WB 2.08.x

<?php

/**

 *

 * @category        modules

 * @package         output_filter

 * @author          WebsiteBaker Project

 * @copyright       2004-2009, Ryan Djurovich

 * @copyright       2009-2011, Website Baker Org. e.V.

 * @link			http://www.websitebaker2.org/

 * @license         http://www.gnu.org/licenses/gpl.html

 * @platform        WebsiteBaker 2.8.x

 * @requirements    PHP 5.2.2 and higher

 * @version         $Id: filter-routines.php 1477 2011-07-21 02:47:28Z Luisehahne $

 * @filesource		$HeadURL: svn://isteam.dynxs.de/wb-archiv/branches/2.8.x/wb/modules/output_filter/filter-routines.php $

 * @lastmodified    $Date: 2011-07-21 04:47:28 +0200 (Thu, 21 Jul 2011) $

 *

 */

// Must include code to stop this file being access directly

if(defined('WB_PATH') == false) { die("Cannot access this file directly"); }

// function to read the current filter settings

if (!function_exists('get_output_filter_settings')) {

	function get_output_filter_settings() {

		global $database, $admin;

	// be sure field is in table (suppresses strict warning)

		$table_name = TABLE_PREFIX .'mod_output_filter';

		$field_name = 'sys_rel';

		$description = 'VARCHAR(1) NOT NULL DEFAULT \'0\'';

		$msg_flag = ($database->field_add($table_name,$field_name,$description ));

		// connect to database and read out filter settings

		$result = $database->query("SELECT * FROM " .TABLE_PREFIX ."mod_output_filter");

		if($result && $result->numRows() > 0) {

			// get all data

			$data = $result->fetchRow();

			$filter_settings['sys_rel'] = $admin->strip_slashes($data['sys_rel']);

			$filter_settings['email_filter'] = $admin->strip_slashes($data['email_filter']);

			$filter_settings['mailto_filter'] = $admin->strip_slashes($data['mailto_filter']);

			$filter_settings['at_replacement'] = $admin->strip_slashes($data['at_replacement']);

			$filter_settings['dot_replacement'] = $admin->strip_slashes($data['dot_replacement']);

		} else {

			// something went wrong, use default values

			$filter_settings['sys_rel'] = '0';

			$filter_settings['email_filter'] = '0';

			$filter_settings['mailto_filter'] = '0';

			$filter_settings['at_replacement'] = '(at)';

			$filter_settings['dot_replacement'] = '(dot)';

		}

		// return array with filter settings

		return $filter_settings;

	}

}

// function to filter the output before displaying it on the frontend

if (!function_exists('filter_frontend_output')) {

	function filter_frontend_output($content) {

		// get output filter settings from database

		$filter_settings = get_output_filter_settings();

		$location = '';

        if($filter_settings['sys_rel'] == '1'){

			if( !isset($_SERVER['HTTPS']) || strtolower($_SERVER['HTTPS']) == 'off' )

			{

				define('SYS_HTTPS', false);

				define('SYS_PORT', (($_SERVER['SERVER_PORT'] != '80') ? ':'.$_SERVER['SERVER_PORT'] : '') );

				define('SYS_PROTOCOL', 'http');

			}else

			{

				define('SYS_HTTPS', true);

				define('SYS_PORT', (($_SERVER['SERVER_PORT'] != '443') ? ':'.$_SERVER['SERVER_PORT'] : '') );

				define('SYS_PROTOCOL', 'https');

			}

			$tmp = '';

			if( isset($_SERVER['HTTP_HOST']) )

			{

				$tmp = $_SERVER['HTTP_HOST'];

			}elseif( isset($_SERVER['SERVER_NAME']) )

			{

				$tmp = $_SERVER['SERVER_NAME'];

			}

			define('WB_HOST', preg_replace('/:[0-9]*$/', '', $tmp));

	        $location = SYS_PROTOCOL.'://'.WB_HOST.SYS_PORT;

        }

		// work out the defined output filter mode: possible output filter modes: [0], 1, 2, 3, 6, 7

