使用cloudflare制作GitHub“镜像站”

// 你要镜像的网站.
const upstream = www.github.com

// 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 = www.github.com

// 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;
}

https://kermgithub.kermshare.workers.dev/Fndroid/clash_for_windows_pkg/releases/download/0.19.1/Clash.for.Windows.Setup.0.19.1.exe