Intent.go({route: 'login'});

Intent.return('login');

// if no user is signed in...
Intent.go({route: 'login'}, function(user) {
    if (!user) return;
    postComment();
});

// if the sign-in was successful
Intent.return('login', {
    arguments: [user]
});

Router.onBeforeAction(function(req, res, next) {

    // if user is not signed in...
        Intent.go({route: 'login'}, function(user) {
            if (user) next();
            else this.back();            
        }, {prevent_going_back: true});

}, {
    only: ['new-article']
});