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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\Security\Core\Authentication\Token\TokenInterface;
/**
* Voter is an abstract default implementation of a voter.
*
* @author Roman Marintšenko <inoryy@gmail.com>
* @author Grégoire Pineau <lyrixx@lyrixx.info>
*/
abstract class Voter implements VoterInterface
{
/**
* {@inheritdoc}
*/
public function vote(TokenInterface $token, $subject, array $attributes)
{
// abstain vote by default in case none of the attributes are supported
$vote = self::ACCESS_ABSTAIN;
foreach ($attributes as $attribute) {
if (!$this->supports($attribute, $subject)) {
continue;
}
// as soon as at least one attribute is supported, default is to deny access
$vote = self::ACCESS_DENIED;
if ($this->voteOnAttribute($attribute, $subject, $token)) {
// grant access as soon as at least one attribute returns a positive response
return self::ACCESS_GRANTED;
}
}
return $vote;
}
/**
* Determines if the attribute and subject are supported by this voter.
*
* @param string $attribute An attribute
* @param mixed $subject The subject to secure, e.g. an object the user wants to access or any other PHP type
*
* @return bool True if the attribute and subject are supported, false otherwise
*/
abstract protected function supports($attribute, $subject);
/**
* Perform a single access check operation on a given attribute, subject and token.
* It is safe to assume that $attribute and $subject already passed the "supports()" method check.
*
* @param string $attribute
* @param mixed $subject
* @param TokenInterface $token
*
* @return bool
*/
abstract protected function voteOnAttribute($attribute, $subject, TokenInterface $token);
}
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