103 lines
3.1 KiB
JavaScript
103 lines
3.1 KiB
JavaScript
const CACHE_NAME = 'mc-cache-v6';
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const PRECACHE_ASSETS = [
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'/',
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'/index.html',
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'/manifest.json',
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'/favicon.svg',
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];
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// Domains that should NEVER be cached or block offline usage (e.g. ad networks)
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const IGNORE_HOSTS = [
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'media.ethicalads.io',
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'server.ethicalads.io',
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'pagead2.googlesyndication.com',
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'googleads.g.doubleclick.net',
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];
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// Install: Pre-cache shell assets
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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(PRECACHE_ASSETS);
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}).then(() => self.skipWaiting())
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);
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});
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// Activate: Clean up old versions
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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.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key))
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);
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}).then(() => self.clients.claim())
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);
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});
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// Fetch: Caching strategies
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self.addEventListener('fetch', (event) => {
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const { request } = event;
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const url = new URL(request.url);
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// Ignore non-http(s) requests or ad scripts
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if (!url.protocol.startsWith('http')) return;
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if (IGNORE_HOSTS.some((host) => url.hostname.includes(host))) {
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return; // Let standard browser network handle without intercepting
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}
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// 1. Navigation requests (HTML document): Network-first with offline fallback
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if (request.mode === 'navigate') {
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event.respondWith(
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fetch(request)
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.then((networkResponse) => {
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if (networkResponse && networkResponse.status === 200) {
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const responseClone = networkResponse.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(request, responseClone));
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}
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return networkResponse;
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})
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.catch(() => {
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return caches.match('/index.html').then((cached) => cached || caches.match('/'));
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})
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);
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return;
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}
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// 2. Static Assets (JS, CSS, SVGs, Fonts): Stale-While-Revalidate
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if (
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url.origin === self.location.origin &&
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(url.pathname.startsWith('/assets/') || url.pathname.endsWith('.svg') || url.pathname.endsWith('.json'))
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) {
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event.respondWith(
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caches.match(request).then((cachedResponse) => {
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const fetchPromise = fetch(request)
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.then((networkResponse) => {
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if (networkResponse && networkResponse.status === 200) {
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const responseClone = networkResponse.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(request, responseClone));
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}
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return networkResponse;
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})
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.catch(() => null);
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// Return cached asset immediately if available, otherwise wait for network
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return cachedResponse || fetchPromise;
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})
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);
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return;
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}
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// Default: Network with Cache Fallback
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event.respondWith(
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fetch(request)
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.then((networkResponse) => {
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if (networkResponse && networkResponse.status === 200 && request.method === 'GET') {
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const responseClone = networkResponse.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(request, responseClone));
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}
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return networkResponse;
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})
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.catch(() => caches.match(request))
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);
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});
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