Cloudflare搭建docker加速

[MD]

国内环境很难访问DockerHub，而且禁止匿名拉取还有限制。

那么我们可以搭建一个Cloudflare的Workers

代码如下：

// _worker.js

// Docker镜像仓库主机地址
let hub_host = 'registry-1.docker.io'
// Docker认证服务器地址
const auth_url = 'https://auth.docker.io'
// 自定义的工作服务器地址
let workers_url = 'https://你的域名'

// 根据主机名选择对应的上游地址
function routeByHosts(host) {
        // 定义路由表
    const routes = {
        // 生产环境
        "quay": "quay.io",
        "gcr": "gcr.io",
        "k8s-gcr": "k8s.gcr.io",
        "k8s": "registry.k8s.io",
        "ghcr": "ghcr.io",
        "cloudsmith": "docker.cloudsmith.io",
        
        // 测试环境
        "test": "registry-1.docker.io",
    };

    if (host in routes) return [ routes[host], false ];
    else return [ hub_host, true ];
}

/** @type {RequestInit} */
const PREFLIGHT_INIT = {
    // 预检请求配置
    headers: new Headers({
        'access-control-allow-origin': '*', // 允许所有来源
        'access-control-allow-methods': 'GET,POST,PUT,PATCH,TRACE,DELETE,HEAD,OPTIONS', // 允许的HTTP方法
        'access-control-max-age': '1728000', // 预检请求的缓存时间
    }),
}

/**
 * 构造响应
 * @param {any} body 响应体
 * @param {number} status 响应状态码
 * @param {Object<string, string>} headers 响应头
 */
function makeRes(body, status = 200, headers = {}) {
    headers['access-control-allow-origin'] = '*' // 允许所有来源
    return new Response(body, { status, headers }) // 返回新构造的响应
}

/**
 * 构造新的URL对象
 * @param {string} urlStr URL字符串
 */
function newUrl(urlStr) {
    try {
        return new URL(urlStr) // 尝试构造新的URL对象
    } catch (err) {
        return null // 构造失败返回null
    }
}

function isUUID(uuid) {
    // 定义一个正则表达式来匹配 UUID 格式
    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[4][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
    
    // 使用正则表达式测试 UUID 字符串
    return uuidRegex.test(uuid);
}

async function nginx() {
    const text = `
    <!DOCTYPE html>
    <html>
    <head>
    <title>Welcome to nginx!</title>
    <style>
        body {
            width: 35em;
            margin: 0 auto;
            font-family: Tahoma, Verdana, Arial, sans-serif;
        }
    </style>
    </head>
    <body>
    <h1>Welcome to nginx!</h1>
    <p>If you see this page, the nginx web server is successfully installed and
    working. Further configuration is required.</p>
    
    <p>For online documentation and support please refer to
    <a href="http://nginx.org/">nginx.org</a>.<br/>
    Commercial support is available at
    <a href="http://nginx.com/">nginx.com</a>.</p>
    
    <p><em>Thank you for using nginx.</em></p>
    </body>
    </html>
    `
    return text ;
}

export default {
    async fetch(request, env, ctx) {
        const getReqHeader = (key) => request.headers.get(key); // 获取请求头

        let url = new URL(request.url); // 解析请求URL

        // 访问口令校验：要求 docker login 时使用你设置的用户名/密码
        // 这里复用标准 docker 认证协议，在换取 token 的环节校验 Basic Auth
        // 用来防止别人扫描到这个域名后盗用，把你的 Docker Hub 账号额度刷爆
        workers_url = `https://${url.hostname}`;
        const pathname = url.pathname;
        const hostname = url.searchParams.get('hubhost') || url.hostname; 
        const hostTop = hostname.split('.')[0];// 获取主机名的第一部分
        const checkHost = routeByHosts(hostTop);
        hub_host = checkHost[0]; // 获取上游地址
        const fakePage = checkHost[1];
        console.log(`域名头部: ${hostTop}\n反代地址: ${hub_host}\n伪装首页: ${fakePage}`);
        const isUuid = isUUID(pathname.split('/')[1].split('/')[0]);
        
