fix(bilibili): add /all/v2 search API check to doctor (#182)

Co-authored-by: Panniantong <panniantong@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

agent_reach/channels/bilibili.py

@@ -1,15 +1,46 @@
 # -*- coding: utf-8 -*-
-"""Bilibili — check if yt-dlp is available."""
+"""Bilibili — video via yt-dlp, search via /x/web-interface API."""
 
+import json
 import os
 import shutil
+import subprocess
+import urllib.request
 from .base import Channel
 
+_UA = "agent-reach/1.0"
+_TIMEOUT = 10
+_SEARCH_API = "https://api.bilibili.com/x/web-interface/search/all/v2?keyword=test&page=1"
+
+
+def _search_api_ok() -> bool:
+    """Return True if Bilibili search API responds with code 0."""
+    req = urllib.request.Request(_SEARCH_API, headers={"User-Agent": _UA})
+    try:
+        with urllib.request.urlopen(req, timeout=_TIMEOUT) as resp:
+            data = json.loads(resp.read())
+            return data.get("code") == 0
+    except Exception:
+        return False
+
+
+def _bilisearch_ok() -> bool:
+    """Return True if yt-dlp bilisearch works without 412."""
+    try:
+        result = subprocess.run(
+            ["yt-dlp", "--flat-playlist", "--no-download", "-j",
+             "bilisearch1:test"],
+            capture_output=True, text=True, timeout=_TIMEOUT,
+        )
+        return result.returncode == 0
+    except Exception:
+        return False
+
 
 class BilibiliChannel(Channel):
     name = "bilibili"
     description = "B站视频和字幕"
-    backends = ["yt-dlp"]
+    backends = ["yt-dlp", "B站搜索 API"]
     tier = 1
 
     def can_handle(self, url: str) -> bool:
@@ -20,7 +51,30 @@ class BilibiliChannel(Channel):
     def check(self, config=None):
         if not shutil.which("yt-dlp"):
             return "off", "yt-dlp 未安装。安装：pip install yt-dlp"
+
         proxy = (config.get("bilibili_proxy") if config else None) or os.environ.get("BILIBILI_PROXY")
+
+        # 检测搜索 API 连通性
+        api_ok = _search_api_ok()
+        # 检测 yt-dlp bilisearch 是否 412
+        ytdlp_search_ok = _bilisearch_ok()
+
+        parts = []
+
+        # 视频读取状态
         if proxy:
-            return "ok", "可提取视频信息和字幕（代理已配置）"
-        return "ok", "可提取视频信息和字幕（本地环境）。服务器可能需要代理"
+            parts.append("视频读取：yt-dlp（代理已配置）")
+        else:
+            parts.append("视频读取：yt-dlp（本地环境，服务器可能需要代理）")
+
+        # 搜索状态
+        if api_ok:
+            parts.append("搜索：B站 API 可用（/x/web-interface/search/all/v2）")
+        else:
+            parts.append("搜索：B站 API 不可达，搜索功能可能受限")
+
+        if not ytdlp_search_ok:
+            parts.append("提示：yt-dlp bilisearch 不可用（可能 HTTP 412 反爬），搜索将走 B站 API")
+
+        status = "ok" if api_ok else "warn"
+        return status, "。".join(parts)