- Apple Music: sign MusicKit developer tokens (ES256 via node:crypto),
accept the Music User Token from the iOS app, and poll recently played.
Apple has no now-playing API or play timestamps, so a new top song is
shown as playing for its length; connecting records a baseline so an
old song isn't announced as current
- Last.fm web auth ("Sign in with Last.fm") instead of typing a
username; session key stored encrypted
- Spotify accounts rejected by the 5-user development cap are sent back
with error=spotify_limited instead of a 500, so apps can offer
Spotify via Last.fm
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8
Phones that read system media sessions report playback themselves:
- POST /me/devices issues a per-phone token that can only call
POST /devices/now-playing; revocable, hashed at rest, 10 per user
- Reports name the app ("via Spotify"); unknown apps use the OS label
- Push-reported playback expires after 9 minutes of silence, since
phones send a heartbeat every 4 minutes while playing
Users can pause sharing (PUT /me/sharing: 1h, 8h, indefinitely). While
paused, connections aren't polled, phone reports are dropped, nothing is
added to history, and the current track switches to "played … ago".
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8
A play is recorded when a new track starts (pausing and resuming doesn't
count; returning after 10+ minutes does). Profiles show the last 10,
excluding the track playing now; 50 are kept per user. Recent plays are
free on every plan; the paid flag is renamed to fullHistory.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8
- 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
chrisandClaude Opus 5.5