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| #!/usr/bin/env node
/**
* MCP Server: CN Direct Search (免代理国内直连搜索引擎 MCP)
* 纯原生 Node.js 实现，零外部依赖，安全稳定。
*/
const https = require("https");
const http = require("http");
const readline = require("readline");
const { URL } = require("url");
function decodeHtml(html) {
if (!html) return "";
return html
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, '"')
.replace(/'/g, "'")
.replace(/'/g, "'")
.replace(/ /g, " ")
.replace(/ /g, " ")
.replace(/ /g, " ")
.replace(/·/g, "·")
.replace(/<[^>]+>/g, " ")
.replace(/\s+/g, " ")
.trim();
}
function fetchHttp(targetUrl, timeoutMs = 8000) {
return new Promise((resolve, reject) => {
const parsed = new URL(targetUrl);
const client = parsed.protocol === "http:" ? http : https;
const req = client.get(
targetUrl,
{
headers: {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/122.0.0.0 Safari/537.36",
"Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
Accept: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
},
timeout: timeoutMs,
},
(res) => {
if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
const nextUrl = new URL(res.headers.location, targetUrl).toString();
return fetchHttp(nextUrl, timeoutMs).then(resolve, reject);
}
let data = "";
res.on("data", (chunk) => (data += chunk));
res.on("end", () => resolve({ statusCode: res.statusCode, body: data }));
}
);
req.on("error", reject);
req.on("timeout", () => {
req.destroy();
reject(new Error(`Request timeout after ${timeoutMs}ms`));
});
});
}
// 必应中国解析
async function searchBing(query, count = 8) {
const url = `https://cn.bing.com/search?q=${encodeURIComponent(query)}&setlang=zh-Hans`;
const res = await fetchHttp(url);
const blocks = res.body.split(/<li class="b_algo"/);
const results = [];
for (let i = 1; i < blocks.length && results.length < count; i++) {
const b = blocks[i];
const h2Match = b.match(/<h2[^>]*><a[^>]+href="([^"]+)"[^>]*>([\s\S]*?)<\/a><\/h2>/);
if (!h2Match) continue;
const link = h2Match[1];
const title = decodeHtml(h2Match[2]);
const pMatch = b.match(/<p[^>]*>([\s\S]*?)<\/p>/);
const snippet = pMatch ? decodeHtml(pMatch[1]) : "";
if (title && link) {
results.push({ title, url: link, snippet, engine: "bing" });
}
}
return results;
}
// 百度搜索解析
async function searchBaidu(query, count = 8) {
const url = `https://www.baidu.com/s?wd=${encodeURIComponent(query)}&ie=utf-8`;
const res = await fetchHttp(url);
const blocks = res.body.split(/<div class="[a-z0-9-_ ]*c-container/);
const results = [];
for (let i = 1; i < blocks.length && results.length < count; i++) {
const b = blocks[i];
const h3Match = b.match(/<h3[^>]*>[\s\S]*?<a[^>]+href="([^"]+)"[^>]*>([\s\S]*?)<\/a>[\s\S]*?<\/h3>/);
if (!h3Match) continue;
const link = h3Match[1];
const title = decodeHtml(h3Match[2]);
let snippet = "";
const spanMatch = b.match(/<span class="[a-z0-9-_ ]*content-right_[\s\S]*?>([\s\S]*?)<\/span>/) ||
b.match(/<div class="[a-z0-9-_ ]*c-abstract[^"]*">([\s\S]*?)<\/div>/);
if (spanMatch) snippet = decodeHtml(spanMatch[1]);
if (title && link) {
results.push({ title, url: link, snippet, engine: "baidu" });
}
}
return results;
}
// 自动选优与回退
async function doSearch(query, count = 8, engine = "auto") {
if (engine === "bing") return await searchBing(query, count);
if (engine === "baidu") return await searchBaidu(query, count);
try {
const r = await searchBing(query, count);
if (r && r.length > 0) return r;
} catch (e) {}
try {
return await searchBaidu(query, count);
} catch (e) {
return [];
}
}
// 网页正文提取
async function fetchPage(url) {
const res = await fetchHttp(url, 10000);
const html = res.body;
const titleMatch = html.match(/<title[^>]*>([\s\S]*?)<\/title>/i);
const title = titleMatch ? decodeHtml(titleMatch[1]) : "";
const clean = html
.replace(/<script[\s\S]*?<\/script>/gi, "")
.replace(/<style[\s\S]*?<\/style>/gi, "")
.replace(/<nav[\s\S]*?<\/nav>/gi, "")
.replace(/<footer[\s\S]*?<\/footer>/gi, "");
return { title, url, content: decodeHtml(clean).slice(0, 10000) };
}
// MCP 标准工具清单
const TOOLS = [
{
name: "cn_web_search",
description: "国内免代理搜索引擎（必应中国+百度）。无需 API Key，免翻墙，响应极速。",
inputSchema: {
type: "object",
properties: {
query: { type: "string", description: "搜索关键词" },
count: { type: "number", description: "返回数量（默认 8 条）" },
engine: { type: "string", enum: ["auto", "bing", "baidu"], description: "指定引擎" }
},
required: ["query"]
}
},
{
name: "cn_fetch_url",
description: "抓取并解析网页纯文本正文内容。",
inputSchema: {
type: "object",
properties: {
url: { type: "string", description: "网页 URL" }
},
required: ["url"]
}
}
];
// MCP JSON-RPC 2.0 通信处理
const rl = readline.createInterface({ input: process.stdin, output: process.stdout, terminal: false });
function send(msg) { process.stdout.write(JSON.stringify(msg) + "\n"); }
rl.on("line", async (line) => {
if (!line.trim()) return;
let req;
try { req = JSON.parse(line); } catch (e) { return; }
const { id, method, params } = req;
if (method === "initialize") {
return send({
jsonrpc: "2.0",
id,
result: {
protocolVersion: "2024-11-05",
capabilities: { tools: {} },
serverInfo: { name: "mcp-cn-search", version: "1.0.0" }
}
});
}
if (method === "notifications/initialized" || method === "ping") {
if (id !== undefined) send({ jsonrpc: "2.0", id, result: {} });
return;
}
if (method === "tools/list") {
return send({ jsonrpc: "2.0", id, result: { tools: TOOLS } });
}
if (method === "tools/call") {
try {
if (params.name === "cn_web_search") {
const res = await doSearch(params.arguments?.query, params.arguments?.count || 8, params.arguments?.engine || "auto");
return send({ jsonrpc: "2.0", id, result: { content: [{ type: "text", text: JSON.stringify(res, null, 2) }] } });
}
if (params.name === "cn_fetch_url") {
const res = await fetchPage(params.arguments?.url);
return send({ jsonrpc: "2.0", id, result: { content: [{ type: "text", text: JSON.stringify(res, null, 2) }] } });
}
} catch (err) {
return send({ jsonrpc: "2.0", id, result: { isError: true, content: [{ type: "text", text: err.message }] } });
}
}
});
|