MDL-20534 lti: Updating privacy settings dynamically based on matched Launch URL.
[moodle.git] / mod / lti / locallib.php
CommitLineData
b9b2e7bb 1<?php
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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//
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17// This file is part of BasicLTI4Moodle
18//
19// BasicLTI4Moodle is an IMS BasicLTI (Basic Learning Tools for Interoperability)
20// consumer for Moodle 1.9 and Moodle 2.0. BasicLTI is a IMS Standard that allows web
21// based learning tools to be easily integrated in LMS as native ones. The IMS BasicLTI
22// specification is part of the IMS standard Common Cartridge 1.1 Sakai and other main LMS
23// are already supporting or going to support BasicLTI. This project Implements the consumer
24// for Moodle. Moodle is a Free Open source Learning Management System by Martin Dougiamas.
25// BasicLTI4Moodle is a project iniciated and leaded by Ludo(Marc Alier) and Jordi Piguillem
26// at the GESSI research group at UPC.
27// SimpleLTI consumer for Moodle is an implementation of the early specification of LTI
28// by Charles Severance (Dr Chuck) htp://dr-chuck.com , developed by Jordi Piguillem in a
29// Google Summer of Code 2008 project co-mentored by Charles Severance and Marc Alier.
30//
31// BasicLTI4Moodle is copyright 2009 by Marc Alier Forment, Jordi Piguillem and Nikolas Galanis
32// of the Universitat Politecnica de Catalunya http://www.upc.edu
33// Contact info: Marc Alier Forment granludo @ gmail.com or marc.alier @ upc.edu
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34
35/**
61eb12d4 36 * This file contains the library of functions and constants for the lti module
b9b2e7bb 37 *
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38 * @package mod
39 * @subpackage lti
40 * @copyright 2009 Marc Alier, Jordi Piguillem, Nikolas Galanis
b9b2e7bb 41 * marc.alier@upc.edu
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42 * @copyright 2009 Universitat Politecnica de Catalunya http://www.upc.edu
43 * @author Marc Alier
44 * @author Jordi Piguillem
45 * @author Nikolas Galanis
8f45215d 46 * @author Chris Scribner
61eb12d4 47 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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48 */
49
50defined('MOODLE_INTERNAL') || die;
51
fabd4fcf 52// TODO: Switch to core oauthlib once implemented - MDL-30149
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53use moodle\mod\lti as lti;
54
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55require_once($CFG->dirroot.'/mod/lti/OAuth.php');
56
57define('LTI_URL_DOMAIN_REGEX', '/(?:https?:\/\/)?(?:www\.)?([^\/]+)(?:\/|$)/i');
58
59define('LTI_LAUNCH_CONTAINER_DEFAULT', 1);
60define('LTI_LAUNCH_CONTAINER_EMBED', 2);
61define('LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS', 3);
62define('LTI_LAUNCH_CONTAINER_WINDOW', 4);
cca9d3f7 63define('LTI_LAUNCH_CONTAINER_REPLACE_MOODLE_WINDOW', 5);
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64
65define('LTI_TOOL_STATE_ANY', 0);
66define('LTI_TOOL_STATE_CONFIGURED', 1);
67define('LTI_TOOL_STATE_PENDING', 2);
68define('LTI_TOOL_STATE_REJECTED', 3);
69
70define('LTI_SETTING_NEVER', 0);
71define('LTI_SETTING_ALWAYS', 1);
5e078d62 72define('LTI_SETTING_DELEGATE', 2);
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73
74/**
75 * Prints a Basic LTI activity
76 *
77 * $param int $basicltiid Basic LTI activity id
78 */
67ddf847 79function lti_view($instance) {
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80 global $PAGE, $CFG;
81
ea04a9f9 82 if (empty($instance->typeid)) {
606ab1a1 83 $tool = lti_get_tool_by_url_match($instance->toolurl, $instance->course);
ea04a9f9 84 if ($tool) {
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85 $typeid = $tool->id;
86 } else {
87 $typeid = null;
88 }
89 } else {
90 $typeid = $instance->typeid;
91 }
e27cb316 92
ea04a9f9 93 if ($typeid) {
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94 $typeconfig = lti_get_type_config($typeid);
95 } else {
96 //There is no admin configuration for this tool. Use configuration in the lti instance record plus some defaults.
97 $typeconfig = (array)$instance;
e27cb316 98
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99 $typeconfig['sendname'] = $instance->instructorchoicesendname;
100 $typeconfig['sendemailaddr'] = $instance->instructorchoicesendemailaddr;
101 $typeconfig['customparameters'] = $instance->instructorcustomparameters;
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102 $typeconfig['acceptgrades'] = $instance->instructorchoiceacceptgrades;
103 $typeconfig['allowroster'] = $instance->instructorchoiceallowroster;
d8d04121 104 $typeconfig['forcessl'] = '0';
b9b2e7bb 105 }
e27cb316 106
b9b2e7bb 107 //Default the organizationid if not specified
ea04a9f9 108 if (empty($typeconfig['organizationid'])) {
b9b2e7bb 109 $urlparts = parse_url($CFG->wwwroot);
e27cb316 110
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111 $typeconfig['organizationid'] = $urlparts['host'];
112 }
e27cb316 113
ea04a9f9 114 if (!empty($instance->resourcekey)) {
3dd9ca24 115 $key = $instance->resourcekey;
ea04a9f9 116 } else if (!empty($typeconfig['resourcekey'])) {
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117 $key = $typeconfig['resourcekey'];
118 } else {
119 $key = '';
120 }
121
ea04a9f9 122 if (!empty($instance->password)) {
3dd9ca24 123 $secret = $instance->password;
ea04a9f9 124 } else if (!empty($typeconfig['password'])) {
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125 $secret = $typeconfig['password'];
126 } else {
127 $secret = '';
128 }
e27cb316 129
b9b2e7bb 130 $endpoint = !empty($instance->toolurl) ? $instance->toolurl : $typeconfig['toolurl'];
d8d04121 131 $endpoint = trim($endpoint);
e27cb316 132
d8d04121 133 //If the current request is using SSL and a secure tool URL is specified, use it
ea04a9f9 134 if (lti_request_is_using_ssl() && !empty($instance->securetoolurl)) {
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135 $endpoint = trim($instance->securetoolurl);
136 }
e27cb316 137
d8d04121 138 //If SSL is forced, use the secure tool url if specified. Otherwise, make sure https is on the normal launch URL.
