Add getArtists endpoint for ID3-based artist browsing

src/routes/subsonic.js

@@ -208,6 +208,49 @@ router.get('/getMusicDirectory.view', authenticateSubsonic, async (req, res) =>
   }
 });
 
+// Get artists (ID3 tags)
+router.get('/getArtists.view', authenticateSubsonic, async (req, res) => {
+  try {
+    const artists = await all(`
+      SELECT DISTINCT artist, COUNT(DISTINCT album) as album_count
+      FROM tracks
+      GROUP BY artist
+      ORDER BY artist
+    `);
+
+    // Group by first letter
+    const grouped = {};
+    artists.forEach(artist => {
+      const firstChar = (artist.artist || 'Unknown')[0].toUpperCase();
+      const letter = /[A-Z]/.test(firstChar) ? firstChar : '#';
+      if (!grouped[letter]) grouped[letter] = [];
+      
+      const artistId = crypto.createHash('md5').update(`artist-${artist.artist}`).digest('hex');
+      grouped[letter].push({ 
+        id: artistId, 
+        name: artist.artist, 
+        albumCount: artist.album_count 
+      });
+    });
+
+    let artistsXml = '<artists ignoredArticles="The El La Los Las Le Les">\n';
+    
+    Object.keys(grouped).sort().forEach(letter => {
+      artistsXml += `  <index name="${letter}">\n`;
+      grouped[letter].forEach(artist => {
+        artistsXml += `    <artist id="${artist.id}" name="${escapeXml(artist.name)}" albumCount="${artist.albumCount}"/>\n`;
+      });
+      artistsXml += `  </index>\n`;
+    });
+    
+    artistsXml += '</artists>';
+    
+    sendSubsonicResponse(res, artistsXml);
+  } catch (error) {
+    sendSubsonicError(res, 0, error.message);
+  }
+});
+
 // Get indexes (artists)
 router.get('/getIndexes.view', authenticateSubsonic, async (req, res) => {
   try {