server.js

// =================================================================
// require all necessary packages & our .env config file ===========
// =================================================================

// require('dotenv').config()
const jwt = require('jsonwebtoken');
const express = require('express');
const cors = require('cors');
const app = express();
const bodyParser = require('body-parser');
const config = require('dotenv').config()




// =================================================================
// app setup & configuration =======================================
// =================================================================

app.locals.trains = [
  { id: 1, line: 'green', status: 'running' },
  { id: 2, line: 'blue', status: 'delayed' },
  { id: 3, line: 'red', status: 'down' },
  { id: 4, line: 'orange', status: 'maintenance' }
];

// Use body parser so we can get info from POST/URL parameters
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(cors());

if (!config.CLIENT_SECRET || !config.USERNAME || !config.PASSWORD) {
  throw 'Make sure you have a CLIENT_SECRET, USERNAME, and PASSWORD in your env file'
}

app.set('secretKey', config.CLIENT_SECRET);
app.set('password', config.PASSWORD);
app.set('username', config.USERNAME);




// =================================================================
// API Endpoints ===================================================
// =================================================================

// This is all you baby!

// Authentication/Login Endpoint
app.post('/authenticate', (request, response) => {
 const user = request.body;
 console.log(user);
 // If the user enters credentials that don't match our hard-coded
 // credentials in our .env configuration file, send a JSON error
 if (user.username !== config.USERNAME || user.password !== config.PASSWORD) {
   response.status(403).send({
     success: false,
     message: 'Invalid Credentials'
   });
 }

 // If the credentials are accurate, create a token and send it back
 else {
   let token = jwt.sign(user, app.get('secretKey'), {
     expiresIn: 172800 // expires in 48 hours
   });

   response.json({
     success: true,
     username: user.username,
     token: token
   });
 }
});

app.get('/api/v1/trains', (request, response) => {
  response.send(app.locals.trains);
});

app.patch('/api/v1/trains/:id', (request, response) => {
  const { train } = request.body;
  const { id } = request.params;
  const index = app.locals.trains.findIndex((m) => m.id == id);

  if (index === -1) { return response.sendStatus(404); }

  const originalTrain = app.locals.trains[index];
  app.locals.trains[index] = Object.assign(originalTrain, train);

  return response.json(app.locals.trains);
});




// =================================================================
// start the server ================================================
// =================================================================

app.listen(3001);
console.log('Listening on http://localhost:3001');