重构后端服务架构并优化前端错误处理

fastapi-backend/app/middleware/auth.py

@@ -0,0 +1,39 @@
+from fastapi import HTTPException, status, Depends
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.orm import Session
+from app.db.database import get_db
+from app.models.user import User
+from app.core.security import decode_access_token
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/auth/login")
+
+def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    payload = decode_access_token(token)
+    if payload is None:
+        raise credentials_exception
+    
+    uuid: str = payload.get("sub")
+    if uuid is None:
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.uuid == uuid).first()
+    if user is None:
+        raise credentials_exception
+    
+    return user
+
+def require_role(required_role: str):
+    def role_checker(current_user: User = Depends(get_current_user)):
+        if current_user.user_type != required_role:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="Insufficient permissions",
+            )
+        return current_user
+    return role_checker

fastapi-backend/app/middleware/error_handler.py

@@ -0,0 +1,25 @@
+from fastapi import HTTPException, Request
+from fastapi.responses import JSONResponse
+from app.utils.response import ErrorResponse
+
+async def error_handler(request: Request, exc: Exception):
+    # Handle HTTP exceptions
+    if isinstance(exc, HTTPException):
+        return JSONResponse(
+            status_code=exc.status_code,
+            content=ErrorResponse(
+                code=exc.status_code,
+                message=exc.detail,
+                data=None
+            ).dict()
+        )
+    
+    # Handle general exceptions
+    return JSONResponse(
+        status_code=500,
+        content=ErrorResponse(
+            code=500,
+            message="Internal Server Error",
+            data=str(exc)
+        ).dict()
+    )