1/**
2 * Copyright (c) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you
5 * may not use this file except in compliance with the License. You may
6 * obtain a copy of the License at
7 *
8 *   http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
13 * implied. See the License for the specific language governing
14 * permissions and limitations under the License.
15 */
16
17'use strict';
18
19const CACHE_NAME = 'travis-cache';
20const JOBS_URL = 'https://api.travis-ci.org/jobs/';
21
22async function FetchAndCacheIfJob(event) {
23  if (!event.request.url.startsWith(JOBS_URL)) {
24    return fetch(event.request);
25  }
26
27  // Try and retrieve from the cache.
28  const cachedResponse = await caches.match(event.request);
29  if (cachedResponse) {
30    return cachedResponse;
31  }
32
33  // If network request failed just return the response.
34  const response = await fetch(event.request);
35  if (!response || response.status !== 200) {
36    return response;
37  }
38
39  // Extract the JSON from the response.
40  const json = await response.clone().json();
41  if (json.state !== 'cancelled' && json.state !== 'finished') {
42    return response;
43  }
44
45  var responseToCache = response.clone();
46  caches.open(CACHE_NAME)
47    .then(cache => {
48      cache.put(event.request, responseToCache);
49    });
50
51  return response;
52}
53
54self.addEventListener('fetch', event => {
55  event.respondWith(FetchAndCacheIfJob(event));
56});
57