Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\comment;
Chris@0: 
Chris@0: use Drupal\Core\Access\AccessResult;
Chris@0: use Drupal\Core\Field\FieldItemList;
Chris@0: use Drupal\Core\Session\AccountInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Defines a item list class for comment fields.
Chris@0:  */
Chris@0: class CommentFieldItemList extends FieldItemList {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function get($index) {
Chris@0:     // The Field API only applies the "field default value" to newly created
Chris@0:     // entities. In the specific case of the "comment status", though, we need
Chris@0:     // this default value to be also applied for existing entities created
Chris@0:     // before the comment field was added, which have no value stored for the
Chris@0:     // field.
Chris@0:     if ($index == 0 && empty($this->list)) {
Chris@0:       $field_default_value = $this->getFieldDefinition()->getDefaultValue($this->getEntity());
Chris@0:       return $this->appendItem($field_default_value[0]);
Chris@0:     }
Chris@0:     return parent::get($index);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function offsetExists($offset) {
Chris@0:     // For consistency with what happens in get(), we force offsetExists() to
Chris@0:     // be TRUE for delta 0.
Chris@0:     if ($offset === 0) {
Chris@0:       return TRUE;
Chris@0:     }
Chris@0:     return parent::offsetExists($offset);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function access($operation = 'view', AccountInterface $account = NULL, $return_as_object = FALSE) {
Chris@0:     if ($operation === 'edit') {
Chris@0:       // Only users with administer comments permission can edit the comment
Chris@0:       // status field.
Chris@0:       $result = AccessResult::allowedIfHasPermission($account ?: \Drupal::currentUser(), 'administer comments');
Chris@0:       return $return_as_object ? $result : $result->isAllowed();
Chris@0:     }
Chris@0:     if ($operation === 'view') {
Chris@17:       // Only users with "post comments" or "access comments" permission can
Chris@0:       // view the field value. The formatter,
Chris@0:       // Drupal\comment\Plugin\Field\FieldFormatter\CommentDefaultFormatter,
Chris@0:       // takes care of showing the thread and form based on individual
Chris@0:       // permissions, so if a user only has ‘post comments’ access, only the
Chris@0:       // form will be shown and not the comments.
Chris@0:       $result = AccessResult::allowedIfHasPermission($account ?: \Drupal::currentUser(), 'access comments')
Chris@0:         ->orIf(AccessResult::allowedIfHasPermission($account ?: \Drupal::currentUser(), 'post comments'));
Chris@0:       return $return_as_object ? $result : $result->isAllowed();
Chris@0:     }
Chris@0:     return parent::access($operation, $account, $return_as_object);
Chris@0:   }
Chris@0: 
Chris@0: }