利用CloudFlare Worker 免费部署 JSProxy 服务

JSProxy一个基于浏览器端JS实现的在线代理,这里不多介绍!

本文主要介绍一下利用CloudFlare Worker来搭建一个JSProxy服务。CloudFlare Worker是CloudFlare的边缘计算服务。开发者可通过JavaScript对CDN进行编程,从而能灵活处理HTTP请求。这使得很多任务可在CDN上完成,无需自己的服务器参与。CFW免费服务,支持每天10万次免费请求!基本也够用了!

项目介绍
项目地址:https://github.com/EtherDream/jsproxy

准备工作
Cloudflare账号一个

使用教程
1)打开https://workers.cloudflare.com,登陆上你的Cloudflare账号激活Workers服务

然后创建一个Workers【Create a Worker】


2)修改一下子域名,创建出来的域名格式:自定义的内容.Cloudflare用户名.workers.dev


3)复制https://raw.githubusercontent.com/EtherDream/jsproxy/master/cf-worker/index.js 的内容到左侧代码(Script)区域

文章最下方有代码备份!!

4)先点击【Run】右侧看执行效果,再点击【Save and deploy】部署代码
5)届时你可以访问你的站点https://jsproxy.5752.workers.dev查看效果,进入站点后将线路选择切换为当前站点即可使用

特别提示:浏览网站的时候,有时候会提示加载不安全脚本,点击允许即可!

代码备份

'use strict'

/**
* static files (404.html, sw.js, conf.js)
*/
const ASSET_URL = 'https://zjcqoo.github.io'

const JS_VER = 8
const MAX_RETRY = 1


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-allow-headers': '--raw-info,--level,--url,--referer,--cookie,--origin,--ext,--aceh,--ver,--type,--mode,accept,accept-charset,accept-encoding,accept-language,accept-datetime,authorization,cache-control,content-length,content-type,date,if-match,if-modified-since,if-none-match,if-range,if-unmodified-since,max-forwards,pragma,range,te,upgrade,upgrade-insecure-requests,x-requested-with,chrome-proxy,purpose',
'access-control-max-age': '1728000',
}),
}

/**
* @param {string} message
* @param {number} status
* @param {any} headers
*/
function makeRes(message, status = 200, headers = {}) {
headers['cache-control'] = 'no-cache'
headers['vary'] = '--url'
headers['access-control-allow-origin'] = '*'
return new Response(message, {status, headers})
}


addEventListener('fetch', e => {
const ret = fetchHandler(e)
.catch(err => makeRes('cfworker error:' + err, 502))
e.respondWith(ret)
})


function fetchHandler(e) {
const req = e.request
const urlStr = req.url
const urlObj = new URL(urlStr)

if (urlObj.protocol === 'http:') {
urlObj.protocol = 'https:'
return makeRes('', 301, {
'strict-transport-security': 'max-age=99999999; includeSubDomains; preload',
'location': urlObj.href,
})
}

switch (urlObj.pathname) {
case '/http':
return httpHandler(req)
case '/ws':
return makeRes('not support', 400)
case '/works':
return makeRes('it works')
default:
// static files
return fetch(ASSET_URL + urlObj.pathname)
}
}



/**
* @param {Request} req
*/
async function httpHandler(req) {
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 urlObj = null
let extHdrs = null
let acehOld = false
let rawSvr = ''
let rawLen = ''
let rawEtag = ''

const reqHdrNew = new Headers(reqHdrRaw)
reqHdrNew.set('x-jsproxy', '1')

for (const [k, v] of reqHdrRaw.entries()) {
if (!k.startsWith('--')) {
continue
}
reqHdrNew.delete(k)

const k2 = k.substr(2)
switch (k2) {
case 'url':
urlObj = new URL(v)
break
case 'aceh':
acehOld = true
break
case 'raw-info':
[rawSvr, rawLen, rawEtag] = v.split('|')
break
case 'level':
case 'mode':
case 'type':
break
case 'ext':
extHdrs = JSON.parse(v)
break
default:
if (v) {
reqHdrNew.set(k2, v)
} else {
reqHdrNew.delete(k2)
}
break
}
}
if (extHdrs) {
for (const [k, v] of Object.entries(extHdrs)) {
reqHdrNew.set(k, v)
}
}
if (!urlObj) {
return makeRes('missing url param', 403)
}

/** @type {RequestInit} */
const reqInit = {
method: req.method,
headers: reqHdrNew,
}
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 = '*'
let vary = '--url'

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 (k === 'vary') {
vary = vary + ',' + v
}
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('error', 400, {
'--error': 'bad len:' + newLen
})
}

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('vary', vary)
resHdrNew.set('--s', status)
resHdrNew.set('--ver', JS_VER)

resHdrNew.delete('content-security-policy')
resHdrNew.delete('content-security-policy-report-only')

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
}


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