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<?php
/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
namespace Icinga\Web\Helper\Markdown;
use HTMLPurifier_AttrTransform;
use HTMLPurifier_Config;
use ipl\Web\Url;
class LinkTransformer extends HTMLPurifier_AttrTransform
{
/**
* Link targets that are considered to have a thumbnail
*
* @var string[]
*/
public static $IMAGE_FILES = [
'jpg',
'jpeg',
'png',
'bmp',
'gif',
'heif',
'heic',
'webp'
];
public function transform($attr, $config, $context)
{
if (! isset($attr['href'])) {
return $attr;
}
$url = Url::fromPath($attr['href']);
$fileName = basename($url->getPath());
$ext = null;
if (($extAt = strrpos($fileName, '.')) !== false) {
$ext = substr($fileName, $extAt + 1);
}
$hasThumbnail = $ext !== null && in_array($ext, static::$IMAGE_FILES, true);
if ($hasThumbnail) {
// I would have liked to not only base this off of the extension, but also by
// whether there is an actual img tag inside the anchor. Seems not possible :(
$attr['class'] = 'with-thumbnail';
}
if (! isset($attr['target'])) {
if ($url->isExternal()) {
$attr['target'] = '_blank';
} else {
$attr['data-base-target'] = '_next';
}
}
return $attr;
}
public static function attachTo(HTMLPurifier_Config $config)
{
$module = $config->getHTMLDefinition(true)
->getAnonymousModule();
if (isset($module->info['a'])) {
$a = $module->info['a'];
} else {
$a = $module->addBlankElement('a');
}
$a->attr_transform_post[] = new self();
}
}
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