learnosity-1.0.x-dev/src/Plugin/EntityReferenceSelection/LearnosityActivitySelection.php

<?php

namespace Drupal\learnosity\Plugin\EntityReferenceSelection;

use Drupal\Component\Utility\Html;
use Drupal\Core\Entity\EntityFieldManagerInterface;
use Drupal\Core\Entity\EntityReferenceSelection\SelectionPluginBase;
use Drupal\Core\Entity\EntityReferenceSelection\SelectionWithAutocreateInterface;
use Drupal\Core\Entity\EntityRepositoryInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\user\EntityOwnerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides specific access control for the learnosity activity entity type.
 *
 * @EntityReferenceSelection(
 *   id = "default:learnosity",
 *   label = @Translation("Learnosity activities"),
 *   entity_types = {"learnosity_activity"},
 *   group = "default",
 *   weight = 1
 * )
 */
class LearnosityActivitySelection extends SelectionPluginBase implements SelectionWithAutocreateInterface, ContainerFactoryPluginInterface {

  /**
   * The entity manager service.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * The module handler service.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

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

  /**
   * The entity field manager.
   *
   * @var \Drupal\Core\Entity\EntityFieldManagerInterface
   */
  protected $entityFieldManager;

  /**
   * The entity repository.
   *
   * @var \Drupal\Core\Entity\EntityRepositoryInterface
   */
  protected $entityRepository;

  /**
   * Constructs a new LearnosityActivitySelection object.
   *
   * @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\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity manager service.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler service.
   * @param \Drupal\Core\Session\AccountInterface $current_user
   *   The current user.
   * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
   *   The entity field manager.
   * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
   *   The entity repository.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityTypeManagerInterface $entity_type_manager, ModuleHandlerInterface $module_handler, AccountInterface $current_user, EntityFieldManagerInterface $entity_field_manager = NULL, EntityRepositoryInterface $entity_repository = NULL) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);

    $this->entityTypeManager = $entity_type_manager;
    $this->moduleHandler = $module_handler;
    $this->currentUser = $current_user;
    $this->entityFieldManager = $entity_field_manager;
    $this->entityRepository = $entity_repository;
  }

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

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      // For the 'target_bundles' setting, a NULL value is equivalent to "allow
      // entities from any bundle to be referenced" and an empty array value is
      // equivalent to "no entities from any bundle can be referenced".
      'target_type' => NULL,
      'handler' => $this->getPluginId(),
      'entity' => NULL,
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form['#markup'] = $this->t('No handler settings for this field type.');
    return $form;
  }

  /**
   * Builds an EntityQuery to get referenceable entities.
   *
   * @param string|null $match
   *   (Optional) Text to match the label against. Defaults to NULL.
   * @param string $match_operator
   *   (Optional) The operation the matching should be done with. Defaults
   *   to "CONTAINS".
   *
   * @return \Drupal\Core\Entity\Query\QueryInterface
   *   The EntityQuery object with the basic conditions and sorting applied to
   *   it.
   */
  protected function buildEntityQuery($match = NULL, $match_operator = 'CONTAINS') {
    // Removing the restriction on target bundles in the query. This was causing
    // a fatal error as well as restricting how the activity types could be
    // used. We are only using activity types to control how the player is
    // rendered to the user. It doesn't need the hard restriction like with
    // entity reference fields.
    $configuration = $this->getConfiguration();
    $target_type = $configuration['target_type'];
    $entity_type = $this->entityTypeManager->getDefinition($target_type);

    $query = $this->entityTypeManager->getStorage($target_type)->getQuery();
    $query->accessCheck(TRUE);

    if (isset($match) && $label_key = $entity_type->getKey('label')) {
      $query->condition($label_key, $match, $match_operator);
    }

    // Add entity-access tag.
    $query->addTag($target_type . '_access');

    // Add the Selection handler for system_query_entity_reference_alter().
    $query->addTag('entity_reference');
    $query->addMetaData('entity_reference_selection_handler', $this);

    return $query;
  }

  /**
   * {@inheritdoc}
   */
  public function getReferenceableEntities($match = NULL, $match_operator = 'CONTAINS', $limit = 0) {
    $target_type = $this->getConfiguration()['target_type'];

    $query = $this->buildEntityQuery($match, $match_operator);
    if ($limit > 0) {
      $query->range(0, $limit);
    }

    $result = $query->execute();

    if (empty($result)) {
      return [];
    }

    $options = [];
    $entities = $this->entityTypeManager->getStorage($target_type)->loadMultiple($result);
    foreach ($entities as $entity_id => $entity) {
      $options[$entity_id] = Html::escape($this->entityRepository->getTranslationFromContext($entity)->label());
    }

    return $options;
  }

  /**
   * {@inheritdoc}
   */
  public function validateReferenceableNewEntities(array $entities) {
    // We're always returning this as true because we don't need to
    // validate against bundles.
    return array_filter($entities, function ($entity) {
      return TRUE;
    });
  }

  /**
   * {@inheritdoc}
   */
  public function countReferenceableEntities($match = NULL, $match_operator = 'CONTAINS') {
    $query = $this->buildEntityQuery($match, $match_operator);
    return $query
      ->count()
      ->execute();
  }

  /**
   * {@inheritdoc}
   */
  public function createNewEntity($entity_type_id, $bundle, $label, $uid) {
    // Note: Bundle is deliberately not used because LearnosityActivity entity
    // does not support bundles.
    $entity_type = $this->entityTypeManager->getDefinition($entity_type_id);

    $values = [
      $entity_type->getKey('label') => $label,
    ];

    $entity = $this->entityTypeManager->getStorage($entity_type_id)->create($values);

    if ($entity instanceof EntityOwnerInterface) {
      $entity->setOwnerId($uid);
    }

    return $entity;
  }

  /**
   * {@inheritdoc}
   */
  public function validateReferenceableEntities(array $ids) {
    $result = [];
    if ($ids) {
      $target_type = $this->configuration['target_type'];
      $entity_type = $this->entityTypeManager->getDefinition($target_type);
      $query = $this->buildEntityQuery();
      $result = $query
        ->condition($entity_type->getKey('id'), $ids, 'IN')
        ->execute();
    }

    return $result;
  }

  /**
   * Form element validation handler; Filters the #value property of an element.
   */
  public static function elementValidateFilter(&$element, FormStateInterface $form_state) {
    // For single values (such as with select lists), make sure that it saves
    // it as an array.
    if (is_string($element['#value'])) {
      $element['#value'] = [$element['#value']];
    }
    else {
      $element['#value'] = array_filter($element['#value']);
    }
    $form_state->setValueForElement($element, $element['#value']);
  }

}