@rlqd/minecraft-server-util/src/statusFE01FA.ts

A Node.js library for Minecraft servers that can retrieve status, perform queries, and RCON into servers.

import assert from 'assert';
import { clean, format, parse, toHTML } from '@rlqd/minecraft-motd-util';
import { TextEncoder } from 'util';
import TCPClient from './structure/TCPClient';
import { JavaStatusOptions } from './types/JavaStatusOptions';
import { JavaStatusFE01FAResponse } from './types/JavaStatusFE01FAResponse';
import { resolveSRV } from './util/srvRecord';

const encoder = new TextEncoder();

/**
 * @deprecated
 */
export function statusFE01FA(host: string, port = 25565, options?: JavaStatusOptions): Promise<JavaStatusFE01FAResponse> {
	process.emitWarning('Use of statusFE01FA() has been deprecated since 5.2.0 in favor of a statusLegacy(). This method will be removed during the next major release of the minecraft-server-util library.', 'DeprecationWarning');

	host = host.trim();

	assert(typeof host === 'string', `Expected 'host' to be a 'string', got '${typeof host}'`);
	assert(host.length > 1, `Expected 'host' to have a length greater than 0, got ${host.length}`);
	assert(typeof port === 'number', `Expected 'port' to be a 'number', got '${typeof port}'`);
	assert(Number.isInteger(port), `Expected 'port' to be an integer, got '${port}'`);
	assert(port >= 0, `Expected 'port' to be greater than or equal to 0, got '${port}'`);
	assert(port <= 65535, `Expected 'port' to be less than or equal to 65535, got '${port}'`);
	assert(typeof options === 'object' || typeof options === 'undefined', `Expected 'options' to be an 'object' or 'undefined', got '${typeof options}'`);

	if (typeof options === 'object') {
		assert(typeof options.enableSRV === 'boolean' || typeof options.enableSRV === 'undefined', `Expected 'options.enableSRV' to be a 'boolean' or 'undefined', got '${typeof options.enableSRV}'`);
		assert(typeof options.timeout === 'number' || typeof options.timeout === 'undefined', `Expected 'options.timeout' to be a 'number' or 'undefined', got '${typeof options.timeout}'`);

		if (typeof options.timeout === 'number') {
			assert(Number.isInteger(options.timeout), `Expected 'options.timeout' to be an integer, got '${options.timeout}'`);
			assert(options.timeout >= 0, `Expected 'options.timeout' to be greater than or equal to 0, got '${options.timeout}'`);
		}
	}

	return new Promise(async (resolve, reject) => {
		const socket = new TCPClient();

		const timeout = setTimeout(() => {
			socket?.close();

			reject(new Error('Server is offline or unreachable'));
		}, options?.timeout ?? 1000 * 5);

		try {
			let srvRecord = null;

			if (typeof options === 'undefined' || typeof options.enableSRV === 'undefined' || options.enableSRV) {
				srvRecord = await resolveSRV(host);

				if (srvRecord) {
					host = srvRecord.host;
					port = srvRecord.port;
				}
			}

			await socket.connect({ host, port, timeout: options?.timeout ?? 1000 * 5 });

			// Client to server packet
			// https://minecraft.wiki/w/Java_Edition_protocol/Server_List_Ping#Client_to_server
			{
				const hostBytes = encoder.encode(host);

				socket.writeBytes(Uint8Array.from([0xFE, 0x01, 0xFA]));
				socket.writeInt16BE(11);
				socket.writeStringBytes('MC|PingHost');
				socket.writeInt16BE(7 + hostBytes.byteLength);
				socket.writeByte(0x4A);
				socket.writeInt16BE(hostBytes.length);
				socket.writeBytes(hostBytes);
				socket.writeInt16BE(port);
				await socket.flush(false);
			}

			// Server to client packet
			// https://minecraft.wiki/w/Java_Edition_protocol/Server_List_Ping#Server_to_client
			{
				const kickIdentifier = await socket.readByte();
				if (kickIdentifier !== 0xFF) throw new Error('Expected server to send 0xFF kick packet, got ' + kickIdentifier);

				const remainingLength = await socket.readInt16BE();
				const remainingData = await socket.readBytes(remainingLength * 2);

				const [protocolVersionString, version, motdString, onlinePlayersString, maxPlayersString] = remainingData.slice(6).swap16().toString('utf16le').split('\0');

				const motd = parse(motdString);

				socket.close();

				clearTimeout(timeout);

				resolve({
					protocolVersion: parseInt(protocolVersionString),
					version,
					players: {
						online: parseInt(onlinePlayersString),
						max: parseInt(maxPlayersString)
					},
					motd: {
						raw: format(motd),
						clean: clean(motd),
						html: toHTML(motd)
					},
					srvRecord
				});
			}
		} catch (e) {
			clearTimeout(timeout);

			socket?.close();

			reject(e);
		}
	});
}