		// 2^0 * (0.. disable, 1.. enable) filtering of mail addresses in text

		// 2^1 * (0.. disable, 1.. enable) filtering of mail addresses in mailto links

		// 2^2 * (0.. disable, 1.. enable) Javascript mailto encryption (only if mailto filtering enabled)

		// only filter output if we are supposed to

		if($filter_settings['email_filter'] != '1' && $filter_settings['mailto_filter'] != '1'){

			$searchfor = '/(<.*?=\s*?\")(?:'.preg_quote($location, '/').')(.*?\".*?>)/i';

			$content = preg_replace($searchfor, '$1$2', $content);

			return $content;

		}

		// check if non mailto mail addresses needs to be filtered

		$output_filter_mode = ($filter_settings['email_filter'] == '1') ? 1 : 0;		// 0|1

		// check if mailto mail addresses needs to be filtered

		if($filter_settings['mailto_filter'] == '1') {

			$output_filter_mode = $output_filter_mode + 2;								// 0|2

			// check if Javascript mailto encryption is enabled (call register_frontend_functions in the template)

           $search_pattern = '/<.*src=\".*\/mdcr.js.*>/iU';

           if(preg_match($search_pattern, $content))

           {

            $output_filter_mode = $output_filter_mode + 4;       // 0|4

           }

/*

			$search = '<script src="' .WB_URL .'/modules/output_filter/js/mdcr.js" type="text/javascript"></script>';

			$search_droplet = '<script src="' .WB_URL .'/modules/droplets/js/mdcr.js" type="text/javascript"></script>';

			if(strpos($content, $search) !== false || strpos($content, $search_droplet) !== false) {

				$output_filter_mode = $output_filter_mode + 4;							// 0|4

			}

*/

		}

		// define some constants so we do not call the database in the callback function again

		define('OUTPUT_FILTER_MODE', (int) $output_filter_mode);

		define('OUTPUT_FILTER_AT_REPLACEMENT', $filter_settings['at_replacement']);

		define('OUTPUT_FILTER_DOT_REPLACEMENT', $filter_settings['dot_replacement']);

		// first search part to find all mailto email addresses

		$pattern = '#(<a[^<]*href\s*?=\s*?"\s*?mailto\s*?:\s*?)([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4})([^"]*?)"([^>]*>)(.*?)</a>';

		// second part to find all non mailto email addresses

		$pattern .= '|(value\s*=\s*"|\')??\b([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4})\b#i';

		/*

		Sub 1:\b(<a.[^<]*href\s*?=\s*?"\s*?mailto\s*?:\s*?)			-->	"<a id="yyy" class="xxx" href = " mailto :" ignoring white spaces

		Sub 2:([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4})			-->	the email address in the mailto: part of the mail link

		Sub 3:([^"]*?)"												--> possible ?Subject&cc... stuff attached to the mail address

		Sub 4:([^>]*>)												--> all class or id statements after the mailto but before closing ..>

		Sub 5:(.*?)</a>\b											--> the mailto text; all characters between >xxxxx</a>

		Sub 6:|\b([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4})\b		--> email addresses which may appear in the text (require word boundaries)

		*/

		// find all email addresses embedded in the content and filter them using a callback function

		$content = preg_replace_callback($pattern, 'filter_mail_addresses', $content);

		// href can't be empty

		$searchfor = '/(<.*?=\s*?\")(?:'.preg_quote($location, '/').')(.*?\".*?>)/i';

		$content = preg_replace($searchfor, '$1$2', $content);

		return $content;

	}

}		

// function to filter mail addresses embedded in text or mailto links before outputing them on the frontend

if (!function_exists('filter_mail_addresses')) {

	function filter_mail_addresses($match) { 

		// check if required output filter mode is defined

		if(!(defined('OUTPUT_FILTER_MODE') && defined('OUTPUT_FILTER_MODE') && defined('OUTPUT_FILTER_MODE'))) {

			return $match[0];

		}

		$search = array('@', '.');

		$replace = array(OUTPUT_FILTER_AT_REPLACEMENT ,OUTPUT_FILTER_DOT_REPLACEMENT);

