node-gamedig/protocols/battlefield.js

const async = require('async');

class Battlefield extends require('./core') {
    constructor() {
		super();
		this.encoding = 'latin1';
	}

	run(state) {
		async.series([
			(c) => {
				this.query(['serverInfo'], (data) => {
					if(this.debug) console.log(data);
					if(data.shift() !== 'OK') return this.fatal('Missing OK');

					state.raw.name = data.shift();
					state.raw.numplayers = parseInt(data.shift());
					state.maxplayers = parseInt(data.shift());
					state.raw.gametype = data.shift();
					state.map = data.shift();
					state.raw.roundsplayed = parseInt(data.shift());
					state.raw.roundstotal = parseInt(data.shift());
					
					const teamCount = data.shift();
					state.raw.teams = [];
					for(let i = 0; i < teamCount; i++) {
                        const tickets = parseFloat(data.shift());
						state.raw.teams.push({
							tickets:tickets
						});
					}
					
					state.raw.targetscore = parseInt(data.shift());
					data.shift();
					state.raw.ranked = (data.shift() === 'true');
					state.raw.punkbuster = (data.shift() === 'true');
					state.password = (data.shift() === 'true');
					state.raw.uptime = parseInt(data.shift());
					state.raw.roundtime = parseInt(data.shift());
					if(this.isBadCompany2) {
						data.shift();
						data.shift();
					}
					state.raw.ip = data.shift();
					state.raw.punkbusterversion = data.shift();
					state.raw.joinqueue = (data.shift() === 'true');
					state.raw.region = data.shift();
					if(!this.isBadCompany2) {
						state.raw.pingsite = data.shift();
						state.raw.country = data.shift();
						state.raw.quickmatch = (data.shift() === 'true');
					}
					
					c();
				});
			},
			(c) => {
				this.query(['version'], (data) => {
					if(this.debug) console.log(data);
					if(data[0] !== 'OK') return this.fatal('Missing OK');
					
					state.raw.version = data[2];
					
					c();
				});
			},
			(c) => {
				this.query(['listPlayers','all'], (data) => {
					if(this.debug) console.log(data);
					if(data.shift() !== 'OK') return this.fatal('Missing OK');

                    const fieldCount = parseInt(data.shift());
                    const fields = [];
					for(let i = 0; i < fieldCount; i++) {
						fields.push(data.shift());
					}
                    const numplayers = data.shift();
					for(let i = 0; i < numplayers; i++) {
                        const player = {};
						for (let key of fields) {
                            let value = data.shift();

							if(key === 'teamId') key = 'team';
							else if(key === 'squadId') key = 'squad';

							if(
								key === 'kills'
								|| key === 'deaths'
								|| key === 'score'
								|| key === 'rank'
								|| key === 'team'
								|| key === 'squad'
								|| key === 'ping'
								|| key === 'type'
							) {
								value = parseInt(value);
							}

							player[key] = value;
						}
						state.players.push(player);
					}

					this.finish(state);
				});
			}
		]);
	}
	query(params,c) {
		this.tcpSend(buildPacket(params), (data) => {
            const decoded = this.decodePacket(data);
			if(!decoded) return false;
			c(decoded);
			return true;
		});
	}
	decodePacket(buffer) {
		if(buffer.length < 8) return false;
        const reader = this.reader(buffer);
        const header = reader.uint(4);
        const totalLength = reader.uint(4);
		if(buffer.length < totalLength) return false;

        const paramCount = reader.uint(4);
        const params = [];
		for(let i = 0; i < paramCount; i++) {
            const len = reader.uint(4);
			params.push(reader.string({length:len}));
            const strNull = reader.uint(1);
		}
		return params;
	}
}

function buildPacket(params) {
    const paramBuffers = [];
	for (const param of params) {
		paramBuffers.push(Buffer.from(param,'utf8'));
	}

    let totalLength = 12;
	for (const paramBuffer of paramBuffers) {
		totalLength += paramBuffer.length+1+4;
	}

    const b = Buffer.alloc(totalLength);
	b.writeUInt32LE(0,0);
	b.writeUInt32LE(totalLength,4);
	b.writeUInt32LE(params.length,8);
    let offset = 12;
	for (const paramBuffer of paramBuffers) {
		b.writeUInt32LE(paramBuffer.length, offset); offset += 4;
		paramBuffer.copy(b, offset); offset += paramBuffer.length;
		b.writeUInt8(0, offset); offset += 1;
	}

	return b;
}

module.exports = Battlefield;