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server.js
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server.js
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var express = require('express');
var morgan = require('morgan');
var path = require('path');
var crypto = require('crypto');
var Pool = require('pg').Pool;
var config = {
user: 'enggupta26',
database: 'enggupta26',
host: 'db.imad.hasura-app.io',
port: '5432',
password: process.env.DB_PASSWORD
};
var app = express();
app.use(morgan('combined'));
function createTemplate (data) {
var title = data.title;
var heading = data.heading;
var date = data.date;
var content = data.content;
var htmlTemplate=`
<html>
<head>
<title>
${title}
</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link href="/ui/style.css" rel="stylesheet" />
</head>
<body>
<div class="container">
<div>
<a href="/">Home</a>
</div>
<hr/>
<h3>${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) {
var hashed = crypto.pbkdf2Sync(input, salt, 10000, 32, 'sha512');
return ["pbkdf2", salt, "10000", hashed.toString('hex')].join('$$');
}
app.get('/hash/:input', function(req, res) {
var hashedString = hash(req.params.input, 'this-is-a-random-string');
res.send(hashedString);
});
var pool = new Pool(config);
app.get('/test-db', function(req, res) {
//make a select request
//send a response with results
pool.query('SELECT * FROM testdb', 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());
});
var names = [];
app.get('/submit-name', function(req, res) {
var name = req.query.name;
names.push(name);
res.send(JSON.stringify(names));
});
app.get('/articles/:articleName', function (req, res) {
//This /: is a facility given by express framework to extract the 'part of path' as a variable from URL
//such that it can be indexed directly into an array of strings!!
var articleName = req.params.articleName;
//make a select request
//send a response with results
pool.query("SELECT * FROM articles WHERE title = $1", [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 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/main.js', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'main.js'));
});
app.get('/ui/madi.png', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'madi.png'));
});
// 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}!`);
});