		// check if the match contains the expected number of subpatterns (6|8)

		if(count($match) == 8) {

			/**

				OUTPUT FILTER FOR EMAIL ADDRESSES EMBEDDED IN TEXT

			**/

			// 1.. text mails only, 3.. text mails + mailto (no JS), 7 text mails + mailto (JS)

			if(!in_array(OUTPUT_FILTER_MODE, array(1,3,7))) return $match[0];

			// do not filter mail addresses included in input tags (<input ... value = "test@mail)

			if (strpos($match[6], 'value') !== false) return $match[0];

			// filtering of non mailto email addresses enabled

			return str_replace($search, $replace, $match[0]);

		} elseif(count($match) == 6) {

			/**

				OUTPUT FILTER FOR EMAIL ADDRESSES EMBEDDED IN MAILTO LINKS

			**/

			// 2.. mailto only (no JS), 3.. text mails + mailto (no JS), 6.. mailto only (JS), 7.. all filters active

			if(!in_array(OUTPUT_FILTER_MODE, array(2,3,6,7))) return $match[0];

			// check if last part of the a href link: >xxxx</a> contains a email address we need to filter

			$pattern = '#[A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4}#i';

			if(preg_match_all($pattern, $match[5], $matches)) {

				foreach($matches as $submatch) {

					foreach($submatch as $value) {

						// replace all . and all @ in email address parts by (dot) and (at) strings

						$match[5] = str_replace($value, str_replace($search, $replace, $value), $match[5]);

					}

				}

			}

			// check if Javascript encryption routine is enabled

			if(in_array(OUTPUT_FILTER_MODE, array(6,7))) {

				/** USE JAVASCRIPT ENCRYPTION FOR MAILTO LINKS **/

				// extract possible class and id attribute from ahref link

				preg_match('/class\s*?=\s*?("|\')(.*?)\1/ix', $match[0], $class_attr);

				$class_attr = empty($class_attr) ? '' : 'class="' . $class_attr[2] . '" ';

				preg_match('/id\s*?=\s*?("|\')(.*?)\1/ix', $match[0], $id_attr);

				$id_attr = empty($id_attr) ? '' : 'id="' . $id_attr[2] . '" ';

				// preprocess mailto link parts for further usage

				$search = array('@', '.', '_', '-'); $replace = array('F', 'Z', 'X', 'K');

				$email_address = str_replace($search, $replace, strtolower($match[2]));

				$email_subject = rawurlencode(html_entity_decode($match[3]));

				// create a random encryption key for the Caesar cipher

				mt_srand((double)microtime()*1000000);	// (PHP < 4.2.0)

				$shift = mt_rand(1, 25);

				// encrypt the email using an adapted Caesar cipher

		  		$encrypted_email = "";

				for($i = strlen($email_address) -1; $i > -1; $i--) {

					if(preg_match('#[FZXK0-9]#', $email_address[$i], $characters)) {

						$encrypted_email .= $email_address[$i];

					} else {	

						$encrypted_email .= chr((ord($email_address[$i]) -97 + $shift) % 26 + 97);

					}

				}

				$encrypted_email .= chr($shift + 97);

				// build the encrypted Javascript mailto link

				$mailto_link  = "<a {$class_attr}{$id_attr}href=\"javascript:mdcr('$encrypted_email','$email_subject')\">" .$match[5] ."</a>";

				return $mailto_link;	

			} else {

				/** DO NOT USE JAVASCRIPT ENCRYPTION FOR MAILTO LINKS **/

				// as minimum protection, replace replace @ in the mailto part by (at)

				// dots are not transformed as this would transform my.name@domain.com into: my(dot)name(at)domain(dot)com

				// rebuild the mailto link from the subpatterns (at the missing characters " and </a>")

				return $match[1] .str_replace('@', OUTPUT_FILTER_AT_REPLACEMENT, $match[2]) .$match[3] .'"' .$match[4] .$match[5] .'</a>';

				// if you want to protect both, @ and dots, comment out the line above and remove the comment from the line below

				// return $match[1] .str_replace($search, $replace, $match[2]) .$match[3] .'"' .$match[4] .$match[5] .'</a>';

			}

		}

		// number of subpatterns do not match the requirements ... do nothing

		return $match[0];

	}		

}