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<?php /** * Register course widget. * Handles user's registration action. * Display a register to course form if required. * * @copyright (c) 2011 University of Geneva * @license GNU General Public License - http://www.gnu.org/copyleft/gpl.html * @author Laurent Opprecht / class RegisterCourseWidget { const ACTION_SUBSCRIBE = 'subscribe'; const PARAM_SUBSCRIBE = 'subscribe'; const PARAM_PASSCODE = 'course_registration_code'; /* * Returns $_POST data for $key is it exists or $default otherwise. * * @param string $key * @param object $default * @return string / public static function post($key, $default = '') { return isset($_POST[$key]) ? $_POST[$key] : $default; } /* * Returns $_GET data for $key is it exists or $default otherwise. * * @param string $key * @param object $default * @return string / public static function get($key, $default = '') { return isset($_GET[$key]) ? $_GET[$key] : $default; } /* * * @return RegisterCourseWidget / public static function factory() { return new self(); } function run() { return $this->action_subscribe_user(); } /* * Handle the subscribe action. * * @return bool / function action_subscribe_user() { $action = self::get('action'); if ($action != self::ACTION_SUBSCRIBE) { return false; } $course_code = self::post(self::PARAM_SUBSCRIBE); if (empty($course_code)) { return false; } $registration_code = self::post(self::PARAM_PASSCODE); if ($this->subscribe_user($course_code, $registration_code)) { Display::display_confirmation_message(get_lang('EnrollToCourseSuccessful')); return; } if (!empty($registration_code)) { Display::display_error_message(get_lang('CourseRegistrationCodeIncorrect')); } $this->display_form($course_code); return true; } /* * Regiser a user to a course. * Returns true on success, false otherwise. * * @param string $course_code * @param string $registration_code * @param int $user_id * @return bool / function subscribe_user($course_code, $registration_code = '', $user_id = null) { $course = $this->retrieve_course($course_code); $course_regisration_code = $course['registration_code']; if (!empty($course_regisration_code) && $registration_code != $course_regisration_code) { return false; } if (empty($user_id)) { global $_user; $user_id = $_user['user_id']; } return (bool) CourseManager::add_user_to_course($user_id, $course_code); } /* * Display the course registration form. * Asks for registration code/password. * * @param string $course_code / function display_form($course_code) { global $stok; $course = $this->retrieve_course($course_code); $self = $_SERVER['REQUEST_URI']; $course_code = $course['code']; $course_visual_code = $course['visual_code']; $course_title = $course['title']; $submit_registration_code_label = get_lang("SubmitRegistrationCode"); $course_requires_password_label = get_lang('CourseRequiresPassword'); $result = <<<EOT $course_requires_password_label<br/> $course_visual_code - $course_title <form action="$self" method="post"> <input type="hidden" name="sec_token" value="$stok" /> <input type="hidden" name="subscribe" value="$course_code" /> <input type="text" name="course_registration_code" value="$registration_code" /> <input type="Submit" name="submit_course_registration_code" value="OK" alt="$submit_registration_code_label" /></form> EOT; echo $result; } /* * DB functions - DB functions - DB functions / /* * * @param type $course_code * @return type */ function retrieve_course($course_code) { require_once api_get_path(SYS_PATH) . '/main/inc/lib/course.lib.php'; return CourseManager::get_course_information($course_code); } }

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