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@type argd: dict
@type _amazon_secret_access_key: string
@type _timestamp: string
@return signed URL of the request (string)
""""""
# First define a few util functions
def get_AWS_signature(argd, _amazon_secret_access_key,
method=""GET"", request_host=""webservices.amazon.com"",
request_uri=""/onca/xml"",
_timestamp=None):
""""""
Returns the signature of an Amazon request, based on the
arguments of the request.
@param argd: dictionary of arguments defining the query
@param _amazon_secret_access_key: your Amazon secret key
@param method: method of the request POST or GET
@param request_host: host contacted for the query. To embed in the signature.
@param request_uri: uri contacted at 'request_host'. To embed in the signature.
@param _timestamp: for testing purpose only (default: current timestamp)
@type argd: dict
@type _amazon_secret_access_key: string
@type method: string
@type host_header: string
@type http_request_uri: string
@type _timestamp: string
@return signature of the request (string)
""""""
# Add timestamp
if not _timestamp:
argd[""Timestamp""] = time.strftime(""%Y-%m-%dT%H:%M:%SZ"",
time.gmtime())
else:
argd[""Timestamp""] = _timestamp
# Order parameter keys by byte value
parameter_keys = sorted(argd.keys())
# Encode arguments, according to RFC 3986. Make sure we
# generate a list which is ordered by byte value of the keys
arguments = [quote(str(key), safe=""~/"") + ""="" +
quote(str(argd[key]), safe=""~/"")
for key in parameter_keys]
# Join
parameters_string = ""&"".join(arguments)
# Prefix
parameters_string = method.upper() + ""\n"" + \
request_host.lower() + ""\n"" + \
(request_uri or ""/"") + ""\n"" + \
parameters_string
# Sign and return
return calculate_RFC2104_HMAC(parameters_string,
_amazon_secret_access_key)
def calculate_RFC2104_HMAC(data, _amazon_secret_access_key):
""""""
Computes a RFC 2104 compliant HMAC Signature and then Base64
encodes it.
Module hashlib must be installed if Python < 2.5
<http://pypi.python.org/pypi/hashlib/20081119>
@param data: data to sign
@param _amazon_secret_access_key: your Amazon secret key
@type data: string
@type _amazon_secret_access_key: string. Empty if hashlib module not installed
""""""
if not HASHLIB_IMPORTED:
current_app.logger.warning(
""Module hashlib not installed. Please install it.""
)
return """"
else:
if sys.version_info < (2, 5):
# compatibility mode for Python < 2.5 and hashlib
my_digest_algo = _MySHA256(sha256())
else:
my_digest_algo = sha256
return base64.encodestring(
hmac.new(
_amazon_secret_access_key,
data,
my_digest_algo).digest()).strip()
# End util functions
parsed_url = urlparse(base_url)
signature = get_AWS_signature(argd, _amazon_secret_access_key,
request_host=parsed_url[1],
request_uri=parsed_url[2],