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139 if ($typeconfig['forcessl'] == '1') {
140 if (!empty($instance->securetoolurl)) {
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141 $endpoint = trim($instance->securetoolurl);
142 }
e27cb316 143
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144 $endpoint = lti_ensure_url_is_https($endpoint);
145 } else {
ea04a9f9 146 if (!strstr($endpoint, '://')) {
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147 $endpoint = 'http://' . $endpoint;
148 }
f17f4959 149 }
e27cb316 150
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151 $orgid = $typeconfig['organizationid'];
152
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153 $course = $PAGE->course;
154 $requestparams = lti_build_request($instance, $typeconfig, $course);
155
3dd9ca24 156 $launchcontainer = lti_get_launch_container($instance, $typeconfig);
c4d80efe 157 $returnurlparams = array('course' => $course->id, 'launch_container' => $launchcontainer, 'instanceid' => $instance->id);
e27cb316 158
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159 if ( $orgid ) {
160 $requestparams["tool_consumer_instance_guid"] = $orgid;
161 }
e27cb316 162
ea04a9f9 163 if (empty($key) || empty($secret)) {
9d57ad17 164 $returnurlparams['unsigned'] = '1';
e27cb316 165
9d57ad17 166 //Add the return URL. We send the launch container along to help us avoid frames-within-frames when the user returns
c4d80efe 167 $url = new moodle_url('/mod/lti/return.php', $returnurlparams);
d8d04121 168 $returnurl = $url->out(false);
e27cb316 169
ea04a9f9 170 if ($typeconfig['forcessl'] == '1') {
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171 $returnurl = lti_ensure_url_is_https($returnurl);
172 }
e27cb316 173
d8d04121 174 $requestparams['launch_presentation_return_url'] = $returnurl;
9d57ad17 175 }
e27cb316 176
ea04a9f9 177 if (!empty($key) && !empty($secret)) {
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178 $parms = lti_sign_parameters($requestparams, $endpoint, "POST", $key, $secret);
179 } else {
180 //If no key and secret, do the launch unsigned.
181 $parms = $requestparams;
3dd9ca24 182 }
e27cb316 183
b9b2e7bb 184 $debuglaunch = ( $instance->debuglaunch == 1 );
e27cb316 185
dbb0fec9 186 $content = lti_post_launch_html($parms, $endpoint, $debuglaunch);
e27cb316 187
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188 echo $content;
189}
190
ea04a9f9 191function lti_build_sourcedid($instanceid, $userid, $launchid = null, $servicesalt) {
996b0fd9 192 $data = new stdClass();
e27cb316 193
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194 $data->instanceid = $instanceid;
195 $data->userid = $userid;
ea04a9f9 196 if (!empty($launchid)) {
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197 $data->launchid = $launchid;
198 } else {
199 $data->launchid = mt_rand();
200 }
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201
202 $json = json_encode($data);
203
204 $hash = hash('sha256', $json . $servicesalt, false);
205
206 $container = new stdClass();
207 $container->data = $data;
208 $container->hash = $hash;
209
210 return $container;
211}
212
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213/**
214 * This function builds the request that must be sent to the tool producer
215 *
216 * @param object $instance Basic LTI instance object
217 * @param object $typeconfig Basic LTI tool configuration
218 * @param object $course Course object
219 *
220 * @return array $request Request details
221 */
222function lti_build_request($instance, $typeconfig, $course) {
223 global $USER, $CFG;
224
ea04a9f9 225 if (empty($instance->cmid)) {
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226 $instance->cmid = 0;
227 }
e27cb316 228
1d4f052e 229 $role = lti_get_ims_role($USER, $instance->cmid, $instance->course);
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230
231 $locale = $course->lang;
232 if ( strlen($locale) < 1 ) {
233 $locale = $CFG->lang;
234 }
235
236 $requestparams = array(
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237 'resource_link_id' => $instance->id,
238 'resource_link_title' => $instance->name,
239 'resource_link_description' => $instance->intro,
240 'user_id' => $USER->id,
241 'roles' => $role,
242 'context_id' => $course->id,
243 'context_label' => $course->shortname,
244 'context_title' => $course->fullname,
245 'launch_presentation_locale' => $locale,
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246 );
247
b9b2e7bb 248 $placementsecret = $instance->servicesalt;
e27cb316 249
b9b2e7bb 250 if ( isset($placementsecret) ) {
f4f711d7 251 $sourcedid = json_encode(lti_build_sourcedid($instance->id, $USER->id, null, $placementsecret));
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252 }
253
254 if ( isset($placementsecret) &&
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255 ( $typeconfig['acceptgrades'] == LTI_SETTING_ALWAYS ||
256 ( $typeconfig['acceptgrades'] == LTI_SETTING_DELEGATE && $instance->instructorchoiceacceptgrades == LTI_SETTING_ALWAYS ) ) ) {
34eb0501 257 $requestparams['lis_result_sourcedid'] = $sourcedid;
e27cb316 258
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259 //Add outcome service URL
260 $serviceurl = new moodle_url('/mod/lti/service.php');
261 $serviceurl = $serviceurl->out();
feeb5294 262
ea04a9f9 263 if ($typeconfig['forcessl'] == '1') {
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264 $serviceurl = lti_ensure_url_is_https($serviceurl);
265 }
feeb5294 266
34eb0501 267 $requestparams['lis_outcome_service_url'] = $serviceurl;
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268 }
269
b9b2e7bb 270 // Send user's name and email data if appropriate
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271 if ( $typeconfig['sendname'] == LTI_SETTING_ALWAYS ||
272 ( $typeconfig['sendname'] == LTI_SETTING_DELEGATE && $instance->instructorchoicesendname == LTI_SETTING_ALWAYS ) ) {
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273 $requestparams['lis_person_name_given'] = $USER->firstname;
274 $requestparams['lis_person_name_family'] = $USER->lastname;
275 $requestparams['lis_person_name_full'] = $USER->firstname." ".$USER->lastname;
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276 }
277
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278 if ( $typeconfig['sendemailaddr'] == LTI_SETTING_ALWAYS ||
279 ( $typeconfig['sendemailaddr'] == LTI_SETTING_DELEGATE && $instance->instructorchoicesendemailaddr == LTI_SETTING_ALWAYS ) ) {
34eb0501 280 $requestparams['lis_person_contact_email_primary'] = $USER->email;
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281 }
282
283 // Concatenate the custom parameters from the administrator and the instructor
284 // Instructor parameters are only taken into consideration if the administrator
285 // has giver permission
286 $customstr = $typeconfig['customparameters'];
287 $instructorcustomstr = $instance->instructorcustomparameters;
288 $custom = array();
289 $instructorcustom = array();
290 if ($customstr) {
dbb0fec9 291 $custom = lti_split_custom_parameters($customstr);
