<?php

/**
* @package   s9e\TextFormatter
* @copyright Copyright (c) 2010-2020 The s9e authors
* @license   http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\TextFormatter\Parser\AttributeFilters;

class NetworkFilter
{
	/**
	* Filter an IP value (includes IPv4 and IPv6)
	*
	* @param  string $attrValue Original value
	* @return mixed             Filtered value, or FALSE if invalid
	*/
	public static function filterIp($attrValue)
	{
		return filter_var($attrValue, FILTER_VALIDATE_IP);
	}

	/**
	* Filter an IP:port value (includes IPv4 and IPv6)
	*
	* @param  string $attrValue Original value
	* @return mixed             Filtered value, or FALSE if invalid
	*/
	public static function filterIpport($attrValue)
	{
		if (preg_match('/^\\[([^\\]]+)(\\]:[1-9][0-9]*)$/D', $attrValue, $m))
		{
			$ip = self::filterIpv6($m[1]);

			if ($ip === false)
			{
				return false;
			}

			return '[' . $ip . $m[2];
		}

		if (preg_match('/^([^:]+)(:[1-9][0-9]*)$/D', $attrValue, $m))
		{
			$ip = self::filterIpv4($m[1]);

			if ($ip === false)
			{
				return false;
			}

			return $ip . $m[2];
		}

		return false;
	}

	/**
	* Filter an IPv4 value
	*
	* @param  string $attrValue Original value
	* @return mixed             Filtered value, or FALSE if invalid
	*/
	public static function filterIpv4($attrValue)
	{
		return filter_var($attrValue, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
	}

	/**
	* Filter an IPv6 value
	*
	* @param  string $attrValue Original value
	* @return mixed             Filtered value, or FALSE if invalid
	*/
	public static function filterIpv6($attrValue)
	{
		return filter_var($attrValue, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);
	}
}