ResourceStorage.php

<?php

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Core\Resource;

use Psr\EventDispatcher\EventDispatcherInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\Core\Environment;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Http\ApplicationType;
use TYPO3\CMS\Core\Http\FalDumpFileContentsDecoratorStream;
use TYPO3\CMS\Core\Http\Response;
use TYPO3\CMS\Core\Log\LogManager;
use TYPO3\CMS\Core\Registry;
use TYPO3\CMS\Core\Resource\Driver\DriverInterface;
use TYPO3\CMS\Core\Resource\Driver\StreamableDriverInterface;
use TYPO3\CMS\Core\Resource\Event\AfterFileAddedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFileContentsSetEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFileCopiedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFileCreatedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFileDeletedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFileMovedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFileRenamedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFileReplacedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFolderAddedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFolderCopiedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFolderDeletedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFolderMovedEvent;
use TYPO3\CMS\Core\Resource\Event\AfterFolderRenamedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileAddedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileContentsSetEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileCopiedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileCreatedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileDeletedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileMovedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileRenamedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFileReplacedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFolderAddedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFolderCopiedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFolderDeletedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFolderMovedEvent;
use TYPO3\CMS\Core\Resource\Event\BeforeFolderRenamedEvent;
use TYPO3\CMS\Core\Resource\Event\GeneratePublicUrlForResourceEvent;
use TYPO3\CMS\Core\Resource\Event\SanitizeFileNameEvent;
use TYPO3\CMS\Core\Resource\Exception\ExistingTargetFileNameException;
use TYPO3\CMS\Core\Resource\Exception\ExistingTargetFolderException;
use TYPO3\CMS\Core\Resource\Exception\FileOperationErrorException;
use TYPO3\CMS\Core\Resource\Exception\FolderDoesNotExistException;
use TYPO3\CMS\Core\Resource\Exception\IllegalFileExtensionException;
use TYPO3\CMS\Core\Resource\Exception\InsufficientFileAccessPermissionsException;
use TYPO3\CMS\Core\Resource\Exception\InsufficientFileReadPermissionsException;
use TYPO3\CMS\Core\Resource\Exception\InsufficientFileWritePermissionsException;
use TYPO3\CMS\Core\Resource\Exception\InsufficientFolderAccessPermissionsException;
use TYPO3\CMS\Core\Resource\Exception\InsufficientFolderWritePermissionsException;
use TYPO3\CMS\Core\Resource\Exception\InsufficientUserPermissionsException;
use TYPO3\CMS\Core\Resource\Exception\InvalidConfigurationException;
use TYPO3\CMS\Core\Resource\Exception\InvalidHashException;
use TYPO3\CMS\Core\Resource\Exception\InvalidTargetFolderException;
use TYPO3\CMS\Core\Resource\Exception\ResourcePermissionsUnavailableException;
use TYPO3\CMS\Core\Resource\Exception\UploadException;
use TYPO3\CMS\Core\Resource\Exception\UploadSizeException;
use TYPO3\CMS\Core\Resource\Filter\ImportExportFilter;
use TYPO3\CMS\Core\Resource\Index\FileIndexRepository;
use TYPO3\CMS\Core\Resource\Index\Indexer;
use TYPO3\CMS\Core\Resource\OnlineMedia\Helpers\OnlineMediaHelperRegistry;
use TYPO3\CMS\Core\Resource\Search\FileSearchDemand;
use TYPO3\CMS\Core\Resource\Search\Result\DriverFilteredSearchResult;
use TYPO3\CMS\Core\Resource\Search\Result\EmptyFileSearchResult;
use TYPO3\CMS\Core\Resource\Search\Result\FileSearchResult;
use TYPO3\CMS\Core\Resource\Search\Result\FileSearchResultInterface;
use TYPO3\CMS\Core\Resource\Security\FileNameValidator;
use TYPO3\CMS\Core\Resource\Service\FileProcessingService;
use TYPO3\CMS\Core\Service\FlexFormService;
use TYPO3\CMS\Core\Utility\Exception\NotImplementedMethodException;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\PathUtility;
use TYPO3\CMS\Core\Utility\StringUtility;

/**
 * A "mount point" inside the TYPO3 file handling.
 *
 * A "storage" object handles
 * - abstraction to the driver
 * - permissions (from the driver, and from the user, + capabilities)
 * - an entry point for files, folders, and for most other operations
 *
 * == Driver entry point
 * The driver itself, that does the actual work on the file system,
 * is inside the storage but completely shadowed by
 * the storage, as the storage also handles the abstraction to the
 * driver
 *
 * The storage can be on the local system, but can also be on a remote
 * system. The combination of driver + configurable capabilities (storage
 * is read-only e.g.) allows for flexible uses.
 *
 *
 * == Permission system
 * As all requests have to run through the storage, the storage knows about the
 * permissions of a BE/FE user, the file permissions / limitations of the driver
 * and has some configurable capabilities.
 * Additionally, a BE user can use "filemounts" (known from previous installations)
 * to limit his/her work-zone to only a subset (identifier and its subfolders/subfolders)
 * of the user itself.
 *
 * Check 1: "User Permissions" [is the user allowed to write a file) [is the user allowed to write a file]
 * Check 2: "File Mounts" of the User (act as subsets / filters to the identifiers) [is the user allowed to do something in this folder?]
 * Check 3: "Capabilities" of Storage (then: of Driver) [is the storage/driver writable?]
 * Check 4: "File permissions" of the Driver [is the folder writable?]
 */
class ResourceStorage implements ResourceStorageInterface
{
    /**
     * The storage driver instance belonging to this storage.
     *
     * @var Driver\DriverInterface
     */
    protected $driver;

    /**
     * The database record for this storage
     *
     * @var array
     */
    protected $storageRecord;

    /**
     * The configuration belonging to this storage (decoded from the configuration field).
     *
     * @var array
     */
    protected $configuration;

    /**
     * @var Service\FileProcessingService
     */
    protected $fileProcessingService;

    /**
     * Whether to check if file or folder is in user mounts
     * and the action is allowed for a user
     * Default is FALSE so that resources are accessible for
     * front end rendering or admins.
     *
     * @var bool
     */
    protected $evaluatePermissions = false;

    /**
     * User filemounts, added as an array, and used as filters
     *
     * @var array
     */
    protected $fileMounts = [];

    /**
     * The file permissions of the user (and their group) merged together and
     * available as an array
     *
     * @var array
     */
    protected $userPermissions = [];

    /**
     * The capabilities of this storage as defined in the storage record.
     * Also see the CAPABILITY_* constants below
     *
     * @var int
     */
    protected $capabilities;

    /**
     * @var EventDispatcherInterface
     */
    protected $eventDispatcher;

    /**
     * @var Folder|null
     */
    protected $processingFolder;

    /**
     * All processing folders of this storage used in any storage
     *
     * @var Folder[]
     */
    protected $processingFolders;

    /**
     * whether this storage is online or offline in this request
     *
     * @var bool
     */
    protected $isOnline;

    /**
     * @var bool
     */
    protected $isDefault = false;

    /**
     * The filters used for the files and folder names.
     *
     * @var array
     */
    protected $fileAndFolderNameFilters = [];

    /**
     * Levels numbers used to generate hashed subfolders in the processing folder
     */
    const PROCESSING_FOLDER_LEVELS = 2;

    /**
     * Constructor for a storage object.
     *
     * @param Driver\DriverInterface $driver
     * @param array $storageRecord The storage record row from the database
     * @param EventDispatcherInterface|null $eventDispatcher
     */
    public function __construct(DriverInterface $driver, array $storageRecord, EventDispatcherInterface $eventDispatcher = null)
    {
        $this->storageRecord = $storageRecord;
        $this->eventDispatcher = $eventDispatcher ?? GeneralUtility::makeInstance(EventDispatcherInterface::class);
        if (is_array($storageRecord['configuration'] ?? null)) {
            $this->configuration = $storageRecord['configuration'];
        } elseif (!empty($storageRecord['configuration'] ?? '')) {
            $this->configuration = GeneralUtility::makeInstance(FlexFormService::class)->convertFlexFormContentToArray($storageRecord['configuration']);
        } else {
            $this->configuration = [];
        }
        $this->capabilities =
            ($this->storageRecord['is_browsable'] ?? null ? self::CAPABILITY_BROWSABLE : 0) |
            ($this->storageRecord['is_public'] ?? null ? self::CAPABILITY_PUBLIC : 0) |
            ($this->storageRecord['is_writable'] ?? null ? self::CAPABILITY_WRITABLE : 0) |
            // Always let the driver decide whether to set this capability
            self::CAPABILITY_HIERARCHICAL_IDENTIFIERS;

        $this->driver = $driver;
        $this->driver->setStorageUid($storageRecord['uid'] ?? null);
        $this->driver->mergeConfigurationCapabilities($this->capabilities);
        try {
            $this->driver->processConfiguration();
        } catch (InvalidConfigurationException $e) {
            // Configuration error
            $this->isOnline = false;

            $message = sprintf(
                'Failed initializing storage [%d] "%s", error: %s',
                $this->getUid(),
                $this->getName(),
                $e->getMessage()
            );

            // create a dedicated logger instance because we need a logger in the constructor
            GeneralUtility::makeInstance(LogManager::class)->getLogger(static::class)->error($message);
        }
        $this->driver->initialize();
        $this->capabilities = $this->driver->getCapabilities();

        $this->isDefault = (isset($storageRecord['is_default']) && $storageRecord['is_default'] == 1);
        $this->resetFileAndFolderNameFiltersToDefault();
    }

    /**
     * Gets the configuration.
     *
     * @return array
     */
    public function getConfiguration()
    {
        return $this->configuration;
    }

    /**
     * Sets the configuration.
     *
     * @param array $configuration
     */
    public function setConfiguration(array $configuration)
    {
        $this->configuration = $configuration;
    }

    /**
     * Gets the storage record.
     *
     * @return array
     */
    public function getStorageRecord()
    {
        return $this->storageRecord;
    }

    /**
     * Sets the storage that belongs to this storage.
     *
     * @param Driver\DriverInterface $driver
     * @return ResourceStorage
     */
    public function setDriver(DriverInterface $driver)
    {
        $this->driver = $driver;
        return $this;
    }

    /**
     * Returns the driver object belonging to this storage.
     *
     * @return Driver\DriverInterface
     */
    protected function getDriver()
    {
        return $this->driver;
    }

    /**
     * Returns the name of this storage.
     *
     * @return string
     */
    public function getName()
    {
        return $this->storageRecord['name'];
    }

    /**
     * Returns the UID of this storage.
     *
     * @return int
     */
    public function getUid()
    {
        return (int)($this->storageRecord['uid'] ?? 0);
    }

    /**
     * Tells whether there are children in this storage.
     *
     * @return bool
     */
    public function hasChildren()
    {
        return true;
    }

    /*********************************
     * Capabilities
     ********************************/
    /**
     * Returns the capabilities of this storage.
     *
     * @return int
     * @see \TYPO3\CMS\Core\Resource\ResourceStorageInterface::CAPABILITY_BROWSABLE
     * @see \TYPO3\CMS\Core\Resource\ResourceStorageInterface::CAPABILITY_PUBLIC
     * @see \TYPO3\CMS\Core\Resource\ResourceStorageInterface::CAPABILITY_WRITABLE
     * @see \TYPO3\CMS\Core\Resource\ResourceStorageInterface::CAPABILITY_HIERARCHICAL_IDENTIFIERS
     */
    public function getCapabilities()
    {
        return (int)$this->capabilities;
    }

    /**
     * Returns TRUE if this storage has the given capability.
     *
     * @param int $capability A capability, as defined in a CAPABILITY_* constant
     * @return bool
     */
    protected function hasCapability($capability)
    {
        return ($this->capabilities & $capability) == $capability;
    }

    /**
     * Returns TRUE if this storage is publicly available. This is just a
     * configuration option and does not mean that it really *is* public. OTOH
     * a storage that is marked as not publicly available will trigger the file
     * publishing mechanisms of TYPO3.
     *
     * @return bool
     */
    public function isPublic()
    {
        return $this->hasCapability(self::CAPABILITY_PUBLIC);
    }

    /**
     * Returns TRUE if this storage is writable. This is determined by the
     * driver and the storage configuration; user permissions are not taken into account.
     *
     * @return bool
     */
    public function isWritable()
    {
        return $this->hasCapability(self::CAPABILITY_WRITABLE);
    }

    /**
     * Returns TRUE if this storage is browsable by a (backend) user of TYPO3.
     *
     * @return bool
     */
    public function isBrowsable()
    {
        return $this->isOnline() && $this->hasCapability(self::CAPABILITY_BROWSABLE);
    }

    /**
     * Returns TRUE if this storage stores folder structure in file identifiers.
     *
     * @return bool
     */
    public function hasHierarchicalIdentifiers(): bool
    {
        return $this->hasCapability(self::CAPABILITY_HIERARCHICAL_IDENTIFIERS);
    }

    /**
     * Search for files in a storage based on given restrictions
     * and a possibly given folder.
     *
     * @param FileSearchDemand $searchDemand
     * @param Folder|null $folder
     * @param bool $useFilters Whether storage filters should be applied
     * @return FileSearchResultInterface
     */
    public function searchFiles(FileSearchDemand $searchDemand, Folder $folder = null, bool $useFilters = true): FileSearchResultInterface
    {
        $folder = $folder ?? $this->getRootLevelFolder();
        if (!$folder->checkActionPermission('read')) {
            return new EmptyFileSearchResult();
        }

        return new DriverFilteredSearchResult(
            new FileSearchResult(
                $searchDemand->withFolder($folder)
            ),
            $this->driver,
            $useFilters ? $this->getFileAndFolderNameFilters() : []
        );
    }

