chomens-bot-js/plugins/proxy.js

const util = require('util')
const mc = require('minecraft-protocol')
const { loadPlugins } = require('../util/loadPlugins')

function inject (bot, dcclient, config) {
  if (!config.proxy.enabled) return

  let index
  config.servers.forEach((server, _index) => {
    if (bot.options.host !== server.host) return
    index = _index
  })

  const version = config.proxy.version
  const srv = mc.createServer({
    'online-mode': false,
    port: 25566 + index,
    keepAlive: false,
    version
  })

  srv.on('login', function (client) {
    bot.console.info(`[Proxy] ${client.username} connected to proxy`)
    let clientEnded = false
    let targetEnded = false

    const target = mc.createClient({
      username: client.username,
      host: bot.options.host,
      version
    })

    const targetPacketBlacklist = []

    target.chat = function (message) {
      target.write('chat', { message })
    }

    target.on('login', (packet) => {
      bot.console.info(`[Proxy] ${client.username} target logged in`)
      target.entityId = packet.entityId
      loadPlugins(bot, null, config, null, target, client, true, targetPacketBlacklist)
    })

    target.on('packet', (data, meta) => {
      if (!clientEnded &&
            meta.state === mc.states.PLAY &&
            client.state === mc.states.PLAY &&
            !targetPacketBlacklist.includes(meta.name)
      ) client.write(meta.name, data)
    })

    target.on('error', () => {})

    target.on('end', () => {
      target.end()
      targetEnded = true
    })

    client.on('end', function () {
      clientEnded = true
      target.end()
      target.removeAllListeners()
      client.removeAllListeners()
      bot.console.info(`[Proxy] ${client.username} ended`)
    })

    client.on('error', function () {
      clientEnded = true
      target.removeAllListeners()
      client.removeAllListeners()
      bot.console.info(`[Proxy] ${client.username} got error`)
    })

    client.on('packet', (data, meta) => {
      if (meta.name === 'chat' && !data.message?.startsWith('/')) {
        if (data.message.startsWith('.')) {
          return bot.command_handler.run(
            client.username,
            client.username,
            '*' + data.message.substring(1),
            client.uuid,
            null,
            'h',
            'o',
            client.username
          )
        }
        return
      }
      target.write(meta.name, data)
    })

    function endListener (reason) {
      client.end(`Bot disconnected with reason: ${util.inspect(reason)}`)
      bot.off('end', endListener)
      srv.close()
      srv.removeAllListeners()
    }
    bot.on('end', endListener)
  })
};

module.exports = { inject }