Initial commit

sw.js

@@ -0,0 +1,36 @@
+const CACHE_NAME = 'secret-message-studio-v3';
+const ASSETS = [
+  './',
+  './index.html',
+  './manifest.json',
+  './icon.svg',
+  'https://cdn.jsdelivr.net/npm/qrcode@1.5.4/build/qrcode.min.js',
+  'https://cdn.jsdelivr.net/npm/jsqr@1.4.0/dist/jsQR.min.js'
+];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => cache.addAll(ASSETS)).catch(() => undefined)
+  );
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) => Promise.all(
+      keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key))
+    ))
+  );
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (event) => {
+  if (event.request.method !== 'GET') return;
+  event.respondWith(
+    caches.match(event.request).then((cached) => cached || fetch(event.request).then((response) => {
+      const copy = response.clone();
+      caches.open(CACHE_NAME).then((cache) => cache.put(event.request, copy)).catch(() => undefined);
+      return response;
+    }).catch(() => caches.match('./index.html')))
+  );
+});