fix: switch youtube innertube to ANDROID client (WEB blocked)

YouTube's InnerTube /player endpoint now returns LOGIN_REQUIRED for the
WEB client. Switch to ANDROID client context which still returns full
videoDetails. Fixes missing duration in announcements and broken channel
resolution from video URLs.

Extract shared _innertube_player() helper to deduplicate payload
construction between _resolve_via_innertube and _fetch_duration.

plugins/youtube.py

@@ -24,7 +24,9 @@ _VIDEO_ID_RE = re.compile(r"(?:v=|youtu\.be/|/embed/|/shorts/)([A-Za-z0-9_-]{11}
 _YT_DOMAINS = {"youtube.com", "www.youtube.com", "m.youtube.com", "youtu.be"}
 _YT_FEED_URL = "https://www.youtube.com/feeds/videos.xml?channel_id={}"
 _YT_PLAYER_URL = "https://www.youtube.com/youtubei/v1/player"
-_YT_CLIENT_VERSION = "2.20250101.00.00"
+_ANDROID_VERSION = "19.29.37"
+_ANDROID_SDK = 33
+_ANDROID_UA = f"com.google.android.youtube/{_ANDROID_VERSION} (Linux; U; Android 13)"
 _ATOM_NS = "{http://www.w3.org/2005/Atom}"
 _YT_NS = "{http://www.youtube.com/xml/schemas/2015}"
 _MEDIA_NS = "{http://search.yahoo.com/mrss/}"
@@ -107,33 +109,41 @@ def _extract_video_id(url: str) -> str | None:
 
 # -- Blocking helpers (for executor) -----------------------------------------
 
-def _resolve_via_innertube(video_id: str) -> str | None:
+def _innertube_player(video_id: str) -> dict:
-    """Resolve video ID to channel ID via InnerTube player API. Blocking.
+    """Fetch videoDetails via InnerTube ANDROID client. Blocking.
 
-    Small JSON request/response -- much more resilient to transient proxy
+    Uses ANDROID client -- WEB client returns LOGIN_REQUIRED since ~2026-02.
-    issues than fetching the full 1MB watch page.
+    Returns videoDetails dict, or {} on failure.
     """
     payload = json.dumps({
         "context": {
             "client": {
-                "clientName": "WEB",
+                "clientName": "ANDROID",
-                "clientVersion": _YT_CLIENT_VERSION,
+                "clientVersion": _ANDROID_VERSION,
+                "androidSdkVersion": _ANDROID_SDK,
             },
         },
         "videoId": video_id,
     }).encode()
     req = urllib.request.Request(_YT_PLAYER_URL, data=payload, method="POST")
     req.add_header("Content-Type", "application/json")
+    req.add_header("User-Agent", _ANDROID_UA)
     try:
         resp = _urlopen(req, timeout=_FETCH_TIMEOUT)
         raw = resp.read()
         resp.close()
         data = json.loads(raw)
-        channel_id = (data.get("videoDetails") or {}).get("channelId", "")
+        return data.get("videoDetails") or {}
+    except Exception:
+        return {}
+
+
+def _resolve_via_innertube(video_id: str) -> str | None:
+    """Resolve video ID to channel ID via InnerTube player API. Blocking."""
+    details = _innertube_player(video_id)
+    channel_id = details.get("channelId", "")
     if channel_id and _CHANNEL_ID_RE.fullmatch(channel_id):
         return channel_id
-    except Exception:
-        pass
     return None
 
 
@@ -142,28 +152,14 @@ def _fetch_duration(video_id: str) -> int:
 
     Returns 0 on failure or for live content.
     """
-    payload = json.dumps({
+    details = _innertube_player(video_id)
-        "context": {
+    if not details:
-            "client": {
+        return 0
-                "clientName": "WEB",
-                "clientVersion": _YT_CLIENT_VERSION,
-            },
-        },
-        "videoId": video_id,
-    }).encode()
-    req = urllib.request.Request(_YT_PLAYER_URL, data=payload, method="POST")
-    req.add_header("Content-Type", "application/json")
-    try:
-        resp = _urlopen(req, timeout=_FETCH_TIMEOUT)
-        raw = resp.read()
-        resp.close()
-        data = json.loads(raw)
-        details = data.get("videoDetails") or {}
     if details.get("isLiveContent") and details.get("isLive"):
         return 0
-        secs = int(details.get("lengthSeconds", 0))
+    try:
-        return secs
+        return int(details.get("lengthSeconds", 0))
-    except Exception:
+    except (ValueError, TypeError):
         return 0