示例代理脚本

#!/usr/bin/env node
 
/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
 
// 示例代理服务器监听 :::8877，只允许 HTTPS 连接到 example.com。
// 设置 `GEMINI_SANDBOX_PROXY_COMMAND=scripts/example-proxy.js` 来在沙箱中运行代理
// 在沙箱中通过 `curl https://example.com` 测试（在 shell 模式下或通过 shell 工具）
 
import http from 'http';
import net from 'net';
import { URL } from 'url';
import console from 'console';
 
const PROXY_PORT = 8877;
const ALLOWED_DOMAINS = ['example.com', 'googleapis.com'];
const ALLOWED_PORT = '443';
 
const server = http.createServer((req, res) => {
  // 拒绝所有非 CONNECT 的 HTTPS 请求
  console.log(
    `[PROXY] Denying non-CONNECT request for: ${req.method} ${req.url}`,
  );
  res.writeHead(405, { 'Content-Type': 'text/plain' });
  res.end('Method Not Allowed');
});
 
server.on('connect', (req, clientSocket, head) => {
  // req.url 对于 CONNECT 请求来说格式是 "hostname:port"
  const { port, hostname } = new URL(`http://${req.url}`);
 
  console.log(`[PROXY] Intercepted CONNECT request for: ${hostname}:${port}`);
 
  if (
    ALLOWED_DOMAINS.some(
      (domain) => hostname == domain || hostname.endsWith(`.${domain}`),
    ) &&
    port === ALLOWED_PORT
  ) {
    console.log(`[PROXY] Allowing connection to ${hostname}:${port}`);
 
    // 建立到原始目标的 TCP 连接
    const serverSocket = net.connect(port, hostname, () => {
      clientSocket.write('HTTP/1.1 200 Connection Established\r\n\r\n');
      // 通过在客户端和目标服务器之间传输数据来创建隧道
      serverSocket.write(head);
      serverSocket.pipe(clientSocket);
      clientSocket.pipe(serverSocket);
    });
 
    serverSocket.on('error', (err) => {
      console.error(`[PROXY] Error connecting to destination: ${err.message}`);
      clientSocket.end(`HTTP/1.1 502 Bad Gateway\r\n\r\n`);
    });
  } else {
    console.log(`[PROXY] Denying connection to ${hostname}:${port}`);
    clientSocket.end('HTTP/1.1 403 Forbidden\r\n\r\n');
  }
 
  clientSocket.on('error', (err) => {
    // 如果客户端断开连接可能会发生这种情况
    console.error(`[PROXY] Client socket error: ${err.message}`);
  });
});
 
server.listen(PROXY_PORT, () => {
  const address = server.address();
  console.log(`[PROXY] Proxy listening on ${address.address}:${address.port}`);
  console.log(
    `[PROXY] Allowing HTTPS connections to domains: ${ALLOWED_DOMAINS.join(', ')}`,
  );
});