- Fastify API with cookie (web) and bearer (mobile) sessions, follows,
pinned friends, featured songs, account deletion, Redis-backed rate limits
- Providers: Spotify (OAuth), Last.fm, ListenBrainz, Plex (PIN flow and
server discovery), Jellyfin (token auth, revoked on disconnect)
- Worker polls on an adaptive schedule in a Redis sorted set, so polling
scales horizontally and API usage tracks whether anyone is watching
- Track resolver links songs across services via ISRC (Deezer, Spotify),
iTunes search and song.link
- Realtime updates over WebSocket fan out through Redis pub/sub
- User-supplied server URLs are restricted to public addresses, checked
both up front and at connect time to defeat DNS rebinding
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8
