第一次提交

app/deps.py

@@ -0,0 +1,29 @@
+"""FastAPI 依赖：数据库 session、当前登录用户。"""
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.db import get_db
+from app.models.user import User
+from app.services.security import decode_access_token
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")
+
+_CRED_EXC = HTTPException(
+    status_code=status.HTTP_401_UNAUTHORIZED,
+    detail="无效或过期的凭证",
+    headers={"WWW-Authenticate": "Bearer"},
+)
+
+
+async def get_current_user(
+    token: str = Depends(oauth2_scheme),
+    db: AsyncSession = Depends(get_db),
+) -> User:
+    user_id = decode_access_token(token)
+    if not user_id:
+        raise _CRED_EXC
+    user = await db.get(User, user_id)
+    if user is None or not user.is_active:
+        raise _CRED_EXC
+    return user