WhatsApp NodeJS Code Snippet for Robin

const WebSocket = require('ws');
const Crypto = require('crypto');
const EC = require('elliptic').ec;

const ec = new EC('curve25519');

var whatsAppRunning = false;
var ws = null;
var qrCodeString = null;
var clientId = null;
var messageTag = null;

const whatsAppKey = ec.genKeyPair();

const userInformation = {
    phoneNumber: '',
    locales: '',
    waVersion: '',
    phone: '',
    name: ''
};

function isWhatsAppAlive() {
    return whatsAppRunning;
}

function getQrCodeString() {
    return qrCodeString;
}

function getUserInformation() {
    return userInformation;
}

function initWebsocket() {
    ws = new WebSocket('wss://web.whatsapp.com/ws', {
        origin: 'https://web.whatsapp.com'
    });

    ws.on('open', () => {
        ws.send(getQrCodeRequestMessage());
    });

    ws.on('close', (e) => {
        console.log('CLOOSED!!');
        console.log(e);
        ws = null;
        whatsAppRunning = false;
    });

    ws.on('message', (data) => {
        if (data != null) {
            try {
                var messageType = data.split(',')[0];
                if (messageType.includes('.')) {
                    messageType = messageType.split('.')[1]
                }
                switch (messageType) {
                    case '--0':
                        generateQrCodeString(data);
                        break;
                    case 's1':
                        whatsAppRunning = true;
                        subscribeNumber('49123123123');
                        receiveProfileInformation(data);
                        break;
                    default:
                        const payload = JSON.parse(data.substring(data.indexOf(",") + 1));
                        switch (payload[0]) {
                            case 'Presence':
                                const phone = payload[1].id.split('@')[0];
                                const type = payload[1].type;

                                console.log(phone + ' = ' + type);
                                break;
                            default:
                        }
                }
            } catch { }
        }
    });
}

function subscribeNumber(number) {
    ws.send(`812.--26,,["action","presence","subscribe","${number}@c.us"]`)
}

function generateQrCodeString(data) {
    const qrMessage = JSON.parse(data.split('--0,')[1]);
    const ref = qrMessage.ref;
    const pubs64 = whatsAppKey.getPrivate().toBuffer().toString('base64');
    qrCodeString = ref + ',' + pubs64 + ',' + clientId;
}

function getQrCodeRequestMessage() {
    clientId = Crypto.randomBytes(16).toString('base64');
    messageTag = Math.floor(Date.now() / 1000) + '';
    return `${messageTag}.--0,["admin","init",[0,3,9309],["Muschel","","10.13.6"],"${clientId}",true]`;
}

function receiveProfileInformation(data) {
    const connection = JSON.parse(data.split('s1,')[1])[1];
    userInformation.phoneNumber = connection.wid.split('@')[0];
    userInformation.locales = connection.locales;
    userInformation.name = connection.pushname;
    userInformation.waVersion = connection.phone.wa_version;
    userInformation.phone = connection.phone.device_manufacturer + ', ' + connection.phone.device_model;
}

module.exports = {
    initWebsocket: initWebsocket,
    getQrCodeString: getQrCodeString,
    isWhatsAppAlive: isWhatsAppAlive,
    getUserInformation: getUserInformation,
    subscribeNumber: subscribeNumber
}