node-minecraft-protocol/examples/client_http_proxy/client_http_proxy.js

const mc = require('minecraft-protocol');
const Http = require("http");

if(process.argv.length < 6 || process.argv.length > 8) {
  console.log("Usage : node echo.js <host> <port> <proxyHost> <proxyPort> [<name>] [<password>]");
  process.exit(1);
}

const proxyHost=process.argv[4];
const proxyPort=process.argv[5];

const req = Http.request({
  host: proxyHost,
  port: proxyPort,
  method: 'CONNECT',
  path: process.argv[2] + ":" + parseInt(process.argv[3])
});

req.on("connect", function(res, stream) {
  const client = mc.createClient({
    stream: stream,
    username: process.argv[6] ? process.argv[6] : "echo",
    password: process.argv[7]
  });

  client.on('connect', function() {
    console.info('connected');
  });
  client.on('disconnect', function(packet) {
    console.log('disconnected: '+ packet.reason);
  });
  client.on('end', function(err) {
    console.log('Connection lost');
  });
  client.on('chat', function(packet) {
    const jsonMsg = JSON.parse(packet.message);
    if(jsonMsg.translate === 'chat.type.announcement' || jsonMsg.translate === 'chat.type.text') {
      const username = jsonMsg.with[0].text;
      const msg = jsonMsg.with[1];
      if(username === client.username) return;
      client.write('chat', {message: msg});
    }
  });

});