
least the name of the host performing the authentication and
might additionally indicate the collection of users who might
have access.""",
)
domain = _set_property(
"domain",
doc="""A list of URIs that define the protection space. If a URI
is an absolute path, it is relative to the canonical root URL of
the server being accessed.""",
)
nonce = auth_property(
"nonce",
doc="""
A server-specified data string which should be uniquely generated
each time a 401 response is made. It is recommended that this
string be base64 or hexadecimal data.""",
)
opaque = auth_property(
"opaque",
doc="""A string of data, specified by the server, which should
be returned by the client unchanged in the Authorization header
of subsequent requests with URIs in the same protection space.
It is recommended that this string be base64 or hexadecimal
data.""",
)
algorithm = auth_property(
"algorithm",
doc="""A string indicating a pair of algorithms used to produce
the digest and a checksum. If this is not present it is assumed
to be "MD5". If the algorithm is not understood, the challenge
should be ignored (and a different one used, if there is more
than one).""",
)
qop = _set_property(
"qop",
doc="""A set of quality-of-privacy directives such as auth and
auth-int.""",
)
@property
def stale(self):
"""A flag, indicating that the previous request from the client
was rejected because the nonce value was stale.
"""
val = self.get("stale")
if val is not None:
return val.lower() == "true"
@stale.setter
def stale(self, value):
if value is None:
self.pop("stale", None)
else:
self["stale"] = "TRUE" if value else "FALSE"
auth_property = staticmethod(auth_property)
del _set_property
class FileStorage(object):
"""The :class:`FileStorage` class is a thin wrapper over incoming files.
It is used by the request object to represent uploaded files. All the
attributes of the wrapper stream are proxied by the file storage so
it's possible to do ``storage.read()`` instead of the long form
``storage.stream.read()``.
"""
def __init__(
self,
stream=None,
filename=None,
name=None,
content_type=None,
content_length=None,
headers=None,
):
self.name = name
self.stream = stream or BytesIO()
# if no filename is provided we can attempt to get the filename
# from the stream object passed. There we have to be careful to
# skip things like <fdopen>, <stderr> etc. Python marks these
# special filenames with angular brackets.
if filename is None:
filename = getattr(stream, "name", None)
s = make_literal_wrapper(filename)
if filename and filename[0] == s("<") and filename[-1] == s(">"):
filename = None
# On Python 3 we want to make sure the filename is always unicode.
# This might not be if the name attribute is bytes due to the
# file being opened from the bytes API.
if not PY2 and isinstance(filename, bytes):
filename = filename.decode(get_filesystem_encoding(), "replace")
self.filename = filename
if headers is None:
headers = Headers()
self.headers = headers
if content_type is not None:
headers["Content-Type"] = content_type
if content_length is not None:
headers["Content-Length"] = str(content_length)
def _parse_content_type(self):
if not hasattr(self, "_parsed_content_type"):
self._parsed_content_type = parse_options_header(self.content_type)
@property
def content_type(self):
"""The content-type sent in the header. Usually not available"""
return self.headers.get("content-type")
@property
def content_length(self):
"""The content-length sent in the header. Usually not available"""
return int(self.headers.get("content-length") or 0)
@property
def mimetype(self):
"""Like :attr:`content_type`, but without parameters (eg, without
charset, type etc.) and always lowercase. For example if the content
type is ``text/HTML; charset=utf-8`` the mimetype would be
``'text/html'``.
.. versionadded:: 0.7
"""
self._parse_content_type()
return self._parsed_content_type[0].lower()
@property
def mimetype_params(self):
"""The mimetype parameters as dict. For example if the content
type is ``text/html; charset=utf-8`` the params would be
``{'charset': 'utf-8'}``.
.. versionadded:: 0.7
"""
self._parse_content_type()
return self._parsed_content_type[1]
def save(self, dst, buffer_size=16384):
"""Save the file to a destination path or file object. If the
destination is a file object you have to close it yourself after the
call. The buffer size is the number of bytes held in memory during
the copy process. It defaults to 16KB.
For secure file saving also have a look at :func:`secure_filename`.
:param dst: a filename, :class:`os.PathLike`, or open file
object to write to.
:param buffer_size: Passed as the ``length`` parameter of
:func:`shutil.copyfileobj`.
.. versionchanged:: 1.0
Supports :mod:`pathlib`.
"""
from shutil import copyfileobj
close_dst = False
if hasattr(dst, "__fspath__"):
dst = fspath(dst)
if isinstance(dst, string_types):
dst = open(dst, "wb")
close_dst = True
try:
copyfileobj(self.stream, dst, buffer_size)
finally:
if close_dst:
dst.close()
def close(self):
"""Close the underlying file if possible."""
try:
self.stream.close()
except Exception:
pass
def __nonzero__(self):
return bool(self.filename)
__bool__ = __nonzero__
def __getattr__(self, name):
try:
return getattr(self.stream, name)
except AttributeError:
# SpooledTemporaryFile doesn't implement IOBase, get the
# attribute from its backing file instead.
# https://github.com/python/cpython/pull/3249
if hasattr(self.stream, "_file"):
return getattr(self.stream._file, name)
raise
def __iter__(self):
return iter(self.stream)
def __repr__(self):
return "<%s: %r (%r)>" % (
self.__class__.__name__,
self.filename,
self.content_type,
)
# circular dependencies
from .http import dump_csp_header
from .http import dump_header
from .http import dump_options_header
from .http import generate_etag
from .http import http_date
from .http import is_byte_range_valid
from .http import parse_options_header
from .http import parse_set_header
from .http import quote_etag
from .http import quote_header_value
from .http import unquote_etag
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/urls.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.urls
~~~~~~~~~~~~~
``werkzeug.urls`` used to provide several wrapper functions for Python 2
urlparse, whose main purpose were to work around the behavior of the Py2
stdlib and its lack of unicode support. While this was already a somewhat
inconvenient situation, it got even more complicated because Python 3's
``urllib.parse`` actually does handle unicode properly. In other words,
this module would wrap two libraries with completely different behavior. So
now this module contains a 2-and-3-compatible backport of Python 3's
``urllib.parse``, which is mostly API-compatible.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import codecs
import os
import re
from collections import namedtuple
from ._compat import fix_tuple_repr
from ._compat import implements_to_string
from ._compat import make_literal_wrapper
from ._compat import normalize_string_tuple
from ._compat import PY2
from ._compat import text_type
from ._compat import to_native
from ._compat import to_unicode
from ._compat import try_coerce_native
from ._internal import _decode_idna
from ._internal import _encode_idna
# A regular expression for what a valid schema looks like
_scheme_re = re.compile(r"^[a-zA-Z0-9+-.]+$")
# Characters that are safe in any part of an URL.
_always_safe = frozenset(
bytearray(
b"abcdefghijklmnopqrstuvwxyz"
b"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
b"0123456789"
b"-._~"
)
)
_hexdigits = "0123456789ABCDEFabcdef"
_hextobyte = dict(
((a + b).encode(), int(a + b, 16)) for a in _hexdigits for b in _hexdigits
)
_bytetohex = [("%%%02X" % char).encode("ascii") for char in range(256)]
_URLTuple = fix_tuple_repr(
namedtuple("_URLTuple", ["scheme", "netloc", "path", "query", "fragment"])
)
class BaseURL(_URLTuple):
"""Superclass of :py:class:`URL` and :py:class:`BytesURL`."""
__slots__ = ()
def replace(self, **kwargs):
"""Return an URL with the same values, except for those parameters
given new values by whichever keyword arguments are specified."""
return self._replace(**kwargs)
@property
def host(self):
"""The host part of the URL if available, otherwise `None`. The
host is either the hostname or the IP address mentioned in the
URL. It will not contain the port.
"""
return self._split_host()[0]
@property
def ascii_host(self):
"""Works exactly like :attr:`host` but will return a result that
is restricted to ASCII. If it finds a netloc that is not ASCII
it will attempt to idna decode it. This is useful for socket
operations when the URL might include internationalized characters.
"""
rv = self.host
if rv is not None and isinstance(rv, text_type):
try:
rv = _encode_idna(rv)
except UnicodeError:
rv = rv.encode("ascii", "ignore")
return to_native(rv, "ascii", "ignore")
@property
def port(self):
"""The port in the URL as an integer if it was present, `None`
otherwise. This does not fill in default ports.
"""
try:
rv = int(to_native(self._split_host()[1]))
if 0 <= rv <= 65535:
return rv
except (ValueError, TypeError):
pass
@property
def auth(self):
"""The authentication part in the URL if available, `None`
otherwise.
"""
return self._split_netloc()[0]
@property
def username(self):
"""The username if it was part of the URL, `None` otherwise.
This undergoes URL decoding and will always be a unicode string.
"""
rv = self._split_auth()[0]
if rv is not None:
return _url_unquote_legacy(rv)
@property
def raw_username(self):
"""The username if it was part of the URL, `None` otherwise.
Unlike :attr:`username` this one is not being decoded.
"""
return self._split_auth()[0]
@property
def password(self):
"""The password if it was part of the URL, `None` otherwise.
This undergoes URL decoding and will always be a unicode string.
"""
rv = self._split_auth()[1]
if rv is not None:
return _url_unquote_legacy(rv)
@property
def raw_password(self):
"""The password if it was part of the URL, `None` otherwise.
Unlike :attr:`password` this one is not being decoded.
"""
return self._split_auth()[1]
def decode_query(self, *args, **kwargs):
"""Decodes the query part of the URL. Ths is a shortcut for
calling :func:`url_decode` on the query argument. The arguments and
keyword arguments are forwarded to :func:`url_decode` unchanged.
"""
return url_decode(self.query, *args, **kwargs)
def join(self, *args, **kwargs):
"""Joins this URL with another one. This is just a convenience
function for calling into :meth:`url_join` and then parsing the
return value again.
"""
return url_parse(url_join(self, *args, **kwargs))
def to_url(self):
"""Returns a URL string or bytes depending on the type of the
information stored. This is just a convenience function
for calling :meth:`url_unparse` for this URL.
"""
return url_unparse(self)
def decode_netloc(self):
"""Decodes the netloc part into a string."""
rv = _decode_idna(self.host or "")
if ":" in rv:
rv = "[%s]" % rv
port = self.port
if port is not None:
rv = "%s:%d" % (rv, port)
auth = ":".join(
filter(
None,
[
_url_unquote_legacy(self.raw_username or "", "/:%@"),
_url_unquote_legacy(self.raw_password or "", "/:%@"),
],
)
)
if auth:
rv = "%s@%s" % (auth, rv)
return rv
def to_uri_tuple(self):
"""Returns a :class:`BytesURL` tuple that holds a URI. This will
encode all the information in the URL properly to ASCII using the
rules a web browser would follow.
It's usually more interesting to directly call :meth:`iri_to_uri` which
will return a string.
"""
return url_parse(iri_to_uri(self).encode("ascii"))
def to_iri_tuple(self):
"""Returns a :class:`URL` tuple that holds a IRI. This will try
to decode as much information as possible in the URL without
losing information similar to how a web browser does it for the
URL bar.
It's usually more interesting to directly call :meth:`uri_to_iri` which
will return a string.
"""
return url_parse(uri_to_iri(self))
def get_file_location(self, pathformat=None):
"""Returns a tuple with the location of the file in the form
``(server, location)``. If the netloc is empty in the URL or
points to localhost, it's represented as ``None``.
The `pathformat` by default is autodetection but needs to be set
when working with URLs of a specific system. The supported values
are ``'windows'`` when working with Windows or DOS paths and
``'posix'`` when working with posix paths.
If the URL does not point to a local file, the server and location
are both represented as ``None``.
:param pathformat: The expected format of the path component.
Currently ``'windows'`` and ``'posix'`` are
supported. Defaults to ``None`` which is
autodetect.
"""
if self.scheme != "file":
return None, None
path = url_unquote(self.path)
host = self.netloc or None
if pathformat is None:
if os.name == "nt":
pathformat = "windows"
else:
pathformat = "posix"
if pathformat == "windows":
if path[:1] == "/" and path[1:2].isalpha() and path[2:3] in "|:":
path = path[1:2] + ":" + path[3:]
windows_share = path[:3] in ("\\" * 3, "/" * 3)
import ntpath
path = ntpath.normpath(path)
# Windows shared drives are represented as ``\\host\\directory``.
# That results in a URL like ``file://///host/directory``, and a
# path like ``///host/directory``. We need to special-case this
# because the path contains the hostname.
if windows_share and host is None:
parts = path.lstrip("\\").split("\\", 1)
if len(parts) == 2:
host, path = parts
else:
host = parts[0]
path = ""
elif pathformat == "posix":
import posixpath
path = posixpath.normpath(path)
else:
raise TypeError("Invalid path format %s" % repr(pathformat))
if host in ("127.0.0.1", "::1", "localhost"):
host = None
return host, path
def _split_netloc(self):
if self._at in self.netloc:
return self.netloc.split(self._at, 1)
return None, self.netloc
def _split_auth(self):
auth = self._split_netloc()[0]
if not auth:
return None, None
if self._colon not in auth:
return auth, None
return auth.split(self._colon, 1)
def _split_host(self):
rv = self._split_netloc()[1]
if not rv:
return None, None
if not rv.startswith(self._lbracket):
if self._colon in rv:
return rv.split(self._colon, 1)
return rv, None
idx = rv.find(self._rbracket)
if idx < 0:
return rv, None
host = rv[1:idx]
rest = rv[idx + 1 :]
if rest.startswith(self._colon):
return host, rest[1:]
return host, None
@implements_to_string
class URL(BaseURL):
"""Represents a parsed URL. This behaves like a regular tuple but
also has some extra attributes that give further insight into the
URL.
"""
__slots__ = ()
_at = "@"
_colon = ":"
_lbracket = "["
_rbracket = "]"
def __str__(self):
return self.to_url()
def encode_netloc(self):
"""Encodes the netloc part to an ASCII safe URL as bytes."""
rv = self.ascii_host or ""
if ":" in rv:
rv = "[%s]" % rv
port = self.port
if port is not None:
rv = "%s:%d" % (rv, port)
auth = ":".join(
filter(
None,
[
url_quote(self.raw_username or "", "utf-8", "strict", "/:%"),
url_quote(self.raw_password or "", "utf-8", "strict", "/:%"),
],
)
)
if auth:
rv = "%s@%s" % (auth, rv)
return to_native(rv)
def encode(self, charset="utf-8", errors="replace"):
"""Encodes the URL to a tuple made out of bytes. The charset is
only being used for the path, query and fragment.
