Créer un Captcha

<?php 
/*##################################################
 *                            QuestionCaptcha.class.php
 *                            -------------------
 *   begin                : May 9, 2014
 *   copyright            : (C) 2014 Julien BRISWALTER
 *   email                : j1.seth@phpboost.com
 *
 *
 ###################################################
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 ###################################################*/
 
class QuestionCaptcha extends Captcha
{
    private static $questions;
 
    public static function __static()
    {
        self::$questions = QuestionCaptchaConfig::load()->get_questions();
    }
 
    public function get_name()
    {
        return 'QuestionCaptcha';
    }
 
    public function is_available()
    {
        return true;
    }
 
    public function is_valid()
    {
        if (!$this->is_available() || AppContext::get_current_user()->check_level(User::MEMBER_LEVEL))
        {
            return true;
        }
 
        $answer = AppContext::get_request()->get_value($this->get_html_id(), '');
        $question_id = AppContext::get_request()->get_int($this->get_html_id() . '_question_id', 0);
 
        if (!empty($question_id))
        {
            $question = new QuestionCaptchaQuestion();
            $question->set_properties(self::$questions[$question_id]);
 
            return in_array(trim(strtolower($answer)), $question->get_formated_answers());
        }
        return false;
    }
 
    public function display()
    {
        $question_id = array_rand(self::$questions); //Question aléatoire
 
        $question = new QuestionCaptchaQuestion();
        $question->set_properties(self::$questions[$question_id]);
 
        $tpl = new FileTemplate('QuestionCaptcha/QuestionCaptcha.tpl');
        $tpl->put_all(array(
            'QUESTION_ID' => $question_id,
            'QUESTION' => $question->get_label(),
            'HTML_ID' => $this->get_html_id()
        ));
 
        return $tpl->render();
    }
}
?>

<?php
/*##################################################
 *                    QuestionCaptchaExtensionPointProvider.class.php
 *                            -------------------
 *   begin                : May 9, 2014
 *   copyright            : (C) 2014 Julien BRISWALTER
 *   email                : j1.seth@phpboost.com
 *
 *
 ###################################################
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 ###################################################*/
 
class QuestionCaptchaExtensionPointProvider extends ExtensionPointProvider
{
    public function __construct()
    {
        parent::__construct('QuestionCaptcha');
    }
 
    public function captcha()
    {
        return new QuestionCaptcha();
    }
 
    public function css_files()
    {
        $module_css_files = new ModuleCssFiles();
        $module_css_files->adding_running_module_displayed_file('QuestionCaptcha.css');
        return $module_css_files;
    }
 
    public function url_mappings()
    {
        return new UrlMappings(array(new DispatcherUrlMapping('/QuestionCaptcha/index.php')));
    }
}
?>