server.js

var express = require('express');
var morgan = require('morgan');
var path = require('path');
var Pool = require('pg').Pool;
var crypto = require('crypto');
var bodyParser = require('body-parser');
var config = {
    user: 'ayantorres',
    database: 'ayantorres',
    host: 'db.imad.hasura-app.io',
    port: '5432',
    password: process.env.DB_PASSWORD
};

var app = express();
app.use(morgan('combined'));
app.use(bodyParser.json());

app.get('/', function (req, res) {
  res.sendFile(path.join(__dirname, 'ui', 'index.html'));
});

app.get('/ui/main.js', function (req, res) {
  res.sendFile(path.join(__dirname, 'ui', 'main.js'));
});

app.get('/article-one', function(req,res){
   res.sendFile(path.join(__dirname, 'ui', 'article-one.html'));
});



var Pool = new Pool(config);
app.get('/test-db', function(req,res){
        Pool.quary('SELECT * FROM test', function (err, result) {
        if(err)
        {
            res.status(500).send(err.toString());
        }
        else{
            res.send(JSON.Stringfy(result));
        }
    });
});

app.get('/article-two', function(req,res){
   res.sendFile(path.join(__dirname, 'ui', 'article-two.html')); 
});

app.get('/article-three', function(req,res){
   res.sendFile(path.join(__dirname, 'ui', 'article-three.html')); 
});

app.get('/ui/style.css', function (req, res) {
  res.sendFile(path.join(__dirname, 'ui', 'style.css'));
});

app.get('/ui/madi.png', function (req, res) {
  res.sendFile(path.join(__dirname, 'ui', 'madi.png'));
});

var counter = 0;
app.get('/counter', function (req, res) {
    counter = counter + 1;
    res.send(counter.toString());
});

// Do not change port, otherwise your app won't run on IMAD servers
// Use 8080 only for local development if you already have apache running on 80

var port = 80;
app.listen(port, function () {
  console.log(`IMAD course app listening on port ${port}!`);
});

var names = [];
app.get('/submit-name', function (req, res) {
  var name = req.query.name;
  names.push(name);
  // JSON = Javascript Object Notation
  res.send(JSON.stringify(names));
});
function hash(input, salt){
    // create hash
    var hashed = crypto.pbkdf2Sync(input, salt, 10000, 512, 'sha512');
    return hashed.toString('hex');
}

app.get('/hash/:input', function(req, res){
   var hashedString = hash(req.params.input, 'This-is-a-random-string');
   res.send(hashedString);
});

app.post('/create-user', function(req, res){
   // username and password
   var username = req.body.username;
   var password = req.body.password;
   var salt = crypto.randomBytes(128).toString('hex');
   var dbString = hash(password, salt);
   Pool.query('INSERT INTO "user" (username, password) VALUES ($1,$2)',[username,dbString], function(err,result){
       if(err)
        {
            res.status(500).send(err.toString());
        }
        else{
            res.send("User Sucessfully Created");
        }
       
   });
});