--- /dev/null
+<?php
+
+namespace Drupal\taxonomy\Plugin\EntityReferenceSelection;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Core\Database\Query\SelectInterface;
+use Drupal\Core\Entity\Plugin\EntityReferenceSelection\DefaultSelection;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\taxonomy\Entity\Vocabulary;
+
+/**
+ * Provides specific access control for the taxonomy_term entity type.
+ *
+ * @EntityReferenceSelection(
+ * id = "default:taxonomy_term",
+ * label = @Translation("Taxonomy Term selection"),
+ * entity_types = {"taxonomy_term"},
+ * group = "default",
+ * weight = 1
+ * )
+ */
+class TermSelection extends DefaultSelection {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function entityQueryAlter(SelectInterface $query) {
+ // @todo: How to set access, as vocabulary is now config?
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+ $form = parent::buildConfigurationForm($form, $form_state);
+
+ $form['target_bundles']['#title'] = $this->t('Available Vocabularies');
+
+ // Sorting is not possible for taxonomy terms because we use
+ // \Drupal\taxonomy\TermStorageInterface::loadTree() to retrieve matches.
+ $form['sort']['#access'] = FALSE;
+
+ return $form;
+
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getReferenceableEntities($match = NULL, $match_operator = 'CONTAINS', $limit = 0) {
+ if ($match || $limit) {
+ $this->configuration['handler_settings']['sort'] = ['field' => 'name', 'direction' => 'asc'];
+ return parent::getReferenceableEntities($match, $match_operator, $limit);
+ }
+
+ $options = [];
+
+ $bundles = $this->entityManager->getBundleInfo('taxonomy_term');
+ $handler_settings = $this->configuration['handler_settings'];
+ $bundle_names = !empty($handler_settings['target_bundles']) ? $handler_settings['target_bundles'] : array_keys($bundles);
+
+ foreach ($bundle_names as $bundle) {
+ if ($vocabulary = Vocabulary::load($bundle)) {
+ if ($terms = $this->entityManager->getStorage('taxonomy_term')->loadTree($vocabulary->id(), 0, NULL, TRUE)) {
+ foreach ($terms as $term) {
+ $options[$vocabulary->id()][$term->id()] = str_repeat('-', $term->depth) . Html::escape($this->entityManager->getTranslationFromContext($term)->label());
+ }
+ }
+ }
+ }
+
+ return $options;
+ }
+
+}