CloudFlare Workers 反代任意网站和挂载单页代码

介绍 CloudFlare Workers是一个支持jsproxy的无服务器函数服务，提供全球CDN支持，免费用户有每天10万请求额度； CloudFlare官网：https://dash.cloudflare.com 记录下一些简单的使用方法，以后再陆续更新； Workers 单页挂载代码 
addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})


// HTML代码
let html = <!DOCTYPE html> <html>   <head><title>Test</title></head>   <body><div>Hello world!</div></body> </html>;


/**


    

  • Respond to the request
    • 

  • @param {Request} request
    • 

  • /
    async function handleRequest(request) {
    return new Response(html, {
      headers: {
    'Content-Type': 'text/html; charset=UTF-8'

    
  },
      status: 200
    })
    }

Workers 反代任意网站
// Website you intended to retrieve for users.
const upstream = 'sunpma.com'


// Custom pathname for the upstream website.
const upstream_path = ‘/‘


// Website you intended to retrieve for users using mobile devices.
const upstream_mobile = ‘sunpma.com’


// Countries and regions where you wish to suspend your service.
const blocked_region = [‘KP’, ‘SY’, ‘PK’, ‘CU’]


// IP addresses which you wish to block from using your service.
const blocked_ip_address = [‘0.0.0.0’, ‘127.0.0.1’]


// Whether to use HTTPS protocol for upstream address.
const https = true


// Whether to disable cache.
const disable_cache = false


// Replace texts.
const replace_dict = {
    ‘$upstream’: ‘$custom_domain’,
    ‘//sunpma.com’: ‘’
}


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', upstream_domain);
    new_request_headers.set('Referer', url.protocol + '//' + url_hostname);

    let original_response = await fetch(url.href, {
        method: method,
        headers: new_request_headers
    })

    connection_upgrade = new_request_headers.get("Upgrade");
    if (connection_upgrade && connection_upgrade.toLowerCase() == "websocket") {
        return original_response;
    }

    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;
    
    if (disable_cache) {
        new_response_headers.set('Cache-Control', 'no-store');
    }

    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');
    
    if (new_response_headers.get("x-pjax-url")) {
        new_response_headers.set("x-pjax-url", response_headers.get("x-pjax-url").replace("//" + upstream_domain, "//" + url_hostname));
    }
    
    const content_type = new_response_headers.get('content-type');
    if (content_type != null && 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;
}

替换掉其中的sunpma.com为你需要反代的网址即可；