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// 反代目标网站.
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const upstream = 'github.com';
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// 反代目标网站的移动版.
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const upstream_mobile = 'github.com';
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// 访问区域黑名单（按需设置）.
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const blocked_region = [''];
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// IP地址黑名单（按需设置）.
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const blocked_ip_address = ['0.0.0.0', '127.0.0.1'];
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// 路径替换.
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const replace_dict = {
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  '$upstream': '$custom_domain', // 将"$upstream"替换为"$custom_domain"
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  '//github.com': '' // 移除路径中的"//github.com"
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};
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addEventListener('fetch', event => {
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  event.respondWith(fetchAndApply(event.request));
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});
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async function fetchAndApply(request) {
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  const region = request.headers.get('cf-ipcountry').toUpperCase(); // 获取访问者所在的地区
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  const ip_address = request.headers.get('cf-connecting-ip'); // 获取访问者的IP地址
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  const user_agent = request.headers.get('user-agent'); // 获取访问者的User-Agent头部信息
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  let response = null;
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  let url = new URL(request.url);
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  let url_host = url.host;
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  if (url.protocol == 'http:') { // 如果请求协议是HTTP，则重定向到HTTPS
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  url.protocol = 'https:';
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  response = Response.redirect(url.href);
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  return response;
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  }
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  if (await device_status(user_agent)) { // 判断是否为移动设备
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  var upstream_domain = upstream;
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  } else {
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  var upstream_domain = upstream_mobile;
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  }
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  url.host = upstream_domain;
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  if (blocked_region.includes(region)) { // 检查访问区域是否在黑名单中
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  response = new Response('Access denied: WorkersProxy is not available in your region yet.', {
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    status: 403
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  });
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  } else if (blocked_ip_address.includes(ip_address)){ // 检查IP地址是否在黑名单中
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  response = new Response('Access denied: Your IP address is blocked by WorkersProxy.', {
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    status: 403
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  });
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  } else {
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  let method = request.method;
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  let request_headers = request.headers;
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  let new_request_headers = new Headers(request_headers);
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  new_request_headers.set('Host', upstream_domain); // 设置请求头的Host字段为反代目标网站的域名
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  new_request_headers.set('Referer', url.href); // 设置请求头的Referer字段为当前请求的URL
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  let original_response = await fetch(url.href, {
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    method: method,
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    headers: new_request_headers
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  });
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  let original_response_clone = original_response.clone();
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  let original_text = null;
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  let response_headers = original_response.headers;
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  let new_response_headers = new Headers(response_headers);
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  let status = original_response.status;
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  // 修改响应头的设置
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  new_response_headers.set('cache-control', 'public, max-age=14400');
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  new_response_headers.set('access-control-allow-origin', '*');
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  new_response_headers.set('access-control-allow-credentials', true);
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  new_response_headers.delete('content-security-policy');
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  new_response_headers.delete('content-security-policy-report-only');
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  new_response_headers.delete('clear-site-data');
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  const content_type = new_response_headers.get('content-type');
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  if (content_type && content_type.includes('text/html') && content_type.includes('UTF-8')) {
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    original_text = await replace_response_text(original_response_clone, upstream_domain, url_host); // 替换响应中的文本内容
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  } else {
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    original_text = original_response_clone.body;
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  }
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  response = new Response(original_text, {
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    status,
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    headers: new_response_headers
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  });
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  }
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  return response;
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}
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async function replace_response_text(response, upstream_domain, host_name) {
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  let text = await response.text();
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  for (let i in replace_dict) {
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  let j = replace_dict[i];
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  if (i == '$upstream') {
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    i = upstream_domain;
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  } else if (i == '$custom_domain') {
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    i = host_name;
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  }
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  if (j == '$upstream') {
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    j = upstream_domain;
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  } else if (j == '$custom_domain') {
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    j = host_name;
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  }
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  let re = new RegExp(i, 'g');
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  text = text.replace(re, j); // 使用正则表达式替换文本内容
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  }
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  return text;
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}
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async function device_status(user_agent_info) {
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  var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
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  var flag = true;
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  for (var v = 0; v < agents.length; v++) {
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  if (user_agent_info.indexOf(agents[v]) > 0) {
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    flag = false;
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    break;
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  }
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  }
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  return flag;
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}