FileIsImageConstraintValidator.php

<?php

declare (strict_types=1);
namespace Drupal\file\Plugin\Validation\Constraint;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Image\ImageFactory;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

/**
 * Validator for the FileIsImageConstraint.
 */
class FileIsImageConstraintValidator extends BaseFileConstraintValidator implements ContainerInjectionInterface {
    
    /**
     * Creates a new FileIsImageConstraintValidator.
     *
     * @param \Drupal\Core\Image\ImageFactory $imageFactory
     *   The image factory.
     */
    public function __construct(ImageFactory $imageFactory) {
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('image.factory'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function validate(mixed $value, Constraint $constraint) {
        $file = $this->assertValueIsFile($value);
        if (!$constraint instanceof FileIsImageConstraint) {
            throw new UnexpectedTypeException($constraint, FileIsImageConstraint::class);
        }
        $image = $this->imageFactory
            ->get($file->getFileUri());
        if (!$image->isValid()) {
            $supportedExtensions = $this->imageFactory
                ->getSupportedExtensions();
            $this->context
                ->addViolation($constraint->message, [
                '%types' => implode(', ', $supportedExtensions),
            ]);
        }
    }

}