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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
declare(strict_types=1);
namespace Magento\MediaGalleryMetadata\Model\Jpeg\Segment;
use Magento\MediaGalleryMetadata\Model\GetXmpMetadata;
use Magento\MediaGalleryMetadataApi\Api\Data\MetadataInterface;
use Magento\MediaGalleryMetadataApi\Api\Data\MetadataInterfaceFactory;
use Magento\MediaGalleryMetadataApi\Model\FileInterface;
use Magento\MediaGalleryMetadataApi\Model\ReadMetadataInterface;
use Magento\MediaGalleryMetadataApi\Model\SegmentInterface;
/**
* Jpeg XMP Reader
*/
class ReadXmp implements ReadMetadataInterface
{
private const XMP_SEGMENT_NAME = 'APP1';
private const XMP_SEGMENT_START = "http://ns.adobe.com/xap/1.0/\x00";
private const XMP_DATA_START_POSITION = 29;
/**
* @var MetadataInterfaceFactory
*/
private $metadataFactory;
/**
* @var GetXmpMetadata
*/
private $getXmpMetadata;
/**
* @param MetadataInterfaceFactory $metadataFactory
* @param GetXmpMetadata $getXmpMetadata
*/
public function __construct(MetadataInterfaceFactory $metadataFactory, GetXmpMetadata $getXmpMetadata)
{
$this->metadataFactory = $metadataFactory;
$this->getXmpMetadata = $getXmpMetadata;
}
/**
* @inheritdoc
*/
public function execute(FileInterface $file): MetadataInterface
{
foreach ($file->getSegments() as $segment) {
if ($this->isSegmentXmp($segment)) {
return $this->getXmpMetadata->execute($this->getXmpData($segment));
}
}
return $this->metadataFactory->create([
'title' => null,
'description' => null,
'keywords' => null
]);
}
/**
* Does segment contain XMP data
*
* @param SegmentInterface $segment
* @return bool
*/
private function isSegmentXmp(SegmentInterface $segment): bool
{
return $segment->getName() === self::XMP_SEGMENT_NAME
&& strncmp($segment->getData(), self::XMP_SEGMENT_START, self::XMP_DATA_START_POSITION) == 0;
}
/**
* Get XMP xml
*
* @param SegmentInterface $segment
* @return string
*/
private function getXmpData(SegmentInterface $segment): string
{
return substr($segment->getData(), self::XMP_DATA_START_POSITION);
}
}