@koush/push-receiver

push-receiver

A library to subscribe to GCM/FCM and receive notifications within a node process.

For Electron, you can use electron-push-receiver instead which provides a convenient wrapper.

See this blog post for more details.

When should I use push-receiver ?

• I want to receive push notifications sent using Firebase Cloud Messaging in an electron desktop application.
• I want to communicate with a node process/server using Firebase Cloud Messaging infrastructure.

When should I not use push-receiver ?

• I want to send push notifications (use the firebase SDK instead)
• My application is running on a FCM supported platform (Android, iOS, Web).

Install

npm i -S @eneris/push-receiver

Requirements

• Node v16 (async/await/randomUUID support)
• Firebase sender id to receive notification
• Firebase serverKey to send notification (optional)

Usage

ClientConfig

interface ClientConfig {
    credentials?: Credentials // Will be generated if missing - save this after first use!
    persistentIds?: PersistentId[] // Default - []
    senderId: string // Required
    bundleId?: string // Default - 'receiver.push.com'
    chromeId?: string // Default - 'org.chromium.linux'
    chromeVersion?: string // Default - '94.0.4606.51'
    skipFcmRegistration?: boolean // Default - false
    logLevel?: keyof typeof LogLevels // 'NONE'|'DEBUG'|'VERBOSE' - default: 'NONE'
    vapidKey?: string // Default - default firebase VAPID key
    heartbeatIntervalMs?: number // Default - 5 * 60 * 1000
}

Node example

import { PushReceiver } from '@eneris/push-receiver'
import { argv as parsedArgs } from 'yargs'

if (!parsedArgs.senderId) {
    console.error('Missing senderId')
    return
}

(async () => {
    const instance = new PushReceiver({
        logLevel: parsedArgs.logLevel || 'DEBUG',
        senderId: parsedArgs.senderId,
        persistentIds: [], // Recover stored ids of all previous notifications
    })

    const stopListeningToCredentials = instance.onCredentialsChanged(({ oldCredentials, newCredentials }) => {
        console.log('Client generated new credentials.', newCredentials)
        // Save them somewhere! And decide if thing are needed to re-subscribe
    })

    const stopListeningToNotifications = instance.onNotification(notification => {
        // Do someting with the notification
        console.log('Notification received', notification)
    })

    await instance.connect()

    if (parsedArgs.serverId) {
        await instance.testMessage(parsedArgs.serverId)
    }

    stopListeningToCredentials()
    stopListeningToNotifications()
    instance.destroy()
})()