mod/lti/lib.php

   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 // 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.
  34
  35 /**
  36  * This file contains a library of functions and constants for the lti module
  37  *
  38  * @package mod_lti
  39  * @copyright  2009 Marc Alier, Jordi Piguillem, Nikolas Galanis
  40  *  marc.alier@upc.edu
  41  * @copyright  2009 Universitat Politecnica de Catalunya http://www.upc.edu
  42  * @author     Marc Alier
  43  * @author     Jordi Piguillem
  44  * @author     Nikolas Galanis
  45  * @author     Chris Scribner
  46  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  47  */
  48
  49 defined('MOODLE_INTERNAL') || die;
  50
  51 /**
  52  * List of features supported in URL module
  53  * @param string $feature FEATURE_xx constant for requested feature
  54  * @return mixed True if module supports feature, false if not, null if doesn't know or string for the module purpose.
  55  */
  56 function lti_supports($feature) {
  57     switch ($feature) {
  58         case FEATURE_GROUPS:
  59         case FEATURE_GROUPINGS:
  60             return false;
  61         case FEATURE_MOD_INTRO:
  62         case FEATURE_COMPLETION_TRACKS_VIEWS:
  63         case FEATURE_GRADE_HAS_GRADE:
  64         case FEATURE_GRADE_OUTCOMES:
  65         case FEATURE_BACKUP_MOODLE2:
  66         case FEATURE_SHOW_DESCRIPTION:
  67             return true;
  68         case FEATURE_MOD_PURPOSE:
  69             return MOD_PURPOSE_CONTENT;
  70
  71         default:
  72             return null;
  73     }
  74 }
  75
  76 /**
  77  * Given an object containing all the necessary data,
  78  * (defined by the form in mod.html) this function
  79  * will create a new instance and return the id number
  80  * of the new instance.
  81  *
  82  * @param object $instance An object from the form in mod.html
  83  * @return int The id of the newly inserted basiclti record
  84  **/
  85 function lti_add_instance($lti, $mform) {
  86     global $DB, $CFG;
  87     require_once($CFG->dirroot.'/mod/lti/locallib.php');
  88
  89     if (!isset($lti->toolurl)) {
  90         $lti->toolurl = '';
  91     }
  92
  93     lti_load_tool_if_cartridge($lti);
  94
  95     $lti->timecreated = time();
  96     $lti->timemodified = $lti->timecreated;
  97     $lti->servicesalt = uniqid('', true);
  98     if (!isset($lti->typeid)) {
  99         $lti->typeid = null;
 100     }
 101
 102     lti_force_type_config_settings($lti, lti_get_type_config_by_instance($lti));
 103
 104     if (empty($lti->typeid) && isset($lti->urlmatchedtypeid)) {
 105         $lti->typeid = $lti->urlmatchedtypeid;
 106     }
 107
 108     if (!isset($lti->instructorchoiceacceptgrades) || $lti->instructorchoiceacceptgrades != LTI_SETTING_ALWAYS) {
 109         // The instance does not accept grades back from the provider, so set to "No grade" value 0.
 110         $lti->grade = 0;
 111     }
 112
 113     $lti->id = $DB->insert_record('lti', $lti);
 114
 115     if (isset($lti->instructorchoiceacceptgrades) && $lti->instructorchoiceacceptgrades == LTI_SETTING_ALWAYS) {
 116         if (!isset($lti->cmidnumber)) {
 117             $lti->cmidnumber = '';
 118         }
 119
 120         lti_grade_item_update($lti);
 121     }
 122
 123     $services = lti_get_services();
 124     foreach ($services as $service) {
 125         $service->instance_added( $lti );
 126     }
 127
 128     $completiontimeexpected = !empty($lti->completionexpected) ? $lti->completionexpected : null;
 129     \core_completion\api::update_completion_date_event($lti->coursemodule, 'lti', $lti->id, $completiontimeexpected);
 130
 131     return $lti->id;
 132 }
 133
 134 /**
 135  * Given an object containing all the necessary data,
 136  * (defined by the form in mod.html) this function
 137  * will update an existing instance with new data.
