@jnode/minecraft/src/java/client.js

Simple Minecraft package for Node.js.

/*
JustMinecraft/java/client.js

Simple Minecraft package for Node.js.

by JustNode Dev Team / JustApple
*/

//load node packages
const net = require('net');
const crypto = require('crypto');

//load classes and functions
const resolveRsv = require('./resolve-srv.js');
const MinecraftJavaConnection = require('./connection.js');
const templates = require('./templates.js');

//Minecraft Java client
class MinecraftJavaClient {
	constructor(host = 'localhost', port = 25565, options = {}) {
		//Minecraft server original host and port
		this.host = host;
		this.port = port;
		
		//client options
		this.options = options;
	}
	
	//get server status
	getServerStatus(ping = true) {
		return new Promise(async (resolve, reject) => {
			//check Minecraft SRV record before continue
			if (!this._host) {
				const record = await resolveRsv(this.host, this.port);
				this._host = record.host;
				this._port = record.port;
			}
			
			//create connection
			const socket = new net.Socket();
			const connection = new MinecraftJavaConnection(socket);
			connection.connect(this._host, this._port, 5000);
			
			//connection timeout
			connection.on('timeout', () => {
				reject(new Error('Connect timeout.'));
			});
			
			//ping
			let pingMs;
			
			//handshake after connected
			connection.on('connect', async () => {
				//handshake packet
				connection.sendPacket(0x00, templates.handshake.serverbound[0x00].createData([
					767, //protocol version
					this._host, //server address
					this._port, //server port
					1 //next state (Status)
				]));
				
				//request status
				connection.sendPacket(0x00);
				
				//ping
				if (ping) {
					pingMs = Date.now();
					connection.sendPacket(0x01, templates.status.serverbound[0x01].createData([pingMs]));
				}
			});
			
			//receive status packet
			let status = {};
			connection.on('packet', (packet) => {
				if (packet.id === 0x00) { //received packet
					status = JSON.parse(templates.status.clientbound[0x00].readData(packet.data).value[0]);
					if (!ping) {
						connection.disconnect();
						resolve(status);
					}
				}
				
				if (packet.id === 0x01) { //received pong
					connection.disconnect();
					status.ping = Date.now() - pingMs;
					resolve(status);
				}
			});
			
			//handle error
			connection.on('error', reject);
			
			return;
		});
	}
}

//export
module.exports = MinecraftJavaClient;