HeliosLauncher/app/assets/js/serverstatus.js

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const net = require('net')
/**
* Retrieves the status of a minecraft server.
*
* @param {string} address The server address.
* @param {number} port Optional. The port of the server. Defaults to 25565.
* @returns {Promise.<Object>} A promise which resolves to an object containing
* status information.
*/
exports.getStatus = function(address, port = 25565){
if(port == null || port == ''){
port = 25565
}
if(typeof port === 'string'){
port = parseInt(port)
}
return new Promise((resolve, reject) => {
const socket = net.connect(port, address, () => {
let buff = new Buffer([0xFE, 0x01])
socket.write(buff)
})
socket.setTimeout(2500, () => {
socket.end()
reject({
code: 'ETIMEDOUT',
errno: 'ETIMEDOUT',
address,
port
})
})
socket.on('data', (data) => {
if(data != null && data != ''){
let server_info = data.toString().split('\x00\x00\x00')
const NUM_FIELDS = 6
if(server_info != null && server_info.length >= NUM_FIELDS){
resolve({
online: true,
version: server_info[2].replace(/\u0000/g, ''),
motd: server_info[3].replace(/\u0000/g, ''),
onlinePlayers: server_info[4].replace(/\u0000/g, ''),
maxPlayers: server_info[5].replace(/\u0000/g,'')
})
} else {
resolve({
online: false
})
}
}
socket.end()
})
socket.on('error', (err) => {
socket.destroy()
reject(err)
// ENOTFOUND = Unable to resolve.
// ECONNREFUSED = Unable to connect to port.
})
})
}