AbstractRecursiveZipPreProcessor.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;

abstract class AbstractRecursiveZipPreProcessor implements PreProcessor
{
    abstract protected function checkPath(string $path) : bool;

    abstract protected function getRejectionMessage() : string;

    abstract protected function getOKMessage() : string;

    final public function process(FileStream $stream, Metadata $metadata)
    {
        if ($this->isFileAZip($metadata)) {
            try {
                $zip_file_path = $stream->getMetadata('uri');
                $zip = new \ZipArchive();
                $zip->open($zip_file_path);

                for ($i = 0; $i < $zip->numFiles; $i++) {
                    $original_path = $zip->getNameIndex($i);
                    if (!$this->checkPath($original_path)) {
                        return new ProcessingStatus(ProcessingStatus::REJECTED, $this->getRejectionMessage());
                    }
                }
                $zip->close();
            } catch (\Exception $e) {
                return new ProcessingStatus(ProcessingStatus::REJECTED, $e->getMessage());
            }
        }

        if (!$this->checkPath($metadata->getFilename())) {
            return new ProcessingStatus(ProcessingStatus::REJECTED, $this->getRejectionMessage());
        }

        return new ProcessingStatus(ProcessingStatus::OK, $this->getOKMessage());
    }

    private function isFileAZip(Metadata $metadata) : bool
    {
        // is extension zip?
        if ((substr_compare($metadata->getFilename(), 'zip', -strlen('zip')) === 0) === true) {
            return true;
        }
        // is mime-type zip?
        $mime_type = strtolower($metadata->getMimeType());
        if ($mime_type === 'application/zip'
            || $mime_type === 'application/x-zip-compressed'
        ) {
            return true;
        }

        return false;
    }
}