112 lines
3.3 KiB
Python
112 lines
3.3 KiB
Python
from typing import Optional
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from fastapi import Depends, HTTPException, status
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from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
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from sqlalchemy.orm import Session
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from jose import JWTError, jwt
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from app.database import get_db
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from app.config import settings
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from app.models.user import User
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# Security scheme for JWT
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security = HTTPBearer()
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async def get_current_user(
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credentials: HTTPAuthorizationCredentials = Depends(security),
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db: Session = Depends(get_db)
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) -> User:
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"""
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Dependency to get the current authenticated user from JWT token.
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Raises HTTP 401 if token is invalid or user not found.
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"""
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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# Decode JWT token
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token = credentials.credentials
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payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
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user_id: str = payload.get("sub")
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if user_id is None:
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raise credentials_exception
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except JWTError:
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raise credentials_exception
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# Get user from database
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user = db.query(User).filter(User.id == user_id).first()
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if user is None:
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raise credentials_exception
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return user
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async def get_current_active_user(
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current_user: User = Depends(get_current_user)
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) -> User:
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"""
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Dependency to get the current active user.
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Can be extended to check if user is active/banned.
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"""
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# Add user.is_active check here if needed in the future
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return current_user
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async def get_current_admin_user(
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current_user: User = Depends(get_current_user)
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) -> User:
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"""
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Dependency to get the current admin user.
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Raises HTTP 403 if user is not an admin.
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"""
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if not current_user.is_admin:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Not enough permissions"
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)
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return current_user
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async def get_optional_current_user(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(HTTPBearer(auto_error=False)),
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db: Session = Depends(get_db)
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) -> Optional[User]:
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"""
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Dependency to optionally get the current user.
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Returns None if no token provided or token is invalid.
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Useful for endpoints that work for both authenticated and guest users.
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"""
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if credentials is None:
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return None
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try:
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token = credentials.credentials
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payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
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user_id: str = payload.get("sub")
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if user_id is None:
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return None
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user = db.query(User).filter(User.id == user_id).first()
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return user
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except JWTError:
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return None
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def get_user_from_token(token: str, db: Session) -> Optional[User]:
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"""
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Get user from JWT token string (for WebSocket authentication).
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Returns None if token is invalid.
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"""
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try:
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payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
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user_id: str = payload.get("sub")
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if user_id is None:
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return None
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user = db.query(User).filter(User.id == user_id).first()
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return user
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except JWTError:
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return None
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