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app.js
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app.js
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/**
* Module dependencies.
*/
var express = require('../..')
, hash = require('./pass').hash;
var app = module.exports = express();
// config
app.set('view engine', 'ejs');
app.set('views', __dirname + '/views');
// middleware
app.use(express.bodyParser());
app.use(express.cookieParser('shhhh, very secret'));
app.use(express.session());
// Session-persisted message middleware
app.use(function(req, res, next){
var err = req.session.error
, msg = req.session.success;
delete req.session.error;
delete req.session.success;
res.locals.message = '';
if (err) res.locals.message = '<p class="msg error">' + err + '</p>';
if (msg) res.locals.message = '<p class="msg success">' + msg + '</p>';
next();
});
// dummy database
var users = {
tj: { name: 'tj' }
};
// when you create a user, generate a salt
// and hash the password ('foobar' is the pass here)
hash('foobar', function(err, salt, hash){
if (err) throw err;
// store the salt & hash in the "db"
users.tj.salt = salt;
users.tj.hash = hash;
});
// Authenticate using our plain-object database of doom!
function authenticate(name, pass, fn) {
if (!module.parent) console.log('authenticating %s:%s', name, pass);
var user = users[name];
// query the db for the given username
if (!user) return fn(new Error('cannot find user'));
// apply the same algorithm to the POSTed password, applying
// the hash against the pass / salt, if there is a match we
// found the user
hash(pass, user.salt, function(err, hash){
if (err) return fn(err);
if (hash == user.hash) return fn(null, user);
fn(new Error('invalid password'));
})
}
function restrict(req, res, next) {
if (req.session.user) {
next();
} else {
req.session.error = 'Access denied!';
res.redirect('/login');
}
}
app.get('/', function(req, res){
res.redirect('login');
});
app.get('/restricted', restrict, function(req, res){
res.send('Wahoo! restricted area, click to <a href="/logout">logout</a>');
});
app.get('/logout', function(req, res){
// destroy the user's session to log them out
// will be re-created next request
req.session.destroy(function(){
res.redirect('/');
});
});
app.get('/login', function(req, res){
res.render('login');
});
app.post('/login', function(req, res){
authenticate(req.body.username, req.body.password, function(err, user){
if (user) {
// Regenerate session when signing in
// to prevent fixation
req.session.regenerate(function(){
// Store the user's primary key
// in the session store to be retrieved,
// or in this case the entire user object
req.session.user = user;
req.session.success = 'Authenticated as ' + user.name
+ ' click to <a href="/logout">logout</a>. '
+ ' You may now access <a href="/restricted">/restricted</a>.';
res.redirect('back');
});
} else {
req.session.error = 'Authentication failed, please check your '
+ ' username and password.'
+ ' (use "tj" and "foobar")';
res.redirect('login');
}
});
});
if (!module.parent) {
app.listen(3000);
console.log('Express started on port 3000');
}