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const CONFIG = {
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  sourceDomain: 'domain.com',
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  ipv4TargetDomain: 'stun.domain.com', // IPv4 STUN穿透域名
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  ipv6TargetDomain: 'v6.domain.com',   // IPv6固定端口域名
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  ipv4Port: '#{port}',                  // IPv4动态端口（占位符）
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  ipv6Port: '4443'                       // IPv6固定端口
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};
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addEventListener('fetch', event => {
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  event.respondWith(handleRequest(event.request));
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});
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async function handleRequest(request) {
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  const url = new URL(request.url);
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  const hostname = url.hostname;
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  // 仅处理匹配源域名的请求
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  if (!hostname.includes(CONFIG.sourceDomain)) {
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    return new Response('Not Found', { status: 404 });
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  }
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  // 获取客户端真实IP（Cloudflare提供）
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  const clientIP = request.headers.get('CF-Connecting-IP');
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  const isIPv6 = clientIP && clientIP.includes(':'); // IPv6地址包含冒号
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  let targetDomain, targetPort;
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  if (isIPv6) {
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    // IPv6客户端 -> 使用IPv6固定端口
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    targetDomain = CONFIG.ipv6TargetDomain;
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    targetPort = CONFIG.ipv6Port;
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  } else {
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    // IPv4客户端 -> 使用STUN穿透域名和动态端口
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    targetDomain = CONFIG.ipv4TargetDomain;
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    targetPort = CONFIG.ipv4Port;
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  }
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  // 构建新URL：将源域名替换为目标域名，并添加对应端口
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  const newHost = hostname.replace(CONFIG.sourceDomain, targetDomain);
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  const targetUrl = `https://${newHost}:${targetPort}${url.pathname}${url.search}`;
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  // 返回302重定向
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  return Response.redirect(targetUrl, 302);
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}

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const IPV6_PORT_MAP = {
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  'alist': '5425',
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  'ql': '5700',
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  'migu': '13000'
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  // 可继续添加更多映射
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};

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function getSubdomainPrefix(hostname, baseDomain) {
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  // 如果主机名就是基域名本身，则没有前缀
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  if (hostname === baseDomain) return '';
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  // 去掉基域名（包括前面的点）得到前缀部分
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  const prefix = hostname.replace('.' + baseDomain, '');
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  // 如果前缀包含多个点（如 a.b.domain.com），只取第一个子域
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  if (prefix.includes('.')) {
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    return prefix.split('.')[0];
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  }
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  return prefix;
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}

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function getIPv6PortByHostname(hostname) {
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  for (const [prefix, port] of Object.entries(IPV6_PORT_MAP)) {
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    if (hostname.includes(prefix + '.' + CONFIG.sourceDomain)) {
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      return port;
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    }
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  }
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  return CONFIG.ipv6Port; // 默认端口
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}

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if (isIPv6) {
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  targetDomain = CONFIG.ipv6TargetDomain;
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  targetPort = getIPv6PortByHostname(hostname);
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} else {
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  targetDomain = CONFIG.ipv4TargetDomain;
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  targetPort = CONFIG.ipv4Port;
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}