FormPersistenceManager.php

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<?php
 
declare(strict_types=1);
 
/*
 * 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!
 */
 
/*
 * Inspired by and partially taken from the Neos.Form package (www.neos.io)
 */
 
namespace ‪TYPO3\CMS\Form\Mvc\Persistence;
 
use ‪TYPO3\CMS\Core\Cache\CacheManager;
use ‪TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
use ‪TYPO3\CMS\Core\Resource\Exception\FolderDoesNotExistException;
use ‪TYPO3\CMS\Core\Resource\Exception\InsufficientFolderAccessPermissionsException;
use ‪TYPO3\CMS\Core\Resource\File;
use ‪TYPO3\CMS\Core\Resource\Filter\FileExtensionFilter;
use ‪TYPO3\CMS\Core\Resource\Folder;
use ‪TYPO3\CMS\Core\Resource\ResourceFactory;
use ‪TYPO3\CMS\Core\Resource\ResourceStorage;
use ‪TYPO3\CMS\Core\Resource\StorageRepository;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
use ‪TYPO3\CMS\Core\Utility\MathUtility;
use ‪TYPO3\CMS\Core\Utility\PathUtility;
use ‪TYPO3\CMS\Core\Utility\StringUtility;
use ‪TYPO3\CMS\Extbase\Object\ObjectManager;
use ‪TYPO3\CMS\Form\Mvc\Configuration\ConfigurationManagerInterface;
use ‪TYPO3\CMS\Form\Mvc\Configuration\Exception\FileWriteException;
use ‪TYPO3\CMS\Form\Mvc\Configuration\Exception\NoSuchFileException;
use ‪TYPO3\CMS\Form\Mvc\Configuration\YamlSource;
use ‪TYPO3\CMS\Form\Mvc\Persistence\Exception\NoUniqueIdentifierException;
use ‪TYPO3\CMS\Form\Mvc\Persistence\Exception\NoUniquePersistenceIdentifierException;
use ‪TYPO3\CMS\Form\Mvc\Persistence\Exception\PersistenceManagerException;
use ‪TYPO3\CMS\Form\Slot\FilePersistenceSlot;
 
class ‪FormPersistenceManager implements ‪FormPersistenceManagerInterface
{
    const ‪FORM_DEFINITION_FILE_EXTENSION = '.form.yaml';
 
    protected ‪$yamlSource;
 
    protected ‪$storageRepository;
 
    protected ‪$formSettings;
 
    protected ‪$filePersistenceSlot;
 
    protected ‪$runtimeCache;
 
    protected ‪$resourceFactory;
 
    public function ‪injectYamlSource(‪YamlSource ‪$yamlSource)
    {
        $this->yamlSource = ‪$yamlSource;
    }
 
    public function ‪injectStorageRepository(‪StorageRepository ‪$storageRepository)
    {
        $this->storageRepository = ‪$storageRepository;
    }
 
    public function ‪injectFilePersistenceSlot(‪FilePersistenceSlot ‪$filePersistenceSlot)
    {
        $this->filePersistenceSlot = ‪$filePersistenceSlot;
    }
 
    public function ‪injectResourceFactory(‪ResourceFactory ‪$resourceFactory)
    {
        $this->resourceFactory = ‪$resourceFactory;
    }
 
    public function ‪initializeObject()
    {
        $this->formSettings = GeneralUtility::makeInstance(ObjectManager::class)
            ->get(ConfigurationManagerInterface::class)
            ->getConfiguration(‪ConfigurationManagerInterface::CONFIGURATION_TYPE_YAML_SETTINGS, 'form');
        $this->runtimeCache = GeneralUtility::makeInstance(CacheManager::class)->getCache('runtime');
    }
 
    public function ‪load(string $persistenceIdentifier): array
    {
        $cacheKey = 'formLoad' . md5($persistenceIdentifier);
 
        $yaml = $this->runtimeCache->get($cacheKey);
        if ($yaml !== false) {
            return $yaml;
        }
 
