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GPT 4
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前言

感谢代码提供方：

引用站外链接
【教程】几行代码轻松利用 Cloudflare Worker 搭建镜像网站！
腾讯云开发者社区

有时候，一些问题让我们困扰：有人刷网站流量，相加IP黑名单不知道怎么加？很讨厌日本排核污水，想要禁止国外访问？……

那么，Cloudflare Workers可以轻松解决这个问题！

实践

  1. 准备你的Cloudflare账号
  2. 来到主页 -> Workers 和 Pages，点击创建：

  1. 选择创建Workers
  2. 输入名字，其他不用管，点击部署：

  1. 进入控制台，选择编辑代码（右上角）：

  1. 将里面的代码全部删除，粘贴下列代码并做好修改：
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// 反代目标网站（修改）
const upstream = 'google.com'

// 反代目标网站的移动版（没有可不填）
const upstream_mobile = 'google.com'

// 访问区域黑名单（按需设置，使用国家简称，如CN,JP,US等）
const blocked_region = ['TK']

// IP地址黑名单（按需设置）
const blocked_ip_address = ['0.0.0.0', '127.0.0.1']

// 路径替换（你的网站）
const replace_dict = {
'$upstream': '$custom_domain',
'//archiveofourown.org': ''
}

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_host = url.host;

if (url.protocol == 'http:') {
    url.protocol = 'https:'
    response = Response.redirect(url.href);
    return response;
}

if (await device_status(user_agent)) {
    var upstream_domain = upstream;
} else {
    var upstream_domain = upstream_mobile;
}

url.host = upstream_domain;

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', upstream_domain);
    new_request_headers.set('Referer', url.href);

    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('cache-control' ,'public, max-age=14400')
    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_host);
    } 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;
}
  1. 点击右上角部署，等待几分钟即可出现反代网站：

1
https://你填的名字.账户名（邮箱@前的东西）.workers.dev

当你使用限制的IP或国家访问时，会弹出403报错：Access denied: WorkersProxy is not available in your region yet.或Access denied: Your IP address is blocked by WorkersProxy.。

因为workers.dev在中国已被污染无法访问，请自定义域名进行访问：

设置 -> 触发器 -> 添加自定义域

总结

CloudFlare Workers相当于免费给我们多了IP保护，并且每日有10w的请求量，足够一日使用，还自带DDos防护，一举两得。

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