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// 你要镜像的网站.
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const upstream = 'github.com'
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// 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.
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const upstream_path = '/'
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// 镜像站是否有手机访问专用网址，没有则填一样的.
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const upstream_mobile = 'github.com'
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// 屏蔽国家和地区.
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const blocked_region = ['KP', 'SY', 'PK', 'CU']
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// 屏蔽 IP 地址.
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const blocked_ip_address = ['0.0.0.0', '127.0.0.1']
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// 镜像站是否开启 HTTPS.
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const https = true
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// 文本替换.
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const replace_dict = {
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    '$upstream': '$custom_domain',
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    '//github.com': ''
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}
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// 以下保持默认，不要动
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addEventListener('fetch', event => {
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    event.respondWith(fetchAndApply(event.request));
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})
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async function fetchAndApply(request) {
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    const region = request.headers.get('cf-ipcountry').toUpperCase();
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    const ip_address = request.headers.get('cf-connecting-ip');
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    const user_agent = request.headers.get('user-agent');
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    let response = null;
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    let url = new URL(request.url);
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    let url_hostname = url.hostname;
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    if (https == true) {
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        url.protocol = 'https:';
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    } else {
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        url.protocol = 'http:';
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    }
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    if (await device_status(user_agent)) {
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        var upstream_domain = upstream;
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    } else {
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        var upstream_domain = upstream_mobile;
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    }
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    url.host = upstream_domain;
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    if (url.pathname == '/') {
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        url.pathname = upstream_path;
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    } else {
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        url.pathname = upstream_path + url.pathname;
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    }
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    if (blocked_region.includes(region)) {
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        response = new Response('Access denied: WorkersProxy is not available in your region yet.', {
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            status: 403
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        });
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    } else if (blocked_ip_address.includes(ip_address)) {
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        response = new Response('Access denied: Your IP address is blocked by WorkersProxy.', {
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            status: 403
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        });
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    } else {
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        let method = request.method;
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        let request_headers = request.headers;
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        let new_request_headers = new Headers(request_headers);
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        new_request_headers.set('Host', url.hostname);
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        new_request_headers.set('Referer', url.hostname);
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        let original_response = await fetch(url.href, {
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            method: method,
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            headers: new_request_headers
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        })
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        let original_response_clone = original_response.clone();
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        let original_text = null;
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        let response_headers = original_response.headers;
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        let new_response_headers = new Headers(response_headers);
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        let status = original_response.status;
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        new_response_headers.set('access-control-allow-origin', '*');
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        new_response_headers.set('access-control-allow-credentials', true);
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        new_response_headers.delete('content-security-policy');
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        new_response_headers.delete('content-security-policy-report-only');
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        new_response_headers.delete('clear-site-data');
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        const content_type = new_response_headers.get('content-type');
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        if (content_type.includes('text/html') && content_type.includes('UTF-8')) {
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            original_text = await replace_response_text(original_response_clone, upstream_domain, url_hostname);
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        } else {
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            original_text = original_response_clone.body
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        }
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        response = new Response(original_text, {
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            status,
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            headers: new_response_headers
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        })
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    }
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    return response;
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}
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async function replace_response_text(response, upstream_domain, host_name) {
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    let text = await response.text()
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    var i, j;
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    for (i in replace_dict) {
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        j = replace_dict[i]
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        if (i == '$upstream') {
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            i = upstream_domain
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        } else if (i == '$custom_domain') {
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            i = host_name
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        }
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        if (j == '$upstream') {
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            j = upstream_domain
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        } else if (j == '$custom_domain') {
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            j = host_name
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        }
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        let re = new RegExp(i, 'g')
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        text = text.replace(re, j);
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    }
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    return text;
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}
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async function device_status(user_agent_info) {
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    var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
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    var flag = true;
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    for (var v = 0; v < agents.length; v++) {
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        if (user_agent_info.indexOf(agents[v]) > 0) {
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            flag = false;
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            break;
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        }
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    }
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    return flag;
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}