    /**
     * Returns TRUE if the identifiers used by this storage are case-sensitive.
     *
     * @return bool
     */
    public function usesCaseSensitiveIdentifiers()
    {
        return $this->driver->isCaseSensitiveFileSystem();
    }

    /**
     * Returns TRUE if this storage is browsable by a (backend) user of TYPO3.
     *
     * @return bool
     */
    public function isOnline()
    {
        if ($this->isOnline === null) {
            if ($this->getUid() === 0) {
                $this->isOnline = true;
            }
            // the storage is not marked as online for a longer time
            if ($this->storageRecord['is_online'] == 0) {
                $this->isOnline = false;
            }
            if ($this->isOnline !== false) {
                if (($GLOBALS['TYPO3_REQUEST'] ?? null) instanceof ServerRequestInterface
                    && ApplicationType::fromRequest($GLOBALS['TYPO3_REQUEST'])->isFrontend()
                ) {
                    // All files are ALWAYS available in the frontend
                    $this->isOnline = true;
                } else {
                    // check if the storage is disabled temporary for now
                    $registryObject = GeneralUtility::makeInstance(Registry::class);
                    $offlineUntil = $registryObject->get('core', 'sys_file_storage-' . $this->getUid() . '-offline-until');
                    if ($offlineUntil && $offlineUntil > time()) {
                        $this->isOnline = false;
                    } else {
                        $this->isOnline = true;
                    }
                }
            }
        }
        return $this->isOnline;
    }

    /**
     * Returns TRUE if auto extracting of metadata is enabled
     *
     * @return bool
     */
    public function autoExtractMetadataEnabled()
    {
        return !empty($this->storageRecord['auto_extract_metadata']);
    }

    /**
     * Blows the "fuse" and marks the storage as offline.
     *
     * Can only be modified by an admin.
     *
     * Typically, this is only done if the configuration is wrong.
     */
    public function markAsPermanentlyOffline()
    {
        if ($this->getUid() > 0) {
            // @todo: move this to the storage repository
            GeneralUtility::makeInstance(ConnectionPool::class)
                ->getConnectionForTable('sys_file_storage')
                ->update(
                    'sys_file_storage',
                    ['is_online' => 0],
                    ['uid' => (int)$this->getUid()]
                );
        }
        $this->storageRecord['is_online'] = 0;
        $this->isOnline = false;
    }

    /**
     * Marks this storage as offline for the next 5 minutes.
     *
     * Non-permanent: This typically happens for remote storages
     * that are "flaky" and not available all the time.
     */
    public function markAsTemporaryOffline()
    {
        $registryObject = GeneralUtility::makeInstance(Registry::class);
        $registryObject->set('core', 'sys_file_storage-' . $this->getUid() . '-offline-until', time() + 60 * 5);
        $this->storageRecord['is_online'] = 0;
        $this->isOnline = false;
    }

    /*********************************
     * User Permissions / File Mounts
     ********************************/
    /**
     * Adds a filemount as a "filter" for users to only work on a subset of a
     * storage object
     *
     * @param string $folderIdentifier
     * @param array $additionalData
     *
     * @throws Exception\FolderDoesNotExistException
     */
    public function addFileMount($folderIdentifier, $additionalData = [])
    {
        // check for the folder before we add it as a filemount
        if ($this->driver->folderExists($folderIdentifier) === false) {
            // if there is an error, this is important and should be handled
            // as otherwise the user would see the whole storage without any restrictions for the filemounts
            throw new FolderDoesNotExistException('Folder for file mount ' . $folderIdentifier . ' does not exist.', 1334427099);
        }
        $data = $this->driver->getFolderInfoByIdentifier($folderIdentifier);
        $folderObject = $this->createFolderObject($data['identifier'], $data['name']);
        // Use the canonical identifier instead of the user provided one!
        $folderIdentifier = $folderObject->getIdentifier();
        if (
            !empty($this->fileMounts[$folderIdentifier])
            && empty($this->fileMounts[$folderIdentifier]['read_only'])
            && !empty($additionalData['read_only'])
        ) {
            // Do not overwrite a regular mount with a read only mount
            return;
        }
        if (empty($additionalData)) {
            $additionalData = [
                'path' => $folderIdentifier,
                'title' => $folderIdentifier,
                'folder' => $folderObject,
            ];
        } else {
            $additionalData['folder'] = $folderObject;
            if (!isset($additionalData['title'])) {
                $additionalData['title'] = $folderIdentifier;
            }
        }
        $this->fileMounts[$folderIdentifier] = $additionalData;
    }

    /**
     * Returns all file mounts that are registered with this storage.
     *
     * @return array
     */
    public function getFileMounts()
    {
        return $this->fileMounts;
    }

    /**
     * Checks if the given subject is within one of the registered user
     * file mounts. If not, working with the file is not permitted for the user.
     *
     * @param ResourceInterface $subject file or folder
     * @param bool $checkWriteAccess If true, it is not only checked if the subject is within the file mount but also whether it isn't a read only file mount
     * @return bool
     */
    public function isWithinFileMountBoundaries($subject, $checkWriteAccess = false)
    {
        if (!$this->evaluatePermissions) {
            return true;
        }
        $isWithinFileMount = false;
        if (!$subject) {
            $subject = $this->getRootLevelFolder();
        }
        $identifier = $subject->getIdentifier();

        // Allow access to processing folder
        if ($this->isWithinProcessingFolder($identifier)) {
            $isWithinFileMount = true;
        } else {
            // Check if the identifier of the subject is within at
            // least one of the file mounts
            $writableFileMountAvailable = false;
            foreach ($this->fileMounts as $fileMount) {
                /** @var Folder $folder */
                $folder = $fileMount['folder'];
                if ($this->driver->isWithin($folder->getIdentifier(), $identifier)) {
                    $isWithinFileMount = true;
                    if (!$checkWriteAccess) {
                        break;
                    }
                    if (empty($fileMount['read_only'])) {
                        $writableFileMountAvailable = true;
                        break;
                    }
                }
            }
            $isWithinFileMount = $checkWriteAccess ? $writableFileMountAvailable : $isWithinFileMount;
        }
        return $isWithinFileMount;
    }

    /**
     * Sets whether the permissions to access or write
     * into this storage should be checked or not.
     *
     * @param bool $evaluatePermissions
     */
    public function setEvaluatePermissions($evaluatePermissions)
    {
        $this->evaluatePermissions = (bool)$evaluatePermissions;
    }

    /**
     * Gets whether the permissions to access or write
     * into this storage should be checked or not.
     *
     * @return bool $evaluatePermissions
     */
    public function getEvaluatePermissions()
    {
        return $this->evaluatePermissions;
    }

    /**
     * Sets the user permissions of the storage.
     *
     * @param array $userPermissions
     */
    public function setUserPermissions(array $userPermissions)
    {
        $this->userPermissions = $userPermissions;
    }

    /**
     * Checks if the ACL settings allow for a certain action
     * (is a user allowed to read a file or copy a folder).
     *
     * @param string $action
     * @param string $type either File or Folder
     * @return bool
     */
    public function checkUserActionPermission($action, $type)
    {
        if (!$this->evaluatePermissions) {
            return true;
        }

        $allow = false;
        if (!empty($this->userPermissions[strtolower($action) . ucfirst(strtolower($type))])) {
            $allow = true;
        }

        return $allow;
    }

    /**
     * Checks if a file operation (= action) is allowed on a
     * File/Folder/Storage (= subject).
     *
     * This method, by design, does not throw exceptions or do logging.
     * Besides the usage from other methods in this class, it is also used by
     * the Filelist UI to check whether an action is allowed and whether action
     * related UI elements should thus be shown (move icon, edit icon, etc.)
     *
     * @param string $action action, can be read, write, delete, editMeta
     * @param FileInterface $file
     * @return bool
     */
    public function checkFileActionPermission($action, FileInterface $file)
    {
        $isProcessedFile = $file instanceof ProcessedFile;
        // Check 1: Allow editing meta data of a file if it is in mount boundaries of a writable file mount
        if ($action === 'editMeta') {
            return !$isProcessedFile && $this->isWithinFileMountBoundaries($file, true);
        }
        // Check 2: Does the user have permission to perform the action? e.g. "readFile"
        if (!$isProcessedFile && $this->checkUserActionPermission($action, 'File') === false) {
            return false;
        }
        // Check 3: No action allowed on files for denied file extensions
        if (!$this->checkFileExtensionPermission($file->getName())) {
            return false;
        }
        $isReadCheck = false;
        if (in_array($action, ['read', 'copy', 'move', 'replace'], true)) {
            $isReadCheck = true;
        }
        $isWriteCheck = false;
        if (in_array($action, ['add', 'write', 'move', 'rename', 'replace', 'delete'], true)) {
            $isWriteCheck = true;
        }
        // Check 4: Does the user have the right to perform the action?
        // (= is he within the file mount borders)
        if (!$isProcessedFile && !$this->isWithinFileMountBoundaries($file, $isWriteCheck)) {
            return false;
        }

        $isMissing = false;
        if (!$isProcessedFile && $file instanceof File) {
            $isMissing = $file->isMissing();
        }

        if ($this->driver->fileExists($file->getIdentifier()) === false) {
            $file->setMissing(true);
            $isMissing = true;
        }

        // Check 5: Check the capabilities of the storage (and the driver)
        if ($isWriteCheck && ($isMissing || !$this->isWritable())) {
            return false;
        }

        // Check 6: "File permissions" of the driver (only when file isn't marked as missing)
        if (!$isMissing) {
            $filePermissions = $this->driver->getPermissions($file->getIdentifier());
            if ($isReadCheck && !$filePermissions['r']) {
                return false;
            }
            if ($isWriteCheck && !$filePermissions['w']) {
                return false;
            }
        }
        return true;
    }

    /**
     * Checks if a folder operation (= action) is allowed on a Folder.
     *
     * This method, by design, does not throw exceptions or do logging.
     * See the checkFileActionPermission() method above for the reasons.
     *
     * @param string $action
     * @param Folder $folder
     * @return bool
     */
    public function checkFolderActionPermission($action, Folder $folder = null)
    {
        // Check 1: Does the user have permission to perform the action? e.g. "writeFolder"
        if ($this->checkUserActionPermission($action, 'Folder') === false) {
            return false;
        }

        // If we do not have a folder here, we cannot do further checks
        if ($folder === null) {
            return true;
        }

        $isReadCheck = false;
        if (in_array($action, ['read', 'copy'], true)) {
            $isReadCheck = true;
        }
        $isWriteCheck = false;
        if (in_array($action, ['add', 'move', 'write', 'delete', 'rename'], true)) {
            $isWriteCheck = true;
        }
        // Check 2: Does the user has the right to perform the action?
        // (= is he within the file mount borders)
        if (!$this->isWithinFileMountBoundaries($folder, $isWriteCheck)) {
            return false;
        }
        // Check 3: Check the capabilities of the storage (and the driver)
        if ($isReadCheck && !$this->isBrowsable()) {
            return false;
        }
        if ($isWriteCheck && !$this->isWritable()) {
            return false;
        }

        // Check 4: "Folder permissions" of the driver
        $folderPermissions = $this->driver->getPermissions($folder->getIdentifier());
        if ($isReadCheck && !$folderPermissions['r']) {
            return false;
        }
        if ($isWriteCheck && !$folderPermissions['w']) {
            return false;
        }
        return true;
    }

    /**
     * If the fileName is given, checks it against the
     * TYPO3_CONF_VARS[BE][fileDenyPattern] + and if the file extension is allowed.
     *
     * @param string $fileName full filename
     * @return bool TRUE if extension/filename is allowed
     */
    protected function checkFileExtensionPermission($fileName)
    {
        $fileName = $this->driver->sanitizeFileName($fileName);
        return GeneralUtility::makeInstance(FileNameValidator::class)->isValid($fileName);
    }

    /**
     * Assures read permission for given folder.
     *
     * @param Folder $folder If a folder is given, mountpoints are checked. If not only user folder read permissions are checked.
     * @throws Exception\InsufficientFolderAccessPermissionsException
     */
    protected function assureFolderReadPermission(Folder $folder = null)
    {
        if (!$this->checkFolderActionPermission('read', $folder)) {
            if ($folder === null) {
                throw new InsufficientFolderAccessPermissionsException(
                    'You are not allowed to read folders',
                    1430657869
                );
            }
            throw new InsufficientFolderAccessPermissionsException(
                'You are not allowed to access the given folder: "' . $folder->getName() . '"',
                1375955684
            );
        }
    }

