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"""
Authentication and authorization utilities
"""
import jwt
import bcrypt
import json
import os
from datetime import datetime, timedelta
from typing import Optional, Dict, Any
from functools import wraps
# Import Flask components only when available
try:
from flask import request, jsonify, session, redirect, url_for
FLASK_AVAILABLE = True
except ImportError:
FLASK_AVAILABLE = False
request = None
jsonify = None
session = None
redirect = None
url_for = None
class AuthManager:
def __init__(self, secret_key: str = None):
self.secret_key = secret_key or os.environ.get('SECRET_KEY', 'dev-secret-key-change-in-production')
self.users_file = 'data/users.json'
self.active_sessions = {} # Track active sessions for security
self.session_file = 'data/active_sessions.json'
self.ensure_users_file()
def ensure_users_file(self):
"""Ensure users file exists"""
os.makedirs('data', exist_ok=True)
if not os.path.exists(self.users_file):
with open(self.users_file, 'w') as f:
json.dump({}, f)
def hash_password(self, password: str) -> str:
"""Hash password with bcrypt"""
return bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')
def verify_password(self, password: str, hashed: str) -> bool:
"""Verify password against hash"""
return bcrypt.checkpw(password.encode('utf-8'), hashed.encode('utf-8'))
def load_users(self) -> Dict[str, Any]:
"""Load users from file"""
try:
with open(self.users_file, 'r') as f:
return json.load(f)
except:
return {}
def save_users(self, users: Dict[str, Any]):
"""Save users to file"""
with open(self.users_file, 'w') as f:
json.dump(users, f, indent=2)
def create_user(self, username: str, email: str, password: str) -> Dict[str, Any]:
"""Create a new user"""
users = self.load_users()
if username in users:
return {'success': False, 'error': 'Username already exists'}
# Check if email already exists
for user_data in users.values():
if user_data.get('email') == email:
return {'success': False, 'error': 'Email already registered'}
# Create user
user_id = f"user_{len(users) + 1}"
users[username] = {
'user_id': user_id,
'email': email,
'password_hash': self.hash_password(password),
'created_at': datetime.now().isoformat(),
'is_active': True
}
self.save_users(users)
return {'success': True, 'user_id': user_id}
def authenticate_user(self, username: str, password: str) -> Dict[str, Any]:
"""Authenticate user credentials"""
users = self.load_users()
if username not in users:
return {'success': False, 'error': 'Invalid username or password'}
user = users[username]
if not self.verify_password(password, user['password_hash']):
return {'success': False, 'error': 'Invalid username or password'}
if not user.get('is_active', True):
return {'success': False, 'error': 'Account is disabled'}
# Generate JWT token with shorter expiration for security
token = jwt.encode({
'user_id': user['user_id'],
'username': username,
'exp': datetime.utcnow() + timedelta(hours=8) # 8 hours instead of 7 days
}, self.secret_key, algorithm='HS256')
# Track active session
self.add_active_session(user['user_id'], token)
return {
'success': True,
'token': token,
'user_id': user['user_id'],
'username': username
}
def verify_token(self, token: str) -> Optional[Dict[str, Any]]:
"""Verify JWT token and check active session"""
try:
payload = jwt.decode(token, self.secret_key, algorithms=['HS256'])
user_id = payload.get('user_id')
# Check if session is still active
if not self.is_session_active(user_id, token):
return None
# Update session activity
self.update_session_activity(user_id)
return payload
except jwt.ExpiredSignatureError:
return None
except jwt.InvalidTokenError:
return None
def get_current_user(self, request_obj) -> Optional[Dict[str, Any]]:
"""Get current user from request"""
if not FLASK_AVAILABLE or not request_obj:
return None
# Try Authorization header first
auth_header = request_obj.headers.get('Authorization')
if auth_header and auth_header.startswith('Bearer '):
token = auth_header.split(' ')[1]
