sw.js

var CACHE_NAME = 'v1';
var assetServerUrl = 'https://assets.ubuntu.com';
var thirdPartyAssetPaths = [
  '/v1/1958451f-pictogram_lightweight01b-dark.svg',
  '/v1/730b14b9-pictogram_extension01-dark.svg',
  '/v1/ff78e55c-pictogram_opensource01-dark.svg',
  '/v1/e2ac88af-juju_black-orange_hex.svg',
  '/v1/739d1f1f-guidelines-illustration.svg',
  '/v1/0276b842-github-icon.svg',
  '/v1/9a5b9c51-sketch-icon.svg',
  '/v1/ff7dd096-logo-canonical-aubergine.svg',
  '/v1/3b52f57c-ubuntu.svg',
  '/v1/01c0e480-landscape_black-orange_hex.svg',
  '/v1/9d12b4c4-maas_black-orange_hex.svg',
  '/v1/ffa38040-juju_black-orange_hex.svg',
  '/v1/41e2722c-core_logo.svg',
  '/v1/3f0091ee-conjure-up-logo-black.svg',
  '/v1/ea4e7803-snapcraft_green-red_su_hex_cropped.svg',
  '/v1/e0d78513-cloud-init-logo-updated.svg',
  '/v1/f53c4e01-icon-slack.svg',
  '/v1/7eae50ca-icon-twitter.svg',
  '/v1/f307a122-icon-github.svg'
];

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(CACHE_NAME).then(function(cache) {
      thirdPartyAssetPaths.forEach(function(assetPath) {
        var request = new Request(assetServerUrl + assetPath, {
          mode: 'no-cors'
        });

        fetch(request).then(function(response) {
          cache.put(request, response);
        });
      });

      return cache.addAll([
        '/',
        '/index.html',
        '/index.html?homescreen=1',
        '/?homescreen=1',
        '/accessibility.html',
        '/browser-support.html',
        '/coding-standards.html',
        '/contribute.html',
        '/css/main.css'
      ]);
    })
  );
});

self.addEventListener('fetch', function(event) {

  event.respondWith(
    caches.match(event.request).then(function(response) {
      return response || fetch(event.request);
    })
  );
});