b9b2e7bb 292 }
5e078d62 293 if (!isset($typeconfig['allowinstructorcustom']) || $typeconfig['allowinstructorcustom'] == LTI_SETTING_NEVER) {
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294 $requestparams = array_merge($custom, $requestparams);
295 } else {
296 if ($instructorcustomstr) {
dbb0fec9 297 $instructorcustom = lti_split_custom_parameters($instructorcustomstr);
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298 }
299 foreach ($instructorcustom as $key => $val) {
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300 // Ignore the instructor's parameter
301 if (!array_key_exists($key, $custom)) {
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302 $custom[$key] = $val;
303 }
304 }
305 $requestparams = array_merge($custom, $requestparams);
306 }
307
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308 // Make sure we let the tool know what LMS they are being called from
309 $requestparams["ext_lms"] = "moodle-2";
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310 $requestparams['tool_consumer_info_product_family_code'] = 'moodle';
311 $requestparams['tool_consumer_info_version'] = strval($CFG->version);
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312
313 // Add oauth_callback to be compliant with the 1.0A spec
34eb0501 314 $requestparams['oauth_callback'] = 'about:blank';
3dd9ca24 315
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316 //The submit button needs to be part of the signature as it gets posted with the form.
317 //This needs to be here to support launching without javascript.
3dd9ca24 318 $submittext = get_string('press_to_submit', 'lti');
34eb0501 319 $requestparams['ext_submit'] = $submittext;
e27cb316 320
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321 $requestparams['lti_version'] = 'LTI-1p0';
322 $requestparams['lti_message_type'] = 'basic-lti-launch-request';
e27cb316 323
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324 return $requestparams;
325}
326
ea04a9f9 327function lti_get_tool_table($tools, $id) {
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328 global $CFG, $USER;
329 $html = '';
e27cb316 330
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331 $typename = get_string('typename', 'lti');
332 $baseurl = get_string('baseurl', 'lti');
333 $action = get_string('action', 'lti');
334 $createdon = get_string('createdon', 'lti');
e27cb316 335
ea04a9f9 336 if ($id == 'lti_configured') {
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337 $html .= '<div><a style="margin-top:.25em" href="'.$CFG->wwwroot.'/mod/lti/typessettings.php?action=add&amp;sesskey='.$USER->sesskey.'">'.get_string('addtype', 'lti').'</a></div>';
338 }
e27cb316 339
795dff01 340 if (!empty($tools)) {
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341 $html .= "
342 <div id=\"{$id}_container\" style=\"margin-top:.5em;margin-bottom:.5em\">
343 <table id=\"{$id}_tools\">
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344 <thead>
345 <tr>
346 <th>$typename</th>
347 <th>$baseurl</th>
348 <th>$createdon</th>
349 <th>$action</th>
350 </tr>
351 </thead>
5de15b83 352 ";
e27cb316 353
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354 foreach ($tools as $type) {
355 $date = userdate($type->timecreated);
356 $accept = get_string('accept', 'lti');
357 $update = get_string('update', 'lti');
358 $delete = get_string('delete', 'lti');
e27cb316 359
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360 $accepthtml = "
361 <a class=\"editing_accept\" href=\"{$CFG->wwwroot}/mod/lti/typessettings.php?action=accept&amp;id={$type->id}&amp;sesskey={$USER->sesskey}&amp;tab={$id}\" title=\"{$accept}\">
362 <img class=\"iconsmall\" alt=\"{$accept}\" src=\"{$CFG->wwwroot}/pix/t/clear.gif\"/>
795dff01 363 </a>
5de15b83 364 ";
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365
366 $deleteaction = 'delete';
e27cb316 367
ea04a9f9 368 if ($type->state == LTI_TOOL_STATE_CONFIGURED) {
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369 $accepthtml = '';
370 }
e27cb316 371
ea04a9f9 372 if ($type->state != LTI_TOOL_STATE_REJECTED) {
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373 $deleteaction = 'reject';
374 $delete = get_string('reject', 'lti');
375 }
e27cb316 376
5de15b83 377 $html .= "
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378 <tr>
379 <td>
380 {$type->name}
381 </td>
382 <td>
383 {$type->baseurl}
384 </td>
385 <td>
386 {$date}
387 </td>
5de15b83 388 <td align=\"center\">
795dff01 389 {$accepthtml}
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390 <a class=\"editing_update\" href=\"{$CFG->wwwroot}/mod/lti/typessettings.php?action=update&amp;id={$type->id}&amp;sesskey={$USER->sesskey}&amp;tab={$id}\" title=\"{$update}\">
391 <img class=\"iconsmall\" alt=\"{$update}\" src=\"{$CFG->wwwroot}/pix/t/edit.gif\"/>
795dff01 392 </a>
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393 <a class=\"editing_delete\" href=\"{$CFG->wwwroot}/mod/lti/typessettings.php?action={$deleteaction}&amp;id={$type->id}&amp;sesskey={$USER->sesskey}&amp;tab={$id}\" title=\"{$delete}\">
394 <img class=\"iconsmall\" alt=\"{$delete}\" src=\"{$CFG->wwwroot}/pix/t/delete.gif\"/>
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395 </a>
396 </td>
397 </tr>
5de15b83 398 ";
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399 }
400 $html .= '</table></div>';
401 } else {
402 $html .= get_string('no_' . $id, 'lti');
403 }
e27cb316 404
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405 return $html;
406}
407
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408/**
409 * Splits the custom parameters field to the various parameters
410 *
411 * @param string $customstr String containing the parameters
412 *
413 * @return Array of custom parameters
414 */
dbb0fec9 415function lti_split_custom_parameters($customstr) {
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416 $textlib = textlib_get_instance();
417
418 $lines = preg_split("/[\n;]/", $customstr);
419 $retval = array();
420 foreach ($lines as $line) {
421 $pos = strpos($line, "=");
422 if ( $pos === false || $pos < 1 ) {
423 continue;
424 }
425 $key = trim($textlib->substr($line, 0, $pos));
461bde28 426 $val = trim($textlib->substr($line, $pos+1, strlen($line)));
dbb0fec9 427 $key = lti_map_keyname($key);
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428 $retval['custom_'.$key] = $val;
429 }
430 return $retval;
431}
432
433/**
434 * Used for building the names of the different custom parameters
435 *
436 * @param string $key Parameter name
437 *
438 * @return string Processed name
439 */
dbb0fec9 440function lti_map_keyname($key) {
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441 $textlib = textlib_get_instance();
442
443 $newkey = "";
444 $key = $textlib->strtolower(trim($key));
445 foreach (str_split($key) as $ch) {
446 if ( ($ch >= 'a' && $ch <= 'z') || ($ch >= '0' && $ch <= '9') ) {
447 $newkey .= $ch;
448 } else {
449 $newkey .= '_';
450 }
451 }
452 return $newkey;
453}
454
455/**
16cac566 456 * Gets the IMS role string for the specified user and LTI course module.
