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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;
use Magento\MediaGalleryMetadataApi\Api\Data\MetadataInterface;
/**
* Add metadata to the XMP template
*/
class AddXmpMetadata
{
private const XMP_XPATH_SELECTOR_TITLE = '//dc:title/rdf:Alt/rdf:li';
private const XMP_XPATH_SELECTOR_DESCRIPTION = '//dc:description/rdf:Alt/rdf:li';
private const XMP_XPATH_SELECTOR_KEYWORDS = '//dc:subject/rdf:Bag';
private const XMP_XPATH_SELECTOR_KEYWORDS_EACH = '//dc:subject/rdf:Bag/rdf:li';
private const XMP_XPATH_SELECTOR_KEYWORD_ITEM = 'rdf:li';
/**
* Parse metadata
*
* @param string $data
* @param MetadataInterface $metadata
* @return string
*/
public function execute(string $data, MetadataInterface $metadata): string
{
$xml = simplexml_load_string($data);
$namespaces = $xml->getNamespaces(true);
foreach ($namespaces as $prefix => $url) {
$xml->registerXPathNamespace($prefix, $url);
}
if ($metadata->getTitle() === null) {
$this->deleteValueByXpath($xml, self::XMP_XPATH_SELECTOR_TITLE);
} else {
$this->setValueByXpath($xml, self::XMP_XPATH_SELECTOR_TITLE, $metadata->getTitle());
}
if ($metadata->getDescription() === null) {
$this->deleteValueByXpath($xml, self::XMP_XPATH_SELECTOR_DESCRIPTION);
} else {
$this->setValueByXpath($xml, self::XMP_XPATH_SELECTOR_DESCRIPTION, $metadata->getDescription());
}
if ($metadata->getKeywords() === null) {
$this->deleteValueByXpath($xml, self::XMP_XPATH_SELECTOR_KEYWORDS);
} else {
$this->updateKeywords($xml, $metadata->getKeywords());
}
$data = $xml->asXML();
return str_replace("<?xml version=\"1.0\"?>\n", '', $data);
}
/**
* Update keywords
*
* @param \SimpleXMLElement $xml
* @param array $keywords
*/
private function updateKeywords(\SimpleXMLElement $xml, array $keywords): void
{
foreach ($xml->xpath(self::XMP_XPATH_SELECTOR_KEYWORDS_EACH) as $keywordElement) {
unset($keywordElement[0]);
}
foreach ($xml->xpath(self::XMP_XPATH_SELECTOR_KEYWORDS) as $element) {
foreach ($keywords as $keyword) {
$element->addChild(self::XMP_XPATH_SELECTOR_KEYWORD_ITEM, $keyword);
}
}
}
/**
* Deletes xml node by xpath
*
* @param \SimpleXMLElement $xml
* @param string $xpath
*/
private function deleteValueByXpath(\SimpleXMLElement $xml, string $xpath): void
{
foreach ($xml->xpath($xpath) as $element) {
unset($element[0]);
}
}
/**
* Set value to xml node by xpath
*
* @param \SimpleXMLElement $xml
* @param string $xpath
* @param string $value
*/
private function setValueByXpath(\SimpleXMLElement $xml, string $xpath, string $value): void
{
foreach ($xml->xpath($xpath) as $element) {
$element[0] = $value;
}
}
}