        $file = $this->‪retrieveFileByPersistenceIdentifier($persistenceIdentifier);
 
        try {
            $yaml = $this->yamlSource->load([$file]);
            $this->‪generateErrorsIfFormDefinitionIsValidButHasInvalidFileExtension($yaml, $persistenceIdentifier);
        } catch (\Exception $e) {
            $yaml = [
                'type' => 'Form',
                'identifier' => $persistenceIdentifier,
                'label' => $e->getMessage(),
                'invalid' => true,
            ];
        }
        $this->runtimeCache->set($cacheKey, $yaml);
 
        return $yaml;
    }
 
    public function ‪save(string $persistenceIdentifier, array $formDefinition)
    {
        if (!$this->‪hasValidFileExtension($persistenceIdentifier)) {
            throw new PersistenceManagerException(sprintf('The file "%s" could not be saved.', $persistenceIdentifier), 1477679820);
        }
 
        if ($this->‪pathIsIntendedAsExtensionPath($persistenceIdentifier)) {
            if (!$this->formSettings['persistenceManager']['allowSaveToExtensionPaths']) {
                throw new PersistenceManagerException('Save to extension paths is not allowed.', 1477680881);
            }
            if (!$this->‪isFileWithinAccessibleExtensionFolders($persistenceIdentifier)) {
                $message = sprintf('The file "%s" could not be saved. Please check your configuration option "persistenceManager.allowedExtensionPaths"', $persistenceIdentifier);
                throw new PersistenceManagerException($message, 1484073571);
            }
            $fileToSave = GeneralUtility::getFileAbsFileName($persistenceIdentifier);
        } else {
            $fileToSave = $this->‪getOrCreateFile($persistenceIdentifier);
        }
 
        try {
            $this->yamlSource->save($fileToSave, $formDefinition);
        } catch (FileWriteException $e) {
            throw new PersistenceManagerException(sprintf(
                'The file "%s" could not be saved: %s',
                $persistenceIdentifier,
                $e->getMessage()
            ), 1512582637, $e);
        }
    }
 
    public function delete(string $persistenceIdentifier)
    {
        if (!$this->‪hasValidFileExtension($persistenceIdentifier)) {
            throw new PersistenceManagerException(sprintf('The file "%s" could not be removed.', $persistenceIdentifier), 1472239534);
        }
        if (!$this->‪exists($persistenceIdentifier)) {
            throw new PersistenceManagerException(sprintf('The file "%s" could not be removed.', $persistenceIdentifier), 1472239535);
        }
        if ($this->‪pathIsIntendedAsExtensionPath($persistenceIdentifier)) {
            if (!$this->formSettings['persistenceManager']['allowDeleteFromExtensionPaths']) {
                throw new PersistenceManagerException(sprintf('The file "%s" could not be removed.', $persistenceIdentifier), 1472239536);
            }
            if (!$this->‪isFileWithinAccessibleExtensionFolders($persistenceIdentifier)) {
                $message = sprintf('The file "%s" could not be removed. Please check your configuration option "persistenceManager.allowedExtensionPaths"', $persistenceIdentifier);
                throw new PersistenceManagerException($message, 1484073878);
            }
            $fileToDelete = GeneralUtility::getFileAbsFileName($persistenceIdentifier);
            unlink($fileToDelete);
        } else {
            [$storageUid, $fileIdentifier] = explode(':', $persistenceIdentifier, 2);
            $storage = $this->‪getStorageByUid((int)$storageUid);
            $file = $storage->getFile($fileIdentifier);
            if (!$storage->checkFileActionPermission('delete', $file)) {
                throw new PersistenceManagerException(sprintf('No delete access to file "%s".', $persistenceIdentifier), 1472239516);
            }
            $storage->deleteFile($file);
        }
    }
 