"""
return BytesURL(
self.scheme.encode("ascii"),
self.encode_netloc(),
self.path.encode(charset, errors),
self.query.encode(charset, errors),
self.fragment.encode(charset, errors),
)
class BytesURL(BaseURL):
"""Represents a parsed URL in bytes."""
__slots__ = ()
_at = b"@"
_colon = b":"
_lbracket = b"["
_rbracket = b"]"
def __str__(self):
return self.to_url().decode("utf-8", "replace")
def encode_netloc(self):
"""Returns the netloc unchanged as bytes."""
return self.netloc
def decode(self, charset="utf-8", errors="replace"):
"""Decodes the URL to a tuple made out of strings. The charset is
only being used for the path, query and fragment.
"""
return URL(
self.scheme.decode("ascii"),
self.decode_netloc(),
self.path.decode(charset, errors),
self.query.decode(charset, errors),
self.fragment.decode(charset, errors),
)
_unquote_maps = {frozenset(): _hextobyte}
def _unquote_to_bytes(string, unsafe=""):
if isinstance(string, text_type):
string = string.encode("utf-8")
if isinstance(unsafe, text_type):
unsafe = unsafe.encode("utf-8")
unsafe = frozenset(bytearray(unsafe))
groups = iter(string.split(b"%"))
result = bytearray(next(groups, b""))
try:
hex_to_byte = _unquote_maps[unsafe]
except KeyError:
hex_to_byte = _unquote_maps[unsafe] = {
h: b for h, b in _hextobyte.items() if b not in unsafe
}
for group in groups:
code = group[:2]
if code in hex_to_byte:
result.append(hex_to_byte[code])
result.extend(group[2:])
else:
result.append(37) # %
result.extend(group)
return bytes(result)
def _url_encode_impl(obj, charset, encode_keys, sort, key):
from .datastructures import iter_multi_items
iterable = iter_multi_items(obj)
if sort:
iterable = sorted(iterable, key=key)
for key, value in iterable:
if value is None:
continue
if not isinstance(key, bytes):
key = text_type(key).encode(charset)
if not isinstance(value, bytes):
value = text_type(value).encode(charset)
yield _fast_url_quote_plus(key) + "=" + _fast_url_quote_plus(value)
def _url_unquote_legacy(value, unsafe=""):
try:
return url_unquote(value, charset="utf-8", errors="strict", unsafe=unsafe)
except UnicodeError:
return url_unquote(value, charset="latin1", unsafe=unsafe)
def url_parse(url, scheme=None, allow_fragments=True):
"""Parses a URL from a string into a :class:`URL` tuple. If the URL
is lacking a scheme it can be provided as second argument. Otherwise,
it is ignored. Optionally fragments can be stripped from the URL
by setting `allow_fragments` to `False`.
The inverse of this function is :func:`url_unparse`.
:param url: the URL to parse.
:param scheme: the default schema to use if the URL is schemaless.
:param allow_fragments: if set to `False` a fragment will be removed
from the URL.
"""
s = make_literal_wrapper(url)
is_text_based = isinstance(url, text_type)
if scheme is None:
scheme = s("")
netloc = query = fragment = s("")
i = url.find(s(":"))
if i > 0 and _scheme_re.match(to_native(url[:i], errors="replace")):
# make sure "iri" is not actually a port number (in which case
# "scheme" is really part of the path)
rest = url[i + 1 :]
if not rest or any(c not in s("0123456789") for c in rest):
# not a port number
scheme, url = url[:i].lower(), rest
if url[:2] == s("//"):
delim = len(url)
for c in s("/?#"):
wdelim = url.find(c, 2)
if wdelim >= 0:
delim = min(delim, wdelim)
netloc, url = url[2:delim], url[delim:]
if (s("[") in netloc and s("]") not in netloc) or (
s("]") in netloc and s("[") not in netloc
):
raise ValueError("Invalid IPv6 URL")
if allow_fragments and s("#") in url:
url, fragment = url.split(s("#"), 1)
if s("?") in url:
url, query = url.split(s("?"), 1)
result_type = URL if is_text_based else BytesURL
return result_type(scheme, netloc, url, query, fragment)
def _make_fast_url_quote(charset="utf-8", errors="strict", safe="/:", unsafe=""):
"""Precompile the translation table for a URL encoding function.
Unlike :func:`url_quote`, the generated function only takes the
string to quote.
:param charset: The charset to encode the result with.
:param errors: How to handle encoding errors.
:param safe: An optional sequence of safe characters to never encode.
:param unsafe: An optional sequence of unsafe characters to always encode.
"""
if isinstance(safe, text_type):
safe = safe.encode(charset, errors)
if isinstance(unsafe, text_type):
unsafe = unsafe.encode(charset, errors)
safe = (frozenset(bytearray(safe)) | _always_safe) - frozenset(bytearray(unsafe))
table = [chr(c) if c in safe else "%%%02X" % c for c in range(256)]
if not PY2:
def quote(string):
return "".join([table[c] for c in string])
else:
def quote(string):
return "".join([table[c] for c in bytearray(string)])
return quote
_fast_url_quote = _make_fast_url_quote()
_fast_quote_plus = _make_fast_url_quote(safe=" ", unsafe="+")
def _fast_url_quote_plus(string):
return _fast_quote_plus(string).replace(" ", "+")
def url_quote(string, charset="utf-8", errors="strict", safe="/:", unsafe=""):
"""URL encode a single string with a given encoding.
:param s: the string to quote.
:param charset: the charset to be used.
:param safe: an optional sequence of safe characters.
:param unsafe: an optional sequence of unsafe characters.
.. versionadded:: 0.9.2
The `unsafe` parameter was added.
"""
if not isinstance(string, (text_type, bytes, bytearray)):
string = text_type(string)
if isinstance(string, text_type):
string = string.encode(charset, errors)
if isinstance(safe, text_type):
safe = safe.encode(charset, errors)
if isinstance(unsafe, text_type):
unsafe = unsafe.encode(charset, errors)
safe = (frozenset(bytearray(safe)) | _always_safe) - frozenset(bytearray(unsafe))
rv = bytearray()
for char in bytearray(string):
if char in safe:
rv.append(char)
else:
rv.extend(_bytetohex[char])
return to_native(bytes(rv))
def url_quote_plus(string, charset="utf-8", errors="strict", safe=""):
"""URL encode a single string with the given encoding and convert
whitespace to "+".
:param s: The string to quote.
:param charset: The charset to be used.
:param safe: An optional sequence of safe characters.
"""
return url_quote(string, charset, errors, safe + " ", "+").replace(" ", "+")
def url_unparse(components):
"""The reverse operation to :meth:`url_parse`. This accepts arbitrary
as well as :class:`URL` tuples and returns a URL as a string.
:param components: the parsed URL as tuple which should be converted
into a URL string.
"""
scheme, netloc, path, query, fragment = normalize_string_tuple(components)
s = make_literal_wrapper(scheme)
url = s("")
# We generally treat file:///x and file:/x the same which is also
# what browsers seem to do. This also allows us to ignore a schema
# register for netloc utilization or having to differentiate between
# empty and missing netloc.
if netloc or (scheme and path.startswith(s("/"))):
if path and path[:1] != s("/"):
path = s("/") + path
url = s("//") + (netloc or s("")) + path
elif path:
url += path
if scheme:
url = scheme + s(":") + url
if query:
url = url + s("?") + query
if fragment:
url = url + s("#") + fragment
return url
def url_unquote(string, charset="utf-8", errors="replace", unsafe=""):
"""URL decode a single string with a given encoding. If the charset
is set to `None` no unicode decoding is performed and raw bytes
are returned.
:param s: the string to unquote.
:param charset: the charset of the query string. If set to `None`
no unicode decoding will take place.
:param errors: the error handling for the charset decoding.
"""
rv = _unquote_to_bytes(string, unsafe)
if charset is not None:
rv = rv.decode(charset, errors)
return rv
def url_unquote_plus(s, charset="utf-8", errors="replace"):
"""URL decode a single string with the given `charset` and decode "+" to
whitespace.
Per default encoding errors are ignored. If you want a different behavior
you can set `errors` to ``'replace'`` or ``'strict'``. In strict mode a
:exc:`HTTPUnicodeError` is raised.
:param s: The string to unquote.
:param charset: the charset of the query string. If set to `None`
no unicode decoding will take place.
:param errors: The error handling for the `charset` decoding.
"""
if isinstance(s, text_type):
s = s.replace(u"+", u" ")
else:
s = s.replace(b"+", b" ")
return url_unquote(s, charset, errors)
def url_fix(s, charset="utf-8"):
r"""Sometimes you get an URL by a user that just isn't a real URL because
it contains unsafe characters like ' ' and so on. This function can fix
some of the problems in a similar way browsers handle data entered by the
user:
>>> url_fix(u'http://de.wikipedia.org/wiki/Elf (Begriffskl\xe4rung)')
'http://de.wikipedia.org/wiki/Elf%20(Begriffskl%C3%A4rung)'
:param s: the string with the URL to fix.
:param charset: The target charset for the URL if the url was given as
unicode string.
"""
# First step is to switch to unicode processing and to convert
# backslashes (which are invalid in URLs anyways) to slashes. This is
# consistent with what Chrome does.
s = to_unicode(s, charset, "replace").replace("\\", "/")
# For the specific case that we look like a malformed windows URL
# we want to fix this up manually:
if s.startswith("file://") and s[7:8].isalpha() and s[8:10] in (":/", "|/"):
s = "file:///" + s[7:]
url = url_parse(s)
path = url_quote(url.path, charset, safe="/%+$!*'(),")
qs = url_quote_plus(url.query, charset, safe=":&%=+$!*'(),")
anchor = url_quote_plus(url.fragment, charset, safe=":&%=+$!*'(),")
return to_native(url_unparse((url.scheme, url.encode_netloc(), path, qs, anchor)))
# not-unreserved characters remain quoted when unquoting to IRI
_to_iri_unsafe = "".join([chr(c) for c in range(128) if c not in _always_safe])
def _codec_error_url_quote(e):
"""Used in :func:`uri_to_iri` after unquoting to re-quote any
invalid bytes.
"""
out = _fast_url_quote(e.object[e.start : e.end])
if PY2:
out = out.decode("utf-8")
return out, e.end
codecs.register_error("werkzeug.url_quote", _codec_error_url_quote)
def uri_to_iri(uri, charset="utf-8", errors="werkzeug.url_quote"):
"""Convert a URI to an IRI. All valid UTF-8 characters are unquoted,
leaving all reserved and invalid characters quoted. If the URL has
a domain, it is decoded from Punycode.
>>> uri_to_iri("http://xn--n3h.net/p%C3%A5th?q=%C3%A8ry%DF")
'http://\\u2603.net/p\\xe5th?q=\\xe8ry%DF'
:param uri: The URI to convert.
:param charset: The encoding to encode unquoted bytes with.
:param errors: Error handler to use during ``bytes.encode``. By
default, invalid bytes are left quoted.
.. versionchanged:: 0.15
All reserved and invalid characters remain quoted. Previously,
only some reserved characters were preserved, and invalid bytes
were replaced instead of left quoted.
.. versionadded:: 0.6
"""
if isinstance(uri, tuple):
uri = url_unparse(uri)
uri = url_parse(to_unicode(uri, charset))
path = url_unquote(uri.path, charset, errors, _to_iri_unsafe)
query = url_unquote(uri.query, charset, errors, _to_iri_unsafe)
fragment = url_unquote(uri.fragment, charset, errors, _to_iri_unsafe)
return url_unparse((uri.scheme, uri.decode_netloc(), path, query, fragment))
# reserved characters remain unquoted when quoting to URI
_to_uri_safe = ":/?#[]@!$&'()*+,;=%"
def iri_to_uri(iri, charset="utf-8", errors="strict", safe_conversion=False):
"""Convert an IRI to a URI. All non-ASCII and unsafe characters are
quoted. If the URL has a domain, it is encoded to Punycode.
>>> iri_to_uri('http://\\u2603.net/p\\xe5th?q=\\xe8ry%DF')
'http://xn--n3h.net/p%C3%A5th?q=%C3%A8ry%DF'
:param iri: The IRI to convert.
:param charset: The encoding of the IRI.
:param errors: Error handler to use during ``bytes.encode``.
:param safe_conversion: Return the URL unchanged if it only contains
ASCII characters and no whitespace. See the explanation below.
There is a general problem with IRI conversion with some protocols
that are in violation of the URI specification. Consider the
following two IRIs::
magnet:?xt=uri:whatever
itms-services://?action=download-manifest
After parsing, we don't know if the scheme requires the ``//``,
which is dropped if empty, but conveys different meanings in the
final URL if it's present or not. In this case, you can use
``safe_conversion``, which will return the URL unchanged if it only
contains ASCII characters and no whitespace. This can result in a
URI with unquoted characters if it was not already quoted correctly,
but preserves the URL's semantics. Werkzeug uses this for the
``Location`` header for redirects.
.. versionchanged:: 0.15
All reserved characters remain unquoted. Previously, only some
reserved characters were left unquoted.
.. versionchanged:: 0.9.6
The ``safe_conversion`` parameter was added.
.. versionadded:: 0.6
"""
if isinstance(iri, tuple):
iri = url_unparse(iri)
if safe_conversion:
# If we're not sure if it's safe to convert the URL, and it only
# contains ASCII characters, return it unconverted.
try:
native_iri = to_native(iri)
ascii_iri = native_iri.encode("ascii")
# Only return if it doesn't have whitespace. (Why?)
if len(ascii_iri.split()) == 1:
return native_iri
except UnicodeError:
pass
iri = url_parse(to_unicode(iri, charset, errors))
path = url_quote(iri.path, charset, errors, _to_uri_safe)
query = url_quote(iri.query, charset, errors, _to_uri_safe)
fragment = url_quote(iri.fragment, charset, errors, _to_uri_safe)
return to_native(
url_unparse((iri.scheme, iri.encode_netloc(), path, query, fragment))
)
def url_decode(
s,
charset="utf-8",
decode_keys=False,
include_empty=True,
errors="replace",
separator="&",
cls=None,
):
"""
Parse a querystring and return it as :class:`MultiDict`. There is a
difference in key decoding on different Python versions. On Python 3
keys will always be fully decoded whereas on Python 2, keys will
remain bytestrings if they fit into ASCII. On 2.x keys can be forced
to be unicode by setting `decode_keys` to `True`.
