up

service-worker.js

@@ -0,0 +1,43 @@
+const CACHE_NAME = 'whatsapp-static-v1';
+const OFFLINE_URL = '/index.php';
+const ASSETS_TO_CACHE = [
+  OFFLINE_URL,
+  '/assets/css/styles.css',
+  '/assets/js/app_simple.js',
+  '/manifest.json'
+];
+
+self.addEventListener('install', (event) => {
+  self.skipWaiting();
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => cache.addAll(ASSETS_TO_CACHE))
+  );
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then(keys => Promise.all(
+      keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k))
+    ))
+  );
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (event) => {
+  if (event.request.method !== 'GET') return;
+  event.respondWith(
+    caches.match(event.request).then(cached => {
+      if (cached) return cached;
+      return fetch(event.request).then(resp => {
+        // cache same-origin GET responses
+        try {
+          if (resp && resp.status === 200 && resp.type === 'basic') {
+            const clone = resp.clone();
+            caches.open(CACHE_NAME).then(cache => cache.put(event.request, clone));
+          }
+        } catch (e) {}
+        return resp;
+      }).catch(() => caches.match(OFFLINE_URL));
+    })
+  );
+});