使用 Cloudflare Worker 镜像 GitHub 站点-工具盒子

Cloudflare Worker 简介 {#cloudflare-worker-简介}

Cloudflare Worker 是 Cloudflare 公司提供的一项服务，它允许开发者在 Cloudflare 的边缘服务器上运行自定义的 JavaScript 代码。通俗地说，它就像是一个小型的服务器，可以在互联网上的不同地点快速执行你编写的代码。

Cloudflare Worker 的主要用途包括网站加速和优化、路由请求、访问控制、CDN 功能增强、网站镜像与转发等。

本文将使用其网站镜像和访问控制的能力，实现 GitHub 站点的镜像，并通过自有域名实现在墙内的访问。

镜像 GitHub 站点 {#镜像-github-站点}

1.创建 Worker {#1创建-worker}

首先，登录 Cloudflare，切换至Workers & Pages菜单，点击Create Application按钮：

然后，点击Create Worker按钮新建一个 Worker：

接着，设置一个三级域名 gh.harrisonwang.workers.dev，点击Deploy按钮：

再接着，我们点击Edit code按钮编辑代码：

最后，粘贴以下代码片段后，点击Save and Deploy完成部署，然后通过域名 gh.harrisonwang.workers.dev 访问镜像站：

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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | // 你要镜像的网站. const upstream = 'github.com' // 镜像网站的目录，比如你想镜像某个网站的二级目录则填写二级目录的目录名，镜像 google 用不到，默认即可. const upstream_path = '/' // 镜像站是否有手机访问专用网址，没有则填一样的. const upstream_mobile = 'github.com' // 屏蔽国家和地区. const blocked_region = ['KP', 'SY', 'PK', 'CU'] // 屏蔽 IP 地址. const blocked_ip_address = ['0.0.0.0', '127.0.0.1'] // 镜像站是否开启 HTTPS. const https = true // 文本替换. const replace_dict = {'$upstream': '$custom_domain', '//github.com': ''} // 以下保持默认，不要动 addEventListener('fetch', event => { event.respondWith(fetchAndApply(event.request)) }) async function fetchAndApply(request) { const region = request.headers.get('cf-ipcountry').toUpperCase() const ip_address = request.headers.get('cf-connecting-ip') const user_agent = request.headers.get('user-agent') let response = null let url = new URL(request.url) let url_hostname = url.hostname if (https == true) { url.protocol = 'https:' } else { url.protocol = 'http:' } if (await device_status(user_agent)) { var upstream_domain = upstream } else { var upstream_domain = upstream_mobile } url.host = upstream_domain if (url.pathname == '/') { url.pathname = upstream_path } else { url.pathname = upstream_path + url.pathname } if (blocked_region.includes(region)) { response = new Response('Access denied: WorkersProxy is not available in your region yet.', { status: 403 }) } else if (blocked_ip_address.includes(ip_address)) { response = new Response('Access denied: Your IP address is blocked by WorkersProxy.', { status: 403 }) } else { let method = request.method let request_headers = request.headers let new_request_headers = new Headers(request_headers) `new_request_headers.set('Host', url.hostname) new_request_headers.set('Referer', url.hostname) let original_response = await fetch(url.href, { method: method, headers: new_request_headers }) let original_response_clone = original_response.clone() let original_text = null let response_headers = original_response.headers let new_response_headers = new Headers(response_headers) let status = original_response.status new_response_headers.set('access-control-allow-origin', '*') new_response_headers.set('access-control-allow-credentials', true) new_response_headers.delete('content-security-policy') new_response_headers.delete('content-security-policy-report-only') new_response_headers.delete('clear-site-data') const content_type = new_response_headers.get('content-type') if (content_type.includes('text/html') && content_type.includes('UTF-8')) { original_text = await replace_response_text(original_response_clone, upstream_domain, url_hostname) } else { original_text = original_response_clone.body } response = new Response(original_text, { status, headers: new_response_headers }) ` } return response } async function replace_response_text(response, upstream_domain, host_name) { let text = await response.text() var i, j for (i in replace_dict) { j = replace_dict[i] `if (i == '$upstream') { i = upstream_domain } else if (i == '$custom_domain') { i = host_name } if (j == '$upstream') { j = upstream_domain } else if (j == '$custom_domain') { j = host_name } let re = new RegExp(i, 'g') text = text.replace(re, j) ` } return text } async function device_status(user_agent_info) { var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"] var flag = true for (var v = 0; v < agents.length; v++) { if (user_agent_info.indexOf(agents[v]) > 0) { flag = false break } } return flag } |

至此，镜像 GitHub 站点已完成，我们任意搜索一个 strapi 的开源库，搜索结果如下图图所示。但是由于国内 workers.dev 域名的 DNS 已污染导致无法访问，所以需要绑定一个自定义域名来绕过该问题。