    public function ‪exists(string $persistenceIdentifier): bool
    {
        $exists = false;
        if ($this->‪hasValidFileExtension($persistenceIdentifier)) {
            if ($this->‪pathIsIntendedAsExtensionPath($persistenceIdentifier)) {
                if ($this->‪isFileWithinAccessibleExtensionFolders($persistenceIdentifier)) {
                    $exists = file_exists(GeneralUtility::getFileAbsFileName($persistenceIdentifier));
                }
            } else {
                [$storageUid, $fileIdentifier] = explode(':', $persistenceIdentifier, 2);
                $storage = $this->‪getStorageByUid((int)$storageUid);
                $exists = $storage->hasFile($fileIdentifier);
            }
        }
        return $exists;
    }
 
    public function ‪listForms(): array
    {
        $identifiers = [];
        $forms = [];
 
        foreach ($this->‪retrieveYamlFilesFromStorageFolders() as $file) {
            $form = $this->‪loadMetaData($file);
 
            if (!$this->‪looksLikeAFormDefinition($form)) {
                continue;
            }
 
            $persistenceIdentifier = $file->getCombinedIdentifier();
            if ($this->‪hasValidFileExtension($persistenceIdentifier)) {
                $forms[] = [
                    'identifier' => $form['identifier'],
                    'name' => $form['label'] ?? $form['identifier'],
                    'persistenceIdentifier' => $persistenceIdentifier,
                    'readOnly' => false,
                    'removable' => true,
                    'location' => 'storage',
                    'duplicateIdentifier' => false,
                    'invalid' => $form['invalid'],
                    'fileUid' => $form['fileUid'],
                ];
                $identifiers[$form['identifier']]++;
            }
        }
 
        foreach ($this->retrieveYamlFilesFromExtensionFolders() as $fullPath => $fileName) {
            $form = $this->‪loadMetaData($fullPath);
 
            if ($this->‪looksLikeAFormDefinition($form)) {
                if ($this->‪hasValidFileExtension($fileName)) {
                    $forms[] = [
                        'identifier' => $form['identifier'],
                        'name' => $form['label'] ?? $form['identifier'],
                        'persistenceIdentifier' => $fullPath,
                        'readOnly' => $this->formSettings['persistenceManager']['allowSaveToExtensionPaths'] ? false: true,
                        'removable' => $this->formSettings['persistenceManager']['allowDeleteFromExtensionPaths'] ? true: false,
                        'location' => 'extension',
                        'duplicateIdentifier' => false,
                        'invalid' => $form['invalid'],
                        'fileUid' => $form['fileUid'],
                    ];
                    $identifiers[$form['identifier']]++;
                }
            }
        }
 
        foreach ($identifiers as $identifier => $count) {
            if ($count > 1) {
                foreach ($forms as &$formDefinition) {
                    if ($formDefinition['identifier'] === $identifier) {
                        $formDefinition['duplicateIdentifier'] = true;
                    }
                }
            }
        }
 
        return $this->‪sortForms($forms);
    }
 
    public function ‪retrieveYamlFilesFromStorageFolders(): array
    {
        $filesFromStorageFolders = [];
 
        $fileExtensionFilter = GeneralUtility::makeInstance(FileExtensionFilter::class);
        $fileExtensionFilter->setAllowedFileExtensions(['yaml']);
 
        foreach ($this->‪getAccessibleFormStorageFolders() as $folder) {
            $storage = $folder->getStorage();
            $storage->setFileAndFolderNameFilters([
                [$fileExtensionFilter, 'filterFileList']
            ]);
 
            $files = $folder->getFiles(
                0,
                0,
                ‪Folder::FILTER_MODE_USE_OWN_AND_STORAGE_FILTERS,
                true
            );
            $filesFromStorageFolders = array_merge($filesFromStorageFolders, array_values($files));
            $storage->resetFileAndFolderNameFiltersToDefault();
        }
 
        return $filesFromStorageFolders;
    }
 
    public function retrieveYamlFilesFromExtensionFolders(): array
    {
        ‪$filesFromExtensionFolders = [];
 
        foreach ($this->‪getAccessibleExtensionFolders() as $relativePath => $fullPath) {
            foreach (new \DirectoryIterator($fullPath) as $fileInfo) {
                if ($fileInfo->getExtension() !== 'yaml') {
                    continue;
                }
                ‪$filesFromExtensionFolders[$relativePath . $fileInfo->getFilename()] = $fileInfo->getFilename();
            }
        }
 
