/**
* Converts all root-relative URLs to absolute URLs in RSS markup.
*
* Does not change any existing protocol-relative or absolute URLs.
*
* @param string $rss_markup
* The RSS markup to update.
* @param \Symfony\Component\HttpFoundation\Request $request
* The current request.
*
* @return string
* The updated RSS markup.
*/
protected function transformRootRelativeUrlsToAbsolute($rss_markup, Request $request)
{
$rss_dom = new \DOMDocument();
$rss_dom->loadXML($rss_markup);
// Invoke Html::transformRootRelativeUrlsToAbsolute() on all HTML content
// embedded in this RSS feed.
foreach ($rss_dom->getElementsByTagName('description') as $node) {
$html_markup = $node->nodeValue;
if (!empty($html_markup)) {
$node->nodeValue = Html::transformRootRelativeUrlsToAbsolute($html_markup, $request->getSchemeAndHttpHost());
}
}
return $rss_dom->saveXML();
}
