debug(sync): endpoint diag multi-endpoints (Data API + InnerTube) + bouton UI

server/index.mjs

@@ -108,7 +108,7 @@ import {
   fetchGoogleLiked, fetchTwitchProfile, fetchTwitchFollows, hasGoogleWriteScope,
   fetchGoogleWatchLater, pushGoogleWatchLater, fetchInnerTubeHistory,
   fetchInnerTubeWatchLaterViaLib, pushInnerTubeWatchLater, fetchGoogleWatchLaterId,
-  fetchAccountChannels,
+  fetchAccountChannels, diagnoseInnertube,
 } from './oauth.mjs';
 import { getSearchMode, getYtDlpBin, hasCookiesFile, metricsSnapshot } from './providers/youtube-common.mjs';
 import { ytScrapeCacheStats } from './providers/youtube.mjs';
@@ -585,6 +585,28 @@ r.get('/oauth/google/yt-channels', authMiddlewareCookieAware, oauthLimiter, asyn
   }
 });
 
+// Diagnostic : état de chaque endpoint InnerTube authentifié + Data API.
+r.get('/oauth/google/diag', authMiddlewareCookieAware, oauthLimiter, async (req, res) => {
+  try {
+    const conn = await freshOAuthToken(req.user.id, 'google');
+    const dataApi = {};
+    try {
+      await fetchGoogleWatchLaterId(conn.accessToken);
+      dataApi.watchLaterId = true;
+    } catch (e) {
+      dataApi.watchLaterId = false;
+      dataApi.watchLaterError = String(e?.message || '').slice(0, 80);
+    }
+    const innertube = await diagnoseInnertube(conn);
+    try {
+      console.log(`[oauth] diag user=${req.user?.id} ${JSON.stringify({ dataApi, innertube }).slice(0, 800)}`);
+    } catch {}
+    return res.json({ dataApi, innertube });
+  } catch (error) {
+    return res.status(error?.status || 502).json({ error: error?.message || 'diag_failed' });
+  }
+});
+
 r.put('/oauth/google/yt-channel', authMiddlewareCookieAware, oauthLimiter, (req, res) => {
   try {
     const channelId = String(req.body?.channelId || '').trim().slice(0, 64) || null;