初步增加 web 界面

web/backend/deps.py

@@ -0,0 +1,50 @@
+"""FastAPI 依赖注入"""
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.orm import Session
+from jose import JWTError
+
+from .database import get_db
+from .security import decode_access_token
+from .models import User
+from .permissions import get_role_permissions
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")
+
+
+def get_current_user(
+    token: str = Depends(oauth2_scheme),
+    db: Session = Depends(get_db),
+) -> User:
+    credentials_exc = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="无效的认证凭据",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = decode_access_token(token)
+        if payload is None:
+            raise credentials_exc
+        user_id: int = payload.get("sub")
+        if user_id is None:
+            raise credentials_exc
+    except JWTError:
+        raise credentials_exc
+
+    user = db.query(User).filter(User.id == int(user_id)).first()
+    if user is None or not user.is_active:
+        raise credentials_exc
+    return user
+
+
+def require_permission(permission: str):
+    """权限检查依赖工厂。用法: Depends(require_permission('user:create'))"""
+    def checker(current_user: User = Depends(get_current_user)) -> User:
+        if not current_user.is_active:
+            raise HTTPException(status_code=403, detail="账号已禁用")
+        perms = get_role_permissions(current_user.role)
+        if permission not in perms:
+            raise HTTPException(status_code=403, detail=f"无权限: {permission}")
+        return current_user
+    return checker