LoginController.php

<?php
namespace Acme\Demo\Controller;

use TYPO3\FLOW3\Annotations as FLOW3;

/**
 * LoginController
 * Handles all stuff that has to do with the login
 */
class LoginController extends \TYPO3\FLOW3\Mvc\Controller\ActionController {

    /**
     * @var \TYPO3\FLOW3\Security\Authentication\AuthenticationManagerInterface
     * @FLOW3\Inject
     */
    protected $authenticationManager;

    /**
     * @var \TYPO3\FLOW3\Security\AccountRepository
     * @FLOW3\Inject
     */
    protected $accountRepository;

    /**
     * @var \TYPO3\FLOW3\Security\AccountFactory
     * @FLOW3\Inject
     */
    protected $accountFactory;

    /**
     * @var \TYPO3\FLOW3\Security\Context
     */
    protected $securityContext;

    /**
     * Injects the security context
     *
     * @param \TYPO3\FLOW3\Security\Context $securityContext The security context
     * @return void
     */
    public function injectSecurityContext(\TYPO3\FLOW3\Security\Context $securityContext) {
        $this->securityContext = $securityContext;
    }

    /**
     * Index action
     *
     * @return void
     */
    public function indexAction() {
        // example how to access account informations
        $account = $this->securityContext->getAccount()->getRoles();
        if($this->securityContext->hasRole('Visitor')){
            $isset = 'Is set!';
        }else{
            $isset = 'Is not set!';
        }
        $this->view->assign('roles', $account);
        $this->view->assign('isset', $isset);
    }

    /**
     * @throws \TYPO3\FLOW3\Security\Exception\AuthenticationRequiredException
     * @return void
     */
    public function authenticateAction() {
        try {
            $this->authenticationManager->authenticate();
            $this->flashMessageContainer->addMessage(new \TYPO3\FLOW3\Error\Error('Successfully logged in.'));
            $this->redirect('index', 'Login');
        } catch (\TYPO3\FLOW3\Security\Exception\AuthenticationRequiredException $exception) {
            $this->flashMessageContainer->addMessage(new \TYPO3\FLOW3\Error\Error('Wrong username or password.'));
            $this->flashMessageContainer->addMessage(new \TYPO3\FLOW3\Error\Error($exception->getMessage()));
            throw $exception;
        }
    }

    /**
     * @return void
     */
    public function registerAction() {
        // do nothing more than display the register form
    }

    /**
     * save the registration
     *
     * @param string $name
     * @param string $pass
     * @param string $pass2
     */
    public function createAction($name, $pass, $pass2) {

        $defaultRole = 'Visitor';

        if ($name == '' || strlen($name) < 3) {
            $this->flashMessageContainer->addMessage(new \TYPO3\FLOW3\Error\Error('Username too short or empty'));
            $this->redirect('register', 'Login');
        } else {
            if ($pass == '' || $pass != $pass2) {
                $this->flashMessageContainer->addMessage(new \TYPO3\FLOW3\Error\Error('Password too short or does not match'));
                $this->redirect('register', 'Login');
            } else {

                // create a account with password an add it to the accountRepository
                $account = $this->accountFactory->createAccountWithPassword($name, $pass, array($defaultRole));
                $this->accountRepository->add($account);

                // add a message and redirect to the login form
                $this->flashMessageContainer->addMessage(new \TYPO3\FLOW3\Error\Error('Account created. Please login.'));
                $this->redirect('index');
            }
        }

        // redirect to the login form
        $this->redirect('index', 'Login');
    }

    public function logoutAction() {
        $this->authenticationManager->logout();
        $this->flashMessageContainer->addMessage(new \TYPO3\FLOW3\Error\Error('Successfully logged out.'));
        $this->redirect('index', 'Login');
    }
}