84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
"""FastAPI 依赖注入"""
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from typing import Optional
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from fastapi import Depends, HTTPException, Request, status, WebSocket
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from fastapi.security import OAuth2PasswordBearer
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from sqlalchemy.orm import Session
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from jose import JWTError
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from .database import get_db, SessionLocal
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from .security import decode_access_token
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from .models import User
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from .permissions import get_user_permissions
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# auto_error=False: 允许 token 为空（后续从 cookie 读取）
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login", auto_error=False)
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def get_current_user(
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request: Request,
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token: Optional[str] = Depends(oauth2_scheme),
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db: Session = Depends(get_db),
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) -> User:
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credentials_exc = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="无效的认证凭据",
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headers={"WWW-Authenticate": "Bearer"},
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)
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# 优先从 Authorization Bearer header 读取，回退到 httpOnly cookie
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if not token:
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token = request.cookies.get("access_token")
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if not token:
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raise credentials_exc
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try:
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payload = decode_access_token(token)
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if payload is None:
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raise credentials_exc
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user_id_raw = payload.get("sub")
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if user_id_raw is None:
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raise credentials_exc
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user_id = int(user_id_raw)
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except JWTError:
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raise credentials_exc
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user = db.query(User).filter(User.id == int(user_id)).first()
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if user is None or not user.is_active:
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raise credentials_exc
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return user
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def require_permission(permission: str):
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"""权限检查依赖工厂。用法: Depends(require_permission('user:create'))"""
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def checker(current_user: User = Depends(get_current_user)) -> User:
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if not current_user.is_active:
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raise HTTPException(status_code=403, detail="账号已禁用")
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perms = get_user_permissions(current_user)
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if permission not in perms:
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raise HTTPException(status_code=403, detail=f"无权限: {permission}")
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return current_user
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return checker
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def authenticate_websocket(websocket: WebSocket) -> Optional[User]:
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"""WebSocket 认证：从 cookie 或 query param token 中验证用户身份。
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Returns:
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User 如果认证成功，None 如果失败。
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"""
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token = websocket.cookies.get("access_token") or websocket.query_params.get("token")
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if not token:
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return None
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payload = decode_access_token(token)
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if not payload or not payload.get("sub"):
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return None
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db = SessionLocal()
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try:
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user = db.query(User).filter(User.id == int(payload["sub"])).first()
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if user and user.is_active:
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return user
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return None
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finally:
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db.close()
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