public function MediaRevisionAccessCheck::checkAccess in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/media/src/Access/MediaRevisionAccessCheck.php \Drupal\media\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.

File

core/modules/media/src/Access/MediaRevisionAccessCheck.php, line 92

Class

MediaRevisionAccessCheck

Provides an access checker for media item revisions.

Namespace

Drupal\media\Access

Code

public function checkAccess(MediaInterface $media, AccountInterface $account, $op = 'view') {
  if (!$media || $op !== 'view') {

    // 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 (!$account
      ->hasPermission('view all media revisions') && !$account
      ->hasPermission('administer media')) {
      $this->access[$cid] = FALSE;
      return FALSE;
    }

    // There should be at least two revisions. If the revision ID of the
    // given media item and the revision ID of the default revision differ,
    // then we already have two different revisions so there is no need for a
    // separate database check.
    if ($media
      ->isDefaultRevision() && $this
      ->countDefaultLanguageRevisions($media) == 1) {
      $this->access[$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];
}