        return ‪$filesFromExtensionFolders;
    }
 
    public function ‪getAccessibleFormStorageFolders(): array
    {
        $storageFolders = [];
 
        if (
            !isset($this->formSettings['persistenceManager']['allowedFileMounts'])
            || !is_array($this->formSettings['persistenceManager']['allowedFileMounts'])
            || empty($this->formSettings['persistenceManager']['allowedFileMounts'])
        ) {
            return $storageFolders;
        }
 
        foreach ($this->formSettings['persistenceManager']['allowedFileMounts'] as $allowedFileMount) {
            $allowedFileMount = rtrim($allowedFileMount, '/') . '/';
            // $fileMountPath is like "/form_definitions/" or "/group_homes/1/form_definitions/"
            [$storageUid, $fileMountPath] = explode(':', $allowedFileMount, 2);
 
            try {
                $storage = $this->‪getStorageByUid((int)$storageUid);
            } catch (PersistenceManagerException $e) {
                continue;
            }
 
            $isStorageFileMount = false;
            $parentFolder = $storage->getRootLevelFolder(false);
 
            foreach ($storage->getFileMounts() as $storageFileMount) {
                $storageFileMountFolder = $storageFileMount['folder'];
 
                // Normally should use ResourceStorage::isWithinFolder() to check if the configured file mount path is within a storage file mount but this requires a valid Folder object and thus a directory which already exists. And the folder could simply not exist yet.
                if (‪StringUtility::beginsWith($fileMountPath, $storageFileMountFolder->getIdentifier())) {
                    $isStorageFileMount = true;
                    $parentFolder = $storageFileMountFolder;
                }
            }
 
            // Get storage folder object, create it if missing
            try {
                $fileMountFolder = $storage->getFolder($fileMountPath);
            } catch (InsufficientFolderAccessPermissionsException $e) {
                continue;
            } catch (FolderDoesNotExistException $e) {
                if ($isStorageFileMount) {
                    $fileMountPath = substr(
                        $fileMountPath,
                        strlen($parentFolder->getIdentifier())
                    );
                }
 
                try {
                    $fileMountFolder = $storage->createFolder($fileMountPath, $parentFolder);
                } catch (InsufficientFolderAccessPermissionsException $e) {
                    continue;
                }
            }
 
            $storageFolders[$allowedFileMount] = $fileMountFolder;
        }
        return $storageFolders;
    }
 
    public function ‪getAccessibleExtensionFolders(): array
    {
        $extensionFolders = $this->runtimeCache->get('formAccessibleExtensionFolders');
 
        if ($extensionFolders !== false) {
            return $extensionFolders;
        }
 
        $extensionFolders = [];
        if (
            !isset($this->formSettings['persistenceManager']['allowedExtensionPaths'])
            || !is_array($this->formSettings['persistenceManager']['allowedExtensionPaths'])
            || empty($this->formSettings['persistenceManager']['allowedExtensionPaths'])
        ) {
            $this->runtimeCache->set('formAccessibleExtensionFolders', $extensionFolders);
            return $extensionFolders;
        }
 
        foreach ($this->formSettings['persistenceManager']['allowedExtensionPaths'] as $allowedExtensionPath) {
            if (!$this->‪pathIsIntendedAsExtensionPath($allowedExtensionPath)) {
                continue;
            }
 
            $allowedExtensionFullPath = GeneralUtility::getFileAbsFileName($allowedExtensionPath);
            if (!file_exists($allowedExtensionFullPath)) {
                continue;
            }
            $allowedExtensionPath = rtrim($allowedExtensionPath, '/') . '/';
            $extensionFolders[$allowedExtensionPath] = $allowedExtensionFullPath;
        }
 
