FolderStatus.php

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<?php
namespace TYPO3\CMS\Install\Controller\Action\Ajax;

class FolderStatus extends AbstractAjaxAction {

    protected function executeAction() {
        // Count of folder structure errors are displayed in left navigation menu
        $folderStructureFacade = $this->objectManager->get('TYPO3\\CMS\\Install\\FolderStructure\\DefaultFactory')->getStructure();
        $folderStatus = $folderStructureFacade->getStatus();

        $permissionCheck = $this->objectManager->get('TYPO3\\CMS\\Install\\FolderStructure\\DefaultPermissionsCheck');
        $folderStatus[] = $permissionCheck->getMaskStatus('fileCreateMask');
        $folderStatus[] = $permissionCheck->getMaskStatus('folderCreateMask');

        $statusUtility = $this->objectManager->get('TYPO3\\CMS\\Install\\Status\\StatusUtility');

        $folderStructureErrors = array_merge(
            $statusUtility->filterBySeverity($folderStatus, 'error'),
            $statusUtility->filterBySeverity($folderStatus, 'warning')
        );

        return count($folderStructureErrors);
    }
}