e27cb316 457 *
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458 * @param mixed $user User object or user id
459 * @param int $cmid The course module id of the LTI activity
460 * @return string A role string suitable for passing with an LTI launch
b9b2e7bb 461 */
1d4f052e 462function lti_get_ims_role($user, $cmid, $courseid) {
16cac566 463 $roles = array();
e27cb316 464
ea04a9f9 465 if (empty($cmid)) {
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466 //If no cmid is passed, check if the user is a teacher in the course
467 //This allows other modules to programmatically "fake" a launch without
468 //a real LTI instance
469 $coursecontext = get_context_instance(CONTEXT_COURSE, $courseid);
e27cb316 470
ea04a9f9 471 if (has_capability('moodle/course:manageactivities', $coursecontext)) {
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472 array_push($roles, 'Instructor');
473 } else {
474 array_push($roles, 'Learner');
475 }
16cac566 476 } else {
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477 $context = get_context_instance(CONTEXT_MODULE, $cmid);
478
ea04a9f9 479 if (has_capability('mod/lti:manage', $context)) {
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480 array_push($roles, 'Instructor');
481 } else {
482 array_push($roles, 'Learner');
483 }
b9b2e7bb 484 }
1d4f052e 485
ea04a9f9 486 if (is_siteadmin($user)) {
16cac566 487 array_push($roles, 'urn:lti:sysrole:ims/lis/Administrator');
b9b2e7bb 488 }
e27cb316 489
16cac566 490 return join(',', $roles);
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491}
492
493/**
494 * Returns configuration details for the tool
495 *
496 * @param int $typeid Basic LTI tool typeid
497 *
498 * @return array Tool Configuration
499 */
500function lti_get_type_config($typeid) {
501 global $DB;
502
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503 $query = "SELECT name, value
504 FROM {lti_types_config}
505 WHERE typeid = :typeid1
506 UNION ALL
507 SELECT 'toolurl' AS name, baseurl AS value
508 FROM {lti_types}
509 WHERE id = :typeid2";
e27cb316 510
b9b2e7bb 511 $typeconfig = array();
f17f4959 512 $configs = $DB->get_records_sql($query, array('typeid1' => $typeid, 'typeid2' => $typeid));
e27cb316 513
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514 if (!empty($configs)) {
515 foreach ($configs as $config) {
516 $typeconfig[$config->name] = $config->value;
517 }
518 }
e27cb316 519
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520 return $typeconfig;
521}
522
ea04a9f9 523function lti_get_tools_by_url($url, $state, $courseid = null) {
b9b2e7bb 524 $domain = lti_get_domain_from_url($url);
e27cb316 525
996b0fd9 526 return lti_get_tools_by_domain($domain, $state, $courseid);
b9b2e7bb
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527}
528
ea04a9f9 529function lti_get_tools_by_domain($domain, $state = null, $courseid = null) {
b9b2e7bb 530 global $DB, $SITE;
e27cb316 531
b9b2e7bb 532 $filters = array('tooldomain' => $domain);
e27cb316 533
b9b2e7bb
CS
534 $statefilter = '';
535 $coursefilter = '';
e27cb316 536
ea04a9f9 537 if ($state) {
b9b2e7bb
CS
538 $statefilter = 'AND state = :state';
539 }
e27cb316 540
ea04a9f9 541 if ($courseid && $courseid != $SITE->id) {
b9b2e7bb
CS
542 $coursefilter = 'OR course = :courseid';
543 }
e27cb316 544
5f136255
EL
545 $query = "SELECT *
546 FROM {lti_types}
547 WHERE tooldomain = :tooldomain
548 AND (course = :siteid $coursefilter)
549 $statefilter";
e27cb316 550
b9b2e7bb 551 return $DB->get_records_sql($query, array(
e27cb316
CS
552 'courseid' => $courseid,
553 'siteid' => $SITE->id,
554 'tooldomain' => $domain,
b9b2e7bb
CS
555 'state' => $state
556 ));
557}
558
559/**
560 * Returns all basicLTI tools configured by the administrator
561 *
562 */
6831c7cd 563function lti_filter_get_types($course) {
b9b2e7bb
CS
564 global $DB;
565
ea04a9f9 566 if (!empty($course)) {
6831c7cd
CS
567 $filter = array('course' => $course);
568 } else {
569 $filter = array();
570 }
e27cb316 571
6831c7cd 572 return $DB->get_records('lti_types', $filter);
b9b2e7bb
CS
573}
574
ea04a9f9 575function lti_get_types_for_add_instance() {
996b0fd9 576 global $DB, $SITE, $COURSE;
e27cb316 577
5f136255
EL
578 $query = "SELECT *
579 FROM {lti_types}
580 WHERE coursevisible = 1
581 AND (course = :siteid OR course = :courseid)
