class.ilCaptchaUtil.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilCaptchaUtil
{
        const CONTEXT_FORUM        = 'frm';
        const CONTEXT_LOGIN        = 'auth';
        const CONTEXT_REGISTRATION = 'reg';
        const CONTEXT_WIKI         = 'wiki';

        protected static $context_map;

        public static function checkFreetype()
        {
                if(function_exists('imageftbbox'))
                {
                        return true;
                }
                return false;
        }

        public static function __callStatic($name, array $arguments = array())
        {
                if(
                        strpos($name, 'isActiveFor') === 0 ||
                        strpos($name, 'setActiveFor') === 0
                )
                {
                        $settings           = new ilSetting('cptch');
                        $supported_contexts = self::getSupportedContexts();
                        $method_parts       = explode('_', strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', $name)));
                        $requested_context  = strtolower($method_parts[count($method_parts) - 1]);
                        if(!isset($requested_context, self::$context_map))
                        {
                                throw new BadMethodCallException('Method ' . $name . ' called for a non existing context.');
                        }

                        if('set' == $method_parts[0])
                        {
                                $settings->set('activate_captcha_anonym_' . $supported_contexts[$requested_context], (int)$arguments[0]);
                                return;
                        }
                        else
                        {
                                return self::checkFreetype() && (bool)$settings->get('activate_captcha_anonym_' . $supported_contexts[$requested_context], false);
                        }
                }
                else
                {
                        throw new BadMethodCallException('Call to an undefined static method ' . $name . ' in class ' . __CLASS__ . '.');
                }
        }

        public static function getPreconditionsMessage()
        {
                global $lng;

                $lng->loadLanguageModule('cptch');
                return "<a target='_blank' href='http://php.net/manual/en/image.installation.php'>" . $lng->txt('cptch_freetype_support_needed') . "</a>";
        }

        private static function getSupportedContexts()
        {
                if(null !== self::$context_map)
                {
                        return self::$context_map;
                }

                self::$context_map = array();

                $r         = new ReflectionClass(new self());
                $constants = $r->getConstants();
                foreach($constants as $name => $value)
                {
                        if(strpos($name, 'CONTEXT_') === 0)
                        {
                                self::$context_map[strtolower(substr($name, strlen('CONTEXT_')))] = $value;
                        }
                }

                return self::$context_map;
        }
}