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'use strict';

const hub_host = 'registry-1.docker.io';
const auth_url = 'https://auth.docker.io';
const worker_url = '';   改为你配置好的Custom Domain

/**
 * 静态文件 (404.html、sw.js、conf.js)
 */

/** @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 === '/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 parameters = {
    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')) {
    parameters.headers.Authorization = getReqHeader('Authorization');
  }

  let original_response = await fetch(new Request(url, e.request), parameters);
  let original_response_clone = original_response.clone();
  let original_text = await original_response_clone.text();
  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, worker_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;

  // 预检
  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);
}

/**
 * @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);

  // 验证
  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 });
}