582 AND state = :active";
e27cb316 583
606ab1a1 584 $admintypes = $DB->get_records_sql($query, array('siteid' => $SITE->id, 'courseid' => $COURSE->id, 'active' => LTI_TOOL_STATE_CONFIGURED));
e27cb316 585
b9b2e7bb 586 $types = array();
996b0fd9 587 $types[0] = (object)array('name' => get_string('automatic', 'lti'), 'course' => $SITE->id);
e27cb316 588
ea04a9f9 589 foreach ($admintypes as $type) {
16e8f130 590 $types[$type->id] = $type;
b9b2e7bb 591 }
e27cb316 592
b9b2e7bb
CS
593 return $types;
594}
595
ea04a9f9 596function lti_get_domain_from_url($url) {
b9b2e7bb 597 $matches = array();
e27cb316 598
ea04a9f9 599 if (preg_match(LTI_URL_DOMAIN_REGEX, $url, $matches)) {
b9b2e7bb
CS
600 return $matches[1];
601 }
602}
603
ea04a9f9 604function lti_get_tool_by_url_match($url, $courseid = null, $state = LTI_TOOL_STATE_CONFIGURED) {
b69dc429 605 $possibletools = lti_get_tools_by_url($url, $state, $courseid);
e27cb316 606
7023b65e 607 return lti_get_best_tool_by_url($url, $possibletools, $courseid);
b9b2e7bb
CS
608}
609
ea04a9f9 610function lti_get_url_thumbprint($url) {
b9b2e7bb 611 $urlparts = parse_url(strtolower($url));
ea04a9f9 612 if (!isset($urlparts['path'])) {
b9b2e7bb
CS
613 $urlparts['path'] = '';
614 }
e27cb316 615
ea04a9f9 616 if (!isset($urlparts['host'])) {
d8d04121
CS
617 $urlparts['host'] = '';
618 }
e27cb316 619
ea04a9f9 620 if (substr($urlparts['host'], 0, 4) === 'www.') {
d8d04121 621 $urlparts['host'] = substr($urlparts['host'], 4);
b9b2e7bb 622 }
e27cb316 623
b9b2e7bb
CS
624 return $urllower = $urlparts['host'] . '/' . $urlparts['path'];
625}
626
ea04a9f9
EL
627function lti_get_best_tool_by_url($url, $tools, $courseid = null) {
628 if (count($tools) === 0) {
b9b2e7bb
CS
629 return null;
630 }
e27cb316 631
b9b2e7bb 632 $urllower = lti_get_url_thumbprint($url);
e27cb316 633
ea04a9f9 634 foreach ($tools as $tool) {
b9b2e7bb 635 $tool->_matchscore = 0;
e27cb316 636
b9b2e7bb 637 $toolbaseurllower = lti_get_url_thumbprint($tool->baseurl);
e27cb316 638
ea04a9f9 639 if ($urllower === $toolbaseurllower) {
7023b65e 640 //100 points for exact thumbprint match
b9b2e7bb 641 $tool->_matchscore += 100;
ea04a9f9 642 } else if (substr($urllower, 0, strlen($toolbaseurllower)) === $toolbaseurllower) {
7023b65e 643 //50 points if tool thumbprint starts with the base URL thumbprint
b9b2e7bb
CS
644 $tool->_matchscore += 50;
645 }
e27cb316 646
7023b65e 647 //Prefer course tools over site tools
ea04a9f9 648 if (!empty($courseid)) {
4c598b13 649 //Minus 10 points for not matching the course id (global tools)
ea04a9f9 650 if ($tool->course != $courseid) {
7023b65e
CS
651 $tool->_matchscore -= 10;
652 }
653 }
b9b2e7bb 654 }
e27cb316 655
ea04a9f9
EL
656 $bestmatch = array_reduce($tools, function($value, $tool) {
657 if ($tool->_matchscore > $value->_matchscore) {
b9b2e7bb
CS
658 return $tool;
659 } else {
660 return $value;
661 }
e27cb316 662
b9b2e7bb 663 }, (object)array('_matchscore' => -1));
e27cb316 664
b9b2e7bb 665 //None of the tools are suitable for this URL
ea04a9f9 666 if ($bestmatch->_matchscore <= 0) {
b9b2e7bb
CS
667 return null;
668 }
e27cb316 669
b9b2e7bb
CS
670 return $bestmatch;
671}
672
ea04a9f9 673function lti_get_shared_secrets_by_key($key) {
020eea1b 674 global $DB;
e27cb316 675
020eea1b
CS
676 //Look up the shared secret for the specified key in both the types_config table (for configured tools)
677 //And in the lti resource table for ad-hoc tools
5f136255
EL
678 $query = "SELECT t2.value
679 FROM {lti_types_config} t1
680 JOIN {lti_types_config} t2 ON t1.typeid = t2.typeid
681 JOIN {lti_types} type ON t2.typeid = type.id
682 WHERE t1.name = 'resourcekey'
683 AND t1.value = :key1
684 AND t2.name = 'password'
685 AND type.state = :configured
686 UNION
687 SELECT password AS value
688 FROM {lti}
689 WHERE resourcekey = :key2";
e27cb316 690
feb30fd8 691 $sharedsecrets = $DB->get_records_sql($query, array('configured' => LTI_TOOL_STATE_CONFIGURED, 'key1' => $key, 'key2' => $key));
e27cb316 692
ea04a9f9 693 $values = array_map(function($item) {
020eea1b
CS
694 return $item->value;
695 }, $sharedsecrets);
e27cb316 696
020eea1b
CS
697 //There should really only be one shared secret per key. But, we can't prevent
698 //more than one getting entered. For instance, if the same key is used for two tool providers.
