feat: MakerWorld Debug-Screenshot + bessere Fehlerdiagnose bei fehlgeschlagenem Abruf

backend/src/tools/makerworld/routes.js

@@ -130,7 +130,16 @@ async function getNextDataFromPage(page) {
 }
 async function isCloudflareChallenge(page) {
   const title = await page.title().catch(() => '');
-  return /just a moment|checking your browser|attention required/i.test(title);
+  return /just a moment|checking your browser|attention required|einen moment|überprüfung|einen augenblick|verifizierung ihres browsers/i.test(title);
+}
+// Speichert einen Screenshot + die aktuelle URL/Titel zur Fehlerdiagnose
+async function saveDebugScreenshot(userId, page) {
+  const dir = `${PROFILE_BASE_DIR}/${userId}`;
+  fs.mkdirSync(dir, { recursive: true });
+  await page.screenshot({ path: `${dir}/last-failure.png`, fullPage: false });
+  fs.writeFileSync(`${dir}/last-failure.json`, JSON.stringify({
+    url: page.url(), title: await page.title().catch(() => '?'), at: new Date().toISOString(),
+  }));
 }
 function isLoginUrl(url) {
   return /bambulab\.com\/[^/]*\/?sign-in|makerworld\.com\/[a-z]{2}\/sign-in/i.test(url || '');
@@ -155,7 +164,8 @@ async function attemptLogin(userId, browser, page) {
   ]);
   const pwField = await findFirstSelector(page, ['input[type="password"]']);
   if (!emailField || !pwField) {
-    throw new Error('Login-Formular nicht gefunden (Selektoren evtl. veraltet)');
+    await saveDebugScreenshot(userId, page).catch(() => {});
+    throw new Error(`Login-Formular nicht gefunden (Selektoren evtl. veraltet) — Seite: "${await page.title().catch(()=>'?')}" (${page.url()})`);
   }
 
   await page.type(emailField, creds.username, { delay: 25 });
@@ -192,6 +202,7 @@ async function attemptLogin(userId, browser, page) {
     throw err;
   }
 
+  await saveDebugScreenshot(userId, page).catch(() => {});
   throw new Error('Login fehlgeschlagen (weder Daten noch Code-Feld erkannt) — evtl. falsche Zugangsdaten oder geändertes Seitenlayout');
 }
 
@@ -205,14 +216,17 @@ async function fetchStatsViaBrowserInner(userId, forceRefresh) {
   }
 
   let browser;
+  let page;
   try {
     browser = await launchBrowser(userId);
-    const page = await browser.newPage();
+    page = await browser.newPage();
     await page.setUserAgent(USER_AGENT);
     await page.setViewport({ width: 1366, height: 900 });
     await page.goto(DATA_URL, { waitUntil: 'networkidle2', timeout: 45000 });
 
-    for (let i = 0; i < 3 && await isCloudflareChallenge(page); i++) {
+    // Bis zu 20 Sekunden Zeit geben, falls Cloudflare eine automatische
+    // Managed-Challenge zeigt (löst sich bei echtem Chromium meist selbst)
+    for (let i = 0; i < 5 && await isCloudflareChallenge(page); i++) {
       await new Promise(r => setTimeout(r, 4000));
     }
 
@@ -223,7 +237,10 @@ async function fetchStatsViaBrowserInner(userId, forceRefresh) {
     }
 
     if (!parsed) {
-      throw new Error('__NEXT_DATA__ nicht gefunden (weder Daten noch erkennbare Login-/Challenge-Seite) — Seitenlayout evtl. geändert');
+      const debugTitle = await page.title().catch(() => '?');
+      const debugUrl = page.url();
+      await saveDebugScreenshot(userId, page).catch(() => {});
+      throw new Error(`__NEXT_DATA__ nicht gefunden — Seite: "${debugTitle}" (${debugUrl}). Debug-Screenshot verfügbar über GET /debug-screenshot`);
     }
 
