<?php

/*

 * This file is part of the Symfony package.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Symfony\Bundle\SecurityBundle\Templating\Helper;

use Symfony\Component\Security\Acl\Voter\FieldVote;

use Symfony\Component\Templating\Helper\Helper;

use Symfony\Component\Security\Core\SecurityContextInterface;

/**

 * SecurityHelper provides read-only access to the security context.

 *

 * @author Fabien Potencier <fabien@symfony.com>

 */

class SecurityHelper extends Helper

{

    private $context;

    /**

     * Constructor.

     *

     * @param SecurityContextInterface $context A SecurityContext instance

     */

    public function __construct(SecurityContextInterface $context = null)

    {

        $this->context = $context;

    }

    public function isGranted($role, $object = null, $field = null)

    {

        if (null === $this->context) {

            return false;

        }

        if (null !== $field) {

            $object = new FieldVote($object, $field);

        }

        return $this->context->isGranted($role, $object);

    }

    /**

     * Returns the canonical name of this helper.

     *

     * @return string The canonical name

     */

    public function getName()

    {

        return 'security';

    }

}