email.php

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<?php
/**
* @version		$Id: email.php 11236 2008-11-02 02:44:35Z ian $
* @package		Joomla.Framework
* @subpackage	HTML
* @copyright	Copyright (C) 2005 - 2008 Open Source Matters. All rights reserved.
* @license		GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/

/**
 * Utility class for cloaking email adresses
 *
 * @static
 * @package 	Joomla.Framework
 * @subpackage	HTML
 * @since		1.5
 */
class JHTMLEmail
{
	/**
	* Simple Javascript email Cloaker
	*
 	* By default replaces an email with a mailto link with email cloacked
	*/
	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 language='JavaScript' type='text/javascript'>";
		$replacement 	.= "\n <!--";
		$replacement 	.= "\n var prefix = '&#109;a' + 'i&#108;' + '&#116;o';";
		$replacement 	.= "\n var path = 'hr' + 'ef' + '=';";
		$replacement 	.= "\n var addy". $rand ." = '". @$mail[0] ."' + '&#64;';";
		$replacement 	.= "\n addy". $rand ." = addy". $rand ." + '". implode( "' + '&#46;' + '", $mail_parts ) ."';";

		if ( $mailto ) {
			// special handling when mail text is different from mail addy
			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] ."' + '&#64;' + '". implode( "' + '&#46;' + '", @$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 language='JavaScript' type='text/javascript'>";
		$replacement 	.= "\n <!--";
		$replacement 	.= "\n document.write( '<span style=\'display: none;\'>' );";
		$replacement 	.= "\n //-->";
		$replacement 	.= "\n </script>";
		$replacement 	.= JText::_('CLOAKING');
		$replacement 	.= "\n <script language='JavaScript' type='text/javascript'>";
		$replacement 	.= "\n <!--";
		$replacement 	.= "\n document.write( '</' );";
		$replacement 	.= "\n document.write( 'span>' );";
		$replacement 	.= "\n //-->";
		$replacement 	.= "\n </script>";

		return $replacement;
	}

	function _convertEncoding( $text )
	{
		// replace vowels with character encoding
		$text 	= str_replace( 'a', '&#97;', $text );
		$text 	= str_replace( 'e', '&#101;', $text );
		$text 	= str_replace( 'i', '&#105;', $text );
		$text 	= str_replace( 'o', '&#111;', $text );
		$text	= str_replace( 'u', '&#117;', $text );

		return $text;
	}
}