<?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 App\Security;
use App\Entity\Post;
use App\Entity\User;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\Authorization\Voter\Voter;
/**
* It grants or denies permissions for actions related to blog posts (such as
* showing, editing and deleting posts).
*
* See https://symfony.com/doc/current/security/voters.html
*
* @author Yonel Ceruto <yonelceruto@gmail.com>
*/
class PostVoter extends Voter
{
// Defining these constants is overkill for this simple application, but for real
// applications, it's a recommended practice to avoid relying on "magic strings"
public const DELETE = 'delete';
public const EDIT = 'edit';
public const SHOW = 'show';
/**
* {@inheritdoc}
*/
protected function supports(string $attribute, $subject): bool
{
// this voter is only executed for three specific permissions on Post objects
return $subject instanceof Post && \in_array($attribute, [self::SHOW, self::EDIT, self::DELETE], true);
}
/**
* {@inheritdoc}
*
* @param Post $post
*/
protected function voteOnAttribute(string $attribute, $post, TokenInterface $token): bool
{
$user = $token->getUser();
// the user must be logged in; if not, deny permission
if (!$user instanceof User) {
return false;
}
// the logic of this voter is pretty simple: if the logged user is the
// author of the given blog post, grant permission; otherwise, deny it.
// (the supports() method guarantees that $post is a Post object)
return $user === $post->getAuthor();
}
}