Proyectos de Subversion Moodle

<?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/>.

use mod_quiz\form\preflight_check_form;

use mod_quiz\local\access_rule_base;

use mod_quiz\quiz_settings;

/**

 * A rule implementing the offlineattempts check.

 *

 * @package    quizaccess_offlineattempts

 * @copyright  2016 Juan Leyva

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 * @since      Moodle 3.2

 */

class quizaccess_offlineattempts extends access_rule_base {

    public static function make(quiz_settings $quizobj, $timenow, $canignoretimelimits) {

        global $CFG;

        // If mobile services are off, the user won't be able to use any external app.

        if (empty($CFG->enablemobilewebservice) or empty($quizobj->get_quiz()->allowofflineattempts)) {

            return null;

        }

        return new self($quizobj, $timenow);

    }

    public function is_preflight_check_required($attemptid) {

        global $SESSION, $DB;

        // First, check if the user did something offline.

        if (!empty($attemptid)) {

            $timemodifiedoffline = $DB->get_field('quiz_attempts', 'timemodifiedoffline', ['id' => $attemptid]);

            if (empty($timemodifiedoffline)) {

                return false;

            }

            return empty($SESSION->offlineattemptscheckedquizzes[$this->quiz->id]);

        } else {

            // Starting a new attempt, we don't have to check anything here.

            return false;

        }

    }

    public function add_preflight_check_form_fields(preflight_check_form $quizform,

            MoodleQuickForm $mform, $attemptid) {

        global $DB;

        $timemodifiedoffline = $DB->get_field('quiz_attempts', 'timemodifiedoffline', ['id' => $attemptid]);

        $lasttime = format_time(time() - $timemodifiedoffline);

        $mform->addElement('header', 'offlineattemptsheader', get_string('mobileapp', 'quizaccess_offlineattempts'));

        $mform->addElement('static', 'offlinedatamessage', '',

                get_string('offlinedatamessage', 'quizaccess_offlineattempts', $lasttime));

        $mform->addElement('advcheckbox', 'confirmdatasaved', null,

                get_string('confirmdatasaved', 'quizaccess_offlineattempts'));

    }

    public function validate_preflight_check($data, $files, $errors, $attemptid) {

        // The user confirmed that he doesn't have unsaved work.

        if (!empty($data['confirmdatasaved'])) {

            return $errors;

        }

        $errors['confirmdatasaved'] = get_string('pleaseconfirm', 'quizaccess_offlineattempts');

        return $errors;

    }

    public function notify_preflight_check_passed($attemptid) {

        global $SESSION;

        $SESSION->offlineattemptscheckedquizzes[$this->quiz->id] = true;

    }

    public function current_attempt_finished() {

        global $SESSION;

        // Clear the flag in the session that says that the user has already agreed to the notice.

        if (!empty($SESSION->offlineattemptscheckedquizzes[$this->quiz->id])) {

            unset($SESSION->offlineattemptscheckedquizzes[$this->quiz->id]);

        }

    }

    public static function add_settings_form_fields(

            mod_quiz_mod_form $quizform, MoodleQuickForm $mform) {

        global $CFG;

        // Allow to enable the access rule only if the Mobile services are enabled.

        if ($CFG->enablemobilewebservice) {

            $mform->addElement('selectyesno', 'allowofflineattempts',

                                get_string('allowofflineattempts', 'quizaccess_offlineattempts'));

            $mform->addHelpButton('allowofflineattempts', 'allowofflineattempts', 'quizaccess_offlineattempts');

            $mform->setDefault('allowofflineattempts', 0);

            $mform->setAdvanced('allowofflineattempts');

            $mform->disabledIf('allowofflineattempts', 'timelimit[number]', 'neq', 0);

            $mform->disabledIf('allowofflineattempts', 'subnet', 'neq', '');

            $mform->disabledIf('allowofflineattempts', 'navmethod', 'eq', 'sequential');

        }

    }

    public static function validate_settings_form_fields(array $errors,

            array $data, $files, mod_quiz_mod_form $quizform) {

        global $CFG;

        if ($CFG->enablemobilewebservice) {

            // Do not allow offline attempts if:

            // - The quiz uses a timer.

            // - The quiz is restricted by subnet.

            // - The question behaviour is not deferred feedback or deferred feedback with CBM.

            // - The quiz uses the sequential navigation.

            if (!empty($data['allowofflineattempts']) &&

                (!empty($data['timelimit']) || !empty($data['subnet']) ||

                $data['navmethod'] === 'sequential' ||

                ($data['preferredbehaviour'] != 'deferredfeedback' && $data['preferredbehaviour'] != 'deferredcbm'))) {

                $errors['allowofflineattempts'] = get_string('offlineattemptserror', 'quizaccess_offlineattempts');

            }

        }

        return $errors;

    }

}