mod/quiz/autosave.ajax.php

   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 /**
  18  * Thisscript processes ajax auto-save requests during the quiz.
  19  *
  20  * @package    mod_quiz
  21  * @copyright  2013 The Open University
  22  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24
  25 define('AJAX_SCRIPT', true);
  26
  27 require_once(__DIR__ . '/../../config.php');
  28 require_once($CFG->dirroot . '/mod/quiz/locallib.php');
  29
  30 // Remember the current time as the time any responses were submitted
  31 // (so as to make sure students don't get penalized for slow processing on this page).
  32 $timenow = time();
  33 require_sesskey();
  34
  35 // Get submitted parameters.
  36 $attemptid = required_param('attempt',  PARAM_INT);
  37 $thispage  = optional_param('thispage', 0, PARAM_INT);
  38 $cmid      = optional_param('cmid', null, PARAM_INT);
  39
  40 $transaction = $DB->start_delegated_transaction();
  41 $attemptobj = quiz_create_attempt_handling_errors($attemptid, $cmid);
  42
  43 // Check login.
  44 require_login($attemptobj->get_course(), false, $attemptobj->get_cm());
  45
  46 // Check that this attempt belongs to this user.
  47 if ($attemptobj->get_userid() != $USER->id) {
  48     throw new moodle_exception('notyourattempt', 'quiz', $attemptobj->view_url());
  49 }
  50
  51 // Check capabilities.
  52 if (!$attemptobj->is_preview_user()) {
  53     $attemptobj->require_capability('mod/quiz:attempt');
  54 }
  55
  56 // If the attempt is already closed, send them to the review page.
  57 if ($attemptobj->is_finished()) {
  58     throw new moodle_exception('attemptalreadyclosed', 'quiz', $attemptobj->review_url());
  59 }
  60
  61 $attemptobj->process_auto_save($timenow);
  62 $transaction->allow_commit();
  63
  64 // Calculate time remaining.
  65 $timeleft = $attemptobj->get_time_left_display($timenow);
  66
  67 // Build response, only returning timeleft if quiz in-progress
  68 // has a time limit.
  69 $r = new stdClass();
  70 $r->status = "OK";
  71 if ($timeleft !== false) {
  72     $r->timeleft = $timeleft;
  73 }
  74 echo json_encode($r);