如何使用CFW访问谷歌等网站

'use strict'
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* /** * static files (404.html, sw.js, conf.js) */const ASSET_URL = 'https://etherdream.github.io/jsproxy'const JS_VER = 10const MAX_RETRY = 1/** @type {RequestInit} */const PREFLIGHT_INIT = {  status: 204,  headers: new Headers({    'access-control-allow-origin': '*',    'access-control-allow-methods': 'GET,POST,PUT,PATCH,TRACE,DELETE,HEAD,OPTIONS',    'access-control-max-age': '1728000',  }),}/** * @param {any} body * @param {number} status * @param {Object<string, string>} headers */function makeRes(body, status = 200, headers = {}) {  headers['--ver'] = JS_VER  headers['access-control-allow-origin'] = '*'  return new Response(body, {status, headers})}/** * @param {string} urlStr  */function newUrl(urlStr) {  try {    return new URL(urlStr)  } catch (err) {    return null  }}addEventListener('fetch', e => {  const ret = fetchHandler(e)    .catch(err => makeRes('cfworker error:\n' + err.stack, 502))  e.respondWith(ret)})/** * @param {FetchEvent} e  */async function fetchHandler(e) {  const req = e.request  const urlStr = req.url  const urlObj = new URL(urlStr)  const path = urlObj.href.substr(urlObj.origin.length)  if (urlObj.protocol === 'http:') {    urlObj.protocol = 'https:'    return makeRes('', 301, {      'strict-transport-security': 'max-age=99999999; includeSubDomains; preload',      'location': urlObj.href,    })  }  if (path.startsWith('/http/')) {    return httpHandler(req, path.substr(6))  }  switch (path) {  case '/http':    return makeRes('请更新 cfworker 到最新版本!')  case '/ws':    return makeRes('not support', 400)  case '/works':    return makeRes('it works')  default:    // static files    return fetch(ASSET_URL + path)  }}/** * @param {Request} req * @param {string} pathname */function httpHandler(req, pathname) {  const reqHdrRaw = req.headers  if (reqHdrRaw.has('x-jsproxy')) {    return Response.error()  }  // preflight  if (req.method === 'OPTIONS' &&      reqHdrRaw.has('access-control-request-headers')  ) {    return new Response(null, PREFLIGHT_INIT)  }  let acehOld = false  let rawSvr = ''  let rawLen = ''  let rawEtag = ''  const reqHdrNew = new Headers(reqHdrRaw)  reqHdrNew.set('x-jsproxy', '1')  // 此处逻辑和 http-dec-req-hdr.lua 大致相同  // https://github.com/EtherDream/jsproxy/blob/master/lua/http-dec-req-hdr.lua  const refer = reqHdrNew.get('referer')  const query = refer.substr(refer.indexOf('?') + 1)  if (!query) {    return makeRes('missing params', 403)  }  const param = new URLSearchParams(query)  for (const [k, v] of Object.entries(param)) {    if (k.substr(0, 2) === '--') {      // 系统信息      switch (k.substr(2)) {      case 'aceh':        acehOld = true        break      case 'raw-info':        [rawSvr, rawLen, rawEtag] = v.split('|')        break      }    } else {      // 还原 HTTP 请求头      if (v) {        reqHdrNew.set(k, v)      } else {        reqHdrNew.delete(k)      }    }  }  if (!param.has('referer')) {    reqHdrNew.delete('referer')  }  // cfworker 会把路径中的 `//` 合并成 `/`  const urlStr = pathname.replace(/^(https?):\/+/, '$1://')  const urlObj = newUrl(urlStr)  if (!urlObj) {    return makeRes('invalid proxy url: ' + urlStr, 403)  }  /** @type {RequestInit} */  const reqInit = {    method: req.method,    headers: reqHdrNew,    redirect: 'manual',  }  if (req.method === 'POST') {    reqInit.body = req.body  }  return proxy(urlObj, reqInit, acehOld, rawLen, 0)}/** *  * @param {URL} urlObj  * @param {RequestInit} reqInit  * @param {number} retryTimes  */async function proxy(urlObj, reqInit, acehOld, rawLen, retryTimes) {  const res = await fetch(urlObj.href, reqInit)  const resHdrOld = res.headers  const resHdrNew = new Headers(resHdrOld)  let expose = '*'    for (const [k, v] of resHdrOld.entries()) {    if (k === 'access-control-allow-origin' ||        k === 'access-control-expose-headers' ||        k === 'location' ||        k === 'set-cookie'    ) {      const x = '--' + k      resHdrNew.set(x, v)      if (acehOld) {        expose = expose + ',' + x      }      resHdrNew.delete(k)    }    else if (acehOld &&      k !== 'cache-control' &&      k !== 'content-language' &&      k !== 'content-type' &&      k !== 'expires' &&      k !== 'last-modified' &&      k !== 'pragma'    ) {      expose = expose + ',' + k    }  }  if (acehOld) {    expose = expose + ',--s'    resHdrNew.set('--t', '1')  }  // verify  if (rawLen) {    const newLen = resHdrOld.get('content-length') || ''    const badLen = (rawLen !== newLen)    if (badLen) {      if (retryTimes < MAX_RETRY) {        urlObj = await parseYtVideoRedir(urlObj, newLen, res)        if (urlObj) {          return proxy(urlObj, reqInit, acehOld, rawLen, retryTimes + 1)        }      }      return makeRes(res.body, 400, {        '--error': `bad len: ${newLen}, except: ${rawLen}`,        'access-control-expose-headers': '--error',      })    }    if (retryTimes > 1) {      resHdrNew.set('--retry', retryTimes)    }  }  let status = res.status  resHdrNew.set('access-control-expose-headers', expose)  resHdrNew.set('access-control-allow-origin', '*')  resHdrNew.set('--s', status)  resHdrNew.set('--ver', JS_VER)  resHdrNew.delete('content-security-policy')  resHdrNew.delete('content-security-policy-report-only')  resHdrNew.delete('clear-site-data')  if (status === 301 ||      status === 302 ||      status === 303 ||      status === 307 ||      status === 308  ) {    status = status + 10  }  return new Response(res.body, {    status,    headers: resHdrNew,  })}/** * @param {URL} urlObj  */function isYtUrl(urlObj) {  return (    urlObj.host.endsWith('.googlevideo.com') &&    urlObj.pathname.startsWith('/videoplayback')  )}/** * @param {URL} urlObj  * @param {number} newLen  * @param {Response} res  */async function parseYtVideoRedir(urlObj, newLen, res) {  if (newLen > 2000) {    return null  }  if (!isYtUrl(urlObj)) {    return null  }  try {    const data = await res.text()    urlObj = new URL(data)  } catch (err) {    return null  }  if (!isYtUrl(urlObj)) {    return null  }  return urlObj}
*/