server.js

const Turn = require('node-turn');
const express = require('express');
const bodyParser = require('body-parser');
const path = require('path');

const app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

const server = new Turn({
  authMech: 'long-term',
  credentials: {
    username: "password"
  },
  listeningPort: 3478
});

server.start();

let users = [];

app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'admin.html'));
});

app.get('/users', (req, res) => {
  res.json(users);
});

app.post('/addUser', (req, res) => {
  const { username, password } = req.body;
  users.push({ username, password });
  server.addUser(username, password);
  res.sendStatus(200);
});

app.post('/removeUser', (req, res) => {
  const { username } = req.body;
  users = users.filter(user => user.username !== username);
  server.removeUser(username);
  res.sendStatus(200);
});

app.listen(8080, () => {
  console.log('Admin panel listening on port 8080');
});