Resetting the Push Receiver feature

README.md

@@ -47,6 +47,22 @@ ipcRenderer.on(ON_NOTIFICATION_RECEIVED, (_, notification) => // display notific
 ipcRenderer.send(START_NOTIFICATION_SERVICE, senderId);
 ```
 
+## Resetting the Push Receiver
+
+There are cases where you may need to reset the push receiver to a state where it retrieves a new notification token from FCM. For instance, if your app is designed to support a sign-in screen and you only want push notifications for the person who signs in, you will need to have the push receiver delete the notification token when a different person signs in, otherwise the new sign-in may receive notifications that are only private to the person who signed in previously.
+
+- In renderer process :
+
+```javascript
+import { ipcRenderer } from 'electron';
+import {
+  DESTROY_NOTIFICATION_SERVICE
+} from 'electron-push-receiver/src/constants';
+
+// You can invoke it on user logout
+ipcRenderer.send(DESTROY_NOTIFICATION_SERVICE);
+```
+
 ## Example
 
 Thanks to [CydeSwype](https://github.com/CydeSwype), you can find an example project [here](https://github.com/CydeSwype/electron-fcm-demo).

src/constants/index.js

@@ -1,6 +1,8 @@
 module.exports = {
   // Event to be sent from renderer process to trigger service start
   START_NOTIFICATION_SERVICE: 'PUSH_RECEIVER:::START_NOTIFICATION_SERVICE',
+  // Event to be sent from renderer process to trigger service destroy
+  DESTROY_NOTIFICATION_SERVICE: 'PUSH_RECEIVER:::DESTROY_NOTIFICATION_SERVICE',
   // Event sent to the renderer process once the service is up
   NOTIFICATION_SERVICE_STARTED: 'PUSH_RECEIVER:::NOTIFICATION_SERVICE_STARTED',
   // Event sent to the renderer process if an error has occured during the starting process

src/electron-push-receiver.d.ts

@@ -1,5 +1,6 @@
 interface ElectronPushReceiver {
     START_NOTIFICATION_SERVICE: string;
+    DESTROY_NOTIFICATION_SERVICE: string;
     NOTIFICATION_SERVICE_STARTED: string;
     NOTIFICATION_SERVICE_ERROR: string;
     NOTIFICATION_RECEIVED: string;
@@ -8,4 +9,4 @@ interface ElectronPushReceiver {
 }
 
 declare const electronPushReceiver: ElectronPushReceiver;
-export = electronPushReceiver;
+export = electronPushReceiver;

src/index.js

@@ -3,6 +3,7 @@ const { ipcMain } = require('electron');
 const Config = require('electron-config');
 const {
   START_NOTIFICATION_SERVICE,
+  DESTROY_NOTIFICATION_SERVICE,
   NOTIFICATION_SERVICE_STARTED,
   NOTIFICATION_SERVICE_ERROR,
   NOTIFICATION_RECEIVED,
@@ -13,6 +14,7 @@ const config = new Config();
 
 module.exports = {
   START_NOTIFICATION_SERVICE,
+  DESTROY_NOTIFICATION_SERVICE,
   NOTIFICATION_SERVICE_STARTED,
   NOTIFICATION_SERVICE_ERROR,
   NOTIFICATION_RECEIVED,
@@ -23,6 +25,8 @@ module.exports = {
 // To be sure that start is called only once
 let started = false;
 
+//  used as a ref to client instance
+let client;
 // To be call from the main process
 function setup(webContents) {
   // Will be called by the renderer process
@@ -50,7 +54,10 @@ function setup(webContents) {
         webContents.send(TOKEN_UPDATED, credentials.fcm.token);
       }
       // Listen for GCM/FCM notifications
-      await listen(Object.assign({}, credentials, { persistentIds }), onNotification(webContents));
+      client = await listen(
+        Object.assign({}, credentials, { persistentIds }),
+        onNotification(webContents),
+      );
       // Notify the renderer process that we are listening for notifications
       webContents.send(NOTIFICATION_SERVICE_STARTED, credentials.fcm.token);
     } catch (e) {
@@ -59,6 +66,18 @@ function setup(webContents) {
       webContents.send(NOTIFICATION_SERVICE_ERROR, e.message);
     }
   });
+
+  ipcMain.on(DESTROY_NOTIFICATION_SERVICE, () => {
+    // destroy push notifications service
+    if (client !== undefined) {
+      client.destroy();
+    }
+    // clear cache
+    config.set('credentials', null);
+    config.set('senderId', null);
+    config.set('persistentIds', null);
+    started = false;
+  });
 }
 
 // Will be called on new notification