    /**
     * Assures delete permission for given folder.
     *
     * @param Folder $folder If a folder is given, mountpoints are checked. If not only user folder delete permissions are checked.
     * @param bool $checkDeleteRecursively
     * @throws Exception\InsufficientFolderAccessPermissionsException
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     */
    protected function assureFolderDeletePermission(Folder $folder, $checkDeleteRecursively)
    {
        // Check user permissions for recursive deletion if it is requested
        if ($checkDeleteRecursively && !$this->checkUserActionPermission('recursivedelete', 'Folder')) {
            throw new InsufficientUserPermissionsException('You are not allowed to delete folders recursively', 1377779423);
        }
        // Check user action permission
        if (!$this->checkFolderActionPermission('delete', $folder)) {
            throw new InsufficientFolderAccessPermissionsException(
                'You are not allowed to delete the given folder: "' . $folder->getName() . '"',
                1377779039
            );
        }
        // Check if the user has write permissions to folders
        // Would be good if we could check for actual write permissions in the containing folder
        // but we cannot since we have no access to the containing folder of this file.
        if (!$this->checkUserActionPermission('write', 'Folder')) {
            throw new InsufficientFolderWritePermissionsException('Writing to folders is not allowed.', 1377779111);
        }
    }

    /**
     * Assures read permission for given file.
     *
     * @param FileInterface $file
     * @throws Exception\InsufficientFileAccessPermissionsException
     * @throws Exception\IllegalFileExtensionException
     */
    protected function assureFileReadPermission(FileInterface $file)
    {
        if (!$this->checkFileActionPermission('read', $file)) {
            throw new InsufficientFileAccessPermissionsException(
                'You are not allowed to access that file: "' . $file->getName() . '"',
                1375955429
            );
        }
        if (!$this->checkFileExtensionPermission($file->getName())) {
            throw new IllegalFileExtensionException(
                'You are not allowed to use that file extension. File: "' . $file->getName() . '"',
                1375955430
            );
        }
    }

    /**
     * Assures write permission for given file.
     *
     * @param FileInterface $file
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientFileWritePermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     */
    protected function assureFileWritePermissions(FileInterface $file)
    {
        // Check if user is allowed to write the file and $file is writable
        if (!$this->checkFileActionPermission('write', $file)) {
            throw new InsufficientFileWritePermissionsException('Writing to file "' . $file->getIdentifier() . '" is not allowed.', 1330121088);
        }
        if (!$this->checkFileExtensionPermission($file->getName())) {
            throw new IllegalFileExtensionException('You are not allowed to edit a file with extension "' . $file->getExtension() . '"', 1366711933);
        }
    }

    /**
     * Assure replace permission for given file.
     *
     * @param FileInterface $file
     * @throws Exception\InsufficientFileWritePermissionsException
     * @throws Exception\InsufficientFolderWritePermissionsException
     */
    protected function assureFileReplacePermissions(FileInterface $file)
    {
        // Check if user is allowed to replace the file and $file is writable
        if (!$this->checkFileActionPermission('replace', $file)) {
            throw new InsufficientFileWritePermissionsException('Replacing file "' . $file->getIdentifier() . '" is not allowed.', 1436899571);
        }
        // Check if parentFolder is writable for the user
        if (!$this->checkFolderActionPermission('write', $file->getParentFolder())) {
            throw new InsufficientFolderWritePermissionsException('You are not allowed to write to the target folder "' . $file->getIdentifier() . '"', 1436899572);
        }
    }

    /**
     * Assures delete permission for given file.
     *
     * @param FileInterface $file
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientFileWritePermissionsException
     * @throws Exception\InsufficientFolderWritePermissionsException
     */
    protected function assureFileDeletePermissions(FileInterface $file)
    {
        // Check for disallowed file extensions
        if (!$this->checkFileExtensionPermission($file->getName())) {
            throw new IllegalFileExtensionException('You are not allowed to delete a file with extension "' . $file->getExtension() . '"', 1377778916);
        }
        // Check further permissions if file is not a processed file
        if (!$file instanceof ProcessedFile) {
            // Check if user is allowed to delete the file and $file is writable
            if (!$this->checkFileActionPermission('delete', $file)) {
                throw new InsufficientFileWritePermissionsException('You are not allowed to delete the file "' . $file->getIdentifier() . '"', 1319550425);
            }
            // Check if the user has write permissions to folders
            // Would be good if we could check for actual write permissions in the containing folder
            // but we cannot since we have no access to the containing folder of this file.
            if (!$this->checkUserActionPermission('write', 'Folder')) {
                throw new InsufficientFolderWritePermissionsException('Writing to folders is not allowed.', 1377778702);
            }
        }
    }

    /**
     * Checks if a file/user has the permission to be written to a Folder/Storage.
     * If not, throws an exception.
     *
     * @param Folder $targetFolder The target folder where the file should be written
     * @param string $targetFileName The file name which should be written into the storage
     *
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientUserPermissionsException
     */
    protected function assureFileAddPermissions($targetFolder, $targetFileName)
    {
        // Check for a valid file extension
        if (!$this->checkFileExtensionPermission($targetFileName)) {
            throw new IllegalFileExtensionException('Extension of file name is not allowed in "' . $targetFileName . '"!', 1322120271);
        }
        // Makes sure the user is allowed to upload
        if (!$this->checkUserActionPermission('add', 'File')) {
            throw new InsufficientUserPermissionsException('You are not allowed to add files to this storage "' . $this->getUid() . '"', 1376992145);
        }
        // Check if targetFolder is writable
        if (!$this->checkFolderActionPermission('write', $targetFolder)) {
            throw new InsufficientFolderWritePermissionsException('You are not allowed to write to the target folder "' . $targetFolder->getIdentifier() . '"', 1322120356);
        }
    }

    /**
     * Checks if a file has the permission to be uploaded to a Folder/Storage.
     * If not, throws an exception.
     *
     * @param string $localFilePath the temporary file name from $_FILES['file1']['tmp_name']
     * @param Folder $targetFolder The target folder where the file should be uploaded
     * @param string $targetFileName the destination file name $_FILES['file1']['name']
     * @param int $uploadedFileSize
     *
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @throws Exception\UploadException
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\UploadSizeException
     * @throws Exception\InsufficientUserPermissionsException
     */
    protected function assureFileUploadPermissions($localFilePath, $targetFolder, $targetFileName, $uploadedFileSize)
    {
        // Makes sure this is an uploaded file
        if (!is_uploaded_file($localFilePath)) {
            throw new UploadException('The upload has failed, no uploaded file found!', 1322110455);
        }
        // Max upload size (kb) for files.
        $maxUploadFileSize = GeneralUtility::getMaxUploadFileSize() * 1024;
        if ($maxUploadFileSize > 0 && $uploadedFileSize >= $maxUploadFileSize) {
            unlink($localFilePath);
            throw new UploadSizeException('The uploaded file exceeds the size-limit of ' . $maxUploadFileSize . ' bytes', 1322110041);
        }
        $this->assureFileAddPermissions($targetFolder, $targetFileName);
    }

    /**
     * Checks for permissions to move a file.
     *
     * @throws \RuntimeException
     * @throws Exception\InsufficientFolderAccessPermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     * @throws Exception\IllegalFileExtensionException
     * @param FileInterface $file
     * @param Folder $targetFolder
     * @param string $targetFileName
     */
    protected function assureFileMovePermissions(FileInterface $file, Folder $targetFolder, $targetFileName)
    {
        // Check if targetFolder is within this storage
        if ($this->getUid() !== $targetFolder->getStorage()->getUid()) {
            throw new \RuntimeException('The target folder is not in the same storage. Target folder given: "' . $targetFolder->getIdentifier() . '"', 1422553107);
        }
        // Check for a valid file extension
        if (!$this->checkFileExtensionPermission($targetFileName)) {
            throw new IllegalFileExtensionException('Extension of file name is not allowed in "' . $targetFileName . '"!', 1378243279);
        }
        // Check if user is allowed to move and $file is readable and writable
        if (!$file->getStorage()->checkFileActionPermission('move', $file)) {
            throw new InsufficientUserPermissionsException('You are not allowed to move files to storage "' . $this->getUid() . '"', 1319219349);
        }
        // Check if target folder is writable
        if (!$this->checkFolderActionPermission('write', $targetFolder)) {
            throw new InsufficientFolderAccessPermissionsException('You are not allowed to write to the target folder "' . $targetFolder->getIdentifier() . '"', 1319219350);
        }
    }

    /**
     * Checks for permissions to rename a file.
     *
     * @param FileInterface $file
     * @param string $targetFileName
     * @throws Exception\InsufficientFileWritePermissionsException
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientFileReadPermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     */
    protected function assureFileRenamePermissions(FileInterface $file, $targetFileName)
    {
        // Check if file extension is allowed
        if (!$this->checkFileExtensionPermission($targetFileName) || !$this->checkFileExtensionPermission($file->getName())) {
            throw new IllegalFileExtensionException('You are not allowed to rename a file with this extension. File given: "' . $file->getName() . '"', 1371466663);
        }
        // Check if user is allowed to rename
        if (!$this->checkFileActionPermission('rename', $file)) {
            throw new InsufficientUserPermissionsException('You are not allowed to rename files. File given: "' . $file->getName() . '"', 1319219351);
        }
        // Check if the user is allowed to write to folders
        // Although it would be good to check, we cannot check here if the folder actually is writable
        // because we do not know in which folder the file resides.
        // So we rely on the driver to throw an exception in case the renaming failed.
        if (!$this->checkFolderActionPermission('write')) {
            throw new InsufficientFileWritePermissionsException('You are not allowed to write to folders', 1319219352);
        }
    }

    /**
     * Check if a file has the permission to be copied on a File/Folder/Storage,
     * if not throw an exception
     *
     * @param FileInterface $file
     * @param Folder $targetFolder
     * @param string $targetFileName
     *
     * @throws Exception
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientFileReadPermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     */
    protected function assureFileCopyPermissions(FileInterface $file, Folder $targetFolder, $targetFileName)
    {
        // Check if targetFolder is within this storage, this should never happen
        if ($this->getUid() != $targetFolder->getStorage()->getUid()) {
            throw new Exception('The operation of the folder cannot be called by this storage "' . $this->getUid() . '"', 1319550405);
        }
        // Check if user is allowed to copy
        if (!$file->getStorage()->checkFileActionPermission('copy', $file)) {
            throw new InsufficientFileReadPermissionsException('You are not allowed to copy the file "' . $file->getIdentifier() . '"', 1319550426);
        }
        // Check if targetFolder is writable
        if (!$this->checkFolderActionPermission('write', $targetFolder)) {
            throw new InsufficientFolderWritePermissionsException('You are not allowed to write to the target folder "' . $targetFolder->getIdentifier() . '"', 1319550435);
        }
        // Check for a valid file extension
        if (!$this->checkFileExtensionPermission($targetFileName) || !$this->checkFileExtensionPermission($file->getName())) {
            throw new IllegalFileExtensionException('You are not allowed to copy a file of that type.', 1319553317);
        }
    }

    /**
     * Check if a file has the permission to be copied on a File/Folder/Storage,
     * if not throw an exception
     *
     * @param FolderInterface $folderToCopy
     * @param FolderInterface $targetParentFolder
     *
     * @throws Exception
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientFileReadPermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     * @throws \RuntimeException
     */
    protected function assureFolderCopyPermissions(FolderInterface $folderToCopy, FolderInterface $targetParentFolder)
    {
        // Check if targetFolder is within this storage, this should never happen
        if ($this->getUid() !== $targetParentFolder->getStorage()->getUid()) {
            throw new Exception('The operation of the folder cannot be called by this storage "' . $this->getUid() . '"', 1377777624);
        }
        if (!$folderToCopy instanceof Folder) {
            throw new \RuntimeException('The folder "' . $folderToCopy->getIdentifier() . '" to copy is not of type folder.', 1384209020);
        }
        // Check if user is allowed to copy and the folder is readable
        if (!$folderToCopy->getStorage()->checkFolderActionPermission('copy', $folderToCopy)) {
            throw new InsufficientFileReadPermissionsException('You are not allowed to copy the folder "' . $folderToCopy->getIdentifier() . '"', 1377777629);
        }
        if (!$targetParentFolder instanceof Folder) {
            throw new \RuntimeException('The target folder "' . $targetParentFolder->getIdentifier() . '" is not of type folder.', 1384209021);
        }
        // Check if targetFolder is writable
        if (!$this->checkFolderActionPermission('write', $targetParentFolder)) {
            throw new InsufficientFolderWritePermissionsException('You are not allowed to write to the target folder "' . $targetParentFolder->getIdentifier() . '"', 1377777635);
        }
    }

    /**
     * Check if a file has the permission to be copied on a File/Folder/Storage,
     * if not throw an exception
     *
     * @param FolderInterface $folderToMove
     * @param FolderInterface $targetParentFolder
     *
     * @throws \InvalidArgumentException
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientFileReadPermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     * @throws \RuntimeException
     */
    protected function assureFolderMovePermissions(FolderInterface $folderToMove, FolderInterface $targetParentFolder)
    {
        // Check if targetFolder is within this storage, this should never happen
        if ($this->getUid() !== $targetParentFolder->getStorage()->getUid()) {
            throw new \InvalidArgumentException('Cannot move a folder into a folder that does not belong to this storage.', 1325777289);
        }
        if (!$folderToMove instanceof Folder) {
            throw new \RuntimeException('The folder "' . $folderToMove->getIdentifier() . '" to move is not of type Folder.', 1384209022);
        }
        // Check if user is allowed to move and the folder is writable
        // In fact we would need to check if the parent folder of the folder to move is writable also
        // But as of now we cannot extract the parent folder from this folder
        if (!$folderToMove->getStorage()->checkFolderActionPermission('move', $folderToMove)) {
            throw new InsufficientFileReadPermissionsException('You are not allowed to copy the folder "' . $folderToMove->getIdentifier() . '"', 1377778045);
        }
        if (!$targetParentFolder instanceof Folder) {
            throw new \RuntimeException('The target folder "' . $targetParentFolder->getIdentifier() . '" is not of type Folder.', 1384209023);
        }
        // Check if targetFolder is writable
        if (!$this->checkFolderActionPermission('write', $targetParentFolder)) {
            throw new InsufficientFolderWritePermissionsException('You are not allowed to write to the target folder "' . $targetParentFolder->getIdentifier() . '"', 1377778049);
        }
    }

