vendor/symfony/symfony/src/Symfony/Component/Security/Core/Authorization/Voter/ExpressionVoter.php line 27

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  1. <?php
  3. /*
  4.  * This file is part of the Symfony package.
  5.  *
  6.  * (c) Fabien Potencier <fabien@symfony.com>
  7.  *
  8.  * For the full copyright and license information, please view the LICENSE
  9.  * file that was distributed with this source code.
  10.  */
  12. namespace Symfony\Component\Security\Core\Authorization\Voter;
  14. use Symfony\Component\ExpressionLanguage\Expression;
  15. use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
  16. use Symfony\Component\HttpFoundation\Request;
  17. use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface;
  18. use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
  19. use Symfony\Component\Security\Core\Authorization\ExpressionLanguage;
  20. use Symfony\Component\Security\Core\Role\RoleHierarchyInterface;
  22. /**
  23.  * ExpressionVoter votes based on the evaluation of an expression.
  24.  *
  25.  * @author Fabien Potencier <fabien@symfony.com>
  26.  */
  27. class ExpressionVoter implements VoterInterface
  28. {
  29.     private $expressionLanguage;
  30.     private $trustResolver;
  31.     private $roleHierarchy;
  33.     public function __construct(ExpressionLanguage $expressionLanguage, AuthenticationTrustResolverInterface $trustResolver, RoleHierarchyInterface $roleHierarchy = null)
  34.     {
  35.         $this->expressionLanguage = $expressionLanguage;
  36.         $this->trustResolver = $trustResolver;
  37.         $this->roleHierarchy = $roleHierarchy;
  38.     }
  40.     public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider)
  41.     {
  42.         $this->expressionLanguage->registerProvider($provider);
  43.     }
  45.     /**
  46.      * {@inheritdoc}
  47.      */
  48.     public function vote(TokenInterface $token, $subject, array $attributes)
  49.     {
  50.         $result = VoterInterface::ACCESS_ABSTAIN;
  51.         $variables = null;
  52.         foreach ($attributes as $attribute) {
  53.             if (!$attribute instanceof Expression) {
  54.                 continue;
  55.             }
  57.             if (null === $variables) {
  58.                 $variables = $this->getVariables($token, $subject);
  59.             }
  61.             $result = VoterInterface::ACCESS_DENIED;
  62.             if ($this->expressionLanguage->evaluate($attribute, $variables)) {
  63.                 return VoterInterface::ACCESS_GRANTED;
  64.             }
  65.         }
  67.         return $result;
  68.     }
  70.     private function getVariables(TokenInterface $token, $subject)
  71.     {
  72.         if (null !== $this->roleHierarchy) {
  73.             $roles = $this->roleHierarchy->getReachableRoles($token->getRoles());
  74.         } else {
  75.             $roles = $token->getRoles();
  76.         }
  78.         $variables = [
  79.             'token' => $token,
  80.             'user' => $token->getUser(),
  81.             'object' => $subject,
  82.             'subject' => $subject,
  83.             'roles' => array_map(function ($role) { return $role->getRole(); }, $roles),
  84.             'trust_resolver' => $this->trustResolver,
  85.         ];
  87.         // this is mainly to propose a better experience when the expression is used
  88.         // in an access control rule, as the developer does not know that it's going
  89.         // to be handled by this voter
  90.         if ($subject instanceof Request) {
  91.             $variables['request'] = $subject;
  92.         }
  94.         return $variables;
  95.     }
  96. }