使用Cloudflare Workers反代Gravatar头像

前两天,写了一篇文章《Gravatar 头像被墙无法显示?用国内镜像替代即可》,里面有很多知名的国内Gravatar头像服务。作为一位折腾帝,总觉得别人的不可靠,稳定性差。于是,我自建了一个Gravatar代理服务,用的方法是Cloudflare Workers反代,白嫖cf,效果还不错。

自建Gravatar代理服务:https://gravatar.lingchenzi.com

如何使用:Gravatar 头像被墙无法显示?用国内镜像替代即可

Cloudflare Workers的名称来自Web Workers,更具体地说是Service Workers,一个用于在web浏览器后台运行并拦截HTTP请求的脚本的W3C标准API。Cloudflare Workers是针对相同的标准API编写的,但是是在Cloudflare的服务器上运行,而不是在浏览器中运行。

Cloudflare Workers免费套餐:每天100,000请求

Cloudflare Workers特点:

  • 使用最新的标准语言功能执行任意JavaScript代码。
  • 拦截和修改HTTP请求和响应URL,状态,标头和正文内容。
  • 直接从您的Worker响应请求,或将其转发到其他地方。
  • 将HTTP请求发送到第三方服务器。
  • 以串行或并行方式发送多个请求,并使用响应组成对原始请求的最终响应。
  • 在响应已经返回到客户端之后发送异步请求(例如,用于记录或分析)。
  • 控制其他Cloudflare功能,例如缓存行为。

创建了Workers后,直接把代码复制即可。

代码如下:

https://github.com/lingchenzi/blog/blob/main/cloudflare-workers-gravatar

// 替换成你想镜像的站点
const upstream = 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 = '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 = ['0.0.0.0', '127.0.0.1']
 
// 替换成你想镜像的站点
const replace_dict = {
    '$upstream': '$custom_domain',
    '//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;
}

你可以重命名创建的Workers为gravata,也可以将自定义域名绑定到Workers上面,下一篇再讲如何绑定自定义域名到CloudFlare Workers。

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