Web push notifications

Re: #931

config.sample.json

@@ -2,7 +2,8 @@
   "client": {
     "name": "Sample of a functional Orbit",
     "logo": "https://cdn.startinblox.com/logos/webp/startinblox.webp",
-    "server": "http://localhost:8000"
+    "server": "http://localhost:8000",
+    "vapid_key": "BFZaZjfjx9RlH6v8AEmhMeJobFYm3gOJK4DvroHLE3Wc3sd66SEgGc6rp6hLvesFpfELjHI7MjOCnbth-sBnwf4"
   },
   "components": [{
       "type": "registering",

src/libs/sw-toolbox.js

@@ -39,6 +39,63 @@ import(`https://storage.googleapis.com/workbox-cdn/releases/6.1.5/workbox-window
       wb.addEventListener('externalwaiting', showSkipWaitingPrompt);
 
       wb.register().then((r) => registration = r);
+
+      function urlB64ToUint8Array(base64String) {
+          const padding = '='.repeat((4 - base64String.length % 4) % 4);
+          const base64 = (base64String + padding)
+              .replace(/\-/g, '+')
+              .replace(/_/g, '/');
+
+          const rawData = window.atob(base64);
+          const outputArray = new Uint8Array(rawData.length);
+          const outputData = outputArray.map((output, index) => rawData.charCodeAt(index));
+
+          return outputData;
+      }
+
+      const subscribe = async (reg) => {
+          const subscription = await reg.pushManager.getSubscription();
+          if (subscription) {
+              sendSubData(subscription);
+              return;
+          }
+
+          const options = {
+              userVisibleOnly: true,
+              // if key exists, create applicationServerKey property
+              ...(orbit.client.vapid_key && {applicationServerKey: urlB64ToUint8Array(orbit.client.vapid_key)})
+          };
+
+          const sub = await reg.pushManager.subscribe(options);
+          sendSubData(sub)
+      };
+      const sendSubData = async (subscription) => {
+          const browser = navigator.userAgent.match(/(firefox|msie|chrome|safari|trident)/ig)[0].toLowerCase();
+          const data = {
+              status_type: 'subscribe',
+              subscription: subscription.toJSON(),
+              browser: browser,
+          };
+
+          const res = await fetch(orbit.client.server + "/webpush/save_information", {
+              method: 'POST',
+              body: JSON.stringify(data),
+              headers: {
+                  'content-type': 'application/json'
+              },
+              credentials: "include"
+          });
+
+          handleResponse(res);
+      };
+
+      const handleResponse = (res) => {
+          console.log(res.status);
+      };
+
+      navigator.serviceWorker.getRegistration().then(function(reg) {
+        subscribe(reg);
+      });
     });
   }
 });

src/service-worker.js

@@ -2,6 +2,26 @@ importScripts('https://storage.googleapis.com/workbox-cdn/releases/6.1.5/workbox
 
 workbox.precaching.precacheAndRoute([]);
 
+addEventListener('push', function (event) {
+    // Retrieve the textual payload from event.data (a PushMessageData object).
+    // Other formats are supported (ArrayBuffer, Blob, JSON), check out the documentation
+    // on https://developer.mozilla.org/en-US/docs/Web/API/PushMessageData.
+    const eventInfo = event.data.text();
+    const data = JSON.parse(eventInfo);
+    const head = data.head || 'New Notification 🕺🕺';
+    const body = data.body || 'This is default content. Your notification didn\'t have one 🙄🙄';
+    
+    console.log('hello from sw.js: push');
+
+    // Keep the service worker alive until the notification is created.
+    event.waitUntil(
+        self.registration.showNotification(head, {
+            body: body,
+            icon: 'https://i.imgur.com/MZM3K5w.png'
+        })
+    );
+});
+
 addEventListener('message', (event) => {
   if (event.data && event.data.type === 'SKIP_WAITING') {
     skipWaiting();