civicrm_entity-8.x-3.0-beta1/src/Plugin/TypedDataFilter/FirstDotLastFilter.php

<?php

namespace Drupal\civicrm_entity\Plugin\TypedDataFilter;

use Drupal\Core\Render\BubbleableMetadata;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\TypedData\DataDefinition;
use Drupal\Core\TypedData\DataDefinitionInterface;
use Drupal\typed_data\Attribute\DataFilter;
use Drupal\typed_data\DataFilterBase;

/**
 * A data filter which changes a string to upper case.
 *
 * @DataFilter(
 *   id = "firstdotlast",
 *   label = @Translation("Format username : firstname.lastname"),
 * )
 */
#[DataFilter(
  id: "firstdotlast",
  label: new TranslatableMarkup("Format username : firstname.lastname")
)]
class FirstDotLastFilter extends DataFilterBase {

  /**
   * {@inheritdoc}
   */
  public function canFilter(DataDefinitionInterface $definition) : bool {
    if ($definition->getConstraints()['EntityType'] == "civicrm_contact") {
      return TRUE;
    }
    else {
      return FALSE;
    }
    // Return is_subclass_of($definition->getClass(), StringInterface::class);.
  }

  /**
   * {@inheritdoc}
   */
  public function filtersTo(DataDefinitionInterface $definition, array $arguments) : DataDefinitionInterface {
    return DataDefinition::create('string');
  }

  /**
   * {@inheritdoc}
   */
  public function filter(DataDefinitionInterface $definition, $value, array $arguments, ?BubbleableMetadata $bubbleable_metadata = NULL) {
    $login = str_replace(' ', '', strtolower($value->get('first_name')->getString())) . '.' . strtolower($value->get('last_name')->getString());

    return filter_var($login, FILTER_SANITIZE_EMAIL);
  }

}