【教程】几行代码轻松利用 Cloudflare Worker 搭建镜像网站！

前言
今天教大家一种新的关于 CloudFlare Worker 的玩法 - 利用 Cloudflare Worker 搭建镜像网站！
CloudFlare Worker 每天免费 10万次 请求也足以应对个人使用或者是小范围分享了

搭建教程

1. 点击 创建 Worker
   
2. 将原有的示例代码全部删除

3. 将下方代码全部粘贴到代码框里，如下图所示：

   ♾️ js 代码:

    // 反代目标网站.
    const upstream = 'lb5.net'
    // 反代目标网站的移动版.
    const upstream_mobile = 'lb5.net'
    // 访问区域黑名单（按需设置）.
    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.
    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;
    }

4. 粘贴好后按需修改下方参数，修改好之后，点击 保存并部署

const upstream = '反代目标网站'

const upstream_mobile = '反代目标网站的移动版'

const blocked_region = ['访问区域黑名单（按需设置）']

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

const replace_dict = 路径替换