If the charset is set to `None` no unicode decoding will happen and
raw bytes will be returned.
Per default a missing value for a key will default to an empty key. If
you don't want that behavior you can set `include_empty` to `False`.
Per default encoding errors are ignored. If you want a different behavior
you can set `errors` to ``'replace'`` or ``'strict'``. In strict mode a
`HTTPUnicodeError` is raised.
.. versionchanged:: 0.5
In previous versions ";" and "&" could be used for url decoding.
This changed in 0.5 where only "&" is supported. If you want to
use ";" instead a different `separator` can be provided.
The `cls` parameter was added.
:param s: a string with the query string to decode.
:param charset: the charset of the query string. If set to `None`
no unicode decoding will take place.
:param decode_keys: Used on Python 2.x to control whether keys should
be forced to be unicode objects. If set to `True`
then keys will be unicode in all cases. Otherwise,
they remain `str` if they fit into ASCII.
:param include_empty: Set to `False` if you don't want empty values to
appear in the dict.
:param errors: the decoding error behavior.
:param separator: the pair separator to be used, defaults to ``&``
:param cls: an optional dict class to use. If this is not specified
or `None` the default :class:`MultiDict` is used.
"""
if cls is None:
from .datastructures import MultiDict
cls = MultiDict
if isinstance(s, text_type) and not isinstance(separator, text_type):
separator = separator.decode(charset or "ascii")
elif isinstance(s, bytes) and not isinstance(separator, bytes):
separator = separator.encode(charset or "ascii")
return cls(
_url_decode_impl(
s.split(separator), charset, decode_keys, include_empty, errors
)
)
def url_decode_stream(
stream,
charset="utf-8",
decode_keys=False,
include_empty=True,
errors="replace",
separator="&",
cls=None,
limit=None,
return_iterator=False,
):
"""Works like :func:`url_decode` but decodes a stream. The behavior
of stream and limit follows functions like
:func:`~werkzeug.wsgi.make_line_iter`. The generator of pairs is
directly fed to the `cls` so you can consume the data while it's
parsed.
.. versionadded:: 0.8
:param stream: a stream with the encoded querystring
:param charset: the charset of the query string. If set to `None`
no unicode decoding will take place.
:param decode_keys: Used on Python 2.x to control whether keys should
be forced to be unicode objects. If set to `True`,
keys will be unicode in all cases. Otherwise, they
remain `str` if they fit into ASCII.
:param include_empty: Set to `False` if you don't want empty values to
appear in the dict.
:param errors: the decoding error behavior.
:param separator: the pair separator to be used, defaults to ``&``
:param cls: an optional dict class to use. If this is not specified
or `None` the default :class:`MultiDict` is used.
:param limit: the content length of the URL data. Not necessary if
a limited stream is provided.
:param return_iterator: if set to `True` the `cls` argument is ignored
and an iterator over all decoded pairs is
returned
"""
from .wsgi import make_chunk_iter
pair_iter = make_chunk_iter(stream, separator, limit)
decoder = _url_decode_impl(pair_iter, charset, decode_keys, include_empty, errors)
if return_iterator:
return decoder
if cls is None:
from .datastructures import MultiDict
cls = MultiDict
return cls(decoder)
def _url_decode_impl(pair_iter, charset, decode_keys, include_empty, errors):
for pair in pair_iter:
if not pair:
continue
s = make_literal_wrapper(pair)
equal = s("=")
if equal in pair:
key, value = pair.split(equal, 1)
else:
if not include_empty:
continue
key = pair
value = s("")
key = url_unquote_plus(key, charset, errors)
if charset is not None and PY2 and not decode_keys:
key = try_coerce_native(key)
yield key, url_unquote_plus(value, charset, errors)
def url_encode(
obj, charset="utf-8", encode_keys=False, sort=False, key=None, separator=b"&"
):
"""URL encode a dict/`MultiDict`. If a value is `None` it will not appear
in the result string. Per default only values are encoded into the target
charset strings. If `encode_keys` is set to ``True`` unicode keys are
supported too.
If `sort` is set to `True` the items are sorted by `key` or the default
sorting algorithm.
.. versionadded:: 0.5
`sort`, `key`, and `separator` were added.
:param obj: the object to encode into a query string.
:param charset: the charset of the query string.
:param encode_keys: set to `True` if you have unicode keys. (Ignored on
Python 3.x)
:param sort: set to `True` if you want parameters to be sorted by `key`.
:param separator: the separator to be used for the pairs.
:param key: an optional function to be used for sorting. For more details
check out the :func:`sorted` documentation.
"""
separator = to_native(separator, "ascii")
return separator.join(_url_encode_impl(obj, charset, encode_keys, sort, key))
def url_encode_stream(
obj,
stream=None,
charset="utf-8",
encode_keys=False,
sort=False,
key=None,
separator=b"&",
):
"""Like :meth:`url_encode` but writes the results to a stream
object. If the stream is `None` a generator over all encoded
pairs is returned.
.. versionadded:: 0.8
:param obj: the object to encode into a query string.
:param stream: a stream to write the encoded object into or `None` if
an iterator over the encoded pairs should be returned. In
that case the separator argument is ignored.
:param charset: the charset of the query string.
:param encode_keys: set to `True` if you have unicode keys. (Ignored on
Python 3.x)
:param sort: set to `True` if you want parameters to be sorted by `key`.
:param separator: the separator to be used for the pairs.
:param key: an optional function to be used for sorting. For more details
check out the :func:`sorted` documentation.
"""
separator = to_native(separator, "ascii")
gen = _url_encode_impl(obj, charset, encode_keys, sort, key)
if stream is None:
return gen
for idx, chunk in enumerate(gen):
if idx:
stream.write(separator)
stream.write(chunk)
def url_join(base, url, allow_fragments=True):
"""Join a base URL and a possibly relative URL to form an absolute
interpretation of the latter.
:param base: the base URL for the join operation.
:param url: the URL to join.
:param allow_fragments: indicates whether fragments should be allowed.
"""
if isinstance(base, tuple):
base = url_unparse(base)
if isinstance(url, tuple):
url = url_unparse(url)
base, url = normalize_string_tuple((base, url))
s = make_literal_wrapper(base)
if not base:
return url
if not url:
return base
bscheme, bnetloc, bpath, bquery, bfragment = url_parse(
base, allow_fragments=allow_fragments
)
scheme, netloc, path, query, fragment = url_parse(url, bscheme, allow_fragments)
if scheme != bscheme:
return url
if netloc:
return url_unparse((scheme, netloc, path, query, fragment))
netloc = bnetloc
if path[:1] == s("/"):
segments = path.split(s("/"))
elif not path:
segments = bpath.split(s("/"))
if not query:
query = bquery
else:
segments = bpath.split(s("/"))[:-1] + path.split(s("/"))
# If the rightmost part is "./" we want to keep the slash but
# remove the dot.
if segments[-1] == s("."):
segments[-1] = s("")
# Resolve ".." and "."
segments = [segment for segment in segments if segment != s(".")]
while 1:
i = 1
n = len(segments) - 1
while i < n:
if segments[i] == s("..") and segments[i - 1] not in (s(""), s("..")):
del segments[i - 1 : i + 1]
break
i += 1
else:
break
# Remove trailing ".." if the URL is absolute
unwanted_marker = [s(""), s("..")]
while segments[:2] == unwanted_marker:
del segments[1]
path = s("/").join(segments)
return url_unparse((scheme, netloc, path, query, fragment))
class Href(object):
"""Implements a callable that constructs URLs with the given base. The
function can be called with any number of positional and keyword
arguments which than are used to assemble the URL. Works with URLs
and posix paths.
Positional arguments are appended as individual segments to
the path of the URL:
>>> href = Href('/foo')
>>> href('bar', 23)
'/foo/bar/23'
>>> href('foo', bar=23)
'/foo/foo?bar=23'
If any of the arguments (positional or keyword) evaluates to `None` it
will be skipped. If no keyword arguments are given the last argument
can be a :class:`dict` or :class:`MultiDict` (or any other dict subclass),
otherwise the keyword arguments are used for the query parameters, cutting
off the first trailing underscore of the parameter name:
>>> href(is_=42)
'/foo?is=42'
>>> href({'foo': 'bar'})
'/foo?foo=bar'
Combining of both methods is not allowed:
>>> href({'foo': 'bar'}, bar=42)
Traceback (most recent call last):
...
TypeError: keyword arguments and query-dicts can't be combined
Accessing attributes on the href object creates a new href object with
the attribute name as prefix:
>>> bar_href = href.bar
>>> bar_href("blub")
'/foo/bar/blub'
If `sort` is set to `True` the items are sorted by `key` or the default
sorting algorithm:
>>> href = Href("/", sort=True)
>>> href(a=1, b=2, c=3)
'/?a=1&b=2&c=3'
.. versionadded:: 0.5
`sort` and `key` were added.
"""
def __init__(self, base="./", charset="utf-8", sort=False, key=None):
if not base:
base = "./"
self.base = base
self.charset = charset
self.sort = sort
self.key = key
def __getattr__(self, name):
if name[:2] == "__":
raise AttributeError(name)
base = self.base
if base[-1:] != "/":
base += "/"
return Href(url_join(base, name), self.charset, self.sort, self.key)
def __call__(self, *path, **query):
if path and isinstance(path[-1], dict):
if query:
raise TypeError("keyword arguments and query-dicts can't be combined")
query, path = path[-1], path[:-1]
elif query:
query = dict(
[(k.endswith("_") and k[:-1] or k, v) for k, v in query.items()]
)
path = "/".join(
[
to_unicode(url_quote(x, self.charset), "ascii")
for x in path
if x is not None
]
).lstrip("/")
rv = self.base
if path:
if not rv.endswith("/"):
rv += "/"
rv = url_join(rv, "./" + path)
if query:
rv += "?" + to_unicode(
url_encode(query, self.charset, sort=self.sort, key=self.key), "ascii"
)
return to_native(rv)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/wsgi.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.wsgi
~~~~~~~~~~~~~
This module implements WSGI related helpers.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import io
import re
from functools import partial
from functools import update_wrapper
from itertools import chain
from ._compat import BytesIO
from ._compat import implements_iterator
from ._compat import make_literal_wrapper
from ._compat import string_types
from ._compat import text_type
from ._compat import to_bytes
from ._compat import to_unicode
from ._compat import try_coerce_native
from ._compat import wsgi_get_bytes
from ._internal import _encode_idna
from .urls import uri_to_iri
from .urls import url_join
from .urls import url_parse
from .urls import url_quote
def responder(f):
"""Marks a function as responder. Decorate a function with it and it
will automatically call the return value as WSGI application.
Example::
@responder
def application(environ, start_response):
return Response('Hello World!')
"""
return update_wrapper(lambda *a: f(*a)(*a[-2:]), f)
def get_current_url(
environ,
root_only=False,
strip_querystring=False,
host_only=False,
trusted_hosts=None,
):
"""A handy helper function that recreates the full URL as IRI for the
current request or parts of it. Here's an example:
>>> from werkzeug.test import create_environ
>>> env = create_environ("/?param=foo", "http://localhost/script")
>>> get_current_url(env)
'http://localhost/script/?param=foo'
>>> get_current_url(env, root_only=True)
'http://localhost/script/'
>>> get_current_url(env, host_only=True)
'http://localhost/'
>>> get_current_url(env, strip_querystring=True)
'http://localhost/script/'
This optionally it verifies that the host is in a list of trusted hosts.
If the host is not in there it will raise a
:exc:`~werkzeug.exceptions.SecurityError`.
Note that the string returned might contain unicode characters as the
representation is an IRI not an URI. If you need an ASCII only
representation you can use the :func:`~werkzeug.urls.iri_to_uri`
function:
>>> from werkzeug.urls import iri_to_uri
>>> iri_to_uri(get_current_url(env))
'http://localhost/script/?param=foo'
:param environ: the WSGI environment to get the current URL from.
:param root_only: set `True` if you only want the root URL.
:param strip_querystring: set to `True` if you don't want the querystring.
:param host_only: set to `True` if the host URL should be returned.
:param trusted_hosts: a list of trusted hosts, see :func:`host_is_trusted`
for more information.
"""
tmp = [environ["wsgi.url_scheme"], "://", get_host(environ, trusted_hosts)]
cat = tmp.append
if host_only:
return uri_to_iri("".join(tmp) + "/")
cat(url_quote(wsgi_get_bytes(environ.get("SCRIPT_NAME", ""))).rstrip("/"))
cat("/")
if not root_only:
cat(url_quote(wsgi_get_bytes(environ.get("PATH_INFO", "")).lstrip(b"/")))
if not strip_querystring:
qs = get_query_string(environ)
if qs:
cat("?" + qs)
return uri_to_iri("".join(tmp))
def host_is_trusted(hostname, trusted_list):
"""Checks if a host is trusted against a list. This also takes care
of port normalization.
.. versionadded:: 0.9
:param hostname: the hostname to check
:param trusted_list: a list of hostnames to check against. If a
hostname starts with a dot it will match against
all subdomains as well.
"""
if not hostname:
return False
if isinstance(trusted_list, string_types):
trusted_list = [trusted_list]
def _normalize(hostname):
if ":" in hostname:
hostname = hostname.rsplit(":", 1)[0]
return _encode_idna(hostname)
try:
hostname = _normalize(hostname)
except UnicodeError:
return False
for ref in trusted_list:
if ref.startswith("."):
ref = ref[1:]
suffix_match = True
else:
suffix_match = False
try:
ref = _normalize(ref)
except UnicodeError:
return False
if ref == hostname:
return True
if suffix_match and hostname.endswith(b"." + ref):
return True
return False
def get_host(environ, trusted_hosts=None):
"""Return the host for the given WSGI environment. This first checks
the ``Host`` header. If it's not present, then ``SERVER_NAME`` and
``SERVER_PORT`` are used. The host will only contain the port if it
is different than the standard port for the protocol.