 138  *
 139  * @param object $instance An object from the form in mod.html
 140  * @return boolean Success/Fail
 141  **/
 142 function lti_update_instance($lti, $mform) {
 143     global $DB, $CFG;
 144     require_once($CFG->dirroot.'/mod/lti/locallib.php');
 145
 146     lti_load_tool_if_cartridge($lti);
 147
 148     $lti->timemodified = time();
 149     $lti->id = $lti->instance;
 150
 151     if (!isset($lti->showtitlelaunch)) {
 152         $lti->showtitlelaunch = 0;
 153     }
 154
 155     if (!isset($lti->showdescriptionlaunch)) {
 156         $lti->showdescriptionlaunch = 0;
 157     }
 158
 159     lti_force_type_config_settings($lti, lti_get_type_config_by_instance($lti));
 160
 161     if (isset($lti->instructorchoiceacceptgrades) && $lti->instructorchoiceacceptgrades == LTI_SETTING_ALWAYS) {
 162         lti_grade_item_update($lti);
 163     } else {
 164         // Instance is no longer accepting grades from Provider, set grade to "No grade" value 0.
 165         $lti->grade = 0;
 166         $lti->instructorchoiceacceptgrades = 0;
 167
 168         lti_grade_item_delete($lti);
 169     }
 170
 171     if ($lti->typeid == 0 && isset($lti->urlmatchedtypeid)) {
 172         $lti->typeid = $lti->urlmatchedtypeid;
 173     }
 174
 175     $services = lti_get_services();
 176     foreach ($services as $service) {
 177         $service->instance_updated( $lti );
 178     }
 179
 180     $completiontimeexpected = !empty($lti->completionexpected) ? $lti->completionexpected : null;
 181     \core_completion\api::update_completion_date_event($lti->coursemodule, 'lti', $lti->id, $completiontimeexpected);
 182
 183     return $DB->update_record('lti', $lti);
 184 }
 185
 186 /**
 187  * Given an ID of an instance of this module,
 188  * this function will permanently delete the instance
 189  * and any data that depends on it.
 190  *
 191  * @param int $id Id of the module instance
 192  * @return boolean Success/Failure
 193  **/
 194 function lti_delete_instance($id) {
 195     global $DB, $CFG;
 196     require_once($CFG->dirroot.'/mod/lti/locallib.php');
 197
 198     if (! $basiclti = $DB->get_record("lti", array("id" => $id))) {
 199         return false;
 200     }
 201
 202     $result = true;
 203
 204     // Delete any dependent records here.
 205     lti_grade_item_delete($basiclti);
 206
 207     $ltitype = $DB->get_record('lti_types', array('id' => $basiclti->typeid));
 208     if ($ltitype) {
 209         $DB->delete_records('lti_tool_settings',
 210             array('toolproxyid' => $ltitype->toolproxyid, 'course' => $basiclti->course, 'coursemoduleid' => $id));
 211     }
 212
 213     $cm = get_coursemodule_from_instance('lti', $id);
 214     \core_completion\api::update_completion_date_event($cm->id, 'lti', $id, null);
 215
 216     // We must delete the module record after we delete the grade item.
 217     if ($DB->delete_records("lti", array("id" => $basiclti->id)) ) {
 218         $services = lti_get_services();
 219         foreach ($services as $service) {
 220             $service->instance_deleted( $id );
 221         }
 222         return true;
 223     }
 224     return false;
 225
 226 }
 227
 228 /**
 229  * Return the preconfigured tools which are configured for inclusion in the activity picker.
 230  *
 231  * @param \core_course\local\entity\content_item $defaultmodulecontentitem reference to the content item for the LTI module.
 232  * @param \stdClass $user the user object, to use for cap checks if desired.
 233  * @param stdClass $course the course to scope items to.
 234  * @return array the array of content items.
