'use strict'
const hub_host = 'registry-1.docker.io'
const auth_url = 'https://auth.docker.io'
const workers_url = 'https://your-domain'
//const home_page_url = 'remote-html-link'
/** @type {RequestInit} */
const PREFLIGHT_INIT = {
status: 204,
headers: new Headers({
'access-control-allow-origin': '*',
'access-control-allow-methods': 'GET,POST,PUT,PATCH,TRACE,DELETE,HEAD,OPTIONS',
'access-control-max-age': '1728000',
}),
}
/**
* @param {any} body
* @param {number} status
* @param {Object<string, string>} headers
*/
function makeRes(body, status = 200, headers = {}) {
headers['access-control-allow-origin'] = '*'
return new Response(body, {status, headers})
}
/**
* @param {string} urlStr
*/
function newUrl(urlStr) {
try {
return new URL(urlStr)
} catch (err) {
return null
}
}
addEventListener('fetch', e => {
const ret = fetchHandler(e)
.catch(err => makeRes('cfworker error:\n' + err.stack, 502))
e.respondWith(ret)
})
/**
* @param {FetchEvent} e
*/
async function fetchHandler(e) {
const getReqHeader = (key) => e.request.headers.get(key);
let url = new URL(e.request.url);
if (url.pathname === '/') {
// Fetch and return the home page HTML content
//return fetch(home_page_url);
return new Response(indexHtml, {
headers: {
'Content-Type': 'text/html'
}
});
}
if (url.pathname === '/token') {
let token_parameter = {
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'
}
};
let token_url = auth_url + url.pathname + url.search
return fetch(new Request(token_url, e.request), token_parameter)
}
url.hostname = hub_host;
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
};
if (e.request.headers.has("Authorization")) {
parameter.headers.Authorization = getReqHeader("Authorization");
}
let original_response = await fetch(new Request(url, e.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;
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));
}
if (new_response_headers.get("Location")) {
return httpHandler(e.request, new_response_headers.get("Location"))
}
let response = new Response(original_text, {
status,
headers: new_response_headers
})
return response;
}
/**
* @param {Request} req
* @param {string} pathname
*/
function httpHandler(req, pathname) {
const reqHdrRaw = req.headers
// preflight
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, 0)
}
/**
*
* @param {URL} urlObj
* @param {RequestInit} reqInit
*/
async function proxy(urlObj, reqInit, rawLen) {
const res = await fetch(urlObj.href, reqInit)
const resHdrOld = res.headers
const resHdrNew = new Headers(resHdrOld)
// verify
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')
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
})
}
const indexHtml = `
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Setting Up Docker Hub Registry Mirror on Linux</title>
<style>
body {
max-width: 800px;
margin: 0 auto;
padding: 20px;
line-height: 1.6;
color: #333;
background-color: #f7f7f7;
}
h1 {
color: #0066cc;
margin-bottom: 30px;
}
h2 {
color: #0066cc;
margin-top: 40px;
}
pre {
background-color: #fff;
padding: 15px;
padding-top: 48px;
overflow-x: auto;
border-radius: 8px;
box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}
ol {
margin-top: 20px;
padding-left: 20px;
}
li {
margin-bottom: 10px;
}
code {
font-family: Consolas, monospace;
background-color: #fff;
padding: 2px 4px;
border-radius: 3px;
}
.container {
background-color: #fff;
padding: 30px;
border-radius: 8px;
box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}
.copy-btn {
position: absolute;
top: 10px;
right: 10px;
padding: 4px 10px;
background-color: #0066cc;
color: #fff;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 14px;
transition: background-color 0.3s;
}
.copy-btn:hover {
background-color: #0052a3af;
}
.code-wrapper {
position: relative;
}
</style>
</head>
<body>
<div class="container">
<h1>Setting Up Docker Hub Registry Mirror on Linux</h1>
<p>To speed up the download speed of Docker images, you can set up a registry mirror for Docker Hub.</p>
<h2>Setup Steps</h2>
<ol>
<li>Create or edit the <code>/etc/docker/daemon.json</code> file and add the following content:</li>
</ol>
<div class="code-wrapper">
<pre>
echo '{"registry-mirrors": ["${workers_url}"]}' | sudo tee /etc/docker/daemon.json > /dev/null</pre>
<button class="copy-btn" onclick="copyCode(this)">Copy</button>
</div>
<ol start="2">
<li>Restart the Docker service:</li>
</ol>
<div class="code-wrapper">
<pre>sudo systemctl restart docker</pre>
<button class="copy-btn" onclick="copyCode(this)">Copy</button>
</div>
<p>After the setup is complete, Docker will pull images from the registry mirror you configured, speeding up the image download process.</p>
</div>
<script>
function copyCode(btn) {
const pre = btn.previousElementSibling;
const code = pre.innerText;
navigator.clipboard.writeText(code).then(function () {
btn.innerText = 'Copied';
setTimeout(function () {
btn.innerText = 'Copy';
}, 2000);
}, function () {
alert('Copy failed, please copy manually.');
});
}
</script>
</body>
</html>
`
