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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: 'manu2k',
database: 'manu2k',
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 heading = data.heading;
var date = data.date;
var content = data.content;
var htmlTemplate = `
<html>
<head>
<title>
${title}
</title>
<meta name="viewport" content="width-device-width, intial-scale=1"/>
<link href="/ui/style.css" rel="stylesheet"/>
</head>
<body>
<div class="container">
<div>
<a href="/">"Home"</a>
</div>
<hr/>
<h3>${heading}</h3>
<div>
${date.toDateString()}
</div>
<div>
${content}
</div>
<hr/>
<div>
<h1>Comments:</h1>
<!--<textarea name='comment' id='comment'></textarea>
<br/>
<input type="text" id="feedback" placeholder="Provide comments here!"/>
<input type="submit" value="Enter" id="submit_button"/>-->
<div id="comment_form">
</div>
<div id="comments">
<center>Loading comments...</center>
</div>
</div>
</div>
<script type="text/javascript" src="/ui/article.js"></script>
</body>
</html>`;
return htmlTemplate;
}
function hash(input, salt){
var hashed = crypto.pbkdf2Sync(input, salt, 10000, 512, 'sha512');
return ['pbkdf2Sync','10000',salt,hashed.toString('hex')].join('$');
}
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){
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=$1',[username],function(err,result){
if (err){
res.status(500).send(err.toString());
} else {
if(result.rows.length===0){
res.send(403).send("username/password is invalid");
}
else {
var dbString = result.rows[0].password;
var salt = dbString.split('$')[2];
var hashedPassword = hash(password, salt);
console.log("server side user pwd");
console.log(hashedPassword);
concole.log(dbString);
if(hashedPassword === dbString){
//set the session
req.session.auth = {userId: result.rows[0].id};
res.send('Credentials are correct!');
} else {
res.send(403).send('username/password is invalid');
}
}
res.send("User successfully created: " + username);
}
});
});
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('/get-articles', function (req, res) {
// make a select request
// return a response with the results
pool.query('SELECT * FROM article ORDER BY date DESC', function (err, result) {
if (err) {
res.status(500).send(err.toString());
} else {
res.send(JSON.stringify(result.rows));
}
});
});
app.get('/get-comments/:articleName', function (req, res) {
// make a select request
// return a response with the results
pool.query('SELECT comment.*, "user".username FROM article, comment, "user" WHERE article.title = $1 AND article.id = comment.article_id AND comment.user_id = "user".id ORDER BY comment.timestamp DESC', [req.params.articleName], function (err, result) {
if (err) {
res.status(500).send(err.toString());
} else {
res.send(JSON.stringify(result.rows));
}
});
});
app.post('/submit-comment/:articleName', function (req, res) {
// Check if the user is logged in
if (req.session && req.session.auth && req.session.auth.userId) {
// First check if the article exists and get the article-id
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(400).send('Article not found');
} else {
var articleId = result.rows[0].id;
// Now insert the right comment for this article
pool.query(
"INSERT INTO comment (comment, article_id, user_id) VALUES ($1, $2, $3)",
[req.body.comment, articleId, req.session.auth.userId],
function (err, result) {
if (err) {
res.status(500).send(err.toString());
} else {
res.status(200).send('Comment inserted!');
}
});
}
}
});
} else {
res.status(403).send('Only logged in users can comment');
}
});
app.get('/articles/:articleName', function (req, res) {
// SELECT * FROM article WHERE title = '\'; DELETE WHERE a = \'asdf'
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/:fileName', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', req.params.fileName));
});
app.get('/test-db', function (req, res) {
pool.query('SELECT * FROM test', function(err, result){
if (err){
res.status(500).send(err.toString());
} else {
res.send(JSON.stringify(result.rows));
}
});
});
app.get('/', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'index.html'));
});
var counter = 0;
app.get('/counter', function(req,res){
counter = counter + 1;
res.send(counter.toString());
});
var names = [];
app.get('/submit-name', function (req,res){
//get the names from the request
var name =req.query.name;
names.push(name);
res.send(JSON.stringify(names));
});
var groupComments='';
app.get('/comments',function(req,res){
});
/*
app.get('/:articleName',function(req,res){
var articleName = req.params.articleName;
res.send(createTemplate(articles[articleName]));
});*/
app.get('/articles/:articleName',function(req,res){
//var articleName = req.params.articleName;
// res.send(createTemplate(articles[articleName]));
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.length === 0) {
res.status(404).send("Article not found");
} else {
var articleData = result.rows[0];
res.send(createTemplate(articleData));
}
}
});
});
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'));
});
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}!`);
});