        $this->runtimeCache->set('formAccessibleExtensionFolders', $extensionFolders);
        return $extensionFolders;
    }
 
    public function ‪getUniquePersistenceIdentifier(string $formIdentifier, string $savePath): string
    {
        $savePath = rtrim($savePath, '/') . '/';
        $formPersistenceIdentifier = $savePath . $formIdentifier . ‪self::FORM_DEFINITION_FILE_EXTENSION;
        if (!$this->‪exists($formPersistenceIdentifier)) {
            return $formPersistenceIdentifier;
        }
        for ($attempts = 1; $attempts < 100; $attempts++) {
            $formPersistenceIdentifier = $savePath . sprintf('%s_%d', $formIdentifier, $attempts) . ‪self::FORM_DEFINITION_FILE_EXTENSION;
            if (!$this->‪exists($formPersistenceIdentifier)) {
                return $formPersistenceIdentifier;
            }
        }
        $formPersistenceIdentifier = $savePath . sprintf('%s_%d', $formIdentifier, time()) . ‪self::FORM_DEFINITION_FILE_EXTENSION;
        if (!$this->‪exists($formPersistenceIdentifier)) {
            return $formPersistenceIdentifier;
        }
 
        throw new NoUniquePersistenceIdentifierException(
            sprintf('Could not find a unique persistence identifier for form identifier "%s" after %d attempts', $formIdentifier, $attempts),
            1476010403
        );
    }
 
    public function ‪getUniqueIdentifier(string $identifier): string
    {
        $originalIdentifier = $identifier;
        if ($this->‪checkForDuplicateIdentifier($identifier)) {
            for ($attempts = 1; $attempts < 100; $attempts++) {
                $identifier = sprintf('%s_%d', $originalIdentifier, $attempts);
                if (!$this->‪checkForDuplicateIdentifier($identifier)) {
                    return $identifier;
                }
            }
            $identifier = $originalIdentifier . '_' . time();
            if ($this->‪checkForDuplicateIdentifier($identifier)) {
                throw new NoUniqueIdentifierException(
                    sprintf('Could not find a unique identifier for form identifier "%s" after %d attempts', $identifier, $attempts),
                    1477688567
                );
            }
        }
        return  $identifier;
    }
 
    public function ‪checkForDuplicateIdentifier(string $identifier): bool
    {
        $identifierUsed = false;
        foreach ($this->‪listForms() as $formDefinition) {
            if ($formDefinition['identifier'] === $identifier) {
                $identifierUsed = true;
                break;
            }
        }
        return $identifierUsed;
    }
 
    public function ‪isAllowedPersistencePath(string $persistencePath): bool
    {
        $pathinfo = ‪PathUtility::pathinfo($persistencePath);
        $persistencePathIsFile = isset($pathinfo['extension']);
 
        if (
            $persistencePathIsFile
            && $this->‪pathIsIntendedAsExtensionPath($persistencePath)
            && $this->‪hasValidFileExtension($persistencePath)
            && $this->‪isFileWithinAccessibleExtensionFolders($persistencePath)
        ) {
            return true;
        }
        if (
            $persistencePathIsFile
            && $this->‪pathIsIntendedAsFileMountPath($persistencePath)
            && $this->‪hasValidFileExtension($persistencePath)
            && $this->‪isFileWithinAccessibleFormStorageFolders($persistencePath)
        ) {
            return true;
        }
        if (
            !$persistencePathIsFile
            && $this->‪pathIsIntendedAsExtensionPath($persistencePath)
            && $this->‪isAccessibleExtensionFolder($persistencePath)
        ) {
            return true;
        }
        if (
            !$persistencePathIsFile
            && $this->‪pathIsIntendedAsFileMountPath($persistencePath)
            && $this->‪isAccessibleFormStorageFolder($persistencePath)
        ) {
            return true;
        }
 
        return false;
    }
 
    protected function ‪pathIsIntendedAsExtensionPath(string $path): bool
    {
        return strpos($path, 'EXT:') === 0;
    }
 
    protected function ‪pathIsIntendedAsFileMountPath(string $path): bool
    {
        if (empty($path)) {
            return false;
        }
 
