使用 cloudflare 反代 gravatar 免费生成国内镜像

cloudflare 有一个非常好用的功能—Workers,可以在无服务器的状态下运行一些程序,包括常见的反向代理等。

所以我利用这一功能实现对 gravatar 反代,达到国内访问加速的目的。

话不多说,开始流程操作,分享我的部署过程。

1.登陆后,在主页点击左侧的 Workers,然后点击创建服务

2.服务名称随意填写,然后点击右下角创建。

3.点击右上角快速编辑

4.在左侧编辑器中输入下列的代码

点击展开代码

代码语言:javascript
复制
// 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 = []

// 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;
}

然后点击保存并部署,就可以成功反代 gravatar 镜像了。

然后照葫芦画瓢,可以通过这种方式反代任何网站,我就使用 https://zsh.im 反代了我的国内博客 https://zburu.com

访问起来大致无压力,延迟100+ms左右。

5.自定义域名

在触发器中可以找到自定义域名选项,输入已经绑定 cloudflare 的域名,再次赞美 cloudflare,如果事前绑定好了域名,在这里可以直接输入二级域名,cloudflare 会自动解析,全部都是自动化的。

在主页左侧的 网站 绑定域名。

代码语言:javascript
复制
# 分享我的免费镜像。
https://gravatar.zsh.im/avatar