app/server.js

const fs = require('fs');
const path = require('path');
const http = require('http');
const SSHClient = require('ssh2').Client;
const socketIO = require('socket.io');

// Create HTTP server
const server = http.createServer(onRequest);

// Attach Socket.IO to the server
const io = socketIO(server);

// Load static files into memory
let staticFiles = {};
let basePath = path.join(require.resolve('xterm'), '..');
staticFiles['/xterm.css'] = fs.readFileSync(path.join(basePath, '../css/xterm.css'));
staticFiles['/xterm.js'] = fs.readFileSync(path.join(basePath, 'xterm.js'));
basePath = path.join(require.resolve('xterm-addon-fit'), '..');
staticFiles['/xterm-addon-fit.js'] = fs.readFileSync(path.join(basePath, 'xterm-addon-fit.js'));
staticFiles['/'] = fs.readFileSync('index.html');

// Handle static file serving
function onRequest(req, res) {
  let file;
  if (req.method === 'GET' && (file = staticFiles[req.url])) {
    res.writeHead(200, {
      'Content-Type': 'text/' + (/css$/.test(req.url) ? 'css' : (/js$/.test(req.url) ? 'javascript' : 'html'))
    });
    return res.end(file);
  }
  res.writeHead(404);
  res.end();
}

// Setup WebSocket connection
io.on('connection', (socket) => {
  const conn = new SSHClient();
  
  // On SSH connection ready
  conn.on('ready', () => {
    socket.emit('data', '\r\n*** SSH CONNECTION ESTABLISHED ***\r\n');
    
    // Start shell session
    conn.shell((err, stream) => {
      if (err) {
        return socket.emit('data', '\r\n*** SSH SHELL ERROR: ' + err.message + ' ***\r\n');
      }
      
      // When data is received from the client, write to the stream
      socket.on('data', (data) => {
        stream.write(data);
      });
      
      // Send data back to the client when received from the SSH session
      stream.on('data', (d) => {
        socket.emit('data', d.toString('binary'));
      }).on('close', () => {
        conn.end();
      });
    });
  })
  .on('close', () => {
    socket.emit('data', '\r\n*** SSH CONNECTION CLOSED ***\r\n');
  })
  .on('error', (err) => {
    socket.emit('data', '\r\n*** SSH CONNECTION ERROR: ' + err.message + ' ***\r\n');
  })
  .connect({
    host: process.env.REMOTE_HOST,  // Use environment variable
    port: 22,  // Default SSH port
    username: process.env.REMOTE_USERNAME,  // Use environment variable
    password: process.env.REMOTE_PASSWORD  // Use environment variable (or use privateKey if required)
  });
});

// Start the server
const port = 8000;
console.log('Listening on port', port);
server.listen(port);