86 lines
3 KiB
TypeScript
86 lines
3 KiB
TypeScript
const version = "0.0.8"
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interface ServiceWorkerFetchEvent extends Event {
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request: RequestInfo & {url: string},
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respondWith: ((response: any | PromiseLike<Response>) => Promise<void>)
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}
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async function install() {
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console.log("Installing service worker!")
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// const cache = await caches.open(version);
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// console.log("Manifest file", manifest)
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// await cache.addAll(manifest);
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/* await cache.add({
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cache: "force-cache",
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url: "http://4.bp.blogspot.com/-_vTDmo_fSTw/T3YTV0AfGiI/AAAAAAAAAX4/Zjh2HaoU5Zo/s1600/beautiful%2Bkitten.jpg",
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destination: "image",
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})//*/
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}
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addEventListener('install', e => (<any>e).waitUntil(install()));
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addEventListener('activate', e => (<any>e).waitUntil(activate()));
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async function activate() {
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console.log("Activating service worker")
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/*self.registration.showNotification("SW started", {
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actions: [{
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action: "OK",
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title: "Some action"
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}]
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})*/
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caches.keys().then(keys => {
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// Remove all old caches
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Promise.all(
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keys.map(key => key !== version && caches.delete(key))
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);
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}).catch(console.error)
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}
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const cacheFirst = (event) => {
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event.respondWith(
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caches.match(event.request, {ignoreSearch: true}).then((cacheResponse) => {
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if(cacheResponse !== undefined){
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console.log("Loaded from cache: ", event.request)
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return cacheResponse
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}
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return fetch(event.request).then((networkResponse) => {
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return caches.open(version).then((cache) => {
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cache.put(event.request, networkResponse.clone());
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console.log("Cached", event.request)
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return networkResponse;
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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',
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e => {
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// Important: this lambda must run synchronously, as the browser will otherwise handle the request
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const event = <ServiceWorkerFetchEvent> e;
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try {
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const origin = new URL(self.origin)
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const requestUrl = new URL(event.request.url)
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if (requestUrl.pathname.endsWith("service-worker-version")) {
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console.log("Sending version number...")
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event.respondWith(new Response(JSON.stringify({"service-worker-version": version})));
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return
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}
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const shouldBeCached = origin.host === requestUrl.host && origin.host !== "127.0.0.1:1234"
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if (!shouldBeCached) {
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console.log("Not intercepting ", requestUrl.toString(), origin.host, requestUrl.host)
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// We return _without_ calling event.respondWith, which signals the browser that it'll have to handle it himself
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return
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}
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cacheFirst(event)
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} catch (e) {
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console.error("CRASH IN SW:", e)
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event.respondWith(fetch(event.request.url));
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}
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});
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