Creating and sending push notifications to Chrome web by using Event Notifications

Create an Event Notifications service, add a push destination for Chrome Push Notifications, and send messages to Chrome web devices.

What is Event Notifications?

Event Notifications is an event notification routing service that informs you about critical events that occur in your IBM Cloud account or triggers automated actions by using webhooks. You can filter and route event notifications from IBM Cloud services like Availability Monitoring, to email, SMS, push notifications, and webhooks.

How do clients use Chrome web Push Notifications?

The following diagram shows you how clients use Chrome web Push Notifications.

Objectives

This tutorial shows you how to send push notifications as follows:

Create a website with Event Notifications.
Get Chrome web credentials.
Download the SDK and complete the notifications setup.
Configure and send Chrome web Push Notifications to a browser.

Before you begin

You must have the following prerequisites in place:

Download and install any code editor to create website code by using HTML, CSS, and JavaScript.
A Google account to log in to Firebase console to get your Sender ID and Server API Key.
An IBM Cloud account. If you do not have one, create an IBM Cloud account.

Create an Event Notifications service instance

Log in to your IBM Cloud account.
In the IBM Cloud catalog, search Event Notifications > Event Notifications.
Select a Region from the list of supported regions and select a pricing plan.
Provide a Service name.
Select a resource group.
Accept the licensing agreements and terms by clicking the checkbox.
Click Create.

Get FCM credentials

Firebase Cloud Messaging (FCM) is the gateway that delivers push notifications to Chrome web devices. To set up the Chrome web Push destination on the console, you must get your FCM credentials (Server key). The server key is stored securely and used by the Event Notifications service to connect to the FCM server.

Go to the Firebase Console. A Google user account is required.
Click Create a project. If you already have a project, then click Add Project.
In the Create a project window, enter a project name, accept the terms, and enable or disable Google analytics (optional) by selecting the toggle switch, then click Continue.
If Google analytics is enabled, then in the Configure Google Analytics window, choose the Analytics location, and accept the terms.
Click Create Project.
Click Continue when the new project is ready.
In the navigation panel, select the settings icon next to the Project Overview and select Settings > Project settings.
Click the Cloud Messaging tab to view your project credentials: Server Key.

Add a generic API source

To create a generic API source:

Click Sources in the Event Notifications instance.
Click Create and select an API Source in the Create source dialog.
Type a name and an optional description and click Create source.

Create an Event Notifications destination

Click Destinations in the Event Notifications instance and click Create.

Enter the following destination details in the Create destination dialog.

Name: add a name for the Destination.
Description: add an optional description for the destination.
Type: select Chrome Push Notifications type from the dropdown list.
Select a destination plan: Pre-production destination or Production destination.
- Pre-production destination - select this destination as a low-cost push destination for your development and test environments.
- Production destination - use the full capability of this destination. Unlimited devices and outbound messages allowed.
Add your website URL to allowlist it.
Add the Server Key, which you got from Get FCM credentials section.
Click Create destination.
When the Chrome destination is created, edit the destination to get the public vapID key required for the web SDK.

Destination Edit — Receive notifications

Create an Event Notifications topic

Click Topics in the Event Notifications instance and click Create. Enter the following topic and filter details in the Topic details and Event filters steps:

Name: enter a name for the topic.
Description: add an optional description for the topic.
Source: select a source from the dropdown list.
Event type: select event type from the dropdown list.
Event sub type: select event sub type from the event sub type dropdown list.
Severity: select severity from the severity dropdown list.
Advanced conditions: write your own custom conditions, which must follow jsonpath specifications. Jsonpath expressions can be validated at jsonpath.com or extendsclass.com.

Create an Event Notifications subscription

Proceed to the Subscriptions step. Click Create and enter the following subscription details in the Create subscription dialog.

Subscription name: enter a name for the subscription.
Destination type: select destination type.
Destination: select destination.

Click Create subscription.

Set up Event Notifications Chrome web SDK

The Chrome web SDK enables Chrome websites to receive push notifications. Complete the following steps to install Event Notifications Chrome web SDK, initialize the SDK, and register for notifications for your website.

To include the SDK in your project, add the ENPushSDK.js, ENPushServiceWorker.js, and manifest_Website.json files to your project root folder.
Edit the manifest_Website.json file.
```
{
   "name": "YOUR_WEBSITE_NAME"
}
```
Change the manifest_Website.json file name to manifest.json.

Include the manifest.json in the <head> tag of your HTML file.

<link rel="manifest" href="https://github.com/IBM/event-notifications-destination-webpush-sdk/blob/main/manifest_Website.json">

Include IBM Cloud web push SDK to the script.

<script src="https://github.com/IBM/event-notifications-destination-webpush-sdk/blob/main/ENPushSDK.js" async></script>

Complete the following steps to enable the website to initialize the SDK.

var enPush = new ENPush()

function callback(response) {
   alert(response.response)
}

var initParams = {
   "instanceGUID": "<instance_guid>",
   "apikey": "<instance_apikey>",
   "region": "<region>",
   "deviceId": "<YOUR_DEVICE_ID>",
   "chromeDestinationId": "<chrome_destination_id>",
   "chromeApplicationServerKey": "<Chrome_VapId_public_key>"
}

enPush.initialize(initParams, callback)

region: Region of the Event Notifications instance. For example, us-south,eu-gb, au-syd, eu-de or eu-es.
deviceId: Optional deviceId for device registration.

To register for notifications, use the register() or registerWithUserId() API to register the device with Event Notifications service. Choose either of the following options:
- Register without UserId:
```
enPush.register(function(response) {
   alert(response.response)
})
```
- Register with userId. For userId-based notification, the register method accepts one more parameter - userId.
```
enPush.registerWithUserId("UserId",function(response) {
   alert(response.response)
})
```
  UserId is the user identifier value with which you want to register devices in the push service instance.
The subscribe API subscribes the device for a tag. After the device is subscribed to a particular tag, the device can receive notifications that are sent for that tag. Add the following code snippet to your web application to subscribe to a list of tags.
```
enPush.subscribe(tagName, function(response) {
   alert(response.response)
})
```
When the setup is complete, run your application and register for push notifications.

Send notifications to the Chrome web device

Use the Send notification API to send the push notification for the Chrome web device. You can use the Node, Go, Python or Java admin SDK instead of calling the API directly.

Received notification on the Chrome website in macOS.