2 // This file is part of Moodle - http://moodle.org/
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.
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.
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/>.
17 // This file is part of BasicLTI4Moodle
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.
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
36 * This file contains a library of functions and constants for the lti module
40 * @copyright 2009 Marc Alier, Jordi Piguillem, Nikolas Galanis
42 * @copyright 2009 Universitat Politecnica de Catalunya http://www.upc.edu
44 * @author Jordi Piguillem
45 * @author Nikolas Galanis
46 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
49 defined('MOODLE_INTERNAL') || die;
51 require_once($CFG->dirroot.'/mod/lti/locallib.php');
54 * List of features supported in URL module
55 * @param string $feature FEATURE_xx constant for requested feature
56 * @return mixed True if module supports feature, false if not, null if doesn't know
58 function lti_supports($feature) {
60 case FEATURE_GROUPS: return false;
61 case FEATURE_GROUPINGS: return false;
62 case FEATURE_GROUPMEMBERSONLY: return true;
63 case FEATURE_MOD_INTRO: return true;
64 case FEATURE_COMPLETION_TRACKS_VIEWS: return true;
65 case FEATURE_GRADE_HAS_GRADE: return true;
66 case FEATURE_GRADE_OUTCOMES: return true;
67 case FEATURE_BACKUP_MOODLE2: return true;
74 * Given an object containing all the necessary data,
75 * (defined by the form in mod.html) this function
76 * will create a new instance and return the id number
77 * of the new instance.
79 * @param object $instance An object from the form in mod.html
80 * @return int The id of the newly inserted basiclti record
82 function lti_add_instance($formdata) {
84 $formdata->timecreated = time();
85 $formdata->timemodified = $formdata->timecreated;
86 $formdata->servicesalt = uniqid('', true);
88 if (!isset($formdata->grade)) {
89 $formdata->grade = 100;
92 $id = $DB->insert_record("lti", $formdata);
94 if ($formdata->instructorchoiceacceptgrades == LTI_SETTING_ALWAYS) {
95 $basiclti = $DB->get_record('lti', array('id'=>$id));
97 if (!isset($formdata->cmidnumber)) {
98 $formdata->cmidnumber = '';
101 $basiclti->cmidnumber = $formdata->cmidnumber;
103 lti_grade_item_update($basiclti);
110 * Given an object containing all the necessary data,
111 * (defined by the form in mod.html) this function
112 * will update an existing instance with new data.
114 * @param object $instance An object from the form in mod.html
115 * @return boolean Success/Fail
117 function lti_update_instance($formdata) {
120 $formdata->timemodified = time();
121 $formdata->id = $formdata->instance;
123 if (!isset($formdata->showtitle)) {
124 $formdata->showtitle = 0;
127 if (!isset($formdata->showdescription)) {
128 $formdata->showdescription = 0;
131 if ($formdata->instructorchoiceacceptgrades == LTI_SETTING_ALWAYS) {
132 $basicltirec = $DB->get_record("lti", array("id" => $formdata->id));
133 $basicltirec->cmidnumber = $formdata->cmidnumber;
135 lti_grade_item_update($basicltirec);
137 lti_grade_item_delete($formdata);
140 return $DB->update_record("lti", $formdata);
144 * Given an ID of an instance of this module,
145 * this function will permanently delete the instance
146 * and any data that depends on it.
148 * @param int $id Id of the module instance
149 * @return boolean Success/Failure
151 function lti_delete_instance($id) {
154 if (! $basiclti = $DB->get_record("lti", array("id" => $id))) {
160 # Delete any dependent records here #
161 lti_grade_item_delete($basiclti);
163 return $DB->delete_records("lti", array("id" => $basiclti->id));
166 function lti_get_coursemodule_info($coursemodule) {
169 $lti = $DB->get_record('lti', array('id' => $coursemodule->instance), 'icon, secureicon');
171 $info = new stdClass();
173 //We want to use the right icon based on whether the current page is being requested over http or https.
174 //There's a potential problem here as the icon URLs are cached in the modinfo field and won't be updated for each request.
175 if (lti_request_is_using_ssl() && !empty($lti->secureicon)) {
176 $info->icon = $lti->secureicon;
178 if (!empty($lti->icon)) {
179 $info->icon = $lti->icon;
187 * Return a small object with summary information about what a
188 * user has done with a given particular instance of this module
189 * Used for user activity reports.
190 * $return->time = the time they did it
191 * $return->info = a short text description
194 * @TODO: implement this moodle function (if needed)
196 function lti_user_outline($course, $user, $mod, $basiclti) {
201 * Print a detailed representation of what a user has done with
202 * a given particular instance of this module, for user activity reports.
