127 lines
4.1 KiB
Python
127 lines
4.1 KiB
Python
"""
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Authentication module for backend API.
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Handles JWT-based authentication, token generation, and user context.
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"""
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from datetime import datetime, timedelta, timezone
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from typing import Optional, Dict, Any, Tuple
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jose import JWTError, jwt
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import logging
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from modules.shared.configuration import APP_CONFIG
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# Get Config Data
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SECRET_KEY = APP_CONFIG.get("APP_JWT_SECRET_SECRET")
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ALGORITHM = APP_CONFIG.get("Auth_ALGORITHM")
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ACCESS_TOKEN_EXPIRE_MINUTES = int(APP_CONFIG.get("APP_TOKEN_EXPIRY"))
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# OAuth2 Setup
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oauth2Scheme = OAuth2PasswordBearer(tokenUrl="token")
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# Logger
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logger = logging.getLogger(__name__)
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def createAccessToken(data: dict, expiresDelta: Optional[timedelta] = None) -> str:
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"""
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Creates a JWT Access Token.
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Args:
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data: Data to encode (usually user ID or username)
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expiresDelta: Validity duration of the token (optional)
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Returns:
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JWT Token as string
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"""
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toEncode = data.copy()
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if expiresDelta:
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expire = datetime.now(timezone.utc) + expiresDelta
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else:
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expire = datetime.now(timezone.utc) + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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toEncode.update({"exp": expire})
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encodedJwt = jwt.encode(toEncode, SECRET_KEY, algorithm=ALGORITHM)
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return encodedJwt
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def _getCurrentUser(token: str = Depends(oauth2Scheme)) -> Dict[str, Any]:
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"""
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Extracts and validates the current user from the JWT token.
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Args:
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token: JWT Token from the Authorization header
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Returns:
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User data
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Raises:
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HTTPException: For invalid token or user
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"""
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credentialsException = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid authentication credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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# Decode token
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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# Extract username from token
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username: str = payload.get("sub")
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if username is None:
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raise credentialsException
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# Extract mandate ID and user ID from token
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_mandateId: str = payload.get("_mandateId")
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_userId: str = payload.get("_userId")
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if not _mandateId or not _userId:
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logger.error(f"Missing context in token: _mandateId={_mandateId}, _userId={_userId}")
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raise credentialsException
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except JWTError:
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logger.warning("Invalid JWT Token")
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raise credentialsException
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# Initialize Gateway Interface with context
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gateway = getRootInterface()
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# Retrieve user from database
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user = gateway.getUserByUsername(username)
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if user is None:
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logger.warning(f"User {username} not found")
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raise credentialsException
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if user.get("disabled", False):
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logger.warning(f"User {username} is disabled")
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raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="User is disabled")
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# Ensure the user has the correct context
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if str(user.get("_mandateId")) != str(_mandateId) or str(user.get("id")) != str(_userId):
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logger.error(f"User context mismatch: token(_mandateId={_mandateId}, _userId={_userId}) vs user(_mandateId={user.get('_mandateId')}, id={user.get('id')})")
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raise credentialsException
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# Add authentication authority to user data
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user["authenticationAuthority"] = user.get("authenticationAuthority", "local")
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return user
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def getCurrentActiveUser(currentUser: Dict[str, Any] = Depends(_getCurrentUser)) -> Dict[str, Any]:
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if currentUser.get("disabled", False):
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="User is disabled"
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)
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auth_authority = currentUser.get("authenticationAuthority", "local")
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if auth_authority not in ["local", "microsoft"]:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail=f"Invalid authentication authority: {auth_authority}"
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)
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return currentUser
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