node-minecraft-protocol/examples/proxy.js

var mc = require('../');

var states = mc.protocol.states;
function print_help() {
    console.log("usage: node proxy.js <target_srv> <user> [<password>]");
}

if (process.argv.length < 4) {
    console.log("Too few arguments!");
    print_help();
    process.exit(1);
}

process.argv.forEach(function(val, index, array) {
    if (val == "-h") {
        print_help();
        process.exit(0);
    }
});

var host = process.argv[2];
var port = 25565;
var user = process.argv[3];
var passwd = process.argv[4];

if (host.indexOf(':') != -1) {
    port = host.substring(host.indexOf(':')+1);
    host = host.substring(0, host.indexOf(':'));
}

var srv = mc.createServer({
  'online-mode': false,
  port: 25566
});
srv.on('login', function (client) {
  var addr = client.socket.remoteAddress;
  console.log('Incoming connection', '('+addr+')');
  var endedClient = false;
  var endedTargetClient = false;
  client.on('end', function() {
    endedClient = true;
    console.log('Connection closed by client', '('+addr+')');
    if (!endedTargetClient)
      targetClient.end("End");
  });
  client.on('error', function() {
    endedClient = true;
    console.log('Connection error by client', '('+addr+')');
    if (!endedTargetClient)
    targetClient.end("Error");
  });
  var targetClient = mc.createClient({
    host: host,
    port: port,
    username: user,
    password: passwd
  });
  client.on('packet', function(packet) {
    if (targetClient.state == states.PLAY && packet.state == states.PLAY) {
      console.log(`client->server: ${client.state}.${packet.id} : ${JSON.stringify(packet)}`);
      if (!endedTargetClient)
        targetClient.write(packet.id, packet);
    }
  });
  targetClient.on('packet', function(packet) {
    if (packet.state == states.PLAY && client.state == states.PLAY) {
      console.log(`client<-server: ${targetClient.state}.${packet.id} : ${JSON.stringify(packet)}`);
      if (!endedClient)
        client.write(packet.id, packet);
    }
  });
  targetClient.on('end', function() {
    endedTargetClient = true;
    console.log('Connection closed by server', '('+addr+')');
    if (!endedClient)
      client.end("End");
  });
  targetClient.on('error', function() {
    endedTargetClient = true;
    console.log('Connection error by server', '('+addr+')');
    if (!endedClient)
      client.end("Error");
  });
});