使用Cloudflare Workers加速Gravatar头像

Cloudflare Workers

Cloudflare Workers 能够在无服务器的情况下创建应用程序，并且免费版还提供了每天十万次的请求量，对于我这几乎没人看的小破站来说根本用不完。
不想搭建的小伙伴也可以直接使用我部署的。

https://gravatar.reimu.uk/avatar/

部署

1. 进入 cloudflare官网 ，注册登陆后，点击左侧 Workers和Pages -> 创建Workers 。
   

2. 自定义一个名称后点击部署。
   

3. 点击编辑代码.
   

4. 将下列代码复制进去，点击保存并部署。
   

   
   将带有 *** 的三处换成任意其他站点，也可以镜像其他站。

   // 替换成你想镜像的站点                                              ***
   const upstream = 'cn.gravatar.com'
    
   // 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 = 'cn.gravatar.com'
    
   // 你希望禁止哪些国家访问
   const blocked_region = []
    
   // 禁止自访问
   const blocked_ip_address = []
    
   // 替换成你想镜像的站点                                              ***
   const replace_dict = {
    '$upstream': '$custom_domain',
    '//cn.gravatar.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;
   }

5. 添加自定义域。
   虽然创建Workers后会自动分配一个 *.workers.dev 的子域名，但是 .wokers.dev 似乎也被墙了...所以需要再添加一个域名解析到此Workers上才能够正常访问。注意：目前仅支持 Cloudflare 上处于活动状态的域。如果没有的话，可以把域名添加到 Cloudflare 或者在 Cloudflare 买一个域名。
   添加自定义域后 Cloudflare 会自动解析并添加证书。等待数分钟后，就可以使用啦。
   

本文作者：VeShian

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