First, let's create the user controller. Create a file at APPPATH/classes/controller/user.php and set its contents to:

<?php
class Controller_User extends Controller_Template
{

}

The home page, which will be handled by the index action of the User controller, displays the user's posts if the user is logged in, otherwise it will display the subscription and authentication forms.

Since we have no user in our system, nobody can log in. Thus, we will begin the subscription and authentication forms.

First, add the following method in the User controller:

public function action_index()
{
    if (false /* is the user logged ? */) {
        // @todo: handle response if user is logged.
    } else {
        $this->template->content = 
            View::forge(
                'user...