205 * @TODO: implement this moodle function (if needed)
207 function lti_user_complete($course, $user, $mod, $basiclti) {
212 * Given a course and a time, this module should find recent activity
213 * that has occurred in basiclti activities and print it out.
214 * Return true if there was output, or false is there was none.
218 * @TODO: implement this moodle function
220 function lti_print_recent_activity($course, $isteacher, $timestart) {
221 return false; // True if anything was printed, otherwise false
225 * Function to be run periodically according to the moodle cron
226 * This function searches for things that need to be done, such
227 * as sending out mail, toggling flags etc ...
232 function lti_cron () {
237 * Must return an array of grades for a given instance of this module,
238 * indexed by user. It also returns a maximum allowed grade.
241 * $return->grades = array of grades;
242 * $return->maxgrade = maximum allowed grade;
246 * @param int $basicltiid ID of an instance of this module
247 * @return mixed Null or object with an array of grades and with the maximum grade
249 * @TODO: implement this moodle function (if needed)
251 function lti_grades($basicltiid) {
256 * Must return an array of user records (all data) who are participants
257 * for a given instance of basiclti. Must include every user involved
258 * in the instance, independient of his role (student, teacher, admin...)
259 * See other modules as example.
261 * @param int $basicltiid ID of an instance of this module
262 * @return mixed boolean/array of students
264 * @TODO: implement this moodle function
266 function lti_get_participants($basicltiid) {
271 * This function returns if a scale is being used by one basiclti
272 * it it has support for grading and scales. Commented code should be
273 * modified if necessary. See forum, glossary or journal modules
276 * @param int $basicltiid ID of an instance of this module
279 * @TODO: implement this moodle function (if needed)
281 function lti_scale_used ($basicltiid, $scaleid) {
284 //$rec = get_record("basiclti","id","$basicltiid","scale","-$scaleid");
286 //if (!empty($rec) && !empty($scaleid)) {
294 * Checks if scale is being used by any instance of basiclti.
295 * This function was added in 1.9
297 * This is used to find out if scale used anywhere
298 * @param $scaleid int
299 * @return boolean True if the scale is used by any basiclti
302 function lti_scale_used_anywhere($scaleid) {
305 if ($scaleid and $DB->record_exists('lti', array('grade' => -$scaleid))) {
313 * Execute post-install custom actions for the module
314 * This function was added in 1.9
316 * @return boolean true if success, false on error
318 function lti_install() {
323 * Execute post-uninstall custom actions for the module
324 * This function was added in 1.9
326 * @return boolean true if success, false on error
328 function lti_uninstall() {
333 * Returns available Basic LTI types
335 * @return array of basicLTI types
337 function lti_get_lti_types() {
340 return $DB->get_records('lti_types');
344 * Create grade item for given basiclti
346 * @param object $basiclti object with extra cmidnumber
347 * @param mixed optional array/object of grade(s); 'reset' means reset grades in gradebook
348 * @return int 0 if ok, error code otherwise
350 function lti_grade_item_update($basiclti, $grades=null) {
352 require_once($CFG->libdir.'/gradelib.php');
354 $params = array('itemname'=>$basiclti->name, 'idnumber'=>$basiclti->cmidnumber);
356 if ($basiclti->grade > 0) {
357 $params['gradetype'] = GRADE_TYPE_VALUE;
358 $params['grademax'] = $basiclti->grade;
359 $params['grademin'] = 0;
361 } else if ($basiclti->grade < 0) {
362 $params['gradetype'] = GRADE_TYPE_SCALE;
363 $params['scaleid'] = -$basiclti->grade;
366 $params['gradetype'] = GRADE_TYPE_TEXT; // allow text comments only
369 if ($grades === 'reset') {
370 $params['reset'] = true;
374 return grade_update('mod/lti', $basiclti->course, 'mod', 'lti', $basiclti->id, 0, $grades, $params);
378 * Delete grade item for given basiclti
380 * @param object $basiclti object
381 * @return object basiclti
383 function lti_grade_item_delete($basiclti) {
385 require_once($CFG->libdir.'/gradelib.php');
387 return grade_update('mod/lti', $basiclti->course, 'mod', 'lti', $basiclti->id, 0, null, array('deleted'=>1));
390 function lti_extend_settings_navigation($settings, $parentnode) {
393 if (has_capability('mod/lti:grade', get_context_instance(CONTEXT_MODULE, $PAGE->cm->id))) {
394 $keys = $parentnode->get_children_key_list();
396 $node = navigation_node::create('Submissions',
397 new moodle_url('/mod/lti/grade.php', array('id'=>$PAGE->cm->id)),
398 navigation_node::TYPE_SETTING, null, 'mod_lti_submissions');
400 $parentnode->add_node($node, $keys[1]);