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<?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\ExpressionLanguage\Expression; use Symfony\Component\HttpFoundation\Request; use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface; use Symfony\Component\Security\Core\Authentication\Token\TokenInterface; use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface; use Symfony\Component\Security\Core\Authorization\ExpressionLanguage; use Symfony\Component\Security\Core\Role\RoleHierarchyInterface; /** * ExpressionVoter votes based on the evaluation of an expression. * * @author Fabien Potencier <fabien@symfony.com> */ class ExpressionVoter implements CacheableVoterInterface { public function __construct( private ExpressionLanguage $expressionLanguage, private AuthenticationTrustResolverInterface $trustResolver, private AuthorizationCheckerInterface $authChecker, private ?RoleHierarchyInterface $roleHierarchy = null, ) { } public function supportsAttribute(string $attribute): bool { return false; } public function supportsType(string $subjectType): bool { return true; } public function vote(TokenInterface $token, mixed $subject, array $attributes): int { $result = VoterInterface::ACCESS_ABSTAIN; $variables = null; foreach ($attributes as $attribute) { if (!$attribute instanceof Expression) { continue; } $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, mixed $subject): array { $roleNames = $token->getRoleNames(); if (null !== $this->roleHierarchy) { $roleNames = $this->roleHierarchy->getReachableRoleNames($roleNames); } $variables = [ 'token' => $token, 'user' => $token->getUser(), 'object' => $subject, 'subject' => $subject, 'role_names' => $roleNames, 'trust_resolver' => $this->trustResolver, 'auth_checker' => $this->authChecker, ]; // this is mainly to propose a better experience when the expression is used // in an access control rule, as the developer does not know that it's going // to be handled by this voter if ($subject instanceof Request) { $variables['request'] = $subject; } return $variables; } }
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