oauth optimizing

backend/app/api/mastodon.py

@@ -2,6 +2,7 @@
 ## SPDX-License-Identifier: GPL-3.0-or-later
 
 from urllib.parse import quote
+from urllib.error import HTTPError
 
 from fastapi import APIRouter, Depends, HTTPException
 from fastapi.responses import RedirectResponse
@@ -17,6 +18,14 @@ router = APIRouter()
 def oauth_start(instance: str = 'mastodon.social', user: dict = Depends(get_current_user)):
     try:
         authorization_url = start_authorization(user['id'], instance)
+    except HTTPError as error:
+        retry_after = error.headers.get('Retry-After') if error.headers else None
+        headers = {'Retry-After': retry_after} if retry_after else None
+        raise HTTPException(
+            status_code=error.code,
+            detail=f'Mastodon returned HTTP {error.code} while registering LinkLog. Try again later.',
+            headers=headers,
+        ) from error
     except Exception as error:
         raise HTTPException(status_code=502, detail=f'Could not register with Mastodon: {error}') from error
     return {'authorization_url': authorization_url}