service worker for push notifications

worker/index.js

@@ -0,0 +1,39 @@
+'use strict'
+
+self.addEventListener('push', function (event) {
+    const data = JSON.parse(event.data.text())
+    event.waitUntil(
+        registration.showNotification(data.title, {
+            body: data.message,
+            icon: '/icons/android-chrome-192x192.png'
+        })
+    )
+})
+
+self.addEventListener('notificationclick', function (event) {
+    event.notification.close()
+    event.waitUntil(
+        clients.matchAll({ type: 'window', includeUncontrolled: true }).then(function (clientList) {
+            if (clientList.length > 0) {
+                let client = clientList[0]
+                for (let i = 0; i < clientList.length; i++) {
+                    if (clientList[i].focused) {
+                        client = clientList[i]
+                    }
+                }
+                return client.focus()
+            }
+            return clients.openWindow('/')
+        })
+    )
+})
+
+// self.addEventListener('pushsubscriptionchange', function(event) {
+//   event.waitUntil(
+//       Promise.all([
+//           Promise.resolve(event.oldSubscription ? deleteSubscription(event.oldSubscription) : true),
+//           Promise.resolve(event.newSubscription ? event.newSubscription : subscribePush(registration))
+//               .then(function(sub) { return saveSubscription(sub) })
+//       ])
+//   )
+// })