699 return $values;
700}
701
b9b2e7bb
CS
702/**
703 * Delete a Basic LTI configuration
704 *
705 * @param int $id Configuration id
706 */
707function lti_delete_type($id) {
708 global $DB;
709
710 //We should probably just copy the launch URL to the tool instances in this case... using a single query
711 /*
712 $instances = $DB->get_records('lti', array('typeid' => $id));
713 foreach ($instances as $instance) {
714 $instance->typeid = 0;
715 $DB->update_record('lti', $instance);
716 }*/
717
718 $DB->delete_records('lti_types', array('id' => $id));
719 $DB->delete_records('lti_types_config', array('typeid' => $id));
720}
721
ea04a9f9 722function lti_set_state_for_type($id, $state) {
b9b2e7bb 723 global $DB;
e27cb316 724
b9b2e7bb
CS
725 $DB->update_record('lti_types', array('id' => $id, 'state' => $state));
726}
727
728/**
729 * Transforms a basic LTI object to an array
730 *
731 * @param object $ltiobject Basic LTI object
732 *
733 * @return array Basic LTI configuration details
734 */
735function lti_get_config($ltiobject) {
736 $typeconfig = array();
737 $typeconfig = (array)$ltiobject;
738 $additionalconfig = lti_get_type_config($ltiobject->typeid);
739 $typeconfig = array_merge($typeconfig, $additionalconfig);
740 return $typeconfig;
741}
742
743/**
744 *
745 * Generates some of the tool configuration based on the instance details
746 *
747 * @param int $id
748 *
749 * @return Instance configuration
750 *
751 */
752function lti_get_type_config_from_instance($id) {
753 global $DB;
754
755 $instance = $DB->get_record('lti', array('id' => $id));
756 $config = lti_get_config($instance);
757
758 $type = new stdClass();
759 $type->lti_fix = $id;
760 if (isset($config['toolurl'])) {
761 $type->lti_toolurl = $config['toolurl'];
762 }
763 if (isset($config['instructorchoicesendname'])) {
764 $type->lti_sendname = $config['instructorchoicesendname'];
765 }
766 if (isset($config['instructorchoicesendemailaddr'])) {
767 $type->lti_sendemailaddr = $config['instructorchoicesendemailaddr'];
768 }
769 if (isset($config['instructorchoiceacceptgrades'])) {
770 $type->lti_acceptgrades = $config['instructorchoiceacceptgrades'];
771 }
772 if (isset($config['instructorchoiceallowroster'])) {
773 $type->lti_allowroster = $config['instructorchoiceallowroster'];
774 }
775
776 if (isset($config['instructorcustomparameters'])) {
777 $type->lti_allowsetting = $config['instructorcustomparameters'];
778 }
779 return $type;
780}
781
782/**
783 * Generates some of the tool configuration based on the admin configuration details
784 *
785 * @param int $id
786 *
787 * @return Configuration details
788 */
789function lti_get_type_type_config($id) {
790 global $DB;
791
792 $basicltitype = $DB->get_record('lti_types', array('id' => $id));
793 $config = lti_get_type_config($id);
794
036e84c3 795 $type = new stdClass();
5f72d102 796
b9b2e7bb 797 $type->lti_typename = $basicltitype->name;
e27cb316 798
6831c7cd 799 $type->typeid = $basicltitype->id;
e27cb316 800
b9b2e7bb 801 $type->lti_toolurl = $basicltitype->baseurl;
e27cb316 802
b9b2e7bb
CS
803 if (isset($config['resourcekey'])) {
804 $type->lti_resourcekey = $config['resourcekey'];
805 }
806 if (isset($config['password'])) {
807 $type->lti_password = $config['password'];
808 }
809
810 if (isset($config['sendname'])) {
811 $type->lti_sendname = $config['sendname'];
812 }
ea04a9f9 813 if (isset($config['instructorchoicesendname'])) {
b9b2e7bb
CS
814 $type->lti_instructorchoicesendname = $config['instructorchoicesendname'];
815 }
ea04a9f9 816 if (isset($config['sendemailaddr'])) {
b9b2e7bb
CS
817 $type->lti_sendemailaddr = $config['sendemailaddr'];
818 }
ea04a9f9 819 if (isset($config['instructorchoicesendemailaddr'])) {
b9b2e7bb
CS
820 $type->lti_instructorchoicesendemailaddr = $config['instructorchoicesendemailaddr'];
821 }
ea04a9f9 822 if (isset($config['acceptgrades'])) {
b9b2e7bb
CS
823 $type->lti_acceptgrades = $config['acceptgrades'];
824 }
ea04a9f9 825 if (isset($config['instructorchoiceacceptgrades'])) {
b9b2e7bb
CS
826 $type->lti_instructorchoiceacceptgrades = $config['instructorchoiceacceptgrades'];
827 }
ea04a9f9 828 if (isset($config['allowroster'])) {
b9b2e7bb
CS
829 $type->lti_allowroster = $config['allowroster'];
830 }
ea04a9f9 831 if (isset($config['instructorchoiceallowroster'])) {
b9b2e7bb
CS
832 $type->lti_instructorchoiceallowroster = $config['instructorchoiceallowroster'];
833 }
834
835 if (isset($config['customparameters'])) {
836 $type->lti_customparameters = $config['customparameters'];
837 }
838
ea04a9f9 839 if (isset($config['forcessl'])) {
d8d04121
CS
840 $type->lti_forcessl = $config['forcessl'];
841 }
e27cb316 842
b9b2e7bb
CS
843 if (isset($config['organizationid'])) {
844 $type->lti_organizationid = $config['organizationid'];
845 }
846 if (isset($config['organizationurl'])) {
847 $type->lti_organizationurl = $config['organizationurl'];
848 }
849 if (isset($config['organizationdescr'])) {
850 $type->lti_organizationdescr = $config['organizationdescr'];
851 }
852 if (isset($config['launchcontainer'])) {
853 $type->lti_launchcontainer = $config['launchcontainer'];
854 }
e27cb316 855
b9b2e7bb
CS
856 if (isset($config['coursevisible'])) {
857 $type->lti_coursevisible = $config['coursevisible'];
858 }
e27cb316 859
