node-gamedig/protocols/minecraftvanilla.js
Pascal Sthamer f3b04d52d5
Fix typo
2020-02-18 14:53:39 +01:00

83 lines
2.5 KiB
JavaScript

const Core = require('./core'),
Varint = require('varint');
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.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
});
}
}
// players.sample may not contain all players or no players at all, depending on how many players are online.
// Insert a dummy player object for every online player that is not listed in players.sample.
// Limit player amount to 10.000 players for performance reasons.
for (let i = state.players.length; i < Math.min(json.players.online, 10000); i++) {
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 = MinecraftVanilla;