go-fcm-receiver

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go-fcm-receiver

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A library to subscribe to a GCM/FCM (Firebase Cloud Messaging) sender using protobuf

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# go-fcm-receiver

A library to subscribe to a GCM/FCM (Firebase Cloud Messaging) sender using [protobuf](https://developers.google.com/protocol-buffers).

The library was inspired by [push-receiver](https://www.npmjs.com/package/push-receiver) and by [this blog post](https://medium.com/@MatthieuLemoine/my-journey-to-bring-web-push-support-to-node-and-electron-ce70eea1c0b0).

## The difference between this library and other libraries

- This library receives FCM notifications the same way an Android device does. This library is an FCM client.
- Other libraries (such as go-fcm) sends notifications via fcm, and does not receive notifications. Those libraries are an FCM server-side.

## API Deprecation
New version is now avaliable using the new FCM API! (as of June 2024)
> [!CAUTION]
> Breaking changes - Instead of creating an `FCMClient` object with a `SenderId`, you now must provide `AppId`, `ApiKey`, and a `ProjectID`. See the updated usage example below.
> > Google deprecated https://fcm.googleapis.com/fcm/connect/subscribe (/send too), which is slated for full removal on June 21, 2024. (Source: https://firebase.google.com/docs/cloud-messaging/migrate-v1)

## Install

`
import "github.com/morhaviv/go-fcm-receiver"
`

## Requirements

- Firebase sender id to receive notification

## Usage

### Creating a new device and listening
```Go
package main

import (
	go_fcm_receiver "github.com/morhaviv/go-fcm-receiver"
)

func main() {
	newDevice := go_fcm_receiver.FCMClient{
		ApiKey:    "<39_CHARACTERS_API_TOKEN>",
		AppId:     "1:123445679012:android:0123456789abcdef",
		ProjectID: "<PROJECT_ID>",
		OnDataMessage: func(message []byte) {
			fmt.Println("Received a message:", string(message))
		},
	}
	privateKey, authSecret, err := newDevice.CreateNewKeys()
	if err != nil {
		panic(err)
	}
	fcmToken, gcmToken, androidId, securityToken, err := newDevice.Register()
	if err != nil {
		panic(err)
	}
	SaveDeviceDetails(fcmToken, gcmToken, androidId, securityToken, privateKey, authSecret)
	err = newDevice.StartListening()
	if err != nil {
		panic(err)
	}

}
```

### Listening an existing device
```Go
package main

import (
	go_fcm_receiver "github.com/morhaviv/go-fcm-receiver"
)

func main() {
	oldDevice := go_fcm_receiver.FCMClient{
		GcmToken:          "<GCM_TOKEN>",
		FcmToken:          "<FCM_TOKEN>",
		AndroidId:         5240887932061714513, // The androidId returned when the device was created
		SecurityToken:     69534515778185919, // The securityToken returned when the device was created
		OnDataMessage: func(message []byte) {
			fmt.Println("Received a message:", string(message))
		},
	}
	
	err := oldDevice.LoadKeys("<PRIVATE_KEY_BASE64>", "<AUTH_SECRET_BASE64>")
	if err != nil {
		panic(err)
	}
	
	err = oldDevice.StartListening()
	if err != nil {
		panic(err)
	}
}
```

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