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 * Handle the return back to Moodle from the tool provider
19 *
20 * @package mod_lti
21 * @copyright  Copyright (c) 2011 Moodlerooms Inc. (http://www.moodlerooms.com)
22 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
23 * @author     Chris Scribner
24 */
25
26require_once('../../config.php');
27require_once($CFG->dirroot.'/mod/lti/lib.php');
28require_once($CFG->dirroot.'/mod/lti/locallib.php');
29
30$courseid = required_param('course', PARAM_INT);
31$instanceid = optional_param('instanceid', 0, PARAM_INT);
32
33$errormsg = optional_param('lti_errormsg', '', PARAM_TEXT);
34$msg = optional_param('lti_msg', '', PARAM_TEXT);
35$unsigned = optional_param('unsigned', '0', PARAM_INT);
36
37$launchcontainer = optional_param('launch_container', LTI_LAUNCH_CONTAINER_WINDOW, PARAM_INT);
38
39$course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
40$lti = null;
41$context = null;
42if (!empty($instanceid)) {
43    $lti = $DB->get_record('lti', array('id' => $instanceid), '*', MUST_EXIST);
44    $cm = get_coursemodule_from_instance('lti', $lti->id, $lti->course, false, MUST_EXIST);
45    $context = context_module::instance($cm->id);
46}
47
48
49require_login($course);
50require_sesskey();
51
52if (!empty($errormsg) || !empty($msg)) {
53    $url = new moodle_url('/mod/lti/return.php', array('course' => $courseid));
54    $PAGE->set_url($url);
55
56    $pagetitle = strip_tags($course->shortname);
57    $PAGE->set_title($pagetitle);
58    $PAGE->set_heading($course->fullname);
59
60    // Avoid frame-in-frame action.
61    if ($launchcontainer == LTI_LAUNCH_CONTAINER_EMBED || $launchcontainer == LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS) {
62        $PAGE->set_pagelayout('embedded');
63    } else {
64        $PAGE->set_pagelayout('incourse');
65    }
66
67    echo $OUTPUT->header();
68    if (!empty($lti) and !empty($context)) {
69        echo $OUTPUT->heading(format_string($lti->name, true, array('context' => $context)));
70    }
71}
72
73if (!empty($errormsg)) {
74    echo get_string('lti_launch_error', 'lti');
75
76    p($errormsg);
77
78    if ($unsigned == 1) {
79
80        $contextcourse = context_course::instance($courseid);
81        echo '<br /><br />';
82        $links = new stdClass();
83
84        if (has_capability('mod/lti:addcoursetool', $contextcourse)) {
85            $coursetooleditor = new moodle_url('/mod/lti/instructor_edit_tool_type.php',
86                array('course' => $courseid, 'action' => 'add', 'sesskey' => sesskey()));
87            $links->course_tool_editor = $coursetooleditor->out(false);
88
89            echo get_string('lti_launch_error_unsigned_help', 'lti', $links);
90        }
91
92        if (!empty($lti) && has_capability('mod/lti:requesttooladd', $contextcourse)) {
93            $adminrequesturl = new moodle_url('/mod/lti/request_tool.php', array('instanceid' => $lti->id, 'sesskey' => sesskey()));
94            $links->admin_request_url = $adminrequesturl->out(false);
95
96            echo get_string('lti_launch_error_tool_request', 'lti', $links);
97        }
98    }
99
100    echo $OUTPUT->footer();
101} else if (!empty($msg)) {
102
103    p($msg);
104
105    echo $OUTPUT->footer();
106
107} else {
108    $courseurl = new moodle_url('/course/view.php', array('id' => $courseid));
109    $url = $courseurl->out();
110
111    // Avoid frame-in-frame action.
112    if ($launchcontainer == LTI_LAUNCH_CONTAINER_EMBED || $launchcontainer == LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS) {
113        // Output a page containing some script to break out of frames and redirect them.
114
115        echo '<html><body>';
116
117        $script = "
118            <script type=\"text/javascript\">
119            //<![CDATA[
120                if(window != top){
121                    top.location.href = '{$url}';
122                } else {
123                    window.location.href = '{$url}';
124                }
125            //]]
126            </script>
127        ";
128
129        $clickhere = get_string('return_to_course', 'lti', (object)array('link' => $url));
130
131        $noscript = "
132            <noscript>
133                {$clickhere}
134            </noscript>
135        ";
136
137        echo $script;
138        echo $noscript;
139
140        echo '</body></html>';
141    } else {
142        // If no error, take them back to the course.
143        redirect($url);
144    }
145}
146