function FileAccessControlHandler::checkAccess

Overrides EntityAccessControlHandler::checkAccess

File

core/modules/file/src/FileAccessControlHandler.php, line 21

Class

FileAccessControlHandler

Provides a File access control handler.

Namespace

Code

protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
    
    /** @var \Drupal\file\FileInterface $entity */
    if ($operation == 'download' || $operation == 'view') {
        if (\Drupal::service('stream_wrapper_manager')->getScheme($entity->getFileUri()) === 'public') {
            if ($operation === 'download') {
                return AccessResult::allowed();
            }
            else {
                return AccessResult::allowedIfHasPermission($account, 'access content');
            }
        }
        elseif ($references = $this->getFileReferences($entity)) {
            foreach ($references as $field_name => $entity_map) {
                foreach ($entity_map as $referencing_entities) {
                    
                    /** @var \Drupal\Core\Entity\EntityInterface $referencing_entity */
                    foreach ($referencing_entities as $referencing_entity) {
                        $entity_and_field_access = $referencing_entity->access('view', $account, TRUE)
                            ->andIf($referencing_entity->{$field_name}
                            ->access('view', $account, TRUE));
                        if ($entity_and_field_access->isAllowed()) {
                            return $entity_and_field_access;
                        }
                    }
                }
            }
        }
        elseif ($entity->getOwnerId() == $account->id()) {
            // This case handles new nodes, or detached files. The user who uploaded
            // the file can access it even if it's not yet used.
            if ($account->isAnonymous()) {
                // For anonymous users, only the browser session that uploaded the
                // file is positively allowed access to it. See file_save_upload().
                // @todo Implement \Drupal\Core\Entity\EntityHandlerInterface so that
                //   services can be more properly injected.
                $allowed_fids = \Drupal::service('session')->get('anonymous_allowed_file_ids', []);
                if (!empty($allowed_fids[$entity->id()])) {
                    return AccessResult::allowed()->addCacheContexts([
                        'session',
                        'user',
                    ]);
                }
            }
            else {
                return AccessResult::allowed()->addCacheContexts([
                    'user',
                ]);
            }
        }
    }
    if ($operation == 'delete' || $operation == 'update') {
        $account = $this->prepareUser($account);
        $file_uid = $entity->get('uid')
            ->getValue();
        // Only the file owner can update or delete the file entity.
        if ($account->id() == $file_uid[0]['target_id']) {
            return AccessResult::allowed();
        }
        return AccessResult::forbidden('Only the file owner can update or delete the file entity.');
    }
    // No opinion.
    return AccessResult::neutral();
}