FilenameSanitizerPreProcessor.php

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<?php

namespace ILIAS\FileUpload\Processor;

use ILIAS\Filesystem\Stream\FileStream;
use ILIAS\FileUpload\DTO\Metadata;
use ILIAS\FileUpload\DTO\ProcessingStatus;
use ILIAS\Filesystem\Util;

final class FilenameSanitizerPreProcessor implements PreProcessor
{
    public function process(FileStream $stream, Metadata $metadata): ProcessingStatus
    {
        $filename = $metadata->getFilename();
        // remove some special characters
        $filename = Util::sanitizeFileName($filename);

        $metadata->setFilename($filename);

        return new ProcessingStatus(ProcessingStatus::OK, 'Filename changed');
    }

    private function normalizeRelativePath(string $path): string
    {
        $path = str_replace('\\', '/', $path);
        $path = preg_replace('#\p{C}+#u', '', $path);
        $parts = [];

        foreach (explode('/', $path) as $part) {
            switch ($part) {
                case '':
                case '.':
                    break;

                case '..':
                    if (empty($parts)) {
                        throw new \LogicException(
                            'Path is outside of the defined root, path: [' . $path . ']'
                        );
                    }
                    array_pop($parts);
                    break;

                default:
                    $parts[] = $part;
                    break;
            }
        }

        return implode('/', $parts);
    }
}