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backend/app/dependencies/__init__.py
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backend/app/dependencies/__init__.py
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backend/app/dependencies/auth.py
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backend/app/dependencies/auth.py
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from fastapi import Depends, HTTPException, status, Request
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from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
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from sqlalchemy.orm import Session
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from app.core.database import get_db
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from app.core.security import verify_token
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from app.services.user_service import UserService
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from app.schemas.auth import UserResponse
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from app.models.user import User
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# Bearer token 认证方案
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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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"""获取当前认证用户"""
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail={
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"code": "INVALID_AUTHENTICATION",
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"message": "无法验证凭据"
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},
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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# 验证令牌
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payload = verify_token(credentials.credentials, "access")
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if payload is None:
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raise credentials_exception
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# 获取用户ID
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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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user_id = int(user_id)
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except (ValueError, TypeError):
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raise credentials_exception
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# 获取用户信息
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user_service = UserService(db)
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user = user_service.get_user_by_id(user_id)
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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_user_from_headers(
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request: Request,
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db: Session = Depends(get_db)
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) -> User:
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"""从请求头中获取当前认证用户（支持userId和token）"""
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail={
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"code": "INVALID_AUTHENTICATION",
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"message": "无法验证凭据"
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},
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)
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try:
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# 尝试从多种方式获取token
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token = None
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user_id = None
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# 1. 从Authorization header获取
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authorization = request.headers.get("Authorization")
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if authorization and authorization.startswith("Bearer "):
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token = authorization.split(" ")[1]
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# 2. 从token header获取
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if not token:
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token = request.headers.get("token")
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# 3. 从userId header获取用户ID
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user_id_str = request.headers.get("userId")
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if user_id_str:
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try:
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user_id = int(user_id_str)
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except (ValueError, TypeError):
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pass
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# 如果没有token，认证失败
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if not token:
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raise credentials_exception
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# 验证令牌
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payload = verify_token(token, "access")
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if payload is None:
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raise credentials_exception
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# 获取token中的用户ID
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token_user_id: str = payload.get("sub")
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if token_user_id is None:
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raise credentials_exception
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token_user_id = int(token_user_id)
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# 如果header中有userId，验证两个ID是否一致
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if user_id is not None and user_id != token_user_id:
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raise credentials_exception
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# 使用token中的用户ID
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final_user_id = token_user_id
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except (ValueError, TypeError):
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raise credentials_exception
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# 获取用户信息
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user_service = UserService(db)
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user = user_service.get_user_by_id(final_user_id)
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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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"""获取当前活跃用户"""
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if not current_user.is_active:
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail={
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"code": "INACTIVE_USER",
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"message": "用户账户已被禁用"
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}
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)
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return current_user
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async def get_current_active_user_from_headers(
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current_user: User = Depends(get_current_user_from_headers)
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) -> User:
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"""从请求头获取当前活跃用户"""
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if not current_user.is_active:
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail={
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"code": "INACTIVE_USER",
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"message": "用户账户已被禁用"
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}
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)
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return current_user
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async def get_current_verified_user(
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current_user: User = Depends(get_current_active_user)
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) -> User:
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"""获取当前已验证用户"""
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if not current_user.is_verified:
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail={
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"code": "UNVERIFIED_USER",
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"message": "用户账户未验证"
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}
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)
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return current_user
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async def get_current_user_response(
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current_user: User = Depends(get_current_active_user),
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db: Session = Depends(get_db)
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) -> UserResponse:
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"""获取当前用户信息（响应格式）"""
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user_service = UserService(db)
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return user_service.to_user_response(current_user)
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async def get_current_user_response_from_headers(
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current_user: User = Depends(get_current_active_user_from_headers),
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db: Session = Depends(get_db)
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) -> UserResponse:
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"""从请求头获取当前用户信息（响应格式）"""
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user_service = UserService(db)
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return user_service.to_user_response(current_user)
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# 可选的认证依赖项（不强制要求认证）
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async def get_optional_current_user(
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credentials: HTTPAuthorizationCredentials = Depends(security),
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db: Session = Depends(get_db)
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) -> User | None:
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"""获取可选的当前用户（认证失败时不抛出异常）"""
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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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# 权限检查函数
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def check_user_permission(required_permission: str = None):
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"""检查用户权限的装饰器工厂"""
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async def permission_checker(
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current_user: User = Depends(get_current_active_user)
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) -> User:
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# 这里可以根据需要实现更复杂的权限检查逻辑
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# 目前只检查用户是否活跃
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if not current_user.is_active:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail={
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"code": "PERMISSION_DENIED",
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"message": "权限不足"
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}
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)
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return current_user
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return permission_checker
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# 管理员权限检查（预留）
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async def get_admin_user(
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current_user: User = Depends(get_current_active_user)
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) -> User:
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"""获取管理员用户（预留功能）"""
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# 这里可以添加管理员权限检查逻辑
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# 例如检查用户是否有管理员角色
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return current_user
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