David Fencl
67 lines
1.8 KiB
JavaScript
67 lines
1.8 KiB
JavaScript
const CACHE_NAME = 'hladinator-v1';
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const ASSETS_TO_CACHE = [
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'/',
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'/index.html',
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'/favicon.png',
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'/manifest.json'
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];
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self.addEventListener('install', (event) => {
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event.waitUntil(
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caches.open(CACHE_NAME).then((cache) => {
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return cache.addAll(ASSETS_TO_CACHE);
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})
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);
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self.skipWaiting();
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});
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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caches.keys().then((keys) => {
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return Promise.all(
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keys.map((key) => {
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if (key !== CACHE_NAME) {
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return caches.delete(key);
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}
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})
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);
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})
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);
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self.clients.claim();
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});
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self.addEventListener('fetch', (event) => {
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// Only handle same-origin HTTP/HTTPS requests
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if (!event.request.url.startsWith(self.location.origin)) return;
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event.respondWith(
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caches.match(event.request).then((cachedResponse) => {
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if (cachedResponse) {
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// Fetch new version in background to update cache (stale-while-revalidate)
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fetch(event.request).then((networkResponse) => {
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if (networkResponse.status === 200) {
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caches.open(CACHE_NAME).then((cache) => cache.put(event.request, networkResponse));
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}
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}).catch(() => {/* ignore network failures */});
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return cachedResponse;
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}
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return fetch(event.request).then((networkResponse) => {
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// Cache static files and JSON data on the fly
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if (networkResponse.status === 200 && (
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event.request.url.includes('.json') ||
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event.request.url.includes('.css') ||
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event.request.url.includes('.js')
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)) {
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const responseToCache = networkResponse.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(event.request, responseToCache));
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}
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return networkResponse;
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}).catch(() => {
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// Offline fallback
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});
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})
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);
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});
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