        [$storageUid, $pathIdentifier] = explode(':', $path, 2);
        if (empty($storageUid) || empty($pathIdentifier)) {
            return false;
        }
 
        return ‪MathUtility::canBeInterpretedAsInteger($storageUid);
    }
 
    protected function ‪getOrCreateFile(string $persistenceIdentifier): File
    {
        [$storageUid, $fileIdentifier] = explode(':', $persistenceIdentifier, 2);
        $storage = $this->‪getStorageByUid((int)$storageUid);
        $pathinfo = ‪PathUtility::pathinfo($fileIdentifier);
 
        if (!$storage->hasFolder($pathinfo['dirname'])) {
            throw new PersistenceManagerException(sprintf('Could not create folder "%s".', $pathinfo['dirname']), 1471630579);
        }
 
        try {
            $folder = $storage->getFolder($pathinfo['dirname']);
        } catch (InsufficientFolderAccessPermissionsException $e) {
            throw new PersistenceManagerException(sprintf('No read access to folder "%s".', $pathinfo['dirname']), 1512583307);
        }
 
        if (!$storage->checkFolderActionPermission('write', $folder)) {
            throw new PersistenceManagerException(sprintf('No write access to folder "%s".', $pathinfo['dirname']), 1471630580);
        }
 
        if (!$storage->hasFile($fileIdentifier)) {
            $this->filePersistenceSlot->allowInvocation(
                ‪FilePersistenceSlot::COMMAND_FILE_CREATE,
                $folder->getCombinedIdentifier() . $pathinfo['basename']
            );
            $file = $folder->createFile($pathinfo['basename']);
        } else {
            $file = $storage->getFile($fileIdentifier);
        }
        return $file;
    }
 
    protected function ‪getStorageByUid(int $storageUid): ResourceStorage
    {
        $storage = $this->storageRepository->findByUid($storageUid);
        if (
            !$storage instanceof ResourceStorage
            || !$storage->isBrowsable()
        ) {
            throw new PersistenceManagerException(sprintf('Could not access storage with uid "%d".', $storageUid), 1471630581);
        }
        return $storage;
    }
 
    protected function ‪loadMetaData($persistenceIdentifier): array
    {
        if ($persistenceIdentifier instanceof ‪File) {
            $file = $persistenceIdentifier;
            $persistenceIdentifier = $file->getCombinedIdentifier();
        } else {
            $file = $this->‪retrieveFileByPersistenceIdentifier($persistenceIdentifier);
        }
 
        try {
            $rawYamlContent = $file->getContents();
 
            if ($rawYamlContent === false) {
                throw new ‪NoSuchFileException(sprintf('YAML file "%s" could not be loaded', $persistenceIdentifier), 1524684462);
            }
 
            $yaml = $this->‪extractMetaDataFromCouldBeFormDefinition($rawYamlContent);
            $this->‪generateErrorsIfFormDefinitionIsValidButHasInvalidFileExtension($yaml, $persistenceIdentifier);
            $yaml['fileUid'] = $file->getUid();
        } catch (\‪Exception $e) {
            $yaml = [
                'type' => 'Form',
                'identifier' => $persistenceIdentifier,
                'label' => $e->getMessage(),
                'invalid' => true,
            ];
        }
 
        return $yaml;
    }
 
    protected function ‪extractMetaDataFromCouldBeFormDefinition(string $maybeRawFormDefinition): array
    {
        $metaDataProperties = ['identifier', 'type', 'label', 'prototypeName'];
        $metaData = [];
        foreach (explode(LF, $maybeRawFormDefinition) as $line) {
            if (empty($line) || $line[0] === ' ') {
                continue;
            }
 
            [$key, $value] = explode(':', $line);
            if (
                empty($key)
                || empty($value)
                || !in_array($key, $metaDataProperties, true)
            ) {
                continue;
            }
 
