91 lines
2.6 KiB
JavaScript
91 lines
2.6 KiB
JavaScript
const currentVersion = 'v1';
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const addResourcesToCache = async (resources) => {
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const cache = await caches.open(currentVersion);
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await cache.addAll(resources);
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};
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const putInCache = async (request, response) => {
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const cache = await caches.open(currentVersion);
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await cache.put(request, response);
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};
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const cacheFirst = async ({ request, preloadResponsePromise }) => {
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// First try to get the resource from the cache
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const responseFromCache = await caches.match(request);
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if (responseFromCache) {
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return responseFromCache;
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}
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// Next try to use the preloaded response, if it's there
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const preloadResponse = await preloadResponsePromise;
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if (preloadResponse) {
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console.info('using preload response', preloadResponse);
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putInCache(request, preloadResponse.clone());
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return preloadResponse;
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}
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// Next try to get the resource from the network
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try {
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const responseFromNetwork = await fetch(request);
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// response may be used only once
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// we need to save clone to put one copy in cache
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// and serve second one
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putInCache(request, responseFromNetwork.clone());
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return responseFromNetwork;
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} catch (error) {
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return new Response('Network error happened', {
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status: 408,
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headers: { 'Content-Type': 'text/plain' },
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});
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}
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};
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const deleteCache = async key => {
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await caches.delete(key)
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}
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const deleteOldCaches = async () => {
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const cacheKeepList = [currentVersion];
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const keyList = await caches.keys()
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const cachesToDelete = keyList.filter(key => !cacheKeepList.includes(key))
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await Promise.all(cachesToDelete.map(deleteCache));
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}
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self.addEventListener('activate', (event) => {
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event.waitUntil(deleteOldCaches());
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});
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const enableNavigationPreload = async () => {
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if (self.registration.navigationPreload) {
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// Enable navigation preloads!
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await self.registration.navigationPreload.enable();
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}
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};
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self.addEventListener('activate', (event) => {
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event.waitUntil(enableNavigationPreload());
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});
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self.addEventListener('install', (event) => {
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event.waitUntil(
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addResourcesToCache([
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'./heonian-resources/wordlist.json',
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'./heonian-ime/ime.js',
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'./font.otf',
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'./index.html',
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'./main.css',
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'./main.js',
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'./manifest.json'
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])
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);
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});
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self.addEventListener('fetch', (event) => {
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event.respondWith(
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cacheFirst({
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request: event.request,
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preloadResponsePromise: event.preloadResponse
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})
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);
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}); |