Files
Dramlog-Prod/public/sw.js
robin b7ac0957d1 docs: add offline sync & PWA documentation
feat: improve PWA resilience with SWR and navigation timeouts
2025-12-20 22:52:04 +01:00

107 lines
3.3 KiB
JavaScript

const CACHE_NAME = 'whisky-vault-v3'; // Increment version to apply new strategy
const ASSETS_TO_CACHE = [
'/manifest.json',
'/icon-192.png',
'/icon-512.png',
'/favicon.ico',
];
self.addEventListener('install', (event) => {
event.waitUntil(
caches.open(CACHE_NAME).then((cache) => {
return cache.addAll(ASSETS_TO_CACHE);
})
);
});
self.addEventListener('activate', (event) => {
event.waitUntil(
caches.keys().then((cacheNames) => {
return Promise.all(
cacheNames.map((cacheName) => {
if (cacheName !== CACHE_NAME) {
return caches.delete(cacheName);
}
})
);
})
);
self.clients.claim();
});
// Helper for Network-First with Timeout
function fetchWithTimeout(request, timeoutMs = 3000) {
return new Promise((resolve, reject) => {
const timeoutId = setTimeout(() => {
reject(new Error('Network timeout'));
}, timeoutMs);
fetch(request).then(
(response) => {
clearTimeout(timeoutId);
resolve(response);
},
(err) => {
clearTimeout(timeoutId);
reject(err);
}
);
});
}
self.addEventListener('fetch', (event) => {
const url = new URL(event.request.url);
// CRITICAL: Always bypass cache for auth, api, and supabase requests
const isAuthRequest = url.pathname.includes('/auth/') ||
url.pathname.includes('/v1/auth/') ||
url.pathname.includes('/v1/token');
const isApiRequest = url.pathname.includes('/api/');
const isSupabaseRequest = url.hostname.includes('supabase.co');
if (isAuthRequest || isApiRequest || isSupabaseRequest) {
return;
}
// 1. ASSETS & APP SHELL: Stale-While-Revalidate
const isAsset = event.request.destination === 'style' ||
event.request.destination === 'script' ||
event.request.destination === 'worker' ||
event.request.destination === 'font' ||
event.request.destination === 'image' ||
url.pathname.startsWith('/_next/static');
if (isAsset) {
event.respondWith(
caches.match(event.request).then((cachedResponse) => {
const fetchPromise = fetch(event.request).then((networkResponse) => {
if (networkResponse && networkResponse.status === 200) {
const responseClone = networkResponse.clone();
caches.open(CACHE_NAME).then((cache) => {
cache.put(event.request, responseClone);
});
}
return networkResponse;
});
return cachedResponse || fetchPromise;
})
);
return;
}
// 2. NAVIGATION: Network-First with 3s Timeout
if (event.request.mode === 'navigate') {
event.respondWith(
fetchWithTimeout(event.request, 3000)
.catch(() => {
console.log('[SW] Navigation network failure or timeout, falling back to cache');
return caches.match(event.request);
})
);
return;
}
// Default: Network-Only or default fetch
return;
});