const Core = require('./core'), Varint = require('varint'); class Minecraft extends Core { constructor() { super(); this.srvRecord = "_minecraft._tcp"; } 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(4), 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.debugLog("Packet ID: "+packetId); const strLen = reader.varint(); this.debugLog("String Length: "+strLen); const str = reader.rest().toString('utf8'); this.debugLog(str); const json = JSON.parse(str); delete json.favicon; state.raw = json; state.maxplayers = json.players.max; if(json.players.sample) { for(const player of json.players.sample) { state.players.push({ id: player.id, name: player.name }); } } while(state.players.length < json.players.online) { state.players.push({}); } } 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 ]); } } module.exports = Minecraft;