MDL-29627 refactor the way the rules are constructed from the quiz.
[moodle.git] / mod / quiz / accessrule / safebrowser / rule.php
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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 * Implementaton of the quizaccess_safebrowser plugin.
19 *
20 * @package quizaccess
21 * @subpackage safebrowser
22 * @copyright 2011 The Open University
23 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
24 */
25
26
27defined('MOODLE_INTERNAL') || die();
28
29require_once($CFG->dirroot . '/mod/quiz/accessrule/accessrulebase.php');
30
31
32/**
33* A rule representing the safe browser check.
34*
35* @copyright 2009 Oliver Rahs
36* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
37*/
ea38245c 38class quizaccess_safebrowser extends quiz_access_rule_base {
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39
40 public static function make(quiz $quizobj, $timenow, $canignoretimelimits) {
41
42 if ($quizobj->get_quiz()->popup != 2) {
43 return null;
44 }
45
46 return new self($quizobj, $timenow);
47 }
48
a28a5d74 49 public function prevent_access() {
ea38245c 50 if (!$this->check_safe_browser()) {
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51 return get_string('safebrowsererror', 'quiz');
52 } else {
53 return false;
54 }
55 }
56
57 public function description() {
1d9e1a3c 58 return get_string('safebrowsernotice', 'quiz');
a28a5d74 59 }
ea38245c 60
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61 public function setup_attempt_page($page) {
62 $page->set_title($this->quizobj->get_course()->shortname . ': ' . $page->title);
63 $page->set_cacheable(false);
64 }
65
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66 /**
67 * Checks if browser is safe browser
68 *
69 * @return true, if browser is safe browser else false
70 */
71 function check_safe_browser() {
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72 return strpos($_SERVER['HTTP_USER_AGENT'], 'SEB') !== false;
73 }
74
75 /**
76 * @return array key => lang string any choices to add to the quiz Browser
77 * security settings menu.
78 */
79 public static function get_browser_security_choices() {
80 global $CFG;
81
82 if (empty($CFG->enablesafebrowserintegration)) {
83 return array();
84 }
85
86 return array(2 => get_string('requiresafeexambrowser', 'quiz'));
ea38245c 87 }
a28a5d74 88}