Initial JPEG photo metadata editor v0.1

app/static/service-worker.js

@@ -0,0 +1,25 @@
+const CACHE_NAME = 'photo-date-editor-v1';
+const SHELL = ['/', '/styles.css', '/app.js', '/manifest.webmanifest'];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(SHELL)));
+  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' || new URL(event.request.url).pathname.startsWith('/api/')) return;
+  event.respondWith(
+    fetch(event.request).then((response) => {
+      const copy = response.clone();
+      caches.open(CACHE_NAME).then((cache) => cache.put(event.request, copy));
+      return response;
+    }).catch(() => caches.match(event.request))
+  );
+});