b9b2e7bb
CS
860 if (isset($config['debuglaunch'])) {
861 $type->lti_debuglaunch = $config['debuglaunch'];
862 }
e27cb316 863
b9b2e7bb 864 if (isset($config['module_class_type'])) {
036e84c3 865 $type->lti_module_class_type = $config['module_class_type'];
b9b2e7bb
CS
866 }
867
868 return $type;
869}
870
ea04a9f9 871function lti_prepare_type_for_save($type, $config) {
b9b2e7bb
CS
872 $type->baseurl = $config->lti_toolurl;
873 $type->tooldomain = lti_get_domain_from_url($config->lti_toolurl);
874 $type->name = $config->lti_typename;
e27cb316 875
b9b2e7bb
CS
876 $type->coursevisible = !empty($config->lti_coursevisible) ? $config->lti_coursevisible : 0;
877 $config->lti_coursevisible = $type->coursevisible;
e27cb316 878
d8d04121
CS
879 $type->forcessl = !empty($config->lti_forcessl) ? $config->lti_forcessl : 0;
880 $config->lti_forcessl = $type->forcessl;
e27cb316 881
b9b2e7bb 882 $type->timemodified = time();
e27cb316 883
b9b2e7bb
CS
884 unset ($config->lti_typename);
885 unset ($config->lti_toolurl);
886}
887
ea04a9f9 888function lti_update_type($type, $config) {
b9b2e7bb 889 global $DB;
e27cb316 890
b9b2e7bb 891 lti_prepare_type_for_save($type, $config);
e27cb316 892
b9b2e7bb
CS
893 if ($DB->update_record('lti_types', $type)) {
894 foreach ($config as $key => $value) {
895 if (substr($key, 0, 4)=='lti_' && !is_null($value)) {
896 $record = new StdClass();
897 $record->typeid = $type->id;
898 $record->name = substr($key, 4);
899 $record->value = $value;
e27cb316 900
b9b2e7bb
CS
901 lti_update_config($record);
902 }
903 }
904 }
905}
906
ea04a9f9 907function lti_add_type($type, $config) {
b9b2e7bb 908 global $USER, $SITE, $DB;
e27cb316 909
b9b2e7bb 910 lti_prepare_type_for_save($type, $config);
e27cb316 911
ea04a9f9 912 if (!isset($type->state)) {
b9b2e7bb
CS
913 $type->state = LTI_TOOL_STATE_PENDING;
914 }
e27cb316 915
ea04a9f9 916 if (!isset($type->timecreated)) {
b9b2e7bb
CS
917 $type->timecreated = time();
918 }
e27cb316 919
ea04a9f9 920 if (!isset($type->createdby)) {
b9b2e7bb
CS
921 $type->createdby = $USER->id;
922 }
e27cb316 923
ea04a9f9 924 if (!isset($type->course)) {
b9b2e7bb
CS
925 $type->course = $SITE->id;
926 }
e27cb316 927
b9b2e7bb 928 //Create a salt value to be used for signing passed data to extension services
6831c7cd
CS
929 //The outcome service uses the service salt on the instance. This can be used
930 //for communication with services not related to a specific LTI instance.
b9b2e7bb
CS
931 $config->lti_servicesalt = uniqid('', true);
932
933 $id = $DB->insert_record('lti_types', $type);
934
935 if ($id) {
936 foreach ($config as $key => $value) {
937 if (substr($key, 0, 4)=='lti_' && !is_null($value)) {
938 $record = new StdClass();
939 $record->typeid = $id;
940 $record->name = substr($key, 4);
941 $record->value = $value;
942
943 lti_add_config($record);
944 }
945 }
946 }
e27cb316 947
996b0fd9 948 return $id;
b9b2e7bb
CS
949}
950
951/**
952 * Add a tool configuration in the database
953 *
954 * @param $config Tool configuration
955 *
956 * @return int Record id number
957 */
958function lti_add_config($config) {
959 global $DB;
960
961 return $DB->insert_record('lti_types_config', $config);
962}
963
964/**
965 * Updates a tool configuration in the database
966 *
967 * @param $config Tool configuration
968 *
969 * @return Record id number
970 */
971function lti_update_config($config) {
972 global $DB;
973
974 $return = true;
975 $old = $DB->get_record('lti_types_config', array('typeid' => $config->typeid, 'name' => $config->name));
e27cb316 976
b9b2e7bb
CS
977 if ($old) {
978 $config->id = $old->id;
979 $return = $DB->update_record('lti_types_config', $config);
980 } else {
981 $return = $DB->insert_record('lti_types_config', $config);
982 }
983 return $return;
984}
985
986/**
987 * Signs the petition to launch the external tool using OAuth
988 *
989 * @param $oldparms Parameters to be passed for signing
990 * @param $endpoint url of the external tool
991 * @param $method Method for sending the parameters (e.g. POST)
992 * @param $oauth_consumoer_key Key
993 * @param $oauth_consumoer_secret Secret
994 * @param $submittext The text for the submit button
995 * @param $orgid LMS name
996 * @param $orgdesc LMS key
997 */
3dd9ca24
CS
998function lti_sign_parameters($oldparms, $endpoint, $method, $oauthconsumerkey, $oauthconsumersecret) {
999 //global $lastbasestring;
b9b2e7bb 1000 $parms = $oldparms;
b9b2e7bb
CS
1001
1002 $testtoken = '';
e27cb316 1003
fabd4fcf 1004 // TODO: Switch to core oauthlib once implemented - MDL-30149
795dff01
CS
1005 $hmacmethod = new lti\OAuthSignatureMethod_HMAC_SHA1();
1006 $testconsumer = new lti\OAuthConsumer($oauthconsumerkey, $oauthconsumersecret, null);
795dff01 1007 $accreq = lti\OAuthRequest::from_consumer_and_token($testconsumer, $testtoken, $method, $endpoint, $parms);
b9b2e7bb
CS
1008 $accreq->sign_request($hmacmethod, $testconsumer, $testtoken);
1009
1010 // Pass this back up "out of band" for debugging
3dd9ca24 1011 //$lastbasestring = $accreq->get_signature_base_string();
b9b2e7bb
CS
1012
1013 $newparms = $accreq->get_parameters();
1014
1015 return $newparms;
1016}
1017
1018/**
1019 * Posts the launch petition HTML
1020 *
1021 * @param $newparms Signed parameters
1022 * @param $endpoint URL of the external tool
