fix: 429 retry, safety counter, local file filter in Spotify pagination

backend/novasonic-server.js

@@ -94,33 +94,47 @@ async function fetchSpotifyToken() {
 
 async function _spApi(path, token) {
   const url = path.startsWith('http') ? path : `https://api.spotify.com/v1${path}`;
+  for (let attempt = 0; attempt < 4; attempt++) {
     const r = await fetch(url, {
       headers: { Authorization: `Bearer ${token}` },
       signal: AbortSignal.timeout(10000),
     });
+    if (r.status === 429) {
+      const wait = (parseInt(r.headers.get('Retry-After') || '5', 10) + 1) * 1000;
+      await new Promise(res => setTimeout(res, wait));
+      continue;
+    }
     if (!r.ok) throw new Error(`Spotify API Fehler ${r.status}: ${path}`);
     return r.json();
   }
+  throw new Error('Spotify API rate-limited — bitte kurz warten und erneut versuchen');
+}
 
 async function _spAllPlaylistTracks(id, token) {
   const tracks = [];
+  let skippedLocal = 0;
   let path = `/playlists/${id}/tracks?limit=100`;
-  while (path) {
+  let pages = 0;
+  while (path && pages++ < 100) {
     const page = await _spApi(path, token);
     for (const item of page.items || []) {
-      if (item.track?.name) tracks.push(item.track);
+      const t = item.track;
+      if (!t || !t.id) continue;
+      if (t.is_local) { skippedLocal++; continue; }
+      tracks.push(t);
     }
     path = page.next || null;
   }
-  return tracks;
+  return { tracks, skippedLocal };
 }
 
 async function _spAllAlbumTracks(id, token) {
   const tracks = [];
   let path = `/albums/${id}/tracks?limit=50`;
-  while (path) {
+  let pages = 0;
+  while (path && pages++ < 100) {
     const page = await _spApi(path, token);
-    tracks.push(...(page.items || []));
+    tracks.push(...(page.items || []).filter(t => t?.id));
     path = page.next || null;
   }
   return tracks;
@@ -232,13 +246,14 @@ app.post('/api/spotify/resolve', async (req, res) => {
       const pl = await _spApi(`/playlists/${id}?fields=name,description,owner,images`, token);
       const owner = pl.owner?.display_name || '';
       const artUrl = _spArtwork(pl);
-      const trackItems = await _spAllPlaylistTracks(id, token);
+      const { tracks: trackItems, skippedLocal } = await _spAllPlaylistTracks(id, token);
       return res.json({
         type: 'playlist',
         name: pl.name || '',
         artist: owner,
         artworkUrl: artUrl,
         description: pl.description || '',
+        skippedLocal,
         tracks: trackItems.map(t => _spTrackItem(t, null, null, null)),
       });
     }

src/spotify.js

@@ -51,6 +51,7 @@ export async function resolveSpotifyLink() {
     }
     const data = await res.json();
     window._spotifyResolved = data;
+    if (data.skippedLocal > 0) toast(`${data.skippedLocal} lokale Datei(en) übersprungen (kein Stream verfügbar)`);
     _renderSpotifyPreview(data);
   } catch(e) {
     inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">${esc(e.message)}</div>`;