public function MediaRevisionAccessCheck::checkAccess in Media Revisions UI 8

Same name and namespace in other branches

1. 2.0.x src/Access/MediaRevisionAccessCheck.php \Drupal\media_revisions_ui\Access\MediaRevisionAccessCheck::checkAccess()

Checks media item revision access.

Parameters

\Drupal\media\MediaInterface $media: The media item to check.

\Drupal\Core\Session\AccountInterface $account: A user object representing the user for whom the operation is to be performed.

string $op: (optional) The specific operation being checked. Defaults to 'view'.

Return value

bool TRUE if the operation may be performed, FALSE otherwise.

Overrides MediaRevisionAccessCheck::checkAccess

File

src/Access/MediaRevisionAccessCheck.php, line 52

Class

MediaRevisionAccessCheck

Provides an access checker for media item revisions.

Namespace

Drupal\media_revisions_ui\Access

Code

public function checkAccess(MediaInterface $media, AccountInterface $account, $op = 'view') {
  $bundle = $media
    ->bundle();
  $operations = [
    'view' => 'view all media revisions',
    'update' => 'revert all media revisions',
    'delete' => 'delete all media revisions',
  ];
  $bundleOperations = [
    'view' => "view {$bundle} media revisions",
    'update' => "revert {$bundle} media revisions",
    'delete' => "delete {$bundle} media revisions",
  ];
  if (!$media || !isset($operations[$op]) || !isset($bundleOperations[$op])) {

    // If there was no media to check against, or the $op was not one of the
    // supported ones, we return access denied.
    return FALSE;
  }

  // Statically cache access by revision ID, language code, user account ID,
  // and operation.
  $langcode = $media
    ->language()
    ->getId();
  $cid = $media
    ->getRevisionId() . ':' . $langcode . ':' . $account
    ->id() . ':' . $op;
  if (!isset($this->access[$cid])) {

    // Perform basic permission checks first.
    if (!$account
      ->hasPermission($operations[$op]) && !$account
      ->hasPermission($bundleOperations[$op]) && !$account
      ->hasPermission('administer media')) {
      $this->access[$cid] = FALSE;
      return FALSE;
    }
    $mediaType = $media
      ->getEntityType()
      ->getBundleEntityType();

    /** @var \Drupal\media\MediaTypeInterface $mediaTypeEntity */
    $mediaTypeEntity = $this->entityTypeManager
      ->getStorage($mediaType)
      ->load($media
      ->bundle());

    // If the revisions checkbox is selected for the media type, display the
    // revisions tab.
    if ($mediaTypeEntity
      ->shouldCreateNewRevision() && $op === 'view') {
      $this->access[$cid] = TRUE;
    }
    else {

      // There should be at least two revisions. If the vid of the given media
      // and the vid of the default revision differ, then we already have two
      // different revisions so there is no need for a separate database
      // check. Also, if you try to revert to or delete the default revision,
      // that's not good.
      if ($media
        ->isDefaultRevision() && ($this
        ->countDefaultLanguageRevisions($media) == 1 || $op === 'update' || $op === 'delete')) {
        $this->access[$cid] = FALSE;
      }
      elseif ($account
        ->hasPermission('administer media')) {
        $this->access[$cid] = TRUE;
      }
      else {

        // First check the access to the default revision and finally, if the
        // media passed in is not the default revision then access to that,
        // too.
        $this->access[$cid] = $this->mediaAccess
          ->access($this->mediaStorage
          ->load($media
          ->id()), $op, $account) && ($media
          ->isDefaultRevision() || $this->mediaAccess
          ->access($media, $op, $account));
      }
    }
  }
  return $this->access[$cid];
}