Fix download: proxy audio through server to bypass IP lock

mod.ts

@@ -261,25 +261,13 @@ async function handler(req: Request): Promise<Response> {
       const id = searchParams.get("id");
       const title = searchParams.get("title") || "audio";
       const artist = searchParams.get("artist") || "";
-      const redirect = searchParams.get("redirect") !== "0";
       if (!id) return error("Missing id");
 
-      // Get stream URL - try piped first, then invidious
+      // Get stream URL - try invidious first (better proxy support)
       let audioUrl = null;
       let contentType = "audio/mp4";
+      let instance = "";
       
-      const piped = await fetchFromPiped(id);
-      if (piped.success && piped.streamingUrls) {
-        const audio = piped.streamingUrls.find((s: any) => 
-          s.type?.includes("audio/mp4") && s.audioQuality === "AUDIO_QUALITY_MEDIUM"
-        ) || piped.streamingUrls.find((s: any) => s.type?.includes("audio"));
-        if (audio) {
-          audioUrl = audio.url;
-          contentType = audio.type?.split(";")[0] || "audio/mp4";
-        }
-      }
-      
-      if (!audioUrl) {
       const invidious = await fetchFromInvidious(id);
       if (invidious.success && invidious.streamingUrls) {
         const audio = invidious.streamingUrls.find((s: any) => 
@@ -287,6 +275,20 @@ async function handler(req: Request): Promise<Response> {
         ) || invidious.streamingUrls.find((s: any) => s.type?.includes("audio"));
         if (audio) {
           audioUrl = audio.url;
+          instance = invidious.instance || "";
+          contentType = audio.type?.split(";")[0] || "audio/mp4";
+        }
+      }
+      
+      if (!audioUrl) {
+        const piped = await fetchFromPiped(id);
+        if (piped.success && piped.streamingUrls) {
+          const audio = piped.streamingUrls.find((s: any) => 
+            s.type?.includes("audio/mp4") && s.audioQuality === "AUDIO_QUALITY_MEDIUM"
+          ) || piped.streamingUrls.find((s: any) => s.type?.includes("audio"));
+          if (audio) {
+            audioUrl = audio.url;
+            instance = piped.instance || "";
             contentType = audio.type?.split(";")[0] || "audio/mp4";
           }
         }
@@ -297,19 +299,31 @@ async function handler(req: Request): Promise<Response> {
       const ext = contentType.includes("webm") ? ".webm" : ".m4a";
       const filename = `${artist ? artist + " - " : ""}${title}`.replace(/[<>:"/\\|?*]/g, "").trim() + ext;
 
-      // Redirect to audio URL - browser will handle download
-      if (redirect) {
-        return new Response(null, {
-          status: 302,
+      // Proxy the download through our server
+      try {
+        const response = await fetch(audioUrl, {
           headers: {
-            "Location": audioUrl,
-            ...corsHeaders,
+            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
+            "Accept": "*/*",
+            "Referer": instance || "https://www.youtube.com/",
           },
         });
+
+        if (!response.ok) {
+          return json({ success: false, error: `Failed to fetch audio: ${response.status}` }, 502);
         }
 
-      // Return URL for client to handle
-      return json({ success: true, url: audioUrl, filename, contentType });
+        return new Response(response.body, {
+          headers: {
+            "Content-Type": contentType,
+            "Content-Disposition": `attachment; filename="${encodeURIComponent(filename)}"`,
+            "Access-Control-Allow-Origin": "*",
+            "Access-Control-Expose-Headers": "Content-Disposition",
+          },
+        });
+      } catch (err) {
+        return json({ success: false, error: "Download failed: " + String(err) }, 500);
+      }
     }
 
     // ============ LYRICS & INFO ============

ui.ts

@@ -327,25 +327,12 @@ function render(f,append){
   else el.innerHTML=html;
 }
 
-async function download(i){
+function download(i){
   var s=songs[i];if(!s||!s.videoId)return;
-  var btn=document.querySelectorAll('.dl-btn')[i];
-  if(btn){btn.textContent='...';btn.disabled=true;}
-  try{
-    var res=await fetch('/api/download?id='+s.videoId+'&redirect=0');
-    var data=await res.json();
-    if(!data.success||!data.url){alert('Download failed: '+(data.error||'No URL'));return;}
-    // Create download link
-    var a=document.createElement('a');
-    a.href=data.url;
-    a.download=data.filename||'audio.m4a';
-    a.target='_blank';
-    a.rel='noopener';
-    document.body.appendChild(a);
-    a.click();
-    document.body.removeChild(a);
-  }catch(e){alert('Download error');}
-  finally{if(btn){btn.textContent='↓';btn.disabled=false;}}
+  var title=encodeURIComponent(s.title||'audio');
+  var artist=encodeURIComponent(s.artists?.map(a=>a.name).join(', ')||'');
+  // Open download in new tab - server will proxy the audio
+  window.open('/api/download?id='+s.videoId+'&title='+title+'&artist='+artist,'_blank');
 }
 
 function play(i){