check.py: apply the channel's status ytdlpCommand to yt-dlp probes; log open decision

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MUYdCh2nCVsQYgJAT7gwSi

check.py

@@ -18,6 +18,8 @@ Checks per channel:
   - yt-dlp -J on each format.url that is not a direct media file
 """
 
+import os
+import shlex
 import sys
 import json
 import subprocess
@@ -178,6 +180,29 @@ def http_ok(url: str, headers: dict | None = None) -> tuple[bool, int]:
         return False, -3
 
 
+# Per-channel yt-dlp options taken from the channel's declared `ytdlpCommand`
+# (e.g. "yt-dlp --impersonate chrome-120"), which real clients apply. Probing
+# without them reports failures (TLS-fingerprint 403/502) no client sees.
+_CHANNEL_YTDLP_ARGS: dict[str, list[str]] = {}
+
+
+def register_ytdlp_command(channel_id: str, command: Optional[str]) -> None:
+    if not command:
+        return
+    try:
+        parts = shlex.split(command)
+    except ValueError:
+        return
+    if parts and os.path.basename(parts[0]) in ("yt-dlp", "yt_dlp"):
+        parts = parts[1:]
+    if parts:
+        _CHANNEL_YTDLP_ARGS[channel_id] = parts
+
+
+def ytdlp_args_for(channel_id: str) -> list[str]:
+    return list(_CHANNEL_YTDLP_ARGS.get(channel_id, []))
+
+
 def ytdlp_extract(url: str, extra_args: list[str] | None = None) -> tuple[Optional[dict], str]:
     """Run yt-dlp -j and return (parsed_info_or_None, stderr_text).
 
@@ -389,7 +414,7 @@ def check_video(video: dict, channel_id: str, results: Results, run_ytdlp: bool)
     ytdlp_url = vurl if vurl and "127.0.0.1" not in vurl and "localhost" not in vurl else ""
     if not formats and ytdlp_url and is_page_url(ytdlp_url):
         results.info(channel_id, f"{label}: yt-dlp extract {ytdlp_url}")
-        yt, stderr = ytdlp_extract(ytdlp_url)
+        yt, stderr = ytdlp_extract(ytdlp_url, extra_args=ytdlp_args_for(channel_id))
         if yt is None:
             if _is_cf_protected(ytdlp_url):
                 results.warn(
@@ -457,7 +482,7 @@ def check_video(video: dict, channel_id: str, results: Results, run_ytdlp: bool)
         for hk, hv in fheaders.items():
             extra_args += ["--add-header", f"{hk}:{hv}"]
         results.info(channel_id, f"{label} format[{j}]: yt-dlp extract {furl}")
-        yt, stderr = ytdlp_extract(furl, extra_args=extra_args)
+        yt, stderr = ytdlp_extract(furl, extra_args=ytdlp_args_for(channel_id) + extra_args)
         if yt is None:
             resolved = follow_proxy_redirect(furl)
             if _is_cf_protected(furl) or _is_cf_protected(resolved):
@@ -581,6 +606,9 @@ def main():
             print("ERROR: no channels in /api/status response")
             sys.exit(1)
 
+        for ch in channels:
+            register_ytdlp_command(ch["id"], ch.get("ytdlpCommand"))
+
         print(f"status OK — {len(channels)} channels")
 
     # --- per-channel checks ---