/**
* Challenge string received.
*
* @param XMLEvent $event XML event
* @return void
*/
public function challenge(XMLEvent $event)
{
if ($event->isEndTag()) {
list($element) = $event->getParameters();
$challenge = XML::base64Decode($element->nodeValue);
$values = $this->parseCallenge($challenge);
if (isset($values['nonce'])) {
$send = '<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl">' . $this->response($values) . '</response>';
} elseif (isset($values['rspauth'])) {
$send = '<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl"/>';
} else {
throw new AuthenticationErrorException("Error when receiving challenge: \"{$challenge}\"");
}
$this->getConnection()->send($send);
}
}
