Mastodon Oauth

backend/app/api/mastodon.py

@@ -0,0 +1,33 @@
+## Copyright © 2026 Olaf Kolkman
+## SPDX-License-Identifier: GPL-3.0-or-later
+
+from urllib.parse import quote
+
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.responses import RedirectResponse
+from starlette.requests import Request
+
+from backend.app.api.dependencies import get_current_user
+from backend.app.services.mastodon_oauth import finish_authorization, start_authorization
+
+router = APIRouter()
+
+
+@router.get('/oauth/start')
+def oauth_start(instance: str = 'mastodon.social', user: dict = Depends(get_current_user)):
+    try:
+        authorization_url = start_authorization(user['id'], instance)
+    except Exception as error:
+        raise HTTPException(status_code=502, detail=f'Could not register with Mastodon: {error}') from error
+    return {'authorization_url': authorization_url}
+
+
+@router.get('/oauth/callback')
+def oauth_callback(request: Request, code: str | None = None, state: str | None = None, error: str | None = None):
+    if error or not code or not state:
+        return RedirectResponse(f'/profile?mastodon_error={quote(error or "Authorization was cancelled")}')
+    try:
+        finish_authorization(code, state)
+    except Exception as callback_error:
+        return RedirectResponse(f'/profile?mastodon_error={quote(str(callback_error))}')
+    return RedirectResponse('/profile?mastodon=connected')