refactor get_user_by_name_if_editable

api/kiwi_vpn_api/db/user.py

@@ -203,6 +203,20 @@ class User(UserBase, table=True):
             ) for capability in capabilities
         ]
 
+    def can_edit(
+        self,
+        user: User,
+    ) -> bool:
+        """
+        Check if this user can edit another user.
+        """
+
+        return (
+            user.name == self.name
+            # admin can edit everything
+            or self.can(UserCapabilityType.admin)
+        )
+
     def owns(
         self,
         device: Device,

api/kiwi_vpn_api/routers/_common.py

@@ -105,27 +105,33 @@ async def get_current_user_if_admin(
 
 async def get_user_by_name(
     user_name: str,
+    current_config: Config | None = Depends(Config.load),
+) -> User | None:
+    """
+    Get a user by name.
+    """
+
+    # can't connect to an unconfigured database
+    if current_config is None:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST)
+
+    return User.get(user_name)
+
+
+async def get_user_by_name_if_editable(
+    user: User | None = Depends(get_user_by_name),
     current_user: User = Depends(get_current_user_if_exists),
 ) -> User:
     """
-    Get a user by name.
-
-    Works if a) the currently logged-in user is an admin,
-    or b) if it is the requested user.
+    Get a user by name if it can be edited by the current user.
     """
 
-    # check if current user is admin
-    if current_user.can(UserCapabilityType.admin):
-        # fail if requested user doesn't exist
-        if (user := User.get(user_name)) is None:
-            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
+    # fail if user doesn't exist
+    if user is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
 
-    # check if current user is requested user
-    elif current_user.name == user_name:
-        pass
-
-    # current user is neither admin nor the requested user
-    else:
+    # fail if user isn't editable by the current user
+    if not current_user.can_edit(user):
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN)
 
     return user