 235  */
 236 function lti_get_course_content_items(\core_course\local\entity\content_item $defaultmodulecontentitem, \stdClass $user,
 237         \stdClass $course) {
 238     global $CFG, $OUTPUT;
 239     require_once($CFG->dirroot.'/mod/lti/locallib.php');
 240
 241     $types = [];
 242
 243     // The 'External tool' entry (the main module content item), should always take the id of 1.
 244     if (has_capability('mod/lti:addmanualinstance', context_course::instance($course->id), $user)) {
 245         $types = [new \core_course\local\entity\content_item(
 246             1,
 247             $defaultmodulecontentitem->get_name(),
 248             $defaultmodulecontentitem->get_title(),
 249             $defaultmodulecontentitem->get_link(),
 250             $defaultmodulecontentitem->get_icon(),
 251             $defaultmodulecontentitem->get_help(),
 252             $defaultmodulecontentitem->get_archetype(),
 253             $defaultmodulecontentitem->get_component_name(),
 254             $defaultmodulecontentitem->get_purpose()
 255         )];
 256     }
 257
 258     // Other, preconfigured tools take their own id + 1, so we'll never clash with the module's entry.
 259     $preconfiguredtools = lti_get_configured_types($course->id, $defaultmodulecontentitem->get_link()->param('sr'));
 260     foreach ($preconfiguredtools as $preconfiguredtool) {
 261
 262         // Append the help link to the help text.
 263         if (isset($preconfiguredtool->help)) {
 264             if (isset($preconfiguredtool->helplink)) {
 265                 $linktext = get_string('morehelp');
 266                 $preconfiguredtool->help .= html_writer::tag('div',
 267                     $OUTPUT->doc_link($preconfiguredtool->helplink, $linktext, true), ['class' => 'helpdoclink']);
 268             }
 269         } else {
 270             $preconfiguredtool->help = '';
 271         }
 272
 273         $types[] = new \core_course\local\entity\content_item(
 274             $preconfiguredtool->id + 1,
 275             $preconfiguredtool->name,
 276             new \core_course\local\entity\string_title($preconfiguredtool->title),
 277             $preconfiguredtool->link,
 278             $preconfiguredtool->icon,
 279             $preconfiguredtool->help,
 280             $defaultmodulecontentitem->get_archetype(),
 281             $defaultmodulecontentitem->get_component_name(),
 282             $defaultmodulecontentitem->get_purpose()
 283         );
 284     }
 285     return $types;
 286 }
 287
 288 /**
 289  * Return all content items which can be added to any course.
 290  *
 291  * @param \core_course\local\entity\content_item $defaultmodulecontentitem
 292  * @return array the array of content items.
 293  */
 294 function mod_lti_get_all_content_items(\core_course\local\entity\content_item $defaultmodulecontentitem): array {
 295     global $OUTPUT, $CFG;
 296     require_once($CFG->dirroot . '/mod/lti/locallib.php'); // For access to constants.
 297
 298     // The 'External tool' entry (the main module content item), should always take the id of 1.
 299     $types = [new \core_course\local\entity\content_item(
 300         1,
 301         $defaultmodulecontentitem->get_name(),
 302         $defaultmodulecontentitem->get_title(),
 303         $defaultmodulecontentitem->get_link(),
 304         $defaultmodulecontentitem->get_icon(),
 305         $defaultmodulecontentitem->get_help(),
 306         $defaultmodulecontentitem->get_archetype(),
 307         $defaultmodulecontentitem->get_component_name(),
 308         $defaultmodulecontentitem->get_purpose()
 309     )];
 310
 311     foreach (lti_get_lti_types() as $ltitype) {
 312         if ($ltitype->coursevisible != LTI_COURSEVISIBLE_ACTIVITYCHOOSER) {
 313             continue;
 314         }
 315         $type           = new stdClass();
 316         $type->id       = $ltitype->id;
 317         $type->modclass = MOD_CLASS_ACTIVITY;
 318         $type->name     = 'lti_type_' . $ltitype->id;
 319         // Clean the name. We don't want tags here.
