98 lines
3.5 KiB
JavaScript
98 lines
3.5 KiB
JavaScript
const HTMLToCache = '/';
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const version = 'MSW V0.3';
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self.addEventListener('install', (event) => {
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event.waitUntil(caches.open(version).then((cache) => {
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cache.add(HTMLToCache).then(self.skipWaiting());
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}));
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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(cacheNames => Promise.all(cacheNames.map((cacheName) => {
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if (version !== cacheName) return caches.delete(cacheName);
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}))).then(self.clients.claim())
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);
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});
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self.addEventListener('fetch', (event) => {
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// only processes http:// & https:// requests, prevents chrome-extention:// errors
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if (event.request.url.startsWith('http')){
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const requestToFetch = event.request.clone();
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event.respondWith(
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caches.match(event.request.clone()).then((cached) => {
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// We don't return cached HTML (except if fetch failed)
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if (cached) {
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const resourceType = cached.headers.get('content-type');
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// We only return non css/js/html cached response e.g images
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if (!hasHash(event.request.url) && !/text\/html/.test(resourceType)) {
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return cached;
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}
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// If the CSS/JS didn't change since it's been cached, return the cached version
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if (hasHash(event.request.url) && hasSameHash(event.request.url, cached.url)) {
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return cached;
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}
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}
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return fetch(requestToFetch).then((response) => {
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const clonedResponse = response.clone();
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const contentType = clonedResponse.headers.get('content-type');
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if (!clonedResponse || clonedResponse.status !== 200 || clonedResponse.type !== 'basic'
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|| /\/sockjs\//.test(event.request.url)) {
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return response;
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}
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if (/html/.test(contentType)) {
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caches.open(version).then(cache => cache.put(HTMLToCache, clonedResponse));
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} else {
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// Delete old version of a file
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if (hasHash(event.request.url)) {
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caches.open(version).then(cache => cache.keys().then(keys => keys.forEach((asset) => {
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if (new RegExp(removeHash(event.request.url)).test(removeHash(asset.url))) {
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cache.delete(asset);
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}
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})));
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}
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if (event.request.method !== 'POST') {
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caches.open(version).then(cache => cache.put(event.request, clonedResponse));
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}
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}
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return response;
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}).catch(() => {
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if (hasHash(event.request.url)) return caches.match(event.request.url);
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// If the request URL hasn't been served from cache and isn't sockjs we suppose it's HTML
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else if (!/\/sockjs\//.test(event.request.url)) return caches.match(HTMLToCache);
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// Only for sockjs
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return new Response('No connection to the server', {
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status: 503,
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statusText: 'No connection to the server',
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headers: new Headers({ 'Content-Type': 'text/plain' }),
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});
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});
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})
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);
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}
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});
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function removeHash(element) {
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if (typeof element === 'string') return element.split('?hash=')[0];
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}
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function hasHash(element) {
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if (typeof element === 'string') return /\?hash=.*/.test(element);
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}
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function hasSameHash(firstUrl, secondUrl) {
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if (typeof firstUrl === 'string' && typeof secondUrl === 'string') {
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return /\?hash=(.*)/.exec(firstUrl)[1] === /\?hash=(.*)/.exec(secondUrl)[1];
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}
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}
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// Service worker created by Ilan Schemoul alias NitroBAY as a specific Service Worker for Meteor
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// Please see https://github.com/NitroBAY/meteor-service-worker for the official project source
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