Current Path : C:/xampp/htdocs/moodle/lib/xapi/classes/external/ |
Current File : C:/xampp/htdocs/moodle/lib/xapi/classes/external/post_statement.php |
<?php // This file is part of Moodle - http://moodle.org/ // // Moodle 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 3 of the License, or // (at your option) any later version. // // Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>. /** * This is the external API for generic xAPI handling. * * @package core_xapi * @since Moodle 3.9 * @copyright 2020 Ferran Recio * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ namespace core_xapi\external; use core_xapi\local\statement; use core_xapi\handler; use core_xapi\xapi_exception; use external_api; use external_function_parameters; use external_value; use external_single_structure; use external_multiple_structure; use external_warnings; use core_component; defined('MOODLE_INTERNAL') || die(); require_once($CFG->libdir .'/externallib.php'); /** * This is the external API for generic xAPI handling. * * @copyright 2020 Ferran Recio * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class post_statement extends external_api { /** * Parameters for execute * * @return external_function_parameters */ public static function execute_parameters() { return new external_function_parameters( [ 'component' => new external_value(PARAM_COMPONENT, 'Component name', VALUE_REQUIRED), 'requestjson' => new external_value(PARAM_RAW, 'json object with all the statements to post', VALUE_REQUIRED) ] ); } /** * Process a statement post request. * * @param string $component component name (frankenstyle) * @param string $requestjson json object with all the statements to post * @return bool[] storing acceptance of every statement */ public static function execute(string $component, string $requestjson): array { $params = self::validate_parameters(self::execute_parameters(), array( 'component' => $component, 'requestjson' => $requestjson, )); $component = $params['component']; $requestjson = $params['requestjson']; static::validate_component($component); $handler = handler::create($component); $statements = self::get_statements_from_json($requestjson); if (!self::check_statements_users($statements, $handler)) { throw new xapi_exception('Statements actor is not the current user'); } $result = $handler->process_statements($statements); // In case no statement is processed, an error must be returned. if (count(array_filter($result)) == 0) { throw new xapi_exception('No statement can be processed.'); } return $result; } /** * Return for execute. */ public static function execute_returns() { return new external_multiple_structure( new external_value(PARAM_BOOL, 'If the statement is accepted'), 'List of statements storing acceptance results' ); } /** * Check component name. * * Note: this function is separated mainly for testing purposes to * be overridden to fake components. * * @throws xapi_exception if component is not available * @param string $component component name */ protected static function validate_component(string $component): void { // Check that $component is a real component name. $dir = core_component::get_component_directory($component); if (!$dir) { throw new xapi_exception("Component $component not available."); } } /** * Convert mulitple types of statement request into an array of statements. * * @throws xapi_exception if JSON cannot be parsed * @param string $requestjson json encoded statements structure * @return statement[] array of statements */ private static function get_statements_from_json(string $requestjson): array { $request = json_decode($requestjson); if ($request === null) { throw new xapi_exception('JSON error: '.json_last_error_msg()); } $result = []; if (is_array($request)) { foreach ($request as $data) { $result[] = statement::create_from_data($data); } } else { $result[] = statement::create_from_data($request); } if (empty($result)) { throw new xapi_exception('No statements detected'); } return $result; } /** * Check that $USER is actor in all statements. * * @param statement[] $statements array of statements * @param handler $handler specific xAPI handler * @return bool if $USER is actor in all statements */ private static function check_statements_users(array $statements, handler $handler): bool { global $USER; foreach ($statements as $statement) { if ($handler->supports_group_actors()) { $users = $statement->get_all_users(); if (!isset($users[$USER->id])) { return false; } } else { $user = $statement->get_user(); if ($user->id != $USER->id) { return false; } } } return true; } }