root/spiderbouncer/files/lib/system/event/listener/AbstractPageSpiderBouncerListener.class.php @ 23

<?php
// WCF includes
require_once(WCF_DIR.'lib/system/event/EventListener.class.php');

/**
 * The bouncer overwrites matching spidersettings with regular expressions
 *
 * @author      Torben Brodt
 * @package     de.easy-coding.wcf.spiderbouncer
 * @license     GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 */
class AbstractPageSpiderBouncerListener implements EventListener {

        /**
         * evaluate patterns
         * @param patterns -> textstring
         * @param url -> url
         */
        protected function evaluateSingle($patterns, $url) {
                $patterns = explode("\n", StringUtil::unifyNewlines($patterns));
                try {
                        foreach ($patterns as $pattern) {
                                if(preg_match("/{$pattern}/", $url)) {
                                        return true;
                                }
                        }

                } catch (Exception $e) {
                        return false;
                }

                return false;
        }

        /**
         * evaluate patterns
         * @param allow -> textstring
         * @param disallow -> textstring
         * @param url -> url
         * @return -> -1 if undefined
         */
        public function evaluate($allow, $disallow, $url) {
                if($allow && $this->evaluateSingle($allow, $url)) {
                        return true;
                }
                
                if($disallow && $this->evaluateSingle($disallow, $url)) {
                        return false;
                }
                
                return -1;
        }

        /**
         * @see EventListener::execute()
         */
        public function execute($eventObj, $className, $eventName) {
                $result = $this->evaluate(SPIDERBOUNCER_ALLOW_REGEX, SPIDERBOUNCER_DISALLOW_REGEX, substr($_SERVER['REQUEST_URI'],1));
                if(intval($result) != -1) WCF::getTPL()->assign('allowSpidersToIndexThisPage', (boolean)$result);
        }
}
?>