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✏️ Editing: submit_question_version.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/>.

namespace mod_quiz\external;

defined('MOODLE_INTERNAL') || die();

require_once($CFG->dirroot . '/question/engine/lib.php');
require_once($CFG->dirroot . '/question/engine/datalib.php');
require_once($CFG->libdir . '/questionlib.php');

use core_external\external_api;
use core_external\external_function_parameters;
use core_external\external_single_structure;
use core_external\external_value;
use stdClass;

/**
 * External api for changing the question version in the quiz.
 *
 * @package    mod_quiz
 * @copyright  2021 Catalyst IT Australia Pty Ltd
 * @author     Safat Shahin <safatshahin@catalyst-au.net>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class submit_question_version extends external_api {

/**
     * Parameters for the submit_question_version.
     *
     * @return external_function_parameters
     */
    public static function execute_parameters(): external_function_parameters {
        return new external_function_parameters([
            'slotid' => new external_value(PARAM_INT, ''),
            'newversion' => new external_value(PARAM_INT, '')
        ]);
    }

/**
     * Set the questions slot parameters to display the question template.
     *
     * @param int $slotid Slot id to display.
     * @param int $newversion the version to set. 0 means 'always latest'.
     * @return array
     */
    public static function execute(int $slotid, int $newversion): array {
        global $DB;
        $params = [
            'slotid' => $slotid,
            'newversion' => $newversion
        ];
        $params = self::validate_parameters(self::execute_parameters(), $params);
        $response = [];
        // Get the required data.
        $referencedata = $DB->get_record('question_references',
            ['itemid' => $params['slotid'], 'component' => 'mod_quiz', 'questionarea' => 'slot']);
        $slotdata = $DB->get_record('quiz_slots', ['id' => $slotid]);

// Capability check.
        [, $cm] = get_course_and_cm_from_instance($slotdata->quizid, 'quiz');
        $context = \context_module::instance($cm->id);
        self::validate_context($context);
        require_capability('mod/quiz:manage', $context);

$reference = new stdClass();
        $reference->id = $referencedata->id;
        if ($params['newversion'] === 0) {
            $reference->version = null;
        } else {
            $reference->version = $params['newversion'];
        }
        $response['result'] = $DB->update_record('question_references', $reference);
        return $response;
    }

/**
     * Define the webservice response.
     *
     * @return \core_external\external_description
     */
    public static function execute_returns() {
        return new external_single_structure([
            'result' => new external_value(PARAM_BOOL, '')

]);
    }
}

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