/*
 * This is an auditd plugin for sending auditd data
 * to clickhouse DB.
 * Copyright (C) 2020 Aleksei Nikiforov <darktemplar@basealt.ru>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 *
 */

#ifndef AUDITD_PLUGIN_CLICKHOUSE_UTILS_HPP
#define AUDITD_PLUGIN_CLICKHOUSE_UTILS_HPP

#include <string>
#include <memory>
#include <boost/property_tree/ptree.hpp>

std::string string_or_null(const char *data);
std::string string_or_null_and_free(const char *data);
std::string sanitize_column_name(const std::string &name);
bool is_valid_table_name(const std::string &value);

template <typename T>
std::shared_ptr<T> ensure_not_null(const std::shared_ptr<T> &value)
{
	if (!value)
	{
		throw std::runtime_error("Invalid pointer cast");
	}

	return value;
}

template <typename T>
bool always_true(const T &)
{
	return true;
}

template <typename T>
void optional_set(T &value, const boost::property_tree::ptree &tree, const char *element_name, bool (*check_function)(const T &))
{
	auto element = tree.get_child_optional(element_name);
	if (element)
	{
		if (check_function(element->get_value<T>()))
		{
			value = element->get_value<T>();
		}
		else
		{
			throw std::runtime_error(std::string("Invalid value for option '") + std::string(element_name) + std::string("'"));
		}
	}
}

template <typename T>
void optional_set(T &value, const boost::property_tree::ptree &tree, const char *element_name)
{
	optional_set(value, tree, element_name, &always_true<T>);
}

#endif /* AUDITD_PLUGIN_CLICKHOUSE_UTILS_HPP */