doom3.js

import Core from './core.js'

export default class doom3 extends Core {
  constructor () {
    super()
    this.encoding = 'latin1'
  }

  async run (state) {
    const body = await this.udpSend('\xff\xffgetInfo\x00PiNGPoNg\x00', packet => {
      const reader = this.reader(packet)
      const header = reader.uint(2)
      if (header !== 0xffff) return
      const header2 = reader.string()
      if (header2 !== 'infoResponse') return
      const challengePart1 = reader.string(4)
      if (challengePart1 !== 'PiNG') return
      // some doom3 implementations only return the first 4 bytes of the challenge
      const challengePart2 = reader.string(4)
      if (challengePart2 !== 'PoNg') reader.skip(-4)
      return reader.rest()
    })

    let reader = this.reader(body)
    const protoVersion = reader.uint(4)
    state.raw.protocolVersion = (protoVersion >> 16) + '.' + (protoVersion & 0xffff)
    state.version = state.raw.protocolVersion

    // some doom implementations send us a packet size here, some don't (etqw does this)
    // we can tell if this is a packet size, because the third and fourth byte will be 0 (no packets are that massive)
    reader.skip(2)
    const packetContainsSize = (reader.uint(2) === 0)
    reader.skip(-4)

    if (packetContainsSize) {
      const size = reader.uint(4)
      this.logger.debug('Received packet size: ' + size)
    }

    while (!reader.done()) {
      const key = reader.string()
      let value = this.stripColors(reader.string())
      if (key === 'si_map') {
        value = value.replace('maps/', '')
        value = value.replace('.entities', '')
      }
      if (!key) break
      state.raw[key] = value
      this.logger.debug(key + '=' + value)
    }

    const isEtqw = state.raw.gamename && state.raw.gamename.toLowerCase().includes('etqw')

    const rest = reader.rest()
    let playerResult = this.attemptPlayerParse(rest, isEtqw, false, false, false)
    if (!playerResult) playerResult = this.attemptPlayerParse(rest, isEtqw, true, false, false)
    if (!playerResult) playerResult = this.attemptPlayerParse(rest, isEtqw, true, true, true)
    if (!playerResult) {
      throw new Error('Unable to find a suitable parse strategy for player list')
    }
    let players;
    [players, reader] = playerResult

    state.numplayers = players.length
    for (const player of players) {
      if (!player.ping || player.typeflag) { state.bots.push(player) } else { state.players.push(player) }
    }

    state.raw.osmask = reader.uint(4)
    if (isEtqw) {
      state.raw.ranked = reader.uint(1)
      state.raw.timeleft = reader.uint(4)
      state.raw.gamestate = reader.uint(1)
      state.raw.servertype = reader.uint(1)
      // 0 = regular, 1 = tv
      if (state.raw.servertype === 0) {
        state.raw.interestedClients = reader.uint(1)
      } else if (state.raw.servertype === 1) {
        state.raw.connectedClients = reader.uint(4)
        state.raw.maxClients = reader.uint(4)
      }
    }

    if (state.raw.si_name) state.name = state.raw.si_name
    if (state.raw.si_map) state.map = state.raw.si_map
    if (state.raw.si_maxplayers) state.maxplayers = parseInt(state.raw.si_maxplayers)
    if (state.raw.si_maxPlayers) state.maxplayers = parseInt(state.raw.si_maxPlayers)
    if (state.raw.si_usepass === '1') state.password = true
    if (state.raw.si_needPass === '1') state.password = true
    if (this.options.port === 27733) state.gamePort = 3074 // etqw has a different query and game port
  }

  attemptPlayerParse (rest, isEtqw, hasClanTag, hasClanTagPos, hasTypeFlag) {
    this.logger.debug('starting player parse attempt:')
    this.logger.debug('isEtqw: ' + isEtqw)
    this.logger.debug('hasClanTag: ' + hasClanTag)
    this.logger.debug('hasClanTagPos: ' + hasClanTagPos)
    this.logger.debug('hasTypeFlag: ' + hasTypeFlag)
    const reader = this.reader(rest)
    let lastId = -1
    const players = []
    while (true) {
      this.logger.debug('---')
      if (reader.done()) {
        this.logger.debug('* aborting attempt, overran buffer *')
        return null
      }
      const player = {}
      player.id = reader.uint(1)
      this.logger.debug('id: ' + player.id)
      if (player.id <= lastId || player.id > 0x20) {
        this.logger.debug('* aborting attempt, invalid player id *')
        return null
      }
      lastId = player.id
      if (player.id === 0x20) {
        this.logger.debug('* player parse successful *')
        break
      }
      player.ping = reader.uint(2)
      this.logger.debug('ping: ' + player.ping)
      if (!isEtqw) {
        player.rate = reader.uint(4)
        this.logger.debug('rate: ' + player.rate)
      }
      player.name = this.stripColors(reader.string())
      this.logger.debug('name: ' + player.name)
      if (hasClanTag) {
        if (hasClanTagPos) {
          const clanTagPos = reader.uint(1)
          this.logger.debug('clanTagPos: ' + clanTagPos)
        }
        player.clantag = this.stripColors(reader.string())
        this.logger.debug('clan tag: ' + player.clantag)
      }
      if (hasTypeFlag) {
        player.typeflag = reader.uint(1)
        this.logger.debug('type flag: ' + player.typeflag)
      }
      players.push(player)
    }
    return [players, reader]
  }

  stripColors (str) {
    // uses quake 3 color codes
    return this.options.stripColors ? str.replace(/\^(X.{6}|.)/g, '') : str
  }
}