    /**
     * Clean up a fileName from not allowed characters
     *
     * @param string $fileName The name of the file to be sanitized
     * @param Folder|null $targetFolder The target folder where the file is located or should be added
     *
     * @return string
     */
    public function sanitizeFileName($fileName, Folder $targetFolder = null)
    {
        $targetFolder = $targetFolder ?: $this->getDefaultFolder();
        $fileName = $this->driver->sanitizeFileName($fileName);

        // The file name could be changed by an event listener
        $fileName = $this->eventDispatcher->dispatch(
            new SanitizeFileNameEvent($fileName, $targetFolder, $this, $this->driver)
        )->getFileName();

        return $fileName;
    }

    /********************
     * FILE ACTIONS
     ********************/
    /**
     * Moves a file from the local filesystem to this storage.
     *
     * @param string $localFilePath The file on the server's hard disk to add
     * @param Folder $targetFolder The target folder where the file should be added
     * @param string $targetFileName The name of the file to be add, If not set, the local file name is used
     * @param string $conflictMode a value of the DuplicationBehavior enumeration
     * @param bool $removeOriginal if set the original file will be removed after successful operation
     *
     * @throws \InvalidArgumentException
     * @throws Exception\ExistingTargetFileNameException
     * @return FileInterface
     */
    public function addFile($localFilePath, Folder $targetFolder, $targetFileName = '', $conflictMode = DuplicationBehavior::RENAME, $removeOriginal = true)
    {
        $localFilePath = PathUtility::getCanonicalPath($localFilePath);
        // File is not available locally NOR is it an uploaded file
        if (!is_uploaded_file($localFilePath) && !file_exists($localFilePath)) {
            throw new \InvalidArgumentException('File "' . $localFilePath . '" does not exist.', 1319552745);
        }
        $conflictMode = DuplicationBehavior::cast($conflictMode);
        $targetFileName = $this->sanitizeFileName($targetFileName ?: PathUtility::basename($localFilePath), $targetFolder);

        $targetFileName = $this->eventDispatcher->dispatch(
            new BeforeFileAddedEvent($targetFileName, $localFilePath, $targetFolder, $this, $this->driver)
        )->getFileName();

        $this->assureFileAddPermissions($targetFolder, $targetFileName);

        $replaceExisting = false;
        if ($conflictMode->equals(DuplicationBehavior::CANCEL) && $this->driver->fileExistsInFolder($targetFileName, $targetFolder->getIdentifier())) {
            throw new ExistingTargetFileNameException('File "' . $targetFileName . '" already exists in folder ' . $targetFolder->getIdentifier(), 1322121068);
        }
        if ($conflictMode->equals(DuplicationBehavior::RENAME)) {
            $targetFileName = $this->getUniqueName($targetFolder, $targetFileName);
        } elseif ($conflictMode->equals(DuplicationBehavior::REPLACE) && $this->driver->fileExistsInFolder($targetFileName, $targetFolder->getIdentifier())) {
            $replaceExisting = true;
        }

        $fileIdentifier = $this->driver->addFile($localFilePath, $targetFolder->getIdentifier(), $targetFileName, $removeOriginal);
        $file = $this->getFileByIdentifier($fileIdentifier);

        if ($replaceExisting && $file instanceof File) {
            $this->getIndexer()->updateIndexEntry($file);
        }

        $this->eventDispatcher->dispatch(
            new AfterFileAddedEvent($file, $targetFolder)
        );
        return $file;
    }

    /**
     * Updates a processed file with a new file from the local filesystem.
     *
     * @param string $localFilePath
     * @param ProcessedFile $processedFile
     * @param Folder $processingFolder
     * @return FileInterface
     * @throws \InvalidArgumentException
     * @internal use only
     */
    public function updateProcessedFile($localFilePath, ProcessedFile $processedFile, Folder $processingFolder = null)
    {
        if (!file_exists($localFilePath)) {
            throw new \InvalidArgumentException('File "' . $localFilePath . '" does not exist.', 1319552746);
        }
        if ($processingFolder === null) {
            $processingFolder = $this->getProcessingFolder($processedFile->getOriginalFile());
        }
        $fileIdentifier = $this->driver->addFile($localFilePath, $processingFolder->getIdentifier(), $processedFile->getName());
        // @todo check if we have to update the processed file other then the identifier
        $processedFile->setIdentifier($fileIdentifier);
        return $processedFile;
    }

    /**
     * Creates a (cryptographic) hash for a file.
     *
     * @param FileInterface $fileObject
     * @param string $hash
     * @throws \TYPO3\CMS\Core\Resource\Exception\InvalidHashException
     * @return string
     */
    public function hashFile(FileInterface $fileObject, $hash)
    {
        return $this->hashFileByIdentifier($fileObject->getIdentifier(), $hash);
    }

    /**
     * Creates a (cryptographic) hash for a fileIdentifier.
     *
     * @param string $fileIdentifier
     * @param string $hash
     * @throws \TYPO3\CMS\Core\Resource\Exception\InvalidHashException
     * @return string
     */
    public function hashFileByIdentifier($fileIdentifier, $hash)
    {
        $hash = $this->driver->hash($fileIdentifier, $hash);
        if (!is_string($hash) || $hash === '') {
            throw new InvalidHashException('Hash has to be non-empty string.', 1551950301);
        }
        return $hash;
    }

    /**
     * Hashes a file identifier, taking the case sensitivity of the file system
     * into account. This helps mitigating problems with case-insensitive
     * databases.
     *
     * @param string|FileInterface $file
     * @return string
     */
    public function hashFileIdentifier($file)
    {
        if (is_object($file) && $file instanceof FileInterface) {
            /** @var FileInterface $file */
            $file = $file->getIdentifier();
        }
        return $this->driver->hashIdentifier($file);
    }

    /**
     * Returns a publicly accessible URL for a file.
     *
     * WARNING: Access to the file may be restricted by further means, e.g.
     * some web-based authentication. You have to take care of this yourself.
     *
     * @param ResourceInterface $resourceObject The file or folder object
     * @param bool $relativeToCurrentScript Determines whether the URL returned should be relative to the current script, in case it is relative at all (only for the LocalDriver). Deprecated since TYPO3 v11, will be removed in TYPO3 v12.0
     * @return string|null NULL if file is missing or deleted, the generated url otherwise
     */
    public function getPublicUrl(ResourceInterface $resourceObject, $relativeToCurrentScript = false)
    {
        if ($relativeToCurrentScript !== false) {
            trigger_error('FAL API usage with "getPublicUrl" returning a relative path will be removed in TYPO3 v12.0.', E_USER_DEPRECATED);
        }
        $publicUrl = null;
        if ($this->isOnline()) {
            // Pre-process the public URL by an accordant event
            $event = new GeneratePublicUrlForResourceEvent($resourceObject, $this, $this->driver, $relativeToCurrentScript);
            $publicUrl = $this->eventDispatcher->dispatch($event)->getPublicUrl();
            if (
                $publicUrl === null
                && $resourceObject instanceof File
                && ($helper = GeneralUtility::makeInstance(OnlineMediaHelperRegistry::class)->getOnlineMediaHelper($resourceObject)) !== false
            ) {
                $publicUrl = $helper->getPublicUrl($resourceObject, $relativeToCurrentScript);
            }

            // If an event listener did not handle the URL generation, use the default way to determine public URL
            if ($publicUrl === null) {
                if ($this->hasCapability(self::CAPABILITY_PUBLIC)) {
                    $publicUrl = $this->driver->getPublicUrl($resourceObject->getIdentifier());
                }

                if ($publicUrl === null && $resourceObject instanceof FileInterface) {
                    $queryParameterArray = ['eID' => 'dumpFile', 't' => ''];
                    if ($resourceObject instanceof File) {
                        $queryParameterArray['f'] = $resourceObject->getUid();
                        $queryParameterArray['t'] = 'f';
                    } elseif ($resourceObject instanceof ProcessedFile) {
                        $queryParameterArray['p'] = $resourceObject->getUid();
                        $queryParameterArray['t'] = 'p';
                    }

                    $queryParameterArray['token'] = GeneralUtility::hmac(implode('|', $queryParameterArray), 'resourceStorageDumpFile');
                    $publicUrl = GeneralUtility::locationHeaderUrl(PathUtility::getAbsoluteWebPath(Environment::getPublicPath() . '/index.php'));
                    $publicUrl .= '?' . http_build_query($queryParameterArray, '', '&', PHP_QUERY_RFC3986);
                }

                // If requested, make the path relative to the current script in order to make it possible
                // to use the relative file
                if ($publicUrl !== null && $relativeToCurrentScript && !GeneralUtility::isValidUrl($publicUrl)) {
                    $absolutePathToContainingFolder = PathUtility::dirname(Environment::getPublicPath() . '/' . $publicUrl);
                    $pathPart = PathUtility::getRelativePathTo($absolutePathToContainingFolder);
                    $filePart = substr(Environment::getPublicPath() . '/' . $publicUrl, strlen($absolutePathToContainingFolder) + 1);
                    $publicUrl = $pathPart . $filePart;
                }
            }
        }
        return $publicUrl;
    }

    /**
     * Passes a file to the File Processing Services and returns the resulting ProcessedFile object.
     *
     * @param FileInterface $fileObject The file object
     * @param string $context
     * @param array $configuration
     *
     * @return ProcessedFile
     * @throws \InvalidArgumentException
     */
    public function processFile(FileInterface $fileObject, $context, array $configuration)
    {
        if ($fileObject->getStorage() !== $this) {
            throw new \InvalidArgumentException('Cannot process files of foreign storage', 1353401835);
        }
        $processedFile = $this->getFileProcessingService()->processFile($fileObject, $this, $context, $configuration);

        return $processedFile;
    }

    /**
     * Copies a file from the storage for local processing.
     *
     * @param FileInterface $fileObject
     * @param bool $writable
     * @return string Path to local file (either original or copied to some temporary local location)
     */
    public function getFileForLocalProcessing(FileInterface $fileObject, $writable = true)
    {
        $filePath = $this->driver->getFileForLocalProcessing($fileObject->getIdentifier(), $writable);
        return $filePath;
    }

    /**
     * Gets a file by identifier.
     *
     * @param string $identifier
     * @return FileInterface
     */
    public function getFile($identifier)
    {
        $file = $this->getFileByIdentifier($identifier);
        if (!$this->driver->fileExists($identifier)) {
            $file->setMissing(true);
        }
        return $file;
    }

    /**
     * Gets a file object from storage by file identifier
     * If the file is outside of the process folder, it gets indexed and returned as file object afterwards
     * If the file is within processing folder, the file object will be directly returned
     *
     * @param string $fileIdentifier
     * @return File|ProcessedFile|null
     */
    public function getFileByIdentifier(string $fileIdentifier)
    {
        if (!$this->isWithinProcessingFolder($fileIdentifier)) {
            $fileData = $this->getFileIndexRepository()->findOneByStorageAndIdentifier($this, $fileIdentifier);
            if ($fileData === false) {
                return $this->getIndexer()->createIndexEntry($fileIdentifier);
            }
            return $this->getResourceFactoryInstance()->getFileObject($fileData['uid'], $fileData);
        }
        return $this->getProcessedFileRepository()->findByStorageAndIdentifier($this, $fileIdentifier);
    }

    protected function getProcessedFileRepository(): ProcessedFileRepository
    {
        return GeneralUtility::makeInstance(ProcessedFileRepository::class);
    }

    /**
     * Gets information about a file.
     *
     * @param FileInterface $fileObject
     * @return array
     * @internal
     */
    public function getFileInfo(FileInterface $fileObject)
    {
        return $this->getFileInfoByIdentifier($fileObject->getIdentifier());
    }

    /**
     * Gets information about a file by its identifier.
     *
     * @param string $identifier
     * @param array $propertiesToExtract
     * @return array
     * @internal
     */
    public function getFileInfoByIdentifier($identifier, array $propertiesToExtract = [])
    {
        return $this->driver->getFileInfoByIdentifier($identifier, $propertiesToExtract);
    }

    /**
     * Unsets the file and folder name filters, thus making this storage return unfiltered filelists.
     */
    public function unsetFileAndFolderNameFilters()
    {
        $this->fileAndFolderNameFilters = [];
    }

    /**
     * Resets the file and folder name filters to the default values defined in the TYPO3 configuration.
     */
    public function resetFileAndFolderNameFiltersToDefault()
    {
        $this->fileAndFolderNameFilters = $GLOBALS['TYPO3_CONF_VARS']['SYS']['fal']['defaultFilterCallbacks'];
    }