        const conditions = [
            isUuid,
            pathname.includes('/_'),
            pathname.includes('/r'),
            pathname.includes('/v2/user'),
            pathname.includes('/v2/orgs'),
            pathname.includes('/v2/_catalog'),
            pathname.includes('/v2/categories'),
            pathname.includes('/v2/feature-flags'),
            pathname.includes('search'),
            pathname.includes('source'),
            pathname === '/',
            pathname === '/favicon.ico',
            pathname === '/auth/profile',
        ];

        if (conditions.some(condition => condition) && (fakePage === true || hostTop == 'docker')) {
            if (env.URL302){
                return Response.redirect(env.URL302, 302);
            } else if (env.URL){
                if (env.URL.toLowerCase() == 'nginx'){
                    //首页改成一个nginx伪装页
                    return new Response(await nginx(), {
                        headers: {
                            'Content-Type': 'text/html; charset=UTF-8',
                        },
                    });
                } else return fetch(new Request(env.URL, request));
            }
            
            const newUrl = new URL("https://registry.hub.docker.com" + pathname + url.search);

            // 复制原始请求的标头
            const headers = new Headers(request.headers);

            // 确保 Host 头部被替换为 hub.docker.com
            headers.set('Host', 'registry.hub.docker.com');

            const newRequest = new Request(newUrl, {
                    method: request.method,
                    headers: headers,
                    body: request.method !== 'GET' && request.method !== 'HEAD' ? await request.blob() : null,
                    redirect: 'follow'
            });

            return fetch(newRequest);
        }

        // 修改包含 %2F 和 %3A 的请求
        if (!/%2F/.test(url.search) && /%3A/.test(url.toString())) {
            let modifiedUrl = url.toString().replace(/%3A(?=.*?&)/, '%3Alibrary%2F');
            url = new URL(modifiedUrl);
            console.log(`handle_url: ${url}`)
        }

        // 处理token请求
        if (url.pathname.includes('/token')) {
            // 访问口令校验：docker login 时填写的用户名/密码需要匹配 ACCESS_USER/ACCESS_KEY
            // 防止别人扫描到域名后盗用，把你的 Docker Hub 账号额度刷爆
            if (env.ACCESS_KEY) {
                const clientAuth = getReqHeader('Authorization');
                const expected = 'Basic ' + btoa(`${env.ACCESS_USER || 'sunplace'}:${env.ACCESS_KEY}`);
                if (clientAuth !== expected) {
                    // 返回标准的未授权响应，docker 客户端会提示需要先 docker login
                    return makeRes('Unauthorized: docker login required', 401, {
                        'Www-Authenticate': `Basic realm="${workers_url}"`
                    });
                }
            }

            let token_headers = {
                'Host': 'auth.docker.io',
                'User-Agent': getReqHeader("User-Agent"),
                'Accept': getReqHeader("Accept"),
                'Accept-Language': getReqHeader("Accept-Language"),
                'Accept-Encoding': getReqHeader("Accept-Encoding"),
                'Connection': 'keep-alive',
                'Cache-Control': 'max-age=0'
            };

            // 用你自己的 Docker Hub 账号换取 token，避免匿名限流
            // 需要在 Worker 的环境变量里配置 DOCKER_USERNAME 和 DOCKER_PASSWORD(即 Access Token)
            if (env.DOCKER_USERNAME && env.DOCKER_PASSWORD) {
                const basicAuth = btoa(`${env.DOCKER_USERNAME}:${env.DOCKER_PASSWORD}`);
                token_headers['Authorization'] = `Basic ${basicAuth}`;
            }

            let token_parameter = { headers: token_headers };
            let token_url = auth_url + url.pathname + url.search
            return fetch(new Request(token_url, request), token_parameter)
        }

        // 修改 /v2/ 请求路径
        if (/^\/v2\/[^/]+\/[^/]+\/[^/]+$/.test(url.pathname) && !/^\/v2\/library/.test(url.pathname)) {
            url.pathname = url.pathname.replace(/\/v2\//, '/v2/library/');
            console.log(`modified_url: ${url.pathname}`)
        }

        // 更改请求的主机名
        url.hostname = hub_host;

