Classes List

Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter

 1 
 2 
 3 
 4 
 5 
 6 
 7 
 8 
 9 
 10 
 11 
 12 
 13 
 14 
 15 
 16 
 17 
 18 
 19 
 20 
 21 
 22 
 23 
 24 
 25 
 26 
 27 
 28 
 29 
 30 
 31 
 32 
 33 
 34 
 35 
 36 
 37 
 38 
 39 
 40 
 41 
 42 
 43 
 44 
 45 
 46 
 47 
 48 
 49 
 50 
 51 
 52 
 53 
 54 
 55 
 56 
 57 
 58 
 59 
 60 
 61 
 62 
 63 
 64 
 65 
 66 
 67 
 68 
 69 
 70 
 71 
 72 
 73 
 74 
 75 
 76 
 77 
 78 
 79 
 80 
 81 
 82 
 83 
 84 
 85 
 86 
 87 
 88 
 89 
 90 
 91 
 92 
 93 
 94 
 95 
 96 
 97 
<?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\Component\Security\Core\Authorization\Voter;

use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface;
use Symfony\Component\Security\Core\Authorization\ExpressionLanguage;
use Symfony\Component\Security\Core\Role\RoleHierarchyInterface;
use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
use Symfony\Component\ExpressionLanguage\Expression;
use Symfony\Component\HttpFoundation\Request;

/** * ExpressionVoter votes based on the evaluation of an expression. * * @author Fabien Potencier <fabien@symfony.com> */
class ExpressionVoter implements VoterInterface
{
    private $expressionLanguage;
    private $trustResolver;
    private $roleHierarchy;

    public function __construct(ExpressionLanguage $expressionLanguageAuthenticationTrustResolverInterface $trustResolverRoleHierarchyInterface $roleHierarchy = null)
    {
        $this->expressionLanguage = $expressionLanguage;
        $this->trustResolver = $trustResolver;
        $this->roleHierarchy = $roleHierarchy;
    }

    public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider)
    {
        $this->expressionLanguage->registerProvider($provider);
    }

    /** * {@inheritdoc} */
    public function vote(TokenInterface $token$subjectarray $attributes)
    {
        $result = VoterInterface::ACCESS_ABSTAIN;
        $variables = null;
        foreach ($attributes as $attribute) {
            if (!$attribute instanceof Expression) {
                continue;
            }

            if (null === $variables) {
                $variables = $this->getVariables($token$subject);
            }

            $result = VoterInterface::ACCESS_DENIED;
            if ($this->expressionLanguage->evaluate($attribute$variables)) {
                return VoterInterface::ACCESS_GRANTED;
            }
        }

        return $result;
    }

    private function getVariables(TokenInterface $token$subject)
    {
        if (null !== $this->roleHierarchy) {
            $roles = $this->roleHierarchy->getReachableRoles($token->getRoles());
        } else {
            $roles = $token->getRoles();
        }

        $variables = array(
            'token' => $token,
            'user' => $token->getUser(),
            'object' => $subject,
            'subject' => $subject,
            'roles' => array_map(function ($role) { return $role->getRole(); }, $roles),
            'trust_resolver' => $this->trustResolver,
        );

        // this is mainly to propose a better experience when the expression is used
        // in an access control rule, as the developer does not know that it's going
        // to be handled by this voter
        if ($subject instanceof Request) {
            $variables['request'] = $subject;
        }

        return $variables;
    }
}