    /**
     * Returns a filter for files generated by EXT:impexp
     *
     * @return array<int, ImportExportFilter|string>
     * @internal
     */
    public function getImportExportFilter(): array
    {
        $filter = GeneralUtility::makeInstance(ImportExportFilter::class);

        return [$filter, 'filterImportExportFilesAndFolders'];
    }

    /**
     * Returns the file and folder name filters used by this storage.
     *
     * @return array
     */
    public function getFileAndFolderNameFilters()
    {
        return array_merge($this->fileAndFolderNameFilters, [$this->getImportExportFilter()]);
    }

    /**
     * @param array $filters
     * @return $this
     */
    public function setFileAndFolderNameFilters(array $filters)
    {
        $this->fileAndFolderNameFilters = $filters;
        return $this;
    }

    /**
     * @param callable $filter
     */
    public function addFileAndFolderNameFilter($filter)
    {
        $this->fileAndFolderNameFilters[] = $filter;
    }

    /**
     * @param string $fileIdentifier
     *
     * @return string
     */
    public function getFolderIdentifierFromFileIdentifier($fileIdentifier)
    {
        return $this->driver->getParentFolderIdentifierOfIdentifier($fileIdentifier);
    }

    /**
     * Get file from folder
     *
     * @param string $fileName
     * @param Folder $folder
     * @return File|ProcessedFile|null
     */
    public function getFileInFolder($fileName, Folder $folder)
    {
        $identifier = $this->driver->getFileInFolder($fileName, $folder->getIdentifier());
        return $this->getFileByIdentifier($identifier);
    }

    /**
     * @param Folder $folder
     * @param int $start
     * @param int $maxNumberOfItems
     * @param bool $useFilters
     * @param bool $recursive
     * @param string $sort Property name used to sort the items.
     *                     Among them may be: '' (empty, no sorting), name,
     *                     fileext, size, tstamp and rw.
     *                     If a driver does not support the given property, it
     *                     should fall back to "name".
     * @param bool $sortRev TRUE to indicate reverse sorting (last to first)
     * @return File[]
     * @throws Exception\InsufficientFolderAccessPermissionsException
     */
    public function getFilesInFolder(Folder $folder, $start = 0, $maxNumberOfItems = 0, $useFilters = true, $recursive = false, $sort = '', $sortRev = false)
    {
        $this->assureFolderReadPermission($folder);

        $rows = $this->getFileIndexRepository()->findByFolder($folder);

        $filters = $useFilters == true ? $this->getFileAndFolderNameFilters() : [];
        $fileIdentifiers = array_values($this->driver->getFilesInFolder($folder->getIdentifier(), $start, $maxNumberOfItems, $recursive, $filters, $sort, $sortRev));

        $items = [];
        foreach ($fileIdentifiers as $identifier) {
            if (isset($rows[$identifier])) {
                $fileObject = $this->getFileFactory()->getFileObject($rows[$identifier]['uid'], $rows[$identifier]);
            } else {
                $fileObject = $this->getFileByIdentifier($identifier);
            }
            if ($fileObject instanceof FileInterface) {
                $key = $fileObject->getName();
                while (isset($items[$key])) {
                    $key .= 'z';
                }
                $items[$key] = $fileObject;
            }
        }

        return $items;
    }

    /**
     * @param string $folderIdentifier
     * @param bool $useFilters
     * @param bool $recursive
     * @return array
     */
    public function getFileIdentifiersInFolder($folderIdentifier, $useFilters = true, $recursive = false)
    {
        $filters = $useFilters == true ? $this->getFileAndFolderNameFilters() : [];
        return $this->driver->getFilesInFolder($folderIdentifier, 0, 0, $recursive, $filters);
    }

    /**
     * @param Folder $folder
     * @param bool $useFilters
     * @param bool $recursive
     * @return int Number of files in folder
     * @throws Exception\InsufficientFolderAccessPermissionsException
     */
    public function countFilesInFolder(Folder $folder, $useFilters = true, $recursive = false)
    {
        $this->assureFolderReadPermission($folder);
        $filters = $useFilters ? $this->getFileAndFolderNameFilters() : [];
        return $this->driver->countFilesInFolder($folder->getIdentifier(), $recursive, $filters);
    }

    /**
     * @param string $folderIdentifier
     * @param bool $useFilters
     * @param bool $recursive
     * @return array
     */
    public function getFolderIdentifiersInFolder($folderIdentifier, $useFilters = true, $recursive = false)
    {
        $filters = $useFilters == true ? $this->getFileAndFolderNameFilters() : [];
        return $this->driver->getFoldersInFolder($folderIdentifier, 0, 0, $recursive, $filters);
    }

    /**
     * Returns TRUE if the specified file exists
     *
     * @param string $identifier
     * @return bool
     */
    public function hasFile($identifier)
    {
        // Allow if identifier is in processing folder
        if (!$this->isWithinProcessingFolder($identifier)) {
            $this->assureFolderReadPermission();
        }
        return $this->driver->fileExists($identifier);
    }

    /**
     * Get all processing folders that live in this storage
     *
     * @return Folder[]
     */
    public function getProcessingFolders()
    {
        if ($this->processingFolders === null) {
            $this->processingFolders = [];
            $this->processingFolders[] = $this->getProcessingFolder();
            $storageRepository = GeneralUtility::makeInstance(StorageRepository::class);
            $allStorages = $storageRepository->findAll();
            foreach ($allStorages as $storage) {
                // To circumvent the permission check of the folder, we use the factory to create it "manually" instead of directly using $storage->getProcessingFolder()
                // See #66695 for details
                [$storageUid, $processingFolderIdentifier] = array_pad(GeneralUtility::trimExplode(':', $storage->getStorageRecord()['processingfolder']), 2, null);
                if (empty($processingFolderIdentifier) || (int)$storageUid !== $this->getUid()) {
                    continue;
                }
                $potentialProcessingFolder = $this->createFolderObject($processingFolderIdentifier, $processingFolderIdentifier);
                if ($potentialProcessingFolder->getStorage() === $this && $potentialProcessingFolder->getIdentifier() !== $this->getProcessingFolder()->getIdentifier()) {
                    $this->processingFolders[] = $potentialProcessingFolder;
                }
            }
        }

        return $this->processingFolders;
    }

    /**
     * Returns TRUE if folder that is in current storage  is set as
     * processing folder for one of the existing storages
     *
     * @param Folder $folder
     * @return bool
     */
    public function isProcessingFolder(Folder $folder)
    {
        $isProcessingFolder = false;
        foreach ($this->getProcessingFolders() as $processingFolder) {
            if ($folder->getCombinedIdentifier() === $processingFolder->getCombinedIdentifier()) {
                $isProcessingFolder = true;
                break;
            }
        }
        return $isProcessingFolder;
    }

    /**
     * Checks if the queried file in the given folder exists
     *
     * @param string $fileName
     * @param Folder $folder
     * @return bool
     */
    public function hasFileInFolder($fileName, Folder $folder)
    {
        $this->assureFolderReadPermission($folder);
        return $this->driver->fileExistsInFolder($fileName, $folder->getIdentifier());
    }

    /**
     * Get contents of a file object
     *
     * @param FileInterface $file
     *
     * @throws Exception\InsufficientFileReadPermissionsException
     * @return string
     */
    public function getFileContents($file)
    {
        $this->assureFileReadPermission($file);
        return $this->driver->getFileContents($file->getIdentifier());
    }

    /**
     * Returns a PSR-7 Response which can be used to stream the requested file
     *
     * @param FileInterface $file
     * @param bool $asDownload If set Content-Disposition attachment is sent, inline otherwise
     * @param string $alternativeFilename the filename for the download (if $asDownload is set)
     * @param string $overrideMimeType If set this will be used as Content-Type header instead of the automatically detected mime type.
     * @return ResponseInterface
     */
    public function streamFile(
        FileInterface $file,
        bool $asDownload = false,
        string $alternativeFilename = null,
        string $overrideMimeType = null
    ): ResponseInterface {
        if (!$this->driver instanceof StreamableDriverInterface) {
            return $this->getPseudoStream($file, $asDownload, $alternativeFilename, $overrideMimeType);
        }

        $properties = [
            'as_download' => $asDownload,
            'filename_overwrite' => $alternativeFilename,
            'mimetype_overwrite' => $overrideMimeType,
        ];
        return $this->driver->streamFile($file->getIdentifier(), $properties);
    }

    /**
     * Wrap DriverInterface::dumpFileContents into a SelfEmittableStreamInterface
     *
     * @param FileInterface $file
     * @param bool $asDownload If set Content-Disposition attachment is sent, inline otherwise
     * @param string $alternativeFilename the filename for the download (if $asDownload is set)
     * @param string $overrideMimeType If set this will be used as Content-Type header instead of the automatically detected mime type.
     * @return ResponseInterface
     */
    protected function getPseudoStream(
        FileInterface $file,
        bool $asDownload = false,
        string $alternativeFilename = null,
        string $overrideMimeType = null
    ) {
        $downloadName = $alternativeFilename ?: $file->getName();
        $contentDisposition = $asDownload ? 'attachment' : 'inline';

        $stream = new FalDumpFileContentsDecoratorStream($file->getIdentifier(), $this->driver, $file->getSize());
        $fileInfo = $this->driver->getFileInfoByIdentifier($file->getIdentifier(), ['mtime']);
        $headers = [
            'Content-Disposition' => $contentDisposition . '; filename="' . $downloadName . '"',
            'Content-Type' => $overrideMimeType ?: $file->getMimeType(),
            'Content-Length' => (string)$file->getSize(),
            'Last-Modified' => gmdate('D, d M Y H:i:s', array_pop($fileInfo)) . ' GMT',
            // Cache-Control header is needed here to solve an issue with browser IE8 and lower
            // See for more information: http://support.microsoft.com/kb/323308
            'Cache-Control' => '',
        ];

        return new Response($stream, 200, $headers);
    }

    /**
     * Set contents of a file object.
     *
     * @param AbstractFile $file
     * @param string $contents
     *
     * @throws \Exception|\RuntimeException
     * @throws Exception\InsufficientFileWritePermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     * @return int The number of bytes written to the file
     */
    public function setFileContents(AbstractFile $file, $contents)
    {
        // Check if user is allowed to edit
        $this->assureFileWritePermissions($file);
        $this->eventDispatcher->dispatch(
            new BeforeFileContentsSetEvent($file, $contents)
        );
        // Call driver method to update the file and update file index entry afterwards
        $result = $this->driver->setFileContents($file->getIdentifier(), $contents);
        if ($file instanceof File) {
            $this->getIndexer()->updateIndexEntry($file);
        }
        $this->eventDispatcher->dispatch(
            new AfterFileContentsSetEvent($file, $contents)
        );
        return $result;
    }

    /**
     * Creates a new file
     *
     * previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::func_newfile()
     *
     * @param string $fileName The name of the file to be created
     * @param Folder $targetFolderObject The target folder where the file should be created
     *
     * @throws Exception\IllegalFileExtensionException
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @return FileInterface The file object
     */
    public function createFile($fileName, Folder $targetFolderObject)
    {
        $this->assureFileAddPermissions($targetFolderObject, $fileName);
        $this->eventDispatcher->dispatch(
            new BeforeFileCreatedEvent($fileName, $targetFolderObject)
        );
        $newFileIdentifier = $this->driver->createFile($fileName, $targetFolderObject->getIdentifier());
        $this->eventDispatcher->dispatch(
            new AfterFileCreatedEvent($newFileIdentifier, $targetFolderObject)
        );
        return $this->getFileByIdentifier($newFileIdentifier);
    }

    /**
     * Previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::deleteFile()
     *
     * @param FileInterface $fileObject
     * @throws Exception\InsufficientFileAccessPermissionsException
     * @throws Exception\FileOperationErrorException
     * @return bool TRUE if deletion succeeded
     */
    public function deleteFile($fileObject)
    {
        $this->assureFileDeletePermissions($fileObject);

        $this->eventDispatcher->dispatch(
            new BeforeFileDeletedEvent($fileObject)
        );
        $deleted = true;

        if ($this->driver->fileExists($fileObject->getIdentifier())) {
            // Disable permission check to find nearest recycler and move file without errors
            $currentPermissions = $this->evaluatePermissions;
            $this->evaluatePermissions = false;

            $recyclerFolder = $this->getNearestRecyclerFolder($fileObject);
            if ($recyclerFolder === null) {
                $result = $this->driver->deleteFile($fileObject->getIdentifier());
            } else {
                $result = $this->moveFile($fileObject, $recyclerFolder);
                $deleted = false;
            }

            $this->evaluatePermissions = $currentPermissions;

            if (!$result) {
                throw new FileOperationErrorException('Deleting the file "' . $fileObject->getIdentifier() . '\' failed.', 1329831691);
            }
        }
        // Mark the file object as deleted
        if ($deleted && $fileObject instanceof AbstractFile) {
            $fileObject->setDeleted();
        }

        $this->eventDispatcher->dispatch(
            new AfterFileDeletedEvent($fileObject)
        );

        return true;
    }

    /**
     * Previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::func_copy()
     * copies a source file (from any location) in to the target
     * folder, the latter has to be part of this storage
     *
     * @param FileInterface $file
     * @param Folder $targetFolder
     * @param string $targetFileName an optional destination fileName
     * @param string $conflictMode a value of the DuplicationBehavior enumeration
     *
     * @throws \Exception|Exception\AbstractFileOperationException
     * @throws Exception\ExistingTargetFileNameException
     * @return FileInterface
     */
    public function copyFile(FileInterface $file, Folder $targetFolder, $targetFileName = null, $conflictMode = DuplicationBehavior::RENAME)
    {
        $conflictMode = DuplicationBehavior::cast($conflictMode);
        if ($targetFileName === null) {
            $targetFileName = $file->getName();
        }
        $sanitizedTargetFileName = $this->driver->sanitizeFileName($targetFileName);
        $this->assureFileCopyPermissions($file, $targetFolder, $sanitizedTargetFileName);

