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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 Pool = require('pg').Pool;
var crypto= require('crypto');
var bodyParser = require('body-parser');
var session = require('express-session');
var config ={
user: 'santhanalakshmimano',
database: 'santhanalakshmimano',
host: 'db.imad.hasura-app.io',
port:'5432',
password: 'db-santhanalakshmimano-67'
};
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="cont">
<div>
<a href="/">Home</a>
</div>
<br/>
<h3>
${heading}
</h3>
<div>
${date.toDateString()}
</div>
<div>
${content}
</div>
</div>
</body>
</html>
`;
return htmlTemplate;
}
app.get('/', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'index.html'));
});
function hash(input,salt)
{
//How do we create a hash?
var hashed = crypto.pbkdf2Sync(input,salt,10000,512,'sha512');
return ["pbkdf2","10000",salt,hashed.toString('hex')].join('$');
}
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
// {"username": "santhanalakshmimano", "password" : "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= $1',[username], function (err,result) {
if(err)
{
res.status(500).send(err.toString());
}else
{
if(result.rows.length===0){
res.send(403).send('username/password is invalid');
}
else{
//Match the password
var dbString = result.rows[0].password;
var salt= dbString.split('$')[2];
var hashedPassword= hash(password, salt); //Creating a hash based on the password submitted and the original salt
if(hashedPassword === dbString){
//Set the session
req.session.outh ={userId: result.rows[0].id};
//set cookie with a session id
//internally, on the server side, it maps the session id to an object
//{outh: {userId}}
res.send('credentials correct!');
}else{
res.send(403).send('username/password is invalid');
}
}
}
});
});
app.get('/check-login',function(req,res){
if(req.session && req.session.outh && req.session.outh.userId){
res.send('You are logged in:'+ req.session.outh.userId.toString());
}else{
res.send('You are not logged in');
}
});
app.get('/logout',function(req,res)
{
delete req.session.outh;
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 results
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());
});
var names=[];
app.get('/submit-name',function(req,res)
{ //URL: /submit-name?name=xxxxx
//Get the name from the request
var name=req.query.name;
names.push(name);
//JSON: JavaScript Object Notation
res.send(JSON.stringify(names));
});
app.get('/articles/:articleName',function(req,res)
{
//articleName==article-one
//articles[articleName]=={} content object for article one
//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/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'));
});
var port = 8080; // Use 8080 for local development because you might already have apache running on 8080
app.listen(8080, function (){
console.log(`IMAD course app listening on port ${port}!`);
});