使用 Deno Deploy 反代任何网站

Deno Deploy可以和 cf workers 一样，实现反代任何网站的效果。
需求

github 账号

免费版限制
每天 100,000 次请求
每月 100 G 流量
每个请求的CPU时间（非挂钟时间）最多为10ms

使用方法

1. 打开 Deno Deploy
2. 点击 sigh up
3. 注册后点击New Project
4. 这里有三种部署方式：GitHub仓库、CLI和在线编辑。我们就使用在线编辑，点击“Play”进入编辑器
5. 输入代码，然后点击“Save and deploy”。保存之后编辑器会像CF Workers一样会实时预览

一些反代代码

1. github

   'use strict'
   
   /**
    * static files (404.html, sw.js, conf.js)
    */
   const ASSET_URL = 'https://hunshcn.github.io/gh-proxy/'
   // 前缀，如果自定义路由为example.com/gh/*，将PREFIX改为 '/gh/'，注意，少一个杠都会错！
   const PREFIX = '/'
   // 分支文件使用jsDelivr镜像的开关，0为关闭，默认关闭
   const Config = {
       jsdelivr: 0
   }
   
   const whiteList = [] // 白名单，路径里面有包含字符的才会通过，e.g. ['/username/']
   
   /** @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',
       }),
   }
   
   
   const exp1 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:releases|archive)\/.*$/i
   const exp2 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:blob|raw)\/.*$/i
   const exp3 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:info|git-).*$/i
   const exp4 = /^(?:https?:\/\/)?raw\.(?:githubusercontent|github)\.com\/.+?\/.+?\/.+?\/.+$/i
   const exp5 = /^(?:https?:\/\/)?gist\.(?:githubusercontent|github)\.com\/.+?\/.+?\/.+$/i
   const exp6 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/tags.*$/i
   
   /**
    * @param {any} body
    * @param {number} status
    * @param {Object<string, string>} headers
    */
   function makeRes(body, status = 200, headers = {}) {
       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)
   })
   
   
   function checkUrl(u) {
       for (let i of [exp1, exp2, exp3, exp4, exp5, exp6]) {
           if (u.search(i) === 0) {
               return true
           }
       }
       return false
   }
   
   /**
    * @param {FetchEvent} e
    */
   async function fetchHandler(e) {
       const req = e.request
       const urlStr = req.url
       const urlObj = new URL(urlStr)
       let path = urlObj.searchParams.get('q')
       if (path) {
           return Response.redirect('https://' + urlObj.host + PREFIX + path, 301)
       }
       // cfworker 会把路径中的 `//` 合并成 `/`
       path = urlObj.href.substr(urlObj.origin.length + PREFIX.length).replace(/^https?:\/+/, 'https://')
       if (path.search(exp1) === 0 || path.search(exp5) === 0 || path.search(exp6) === 0 || path.search(exp3) === 0 || path.search(exp4) === 0) {
           return httpHandler(req, path)
       } else if (path.search(exp2) === 0) {
           if (Config.jsdelivr) {
               const newUrl = path.replace('/blob/', '@').replace(/^(?:https?:\/\/)?github\.com/, 'https://cdn.jsdelivr.net/gh')
               return Response.redirect(newUrl, 302)
           } else {
               path = path.replace('/blob/', '/raw/')
               return httpHandler(req, path)
           }
       } else if (path.search(exp4) === 0) {
           const newUrl = path.replace(/(?<=com\/.+?\/.+?)\/(.+?\/)/, '@$1').replace(/^(?:https?:\/\/)?raw\.(?:githubusercontent|github)\.com/, 'https://cdn.jsdelivr.net/gh')
           return Response.redirect(newUrl, 302)
       } else {
           return fetch(ASSET_URL + path)
       }
   }
   
   
   /**
    * @param {Request} req
    * @param {string} pathname
    */
   function httpHandler(req, pathname) {
       const reqHdrRaw = req.headers
   
       // preflight
       if (req.method === 'OPTIONS' &&
           reqHdrRaw.has('access-control-request-headers')
       ) {
           return new Response(null, PREFLIGHT_INIT)
       }
   
       const reqHdrNew = new Headers(reqHdrRaw)
   
       let urlStr = pathname
       let flag = !Boolean(whiteList.length)
       for (let i of whiteList) {
           if (urlStr.includes(i)) {
               flag = true
               break
           }
       }
       if (!flag) {
           return new Response("blocked", {status: 403})
       }
       if (urlStr.startsWith('github')) {
           urlStr = 'https://' + urlStr
       }
       const urlObj = newUrl(urlStr)
   
       /** @type {RequestInit} */
       const reqInit = {
           method: req.method,
           headers: reqHdrNew,
           redirect: 'manual',
           body: req.body
       }
       return proxy(urlObj, reqInit)
   }
   
   
   /**
    *
    * @param {URL} urlObj
    * @param {RequestInit} reqInit
    */
   async function proxy(urlObj, reqInit) {
       const res = await fetch(urlObj.href, reqInit)
       const resHdrOld = res.headers
       const resHdrNew = new Headers(resHdrOld)
   
       const status = res.status
   
       if (resHdrNew.has('location')) {
           let _location = resHdrNew.get('location')
           if (checkUrl(_location))
               resHdrNew.set('location', PREFIX + _location)
           else {
               reqInit.redirect = 'follow'
               return proxy(newUrl(_location), reqInit)
           }
       }
       resHdrNew.set('access-control-expose-headers', '*')
       resHdrNew.set('access-control-allow-origin', '*')
   
       resHdrNew.delete('content-security-policy')
       resHdrNew.delete('content-security-policy-report-only')
       resHdrNew.delete('clear-site-data')
   
       return new Response(res.body, {
           status,
           headers: resHdrNew,
       })
   }

• ASSET_URL是静态资源的url（实际上就是现在显示出来的那个输入框单页面
• PREFIX是前缀，默认（根路径情况为”/“），如果自定义路由为example.com/gh/*，请将PREFIX改为 ‘/gh/‘，注意，少一个杠都会错！

2. Onedrive

'use strict'

/**
 * static files (404.html, sw.js, conf.js)
 */
const ASSET_URL = 'https://改成你的组织名称-my.sharepoint.com'

const JS_VER = 10
const 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
}