kamaji
ac241fae2e
Add /capture, /queue, /browser to SW precache so these pages work offline without needing a prior visit. Capture and queue are fully functional offline since they use local IndexedDB. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
178 lines
6.5 KiB
JavaScript
178 lines
6.5 KiB
JavaScript
// NextSnap Service Worker
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// Provides offline-first caching for the app shell
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const CACHE_VERSION = 'nextsnap-v21';
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const APP_SHELL_CACHE = 'nextsnap-shell-v17';
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const RUNTIME_CACHE = 'nextsnap-runtime-v17';
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// Offline fallback page (served when network fails and no cached version exists)
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const OFFLINE_PAGE = `<!DOCTYPE html>
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<html lang="en"><head>
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<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
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<title>Offline - NextSnap</title>
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<style>
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*{margin:0;padding:0;box-sizing:border-box}
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body{font-family:-apple-system,system-ui,sans-serif;background:#1a1a2e;color:#e0e0e0;
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display:flex;align-items:center;justify-content:center;min-height:100vh;padding:2rem;text-align:center}
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h1{font-size:1.5rem;margin-bottom:1rem;color:#fff}
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p{color:#aaa;margin-bottom:1.5rem;line-height:1.5}
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button{background:#4dabf7;color:#fff;border:none;padding:0.75rem 2rem;border-radius:8px;
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font-size:1rem;cursor:pointer;min-height:44px}
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button:active{opacity:0.8}
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</style></head><body>
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<div><h1>You're Offline</h1><p>Check your internet connection and try again.</p>
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<button onclick="location.reload()">Retry</button></div>
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</body></html>`;
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// Assets to cache on install
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const APP_SHELL_ASSETS = [
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'/',
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'/capture',
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'/queue',
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'/browser',
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'/static/css/style.css',
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'/static/js/app.js',
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'/static/js/auth.js',
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'/static/js/camera.js',
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'/static/js/storage.js',
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'/static/js/sync.js',
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'/static/js/filebrowser.js',
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'/static/lib/dexie.min.js',
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'/static/manifest.json',
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'/static/icons/icon-192.png',
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'/static/icons/icon-512.png'
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];
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// Install event - precache app shell
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self.addEventListener('install', (event) => {
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console.log('[SW] Installing service worker...');
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event.waitUntil(
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caches.open(APP_SHELL_CACHE)
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.then((cache) => {
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console.log('[SW] Caching app shell');
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return cache.addAll(APP_SHELL_ASSETS);
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})
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.then(() => {
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console.log('[SW] App shell cached successfully');
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return self.skipWaiting(); // Activate immediately
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})
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.catch((error) => {
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console.error('[SW] Failed to cache app shell:', error);
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})
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);
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});
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// Activate event - clean up old caches
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self.addEventListener('activate', (event) => {
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console.log('[SW] Activating service worker...');
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event.waitUntil(
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caches.keys()
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.then((cacheNames) => {
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return Promise.all(
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cacheNames.map((cacheName) => {
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if (cacheName !== APP_SHELL_CACHE && cacheName !== RUNTIME_CACHE) {
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console.log('[SW] Deleting old cache:', cacheName);
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return caches.delete(cacheName);
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}
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})
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);
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})
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.then(() => {
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console.log('[SW] Service worker activated');
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return self.clients.claim(); // Take control immediately
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})
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);
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});
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// Fetch event - route requests to appropriate caching strategy
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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 non-GET requests (uploads, form posts, etc.)
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if (request.method !== 'GET') {
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return;
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}
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// Static assets (/static/) - cache-first (versioned via SW cache bump)
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if (url.pathname.startsWith('/static/')) {
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event.respondWith(
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caches.match(request)
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.then((cachedResponse) => {
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if (cachedResponse) {
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return cachedResponse;
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}
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return fetch(request)
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.then((response) => {
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if (!response || response.status !== 200) {
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return response;
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}
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const responseClone = response.clone();
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caches.open(APP_SHELL_CACHE).then((cache) => {
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cache.put(request, responseClone);
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});
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return response;
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})
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.catch(() => new Response('Offline', { status: 503 }));
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})
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);
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return;
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}
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// Everything else (pages, API) - network-first with cache fallback
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event.respondWith(
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fetch(request)
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.then((response) => {
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// Cache successful GET responses for offline fallback
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if (response.status === 200) {
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const responseClone = response.clone();
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caches.open(RUNTIME_CACHE).then((cache) => {
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// Don't cache file uploads or large binary responses
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if (!url.pathname.includes('/upload') &&
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!url.pathname.includes('/thumbnail')) {
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cache.put(request, responseClone);
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}
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});
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}
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return response;
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})
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.catch(() => {
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// Network failed - try cache
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return caches.match(request)
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.then((cachedResponse) => {
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if (cachedResponse) {
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return cachedResponse;
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}
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// No cache - return offline response
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if (url.pathname.startsWith('/api/')) {
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return new Response(
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JSON.stringify({ error: 'offline', message: 'You are offline.' }),
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{ status: 503, headers: { 'Content-Type': 'application/json' } }
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);
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}
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return new Response(OFFLINE_PAGE, {
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status: 200,
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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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// Listen for messages from clients
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self.addEventListener('message', (event) => {
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if (event.data && event.data.type === 'SKIP_WAITING') {
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self.skipWaiting();
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}
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if (event.data && event.data.type === 'CLEAR_CACHE') {
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event.waitUntil(
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caches.keys().then((cacheNames) => {
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return Promise.all(
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cacheNames.map((cacheName) => caches.delete(cacheName))
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);
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})
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);
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}
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});
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