ArrayToValidationElementConverter.php

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<?php
namespace TYPO3\CMS\Form\Domain\Property\TypeConverter;

/*
 * 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!
 */

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Property\PropertyMappingConfigurationInterface;
use TYPO3\CMS\Extbase\Property\TypeConverter\AbstractTypeConverter;
use TYPO3\CMS\Form\Domain\Model\ValidationElement;

class ArrayToValidationElementConverter extends AbstractTypeConverter
{
    protected $sourceTypes = ['array'];

    protected $targetType = 'TYPO3\\CMS\\Form\\Domain\\Model\\ValidationElement';

    protected $priority = 1;

    public function canConvertFrom($source, $targetType)
    {
        return is_array($source);
    }

    public function convertFrom($source, $targetType, array $convertedChildProperties = [], PropertyMappingConfigurationInterface $configuration = null)
    {
        $validationElement = GeneralUtility::makeInstance(ValidationElement::class);
        if (is_array($source)) {
            foreach ($source as $propertyName => $value) {
                if (is_array($value)) {
                    $uploadedFiles = [];
                    if (
                        isset($value['name'])
                        && isset($value['type'])
                        && isset($value['tmp_name'])
                        && isset($value['size'])
                    ) {
                        // if single file upload - cast to array
                        $uploadedFiles[] = $value;
                    } elseif (
                        isset($value[0]['name'])
                        && isset($value[0]['type'])
                        && isset($value[0]['tmp_name'])
                        && isset($value[0]['size'])
                    ) {
                        // multi file upload
                        $uploadedFiles = $value;
                    }

                    if (!empty($uploadedFiles)) {
                        foreach ($uploadedFiles as $key => &$file) {
                            if (
                                $file['name'] === ''
                                && $file['type'] === ''
                                && $file['tmp_name'] === ''
                                && $file['size'] === 0
                            ) {
                                unset($uploadedFiles[$key]);
                                continue;
                            }
                            $fileInfo = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Type\File\FileInfo::class, $file['tmp_name']);
                            $file['type'] = $fileInfo->getMimeType();
                            $file['name'] = htmlspecialchars($file['name']);
                        }
                        $source[$propertyName] = $uploadedFiles;
                    }
                }
            }
            $validationElement->setIncomingFields($source);
        }

        return $validationElement;
    }
}