BookStack/app/Entities/Tools/Markdown/CustomImageConverter.php

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<?php
namespace BookStack\Entities\Tools\Markdown;
use League\HTMLToMarkdown\Converter\ImageConverter;
use League\HTMLToMarkdown\ElementInterface;
class CustomImageConverter extends ImageConverter
{
public function convert(ElementInterface $element): string
{
$parent = $element->getParent();
// Remain as HTML if within diagram block.
$withinDrawing = $parent && !empty($parent->getAttribute('drawio-diagram'));
if ($withinDrawing) {
$src = e($element->getAttribute('src'));
$alt = e($element->getAttribute('alt'));
return "<img src=\"{$src}\" alt=\"{$alt}\"/>";
}
return parent::convert($element);
}
}