node-gcm

node-gcm

node-gcm is a Node.JS library for Google Cloud Messaging.

Installation

$ npm install node-gcm

Requirements

This library provides the server-side implementation of GCM. You need to generate an API key (Sender ID).

GCM notifications can be sent to both Android and iOS. If you are new to GCM you should probably look into the documentation.

Example application

According to below Usage reference, we could create such application:

var gcm = require('node-gcm');

var message = new gcm.Message();

message.addData('key1', 'msg1');

var regTokens = ['YOUR_REG_TOKEN_HERE'];

// Set up the sender with you API key
var sender = new gcm.Sender('YOUR_API_KEY_HERE');

// Now the sender can be used to send messages
sender.send(message, { registrationTokens: regTokens }, function (err, response) {
	if(err) console.error(err);
	else 	console.log(response);
});

// Send to a topic, with no retry this time
sender.sendNoRetry(message, { topic: '/topics/global' }, function (err, response) {
	if(err) console.error(err);
	else 	console.log(response);
});

Usage

var gcm = require('node-gcm');

// Create a message
// ... with default values
var message = new gcm.Message();

// ... or some given values
var message = new gcm.Message({
	collapseKey: 'demo',
	priority: 'high',
	contentAvailable: true,
	delayWhileIdle: true,
	timeToLive: 3,
	restrictedPackageName: "somePackageName",
	dryRun: true,
	data: {
		key1: 'message1',
		key2: 'message2'
	},
	notification: {
		title: "Hello, World",
		icon: "ic_launcher",
		body: "This is a notification that will be displayed ASAP."
	}
});

// Change the message data
// ... as key-value
message.addData('key1','message1');
message.addData('key2','message2');

// ... or as a data object (overwrites previous data object)
message.addData({
	key1: 'message1',
	key2: 'message2'
});

// Set up the sender with you API key
var sender = new gcm.Sender('insert Google Server API Key here');

// Add the registration tokens of the devices you want to send to
var registrationTokens = [];
registrationTokens.push('regToken1');
registrationTokens.push('regToken2');

// Send the message
// ... trying only once
sender.sendNoRetry(message, { registrationTokens: registrationTokens }, function(err, response) {
  if(err) console.error(err);
  else    console.log(response);
});

// ... or retrying
sender.send(message, { registrationTokens: registrationTokens }, function (err, response) {
  if(err) console.error(err);
  else    console.log(response);
});

// ... or retrying a specific number of times (10)
sender.send(message, { registrationTokens: registrationTokens }, 10, function (err, response) {
  if(err) console.error(err);
  else    console.log(response);
});

Recipients

You can send push notifications to various recipient types by providing one of the following recipient keys:

Key	Type	Description
to	String	A single registration token, notification key, or topic.
topic	String	A single publish/subscribe topic.
notificationKey	String	Deprecated. A key that groups multiple registration tokens linked to the same user.
registrationIds	String[]	Deprecated. Use registrationTokens instead.
registrationTokens	String[]	A list of registration tokens. Must contain at least 1 and at most 1000 registration tokens.

If you provide an incorrect recipient key or object type, an Error object will be returned to your callback.

Notice that you can at most send notifications to 1000 registration tokens at a time. This is due to a restriction on the side of the GCM API.

Notification usage

var message = new gcm.Message();

// Add notification payload as key value
message.addNotification('title', 'Alert!!!');
message.addNotification('body', 'Abnormal data access');
message.addNotification('icon', 'ic_launcher');

// as object
message.addNotification({
  title: 'Alert!!!',
  body: 'Abnormal data access',
  icon: 'ic_launcher'
});

Notification payload option table

Parameter	Platform	Usage	Description
title	Android, iOS (Watch)	Required (Android), Optional (iOS), string	Indicates notification title. This field is not visible on iOS phones and tablets.
body	Android, iOS	Optional, string	Indicates notification body text.
icon	Android	Required, string	Indicates notification icon. On Android: sets value to myicon for drawable resource myicon.png.
sound	Android, iOS	Optional, string	Indicates sound to be played. Supports only default currently.
badge	iOS	Optional, string	Indicates the badge on client app home icon.
tag	Android	Optional, string	Indicates whether each notification message results in a new entry on the notification center on Android. If not set, each request creates a new notification. If set, and a notification with the same tag is already being shown, the new notification replaces the existing one in notification center.
color	Android	Optional, string	Indicates color of the icon, expressed in #rrggbb format
click_action	Android, iOS	Optional, string	The action associated with a user click on the notification. On Android, if this is set, an activity with a matching intent filter is launched when user clicks the notification. For example, if one of your Activities includes the intent filter: (Appendix:1)Set click_action to OPEN_ACTIVITY_1 to open it. If set, corresponds to category in APNS payload.
body_loc_key	iOS	Optional, string	Indicates the key to the body string for localization. On iOS, this corresponds to "loc-key" in APNS payload.
body_loc_args	iOS	Optional, JSON array as string	Indicates the string value to replace format specifiers in body string for localization. On iOS, this corresponds to "loc-args" in APNS payload.
title_loc_args	iOS	Optional, JSON array as string	Indicates the string value to replace format specifiers in title string for localization. On iOS, this corresponds to "title-loc-args" in APNS payload.
title_loc_key	iOS	Optional, string	Indicates the key to the title string for localization. On iOS, this corresponds to "title-loc-key" in APNS payload.

Notice notification payload defined in GCM Connection Server Reference

Custom GCM request options

You can provide custom request options such as proxy and timeout for the GCM request. For more information, refer to the complete list of request options. Note that the following options cannot be overriden: method, uri, body, as well as the following headers: Authorization, Content-Type, and Content-Length.

// Set custom request options
var requestOptions = {
	proxy: 'http://127.0.0.1:8888',
	timeout: 5000
};

// Set up the sender with your API key and request options
var sender = new gcm.Sender('YOUR_API_KEY_HERE', requestOptions);

// Prepare a GCM message...

// Send it to GCM endpoint with modified request options
sender.send(message, { registrationTokens: regTokens }, function (err, response) {
    if(err) console.error(err);
    else     console.log(response);
});

GCM client compatibility

As of January 9th, 2016, there are a few known compatibility issues with 3rd-party GCM client libraries:

phonegap-plugin-push

• No support for subscribing to PubSub topics
• Requirement for data payload object when sending a notification object
• Requirement for all 3 notification fields when sending a notification object (title, icon, message)

These issues are out of this project's context and can only be fixed by the respective 3rd-party project maintainers.

Debug

To enable debug mode (print requests and responses to and from GCM), set the DEBUG environment flag when running your app (assuming you use node app.js to run your app):

DEBUG=node-gcm node app.js

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