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Differences Between: [Versions 310 and 402] [Versions 311 and 402] [Versions 39 and 402] [Versions 400 and 402] [Versions 401 and 402]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  use mod_quiz\form\preflight_check_form;
  18  use mod_quiz\local\access_rule_base;
  19  use mod_quiz\quiz_settings;
  20  
  21  /**
  22   * A rule implementing the offlineattempts check.
  23   *
  24   * @package    quizaccess_offlineattempts
  25   * @copyright  2016 Juan Leyva
  26   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  27   * @since      Moodle 3.2
  28   */
  29  class quizaccess_offlineattempts extends access_rule_base {
  30  
  31      public static function make(quiz_settings $quizobj, $timenow, $canignoretimelimits) {
  32          global $CFG;
  33  
  34          // If mobile services are off, the user won't be able to use any external app.
  35          if (empty($CFG->enablemobilewebservice) or empty($quizobj->get_quiz()->allowofflineattempts)) {
  36              return null;
  37          }
  38  
  39          return new self($quizobj, $timenow);
  40      }
  41  
  42      public function is_preflight_check_required($attemptid) {
  43          global $SESSION, $DB;
  44  
  45          // First, check if the user did something offline.
  46          if (!empty($attemptid)) {
  47              $timemodifiedoffline = $DB->get_field('quiz_attempts', 'timemodifiedoffline', ['id' => $attemptid]);
  48              if (empty($timemodifiedoffline)) {
  49                  return false;
  50              }
  51              return empty($SESSION->offlineattemptscheckedquizzes[$this->quiz->id]);
  52          } else {
  53              // Starting a new attempt, we don't have to check anything here.
  54              return false;
  55          }
  56      }
  57  
  58      public function add_preflight_check_form_fields(preflight_check_form $quizform,
  59              MoodleQuickForm $mform, $attemptid) {
  60          global $DB;
  61  
  62          $timemodifiedoffline = $DB->get_field('quiz_attempts', 'timemodifiedoffline', ['id' => $attemptid]);
  63          $lasttime = format_time(time() - $timemodifiedoffline);
  64  
  65          $mform->addElement('header', 'offlineattemptsheader', get_string('mobileapp', 'quizaccess_offlineattempts'));
  66          $mform->addElement('static', 'offlinedatamessage', '',
  67                  get_string('offlinedatamessage', 'quizaccess_offlineattempts', $lasttime));
  68          $mform->addElement('advcheckbox', 'confirmdatasaved', null,
  69                  get_string('confirmdatasaved', 'quizaccess_offlineattempts'));
  70      }
  71  
  72      public function validate_preflight_check($data, $files, $errors, $attemptid) {
  73  
  74          // The user confirmed that he doesn't have unsaved work.
  75          if (!empty($data['confirmdatasaved'])) {
  76              return $errors;
  77          }
  78  
  79          $errors['confirmdatasaved'] = get_string('pleaseconfirm', 'quizaccess_offlineattempts');
  80          return $errors;
  81      }
  82  
  83      public function notify_preflight_check_passed($attemptid) {
  84          global $SESSION;
  85          $SESSION->offlineattemptscheckedquizzes[$this->quiz->id] = true;
  86      }
  87  
  88      public function current_attempt_finished() {
  89          global $SESSION;
  90          // Clear the flag in the session that says that the user has already agreed to the notice.
  91          if (!empty($SESSION->offlineattemptscheckedquizzes[$this->quiz->id])) {
  92              unset($SESSION->offlineattemptscheckedquizzes[$this->quiz->id]);
  93          }
  94      }
  95  
  96      public static function add_settings_form_fields(
  97              mod_quiz_mod_form $quizform, MoodleQuickForm $mform) {
  98          global $CFG;
  99  
 100          // Allow to enable the access rule only if the Mobile services are enabled.
 101          if ($CFG->enablemobilewebservice) {
 102              $mform->addElement('selectyesno', 'allowofflineattempts',
 103                                  get_string('allowofflineattempts', 'quizaccess_offlineattempts'));
 104              $mform->addHelpButton('allowofflineattempts', 'allowofflineattempts', 'quizaccess_offlineattempts');
 105              $mform->setDefault('allowofflineattempts', 0);
 106              $mform->setAdvanced('allowofflineattempts');
 107              $mform->disabledIf('allowofflineattempts', 'timelimit[number]', 'neq', 0);
 108              $mform->disabledIf('allowofflineattempts', 'subnet', 'neq', '');
 109              $mform->disabledIf('allowofflineattempts', 'navmethod', 'eq', 'sequential');
 110          }
 111      }
 112  
 113      public static function validate_settings_form_fields(array $errors,
 114              array $data, $files, mod_quiz_mod_form $quizform) {
 115          global $CFG;
 116  
 117          if ($CFG->enablemobilewebservice) {
 118              // Do not allow offline attempts if:
 119              // - The quiz uses a timer.
 120              // - The quiz is restricted by subnet.
 121              // - The question behaviour is not deferred feedback or deferred feedback with CBM.
 122              // - The quiz uses the sequential navigation.
 123              if (!empty($data['allowofflineattempts']) &&
 124                  (!empty($data['timelimit']) || !empty($data['subnet']) ||
 125                  $data['navmethod'] === 'sequential' ||
 126                  ($data['preferredbehaviour'] != 'deferredfeedback' && $data['preferredbehaviour'] != 'deferredcbm'))) {
 127  
 128                  $errors['allowofflineattempts'] = get_string('offlineattemptserror', 'quizaccess_offlineattempts');
 129              }
 130          }
 131  
 132          return $errors;
 133      }
 134  }