mirror of
https://github.com/handsomezhuzhu/QQuiz.git
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124 lines
3.1 KiB
Python
124 lines
3.1 KiB
Python
"""
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Authentication Service
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"""
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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.ext.asyncio import AsyncSession
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from sqlalchemy import select
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from typing import Optional
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from models import User
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from database import get_db
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from utils import decode_access_token
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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: AsyncSession = Depends(get_db)
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) -> User:
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"""
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Get current authenticated user from JWT token.
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"""
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token = credentials.credentials
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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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# Decode token
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payload = decode_access_token(token)
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if payload is None:
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raise credentials_exception
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user_id = payload.get("sub")
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if user_id is None:
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raise credentials_exception
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# Convert user_id to int if it's a string
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try:
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user_id = int(user_id)
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except (ValueError, TypeError):
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raise credentials_exception
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# Get user from database
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result = await db.execute(select(User).where(User.id == user_id))
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user = result.scalar_one_or_none()
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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_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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Get current user and verify admin permissions.
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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_user(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(security),
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db: AsyncSession = Depends(get_db)
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) -> Optional[User]:
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"""
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Get current user if token is provided, otherwise return None.
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Useful for endpoints that work for both authenticated and anonymous 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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return await get_current_user(credentials, db)
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except HTTPException:
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return None
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async def get_current_user_from_token(token: str, db: AsyncSession) -> User:
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"""
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Get current user from JWT token string (for SSE with query params).
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Args:
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token: JWT token string
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db: Database session
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Returns:
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User object
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Raises:
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Exception: If token is invalid or user not found
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"""
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# Decode token
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payload = decode_access_token(token)
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if payload is None:
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raise Exception("Invalid token")
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user_id = payload.get("sub")
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if user_id is None:
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raise Exception("Invalid token payload")
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# Convert user_id to int if it's a string
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try:
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user_id = int(user_id)
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except (ValueError, TypeError):
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raise Exception("Invalid user ID")
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# Get user from database
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result = await db.execute(select(User).where(User.id == user_id))
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user = result.scalar_one_or_none()
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if user is None:
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raise Exception("User not found")
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return user
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