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server.js
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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 session = require('express-session');
var config = {
user: 'rrgkmech',
database: 'rrgkmech',
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.use(session({
secret: 'someRandomSecretValue',
cookie: { maxAge: 1000 * 60 * 60 * 24 * 30}
}));
function createTemplate (data) {
var title = data.title;
var date = data.date;
var heading = data.heading;
var content = data.content;
var htmlTemplate = `<html>
<head>
<title>
${title}
</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link href="/ui/style.css" rel="stylesheet" />
</head>
<body>
<div class="container">
<div>
<a href="/">Home</a>
</div>
<hr/>
<h3>
${heading}
</h3>
<div>
${date.toDateString()}
</div>
<div>
${content}
</div>
</div>
</body>
</html>`;
return htmlTemplate;
}
app.get('/', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'index.html'));
});
function hash (input, salt){
// How do we create a hash?
var hashed = crypto.pbkdf2Sync(input, salt, 100000, 512, 'sha512');
return ["pbkdf2", "10000", salt, hashed.toString('hex')].join('$');
}
app.get('/hash/:input', function(req,res){
var hashedString = hash(req.params.input, 'this-is-some-random-string');
res.send(hashedString);
});
app.post('/create-user', function(req, res){
// username, password
// JSON
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 successfully created: ' + username);
}
});
});
app.post('/login', function(req, res){
var username = req.body.username;
var password = req.body.password;
pool.query('SELECT * FROM "user" WHERE username = $1', [username], function(err, result){
if(err){
res.status(500).send(err.toString());
} else {
if (result.rows.length === 0) {
res.send(403).send('username/password invalid');
} else {
// Match the password
var dbString = result.rows[0].password;
var salt = dbstring.split('$')[2];
var hashedPassword = hash(password, salt); // Creating a hash on the password submitted and the original slat
if (hashedPassword === dbString) {
// set the session
req.session.auth = {userId: result.rows[0].id};
// set a cookie with a session id
// internally, on the server side, it maps the session id to an object
// {auth: {userId }}
res.send('Credentials correct!');
} else {
res.send(403).send('username/password invalid');
}
}
}
});
});
app.get('/check-login', function(req, res){
if (req.session && req.session.auth && req.session.auth.userId) {
res.send('You are logged in: ' + req.session.auth.userID.toString());
} else {
res.send('You are not logged in');
}
});
app.get('/logout', function(req, res){
delete req.session.auth;
res.send('Logged Out');
});
var pool = new Pool(config);
app.get('/test-db', function(req, res) {
//make a select request
//return a response with the result
pool.query('SELECT * FROM test', function(err, result){
if(err){
res.status(500).send(err.toString());
} else {
res.send(JSON.stringify(result.rows));
}
});
});
var counter = 0;
app.get('/counter', function(req,res){
counter = counter + 1;
res.send(counter.toString());
});
app.get('/ui/style.css', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'style.css'));
});
var names = [];
app.get('/submit-name', function(req, res){ //URL: /submit-name?name=xxxx
// Get the name from the request
var name = req.query.name;
names.push(name);
// Json: Java script object notation
res.send(JSON.stringify(names));
});
app.get('/articles/:articleName',function (req, res) {
// articleName == article-one
// articles[articleName] == {} content for the object one
pool.query("SELECT * FROM article WHERE title= $1", [req.params.articleName] , function(err,result){
if (err) {
res.status(500).send(err,toString());
} else {
if (result.rows.length === 0) {
res.status(404).send('Article not found');
} else {
var articleData = result.rows[0];
res.send(createTemplate(articleData));
}
}
});
});
app.get('/ui/madi.png', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'madi.png'));
});
app.get('/ui/main.js', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'main.js'));
});
// 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}!`);
});