     const data = mapStatisticalData(parsed);
@@ -325,15 +342,26 @@ router.get('/login-status', authenticate, (req, res) => {
   const userId = req.user.id;
   const cache = getCache(userId);
   const creds = getCredentials(userId);
+  const debugPath = `${PROFILE_BASE_DIR}/${userId}/last-failure.json`;
+  let debugInfo = null;
+  try { debugInfo = JSON.parse(fs.readFileSync(debugPath, 'utf8')); } catch {}
   res.json({
     configured: !!creds,
     username: creds?.username || null,
     lastFetchedAt: cache.fetchedAt || null,
     lastError: cache.error || null,
     needsCode: pendingLoginByUser.has(userId),
+    debugScreenshot: debugInfo,
   });
 });
 
+// Letzter Fehl-Screenshot (Diagnose) — nur der eigene
+router.get('/debug-screenshot', authenticate, (req, res) => {
+  const path = `${PROFILE_BASE_DIR}/${req.user.id}/last-failure.png`;
+  if (!fs.existsSync(path)) return res.status(404).json({ error: 'Kein Debug-Screenshot vorhanden' });
+  res.sendFile(path);
+});
+
 router.post('/credentials', authenticate, async (req, res) => {
   const { username, password } = req.body;
   if (!username || !password) return res.status(400).json({ error: 'Benutzername und Passwort erforderlich' });

frontend/src/tools/statistik.jsx

@@ -214,6 +214,9 @@ function MakerworldTab({ toast }) {
   const [savingCookie, setSavingCookie] = useState(false);
   const [showCookieFallback, setShowCookieFallback] = useState(false);
 
+  const [debugImgUrl, setDebugImgUrl] = useState(null);
+  const [loadingScreenshot, setLoadingScreenshot] = useState(false);
+
   const load = () => {
     setLoading(true);
     api('/tools/makerworld/stats').then(setState).catch(()=>{}).finally(()=>setLoading(false));
@@ -268,6 +271,20 @@ function MakerworldTab({ toast }) {
     } catch(e) { toast?.(e.message,'error'); }
   };
 
+  const viewDebugScreenshot = async () => {
+    setLoadingScreenshot(true);
+    try {
+      const token = localStorage.getItem('sk_token');
+      const res = await fetch('/api/tools/makerworld/debug-screenshot', {
+        headers: token ? { 'Authorization': 'Bearer '+token } : {},
+      });
+      if (!res.ok) { toast?.('Kein Debug-Screenshot vorhanden','error'); return; }
+      const blob = await res.blob();
+      setDebugImgUrl(URL.createObjectURL(blob));
+    } catch(e) { toast?.(e.message,'error'); }
+    finally { setLoadingScreenshot(false); }
+  };
+
   const submitCode = async () => {
     if (!codeInput.trim()) return;
     setSubmittingCode(true);
@@ -393,11 +410,20 @@ function MakerworldTab({ toast }) {
         </div>
       )}
 
-      {state?.error && d && (
+      {state?.error && (
         <div style={{...S.card,borderColor:'rgba(248,113,113,0.3)',background:'rgba(248,113,113,0.06)'}}>
-          <div style={{color:'#f87171',fontFamily:'monospace',fontSize:11}}>
-            ⚠ Letzter Abruf fehlgeschlagen ({state.error}) — zeige zuletzt bekannten Stand.
+          <div style={{color:'#f87171',fontFamily:'monospace',fontSize:11,marginBottom:8}}>
+            ⚠ {state.error}{d ? ' — zeige zuletzt bekannten Stand.' : ''}
           </div>
+          <button onClick={viewDebugScreenshot} disabled={loadingScreenshot}
+            style={{...S.btn('#888888'),opacity:loadingScreenshot?0.5:1}}>
+            {loadingScreenshot?'…':'🖼 Debug-Screenshot ansehen'}
+          </button>
+          {debugImgUrl && (
+            <div style={{marginTop:10}}>
+              <img src={debugImgUrl} alt="Debug-Screenshot" style={{width:'100%',borderRadius:8,border:'1px solid rgba(255,255,255,0.1)'}}/>
+            </div>
+          )}
         </div>
       )}