Optionally, verify that the host is trusted using
:func:`host_is_trusted` and raise a
:exc:`~werkzeug.exceptions.SecurityError` if it is not.
:param environ: The WSGI environment to get the host from.
:param trusted_hosts: A list of trusted hosts.
:return: Host, with port if necessary.
:raise ~werkzeug.exceptions.SecurityError: If the host is not
trusted.
"""
if "HTTP_HOST" in environ:
rv = environ["HTTP_HOST"]
if environ["wsgi.url_scheme"] == "http" and rv.endswith(":80"):
rv = rv[:-3]
elif environ["wsgi.url_scheme"] == "https" and rv.endswith(":443"):
rv = rv[:-4]
else:
rv = environ["SERVER_NAME"]
if (environ["wsgi.url_scheme"], environ["SERVER_PORT"]) not in (
("https", "443"),
("http", "80"),
):
rv += ":" + environ["SERVER_PORT"]
if trusted_hosts is not None:
if not host_is_trusted(rv, trusted_hosts):
from .exceptions import SecurityError
raise SecurityError('Host "%s" is not trusted' % rv)
return rv
def get_content_length(environ):
"""Returns the content length from the WSGI environment as
integer. If it's not available or chunked transfer encoding is used,
``None`` is returned.
.. versionadded:: 0.9
:param environ: the WSGI environ to fetch the content length from.
"""
if environ.get("HTTP_TRANSFER_ENCODING", "") == "chunked":
return None
content_length = environ.get("CONTENT_LENGTH")
if content_length is not None:
try:
return max(0, int(content_length))
except (ValueError, TypeError):
pass
def get_input_stream(environ, safe_fallback=True):
"""Returns the input stream from the WSGI environment and wraps it
in the most sensible way possible. The stream returned is not the
raw WSGI stream in most cases but one that is safe to read from
without taking into account the content length.
If content length is not set, the stream will be empty for safety reasons.
If the WSGI server supports chunked or infinite streams, it should set
the ``wsgi.input_terminated`` value in the WSGI environ to indicate that.
.. versionadded:: 0.9
:param environ: the WSGI environ to fetch the stream from.
:param safe_fallback: use an empty stream as a safe fallback when the
content length is not set. Disabling this allows infinite streams,
which can be a denial-of-service risk.
"""
stream = environ["wsgi.input"]
content_length = get_content_length(environ)
# A wsgi extension that tells us if the input is terminated. In
# that case we return the stream unchanged as we know we can safely
# read it until the end.
if environ.get("wsgi.input_terminated"):
return stream
# If the request doesn't specify a content length, returning the stream is
# potentially dangerous because it could be infinite, malicious or not. If
# safe_fallback is true, return an empty stream instead for safety.
if content_length is None:
return BytesIO() if safe_fallback else stream
# Otherwise limit the stream to the content length
return LimitedStream(stream, content_length)
def get_query_string(environ):
"""Returns the `QUERY_STRING` from the WSGI environment. This also takes
care about the WSGI decoding dance on Python 3 environments as a
native string. The string returned will be restricted to ASCII
characters.
.. versionadded:: 0.9
:param environ: the WSGI environment object to get the query string from.
"""
qs = wsgi_get_bytes(environ.get("QUERY_STRING", ""))
# QUERY_STRING really should be ascii safe but some browsers
# will send us some unicode stuff (I am looking at you IE).
# In that case we want to urllib quote it badly.
return try_coerce_native(url_quote(qs, safe=":&%=+$!*'(),"))
def get_path_info(environ, charset="utf-8", errors="replace"):
"""Returns the `PATH_INFO` from the WSGI environment and properly
decodes it. This also takes care about the WSGI decoding dance
on Python 3 environments. if the `charset` is set to `None` a
bytestring is returned.
.. versionadded:: 0.9
:param environ: the WSGI environment object to get the path from.
:param charset: the charset for the path info, or `None` if no
decoding should be performed.
:param errors: the decoding error handling.
"""
path = wsgi_get_bytes(environ.get("PATH_INFO", ""))
return to_unicode(path, charset, errors, allow_none_charset=True)
def get_script_name(environ, charset="utf-8", errors="replace"):
"""Returns the `SCRIPT_NAME` from the WSGI environment and properly
decodes it. This also takes care about the WSGI decoding dance
on Python 3 environments. if the `charset` is set to `None` a
bytestring is returned.
.. versionadded:: 0.9
:param environ: the WSGI environment object to get the path from.
:param charset: the charset for the path, or `None` if no
decoding should be performed.
:param errors: the decoding error handling.
"""
path = wsgi_get_bytes(environ.get("SCRIPT_NAME", ""))
return to_unicode(path, charset, errors, allow_none_charset=True)
def pop_path_info(environ, charset="utf-8", errors="replace"):
"""Removes and returns the next segment of `PATH_INFO`, pushing it onto
`SCRIPT_NAME`. Returns `None` if there is nothing left on `PATH_INFO`.
If the `charset` is set to `None` a bytestring is returned.
If there are empty segments (``'/foo//bar``) these are ignored but
properly pushed to the `SCRIPT_NAME`:
>>> env = {'SCRIPT_NAME': '/foo', 'PATH_INFO': '/a/b'}
>>> pop_path_info(env)
'a'
>>> env['SCRIPT_NAME']
'/foo/a'
>>> pop_path_info(env)
'b'
>>> env['SCRIPT_NAME']
'/foo/a/b'
.. versionadded:: 0.5
.. versionchanged:: 0.9
The path is now decoded and a charset and encoding
parameter can be provided.
:param environ: the WSGI environment that is modified.
"""
path = environ.get("PATH_INFO")
if not path:
return None
script_name = environ.get("SCRIPT_NAME", "")
# shift multiple leading slashes over
old_path = path
path = path.lstrip("/")
if path != old_path:
script_name += "/" * (len(old_path) - len(path))
if "/" not in path:
environ["PATH_INFO"] = ""
environ["SCRIPT_NAME"] = script_name + path
rv = wsgi_get_bytes(path)
else:
segment, path = path.split("/", 1)
environ["PATH_INFO"] = "/" + path
environ["SCRIPT_NAME"] = script_name + segment
rv = wsgi_get_bytes(segment)
return to_unicode(rv, charset, errors, allow_none_charset=True)
def peek_path_info(environ, charset="utf-8", errors="replace"):
"""Returns the next segment on the `PATH_INFO` or `None` if there
is none. Works like :func:`pop_path_info` without modifying the
environment:
>>> env = {'SCRIPT_NAME': '/foo', 'PATH_INFO': '/a/b'}
>>> peek_path_info(env)
'a'
>>> peek_path_info(env)
'a'
If the `charset` is set to `None` a bytestring is returned.
.. versionadded:: 0.5
.. versionchanged:: 0.9
The path is now decoded and a charset and encoding
parameter can be provided.
:param environ: the WSGI environment that is checked.
"""
segments = environ.get("PATH_INFO", "").lstrip("/").split("/", 1)
if segments:
return to_unicode(
wsgi_get_bytes(segments[0]), charset, errors, allow_none_charset=True
)
def extract_path_info(
environ_or_baseurl,
path_or_url,
charset="utf-8",
errors="werkzeug.url_quote",
collapse_http_schemes=True,
):
"""Extracts the path info from the given URL (or WSGI environment) and
path. The path info returned is a unicode string, not a bytestring
suitable for a WSGI environment. The URLs might also be IRIs.
If the path info could not be determined, `None` is returned.
Some examples:
>>> extract_path_info('http://example.com/app', '/app/hello')
u'/hello'
>>> extract_path_info('http://example.com/app',
... 'https://example.com/app/hello')
u'/hello'
>>> extract_path_info('http://example.com/app',
... 'https://example.com/app/hello',
... collapse_http_schemes=False) is None
True
Instead of providing a base URL you can also pass a WSGI environment.
:param environ_or_baseurl: a WSGI environment dict, a base URL or
base IRI. This is the root of the
application.
:param path_or_url: an absolute path from the server root, a
relative path (in which case it's the path info)
or a full URL. Also accepts IRIs and unicode
parameters.
:param charset: the charset for byte data in URLs
:param errors: the error handling on decode
:param collapse_http_schemes: if set to `False` the algorithm does
not assume that http and https on the
same server point to the same
resource.
.. versionchanged:: 0.15
The ``errors`` parameter defaults to leaving invalid bytes
quoted instead of replacing them.
.. versionadded:: 0.6
"""
def _normalize_netloc(scheme, netloc):
parts = netloc.split(u"@", 1)[-1].split(u":", 1)
if len(parts) == 2:
netloc, port = parts
if (scheme == u"http" and port == u"80") or (
scheme == u"https" and port == u"443"
):
port = None
else:
netloc = parts[0]
port = None
if port is not None:
netloc += u":" + port
return netloc
# make sure whatever we are working on is a IRI and parse it
path = uri_to_iri(path_or_url, charset, errors)
if isinstance(environ_or_baseurl, dict):
environ_or_baseurl = get_current_url(environ_or_baseurl, root_only=True)
base_iri = uri_to_iri(environ_or_baseurl, charset, errors)
base_scheme, base_netloc, base_path = url_parse(base_iri)[:3]
cur_scheme, cur_netloc, cur_path, = url_parse(url_join(base_iri, path))[:3]
# normalize the network location
base_netloc = _normalize_netloc(base_scheme, base_netloc)
cur_netloc = _normalize_netloc(cur_scheme, cur_netloc)
# is that IRI even on a known HTTP scheme?
if collapse_http_schemes:
for scheme in base_scheme, cur_scheme:
if scheme not in (u"http", u"https"):
return None
else:
if not (base_scheme in (u"http", u"https") and base_scheme == cur_scheme):
return None
# are the netlocs compatible?
if base_netloc != cur_netloc:
return None
# are we below the application path?
base_path = base_path.rstrip(u"/")
if not cur_path.startswith(base_path):
return None
return u"/" + cur_path[len(base_path) :].lstrip(u"/")
@implements_iterator
class ClosingIterator(object):
"""The WSGI specification requires that all middlewares and gateways
respect the `close` callback of the iterable returned by the application.
Because it is useful to add another close action to a returned iterable
and adding a custom iterable is a boring task this class can be used for
that::
return ClosingIterator(app(environ, start_response), [cleanup_session,
cleanup_locals])
If there is just one close function it can be passed instead of the list.
A closing iterator is not needed if the application uses response objects
and finishes the processing if the response is started::
try:
return response(environ, start_response)
finally:
cleanup_session()
cleanup_locals()
"""
def __init__(self, iterable, callbacks=None):
iterator = iter(iterable)
self._next = partial(next, iterator)
if callbacks is None:
callbacks = []
elif callable(callbacks):
callbacks = [callbacks]
else:
callbacks = list(callbacks)
iterable_close = getattr(iterable, "close", None)
if iterable_close:
callbacks.insert(0, iterable_close)
self._callbacks = callbacks
def __iter__(self):
return self
def __next__(self):
return self._next()
def close(self):
for callback in self._callbacks:
callback()
def wrap_file(environ, file, buffer_size=8192):
"""Wraps a file. This uses the WSGI server's file wrapper if available
or otherwise the generic :class:`FileWrapper`.
.. versionadded:: 0.5
If the file wrapper from the WSGI server is used it's important to not
iterate over it from inside the application but to pass it through
unchanged. If you want to pass out a file wrapper inside a response
object you have to set :attr:`~BaseResponse.direct_passthrough` to `True`.
More information about file wrappers are available in :pep:`333`.
:param file: a :class:`file`-like object with a :meth:`~file.read` method.
:param buffer_size: number of bytes for one iteration.
"""
return environ.get("wsgi.file_wrapper", FileWrapper)(file, buffer_size)
@implements_iterator
class FileWrapper(object):
"""This class can be used to convert a :class:`file`-like object into
an iterable. It yields `buffer_size` blocks until the file is fully
read.
You should not use this class directly but rather use the
:func:`wrap_file` function that uses the WSGI server's file wrapper
support if it's available.
.. versionadded:: 0.5
If you're using this object together with a :class:`BaseResponse` you have
to use the `direct_passthrough` mode.
:param file: a :class:`file`-like object with a :meth:`~file.read` method.
:param buffer_size: number of bytes for one iteration.
"""
def __init__(self, file, buffer_size=8192):
self.file = file
self.buffer_size = buffer_size
def close(self):
if hasattr(self.file, "close"):
self.file.close()
def seekable(self):
if hasattr(self.file, "seekable"):
return self.file.seekable()
if hasattr(self.file, "seek"):
return True
return False
def seek(self, *args):
if hasattr(self.file, "seek"):
self.file.seek(*args)
def tell(self):
if hasattr(self.file, "tell"):
return self.file.tell()
return None
def __iter__(self):
return self
def __next__(self):
data = self.file.read(self.buffer_size)
if data:
return data
raise StopIteration()
@implements_iterator
class _RangeWrapper(object):
# private for now, but should we make it public in the future ?
"""This class can be used to convert an iterable object into
an iterable that will only yield a piece of the underlying content.
It yields blocks until the underlying stream range is fully read.
The yielded blocks will have a size that can't exceed the original
iterator defined block size, but that can be smaller.
If you're using this object together with a :class:`BaseResponse` you have
to use the `direct_passthrough` mode.
:param iterable: an iterable object with a :meth:`__next__` method.
:param start_byte: byte from which read will start.
:param byte_range: how many bytes to read.
