关于反代的一些问题

因为反代的原因，你无法登录你的账号，只能以访客身份使用，同时诸如X、YouTube这些肯定是进不去的。毕竟只是代理Google。

同时因为Cloudflare服务器的原因，可能部分地区访问反代速度缓慢或者无法访问。只能算是一种参考方案。

最后谷歌搜索众所周知查找部分文献效率更高，希望大家搭建之后合法使用！

本贴只作为学习交流使用，我始终认为技术是否无害取决于它的使用者。一切法律后果构建者自负，与本人无关！

开始创建

你需要一个Cloudflare的账号，并且将需要作为代理谷歌的域名转到Cloudflare。不然无法自定义域名，只能使用赠送的 *.workers.dev 域名，但是国内大部分地区是被墙了的。

准备好了之后，找到Pages和Workers页面，创建一个Workers，代码如下：

// 反代目标网站
const upstream = 'ipv6.google.com.hk'
const upstream_v4 = 'www.google.com.hk'

// 访问区域黑名单（按需设置）.
const blocked_region = ['TK']

//资源重定向
const replace_dict = {
  $upstream: '$custom_domain',
  'www.google.com/': '你的域名/', //填入你的子域名，保留最后面的/
  'gstatic.com': 'gstatic.cn',
  'ajax.googleapis.com': 'ajax.lug.ustc.edu.cn',
  'fonts.googleapis.com': 'fonts.googleapis.cn',
  'themes.googleusercontent.com': 'google-themes.lug.ustc.edu.cn',
  'www.gravatar.com/avatar': 'dn-qiniu-avatar.qbox.me/avatar',
  'www.google.co.jp': '$custom_domain',
  'www.google.com.sg': '$custom_domain',
  'books.google.com.hk': '$custom_domain',
  'books.google.co.jp': '$custom_domain',
  'books.google.com.sg': '$custom_domain',
  'maps.google.com.hk': '$custom_domain',
  'maps.google.co.jp': '$custom_domain',
  'maps.google.com.sg': '$custom_domain',
  'maps.google.com': '$custom_domain',
  'books.google.com': '$custom_domain',
}

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

async function fetchAndApply(request) {
  const region = request.headers.get('cf-ipcountry').toUpperCase()
//   const ip_address = request.headers.get('cf-connecting-ip')
//   const user_agent = request.headers.get('user-agent')

  let response = null
  let url = new URL(request.url)
  let url_host = url.host

  if (url.protocol == 'http:') {
    url.protocol = 'https:'
    response = Response.redirect(url.href)
    return response
  }

  //检查是否为图片搜索
  var key = url.href
  var ikey1 = 'tbm=isch'
  var ikey2 = '/img'
  if ((key.search(ikey1) == -1) && (key.search(ikey2) == -1)) {
    var upstream_domain = upstream
  } else {
    var upstream_domain = upstream_v4
  }

  url.host = upstream_domain

  if (blocked_region.includes(region)) {
    response = new Response(
      'Access denied: WorkersProxy is not available in your region yet.',
      {
        status: 403,
      }
    )
  } else {
    let method = request.method
    let request_headers = request.headers
    let new_request_headers = new Headers(request_headers)

    new_request_headers.set('Host', upstream_domain)
    new_request_headers.set('Referer', url.href)

    let original_response = await fetch(url.href, {
      method: method,
      headers: new_request_headers,
    })

    let original_response_clone = original_response.clone()
    let original_text = null
    let response_headers = original_response.headers
    let new_response_headers = new Headers(response_headers)
    let status = original_response.status

    new_response_headers.set('cache-control', 'public, max-age=14400')
    new_response_headers.set('access-control-allow-origin', '*')
    new_response_headers.set('access-control-allow-credentials', true)
    new_response_headers.delete('content-security-policy')
    new_response_headers.delete('content-security-policy-report-only')
    new_response_headers.delete('clear-site-data')

    const content_type = new_response_headers.get('content-type')
    if (content_type.includes('text/html') && content_type.includes('UTF-8')) {
      // && content_type.includes('UTF-8')
      original_text = await replace_response_text(
        original_response_clone,
        upstream_domain,
        url_host
      )
    } else {
      original_text = original_response_clone.body
    }

    response = new Response(original_text, {
      status,
      headers: new_response_headers,
    })
  }
  return response
}

async function replace_response_text(response, upstream_domain, host_name) {
  let text = await response.text()

  var i, j
  for (i in replace_dict) {
    j = replace_dict[i]
    if (i == '$upstream') {
      i = upstream_domain
    } else if (i == '$custom_domain') {
      i = host_name
    }

    if (j == '$upstream') {
      j = upstream_domain
    } else if (j == '$custom_domain') {
      j = host_name
    }

    let re = new RegExp(i, 'g')
    text = text.replace(re, j)
  }

  return text
}