node-gamedig/protocols/gamespy2.js

class Gamespy2 extends require('./core') {
    constructor() {
        super();
        this.sessionId = 1;
        this.encoding = 'latin1';
        this.byteorder = 'be';
    }

    run(state) {
        const request = Buffer.from([0xfe,0xfd,0x00,0x00,0x00,0x00,0x01,0xff,0xff,0xff]);
        const packets = [];
        this.udpSend(request,
            (buffer) => {
                if(packets.length && buffer.readUInt8(0) === 0)
                    buffer = buffer.slice(1);
                packets.push(buffer);
            },
            () => {
                const buffer = Buffer.concat(packets);
                const reader = this.reader(buffer);
                const header = reader.uint(1);
                if(header !== 0) return;
                const pingId = reader.uint(4);
                if(pingId !== 1) return;

                while(!reader.done()) {
                    const key = reader.string();
                    const value = reader.string();
                    if(!key) break;
                    state.raw[key] = value;
                }

                if('hostname' in state.raw) state.name = state.raw.hostname;
                if('mapname' in state.raw) state.map = state.raw.mapname;
                if(this.trueTest(state.raw.password)) state.password = true;
                if('maxplayers' in state.raw) state.maxplayers = parseInt(state.raw.maxplayers);

                state.players = this.readFieldData(reader);
                state.raw.teams = this.readFieldData(reader);

                this.finish(state);
                return true;
            }
        );
    }

    readFieldData(reader) {
        const count = reader.uint(1);
        // count is unreliable (often it's wrong), so we don't use it.
        // read until we hit an empty first field string

        if(this.debug) console.log("Reading fields, starting at: "+reader.rest());

        const fields = [];
        while(!reader.done()) {
            let field = reader.string();
            if(!field) break;
            if(field.charCodeAt(0) <= 2) field = field.substring(1);
            fields.push(field);
            if(this.debug) console.log("field:"+field);
        }

        const units = [];
        outer: while(!reader.done()) {
            const unit = {};
            for(let iField = 0; iField < fields.length; iField++) {
                let key = fields[iField];
                let value = reader.string();
                if(!value && iField === 0) break outer;
                if(this.debug) console.log("value:"+value);
                if(key === 'player_') key = 'name';
                else if(key === 'score_') key = 'score';
                else if(key === 'deaths_') key = 'deaths';
                else if(key === 'ping_') key = 'ping';
                else if(key === 'team_') key = 'team';
                else if(key === 'kills_') key = 'kills';
                else if(key === 'team_t') key = 'name';
                else if(key === 'tickets_t') key = 'tickets';

                if(
                    key === 'score' || key === 'deaths'
                    || key === 'ping' || key === 'team'
                    || key === 'kills' || key === 'tickets'
                ) {
                    if(value === '') continue;
                    value = parseInt(value);
                }

                unit[key] = value;
            }
            units.push(unit);
        }

        return units;
    }
}

module.exports = Gamespy2;