XMen XMen - 1 month ago 8
Node.js Question

how to implement login auth in node.js

I have this node server running :

var server=http.createServer(function(request, responsehttp) {
if (request.method == 'POST') {
var body = '';
request.on('data', function (data) {
body += data;
});
request.on('end', function () {
var POST = qs.parse(body);
processquery(POST, request, responsehttp);
});
} else {
var url_parts = url.parse(request.url, true);
var query = url_parts.query;
console.log(query);
processquery(query, request, responsehttp);
}
});


I want to add login form for this server .so when user is authenticated then it will show .

function processquery(query, request, responsehttp){
var returnResult = function (data){
responsehttp.end(JSON.stringify(data));
};

if (!query.command) {
fileprocess(request, responsehttp);
}
responsehttp.writeHead(200, {"Content-Type": "application/json"});
switch(query.command) {
case 'logout':
logout(query, returnResult);
break;
case 'login':
login(query, returnResult);
break;
}
}


in process query function returning the files to client if any command is not given ,
so i can send the login command from client to server , but what server should do when it recieve the login command with username password , how it should hand the login request and return the login sucess or failure, for writing this part i need help .

what i tried .

function login(request, callback) {
if(request.username==users[request.username] && request.password==users[request.username].password) {
users[request.username].auth=true;
var data = {result:'success','message':'login successful'};
callback(data);
} else {
var data = {result:'error','message':'login incorrect'};
callback(data);
}
}


Please suggest how can i add session in this i tried adding , request variable in login function and tried setting request.session variable it says request.session is undefined .

Please suggest how can i write this login module which can maintain login authentication properly for every user .

Answer

Here's how I do it with Express.js:

1) Check if the user is authenticated: I have a middleware function named CheckAuth which I use on every route that needs the user to be authenticated:

function checkAuth(req, res, next) {
  if (!req.session.user_id) {
    res.send('You are not authorized to view this page');
  } else {
    next();
  }
}

I use this function in my routes like this:

app.get('/my_secret_page', checkAuth, function (req, res) {
  res.send('if you are viewing this page it means you are logged in');
});

2) The login route:

app.post('/login', function (req, res) {
  var post = req.body;
  if (post.user === 'john' && post.password === 'johnspassword') {
    req.session.user_id = johns_user_id_here;
    res.redirect('/my_secret_page');
  } else {
    res.send('Bad user/pass');
  }
});

3) The logout route:

app.get('/logout', function (req, res) {
  delete req.session.user_id;
  res.redirect('/login');
});      

If you want to learn more about Express.js check their site here: expressjs.com/en/guide/routing.html If there's need for more complex stuff, checkout everyauth (it has a lot of auth methods available, for facebook, twitter etc; good tutorial on it here).