computed_field-8.x-2.x-dev/tests/modules/test_computed_field_plugins/src/Plugin/ComputedField/TestCurrentUser.php

<?php

namespace Drupal\test_computed_field_plugins\Plugin\ComputedField;

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\computed_field\Attribute\ComputedField;
use Drupal\computed_field\Field\ComputedFieldDefinitionWithValuePluginInterface;
use Drupal\computed_field\Plugin\ComputedField\ComputedFieldBase;
use Drupal\computed_field\Plugin\ComputedField\SingleValueTrait;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Session\AccountProxyInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Computed field which shows the current user's name.
 */
#[ComputedField(
  id: 'test_current_user',
  label: new TranslatableMarkup('Test current user'),
  field_type: 'string',
)]
class TestCurrentUser extends ComputedFieldBase implements ContainerFactoryPluginInterface {

  /**
   * The current active user.
   *
   * @var \Drupal\Core\Session\AccountProxyInterface
   */
  protected $currentUser;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('current_user'),
    );
  }

  /**
   * Creates a TestCurrentUser instance.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Session\AccountProxyInterface $current_user
   *   The current active user.
   */
  public function __construct(
    array $configuration,
    $plugin_id,
    $plugin_definition,
    AccountProxyInterface $current_user
  ) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->currentUser = $current_user;
  }

  use SingleValueTrait;

  /**
   * {@inheritdoc}
   */
  public function singleComputeValue(EntityInterface $host_entity, ComputedFieldDefinitionWithValuePluginInterface $computed_field_definition): mixed {
    return \Drupal::currentUser()->getDisplayName();
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheability(EntityInterface $host_entity, ComputedFieldDefinitionWithValuePluginInterface $computed_field_definition): ?CacheableMetadata {
    $cacheability = new CacheableMetadata();
    $cacheability->setCacheContexts(['user']);
    $cacheability->setCacheTags(['user:' .  \Drupal::currentUser()->id()]);
    return $cacheability;
  }

}