UserStorageCapabilityService.php

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<?php
namespace TYPO3\CMS\Core\Resource\Service;

use \TYPO3\CMS\Core\Resource\ResourceFactory;

class UserStorageCapabilityService {

    public function renderIsPublic(array $propertyArray, \TYPO3\CMS\Backend\Form\FormEngine $tceformsObj) {

        $isPublic = $GLOBALS['TCA']['sys_file_storage']['columns']['is_public']['config']['default'];
        $fileRecord = $propertyArray['row'];

        // Makes sure the storage object can be retrieved which is not the case when new storage.
        if ((int)$propertyArray['row']['uid'] > 0) {
            $storage = ResourceFactory::getInstance()->getStorageObject($fileRecord['uid']);
            $storageRecord = $storage->getStorageRecord();
            $isPublic = $storage->isPublic() && $storageRecord['is_public'];

            // Display a warning to the BE User in case settings is not inline with storage capability.
            if ($storageRecord['is_public'] && !$storage->isPublic()) {
                $message = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Messaging\\FlashMessage',
                    $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xlf:warning.message.storage_is_no_public'),
                    $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xlf:warning.header.storage_is_no_public'),
                    \TYPO3\CMS\Core\Messaging\FlashMessage::WARNING
                );

                \TYPO3\CMS\Core\Messaging\FlashMessageQueue::addMessage($message);
            }
        }

        return $this->renderFileInformationContent($fileRecord, $isPublic);
    }

    protected function renderFileInformationContent(array $fileRecord, $isPublic) {
        $template = '
        <div class="t3-form-field-item">
            <input name="data[sys_file_storage][{uid}][is_public]" value="0" type="hidden">
            <input class="checkbox" value="1" name="data[sys_file_storage][{uid}][is_public]_0" type="checkbox" %s>
        </div>';

        $content = sprintf($template,
            $isPublic ? 'checked="checked"' : ''
        );

        return str_replace('{uid}', $fileRecord['uid'], $content);
    }

}