        $this->eventDispatcher->dispatch(
            new BeforeFileCopiedEvent($file, $targetFolder)
        );

        // File exists and we should abort, let's abort
        if ($conflictMode->equals(DuplicationBehavior::CANCEL) && $targetFolder->hasFile($sanitizedTargetFileName)) {
            throw new ExistingTargetFileNameException('The target file already exists.', 1320291064);
        }
        // File exists and we should find another name, let's find another one
        if ($conflictMode->equals(DuplicationBehavior::RENAME) && $targetFolder->hasFile($sanitizedTargetFileName)) {
            $sanitizedTargetFileName = $this->getUniqueName($targetFolder, $sanitizedTargetFileName);
        }
        $sourceStorage = $file->getStorage();
        // Call driver method to create a new file from an existing file object,
        // and return the new file object
        if ($sourceStorage === $this) {
            $newFileObjectIdentifier = $this->driver->copyFileWithinStorage($file->getIdentifier(), $targetFolder->getIdentifier(), $sanitizedTargetFileName);
        } else {
            $tempPath = $file->getForLocalProcessing();
            $newFileObjectIdentifier = $this->driver->addFile($tempPath, $targetFolder->getIdentifier(), $sanitizedTargetFileName);
        }
        $newFileObject = $this->getFileByIdentifier($newFileObjectIdentifier);

        $this->eventDispatcher->dispatch(
            new AfterFileCopiedEvent($file, $targetFolder, $newFileObjectIdentifier, $newFileObject)
        );
        return $newFileObject;
    }

    /**
     * Moves a $file into a $targetFolder
     * the target folder has to be part of this storage
     *
     * previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::func_move()
     *
     * @param FileInterface $file
     * @param Folder $targetFolder
     * @param string $targetFileName an optional destination fileName
     * @param string $conflictMode a value of the DuplicationBehavior enumeration
     *
     * @throws Exception\ExistingTargetFileNameException
     * @throws \RuntimeException
     * @return FileInterface
     */
    public function moveFile($file, $targetFolder, $targetFileName = null, $conflictMode = DuplicationBehavior::RENAME)
    {
        $conflictMode = DuplicationBehavior::cast($conflictMode);
        if ($targetFileName === null) {
            $targetFileName = $file->getName();
        }
        $originalFolder = $file->getParentFolder();
        $sanitizedTargetFileName = $this->driver->sanitizeFileName($targetFileName);
        $this->assureFileMovePermissions($file, $targetFolder, $sanitizedTargetFileName);
        if ($targetFolder->hasFile($sanitizedTargetFileName)) {
            // File exists and we should abort, let's abort
            if ($conflictMode->equals(DuplicationBehavior::RENAME)) {
                $sanitizedTargetFileName = $this->getUniqueName($targetFolder, $sanitizedTargetFileName);
            } elseif ($conflictMode->equals(DuplicationBehavior::CANCEL)) {
                throw new ExistingTargetFileNameException('The target file already exists', 1329850997);
            }
        }
        $this->eventDispatcher->dispatch(
            new BeforeFileMovedEvent($file, $targetFolder, $sanitizedTargetFileName)
        );
        $sourceStorage = $file->getStorage();
        // Call driver method to move the file and update the index entry
        try {
            if ($sourceStorage === $this) {
                $newIdentifier = $this->driver->moveFileWithinStorage($file->getIdentifier(), $targetFolder->getIdentifier(), $sanitizedTargetFileName);
                if (!$file instanceof AbstractFile) {
                    throw new \RuntimeException('The given file is not of type AbstractFile.', 1384209025);
                }
                $file->updateProperties(['identifier' => $newIdentifier]);
            } else {
                $tempPath = $file->getForLocalProcessing();
                $newIdentifier = $this->driver->addFile($tempPath, $targetFolder->getIdentifier(), $sanitizedTargetFileName);

                // Disable permission check to find nearest recycler and move file without errors
                $currentPermissions = $sourceStorage->evaluatePermissions;
                $sourceStorage->evaluatePermissions = false;

                $recyclerFolder = $sourceStorage->getNearestRecyclerFolder($file);
                if ($recyclerFolder === null) {
                    $sourceStorage->driver->deleteFile($file->getIdentifier());
                } else {
                    $sourceStorage->moveFile($file, $recyclerFolder);
                }
                $sourceStorage->evaluatePermissions = $currentPermissions;
                if ($file instanceof File) {
                    $file->updateProperties(['storage' => $this->getUid(), 'identifier' => $newIdentifier]);
                }
            }
            $this->getIndexer()->updateIndexEntry($file);
        } catch (\TYPO3\CMS\Core\Exception $e) {
            echo $e->getMessage();
        }
        $this->eventDispatcher->dispatch(
            new AfterFileMovedEvent($file, $targetFolder, $originalFolder)
        );
        return $file;
    }

    /**
     * Previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::func_rename()
     *
     * @param FileInterface $file
     * @param string $targetFileName
     * @param string $conflictMode
     * @return FileInterface
     * @throws ExistingTargetFileNameException
     */
    public function renameFile($file, $targetFileName, $conflictMode = DuplicationBehavior::RENAME)
    {
        // The name should be different from the current.
        if ($file->getName() === $targetFileName) {
            return $file;
        }
        $sanitizedTargetFileName = $this->driver->sanitizeFileName($targetFileName);
        $this->assureFileRenamePermissions($file, $sanitizedTargetFileName);
        $this->eventDispatcher->dispatch(
            new BeforeFileRenamedEvent($file, $sanitizedTargetFileName)
        );

        $conflictMode = DuplicationBehavior::cast($conflictMode);

        // Call driver method to rename the file and update the index entry
        try {
            $newIdentifier = $this->driver->renameFile($file->getIdentifier(), $sanitizedTargetFileName);
            if ($file instanceof File) {
                $file->updateProperties(['identifier' => $newIdentifier]);
            }
            $this->getIndexer()->updateIndexEntry($file);
        } catch (ExistingTargetFileNameException $exception) {
            if ($conflictMode->equals(DuplicationBehavior::RENAME)) {
                $newName = $this->getUniqueName($file->getParentFolder(), $sanitizedTargetFileName);
                $file = $this->renameFile($file, $newName);
            } elseif ($conflictMode->equals(DuplicationBehavior::CANCEL)) {
                throw $exception;
            } elseif ($conflictMode->equals(DuplicationBehavior::REPLACE)) {
                $sourceFileIdentifier = substr($file->getCombinedIdentifier(), 0, (int)strrpos($file->getCombinedIdentifier(), '/') + 1) . $sanitizedTargetFileName;
                $sourceFile = $this->getResourceFactoryInstance()->getFileObjectFromCombinedIdentifier($sourceFileIdentifier);
                $file = $this->replaceFile($sourceFile, Environment::getPublicPath() . '/' . $file->getPublicUrl());
            }
        } catch (\RuntimeException $e) {
        }

        $this->eventDispatcher->dispatch(
            new AfterFileRenamedEvent($file, $sanitizedTargetFileName)
        );

        return $file;
    }

    /**
     * Replaces a file with a local file (e.g. a freshly uploaded file)
     *
     * @param FileInterface $file
     * @param string $localFilePath
     *
     * @return FileInterface
     *
     * @throws Exception\IllegalFileExtensionException
     * @throws \InvalidArgumentException
     */
    public function replaceFile(FileInterface $file, $localFilePath)
    {
        $this->assureFileReplacePermissions($file);
        if (!file_exists($localFilePath)) {
            throw new \InvalidArgumentException('File "' . $localFilePath . '" does not exist.', 1325842622);
        }
        $this->eventDispatcher->dispatch(
            new BeforeFileReplacedEvent($file, $localFilePath)
        );
        $this->driver->replaceFile($file->getIdentifier(), $localFilePath);
        if ($file instanceof File) {
            $this->getIndexer()->updateIndexEntry($file);
        }
        $this->eventDispatcher->dispatch(
            new AfterFileReplacedEvent($file, $localFilePath)
        );
        return $file;
    }

    /**
     * Adds an uploaded file into the Storage. Previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::file_upload()
     *
     * @param array $uploadedFileData contains information about the uploaded file given by $_FILES['file1']
     * @param Folder $targetFolder the target folder
     * @param string $targetFileName the file name to be written
     * @param string $conflictMode a value of the DuplicationBehavior enumeration
     * @return FileInterface The file object
     */
    public function addUploadedFile(array $uploadedFileData, Folder $targetFolder = null, $targetFileName = null, $conflictMode = DuplicationBehavior::CANCEL)
    {
        $conflictMode = DuplicationBehavior::cast($conflictMode);
        $localFilePath = $uploadedFileData['tmp_name'];
        if ($targetFolder === null) {
            $targetFolder = $this->getDefaultFolder();
        }
        if ($targetFileName === null) {
            $targetFileName = $uploadedFileData['name'];
        }
        $targetFileName = $this->driver->sanitizeFileName($targetFileName);

        $this->assureFileUploadPermissions($localFilePath, $targetFolder, $targetFileName, $uploadedFileData['size']);
        if ($this->hasFileInFolder($targetFileName, $targetFolder) && $conflictMode->equals(DuplicationBehavior::REPLACE)) {
            $file = $this->getFileInFolder($targetFileName, $targetFolder);
            $resultObject = $this->replaceFile($file, $localFilePath);
        } else {
            $resultObject = $this->addFile($localFilePath, $targetFolder, $targetFileName, (string)$conflictMode);
        }
        return $resultObject;
    }

    /********************
     * FOLDER ACTIONS
     ********************/
    /**
     * Returns an array with all file objects in a folder and its subfolders, with the file identifiers as keys.
     * @todo check if this is a duplicate
     * @param Folder $folder
     * @return File[]
     */
    protected function getAllFileObjectsInFolder(Folder $folder)
    {
        $files = [];
        $folderQueue = [$folder];
        while (!empty($folderQueue)) {
            $folder = array_shift($folderQueue);
            foreach ($folder->getSubfolders() as $subfolder) {
                $folderQueue[] = $subfolder;
            }
            foreach ($folder->getFiles() as $file) {
                /** @var FileInterface $file */
                $files[$file->getIdentifier()] = $file;
            }
        }

        return $files;
    }

    /**
     * Moves a folder. If you want to move a folder from this storage to another
     * one, call this method on the target storage, otherwise you will get an exception.
     *
     * @param Folder $folderToMove The folder to move.
     * @param Folder $targetParentFolder The target parent folder
     * @param string $newFolderName
     * @param string $conflictMode a value of the DuplicationBehavior enumeration
     *
     * @throws \Exception|\TYPO3\CMS\Core\Exception
     * @throws \InvalidArgumentException
     * @throws InvalidTargetFolderException
     * @return Folder
     */
    public function moveFolder(Folder $folderToMove, Folder $targetParentFolder, $newFolderName = null, $conflictMode = DuplicationBehavior::RENAME)
    {
        // @todo add tests
        $this->assureFolderMovePermissions($folderToMove, $targetParentFolder);
        $sourceStorage = $folderToMove->getStorage();
        $sanitizedNewFolderName = $this->driver->sanitizeFileName($newFolderName ?: $folderToMove->getName());
        // @todo check if folder already exists in $targetParentFolder, handle this conflict then
        $this->eventDispatcher->dispatch(
            new BeforeFolderMovedEvent($folderToMove, $targetParentFolder, $sanitizedNewFolderName)
        );
        // Get all file objects now so we are able to update them after moving the folder
        $fileObjects = $this->getAllFileObjectsInFolder($folderToMove);
        if ($sourceStorage === $this) {
            if ($this->isWithinFolder($folderToMove, $targetParentFolder)) {
                throw new InvalidTargetFolderException(
                    sprintf(
                        'Cannot move folder "%s" into target folder "%s", because the target folder is already within the folder to be moved!',
                        $folderToMove->getName(),
                        $targetParentFolder->getName()
                    ),
                    1422723050
                );
            }
            $fileMappings = $this->driver->moveFolderWithinStorage($folderToMove->getIdentifier(), $targetParentFolder->getIdentifier(), $sanitizedNewFolderName);
        } else {
            $fileMappings = $this->moveFolderBetweenStorages($folderToMove, $targetParentFolder, $sanitizedNewFolderName);
        }
        // Update the identifier and storage of all file objects
        foreach ($fileObjects as $oldIdentifier => $fileObject) {
            $newIdentifier = $fileMappings[$oldIdentifier];
            $fileObject->updateProperties(['storage' => $this->getUid(), 'identifier' => $newIdentifier]);
            $this->getIndexer()->updateIndexEntry($fileObject);
        }
        $returnObject = $this->getFolder($fileMappings[$folderToMove->getIdentifier()]);

        $this->eventDispatcher->dispatch(
            new AfterFolderMovedEvent($folderToMove, $targetParentFolder, $returnObject)
        );
        return $returnObject;
    }

