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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  HTML
 *
 * @copyright   Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Utility class for cloaking email adresses
 *
 * @package     Joomla.Platform
 * @subpackage  HTML
 * @since       11.1
 */
abstract class JHtmlEmail
{
	/**
	* Simple Javascript email Cloaker
	*
	* By default replaces an email with a mailto link with email cloaked
	* 
	* @param  string   $mail    The -mail address to cloak.
	* @param  boolean  $mailto  True if text and mailing address differ
	* @param  string   $text    Text for the link
	* @param  boolean  $email   True if text is an e-mail address
	* 
	* @return  string  The cloaked email.
	* 
	* @since   11.1
	*/
	public static function cloak($mail, $mailto=1, $text='', $email=1)
	{
		// Convert text
		$mail			= JHtmlEmail::_convertEncoding($mail);
		// Split email by @ symbol
		$mail			= explode('@', $mail);
		$mail_parts		= explode('.', $mail[1]);
		// Random number
		$rand			= rand(1, 100000);

$replacement	= "\n <script type='text/javascript'>";
		$replacement	.= "\n <!--";
		$replacement	.= "\n var prefix = 'ma' + 'il' + 'to';";
		$replacement	.= "\n var path = 'hr' + 'ef' + '=';";
		$replacement	.= "\n var addy". $rand ." = '". @$mail[0] ."' + '@';";
		$replacement	.= "\n addy". $rand ." = addy". $rand ." + '". implode("' + '.' + '", $mail_parts) ."';";

if ($mailto) {
			// Special handling when mail text is different from mail address
			if ($text) {
				if ($email) {
					// Convert text
					$text			= JHtmlEmail::_convertEncoding($text);
					// Split email by @ symbol
					$text			= explode('@', $text);
					$text_parts		= explode('.', $text[1]);
					$replacement	.= "\n var addy_text". $rand ." = '". @$text[0] ."' + '@' + '". implode("' + '.' + '", @$text_parts) ."';";
				} else {
					$replacement	.= "\n var addy_text". $rand ." = '". $text ."';";
				}
				$replacement	.= "\n document.write('<a ' + path + '\'' + prefix + ':' + addy". $rand ." + '\'>');";
				$replacement	.= "\n document.write(addy_text". $rand .");";
				$replacement	.= "\n document.write('<\/a>');";
			} else {
				$replacement	.= "\n document.write('<a ' + path + '\'' + prefix + ':' + addy". $rand ." + '\'>');";
				$replacement	.= "\n document.write(addy". $rand .");";
				$replacement	.= "\n document.write('<\/a>');";
			}
		} else {
			$replacement	.= "\n document.write(addy". $rand .");";
		}
		$replacement	.= "\n //-->";
		$replacement	.= '\n </script>';

// XHTML compliance no Javascript text handling
		$replacement	.= "<script type='text/javascript'>";
		$replacement	.= "\n ";
		$replacement	.= "\n </script>";
		$replacement	.= JText::_('JLIB_HTML_CLOAKING');
		$replacement	.= "\n <script type='text/javascript'>";
		$replacement	.= "\n ";
		$replacement	.= "\n </script>";

return $replacement;
	}
	/**
	* Convrt encoded text
	*
	* @param  string   $text    Text to convert
	* 
	* @return  string  The converted text.
	* 
	* @since   11.1
	*/
	protected static function _convertEncoding($text)
	{
		// Replace vowels with character encoding
		$text	= str_replace('a', 'a', $text);
		$text	= str_replace('e', 'e', $text);
		$text	= str_replace('i', 'i', $text);
		$text	= str_replace('o', 'o', $text);
		$text	= str_replace('u', 'u', $text);

return $text;
	}
}