google 代码

怼烎@ 2023-07-21 08:37 9阅读 0赞

// 替换成你想镜像的站点
    const upstream = 'www.google.com.hk'
     
    // 如果那个站点有专门的移动适配站点，否则保持和上面一致
    const upstream_mobile = 'www.google.com.hk'
     
    // 你希望禁止哪些国家访问
    const blocked_region = ['KP']
     
    // 禁止自访问
    const blocked_ip_address = ['0.0.0.0', '127.0.0.1']
     
    // 替换成你想镜像的站点
    const replace_dict = {
        '$upstream': '$custom_domain',
        '//google.com': ''
    }
     
    //以下内容都不用动
    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_host = url.host;
     
        if (url.protocol == 'http:') {
            url.protocol = 'https:'
            response = Response.redirect(url.href);
            return response;
        }
     
        if (await device_status(user_agent)) {
            upstream_domain = upstream
        } else {
            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('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;
    }