# 【复刻】GitHub 文件加速

Last updated on March 19, 2024 pm

## 项目介绍

file-proxy 基于 gh-proxy 修改，理论上支持任意http协议的链接加速，支持下载文件、支持 git bash 终端直接 git clone 项目。

## 创建 Worker

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    'use strict'

    /**
     * static files (404.html, sw.js, conf.js)
     */
    const ASSET_URL = 'https://xxx.limour.top/'
    // 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 = '/token/'
    // git使用cnpmjs镜像、分支文件使用jsDelivr镜像的开关，0为关闭，默认关闭
    // 此处不要开启，否则将导致下载问题
    const Config = {
        jsdelivr: 0,
        cnpmjs: 0
    }

    /** @type {RequestInit} */
    const PREFLIGHT_INIT = {
        status: 204,
        headers: new Headers({
            'access-control-allow-origin': '*',
            'access-control-allow-credentials': true,
            '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['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) {
        console.log("new request enter")
        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 `/`
        let path = urlObj.href.substr(urlObj.origin.length + PREFIX.length)
        if (path.startsWith('https')){
            path = path.replace(/^https?:\/+/, 'https://')
        }else{
            path = path.replace(/^http?:\/+/, 'http://')
        }
        const exp1 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:releases|archive)\/.*$/i
        const exp2 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:blob)\/.*$/i
        const exp3 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:info|git-).*$/i
        const exp4 = /^(?:https?:\/\/)?raw\.githubusercontent\.com\/.+?\/.+?\/.+?\/.+$/i

        if (path.search(exp1) === 0 || !Config.cnpmjs && (path.search(exp3) === 0 || path.search(exp4) === 0)) {
            return httpHandler(req, urlObj, 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, urlObj, path)
            }
        } else if (path.search(exp3) === 0) {
            const newUrl = path.replace(/^(?:https?:\/\/)?github\.com/, 'https://github.com.cnpmjs.org')
            return Response.redirect(newUrl, 302)
        } else if (path.search(exp4) === 0) {
            const newUrl = path.replace(/(?<=com\/.+?\/.+?)\/(.+?\/)/, '@$1').replace(/^(?:https?:\/\/)?raw\.githubusercontent\.com/, 'https://cdn.jsdelivr.net/gh')
            return Response.redirect(newUrl, 302)
        } else {
            if (path === '' || path === '/') {
                return new Response("success", {status: 200})
            }
            return httpHandler(req, urlObj, path)
        }
    }

    /**
     * @param {Request} req
     * @param {string} pathname
     */
    function httpHandler(req, reqUrlObj, pathname) {
        console.log("http handler")
        const reqHdrRaw = req.headers

        PREFLIGHT_INIT.headers.set("access-control-allow-origin", reqUrlObj.origin)
        // preflight
        if (req.method === 'OPTIONS' &&
            reqHdrRaw.has('access-control-request-headers')
        ) {
            return new Response(null, PREFLIGHT_INIT)
        }

        let rawLen = ''

        const reqHdrNew = new Headers(reqHdrRaw)

        const fullReqUrl = reqUrlObj.origin + PREFIX
        if (reqHdrNew.get('Referer') && reqHdrNew.get('Referer').indexOf(fullReqUrl) == 0){
            reqHdrNew.set('Referer', reqHdrNew.get('Referer').substr(fullReqUrl.length))
        }

        let urlStr = pathname
        if (urlStr.startsWith('github')) {
            urlStr = 'https://' + urlStr
        }
        // const urlObj = newUrl('http://online.dun.ornglad.com/download/QQ%E9%82%AE%E7%AE%B1_010273872.exe')
        const urlObj = newUrl(urlStr)
        /** @type {RequestInit} */
        const reqInit = {
            method: req.method,
            headers: reqHdrNew,
            redirect: 'manual',
            body: req.body
        }
        return proxy(req, reqUrlObj, urlObj, reqInit, rawLen, 0)
    }

    /**
     *
     * @param {URL} urlObj
     * @param {RequestInit} reqInit
     */
    async function proxy(cfReq, cfReqUrlObj, urlObj, reqInit, rawLen) {
        console.log(urlObj)
        const res = await fetch(urlObj.href, reqInit)
        const resHdrOld = res.headers
        const resHdrNew = new Headers(resHdrOld)

        // verify
        if (rawLen) {
            const newLen = resHdrOld.get('content-length') || ''
            const badLen = (rawLen !== newLen)

            if (badLen) {
                return makeRes(res.body, 400, {
                    '--error': `bad len: ${newLen}, except: ${rawLen}`,
                    'access-control-expose-headers': '--error',
                })
            }
        }
        var status = res.status
        if (status == 301 || status == 302 || status == 303 || status == 307 || status == 308) {
            var nextLocation = resHdrOld.get('location')
            if ( ! nextLocation.startsWith('https') && ! nextLocation.startsWith('http')){
                if (nextLocation.startsWith('//') && ! nextLocation.startsWith('///')){
                    nextLocation = PREFIX + urlObj.protocol + nextLocation
                } else if (urlObj.origin.endsWith('/') || nextLocation.startsWith('/')){
                    nextLocation = PREFIX + urlObj.origin + nextLocation
                } else {
                    nextLocation = PREFIX + urlObj.origin + '/' + nextLocation
                }
            } else {
                nextLocation = PREFIX + nextLocation
            }
            status = 302
            resHdrNew.set('location', nextLocation)
        }
        if (cfReq.headers.has('origin')){
            resHdrNew.set('access-control-allow-origin', cfReq.headers.get('origin'))
        } else if(cfReq.headers.has('Referer') && newUrl(cfReq.headers.get('Referer'))){
            resHdrNew.set('access-control-allow-origin', newUrl(cfReq.headers.get('Referer')).origin)
        } else {
            resHdrNew.set('access-control-allow-origin', cfReqUrlObj.origin)
        }
        resHdrNew.set('access-control-expose-headers', '*')
        resHdrNew.set('access-control-allow-methods', 'GET,POST,PUT,PATCH,TRACE,DELETE,HEAD,OPTIONS')
        resHdrNew.set('access-control-allow-credentials', true)

        resHdrNew.delete('content-security-policy')
        resHdrNew.delete('content-security-policy-report-only')
        resHdrNew.delete('clear-site-data')
        resHdrNew.delete('cross-origin-resource-policy')
        return new Response(res.body, {
            status,
            headers: resHdrNew,
        })
    }

## 添加路由

## 设置 WAF 白名单

## 使用方法

- 私有仓库：`git clone https://user:TOKEN@xxx.limour.top/token/https://github.com/hunshcn/gh-proxy.git`

#CloudFlare #GitHub
【复刻】GitHub 文件加速
https://hexo.limour.top/-fu-ke-GitHub-wen-jian-jia-su
Author
Limour
Posted on
February 6, 2023
Updated on
March 19, 2024
Licensed under
【迁移】SearXNG：开启morty Previous
【杂感】星之终途完结感想：我所幻想的世界 Next

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