public static function parse($xml)
{
$xrd = new XRD();
$dom = new DOMDocument();
// Don't spew XML warnings to output
$old = error_reporting();
error_reporting($old & ~E_WARNING);
$ok = $dom->loadXML($xml);
error_reporting($old);
if (!$ok) {
// TRANS: Exception.
throw new Exception(_m('Invalid XML.'));
}
$xrd_element = $dom->getElementsByTagName('XRD')->item(0);
if (!$xrd_element) {
// TRANS: Exception.
throw new Exception(_m('Invalid XML, missing XRD root.'));
}
// Check for host-meta host
$host = $xrd_element->getElementsByTagName('Host')->item(0);
if ($host) {
$xrd->host = $host->nodeValue;
}
// Loop through other elements
foreach ($xrd_element->childNodes as $node) {
if (!$node instanceof DOMElement) {
continue;
}
switch ($node->tagName) {
case 'Expires':
$xrd->expires = $node->nodeValue;
break;
case 'Subject':
$xrd->subject = $node->nodeValue;
break;
case 'Alias':
$xrd->alias[] = $node->nodeValue;
break;
case 'Link':
$xrd->links[] = $xrd->parseLink($node);
break;
case 'Type':
$xrd->types[] = $xrd->parseType($node);
break;
}
}
return $xrd;
}