Template::getFieldsAction

public function getFieldsAction(BitrixDocumentGeneratorTemplate $template, $providerClassName = null, $value = null, array $values = [], CRestServer $restServer = null)
{
	if($restServer)
	{
		$providerClassName = Rest::class;
		$value = 1;
	}
	$template->setSourceType($providerClassName);
	if($template->isDeleted())
	{
		$this->errorCollection[] = new Error('Cannot get fields from deleted template');
		return null;
	}
	$document = BitrixDocumentGeneratorDocument::createByTemplate($template, $value);
	if(!$document->hasAccess())
	{
		$this->errorCollection[] = new Error('Access denied', static::ERROR_ACCESS_DENIED);
		return null;
	}
	$fields = $document->setValues($values)->getFields([], true, true);
	foreach($fields as &$field)
	{
		$field = $this->convertKeysToCamelCase($field);
	}
	return ['templateFields' => $fields];
}