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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\Gif\Segment;
use Magento\Framework\Exception\LocalizedException;
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;
/**
* XMP Reader for gif file format
*/
class ReadXmp implements ReadMetadataInterface
{
private const XMP_SEGMENT_NAME = 'XMP DataXMP';
/**
* see XMP Specification Part 3, 1.1.2 GIF
*/
private const MAGIC_TRAILER_LENGTH = 258;
private const MAGIC_TRAILER_START = "\x01\xFF\xFE";
private const MAGIC_TRAILER_END = "\x03\x02\x01\x00\x00";
/**
* @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->isXmp($segment)) {
return $this->getXmpMetadata->execute($this->getXmpData($segment));
}
}
return $this->metadataFactory->create([
'title' => '',
'description' => '',
'keywords' => []
]);
}
/**
* Does segment contain XMP data
*
* @param SegmentInterface $segment
* @return bool
*/
private function isXmp(SegmentInterface $segment): bool
{
return $segment->getName() === self::XMP_SEGMENT_NAME;
}
/**
* Get XMP xml
*
* @param SegmentInterface $segment
* @return string
*/
private function getXmpData(SegmentInterface $segment): string
{
$xmp = substr($segment->getData(), 14);
if (substr($xmp, -self::MAGIC_TRAILER_LENGTH, 3) !== self::MAGIC_TRAILER_START
|| substr($xmp, -5) !== self::MAGIC_TRAILER_END
) {
throw new LocalizedException(__('XMP data is corrupted'));
}
return substr($xmp, 0, -self::MAGIC_TRAILER_LENGTH);
}
}