protected function prepareForXml()
{
parent::prepareForXml();
if (!$this->getAssertionConsumerServiceURL()) {
throw new InvalidRequestException('AuthRequest AssertionConsumerServiceURL not set');
}
if (!$this->getProtocolBinding()) {
throw new InvalidRequestException('AuthnRequest ProtocolBinding not set');
}
if (!NameIDPolicy::isValid($this->getNameIdPolicyFormat())) {
throw new InvalidRequestException('AuthnRequest NameIDPolicy Format not set');
}
}