52 lines
1.2 KiB
JavaScript
52 lines
1.2 KiB
JavaScript
importScripts("https://js.pusher.com/beams/service-worker.js");
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// offline static page handler
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// @crgd
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const CACHE_NAME = "offlineCache-v1";
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const OFFLINE_URL = "/assets/offline.html";
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self.addEventListener("install", (event) => {
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const cacheOfflinePage = async () => {
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const cache = await caches.open(CACHE_NAME);
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await cache.add(new Request(OFFLINE_URL, {cache: "reload"}));
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};
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cacheOfflinePage().then(() => {
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this.skipWaiting();
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});
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});
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self.addEventListener("activate", (event) => {
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const expectedCaches = [CACHE_NAME];
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event.waitUntil(
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caches.keys().then(keys => Promise.all(
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keys.map(key => {
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if (!expectedCaches.includes(key)) {
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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.addEventListener("fetch", (event) => {
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if (event.request.mode === "navigate") {
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event.respondWith((async () => {
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try {
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const preloadResponse = await event.preloadResponse;
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if (preloadResponse) return preloadResponse;
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const networkResponse = await fetch(event.request);
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return networkResponse;
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} catch (error) {
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console.log("Fetch failed; returning offline page instead.", error);
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const cachedResponse = await caches.match(OFFLINE_URL);
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return cachedResponse;
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}
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})());
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}
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});
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