fix: handle 404 errors from untrusted input

Author: onerandomusername

monty/exts/info/github/__init__.py

@@ -325,6 +325,12 @@ async def get_reply(
 
         for resource_data, (match, size) in zip(fut, resources.items(), strict=True):
             if isinstance(resource_data, BaseException):
+                if (
+                    isinstance(resource_data, githubkit.exception.RequestFailed)
+                    and resource_data.response.status_code == 404
+                ):
+                    log.info("GitHub resource %r not found (404).", match)
+                    continue
                 log.warning(
                     "GitHub resource fetch for %r resulted in an exception: %r",
                     match,
@@ -478,7 +484,13 @@ async def github_user(self, ctx: commands.Context, user: str) -> None:
             )
             return
         context = ghretos.User(login=user)
-        obj = await self.fetch_resource(context)
+        try:
+            obj = await self.fetch_resource(context)
+        except githubkit.exception.RequestFailed as e:
+            if e.response.status_code == 404:
+                msg = "GitHub user not found."
+                raise commands.UserInputError(msg) from e
+            raise
         components: list[disnake.ui.Container | disnake.ui.ActionRow] = []
         components.append(github_handlers.UserRenderer().render_ogp_cv2(obj, context=context))
         components.append(
@@ -505,7 +517,13 @@ async def github_repo(self, ctx: commands.Context, user_and_repo: str, repo: str
             raise commands.UserInputError(msg)
 
         context = ghretos.Repo(owner=user, name=repo)
-        obj = await self.fetch_resource(context)
+        try:
+            obj = await self.fetch_resource(context)
+        except githubkit.exception.RequestFailed as e:
+            if e.response.status_code == 404:
+                msg = "GitHub repository not found."
+                raise commands.UserInputError(msg) from e
+            raise
         components: list[disnake.ui.Container | disnake.ui.ActionRow] = []
         components.append(github_handlers.RepoRenderer().render_ogp_cv2(obj, context=context))
         components.append(