引言

搭建教程

1.创建Workers

2.跳过存储库设置，立即部署“Hello World”Worker

/**
 * Welcome to Cloudflare Workers! This is your first worker.
 *
 * - Run "npm run dev" in your terminal to start a development server
 * - Open a browser tab at http://localhost:8787/ to see your worker in action
 * - Run "npm run deploy" to publish your worker
 *
 * Learn more at https://developers.cloudflare.com/workers/
 */


// 你要镜像的网站.
const upstream = ''

// 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 = ''

// 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;
}

结语