node-gamedig/protocols/minecraftvanilla.js

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import Core from './core.js'
import Varint from 'varint'
export default class minecraftvanilla extends Core {
async run (state) {
const portBuf = Buffer.alloc(2)
portBuf.writeUInt16BE(this.options.port, 0)
const addressBuf = Buffer.from(this.options.host, 'utf8')
const bufs = [
this.varIntBuffer(47),
this.varIntBuffer(addressBuf.length),
addressBuf,
portBuf,
this.varIntBuffer(1)
]
const outBuffer = Buffer.concat([
this.buildPacket(0, Buffer.concat(bufs)),
this.buildPacket(0)
])
const data = await this.withTcp(async socket => {
return await this.tcpSend(socket, outBuffer, data => {
if (data.length < 10) return
const reader = this.reader(data)
const length = reader.varint()
if (data.length < length) return
return reader.rest()
})
})
const reader = this.reader(data)
const packetId = reader.varint()
this.logger.debug('Packet ID: ' + packetId)
const strLen = reader.varint()
this.logger.debug('String Length: ' + strLen)
const rest = reader.rest()
const str = rest.toString('utf8', 0, strLen)
this.logger.debug(str)
const json = JSON.parse(str.substring(0, strLen))
delete json.favicon
state.raw = json
state.maxplayers = json.players.max
state.numplayers = json.players.online
if (json.players.sample) {
for (const player of json.players.sample) {
state.players.push({
id: player.id,
name: player.name
})
}
}
// Better Compatibility Checker mod support
let bccJson = {}
if (rest.length > strLen) {
const bccStr = rest.toString('utf8', strLen + 1)
bccJson = JSON.parse(bccStr)
}
state.raw.bcc = bccJson
}
varIntBuffer (num) {
return Buffer.from(Varint.encode(num))
}
buildPacket (id, data) {
if (!data) data = Buffer.from([])
const idBuffer = this.varIntBuffer(id)
return Buffer.concat([
this.varIntBuffer(data.length + idBuffer.length),
idBuffer,
data
])
}
}