    /**
     * Moves the given folder from a different storage to the target folder in this storage.
     *
     * @param Folder $folderToMove
     * @param Folder $targetParentFolder
     * @param string $newFolderName
     * @throws NotImplementedMethodException
     */
    protected function moveFolderBetweenStorages(Folder $folderToMove, Folder $targetParentFolder, $newFolderName)
    {
        throw new NotImplementedMethodException('Not yet implemented', 1476046361);
    }

    /**
     * Copies a folder.
     *
     * @param FolderInterface $folderToCopy The folder to copy
     * @param FolderInterface $targetParentFolder The target folder
     * @param string $newFolderName
     * @param string $conflictMode a value of the DuplicationBehavior enumeration
     * @return Folder The new (copied) folder object
     * @throws InvalidTargetFolderException
     */
    public function copyFolder(FolderInterface $folderToCopy, FolderInterface $targetParentFolder, $newFolderName = null, $conflictMode = DuplicationBehavior::RENAME)
    {
        $conflictMode = DuplicationBehavior::cast($conflictMode);
        $this->assureFolderCopyPermissions($folderToCopy, $targetParentFolder);
        $returnObject = null;
        $sanitizedNewFolderName = $this->driver->sanitizeFileName($newFolderName ?: $folderToCopy->getName());
        if ($folderToCopy instanceof Folder && $targetParentFolder instanceof Folder) {
            $this->eventDispatcher->dispatch(
                new BeforeFolderCopiedEvent($folderToCopy, $targetParentFolder, $sanitizedNewFolderName)
            );
        }
        if ($conflictMode->equals(DuplicationBehavior::CANCEL) && ($targetParentFolder->hasFolder($sanitizedNewFolderName) || $targetParentFolder->hasFile($sanitizedNewFolderName))) {
            throw new InvalidTargetFolderException(
                sprintf(
                    'Cannot copy folder "%s" into target folder "%s", because there is already a folder or file with that name in the target folder!',
                    $sanitizedNewFolderName,
                    $targetParentFolder->getIdentifier()
                ),
                1422723059
            );
        }
        // Folder exists and we should find another name, let's find another one
        if ($conflictMode->equals(DuplicationBehavior::RENAME) && ($targetParentFolder->hasFolder($sanitizedNewFolderName) || $targetParentFolder->hasFile($sanitizedNewFolderName))) {
            $sanitizedNewFolderName = $this->getUniqueName($targetParentFolder, $sanitizedNewFolderName);
        }
        $sourceStorage = $folderToCopy->getStorage();
        // call driver method to move the file
        // that also updates the file object properties
        if ($sourceStorage === $this) {
            $this->driver->copyFolderWithinStorage($folderToCopy->getIdentifier(), $targetParentFolder->getIdentifier(), $sanitizedNewFolderName);
            $returnObject = $this->getFolder($targetParentFolder->getSubfolder($sanitizedNewFolderName)->getIdentifier());
        } else {
            $this->copyFolderBetweenStorages($folderToCopy, $targetParentFolder, $sanitizedNewFolderName);
        }
        if ($folderToCopy instanceof Folder && $targetParentFolder instanceof Folder) {
            $this->eventDispatcher->dispatch(
                new AfterFolderCopiedEvent($folderToCopy, $targetParentFolder, $returnObject)
            );
        }
        return $returnObject;
    }

    /**
     * Copies a folder between storages.
     *
     * @param FolderInterface $folderToCopy
     * @param FolderInterface $targetParentFolder
     * @param string $newFolderName
     * @throws NotImplementedMethodException
     */
    protected function copyFolderBetweenStorages(FolderInterface $folderToCopy, FolderInterface $targetParentFolder, $newFolderName)
    {
        throw new NotImplementedMethodException('Not yet implemented.', 1476046386);
    }

    /**
     * Previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::folder_move()
     *
     * @param Folder $folderObject
     * @param string $newName
     * @throws \Exception
     * @throws \InvalidArgumentException
     * @return Folder
     */
    public function renameFolder($folderObject, $newName)
    {

        // Renaming the folder should check if the parent folder is writable
        // We cannot do this however because we cannot extract the parent folder from a folder currently
        if (!$this->checkFolderActionPermission('rename', $folderObject)) {
            throw new InsufficientUserPermissionsException('You are not allowed to rename the folder "' . $folderObject->getIdentifier() . '\'', 1357811441);
        }

        $sanitizedNewName = $this->driver->sanitizeFileName($newName);
        if ($this->driver->folderExistsInFolder($sanitizedNewName, $folderObject->getIdentifier())) {
            throw new \InvalidArgumentException('The folder ' . $sanitizedNewName . ' already exists in folder ' . $folderObject->getIdentifier(), 1325418870);
        }
        $this->eventDispatcher->dispatch(
            new BeforeFolderRenamedEvent($folderObject, $sanitizedNewName)
        );
        $fileObjects = $this->getAllFileObjectsInFolder($folderObject);
        $fileMappings = $this->driver->renameFolder($folderObject->getIdentifier(), $sanitizedNewName);
        // Update the identifier of all file objects
        foreach ($fileObjects as $oldIdentifier => $fileObject) {
            $newIdentifier = $fileMappings[$oldIdentifier];
            $fileObject->updateProperties(['identifier' => $newIdentifier]);
            $this->getIndexer()->updateIndexEntry($fileObject);
        }
        $returnObject = $this->getFolder($fileMappings[$folderObject->getIdentifier()]);

        $this->eventDispatcher->dispatch(
            new AfterFolderRenamedEvent($returnObject, $folderObject)
        );
        return $returnObject;
    }

    /**
     * Previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::folder_delete()
     *
     * @param Folder $folderObject
     * @param bool $deleteRecursively
     * @throws \RuntimeException
     * @throws Exception\InsufficientFolderAccessPermissionsException
     * @throws Exception\InsufficientUserPermissionsException
     * @throws Exception\FileOperationErrorException
     * @throws Exception\InvalidPathException
     * @return bool
     */
    public function deleteFolder($folderObject, $deleteRecursively = false)
    {
        $isEmpty = $this->driver->isFolderEmpty($folderObject->getIdentifier());
        $this->assureFolderDeletePermission($folderObject, $deleteRecursively && !$isEmpty);
        if (!$isEmpty && !$deleteRecursively) {
            throw new \RuntimeException('Could not delete folder "' . $folderObject->getIdentifier() . '" because it is not empty.', 1325952534);
        }

        $this->eventDispatcher->dispatch(
            new BeforeFolderDeletedEvent($folderObject)
        );

        foreach ($this->getFilesInFolder($folderObject, 0, 0, false, $deleteRecursively) as $file) {
            $this->deleteFile($file);
        }

        $result = $this->driver->deleteFolder($folderObject->getIdentifier(), $deleteRecursively);

        $this->eventDispatcher->dispatch(
            new AfterFolderDeletedEvent($folderObject, $result)
        );
        return $result;
    }

    /**
     * Returns the Identifier for a folder within a given folder.
     *
     * @param string $folderName The name of the target folder
     * @param Folder $parentFolder
     * @param bool $returnInaccessibleFolderObject
     * @return Folder|InaccessibleFolder
     * @throws \Exception
     * @throws Exception\InsufficientFolderAccessPermissionsException
     */
    public function getFolderInFolder($folderName, Folder $parentFolder, $returnInaccessibleFolderObject = false)
    {
        $folderIdentifier = $this->driver->getFolderInFolder($folderName, $parentFolder->getIdentifier());
        return $this->getFolder($folderIdentifier, $returnInaccessibleFolderObject);
    }

    /**
     * @param Folder $folder
     * @param int $start
     * @param int $maxNumberOfItems
     * @param bool $useFilters
     * @param bool $recursive
     * @param string $sort Property name used to sort the items.
     *                     Among them may be: '' (empty, no sorting), name,
     *                     fileext, size, tstamp and rw.
     *                     If a driver does not support the given property, it
     *                     should fall back to "name".
     * @param bool $sortRev TRUE to indicate reverse sorting (last to first)
     * @return array<string|int, Folder>
     */
    public function getFoldersInFolder(Folder $folder, $start = 0, $maxNumberOfItems = 0, $useFilters = true, $recursive = false, $sort = '', $sortRev = false)
    {
        $filters = $useFilters == true ? $this->getFileAndFolderNameFilters() : [];

        $folderIdentifiers = $this->driver->getFoldersInFolder($folder->getIdentifier(), $start, $maxNumberOfItems, $recursive, $filters, $sort, $sortRev);

        // Exclude processing folders
        foreach ($this->getProcessingFolders() as $processingFolder) {
            $processingIdentifier = $processingFolder->getIdentifier();
            if (isset($folderIdentifiers[$processingIdentifier])) {
                unset($folderIdentifiers[$processingIdentifier]);
            }
        }

        $folders = [];
        foreach ($folderIdentifiers as $folderIdentifier) {
            // The folder identifier can also be an int-like string, resulting in int array keys.
            $folders[$folderIdentifier] = $this->getFolder($folderIdentifier, true);
        }
        return $folders;
    }

    /**
     * @param Folder  $folder
     * @param bool $useFilters
     * @param bool $recursive
     * @return int Number of subfolders
     * @throws Exception\InsufficientFolderAccessPermissionsException
     */
    public function countFoldersInFolder(Folder $folder, $useFilters = true, $recursive = false)
    {
        $this->assureFolderReadPermission($folder);
        $filters = $useFilters ? $this->getFileAndFolderNameFilters() : [];
        return $this->driver->countFoldersInFolder($folder->getIdentifier(), $recursive, $filters);
    }

    /**
     * Returns TRUE if the specified folder exists.
     *
     * @param string $identifier
     * @return bool
     */
    public function hasFolder($identifier)
    {
        $this->assureFolderReadPermission();
        return $this->driver->folderExists($identifier);
    }

    /**
     * Checks if the given file exists in the given folder
     *
     * @param string $folderName
     * @param Folder $folder
     * @return bool
     */
    public function hasFolderInFolder($folderName, Folder $folder)
    {
        $this->assureFolderReadPermission($folder);
        return $this->driver->folderExistsInFolder($folderName, $folder->getIdentifier());
    }

    /**
     * Creates a new folder.
     *
     * previously in \TYPO3\CMS\Core\Utility\File\ExtendedFileUtility::func_newfolder()
     *
     * @param string $folderName The new folder name
     * @param Folder $parentFolder (optional) the parent folder to create the new folder inside of. If not given, the root folder is used
     * @return Folder
     * @throws Exception\ExistingTargetFolderException
     * @throws Exception\InsufficientFolderAccessPermissionsException
     * @throws Exception\InsufficientFolderWritePermissionsException
     * @throws \Exception
     */
    public function createFolder($folderName, Folder $parentFolder = null)
    {
        if ($parentFolder === null) {
            $parentFolder = $this->getRootLevelFolder();
        } elseif (!$this->driver->folderExists($parentFolder->getIdentifier())) {
            throw new \InvalidArgumentException('Parent folder "' . $parentFolder->getIdentifier() . '" does not exist.', 1325689164);
        }
        if (!$this->checkFolderActionPermission('add', $parentFolder)) {
            throw new InsufficientFolderWritePermissionsException('You are not allowed to create directories in the folder "' . $parentFolder->getIdentifier() . '"', 1323059807);
        }
        if ($this->driver->folderExistsInFolder($folderName, $parentFolder->getIdentifier())) {
            throw new ExistingTargetFolderException('Folder "' . $folderName . '" already exists.', 1423347324);
        }

        $this->eventDispatcher->dispatch(
            new BeforeFolderAddedEvent($parentFolder, $folderName)
        );

        $newFolder = $this->getDriver()->createFolder($folderName, $parentFolder->getIdentifier(), true);
        $newFolder = $this->getFolder($newFolder);

        $this->eventDispatcher->dispatch(
            new AfterFolderAddedEvent($newFolder)
        );

        return $newFolder;
    }

    /**
     * Retrieves information about a folder
     *
     * @param Folder $folder
     * @return array
     */
    public function getFolderInfo(Folder $folder)
    {
        return $this->driver->getFolderInfoByIdentifier($folder->getIdentifier());
    }

    /**
     * Returns the default folder where new files are stored if no other folder is given.
     *
     * @return Folder
     */
    public function getDefaultFolder()
    {
        return $this->getFolder($this->driver->getDefaultFolder());
    }

    /**
     * @param string $identifier
     * @param bool $returnInaccessibleFolderObject
     *
     * @return Folder|InaccessibleFolder
     * @throws \Exception
     * @throws Exception\InsufficientFolderAccessPermissionsException
     */
    public function getFolder($identifier, $returnInaccessibleFolderObject = false)
    {
        $data = $this->driver->getFolderInfoByIdentifier($identifier);
        $folder = $this->createFolderObject($data['identifier'] ?? '', $data['name'] ?? '');

        try {
            $this->assureFolderReadPermission($folder);
        } catch (InsufficientFolderAccessPermissionsException $e) {
            $folder = null;
            if ($returnInaccessibleFolderObject) {
                // if parent folder is readable return inaccessible folder object
                $parentPermissions = $this->driver->getPermissions($this->driver->getParentFolderIdentifierOfIdentifier($identifier));
                if ($parentPermissions['r']) {
                    $folder = GeneralUtility::makeInstance(
                        InaccessibleFolder::class,
                        $this,
                        $data['identifier'],
                        $data['name']
                    );
                }
            }

            if ($folder === null) {
                throw $e;
            }
        }
        return $folder;
    }