"""
def __init__(self, iterable, start_byte=0, byte_range=None):
self.iterable = iter(iterable)
self.byte_range = byte_range
self.start_byte = start_byte
self.end_byte = None
if byte_range is not None:
self.end_byte = self.start_byte + self.byte_range
self.read_length = 0
self.seekable = hasattr(iterable, "seekable") and iterable.seekable()
self.end_reached = False
def __iter__(self):
return self
def _next_chunk(self):
try:
chunk = next(self.iterable)
self.read_length += len(chunk)
return chunk
except StopIteration:
self.end_reached = True
raise
def _first_iteration(self):
chunk = None
if self.seekable:
self.iterable.seek(self.start_byte)
self.read_length = self.iterable.tell()
contextual_read_length = self.read_length
else:
while self.read_length <= self.start_byte:
chunk = self._next_chunk()
if chunk is not None:
chunk = chunk[self.start_byte - self.read_length :]
contextual_read_length = self.start_byte
return chunk, contextual_read_length
def _next(self):
if self.end_reached:
raise StopIteration()
chunk = None
contextual_read_length = self.read_length
if self.read_length == 0:
chunk, contextual_read_length = self._first_iteration()
if chunk is None:
chunk = self._next_chunk()
if self.end_byte is not None and self.read_length >= self.end_byte:
self.end_reached = True
return chunk[: self.end_byte - contextual_read_length]
return chunk
def __next__(self):
chunk = self._next()
if chunk:
return chunk
self.end_reached = True
raise StopIteration()
def close(self):
if hasattr(self.iterable, "close"):
self.iterable.close()
def _make_chunk_iter(stream, limit, buffer_size):
"""Helper for the line and chunk iter functions."""
if isinstance(stream, (bytes, bytearray, text_type)):
raise TypeError(
"Passed a string or byte object instead of true iterator or stream."
)
if not hasattr(stream, "read"):
for item in stream:
if item:
yield item
return
if not isinstance(stream, LimitedStream) and limit is not None:
stream = LimitedStream(stream, limit)
_read = stream.read
while 1:
item = _read(buffer_size)
if not item:
break
yield item
def make_line_iter(stream, limit=None, buffer_size=10 * 1024, cap_at_buffer=False):
"""Safely iterates line-based over an input stream. If the input stream
is not a :class:`LimitedStream` the `limit` parameter is mandatory.
This uses the stream's :meth:`~file.read` method internally as opposite
to the :meth:`~file.readline` method that is unsafe and can only be used
in violation of the WSGI specification. The same problem applies to the
`__iter__` function of the input stream which calls :meth:`~file.readline`
without arguments.
If you need line-by-line processing it's strongly recommended to iterate
over the input stream using this helper function.
.. versionchanged:: 0.8
This function now ensures that the limit was reached.
.. versionadded:: 0.9
added support for iterators as input stream.
.. versionadded:: 0.11.10
added support for the `cap_at_buffer` parameter.
:param stream: the stream or iterate to iterate over.
:param limit: the limit in bytes for the stream. (Usually
content length. Not necessary if the `stream`
is a :class:`LimitedStream`.
:param buffer_size: The optional buffer size.
:param cap_at_buffer: if this is set chunks are split if they are longer
than the buffer size. Internally this is implemented
that the buffer size might be exhausted by a factor
of two however.
"""
_iter = _make_chunk_iter(stream, limit, buffer_size)
first_item = next(_iter, "")
if not first_item:
return
s = make_literal_wrapper(first_item)
empty = s("")
cr = s("\r")
lf = s("\n")
crlf = s("\r\n")
_iter = chain((first_item,), _iter)
def _iter_basic_lines():
_join = empty.join
buffer = []
while 1:
new_data = next(_iter, "")
if not new_data:
break
new_buf = []
buf_size = 0
for item in chain(buffer, new_data.splitlines(True)):
new_buf.append(item)
buf_size += len(item)
if item and item[-1:] in crlf:
yield _join(new_buf)
new_buf = []
elif cap_at_buffer and buf_size >= buffer_size:
rv = _join(new_buf)
while len(rv) >= buffer_size:
yield rv[:buffer_size]
rv = rv[buffer_size:]
new_buf = [rv]
buffer = new_buf
if buffer:
yield _join(buffer)
# This hackery is necessary to merge 'foo\r' and '\n' into one item
# of 'foo\r\n' if we were unlucky and we hit a chunk boundary.
previous = empty
for item in _iter_basic_lines():
if item == lf and previous[-1:] == cr:
previous += item
item = empty
if previous:
yield previous
previous = item
if previous:
yield previous
def make_chunk_iter(
stream, separator, limit=None, buffer_size=10 * 1024, cap_at_buffer=False
):
"""Works like :func:`make_line_iter` but accepts a separator
which divides chunks. If you want newline based processing
you should use :func:`make_line_iter` instead as it
supports arbitrary newline markers.
.. versionadded:: 0.8
.. versionadded:: 0.9
added support for iterators as input stream.
.. versionadded:: 0.11.10
added support for the `cap_at_buffer` parameter.
:param stream: the stream or iterate to iterate over.
:param separator: the separator that divides chunks.
:param limit: the limit in bytes for the stream. (Usually
content length. Not necessary if the `stream`
is otherwise already limited).
:param buffer_size: The optional buffer size.
:param cap_at_buffer: if this is set chunks are split if they are longer
than the buffer size. Internally this is implemented
that the buffer size might be exhausted by a factor
of two however.
"""
_iter = _make_chunk_iter(stream, limit, buffer_size)
first_item = next(_iter, "")
if not first_item:
return
_iter = chain((first_item,), _iter)
if isinstance(first_item, text_type):
separator = to_unicode(separator)
_split = re.compile(r"(%s)" % re.escape(separator)).split
_join = u"".join
else:
separator = to_bytes(separator)
_split = re.compile(b"(" + re.escape(separator) + b")").split
_join = b"".join
buffer = []
while 1:
new_data = next(_iter, "")
if not new_data:
break
chunks = _split(new_data)
new_buf = []
buf_size = 0
for item in chain(buffer, chunks):
if item == separator:
yield _join(new_buf)
new_buf = []
buf_size = 0
else:
buf_size += len(item)
new_buf.append(item)
if cap_at_buffer and buf_size >= buffer_size:
rv = _join(new_buf)
while len(rv) >= buffer_size:
yield rv[:buffer_size]
rv = rv[buffer_size:]
new_buf = [rv]
buf_size = len(rv)
buffer = new_buf
if buffer:
yield _join(buffer)
@implements_iterator
class LimitedStream(io.IOBase):
"""Wraps a stream so that it doesn't read more than n bytes. If the
stream is exhausted and the caller tries to get more bytes from it
:func:`on_exhausted` is called which by default returns an empty
string. The return value of that function is forwarded
to the reader function. So if it returns an empty string
:meth:`read` will return an empty string as well.
The limit however must never be higher than what the stream can
output. Otherwise :meth:`readlines` will try to read past the
limit.
.. admonition:: Note on WSGI compliance
calls to :meth:`readline` and :meth:`readlines` are not
WSGI compliant because it passes a size argument to the
readline methods. Unfortunately the WSGI PEP is not safely
implementable without a size argument to :meth:`readline`
because there is no EOF marker in the stream. As a result
of that the use of :meth:`readline` is discouraged.
For the same reason iterating over the :class:`LimitedStream`
is not portable. It internally calls :meth:`readline`.
We strongly suggest using :meth:`read` only or using the
:func:`make_line_iter` which safely iterates line-based
over a WSGI input stream.
:param stream: the stream to wrap.
:param limit: the limit for the stream, must not be longer than
what the string can provide if the stream does not
end with `EOF` (like `wsgi.input`)
"""
def __init__(self, stream, limit):
self._read = stream.read
self._readline = stream.readline
self._pos = 0
self.limit = limit
def __iter__(self):
return self
@property
def is_exhausted(self):
"""If the stream is exhausted this attribute is `True`."""
return self._pos >= self.limit
def on_exhausted(self):
"""This is called when the stream tries to read past the limit.
The return value of this function is returned from the reading
function.
"""
# Read null bytes from the stream so that we get the
# correct end of stream marker.
return self._read(0)
def on_disconnect(self):
"""What should happen if a disconnect is detected? The return
value of this function is returned from read functions in case
the client went away. By default a
:exc:`~werkzeug.exceptions.ClientDisconnected` exception is raised.
"""
from .exceptions import ClientDisconnected
raise ClientDisconnected()
def exhaust(self, chunk_size=1024 * 64):
"""Exhaust the stream. This consumes all the data left until the
limit is reached.
:param chunk_size: the size for a chunk. It will read the chunk
until the stream is exhausted and throw away
the results.
"""
to_read = self.limit - self._pos
chunk = chunk_size
while to_read > 0:
chunk = min(to_read, chunk)
self.read(chunk)
to_read -= chunk
def read(self, size=None):
"""Read `size` bytes or if size is not provided everything is read.
:param size: the number of bytes read.
"""
if self._pos >= self.limit:
return self.on_exhausted()
if size is None or size == -1: # -1 is for consistence with file
size = self.limit
to_read = min(self.limit - self._pos, size)
try:
read = self._read(to_read)
except (IOError, ValueError):
return self.on_disconnect()
if to_read and len(read) != to_read:
return self.on_disconnect()
self._pos += len(read)
return read
def readline(self, size=None):
"""Reads one line from the stream."""
if self._pos >= self.limit:
return self.on_exhausted()
if size is None:
size = self.limit - self._pos
else:
size = min(size, self.limit - self._pos)
try:
line = self._readline(size)
except (ValueError, IOError):
return self.on_disconnect()
if size and not line:
return self.on_disconnect()
self._pos += len(line)
return line
def readlines(self, size=None):
"""Reads a file into a list of strings. It calls :meth:`readline`
until the file is read to the end. It does support the optional
`size` argument if the underlying stream supports it for
`readline`.
"""
last_pos = self._pos
result = []
if size is not None:
end = min(self.limit, last_pos + size)
else:
end = self.limit
while 1:
if size is not None:
size -= last_pos - self._pos
if self._pos >= end:
break
result.append(self.readline(size))
if size is not None:
last_pos = self._pos
return result
def tell(self):
"""Returns the position of the stream.
.. versionadded:: 0.9
"""
return self._pos
def __next__(self):
line = self.readline()
if not line:
raise StopIteration()
return line
def readable(self):
return True
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/testapp.py
|
# -*- coding: utf-8 -*-
"""
werkzeug.testapp
~~~~~~~~~~~~~~~~
Provide a small test application that can be used to test a WSGI server
and check it for WSGI compliance.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import base64
import os
import sys
from textwrap import wrap
from . import __version__ as _werkzeug_version
from .utils import escape
from .wrappers import BaseRequest as Request
from .wrappers import BaseResponse as Response
logo = Response(
base64.b64decode(
"""
R0lGODlhoACgAOMIAAEDACwpAEpCAGdgAJaKAM28AOnVAP3rAP/////////
//////////////////////yH5BAEKAAgALAAAAACgAKAAAAT+EMlJq704680R+F0ojmRpnuj0rWnrv
nB8rbRs33gu0bzu/0AObxgsGn3D5HHJbCUFyqZ0ukkSDlAidctNFg7gbI9LZlrBaHGtzAae0eloe25
7w9EDOX2fst/xenyCIn5/gFqDiVVDV4aGeYiKkhSFjnCQY5OTlZaXgZp8nJ2ekaB0SQOjqphrpnOiq
ncEn65UsLGytLVmQ6m4sQazpbtLqL/HwpnER8bHyLrLOc3Oz8PRONPU1crXN9na263dMt/g4SzjMeX
m5yDpLqgG7OzJ4u8lT/P69ej3JPn69kHzN2OIAHkB9RUYSFCFQYQJFTIkCDBiwoXWGnowaLEjRm7+G
p9A7Hhx4rUkAUaSLJlxHMqVMD/aSycSZkyTplCqtGnRAM5NQ1Ly5OmzZc6gO4d6DGAUKA+hSocWYAo
SlM6oUWX2O/o0KdaVU5vuSQLAa0ADwQgMEMB2AIECZhVSnTno6spgbtXmHcBUrQACcc2FrTrWS8wAf
78cMFBgwIBgbN+qvTt3ayikRBk7BoyGAGABAdYyfdzRQGV3l4coxrqQ84GpUBmrdR3xNIDUPAKDBSA
ADIGDhhqTZIWaDcrVX8EsbNzbkvCOxG8bN5w8ly9H8jyTJHC6DFndQydbguh2e/ctZJFXRxMAqqPVA
tQH5E64SPr1f0zz7sQYjAHg0In+JQ11+N2B0XXBeeYZgBZFx4tqBToiTCPv0YBgQv8JqA6BEf6RhXx
w1ENhRBnWV8ctEX4Ul2zc3aVGcQNC2KElyTDYyYUWvShdjDyMOGMuFjqnII45aogPhz/CodUHFwaDx
lTgsaOjNyhGWJQd+lFoAGk8ObghI0kawg+EV5blH3dr+digkYuAGSaQZFHFz2P/cTaLmhF52QeSb45
Jwxd+uSVGHlqOZpOeJpCFZ5J+rkAkFjQ0N1tah7JJSZUFNsrkeJUJMIBi8jyaEKIhKPomnC91Uo+NB
yyaJ5umnnpInIFh4t6ZSpGaAVmizqjpByDegYl8tPE0phCYrhcMWSv+uAqHfgH88ak5UXZmlKLVJhd
dj78s1Fxnzo6yUCrV6rrDOkluG+QzCAUTbCwf9SrmMLzK6p+OPHx7DF+bsfMRq7Ec61Av9i6GLw23r
idnZ+/OO0a99pbIrJkproCQMA17OPG6suq3cca5ruDfXCCDoS7BEdvmJn5otdqscn+uogRHHXs8cbh
EIfYaDY1AkrC0cqwcZpnM6ludx72x0p7Fo/hZAcpJDjax0UdHavMKAbiKltMWCF3xxh9k25N/Viud8
ba78iCvUkt+V6BpwMlErmcgc502x+u1nSxJSJP9Mi52awD1V4yB/QHONsnU3L+A/zR4VL/indx/y64
gqcj+qgTeweM86f0Qy1QVbvmWH1D9h+alqg254QD8HJXHvjQaGOqEqC22M54PcftZVKVSQG9jhkv7C
JyTyDoAJfPdu8v7DRZAxsP/ky9MJ3OL36DJfCFPASC3/aXlfLOOON9vGZZHydGf8LnxYJuuVIbl83y
Az5n/RPz07E+9+zw2A2ahz4HxHo9Kt79HTMx1Q7ma7zAzHgHqYH0SoZWyTuOLMiHwSfZDAQTn0ajk9
YQqodnUYjByQZhZak9Wu4gYQsMyEpIOAOQKze8CmEF45KuAHTvIDOfHJNipwoHMuGHBnJElUoDmAyX
c2Qm/R8Ah/iILCCJOEokGowdhDYc/yoL+vpRGwyVSCWFYZNljkhEirGXsalWcAgOdeAdoXcktF2udb
qbUhjWyMQxYO01o6KYKOr6iK3fE4MaS+DsvBsGOBaMb0Y6IxADaJhFICaOLmiWTlDAnY1KzDG4ambL
cWBA8mUzjJsN2KjSaSXGqMCVXYpYkj33mcIApyhQf6YqgeNAmNvuC0t4CsDbSshZJkCS1eNisKqlyG
cF8G2JeiDX6tO6Mv0SmjCa3MFb0bJaGPMU0X7c8XcpvMaOQmCajwSeY9G0WqbBmKv34DsMIEztU6Y2
KiDlFdt6jnCSqx7Dmt6XnqSKaFFHNO5+FmODxMCWBEaco77lNDGXBM0ECYB/+s7nKFdwSF5hgXumQe
EZ7amRg39RHy3zIjyRCykQh8Zo2iviRKyTDn/zx6EefptJj2Cw+Ep2FSc01U5ry4KLPYsTyWnVGnvb
UpyGlhjBUljyjHhWpf8OFaXwhp9O4T1gU9UeyPPa8A2l0p1kNqPXEVRm1AOs1oAGZU596t6SOR2mcB
Oco1srWtkaVrMUzIErrKri85keKqRQYX9VX0/eAUK1hrSu6HMEX3Qh2sCh0q0D2CtnUqS4hj62sE/z
aDs2Sg7MBS6xnQeooc2R2tC9YrKpEi9pLXfYXp20tDCpSP8rKlrD4axprb9u1Df5hSbz9QU0cRpfgn
kiIzwKucd0wsEHlLpe5yHXuc6FrNelOl7pY2+11kTWx7VpRu97dXA3DO1vbkhcb4zyvERYajQgAADs
="""
),
mimetype="image/png",
)
TEMPLATE = u"""\
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<title>WSGI Information</title>
<style type="text/css">
@import url(https://fonts.googleapis.com/css?family=Ubuntu);
body { font-family: 'Lucida Grande', 'Lucida Sans Unicode', 'Geneva',
'Verdana', sans-serif; background-color: white; color: #000;
font-size: 15px; text-align: center; }
#logo { float: right; padding: 0 0 10px 10px; }
div.box { text-align: left; width: 45em; margin: auto; padding: 50px 0;
background-color: white; }
h1, h2 { font-family: 'Ubuntu', 'Lucida Grande', 'Lucida Sans Unicode',
'Geneva', 'Verdana', sans-serif; font-weight: normal; }
h1 { margin: 0 0 30px 0; }
h2 { font-size: 1.4em; margin: 1em 0 0.5em 0; }
table { width: 100%%; border-collapse: collapse; border: 1px solid #AFC5C9 }
table th { background-color: #AFC1C4; color: white; font-size: 0.72em;
font-weight: normal; width: 18em; vertical-align: top;
padding: 0.5em 0 0.1em 0.5em; }
table td { border: 1px solid #AFC5C9; padding: 0.1em 0 0.1em 0.5em; }
code { font-family: 'Consolas', 'Monaco', 'Bitstream Vera Sans Mono',
monospace; font-size: 0.7em; }
ul li { line-height: 1.5em; }
ul.path { font-size: 0.7em; margin: 0 -30px; padding: 8px 30px;
list-style: none; background: #E8EFF0; }
ul.path li { line-height: 1.6em; }
li.virtual { color: #999; text-decoration: underline; }
li.exp { background: white; }
</style>
<div class="box">
<img src="?resource=logo" id="logo" alt="[The Werkzeug Logo]" />
<h1>WSGI Information</h1>
<p>
This page displays all available information about the WSGI server and
the underlying Python interpreter.
