Probe Suno CDN WAV before enqueue

chatgpt-suno-tampermonkey.user.js

@@ -1,7 +1,7 @@
 // ==UserScript==
 // @name         ChatGPT to Suno Prompt Copier
 // @namespace    local.suno-helper
-// @version      0.7.5
+// @version      0.7.6
 // @description  Copy structured ChatGPT song prompt versions into Suno fields.
 // @author       local
 // @match        https://chatgpt.com/*
@@ -27,7 +27,7 @@
 (function () {
   "use strict";
 
-  const SCRIPT_VERSION = "0.7.5";
+  const SCRIPT_VERSION = "0.7.6";
   const STORAGE_KEY = "chatgptSunoPromptSlots";
   const SLOT_COUNT = 2;
   const isChatGPT = location.hostname.includes("chatgpt.com") || location.hostname.includes("chat.openai.com");
@@ -882,9 +882,32 @@
     return "";
   }
 
+  async function canReadUrl(url) {
+    if (!url) return false;
+    const page = typeof unsafeWindow !== "undefined" ? unsafeWindow : window;
+    const methods = [
+      { method: "HEAD" },
+      { method: "GET", headers: { range: "bytes=0-0" } },
+    ];
+    for (const options of methods) {
+      try {
+        const response = await page.fetch(url, {
+          credentials: "include",
+          cache: "no-store",
+          ...options,
+        });
+        if (response.ok) return true;
+      } catch (error) {
+        console.warn("[ChatGPT to Suno] URL probe failed", url, error);
+      }
+    }
+    return false;
+  }
+
   async function requestSunoWavUrl(track) {
     if (!track.id) return extractWavUrl(track.wavUrl);
     const base = `https://studio-api-prod.suno.com/api/gen/${encodeURIComponent(track.id)}`;
+    const cdnWavUrl = `https://cdn1.suno.ai/${encodeURIComponent(track.id)}.wav`;
     try {
       await callSunoJson(`${base}/convert_wav/`, { method: "POST" });
     } catch (error) {
@@ -896,13 +919,15 @@
         const data = await callSunoJson(`${base}/wav_file/`, { method: "GET" });
         const direct = extractWavUrl(data);
         if (direct) return direct;
+        if (await canReadUrl(cdnWavUrl)) return cdnWavUrl;
       } catch (error) {
         console.warn("[ChatGPT to Suno] wav_file failed", error);
+        if (await canReadUrl(cdnWavUrl)) return cdnWavUrl;
       }
       await new Promise((resolve) => setTimeout(resolve, 1500));
     }
 
-    return extractWavUrl(track.wavUrl);
+    return extractWavUrl(track.wavUrl) || ((await canReadUrl(cdnWavUrl)) ? cdnWavUrl : "");
   }
 
   function downloadTextFile(text, name) {