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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!
*/
namespace TYPO3\CMS\Core\Resource\Service;
use TYPO3\CMS\Core\Resource\File;
use TYPO3\CMS\Core\Resource\Index\ExtractorInterface;
use TYPO3\CMS\Core\Resource\Index\ExtractorRegistry;
use TYPO3\CMS\Core\Utility\GeneralUtility;
/**
* Service class to extract metadata
*/
class ExtractorService
{
/**
* @var ExtractorInterface[][]
*/
private $extractionServices;
public function extractMetaData(File $fileObject): array
{
$newMetaData = $extractedMetaData = [];
// Loop through available extractors and fetch metadata for the given file.
foreach ($this->getExtractionServices($fileObject->getStorage()->getDriverType()) as $extractorService) {
if ($this->isFileTypeSupportedByExtractor($fileObject, $extractorService)
&& $extractorService->canProcess($fileObject)
) {
$metaDataFromExtractor = $extractorService->extractMetaData($fileObject, $extractedMetaData);
if (!empty($metaDataFromExtractor)) {
$extractedMetaData[] = $metaDataFromExtractor;
$newMetaData[$extractorService->getPriority()][] = $metaDataFromExtractor;
}
}
}
// Sort metadata by priority so that merging happens in order of precedence.
ksort($newMetaData);
// Merge the collected metadata.
$metaData = [[]];
foreach ($newMetaData as $dataFromExtractors) {
foreach ($dataFromExtractors as $data) {
$metaData[] = $data;
}
}
return array_filter(array_merge(...$metaData));
}
/**
* Get available extraction services
*
* @return ExtractorInterface[]
*/
protected function getExtractionServices(string $driverType): array
{
if (empty($this->extractionServices[$driverType])) {
$this->extractionServices[$driverType] = $this->getExtractorRegistry()->getExtractorsWithDriverSupport($driverType);
}
return $this->extractionServices[$driverType];
}
/**
* Check whether the extractor service supports this file according to file type restrictions.
*/
private function isFileTypeSupportedByExtractor(File $file, ExtractorInterface $extractor): bool
{
$isSupported = true;
$fileTypeRestrictions = $extractor->getFileTypeRestrictions();
if (!empty($fileTypeRestrictions) && !in_array($file->getType(), $fileTypeRestrictions, true)) {
$isSupported = false;
}
return $isSupported;
}
/**
* Returns an instance of the FileIndexRepository
*/
protected function getExtractorRegistry(): ExtractorRegistry
{
return GeneralUtility::makeInstance(ExtractorRegistry::class);
}
}