        // 构造请求参数
        let parameter = {
            headers: {
                'Host': hub_host,
                'User-Agent': getReqHeader("User-Agent"),
                'Accept': getReqHeader("Accept"),
                'Accept-Language': getReqHeader("Accept-Language"),
                'Accept-Encoding': getReqHeader("Accept-Encoding"),
                'Connection': 'keep-alive',
                'Cache-Control': 'max-age=0'
            },
            cacheTtl: 3600 // 缓存时间
        };

        // 添加Authorization头
        if (request.headers.has("Authorization")) {
            parameter.headers.Authorization = getReqHeader("Authorization");
        }

        // 发起请求并处理响应
        let original_response = await fetch(new Request(url, request), parameter)
        let original_response_clone = original_response.clone();
        let original_text = original_response_clone.body;
        let response_headers = original_response.headers;
        let new_response_headers = new Headers(response_headers);
        let status = original_response.status;

        // 修改 Www-Authenticate 头
        if (new_response_headers.get("Www-Authenticate")) {
            let auth = new_response_headers.get("Www-Authenticate");
            let re = new RegExp(auth_url, 'g');
            new_response_headers.set("Www-Authenticate", response_headers.get("Www-Authenticate").replace(re, workers_url));
        }

        // 处理重定向
        if (new_response_headers.get("Location")) {
            return httpHandler(request, new_response_headers.get("Location"))
        }

        // 返回修改后的响应
        let response = new Response(original_text, {
            status,
            headers: new_response_headers
        })
        return response;
    }
};

/**
 * 处理HTTP请求
 * @param {Request} req 请求对象
 * @param {string} pathname 请求路径
 */
function httpHandler(req, pathname) {
    const reqHdrRaw = req.headers

    // 处理预检请求
    if (req.method === 'OPTIONS' &&
        reqHdrRaw.has('access-control-request-headers')
    ) {
        return new Response(null, PREFLIGHT_INIT)
    }

    let rawLen = ''

    const reqHdrNew = new Headers(reqHdrRaw)

    const refer = reqHdrNew.get('referer')

    let urlStr = pathname

    const urlObj = newUrl(urlStr)

    /** @type {RequestInit} */
    const reqInit = {
        method: req.method,
        headers: reqHdrNew,
        redirect: 'follow',
        body: req.body
    }
    return proxy(urlObj, reqInit, rawLen)
}

/**
 * 代理请求
 * @param {URL} urlObj URL对象
 * @param {RequestInit} reqInit 请求初始化对象
 * @param {string} rawLen 原始长度
 */
async function proxy(urlObj, reqInit, rawLen) {
    const res = await fetch(urlObj.href, reqInit)
    const resHdrOld = res.headers
    const resHdrNew = new Headers(resHdrOld)

    // 验证长度
    if (rawLen) {
        const newLen = resHdrOld.get('content-length') || ''
        const badLen = (rawLen !== newLen)

        if (badLen) {
            return makeRes(res.body, 400, {
                '--error': `bad len: ${newLen}, except: ${rawLen}`,
                'access-control-expose-headers': '--error',
            })
        }
    }
    const status = res.status
    resHdrNew.set('access-control-expose-headers', '*')
    resHdrNew.set('access-control-allow-origin', '*')
    resHdrNew.set('Cache-Control', 'max-age=1500')

    // 删除不必要的头
    resHdrNew.delete('content-security-policy')
    resHdrNew.delete('content-security-policy-report-only')
    resHdrNew.delete('clear-site-data')

    return new Response(res.body, {
        status,
        headers: resHdrNew
    })
}

注册一个dockerhub账户，在Personal access tokens里加一个token

把CF Workers的设置里Runtime variables and secrets填入以下信息

DOCKER_USERNAME 填 {你的自定义登录用户名}

DOCKER_PASSWORD 填那个 Access Token（建议加密）

ACCESS_KEY 填你自己定的一个口令密码，比如随便一串字符（建议加密）

ACCESS_USER 可选，不填的话代码里默认是{你的自定义登录用户名}，你也可以自己定一个别的用户名。

最后在需要使用的Linux里运行：

docker login {dockerhub镜像域名}

输入用户名：{你的自定义登录用户名}

输入密码：{ACCESS_KEY}

最后见到


Error response from daemon: Get "https://dockerhub.kkii.site/v2/": unauthorized: Unauthorized: docker login required

就可以正常运行docker命令了。

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