小鱼开发
88 lines
2.5 KiB
Python
88 lines
2.5 KiB
Python
"""
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依赖注入工具
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============
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"""
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from __future__ import annotations
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from fastapi import Depends, HTTPException, status
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.config import get_settings
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from app.core.security import verify_token
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from app.db.session import get_db as db_session
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from app.crud.user import user as user_crud
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from app.models.user import User
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settings = get_settings()
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security = HTTPBearer(auto_error=False)
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# 数据库依赖
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async def get_db() -> AsyncSession:
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"""获取数据库 Session"""
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async for session in db_session():
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yield session
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async def get_current_user(
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credentials: HTTPAuthorizationCredentials | None = Depends(security),
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db: AsyncSession = Depends(get_db),
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) -> User:
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"""
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获取当前登录用户
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从 Authorization Header 中提取 JWT Token 并验证。
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开发模式下认证失败时自动兜底，返回数据库中的第一个用户，方便流程测试。
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"""
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# 开发模式：尝试正常认证，失败则兜底
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user: User | None = None
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if credentials is not None:
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token = credentials.credentials
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payload = verify_token(token)
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if payload and payload.get("sub"):
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user_id = payload.get("sub")
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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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# 开发模式兜底：认证失败或用户不存在时，自动返回第一个用户
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if user is None and settings.DEBUG:
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result = await db.execute(select(User).limit(1))
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user = result.scalar_one_or_none()
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# 数据库为空时自动创建测试用户
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if user is None:
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user = await user_crud.get_or_create_by_mobile(
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db,
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mobile="13800138000",
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nickname="测试用户",
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)
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if user is None:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="缺少认证信息",
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headers={"WWW-Authenticate": "Bearer"},
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)
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return user
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async def get_current_user_optional(
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credentials: HTTPAuthorizationCredentials | None = Depends(security),
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db=Depends(get_db),
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) -> User | None:
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"""
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获取当前登录用户（可选，未登录返回 None）
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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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