请写一段程序实现基于Cloudflare Workers的VLESS代理服务器

以下是一个使用Cloudflare Workers实现基于VLESS的代理服务器的示例程序：

// 导入VLESS的加密算法库
import { parse } from 'https://cdn.jsdelivr.net/npm/v2ray-core/dist/encoding/protobuf/mod.ts';
import { aead_decrypt, aead_encrypt } from 'https://cdn.jsdelivr.net/npm/v2ray-core/dist/transport/internet/authenticators/aead/aead.ts';
import { VlessCipher } from 'https://cdn.jsdelivr.net/npm/v2ray-core/dist/transport/internet/kcp/encryption/vless.ts';

// 修改为您的VLESS服务器配置
const serverAddress = 'YOUR_SERVER_ADDRESS';
const serverPort = 12345;
const userId = 'YOUR_USER_ID';
const flow = 'xtls-rprx-direct';

// 修改为您的TLS证书
const tlsConfig = {
  key: `-----BEGIN PRIVATE KEY-----
  YOUR_PRIVATE_KEY
  -----END PRIVATE KEY-----`,
  cert: `-----BEGIN CERTIFICATE-----
  YOUR_CERTIFICATE
  -----END CERTIFICATE-----`,
};

addEventListener('fetch', (event) => {
  event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  const { host, pathname } = new URL(request.url);

  // 向VLESS服务器发送连接请求
  const conn = await Deno.connect({ hostname: serverAddress, port: serverPort });
  await conn.write(encodeVlessRequest(userId, flow, host, pathname));

  // 从VLESS服务器接收响应
  const response = await readVlessResponse(conn);

  // 构造响应对象
  const headers = new Headers();
  headers.set('Content-Type', 'application/octet-stream');
  headers.set('Content-Length', response.length);
  const body = new Uint8Array(response);

  return new Response(body, { status: 200, headers });
}

// 解析VLESS服务器响应
async function readVlessResponse(conn) {
  const buf = new Uint8Array(8192);
  let offset = 0;
  let responseLength = -1;

  while (true) {
    const n = await conn.read(buf.subarray(offset));
    if (n === null) {
      break;
    }
    offset += n;

    if (responseLength < 0 && offset >= 4) {
      responseLength = buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3];
    }

    if (offset >= responseLength) {
      break;
    }
  }

  // 解密VLESS服务器响应
  const response = aead_decrypt(buf.subarray(4, responseLength), new VlessCipher());
  return response;
}

// 构造VLESS连接请求
function encodeVlessRequest(id, flow, host, path) {
  const request = {
    version: 1,
    id: id,
    flow: flow,
    target: {
      network: 'tcp',
      address: host,
      port: 443,
    },
    header: {
      type: 'none',
    },
    tls: {
      allowInsecure: false,
      serverName: host,
    },
    request: {
      path: path,
      headers: {
        'Host': host,
      },
    },
  };

  const requestBytes = parse(request);
  const encryptedRequest = aead_encrypt(requestBytes, new VlessCipher());

  const requestLength = encryptedRequest.length;
  const buf = new Uint8Array(requestLength + 4);
  buf[0] = (requestLength >> 24) & 0xff;
  buf[1] = (requestLength >> 16) & 0xff;
  buf[2] = (requestLength >> 8) & 0xff;
  buf[3] = requestLength & 0xff;

  buf.set(encryptedRequest, 4);
  return buf;
}

您需要将YOUR_SERVER_ADDRESS替换为您的VLESS服务器地址，YOUR_USER_ID替换为您的用户ID，以及YOUR_PRIVATE_KEY和YOUR_CERTIFICATE替换为您的TLS证书的私钥和证书内容。

此程序会将用户的请求转发到VLESS服务器，并返回VLESS服务器的响应给用户。请确保您的VLESS服务器配置与此程序相匹配，并且Cloudflare Workers配置正确。请注意，此示例仅供参考，实际使用时可能需要根据您的具体需求进行适当修改