    /**
     * Returns TRUE if the specified file is in a folder that is set a processing for a storage
     *
     * @param string $identifier
     * @return bool
     */
    public function isWithinProcessingFolder($identifier)
    {
        $inProcessingFolder = false;
        foreach ($this->getProcessingFolders() as $processingFolder) {
            if ($processingFolder->getStorage()->getDriver()->isWithin($processingFolder->getIdentifier(), $identifier)) {
                $inProcessingFolder = true;
                break;
            }
        }
        return $inProcessingFolder;
    }

    /**
     * Checks if a resource (file or folder) is within the given folder
     *
     * @param Folder $folder
     * @param ResourceInterface $resource
     * @return bool
     * @throws \InvalidArgumentException
     */
    public function isWithinFolder(Folder $folder, ResourceInterface $resource)
    {
        if ($folder->getStorage() !== $this) {
            throw new \InvalidArgumentException('Given folder "' . $folder->getIdentifier() . '" is not part of this storage!', 1422709241);
        }
        if ($folder->getStorage() !== $resource->getStorage()) {
            return false;
        }
        return $this->driver->isWithin($folder->getIdentifier(), $resource->getIdentifier());
    }

    /**
     * Returns the folders on the root level of the storage
     * or the first mount point of this storage for this user
     * if $respectFileMounts is set.
     *
     * @param bool $respectFileMounts
     * @return Folder
     */
    public function getRootLevelFolder($respectFileMounts = true)
    {
        if ($respectFileMounts && !empty($this->fileMounts)) {
            $mount = reset($this->fileMounts);
            return $mount['folder'];
        }
        return $this->createFolderObject($this->driver->getRootLevelFolder(), '');
    }

    /**
     * Returns the destination path/fileName of a unique fileName/foldername in that path.
     * If $theFile exists in $theDest (directory) the file have numbers appended up to $this->maxNumber.
     * Hereafter a unique string will be appended.
     * This function is used by fx. DataHandler when files are attached to records
     * and needs to be uniquely named in the uploads/* folders
     *
     * @param FolderInterface $folder
     * @param string $theFile The input fileName to check
     * @param bool $dontCheckForUnique If set the fileName is returned with the path prepended without checking whether it already existed!
     *
     * @throws \RuntimeException
     * @return string A unique fileName inside $folder, based on $theFile.
     * @see \TYPO3\CMS\Core\Utility\File\BasicFileUtility::getUniqueName()
     */
    protected function getUniqueName(FolderInterface $folder, $theFile, $dontCheckForUnique = false)
    {
        $maxNumber = 99;
        // Fetches info about path, name, extension of $theFile
        $origFileInfo = PathUtility::pathinfo($theFile);
        // Check if the file exists and if not - return the fileName...
        // The destinations file
        $theDestFile = $origFileInfo['basename'];
        // If the file does NOT exist we return this fileName
        if ($dontCheckForUnique || (!$this->driver->fileExistsInFolder($theDestFile, $folder->getIdentifier()) && !$this->driver->folderExistsInFolder($theDestFile, $folder->getIdentifier()))) {
            return $theDestFile;
        }
        // Well the fileName in its pure form existed. Now we try to append
        // numbers / unique-strings and see if we can find an available fileName
        // This removes _xx if appended to the file
        $theTempFileBody = preg_replace('/_[0-9][0-9]$/', '', $origFileInfo['filename']);
        $theOrigExt = ($origFileInfo['extension'] ?? '') ? '.' . $origFileInfo['extension'] : '';
        for ($a = 1; $a <= $maxNumber + 1; $a++) {
            // First we try to append numbers
            if ($a <= $maxNumber) {
                $insert = '_' . sprintf('%02d', $a);
            } else {
                $insert = '_' . substr(md5(StringUtility::getUniqueId()), 0, 6);
            }
            $theTestFile = $theTempFileBody . $insert . $theOrigExt;
            // The destinations file
            $theDestFile = $theTestFile;
            // If the file does NOT exist we return this fileName
            if (!$this->driver->fileExistsInFolder($theDestFile, $folder->getIdentifier()) && !$this->driver->folderExistsInFolder($theDestFile, $folder->getIdentifier())) {
                return $theDestFile;
            }
        }
        throw new \RuntimeException('Last possible name "' . $theDestFile . '" is already taken.', 1325194291);
    }

    /**
     * @return ResourceFactory
     */
    protected function getFileFactory()
    {
        return GeneralUtility::makeInstance(ResourceFactory::class);
    }

    /**
     * @return Index\FileIndexRepository
     */
    protected function getFileIndexRepository()
    {
        return GeneralUtility::makeInstance(FileIndexRepository::class);
    }

    /**
     * @return Service\FileProcessingService
     */
    protected function getFileProcessingService()
    {
        if (!$this->fileProcessingService) {
            $this->fileProcessingService = GeneralUtility::makeInstance(FileProcessingService::class, $this, $this->driver, $this->eventDispatcher);
        }
        return $this->fileProcessingService;
    }

    /**
     * Gets the role of a folder.
     *
     * @param FolderInterface $folder Folder object to get the role from
     * @return string The role the folder has
     */
    public function getRole(FolderInterface $folder)
    {
        $folderRole = FolderInterface::ROLE_DEFAULT;
        $identifier = $folder->getIdentifier();
        if (method_exists($this->driver, 'getRole')) {
            $folderRole = $this->driver->getRole($folder->getIdentifier());
        }
        if (isset($this->fileMounts[$identifier])) {
            $folderRole = FolderInterface::ROLE_MOUNT;

            if (!empty($this->fileMounts[$identifier]['read_only'])) {
                $folderRole = FolderInterface::ROLE_READONLY_MOUNT;
            }
            if ($this->fileMounts[$identifier]['user_mount'] ?? false) {
                $folderRole = FolderInterface::ROLE_USER_MOUNT;
            }
        }
        if ($folder instanceof Folder && $this->isProcessingFolder($folder)) {
            $folderRole = FolderInterface::ROLE_PROCESSING;
        }

        return $folderRole;
    }

    /**
     * Getter function to return the folder where the files can
     * be processed. Does not check for access rights here.
     *
     * @param File $file Specific file you want to have the processing folder for
     * @return Folder
     */
    public function getProcessingFolder(File $file = null)
    {
        // If a file is given, make sure to return the processing folder of the correct storage
        if ($file !== null && $file->getStorage()->getUid() !== $this->getUid()) {
            return $file->getStorage()->getProcessingFolder($file);
        }
        if (!isset($this->processingFolder)) {
            $processingFolder = self::DEFAULT_ProcessingFolder;
            if (!empty($this->storageRecord['processingfolder'])) {
                $processingFolder = $this->storageRecord['processingfolder'];
            }
            try {
                if (str_contains($processingFolder, ':')) {
                    [$storageUid, $processingFolderIdentifier] = explode(':', $processingFolder, 2);
                    $storage = GeneralUtility::makeInstance(StorageRepository::class)->findByUid((int)$storageUid);
                    if ($storage->hasFolder($processingFolderIdentifier)) {
                        $this->processingFolder = $storage->getFolder($processingFolderIdentifier);
                    } else {
                        $rootFolder = $storage->getRootLevelFolder(false);
                        $currentEvaluatePermissions = $storage->getEvaluatePermissions();
                        $storage->setEvaluatePermissions(false);
                        $this->processingFolder = $storage->createFolder(
                            ltrim($processingFolderIdentifier, '/'),
                            $rootFolder
                        );
                        $storage->setEvaluatePermissions($currentEvaluatePermissions);
                    }
                } else {
                    if ($this->driver->folderExists($processingFolder) === false) {
                        $rootFolder = $this->getRootLevelFolder(false);
                        try {
                            $currentEvaluatePermissions = $this->evaluatePermissions;
                            $this->evaluatePermissions = false;
                            $this->processingFolder = $this->createFolder(
                                $processingFolder,
                                $rootFolder
                            );
                            $this->evaluatePermissions = $currentEvaluatePermissions;
                        } catch (\InvalidArgumentException $e) {
                            $this->processingFolder = GeneralUtility::makeInstance(
                                InaccessibleFolder::class,
                                $this,
                                $processingFolder,
                                $processingFolder
                            );
                        }
                    } else {
                        $data = $this->driver->getFolderInfoByIdentifier($processingFolder);
                        $this->processingFolder = $this->createFolderObject($data['identifier'], $data['name']);
                    }
                }
            } catch (InsufficientFolderWritePermissionsException|ResourcePermissionsUnavailableException $e) {
                $this->processingFolder = GeneralUtility::makeInstance(
                    InaccessibleFolder::class,
                    $this,
                    $processingFolder,
                    $processingFolder
                );
            }
        }

        $processingFolder = $this->processingFolder;
        if (!empty($file)) {
            $processingFolder = $this->getNestedProcessingFolder($file, $processingFolder);
        }
        return $processingFolder;
    }

    /**
     * Getter function to return the the file's corresponding hashed subfolder
     * of the processed folder
     *
     * @param File $file
     * @param Folder $rootProcessingFolder
     * @return Folder
     * @throws Exception\InsufficientFolderWritePermissionsException
     */
    protected function getNestedProcessingFolder(File $file, Folder $rootProcessingFolder)
    {
        $processingFolder = $rootProcessingFolder;
        $nestedFolderNames = $this->getNamesForNestedProcessingFolder(
            $file->getIdentifier(),
            self::PROCESSING_FOLDER_LEVELS
        );

        try {
            foreach ($nestedFolderNames as $folderName) {
                if ($processingFolder->hasFolder($folderName)) {
                    $processingFolder = $processingFolder->getSubfolder($folderName);
                } else {
                    $currentEvaluatePermissions = $processingFolder->getStorage()->getEvaluatePermissions();
                    $processingFolder->getStorage()->setEvaluatePermissions(false);
                    $processingFolder = $processingFolder->createFolder($folderName);
                    $processingFolder->getStorage()->setEvaluatePermissions($currentEvaluatePermissions);
                }
            }
        } catch (FolderDoesNotExistException $e) {
        }

        return $processingFolder;
    }

    /**
     * Generates appropriate hashed sub-folder path for a given file identifier
     *
     * @param string $fileIdentifier
     * @param int $levels
     * @return string[]
     */
    protected function getNamesForNestedProcessingFolder($fileIdentifier, $levels)
    {
        $names = [];
        if ($levels === 0) {
            return $names;
        }
        $hash = md5($fileIdentifier);
        for ($i = 1; $i <= $levels; $i++) {
            $names[] = substr($hash, $i, 1);
        }
        return $names;
    }

    /**
     * Gets the driver Type configured for this storage.
     *
     * @return string
     */
    public function getDriverType()
    {
        return $this->storageRecord['driver'];
    }

    /**
     * Gets the Indexer.
     *
     * @return Index\Indexer
     */
    protected function getIndexer()
    {
        return GeneralUtility::makeInstance(Indexer::class, $this);
    }

    /**
     * @param bool $isDefault
     */
    public function setDefault($isDefault)
    {
        $this->isDefault = (bool)$isDefault;
    }

    /**
     * @return bool
     */
    public function isDefault()
    {
        return $this->isDefault;
    }

    /**
     * @return ResourceFactory
     */
    public function getResourceFactoryInstance(): ResourceFactory
    {
        return GeneralUtility::makeInstance(ResourceFactory::class);
    }

    /**
     * Returns the current BE user.
     *
     * @return \TYPO3\CMS\Core\Authentication\BackendUserAuthentication
     */
    protected function getBackendUser()
    {
        return $GLOBALS['BE_USER'];
    }

    /**
     * Get the nearest Recycler folder for given file
     *
     * Return null if:
     *  - There is no folder with ROLE_RECYCLER in the rootline of the given File
     *  - File is a ProcessedFile (we don't know the concept of recycler folders for processedFiles)
     *  - File is located in a folder with ROLE_RECYCLER
     *
     * @param FileInterface $file
     * @return Folder|null
     */
    protected function getNearestRecyclerFolder(FileInterface $file)
    {
        if ($file instanceof ProcessedFile) {
            return null;
        }
        // if the storage is not browsable we cannot fetch the parent folder of the file so no recycler handling is possible
        if (!$this->isBrowsable()) {
            return null;
        }

        $recyclerFolder = null;
        $folder = $file->getParentFolder();

        do {
            if ($folder->getRole() === FolderInterface::ROLE_RECYCLER) {
                break;
            }

            foreach ($folder->getSubfolders() as $subFolder) {
                if ($subFolder->getRole() === FolderInterface::ROLE_RECYCLER) {
                    $recyclerFolder = $subFolder;
                    break;
                }
            }

            $parentFolder = $folder->getParentFolder();
            $isFolderLoop = $folder->getIdentifier() === $parentFolder->getIdentifier();
            $folder = $parentFolder;
        } while ($recyclerFolder === null && !$isFolderLoop);

        return $recyclerFolder;
    }

    /**
     * Creates a folder to directly access (a part of) a storage.
     *
     * @param string $identifier The path to the folder. Might also be a simple unique string, depending on the storage driver.
     * @param string $name The name of the folder (e.g. the folder name)
     * @return Folder
     */
    protected function createFolderObject(string $identifier, string $name)
    {
        return GeneralUtility::makeInstance(Folder::class, $this, $identifier, $name);
    }
}