AllowedValuesConstraintValidator.php

<?php

namespace Drupal\Core\Validation\Plugin\Validation\Constraint;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\TypedData\OptionsProviderInterface;
use Drupal\Core\TypedData\ComplexDataInterface;
use Drupal\Core\TypedData\PrimitiveInterface;
use Drupal\Core\TypedData\Validation\TypedDataAwareValidatorTrait;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\Constraints\ChoiceValidator;
use Symfony\Component\Validator\Exception\ConstraintDefinitionException;

/**
 * Validates the AllowedValues constraint.
 */
class AllowedValuesConstraintValidator extends ChoiceValidator implements ContainerInjectionInterface {
    use TypedDataAwareValidatorTrait;
    
    /**
     * The current user.
     *
     * @var \Drupal\Core\Session\AccountInterface
     */
    protected $currentUser;
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('current_user'));
    }
    
    /**
     * Constructs a new AllowedValuesConstraintValidator.
     *
     * @param \Drupal\Core\Session\AccountInterface $current_user
     *   The current user.
     */
    public function __construct(AccountInterface $current_user) {
        $this->currentUser = $current_user;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validate($value, Constraint $constraint) : void {
        $typed_data = $this->getTypedData();
        if ($typed_data instanceof OptionsProviderInterface) {
            $allowed_values = $typed_data->getSettableValues($this->currentUser);
            $constraint->choices = $allowed_values;
            // If the data is complex, we have to validate its main property.
            if ($typed_data instanceof ComplexDataInterface) {
                $name = $typed_data->getDataDefinition()
                    ->getMainPropertyName();
                if (!isset($name)) {
                    throw new \LogicException('Cannot validate allowed values for complex data without a main property.');
                }
                $typed_data = $typed_data->get($name);
                $value = $typed_data->getValue();
            }
        }
        // The parent implementation ignores values that are not set, but makes
        // sure some choices are available firstly. However, we want to support
        // empty choices for undefined values; for instance, if a term reference
        // field points to an empty vocabulary.
        if (!isset($value)) {
            return;
        }
        // Get the value with the proper datatype in order to make strict
        // comparisons using in_array().
        if (!$typed_data instanceof PrimitiveInterface) {
            throw new \LogicException('The data type must be a PrimitiveInterface at this point.');
        }
        $value = $typed_data->getCastedValue();
        // In a better world where typed data just returns typed values, we could
        // set a constraint callback to use the OptionsProviderInterface.
        // This is not possible right now though because we do the typecasting
        // further down.
        if ($constraint->callback) {
            if (!\is_callable($choices = [
                $this->context
                    ->getObject(),
                $constraint->callback,
            ]) && !\is_callable($choices = [
                $this->context
                    ->getClassName(),
                $constraint->callback,
            ]) && !\is_callable($choices = $constraint->callback)) {
                throw new ConstraintDefinitionException('The AllowedValuesConstraint constraint expects a valid callback');
            }
            $allowed_values = \call_user_func($choices);
            $constraint->choices = $allowed_values;
            // parent::validate() does not need to invoke the callback again.
            $constraint->callback = NULL;
        }
        // Force the choices to be the same type as the value.
        $type = gettype($value);
        foreach ($constraint->choices as &$choice) {
            settype($choice, $type);
        }
        parent::validate($value, $constraint);
    }

}