            $value = trim($value, " '\"\r");
            $metaData[$key] = $value;
        }
 
        return $metaData;
    }
 
    protected function ‪generateErrorsIfFormDefinitionIsValidButHasInvalidFileExtension(array $formDefinition, string $persistenceIdentifier): void
    {
        if (
            $this->‪looksLikeAFormDefinition($formDefinition)
            && !$this->‪hasValidFileExtension($persistenceIdentifier)
        ) {
            throw new ‪PersistenceManagerException(sprintf('Form definition "%s" does not end with ".form.yaml".', $persistenceIdentifier), 1531160649);
        }
    }
 
    protected function ‪retrieveFileByPersistenceIdentifier(string $persistenceIdentifier): ‪File
    {
        if (pathinfo($persistenceIdentifier, PATHINFO_EXTENSION) !== 'yaml') {
            throw new ‪PersistenceManagerException(sprintf('The file "%s" could not be loaded.', $persistenceIdentifier), 1477679819);
        }
 
        if (
            $this->‪pathIsIntendedAsExtensionPath($persistenceIdentifier)
            && !$this->‪isFileWithinAccessibleExtensionFolders($persistenceIdentifier)
        ) {
            $message = sprintf('The file "%s" could not be loaded. Please check your configuration option "persistenceManager.allowedExtensionPaths"', $persistenceIdentifier);
            throw new PersistenceManagerException($message, 1484071985);
        }
 
        try {
            $file = $this->resourceFactory->retrieveFileOrFolderObject($persistenceIdentifier);
        } catch (\Exception $e) {
            // Top level catch to ensure useful following exception handling, because FAL throws top level exceptions.
            $file = null;
        }
 
        if ($file === null) {
            throw new NoSuchFileException(sprintf('YAML file "%s" could not be loaded', $persistenceIdentifier), 1524684442);
        }
 
        if (!$file->getStorage()->checkFileActionPermission('read', $file)) {
            throw new PersistenceManagerException(sprintf('No read access to file "%s".', $persistenceIdentifier), 1471630578);
        }
 
        return $file;
    }
 
    protected function ‪hasValidFileExtension(string $fileName): bool
    {
        return ‪StringUtility::endsWith($fileName, self::FORM_DEFINITION_FILE_EXTENSION);
    }
 
    protected function ‪isFileWithinAccessibleExtensionFolders(string $fileName): bool
    {
        $pathInfo = ‪PathUtility::pathinfo($fileName, PATHINFO_DIRNAME);
        $pathInfo = is_string($pathInfo) ? $pathInfo : '';
        $dirName = rtrim($pathInfo, '/') . '/';
        return array_key_exists($dirName, $this->‪getAccessibleExtensionFolders());
    }
 
    protected function ‪isFileWithinAccessibleFormStorageFolders(string $fileName): bool
    {
        $pathInfo = ‪PathUtility::pathinfo($fileName, PATHINFO_DIRNAME);
        $pathInfo = is_string($pathInfo) ? $pathInfo : '';
        $dirName = rtrim($pathInfo, '/') . '/';
        return array_key_exists($dirName, $this->‪getAccessibleFormStorageFolders());
    }
 
    protected function ‪isAccessibleExtensionFolder(string $folderName): bool
    {
        $folderName = rtrim($folderName, '/') . '/';
        return array_key_exists($folderName, $this->‪getAccessibleExtensionFolders());
    }
 
    protected function ‪isAccessibleFormStorageFolder(string $folderName): bool
    {
        $folderName = rtrim($folderName, '/') . '/';
        return array_key_exists($folderName, $this->‪getAccessibleFormStorageFolders());
    }
 
    protected function ‪looksLikeAFormDefinition(array $data): bool
    {
        return isset($data['identifier'], $data['type']) && !empty($data['identifier']) && trim($data['type']) === 'Form';
    }
 
    protected function ‪sortForms(array $forms): array
    {
        $keys = $this->formSettings['persistenceManager']['sortByKeys'] ?? ['name', 'fileUid'];
        $ascending = $this->formSettings['persistenceManager']['sortAscending'] ?? true;
 
        usort($forms, function (array $a, array $b) use ($keys) {
            foreach ($keys as $key) {
                if (isset($a[$key]) && isset($b[$key])) {
                    $diff = strcasecmp((string)$a[$key], (string)$b[$key]);
                    if ($diff) {
                        return $diff;
                    }
                }
            }
        });
 
        return ($ascending) ? $forms : array_reverse($forms);
    }
}