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added web manifest and service worker, thus making Scoold a PWA
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| /* | ||
| Copyright 2015, 2019 Google Inc. All Rights Reserved. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| // Incrementing OFFLINE_VERSION will kick off the install event and force | ||
| // previously cached resources to be updated from the network. | ||
| const OFFLINE_VERSION = 1; | ||
| const CACHE_NAME = 'offline'; | ||
| // Customize this with a different URL if needed. | ||
| const OFFLINE_URL = 'offline.html'; | ||
|
|
||
| self.addEventListener('install', (event) => { | ||
| event.waitUntil((async () => { | ||
| const cache = await caches.open(CACHE_NAME); | ||
| // Setting {cache: 'reload'} in the new request will ensure that the response | ||
| // isn't fulfilled from the HTTP cache; i.e., it will be from the network. | ||
| await cache.add(new Request(OFFLINE_URL, {cache: 'reload'})).catch(() => {}); | ||
| })()); | ||
| }); | ||
|
|
||
| self.addEventListener('activate', (event) => { | ||
| event.waitUntil((async () => { | ||
| // Enable navigation preload if it's supported. | ||
| // See https://developers.google.com/web/updates/2017/02/navigation-preload | ||
| if ('navigationPreload' in self.registration) { | ||
| await self.registration.navigationPreload.enable(); | ||
| } | ||
| })()); | ||
|
|
||
| // Tell the active service worker to take control of the page immediately. | ||
| self.clients.claim(); | ||
| }); | ||
|
|
||
| self.addEventListener('fetch', (event) => { | ||
| // We only want to call event.respondWith() if this is a navigation request | ||
| // for an HTML page. | ||
| if (event.request.mode === 'navigate') { | ||
| event.respondWith((async () => { | ||
| try { | ||
| // First, try to use the navigation preload response if it's supported. | ||
| const preloadResponse = await event.preloadResponse; | ||
| if (preloadResponse) { | ||
| return preloadResponse; | ||
| } | ||
|
|
||
| const networkResponse = await fetch(event.request); | ||
| return networkResponse; | ||
| } catch (error) { | ||
| // catch is only triggered if an exception is thrown, which is likely | ||
| // due to a network error. | ||
| // If fetch() returns a valid HTTP response with a response code in | ||
| // the 4xx or 5xx range, the catch() will NOT be called. | ||
| console.log('Fetch failed; returning offline page instead.', error); | ||
|
|
||
| const cache = await caches.open(CACHE_NAME); | ||
| const cachedResponse = await cache.match(OFFLINE_URL); | ||
| return cachedResponse; | ||
| } | ||
| })()); | ||
| } | ||
|
|
||
| // If our if() condition is false, then this fetch handler won't intercept the | ||
| // request. If there are any other fetch handlers registered, they will get a | ||
| // chance to call event.respondWith(). If no fetch handlers call | ||
| // event.respondWith(), the request will be handled by the browser as if there | ||
| // were no service worker involvement. | ||
| }); |
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