return self.verify_token(token)
# Try session
if session:
token = session.get('auth_token')
if token:
return self.verify_token(token)
return None
def create_default_admin(self) -> Dict[str, Any]:
"""Create default admin user if it doesn't exist"""
users = self.load_users()
admin_username = "admin"
admin_user_id = "admin_user"
# Check if admin already exists (by username or user_id)
if admin_username in users:
return {'success': True, 'message': 'Admin user already exists'}
# Check if user_id already exists
for user_data in users.values():
if user_data.get('user_id') == admin_user_id:
return {'success': True, 'message': 'Admin user ID already exists'}
# Create admin user
users[admin_username] = {
'user_id': admin_user_id,
'email': 'admin@researchmate.local',
'password_hash': self.hash_password('admin123'), # Default password
'created_at': datetime.now().isoformat(),
'is_active': True,
'is_admin': True
}
self.save_users(users)
return {
'success': True,
'message': 'Default admin user created',
'username': admin_username,
'password': 'admin123',
'note': 'Please change the default password after first login'
}
def load_active_sessions(self) -> Dict[str, Any]:
"""Load active sessions from file"""
try:
if os.path.exists(self.session_file):
with open(self.session_file, 'r') as f:
return json.load(f)
except:
pass
return {}
def save_active_sessions(self, sessions: Dict[str, Any]):
"""Save active sessions to file"""
try:
with open(self.session_file, 'w') as f:
json.dump(sessions, f, indent=2)
except:
pass
def add_active_session(self, user_id: str, token: str):
"""Add an active session"""
sessions = self.load_active_sessions()
sessions[user_id] = {
'token': token,
'created_at': datetime.now().isoformat(),
'last_activity': datetime.now().isoformat()
}
self.save_active_sessions(sessions)
def remove_active_session(self, user_id: str):
"""Remove an active session"""
sessions = self.load_active_sessions()
if user_id in sessions:
del sessions[user_id]
self.save_active_sessions(sessions)
def is_session_active(self, user_id: str, token: str) -> bool:
"""Check if a session is active"""
sessions = self.load_active_sessions()
if user_id not in sessions:
return False
session = sessions[user_id]
if session.get('token') != token:
return False
# Check if session is expired (8 hours)
created_at = datetime.fromisoformat(session['created_at'])
if datetime.now() - created_at > timedelta(hours=8):
self.remove_active_session(user_id)
return False
return True
def logout_user(self, user_id: str):
"""Logout user and invalidate session"""
self.remove_active_session(user_id)
return {'success': True, 'message': 'Logged out successfully'}
def cleanup_expired_sessions(self):
"""Clean up expired sessions"""
sessions = self.load_active_sessions()
current_time = datetime.now()
expired_sessions = []
for user_id, session in sessions.items():
created_at = datetime.fromisoformat(session['created_at'])
if current_time - created_at > timedelta(hours=8):
expired_sessions.append(user_id)
for user_id in expired_sessions:
del sessions[user_id]
if expired_sessions:
self.save_active_sessions(sessions)
return len(expired_sessions)
def update_session_activity(self, user_id: str):
"""Update last activity time for a session"""
sessions = self.load_active_sessions()
if user_id in sessions:
sessions[user_id]['last_activity'] = datetime.now().isoformat()
self.save_active_sessions(sessions)
# Global auth manager
auth_manager = AuthManager()
def require_auth(f):
"""Decorator to require authentication"""
@wraps(f)
def decorated_function(*args, **kwargs):
if not FLASK_AVAILABLE:
return f(*args, **kwargs)
user = auth_manager.get_current_user(request)
if not user:
if request.is_json:
return jsonify({'success': False, 'error': 'Authentication required'}), 401
else:
return redirect(url_for('login'))
return f(*args, **kwargs)
return decorated_function
def get_current_user() -> Optional[Dict[str, Any]]:
"""Get current authenticated user"""
if not FLASK_AVAILABLE:
return None
return auth_manager.get_current_user(request) |