<h2 id="python-interpreter">Python Interpreter</h2>
<table>
<tr>
<th>Python Version
<td>%(python_version)s
<tr>
<th>Platform
<td>%(platform)s [%(os)s]
<tr>
<th>API Version
<td>%(api_version)s
<tr>
<th>Byteorder
<td>%(byteorder)s
<tr>
<th>Werkzeug Version
<td>%(werkzeug_version)s
</table>
<h2 id="wsgi-environment">WSGI Environment</h2>
<table>%(wsgi_env)s</table>
<h2 id="installed-eggs">Installed Eggs</h2>
<p>
The following python packages were installed on the system as
Python eggs:
<ul>%(python_eggs)s</ul>
<h2 id="sys-path">System Path</h2>
<p>
The following paths are the current contents of the load path. The
following entries are looked up for Python packages. Note that not
all items in this path are folders. Gray and underlined items are
entries pointing to invalid resources or used by custom import hooks
such as the zip importer.
<p>
Items with a bright background were expanded for display from a relative
path. If you encounter such paths in the output you might want to check
your setup as relative paths are usually problematic in multithreaded
environments.
<ul class="path">%(sys_path)s</ul>
</div>
"""
def iter_sys_path():
if os.name == "posix":
def strip(x):
prefix = os.path.expanduser("~")
if x.startswith(prefix):
x = "~" + x[len(prefix) :]
return x
else:
def strip(x):
return x
cwd = os.path.abspath(os.getcwd())
for item in sys.path:
path = os.path.join(cwd, item or os.path.curdir)
yield strip(os.path.normpath(path)), not os.path.isdir(path), path != item
def render_testapp(req):
try:
import pkg_resources
except ImportError:
eggs = ()
else:
eggs = sorted(pkg_resources.working_set, key=lambda x: x.project_name.lower())
python_eggs = []
for egg in eggs:
try:
version = egg.version
except (ValueError, AttributeError):
version = "unknown"
python_eggs.append(
"<li>%s <small>[%s]</small>" % (escape(egg.project_name), escape(version))
)
wsgi_env = []
sorted_environ = sorted(req.environ.items(), key=lambda x: repr(x[0]).lower())
for key, value in sorted_environ:
wsgi_env.append(
"<tr><th>%s<td><code>%s</code>"
% (escape(str(key)), " ".join(wrap(escape(repr(value)))))
)
sys_path = []
for item, virtual, expanded in iter_sys_path():
class_ = []
if virtual:
class_.append("virtual")
if expanded:
class_.append("exp")
sys_path.append(
"<li%s>%s"
% (' class="%s"' % " ".join(class_) if class_ else "", escape(item))
)
return (
TEMPLATE
% {
"python_version": "<br>".join(escape(sys.version).splitlines()),
"platform": escape(sys.platform),
"os": escape(os.name),
"api_version": sys.api_version,
"byteorder": sys.byteorder,
"werkzeug_version": _werkzeug_version,
"python_eggs": "\n".join(python_eggs),
"wsgi_env": "\n".join(wsgi_env),
"sys_path": "\n".join(sys_path),
}
).encode("utf-8")
def test_app(environ, start_response):
"""Simple test application that dumps the environment. You can use
it to check if Werkzeug is working properly:
.. sourcecode:: pycon
>>> from werkzeug.serving import run_simple
>>> from werkzeug.testapp import test_app
>>> run_simple('localhost', 3000, test_app)
* Running on http://localhost:3000/
The application displays important information from the WSGI environment,
the Python interpreter and the installed libraries.
"""
req = Request(environ, populate_request=False)
if req.args.get("resource") == "logo":
response = logo
else:
response = Response(render_testapp(req), mimetype="text/html")
return response(environ, start_response)
if __name__ == "__main__":
from .serving import run_simple
run_simple("localhost", 5000, test_app, use_reloader=True)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/middleware/dispatcher.py
|
"""
Application Dispatcher
======================
This middleware creates a single WSGI application that dispatches to
multiple other WSGI applications mounted at different URL paths.
A common example is writing a Single Page Application, where you have a
backend API and a frontend written in JavaScript that does the routing
in the browser rather than requesting different pages from the server.
The frontend is a single HTML and JS file that should be served for any
path besides "/api".
This example dispatches to an API app under "/api", an admin app
under "/admin", and an app that serves frontend files for all other
requests::
app = DispatcherMiddleware(serve_frontend, {
'/api': api_app,
'/admin': admin_app,
})
In production, you might instead handle this at the HTTP server level,
serving files or proxying to application servers based on location. The
API and admin apps would each be deployed with a separate WSGI server,
and the static files would be served directly by the HTTP server.
.. autoclass:: DispatcherMiddleware
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
class DispatcherMiddleware(object):
"""Combine multiple applications as a single WSGI application.
Requests are dispatched to an application based on the path it is
mounted under.
:param app: The WSGI application to dispatch to if the request
doesn't match a mounted path.
:param mounts: Maps path prefixes to applications for dispatching.
"""
def __init__(self, app, mounts=None):
self.app = app
self.mounts = mounts or {}
def __call__(self, environ, start_response):
script = environ.get("PATH_INFO", "")
path_info = ""
while "/" in script:
if script in self.mounts:
app = self.mounts[script]
break
script, last_item = script.rsplit("/", 1)
path_info = "/%s%s" % (last_item, path_info)
else:
app = self.mounts.get(script, self.app)
original_script_name = environ.get("SCRIPT_NAME", "")
environ["SCRIPT_NAME"] = original_script_name + script
environ["PATH_INFO"] = path_info
return app(environ, start_response)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/middleware/proxy_fix.py
|
"""
X-Forwarded-For Proxy Fix
=========================
This module provides a middleware that adjusts the WSGI environ based on
``X-Forwarded-`` headers that proxies in front of an application may
set.
When an application is running behind a proxy server, WSGI may see the
request as coming from that server rather than the real client. Proxies
set various headers to track where the request actually came from.
This middleware should only be applied if the application is actually
behind such a proxy, and should be configured with the number of proxies
that are chained in front of it. Not all proxies set all the headers.
Since incoming headers can be faked, you must set how many proxies are
setting each header so the middleware knows what to trust.
.. autoclass:: ProxyFix
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
from werkzeug.http import parse_list_header
class ProxyFix(object):
"""Adjust the WSGI environ based on ``X-Forwarded-`` that proxies in
front of the application may set.
- ``X-Forwarded-For`` sets ``REMOTE_ADDR``.
- ``X-Forwarded-Proto`` sets ``wsgi.url_scheme``.
- ``X-Forwarded-Host`` sets ``HTTP_HOST``, ``SERVER_NAME``, and
``SERVER_PORT``.
- ``X-Forwarded-Port`` sets ``HTTP_HOST`` and ``SERVER_PORT``.
- ``X-Forwarded-Prefix`` sets ``SCRIPT_NAME``.
You must tell the middleware how many proxies set each header so it
knows what values to trust. It is a security issue to trust values
that came from the client rather than a proxy.
The original values of the headers are stored in the WSGI
environ as ``werkzeug.proxy_fix.orig``, a dict.
:param app: The WSGI application to wrap.
:param x_for: Number of values to trust for ``X-Forwarded-For``.
:param x_proto: Number of values to trust for ``X-Forwarded-Proto``.
:param x_host: Number of values to trust for ``X-Forwarded-Host``.
:param x_port: Number of values to trust for ``X-Forwarded-Port``.
:param x_prefix: Number of values to trust for
``X-Forwarded-Prefix``.
.. code-block:: python
from werkzeug.middleware.proxy_fix import ProxyFix
# App is behind one proxy that sets the -For and -Host headers.
app = ProxyFix(app, x_for=1, x_host=1)
.. versionchanged:: 1.0
Deprecated code has been removed:
* The ``num_proxies`` argument and attribute.
* The ``get_remote_addr`` method.
* The environ keys ``orig_remote_addr``,
``orig_wsgi_url_scheme``, and ``orig_http_host``.
.. versionchanged:: 0.15
All headers support multiple values. The ``num_proxies``
argument is deprecated. Each header is configured with a
separate number of trusted proxies.
.. versionchanged:: 0.15
Original WSGI environ values are stored in the
``werkzeug.proxy_fix.orig`` dict. ``orig_remote_addr``,
``orig_wsgi_url_scheme``, and ``orig_http_host`` are deprecated
and will be removed in 1.0.
.. versionchanged:: 0.15
Support ``X-Forwarded-Port`` and ``X-Forwarded-Prefix``.
.. versionchanged:: 0.15
``X-Forwarded-Host`` and ``X-Forwarded-Port`` modify
``SERVER_NAME`` and ``SERVER_PORT``.
"""
def __init__(self, app, x_for=1, x_proto=1, x_host=0, x_port=0, x_prefix=0):
self.app = app
self.x_for = x_for
self.x_proto = x_proto
self.x_host = x_host
self.x_port = x_port
self.x_prefix = x_prefix
def _get_real_value(self, trusted, value):
"""Get the real value from a list header based on the configured
number of trusted proxies.
:param trusted: Number of values to trust in the header.
:param value: Comma separated list header value to parse.
:return: The real value, or ``None`` if there are fewer values
than the number of trusted proxies.
.. versionchanged:: 1.0
Renamed from ``_get_trusted_comma``.
.. versionadded:: 0.15
"""
if not (trusted and value):
return
values = parse_list_header(value)
if len(values) >= trusted:
return values[-trusted]
def __call__(self, environ, start_response):
"""Modify the WSGI environ based on the various ``Forwarded``
headers before calling the wrapped application. Store the
original environ values in ``werkzeug.proxy_fix.orig_{key}``.
