78 lines
2.1 KiB
JavaScript
78 lines
2.1 KiB
JavaScript
/**
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* RVF Seed Decoder - Service Worker
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*
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* Cache-first strategy for static assets and the WASM binary.
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* Falls back to network on cache miss, then caches the response.
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*/
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const CACHE_NAME = 'rvf-pwa-v1';
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const STATIC_ASSETS = [
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'./',
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'./index.html',
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'./app.js',
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'./style.css',
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'./manifest.json',
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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(STATIC_ASSETS);
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})
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);
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self.skipWaiting();
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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((names) => {
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return Promise.all(
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names
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.filter((name) => name !== CACHE_NAME)
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.map((name) => caches.delete(name))
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);
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})
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);
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self.clients.claim();
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});
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self.addEventListener('fetch', (event) => {
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const url = new URL(event.request.url);
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// Cache-first for same-origin static assets and WASM binaries
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if (url.origin === self.location.origin) {
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event.respondWith(
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caches.open(CACHE_NAME).then((cache) => {
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return cache.match(event.request).then((cached) => {
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if (cached) {
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return cached;
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}
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return fetch(event.request).then((response) => {
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// Cache successful GET responses
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if (response.ok && event.request.method === 'GET') {
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const isWasm = url.pathname.endsWith('.wasm');
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const isStatic =
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url.pathname.endsWith('.html') ||
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url.pathname.endsWith('.js') ||
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url.pathname.endsWith('.css') ||
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url.pathname.endsWith('.json');
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if (isWasm || isStatic) {
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cache.put(event.request, response.clone());
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}
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}
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return response;
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});
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});
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}).catch(() => {
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// Offline fallback: return cached index for navigation requests
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if (event.request.mode === 'navigate') {
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return caches.match('./index.html');
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}
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return new Response('Offline', { status: 503 });
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})
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);
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}
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});
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