gateway-v9-custom.js

const {WebSocket} = require('ws');
const config = require('../config.json');

let heartBeatInterval,
    sequence = null,
    debug = false,
    heartBeatAck = true;
const ws = new WebSocket('wss://gateway.discord.gg/?v=9&encoding=json');

ws.on('open', () => {
    console.log('Websocket connected!')
})

ws.on('message', msg => {
    if (debug) console.log('Websocket message: ' + msg)
    try {
        const data = JSON.parse(msg.toString());
        if (data.s)
            sequence = data.s;

        switch (data.op) {

            case 0:
                const event = data.t;
                console.log(`Event: ${data.t}`);

                if (event === 'PRESENCE_UPDATE') {
                    console.log(data.d.status, data.d.client_status)
                }
                break;

            case 10:
                console.log(`Starting heartbeat interval of ${data.d.heartbeat_interval}ms!`)
                heartBeatInterval = setInterval(() => {
                    if (!heartBeatAck) {
                        console.error(`Last heartbeat wasn't acknowledged!\nQuitting...`)
                        ws.close(-1);
                        process.exit(-1);
                    }

                    if (debug) console.log('Sending heartbeat!')
                    heartBeatAck = false;
                    ws.send(JSON.stringify({
                        op: 1,
                        d: sequence
                    }))
                }, data.d.heartbeat_interval);

                console.log('Identifying...');
                ws.send(JSON.stringify({
                    op: 2,
                    d: {
                        token: config.auth_token,
                        intents: 256,
                        properties: {
                            $os: 'linux',
                            $browser: 'StatusBot',
                            $device: 'StatusBot',
                        }
                    }
                }));
                break;

            case 11:
                if (debug) console.log('Heartbeat acknowledged!')
                heartBeatAck = true;
                break;

            default:
                console.log('Unknown opcode ' + data.op, data);
                break;
        }
    }
    catch (e) {
        console.error('Failed to parse Websocket message: ', e)
    }
})