109 lines
3.3 KiB
JavaScript
109 lines
3.3 KiB
JavaScript
// Service Worker for Notes English PWA (Stage 2)
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// Strategy: Cache-first for static assets, Network-first for API calls.
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const CACHE_NAME = 'notes-v6.4';
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const OFFLINE_URL = '/';
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const PRECACHE_URLS = [
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'/',
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'/static/css/style.css',
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'/static/js/app.js',
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'/static/js/modules/api.js',
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'/static/js/modules/ui.js',
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'/static/js/modules/dictionary.js',
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'/static/js/modules/srs.js',
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'/static/js/modules/reader.js',
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'/static/js/modules/cefr.js',
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'/static/js/modules/grammar.js',
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'/manifest.json',
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];
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// -----------------------------------------------------------------------
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// Install: pre-cache core assets
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// -----------------------------------------------------------------------
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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_URLS);
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}).then(() => self.skipWaiting())
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);
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});
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// -----------------------------------------------------------------------
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// Activate: delete old caches
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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((keys) => {
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return Promise.all(
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keys
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.filter((key) => key !== CACHE_NAME)
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.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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// -----------------------------------------------------------------------
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// Fetch: strategy based on request type
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// -----------------------------------------------------------------------
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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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// Skip cross-origin requests
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if (url.origin !== location.origin) return;
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// API calls → Network-first (never serve API from cache)
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if (url.pathname.startsWith('/api/')) {
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event.respondWith(
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fetch(request).catch(() => {
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return new Response(
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JSON.stringify({ error: 'Offline. Please check your connection.' }),
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{ status: 503, headers: { 'Content-Type': 'application/json' } }
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);
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})
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);
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return;
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}
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// Static assets (CSS, JS, icons) → Cache-first (with ignoreSearch)
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if (
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url.pathname.startsWith('/static/') ||
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url.pathname === '/manifest.json' ||
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url.pathname === '/sw.js'
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) {
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event.respondWith(
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caches.match(request, { ignoreSearch: true }).then((cached) => {
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return cached || fetch(request).then((response) => {
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if (response.ok) {
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const clone = response.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
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}
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return response;
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});
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})
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);
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return;
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}
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// HTML navigation (SPA root) → Network-first with offline fallback
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event.respondWith(
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fetch(request)
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.then((response) => {
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if (response.ok) {
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const clone = response.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
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}
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return response;
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})
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.catch(() => {
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return caches.match(OFFLINE_URL).then((cached) => {
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return cached || new Response('<h1>Offline</h1><p>Please check your connection.</p>', {
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headers: { 'Content-Type': 'text/html' },
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});
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});
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})
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);
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});
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