"""
environ_get = environ.get
orig_remote_addr = environ_get("REMOTE_ADDR")
orig_wsgi_url_scheme = environ_get("wsgi.url_scheme")
orig_http_host = environ_get("HTTP_HOST")
environ.update(
{
"werkzeug.proxy_fix.orig": {
"REMOTE_ADDR": orig_remote_addr,
"wsgi.url_scheme": orig_wsgi_url_scheme,
"HTTP_HOST": orig_http_host,
"SERVER_NAME": environ_get("SERVER_NAME"),
"SERVER_PORT": environ_get("SERVER_PORT"),
"SCRIPT_NAME": environ_get("SCRIPT_NAME"),
}
}
)
x_for = self._get_real_value(self.x_for, environ_get("HTTP_X_FORWARDED_FOR"))
if x_for:
environ["REMOTE_ADDR"] = x_for
x_proto = self._get_real_value(
self.x_proto, environ_get("HTTP_X_FORWARDED_PROTO")
)
if x_proto:
environ["wsgi.url_scheme"] = x_proto
x_host = self._get_real_value(self.x_host, environ_get("HTTP_X_FORWARDED_HOST"))
if x_host:
environ["HTTP_HOST"] = x_host
parts = x_host.split(":", 1)
environ["SERVER_NAME"] = parts[0]
if len(parts) == 2:
environ["SERVER_PORT"] = parts[1]
x_port = self._get_real_value(self.x_port, environ_get("HTTP_X_FORWARDED_PORT"))
if x_port:
host = environ.get("HTTP_HOST")
if host:
parts = host.split(":", 1)
host = parts[0] if len(parts) == 2 else host
environ["HTTP_HOST"] = "%s:%s" % (host, x_port)
environ["SERVER_PORT"] = x_port
x_prefix = self._get_real_value(
self.x_prefix, environ_get("HTTP_X_FORWARDED_PREFIX")
)
if x_prefix:
environ["SCRIPT_NAME"] = x_prefix
return self.app(environ, start_response)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/middleware/shared_data.py
|
"""
Serve Shared Static Files
=========================
.. autoclass:: SharedDataMiddleware
:members: is_allowed
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import mimetypes
import os
import pkgutil
import posixpath
from datetime import datetime
from io import BytesIO
from time import mktime
from time import time
from zlib import adler32
from .._compat import PY2
from .._compat import string_types
from ..filesystem import get_filesystem_encoding
from ..http import http_date
from ..http import is_resource_modified
from ..security import safe_join
from ..utils import get_content_type
from ..wsgi import get_path_info
from ..wsgi import wrap_file
class SharedDataMiddleware(object):
"""A WSGI middleware that provides static content for development
environments or simple server setups. Usage is quite simple::
import os
from werkzeug.middleware.shared_data import SharedDataMiddleware
app = SharedDataMiddleware(app, {
'/static': os.path.join(os.path.dirname(__file__), 'static')
})
The contents of the folder ``./shared`` will now be available on
``http://example.com/shared/``. This is pretty useful during development
because a standalone media server is not required. One can also mount
files on the root folder and still continue to use the application because
the shared data middleware forwards all unhandled requests to the
application, even if the requests are below one of the shared folders.
If `pkg_resources` is available you can also tell the middleware to serve
files from package data::
app = SharedDataMiddleware(app, {
'/static': ('myapplication', 'static')
})
This will then serve the ``static`` folder in the `myapplication`
Python package.
The optional `disallow` parameter can be a list of :func:`~fnmatch.fnmatch`
rules for files that are not accessible from the web. If `cache` is set to
`False` no caching headers are sent.
Currently the middleware does not support non ASCII filenames. If the
encoding on the file system happens to be the encoding of the URI it may
work but this could also be by accident. We strongly suggest using ASCII
only file names for static files.
The middleware will guess the mimetype using the Python `mimetype`
module. If it's unable to figure out the charset it will fall back
to `fallback_mimetype`.
:param app: the application to wrap. If you don't want to wrap an
application you can pass it :exc:`NotFound`.
:param exports: a list or dict of exported files and folders.
:param disallow: a list of :func:`~fnmatch.fnmatch` rules.
:param cache: enable or disable caching headers.
:param cache_timeout: the cache timeout in seconds for the headers.
:param fallback_mimetype: The fallback mimetype for unknown files.
.. versionchanged:: 1.0
The default ``fallback_mimetype`` is
``application/octet-stream``. If a filename looks like a text
mimetype, the ``utf-8`` charset is added to it.
.. versionadded:: 0.6
Added ``fallback_mimetype``.
.. versionchanged:: 0.5
Added ``cache_timeout``.
"""
def __init__(
self,
app,
exports,
disallow=None,
cache=True,
cache_timeout=60 * 60 * 12,
fallback_mimetype="application/octet-stream",
):
self.app = app
self.exports = []
self.cache = cache
self.cache_timeout = cache_timeout
if hasattr(exports, "items"):
exports = exports.items()
for key, value in exports:
if isinstance(value, tuple):
loader = self.get_package_loader(*value)
elif isinstance(value, string_types):
if os.path.isfile(value):
loader = self.get_file_loader(value)
else:
loader = self.get_directory_loader(value)
else:
raise TypeError("unknown def %r" % value)
self.exports.append((key, loader))
if disallow is not None:
from fnmatch import fnmatch
self.is_allowed = lambda x: not fnmatch(x, disallow)
self.fallback_mimetype = fallback_mimetype
def is_allowed(self, filename):
"""Subclasses can override this method to disallow the access to
certain files. However by providing `disallow` in the constructor
this method is overwritten.
"""
return True
def _opener(self, filename):
return lambda: (
open(filename, "rb"),
datetime.utcfromtimestamp(os.path.getmtime(filename)),
int(os.path.getsize(filename)),
)
def get_file_loader(self, filename):
return lambda x: (os.path.basename(filename), self._opener(filename))
def get_package_loader(self, package, package_path):
loadtime = datetime.utcnow()
provider = pkgutil.get_loader(package)
if hasattr(provider, "get_resource_reader"):
# Python 3
reader = provider.get_resource_reader(package)
def loader(path):
if path is None:
return None, None
path = safe_join(package_path, path)
basename = posixpath.basename(path)
try:
resource = reader.open_resource(path)
except IOError:
return None, None
if isinstance(resource, BytesIO):
return (
basename,
lambda: (resource, loadtime, len(resource.getvalue())),
)
return (
basename,
lambda: (
resource,
datetime.utcfromtimestamp(os.path.getmtime(resource.name)),
os.path.getsize(resource.name),
),
)
else:
# Python 2
package_filename = provider.get_filename(package)
is_filesystem = os.path.exists(package_filename)
root = os.path.join(os.path.dirname(package_filename), package_path)
def loader(path):
if path is None:
return None, None
path = safe_join(root, path)
basename = posixpath.basename(path)
if is_filesystem:
if not os.path.isfile(path):
return None, None
return basename, self._opener(path)
try:
data = provider.get_data(path)
except IOError:
return None, None
return basename, lambda: (BytesIO(data), loadtime, len(data))
return loader
def get_directory_loader(self, directory):
def loader(path):
if path is not None:
path = safe_join(directory, path)
else:
path = directory
if os.path.isfile(path):
return os.path.basename(path), self._opener(path)
return None, None
return loader
def generate_etag(self, mtime, file_size, real_filename):
if not isinstance(real_filename, bytes):
real_filename = real_filename.encode(get_filesystem_encoding())
return "wzsdm-%d-%s-%s" % (
mktime(mtime.timetuple()),
file_size,
adler32(real_filename) & 0xFFFFFFFF,
)
def __call__(self, environ, start_response):
path = get_path_info(environ)
if PY2:
path = path.encode(get_filesystem_encoding())
file_loader = None
for search_path, loader in self.exports:
if search_path == path:
real_filename, file_loader = loader(None)
if file_loader is not None:
break
if not search_path.endswith("/"):
search_path += "/"
if path.startswith(search_path):
real_filename, file_loader = loader(path[len(search_path) :])
if file_loader is not None:
break
if file_loader is None or not self.is_allowed(real_filename):
return self.app(environ, start_response)
guessed_type = mimetypes.guess_type(real_filename)
mime_type = get_content_type(guessed_type[0] or self.fallback_mimetype, "utf-8")
f, mtime, file_size = file_loader()
headers = [("Date", http_date())]
if self.cache:
timeout = self.cache_timeout
etag = self.generate_etag(mtime, file_size, real_filename)
headers += [
("Etag", '"%s"' % etag),
("Cache-Control", "max-age=%d, public" % timeout),
]
if not is_resource_modified(environ, etag, last_modified=mtime):
f.close()
start_response("304 Not Modified", headers)
return []
headers.append(("Expires", http_date(time() + timeout)))
else:
headers.append(("Cache-Control", "public"))
headers.extend(
(
("Content-Type", mime_type),
("Content-Length", str(file_size)),
("Last-Modified", http_date(mtime)),
)
)
start_response("200 OK", headers)
return wrap_file(environ, f)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/middleware/http_proxy.py
|
"""
Basic HTTP Proxy
================
.. autoclass:: ProxyMiddleware
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import socket
from ..datastructures import EnvironHeaders
from ..http import is_hop_by_hop_header
from ..urls import url_parse
from ..urls import url_quote
from ..wsgi import get_input_stream
try:
from http import client
except ImportError:
import httplib as client
class ProxyMiddleware(object):
"""Proxy requests under a path to an external server, routing other
requests to the app.
This middleware can only proxy HTTP requests, as that is the only
protocol handled by the WSGI server. Other protocols, such as
websocket requests, cannot be proxied at this layer. This should
only be used for development, in production a real proxying server
should be used.
The middleware takes a dict that maps a path prefix to a dict
describing the host to be proxied to::
app = ProxyMiddleware(app, {
"/static/": {
"target": "http://127.0.0.1:5001/",
}
})
Each host has the following options:
``target``:
The target URL to dispatch to. This is required.
``remove_prefix``:
Whether to remove the prefix from the URL before dispatching it
to the target. The default is ``False``.
``host``:
``"<auto>"`` (default):
The host header is automatically rewritten to the URL of the
target.
``None``:
The host header is unmodified from the client request.
Any other value:
The host header is overwritten with the value.
``headers``:
A dictionary of headers to be sent with the request to the
target. The default is ``{}``.
``ssl_context``:
A :class:`ssl.SSLContext` defining how to verify requests if the
target is HTTPS. The default is ``None``.
In the example above, everything under ``"/static/"`` is proxied to
the server on port 5001. The host header is rewritten to the target,
and the ``"/static/"`` prefix is removed from the URLs.
:param app: The WSGI application to wrap.
:param targets: Proxy target configurations. See description above.
:param chunk_size: Size of chunks to read from input stream and
write to target.
:param timeout: Seconds before an operation to a target fails.
.. versionadded:: 0.14
"""
def __init__(self, app, targets, chunk_size=2 << 13, timeout=10):
def _set_defaults(opts):
opts.setdefault("remove_prefix", False)
opts.setdefault("host", "<auto>")
opts.setdefault("headers", {})
opts.setdefault("ssl_context", None)
return opts
self.app = app
self.targets = dict(
("/%s/" % k.strip("/"), _set_defaults(v)) for k, v in targets.items()
)
self.chunk_size = chunk_size
self.timeout = timeout
def proxy_to(self, opts, path, prefix):
target = url_parse(opts["target"])
def application(environ, start_response):
headers = list(EnvironHeaders(environ).items())
headers[:] = [
(k, v)
for k, v in headers
if not is_hop_by_hop_header(k)
and k.lower() not in ("content-length", "host")
]
headers.append(("Connection", "close"))
if opts["host"] == "<auto>":
headers.append(("Host", target.ascii_host))
elif opts["host"] is None:
headers.append(("Host", environ["HTTP_HOST"]))
else:
headers.append(("Host", opts["host"]))
headers.extend(opts["headers"].items())
remote_path = path
if opts["remove_prefix"]:
remote_path = "%s/%s" % (
target.path.rstrip("/"),
remote_path[len(prefix) :].lstrip("/"),
)
content_length = environ.get("CONTENT_LENGTH")
chunked = False
if content_length not in ("", None):
headers.append(("Content-Length", content_length))
elif content_length is not None:
headers.append(("Transfer-Encoding", "chunked"))
chunked = True
try:
if target.scheme == "http":
con = client.HTTPConnection(
target.ascii_host, target.port or 80, timeout=self.timeout
)
elif target.scheme == "https":
con = client.HTTPSConnection(
target.ascii_host,
target.port or 443,
timeout=self.timeout,
context=opts["ssl_context"],
)
else:
raise RuntimeError(
"Target scheme must be 'http' or 'https', got '{}'.".format(
target.scheme
)
)
con.connect()
remote_url = url_quote(remote_path)
querystring = environ["QUERY_STRING"]
if querystring:
remote_url = remote_url + "?" + querystring
con.putrequest(environ["REQUEST_METHOD"], remote_url, skip_host=True)
for k, v in headers:
if k.lower() == "connection":
v = "close"
con.putheader(k, v)
con.endheaders()
stream = get_input_stream(environ)
while 1:
data = stream.read(self.chunk_size)
if not data:
break
if chunked:
con.send(b"%x\r\n%s\r\n" % (len(data), data))
else:
con.send(data)
resp = con.getresponse()
except socket.error:
from ..exceptions import BadGateway
return BadGateway()(environ, start_response)
start_response(
"%d %s" % (resp.status, resp.reason),
[
(k.title(), v)
for k, v in resp.getheaders()
if not is_hop_by_hop_header(k)
],
)
def read():
while 1:
try:
data = resp.read(self.chunk_size)
except socket.error:
break
if not data:
break
yield data
return read()
return application
def __call__(self, environ, start_response):
path = environ["PATH_INFO"]
app = self.app
for prefix, opts in self.targets.items():
if path.startswith(prefix):
app = self.proxy_to(opts, path, prefix)
break
return app(environ, start_response)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/middleware/__init__.py
|
"""
Middleware
==========
A WSGI middleware is a WSGI application that wraps another application
in order to observe or change its behavior. Werkzeug provides some
middleware for common use cases.
.. toctree::
:maxdepth: 1
proxy_fix
shared_data
dispatcher
http_proxy
lint
profiler
The :doc:`interactive debugger </debug>` is also a middleware that can
be applied manually, although it is typically used automatically with
the :doc:`development server </serving>`.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/middleware/profiler.py
|
"""
Application Profiler
====================
This module provides a middleware that profiles each request with the
:mod:`cProfile` module. This can help identify bottlenecks in your code
that may be slowing down your application.
.. autoclass:: ProfilerMiddleware
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
from __future__ import print_function
import os.path
import sys
import time
from pstats import Stats
try:
from cProfile import Profile
except ImportError:
from profile import Profile
class ProfilerMiddleware(object):
"""Wrap a WSGI application and profile the execution of each
request. Responses are buffered so that timings are more exact.
If ``stream`` is given, :class:`pstats.Stats` are written to it
after each request. If ``profile_dir`` is given, :mod:`cProfile`
data files are saved to that directory, one file per request.
