webssh_plus/main.js

// Reference: https://hub.packtpub.com/making-simple-web-based-ssh-client-using-nodejs-and-socketio/

var express = require('express');
var https = require('https');
var http = require('http');
var fs = require('fs');
var pty = require('node-pty');

// Set port
var port = 9774;

// Set up express server
let app = express();

// Set HTTP server root folder
app.use("/", express.static("./"));

// Creating an HTTP server
var server = http.createServer(app).listen(port);
console.log(`Listening on port ${port}`);

var io = require('socket.io')(server);

// When a new socket connects
io.on('connection', function (socket) {
  console.log('Client connect');
  socket.emit('client_identify');

  socket.on('client_size', function (size) {
    // Create terminal
    console.log(size);
    console.log({ cols: Math.floor(size.width / 9), rows: Math.floor(size.height / 10) })

    var term = pty.spawn('sh', [], {
        name: 'xterm-color',
        cols: Math.floor(size.width / 9),
        rows: Math.floor(size.height / 10),
        cwd: process.env.HOME,
        env: process.env
    });
    // Listen on the terminal for output and send it to the client
    term.on('data', function (data) {
        socket.emit('output', data);
    });
    // Listen on the client and send any input to the terminal
    socket.on('input', function (data) {
        term.write(data);
    });
    // When socket disconnects, destroy the terminal
    socket.on("disconnect", function () {
        term.destroy();
        console.log("Client disconnect");
    });
  })
});