学习&笔记使用cloudflare制作“镜像站” ——可以用于间接访问一些打不开的网站，例如Github

2022年8月14日 432点热度 0人点赞 0条评论

从官网注册之后，会跳转到转到 https://dash.cloudflare.com/，接下来的步骤都是在控制台进行的。

在控制面板主页左侧可以找到workers。如图所示，中间可以创建服务，右侧显示每天的额度，如果只是搭建个人服务这些额度绰绰有余了（但是放在网上公开使用大概率会用完，这也是我推荐大家自己搭建的原因）。下方会显示所有已经搭建的服务。

创建服务，随便填写一个即可，记住下面这个https://xxxx.xxx.workers.dev，此即镜像站的网址。注意服务名称

等待部署完成，回到 https://dash.cloudflare.com/，workers-点击刚刚创建的项目。转到控制界面，可以找到右下角有一个快速编辑的按钮。个人觉得这个设计十分反人类

打开窗口，把代码以下复制进去，保存部署，然后直接访问之前我们记下的链接就好了（也可以在控制台看到）。

// 你要镜像的网站.

const upstream = 'zh.u1lib.org'

// 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 = 'zh.u1lib.org'

// 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',
'//zh.u1lib.org': ''
}

// 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;
}// 你要镜像的网站.
const upstream = 'zh.u1lib.org'