The filename can be customized by passing ``filename_format``. If
it is a string, it will be formatted using :meth:`str.format` with
the following fields available:
- ``{method}`` - The request method; GET, POST, etc.
- ``{path}`` - The request path or 'root' should one not exist.
- ``{elapsed}`` - The elapsed time of the request.
- ``{time}`` - The time of the request.
If it is a callable, it will be called with the WSGI ``environ``
dict and should return a filename.
:param app: The WSGI application to wrap.
:param stream: Write stats to this stream. Disable with ``None``.
:param sort_by: A tuple of columns to sort stats by. See
:meth:`pstats.Stats.sort_stats`.
:param restrictions: A tuple of restrictions to filter stats by. See
:meth:`pstats.Stats.print_stats`.
:param profile_dir: Save profile data files to this directory.
:param filename_format: Format string for profile data file names,
or a callable returning a name. See explanation above.
.. code-block:: python
from werkzeug.middleware.profiler import ProfilerMiddleware
app = ProfilerMiddleware(app)
.. versionchanged:: 0.15
Stats are written even if ``profile_dir`` is given, and can be
disable by passing ``stream=None``.
.. versionadded:: 0.15
Added ``filename_format``.
.. versionadded:: 0.9
Added ``restrictions`` and ``profile_dir``.
"""
def __init__(
self,
app,
stream=sys.stdout,
sort_by=("time", "calls"),
restrictions=(),
profile_dir=None,
filename_format="{method}.{path}.{elapsed:.0f}ms.{time:.0f}.prof",
):
self._app = app
self._stream = stream
self._sort_by = sort_by
self._restrictions = restrictions
self._profile_dir = profile_dir
self._filename_format = filename_format
def __call__(self, environ, start_response):
response_body = []
def catching_start_response(status, headers, exc_info=None):
start_response(status, headers, exc_info)
return response_body.append
def runapp():
app_iter = self._app(environ, catching_start_response)
response_body.extend(app_iter)
if hasattr(app_iter, "close"):
app_iter.close()
profile = Profile()
start = time.time()
profile.runcall(runapp)
body = b"".join(response_body)
elapsed = time.time() - start
if self._profile_dir is not None:
if callable(self._filename_format):
filename = self._filename_format(environ)
else:
filename = self._filename_format.format(
method=environ["REQUEST_METHOD"],
path=(
environ.get("PATH_INFO").strip("/").replace("/", ".") or "root"
),
elapsed=elapsed * 1000.0,
time=time.time(),
)
filename = os.path.join(self._profile_dir, filename)
profile.dump_stats(filename)
if self._stream is not None:
stats = Stats(profile, stream=self._stream)
stats.sort_stats(*self._sort_by)
print("-" * 80, file=self._stream)
print("PATH: {!r}".format(environ.get("PATH_INFO", "")), file=self._stream)
stats.print_stats(*self._restrictions)
print("-" * 80 + "\n", file=self._stream)
return [body]
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/middleware/lint.py
|
"""
WSGI Protocol Linter
====================
This module provides a middleware that performs sanity checks on the
behavior of the WSGI server and application. It checks that the
:pep:`3333` WSGI spec is properly implemented. It also warns on some
common HTTP errors such as non-empty responses for 304 status codes.
.. autoclass:: LintMiddleware
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
from warnings import warn
from .._compat import implements_iterator
from .._compat import PY2
from .._compat import string_types
from ..datastructures import Headers
from ..http import is_entity_header
from ..wsgi import FileWrapper
try:
from urllib.parse import urlparse
except ImportError:
from urlparse import urlparse
class WSGIWarning(Warning):
"""Warning class for WSGI warnings."""
class HTTPWarning(Warning):
"""Warning class for HTTP warnings."""
def check_string(context, obj, stacklevel=3):
if type(obj) is not str:
warn(
"'%s' requires strings, got '%s'" % (context, type(obj).__name__),
WSGIWarning,
)
class InputStream(object):
def __init__(self, stream):
self._stream = stream
def read(self, *args):
if len(args) == 0:
warn(
"WSGI does not guarantee an EOF marker on the input stream, thus making"
" calls to 'wsgi.input.read()' unsafe. Conforming servers may never"
" return from this call.",
WSGIWarning,
stacklevel=2,
)
elif len(args) != 1:
warn(
"Too many parameters passed to 'wsgi.input.read()'.",
WSGIWarning,
stacklevel=2,
)
return self._stream.read(*args)
def readline(self, *args):
if len(args) == 0:
warn(
"Calls to 'wsgi.input.readline()' without arguments are unsafe. Use"
" 'wsgi.input.read()' instead.",
WSGIWarning,
stacklevel=2,
)
elif len(args) == 1:
warn(
"'wsgi.input.readline()' was called with a size hint. WSGI does not"
" support this, although it's available on all major servers.",
WSGIWarning,
stacklevel=2,
)
else:
raise TypeError("Too many arguments passed to 'wsgi.input.readline()'.")
return self._stream.readline(*args)
def __iter__(self):
try:
return iter(self._stream)
except TypeError:
warn("'wsgi.input' is not iterable.", WSGIWarning, stacklevel=2)
return iter(())
def close(self):
warn("The application closed the input stream!", WSGIWarning, stacklevel=2)
self._stream.close()
class ErrorStream(object):
def __init__(self, stream):
self._stream = stream
def write(self, s):
check_string("wsgi.error.write()", s)
self._stream.write(s)
def flush(self):
self._stream.flush()
def writelines(self, seq):
for line in seq:
self.write(line)
def close(self):
warn("The application closed the error stream!", WSGIWarning, stacklevel=2)
self._stream.close()
class GuardedWrite(object):
def __init__(self, write, chunks):
self._write = write
self._chunks = chunks
def __call__(self, s):
check_string("write()", s)
self._write.write(s)
self._chunks.append(len(s))
@implements_iterator
class GuardedIterator(object):
def __init__(self, iterator, headers_set, chunks):
self._iterator = iterator
if PY2:
self._next = iter(iterator).next
else:
self._next = iter(iterator).__next__
self.closed = False
self.headers_set = headers_set
self.chunks = chunks
def __iter__(self):
return self
def __next__(self):
if self.closed:
warn("Iterated over closed 'app_iter'.", WSGIWarning, stacklevel=2)
rv = self._next()
if not self.headers_set:
warn(
"The application returned before it started the response.",
WSGIWarning,
stacklevel=2,
)
check_string("application iterator items", rv)
self.chunks.append(len(rv))
return rv
def close(self):
self.closed = True
if hasattr(self._iterator, "close"):
self._iterator.close()
if self.headers_set:
status_code, headers = self.headers_set
bytes_sent = sum(self.chunks)
content_length = headers.get("content-length", type=int)
if status_code == 304:
for key, _value in headers:
key = key.lower()
if key not in ("expires", "content-location") and is_entity_header(
key
):
warn(
"Entity header %r found in 304 response." % key, HTTPWarning
)
if bytes_sent:
warn("304 responses must not have a body.", HTTPWarning)
elif 100 <= status_code < 200 or status_code == 204:
if content_length != 0:
warn(
"%r responses must have an empty content length." % status_code,
HTTPWarning,
)
if bytes_sent:
warn(
"%r responses must not have a body." % status_code, HTTPWarning
)
elif content_length is not None and content_length != bytes_sent:
warn(
"Content-Length and the number of bytes sent to the client do not"
" match.",
WSGIWarning,
)
def __del__(self):
if not self.closed:
try:
warn(
"Iterator was garbage collected before it was closed.", WSGIWarning
)
except Exception:
pass
class LintMiddleware(object):
"""Warns about common errors in the WSGI and HTTP behavior of the
server and wrapped application. Some of the issues it check are:
- invalid status codes
- non-bytestrings sent to the WSGI server
- strings returned from the WSGI application
- non-empty conditional responses
- unquoted etags
- relative URLs in the Location header
- unsafe calls to wsgi.input
- unclosed iterators
Error information is emitted using the :mod:`warnings` module.
:param app: The WSGI application to wrap.
.. code-block:: python
from werkzeug.middleware.lint import LintMiddleware
app = LintMiddleware(app)
"""
def __init__(self, app):
self.app = app
def check_environ(self, environ):
if type(environ) is not dict:
warn(
"WSGI environment is not a standard Python dict.",
WSGIWarning,
stacklevel=4,
)
for key in (
"REQUEST_METHOD",
"SERVER_NAME",
"SERVER_PORT",
"wsgi.version",
"wsgi.input",
"wsgi.errors",
"wsgi.multithread",
"wsgi.multiprocess",
"wsgi.run_once",
):
if key not in environ:
warn(
"Required environment key %r not found" % key,
WSGIWarning,
stacklevel=3,
)
if environ["wsgi.version"] != (1, 0):
warn("Environ is not a WSGI 1.0 environ.", WSGIWarning, stacklevel=3)
script_name = environ.get("SCRIPT_NAME", "")
path_info = environ.get("PATH_INFO", "")
if script_name and script_name[0] != "/":
warn(
"'SCRIPT_NAME' does not start with a slash: %r" % script_name,
WSGIWarning,
stacklevel=3,
)
if path_info and path_info[0] != "/":
warn(
"'PATH_INFO' does not start with a slash: %r" % path_info,
WSGIWarning,
stacklevel=3,
)
def check_start_response(self, status, headers, exc_info):
check_string("status", status)
status_code = status.split(None, 1)[0]
if len(status_code) != 3 or not status_code.isdigit():
warn(WSGIWarning("Status code must be three digits"), stacklevel=3)
if len(status) < 4 or status[3] != " ":
warn(
WSGIWarning(
"Invalid value for status %r. Valid "
"status strings are three digits, a space "
"and a status explanation"
),
stacklevel=3,
)
status_code = int(status_code)
if status_code < 100:
warn(WSGIWarning("status code < 100 detected"), stacklevel=3)
if type(headers) is not list:
warn(WSGIWarning("header list is not a list"), stacklevel=3)
for item in headers:
if type(item) is not tuple or len(item) != 2:
warn(WSGIWarning("Headers must tuple 2-item tuples"), stacklevel=3)
name, value = item
if type(name) is not str or type(value) is not str:
warn(WSGIWarning("header items must be strings"), stacklevel=3)
if name.lower() == "status":
warn(
WSGIWarning(
"The status header is not supported due to "
"conflicts with the CGI spec."
),
stacklevel=3,
)
if exc_info is not None and not isinstance(exc_info, tuple):
warn(WSGIWarning("invalid value for exc_info"), stacklevel=3)
headers = Headers(headers)
self.check_headers(headers)
return status_code, headers
def check_headers(self, headers):
etag = headers.get("etag")
if etag is not None:
if etag.startswith(("W/", "w/")):
if etag.startswith("w/"):
warn(
HTTPWarning("weak etag indicator should be upcase."),
stacklevel=4,
)
etag = etag[2:]
if not (etag[:1] == etag[-1:] == '"'):
warn(HTTPWarning("unquoted etag emitted."), stacklevel=4)
location = headers.get("location")
if location is not None:
if not urlparse(location).netloc:
warn(
HTTPWarning("absolute URLs required for location header"),
stacklevel=4,
)
def check_iterator(self, app_iter):
if isinstance(app_iter, string_types):
warn(
"The application returned astring. The response will send one character"
" at a time to the client, which will kill performance. Return a list"
" or iterable instead.",
WSGIWarning,
stacklevel=3,
)
def __call__(self, *args, **kwargs):
if len(args) != 2:
warn("A WSGI app takes two arguments.", WSGIWarning, stacklevel=2)
if kwargs:
warn(
"A WSGI app does not take keyword arguments.", WSGIWarning, stacklevel=2
)
environ, start_response = args
self.check_environ(environ)
environ["wsgi.input"] = InputStream(environ["wsgi.input"])
environ["wsgi.errors"] = ErrorStream(environ["wsgi.errors"])
# Hook our own file wrapper in so that applications will always
# iterate to the end and we can check the content length.
environ["wsgi.file_wrapper"] = FileWrapper
headers_set = []
chunks = []
def checking_start_response(*args, **kwargs):
if len(args) not in (2, 3):
warn(
"Invalid number of arguments: %s, expected 2 or 3." % len(args),
WSGIWarning,
stacklevel=2,
)
if kwargs:
warn("'start_response' does not take keyword arguments.", WSGIWarning)
status, headers = args[:2]
if len(args) == 3:
exc_info = args[2]
else:
exc_info = None
headers_set[:] = self.check_start_response(status, headers, exc_info)
return GuardedWrite(start_response(status, headers, exc_info), chunks)
app_iter = self.app(environ, checking_start_response)
self.check_iterator(app_iter)
return GuardedIterator(app_iter, headers_set, chunks)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/wrappers/auth.py
|
from ..http import parse_authorization_header
from ..http import parse_www_authenticate_header
from ..utils import cached_property
class AuthorizationMixin(object):
"""Adds an :attr:`authorization` property that represents the parsed
value of the `Authorization` header as
:class:`~werkzeug.datastructures.Authorization` object.
"""
@cached_property
def authorization(self):
"""The `Authorization` object in parsed form."""
header = self.environ.get("HTTP_AUTHORIZATION")
return parse_authorization_header(header)
class WWWAuthenticateMixin(object):
"""Adds a :attr:`www_authenticate` property to a response object."""
@property
def www_authenticate(self):
"""The `WWW-Authenticate` header in a parsed form."""
def on_update(www_auth):
if not www_auth and "www-authenticate" in self.headers:
del self.headers["www-authenticate"]
elif www_auth:
self.headers["WWW-Authenticate"] = www_auth.to_header()
header = self.headers.get("www-authenticate")
return parse_www_authenticate_header(header, on_update)
| 0 |
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug
|
qxf2_public_repos/what-is-confusing-backend/venv/Lib/site-packages/werkzeug/wrappers/user_agent.py
|
from ..useragents import UserAgent
from ..utils import cached_property
class UserAgentMixin(object):
"""Adds a `user_agent` attribute to the request object which
contains the parsed user agent of the browser that triggered the
request as a :class:`~werkzeug.useragents.UserAgent` object.
"""
@cached_property
def user_agent(self):
"""The current user agent."""
return UserAgent(self.environ)
| 0 |
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