MDL-27809 navigation: Reworked the caching within navigation and improved the orderin...
[moodle.git] / course / switchrole.php
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7d2a0492 1<?php
d9cb06dc 2
7d2a0492 3// This file is part of Moodle - http://moodle.org/
4//
5// Moodle is free software: you can redistribute it and/or modify
6// it under the terms of the GNU General Public License as published by
7// the Free Software Foundation, either version 3 of the License, or
8// (at your option) any later version.
9//
10// Moodle is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
17
18/**
19 * The purpose of this file is to allow the user to switch roles and be redirected
20 * back to the page that they were on.
21 *
22 * This functionality is also supported in {@link /course/view.php} in order to comply
23 * with backwards compatibility
24 * The reason that we created this file was so that user didn't get redirected back
25 * to the course view page only to be redirected again.
26 *
27 * @since 2.0
d9cb06dc 28 * @package course
7d2a0492 29 * @copyright 2009 Sam Hemelryk
30 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
31 */
32
33require_once('../config.php');
34require_once($CFG->dirroot.'/course/lib.php');
35
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36$id = required_param('id', PARAM_INT);
37$switchrole = optional_param('switchrole',-1, PARAM_INT);
38$returnurl = optional_param('returnurl', false, PARAM_URL);
7d2a0492 39
a6855934 40$PAGE->set_url('/course/switchrole.php', array('id'=>$id));
d9cb06dc 41
7d2a0492 42if (!confirm_sesskey()) {
43 print_error('confirmsesskeybad', 'error');
44}
45
46if (! ($course = $DB->get_record('course', array('id'=>$id)))) {
47 print_error('invalidcourseid', 'error');
48}
49
50if (!$context = get_context_instance(CONTEXT_COURSE, $course->id)) {
51 print_error('nocontext');
52}
53
54// Remove any switched roles before checking login
55if ($switchrole == 0) {
56 role_switch($switchrole, $context);
57}
58require_login($course);
59
60// Switchrole - sanity check in cost-order...
61if ($switchrole > 0 && has_capability('moodle/role:switchroles', $context)) {
62 // is this role assignable in this context?
63 // inquiring minds want to know...
64 $aroles = get_switchable_roles($context);
65 if (is_array($aroles) && isset($aroles[$switchrole])) {
66 role_switch($switchrole, $context);
67 // Double check that this role is allowed here
68 require_login($course);
69 }
70}
71
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72// TODO: Using SESSION->returnurl is deprecated and should be removed in the future.
73// Till then this code remains to support any external applications calling this script.
74if (!empty($returnurl) && is_numeric($returnurl)) {
75 $returnurl = false;
76 if (!empty($SESSION->returnurl) && strpos($SESSION->returnurl, 'moodle_url')!==false) {
77 debugging('Code calling switchrole should be passing a URL as a param.', DEBUG_DEVELOPER);
78 $returnurl = @unserialize($SESSION->returnurl);
79 if (!($returnurl instanceof moodle_url)) {
80 $returnurl = false;
81 }
7d2a0492 82 }
7d2a0492 83}
84
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85if ($returnurl === false) {
86 $returnurl = new moodle_url('/course/view.php', array('id' => $course->id));
7d2a0492 87}
7d2a0492 88
e26507b3 89redirect($returnurl);