Github_Proxy自建加速站点

部署 gh-proxy 到 Cloudflare Pages 上

步骤：

• 在本地创建一个空文件夹，新建一个名为 _worker.js 的文件。

• 把 hunsh 的 gh-proxy 代码全部黏贴进这个 _worker.js 里并保存。

• 登录 Cloudflare 控制台，进入 Workers & Pages -> 点击 Create -> 选择 Pages -> 选择 Upload assets (上传资源)。

• 创建项目，直接把这个含有 _worker.js 的文件夹拖拽上传部署。

_worker.js：

'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 {ResponseInit} */
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
    }
}
 
export default {
    async fetch(request, env, ctx) {
        // 如果直接访问首页，本地直接返回成功提示，彻底断绝 522 路由回环死锁
        const urlObj = new URL(request.url)
        if (urlObj.pathname === '/' || urlObj.pathname === '') {
            return makeRes('🚀 Your Private GitHub Proxy on Pages is Running Successfully!', 200, { 'content-type': 'text/plain;charset=UTF-8' })
        }
        
        // 伪造一个传统的事件对象，无缝兼容下方的旧版 fetchHandler
        const fakeEvent = { request: request }
        return fetchHandler(fakeEvent).catch(err => makeRes('cfworker error:\n' + err.stack, 502))
    }
}
 
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)
 
    if (urlObj.pathname === '/' || urlObj.pathname === '') {
        return makeRes('🚀 Your Private GitHub Proxy on Cloudflare Pages is Running Successfully!\n\nPlease append GitHub URL to use.', 200, { 'content-type': 'text/plain;charset=UTF-8' })
    }
 
    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.slice(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) {
        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) {
        if (Config.jsdelivr) {
            const newUrl = path.replace(/(?<=com\/.+?\/.+?)\/(.+?\/)/, '@$1').replace(/^(?:https?:\/\/)?raw\.(?:githubusercontent|github)\.com/, 'https://cdn.jsdelivr.net/gh')
            return Response.redirect(newUrl, 302)
        }
        else {
            return httpHandler(req, path)
        }
    } 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.search(/^https?:\/\//) !== 0) {
        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,
    })
}