private function appendCustomUrls(Webspace $webspace, Context $context, JsonSerializationVisitor $visitor)
{
$customUrls = [];
foreach ($webspace->getPortals() as $portal) {
$customUrls = array_merge($customUrls, $this->getCustomUrlsForEnvironment($portal, $portal->getEnvironment($this->environment), $context));
}
$customUrls = $context->accept($customUrls);
$visitor->addData('customUrls', $customUrls);
}