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<?php defined('SYSPATH') or die('No direct script access.');
/**
* Security helper class.
*
* $Id: security.php 1725 2008-01-17 16:38:59Z PugFish $
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class security {

/**
* Sanitize a string with the xss_clean method.
*
* @param string string to sanitize
* @return string
*/
public static function xss_clean($str)
{
static $input;

if ($input === NULL)
{
$input = new Input();
}

return $input->xss_clean($str);
}

/**
* Remove image tags from a string.
*
* @param string string to sanitize
* @return string
*/
public static function strip_image_tags($str)
{
$str = preg_replace('#<img\b.*?(?:src\s*=\s*["\']?([^"\'<>\s]*)["\']?[^>]*)?>#is', '$1', $str);

return trim($str);
}

/**
* Remove PHP tags from a string.
*
* @param string string to sanitize
* @return string
*/
public static function encode_php_tags($str)
{
return str_replace(array('<?', '?>'), array('&lt;?', '?&gt;'), $str);
}

/**
* @author Michal Kliment
* Generate security password from capital and small letters and numbers
* @param $char_count
* @return password
*/
public static function generate_password($char_count = 8)
{

$password = '';

for ($i = 1; $i <= $char_count; $i++)
{
$rand = mt_rand(0, 2);
if ($rand == 0)
{
// capital letters
$password .= chr(mt_rand(65, 90));
}
elseif ($rand == 1)
{
// small letters
$password .= chr(mt_rand(97, 122));
}
else
{
// numbers
$password .= chr(mt_rand(48, 57));
}
}

return $password;

}

/**
* @author Michal Kliment
* Generate security password from numbers
* @param $char_count
* @return password
*/
public static function generate_numeric_password($char_count = 8)
{

$password = '';

for ($i = 1; $i <= $char_count; $i++)
{
$password .= chr(mt_rand(48, 57));
}

return $password;
}

} // End security
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