1023 * @param $debug Debug (true/false)
1024 */
dbb0fec9 1025function lti_post_launch_html($newparms, $endpoint, $debug=false) {
b9b2e7bb 1026 $r = "<form action=\"".$endpoint."\" name=\"ltiLaunchForm\" id=\"ltiLaunchForm\" method=\"post\" encType=\"application/x-www-form-urlencoded\">\n";
e27cb316 1027
b9b2e7bb
CS
1028 $submittext = $newparms['ext_submit'];
1029
1030 // Contruct html for the launch parameters
1031 foreach ($newparms as $key => $value) {
1032 $key = htmlspecialchars($key);
1033 $value = htmlspecialchars($value);
1034 if ( $key == "ext_submit" ) {
1035 $r .= "<input type=\"submit\" name=\"";
1036 } else {
1037 $r .= "<input type=\"hidden\" name=\"";
1038 }
1039 $r .= $key;
1040 $r .= "\" value=\"";
1041 $r .= $value;
1042 $r .= "\"/>\n";
1043 }
1044
1045 if ( $debug ) {
1046 $r .= "<script language=\"javascript\"> \n";
1047 $r .= " //<![CDATA[ \n";
1048 $r .= "function basicltiDebugToggle() {\n";
1049 $r .= " var ele = document.getElementById(\"basicltiDebug\");\n";
ea04a9f9 1050 $r .= " if (ele.style.display == \"block\") {\n";
b9b2e7bb
CS
1051 $r .= " ele.style.display = \"none\";\n";
1052 $r .= " }\n";
1053 $r .= " else {\n";
1054 $r .= " ele.style.display = \"block\";\n";
1055 $r .= " }\n";
1056 $r .= "} \n";
1057 $r .= " //]]> \n";
1058 $r .= "</script>\n";
1059 $r .= "<a id=\"displayText\" href=\"javascript:basicltiDebugToggle();\">";
1060 $r .= get_string("toggle_debug_data", "lti")."</a>\n";
1061 $r .= "<div id=\"basicltiDebug\" style=\"display:none\">\n";
1062 $r .= "<b>".get_string("basiclti_endpoint", "lti")."</b><br/>\n";
1063 $r .= $endpoint . "<br/>\n&nbsp;<br/>\n";
1064 $r .= "<b>".get_string("basiclti_parameters", "lti")."</b><br/>\n";
1065 foreach ($newparms as $key => $value) {
1066 $key = htmlspecialchars($key);
1067 $value = htmlspecialchars($value);
1068 $r .= "$key = $value<br/>\n";
1069 }
1070 $r .= "&nbsp;<br/>\n";
3dd9ca24 1071 //$r .= "<p><b>".get_string("basiclti_base_string", "lti")."</b><br/>\n".$lastbasestring."</p>\n";
b9b2e7bb
CS
1072 $r .= "</div>\n";
1073 }
1074 $r .= "</form>\n";
1075
1076 if ( ! $debug ) {
1077 $ext_submit = "ext_submit";
1078 $ext_submit_text = $submittext;
1079 $r .= " <script type=\"text/javascript\"> \n" .
1080 " //<![CDATA[ \n" .
1081 " document.getElementById(\"ltiLaunchForm\").style.display = \"none\";\n" .
1082 " nei = document.createElement('input');\n" .
1083 " nei.setAttribute('type', 'hidden');\n" .
1084 " nei.setAttribute('name', '".$ext_submit."');\n" .
1085 " nei.setAttribute('value', '".$ext_submit_text."');\n" .
1086 " document.getElementById(\"ltiLaunchForm\").appendChild(nei);\n" .
1087 " document.ltiLaunchForm.submit(); \n" .
1088 " //]]> \n" .
1089 " </script> \n";
1090 }
1091 return $r;
1092}
1093
ea04a9f9 1094function lti_get_type($typeid) {
996b0fd9 1095 global $DB;
e27cb316 1096
996b0fd9 1097 return $DB->get_record('lti_types', array('id' => $typeid));
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1098}
1099
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1100function lti_get_launch_container($lti, $toolconfig) {
1101 if (empty($lti->launchcontainer)) {
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1102 $lti->launchcontainer = LTI_LAUNCH_CONTAINER_DEFAULT;
1103 }
1104
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1105 if ($lti->launchcontainer == LTI_LAUNCH_CONTAINER_DEFAULT) {
1106 if (isset($toolconfig['launchcontainer'])) {
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1107 $launchcontainer = $toolconfig['launchcontainer'];
1108 }
1109 } else {
1110 $launchcontainer = $lti->launchcontainer;
1111 }
e27cb316 1112
ea04a9f9 1113 if (empty($launchcontainer) || $launchcontainer == LTI_LAUNCH_CONTAINER_DEFAULT) {
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1114 $launchcontainer = LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS;
1115 }
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1116
1117 $devicetype = get_device_type();
1118
1119 //Scrolling within the object element doesn't work on iOS or Android
1120 //Opening the popup window also had some issues in testing
1121 //For mobile devices, always take up the entire screen to ensure the best experience
ea04a9f9 1122 if ($devicetype === 'mobile' || $devicetype === 'tablet' ) {
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1123 $launchcontainer = LTI_LAUNCH_CONTAINER_REPLACE_MOODLE_WINDOW;
1124 }
e27cb316 1125
57d1dffd 1126 return $launchcontainer;
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1127}
1128
1129function lti_request_is_using_ssl() {
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1130 global $FULLME;
1131 return (stripos($FULLME, 'https://') === 0);
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1132}
1133
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1134function lti_ensure_url_is_https($url) {
1135 if (!strstr($url, '://')) {
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1136 $url = 'https://' . $url;
1137 } else {
1138 //If the URL starts with http, replace with https
ea04a9f9 1139 if (stripos($url, 'http://') === 0) {
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1140 $url = 'https://' . substr($url, 8);
1141 }
1142 }
e27cb316 1143
d8d04121 1144 return $url;
61eb12d4 1145}