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Baboonowen
V2EX  ›  互联网

献丑了,也搞了个 Github 代下载服务,估计不永久但免费

  •  
  •   Baboonowen · 2020-03-21 20:24:10 +08:00 · 2897 次点击
    这是一个创建于 1709 天前的主题,其中的信息可能已经有所发展或是发生改变。

    其实就是利用 Cloudflare Workers,很简单,V 友们肯定懂:

    // Website you intended to retrieve for users.
    const upstream = 'github.com'
    
    // Custom pathname for the upstream website.
    const upstream_path = '/'
    
    // Website you intended to retrieve for users using mobile devices.
    const upstream_mobile = 'github.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
    
    // Replace texts.
    const replace_dict = {
        '$upstream': '$custom_domain',
        '//github.com': '',
        'Sign&nbsp;in':'<del style="color:#cccccc">Sign in disabled</del>',
        'Sign&nbsp;up':'<del style="color:#cccccc">Sign up disabled</del>',
    }
    //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,
                cf: { cacheEverything: true }
            })
     
            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;
    }
    
    1 条回复    2020-03-21 22:09:09 +08:00
    alect
        1
    alect  
       2020-03-21 22:09:09 +08:00
    赞一个。。
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