 320         $type->title    = clean_param($ltitype->name, PARAM_NOTAGS);
 321         $trimmeddescription = trim($ltitype->description ?? '');
 322         $type->help = '';
 323         if ($trimmeddescription != '') {
 324             // Clean the description. We don't want tags here.
 325             $type->help     = clean_param($trimmeddescription, PARAM_NOTAGS);
 326             $type->helplink = get_string('modulename_shortcut_link', 'lti');
 327         }
 328         if (empty($ltitype->icon)) {
 329             $type->icon = $OUTPUT->pix_icon('monologo', '', 'lti', array('class' => 'icon'));
 330         } else {
 331             $type->icon = html_writer::empty_tag('img', array('src' => $ltitype->icon, 'alt' => $ltitype->name, 'class' => 'icon'));
 332         }
 333         $type->link = new moodle_url('/course/modedit.php', array('add' => 'lti', 'return' => 0, 'typeid' => $ltitype->id));
 334
 335         $types[] = new \core_course\local\entity\content_item(
 336             $type->id + 1,
 337             $type->name,
 338             new \core_course\local\entity\string_title($type->title),
 339             $type->link,
 340             $type->icon,
 341             $type->help,
 342             $defaultmodulecontentitem->get_archetype(),
 343             $defaultmodulecontentitem->get_component_name(),
 344             $defaultmodulecontentitem->get_purpose()
 345         );
 346     }
 347
 348     return $types;
 349 }
 350
 351 /**
 352  * Given a coursemodule object, this function returns the extra
 353  * information needed to print this activity in various places.
 354  * For this module we just need to support external urls as
 355  * activity icons
 356  *
 357  * @param stdClass $coursemodule
 358  * @return cached_cm_info info
 359  */
 360 function lti_get_coursemodule_info($coursemodule) {
 361     global $DB, $CFG;
 362     require_once($CFG->dirroot.'/mod/lti/locallib.php');
 363
 364     if (!$lti = $DB->get_record('lti', array('id' => $coursemodule->instance),
 365             'icon, secureicon, intro, introformat, name, typeid, toolurl, launchcontainer')) {
 366         return null;
 367     }
 368
 369     $info = new cached_cm_info();
 370
 371     if ($coursemodule->showdescription) {
 372         // Convert intro to html. Do not filter cached version, filters run at display time.
 373         $info->content = format_module_intro('lti', $lti, $coursemodule->id, false);
 374     }
 375
 376     if (!empty($lti->typeid)) {
 377         $toolconfig = lti_get_type_config($lti->typeid);
 378     } else if ($tool = lti_get_tool_by_url_match($lti->toolurl)) {
 379         $toolconfig = lti_get_type_config($tool->id);
 380     } else {
 381         $toolconfig = array();
 382     }
 383
 384     // We want to use the right icon based on whether the
 385     // current page is being requested over http or https.
 386     if (lti_request_is_using_ssl() &&
 387         (!empty($lti->secureicon) || (isset($toolconfig['secureicon']) && !empty($toolconfig['secureicon'])))) {
 388         if (!empty($lti->secureicon)) {
 389             $info->iconurl = new moodle_url($lti->secureicon);
 390         } else {
 391             $info->iconurl = new moodle_url($toolconfig['secureicon']);
 392         }
 393     } else if (!empty($lti->icon)) {
 394         $info->iconurl = new moodle_url($lti->icon);
 395     } else if (isset($toolconfig['icon']) && !empty($toolconfig['icon'])) {
 396         $info->iconurl = new moodle_url($toolconfig['icon']);
 397     }
 398
 399     // Does the link open in a new window?
 400     $launchcontainer = lti_get_launch_container($lti, $toolconfig);
 401     if ($launchcontainer == LTI_LAUNCH_CONTAINER_WINDOW) {
 402         $launchurl = new moodle_url('/mod/lti/launch.php', array('id' => $coursemodule->id));
 403         $info->onclick = "window.open('" . $launchurl->out(false) . "', 'lti-".$coursemodule->id."'); return false;";
 404     }
 405
 406     $info->name = $lti->name;
 407
 408     return $info;
 409 }
 410
 411 /**
 412  * Return a small object with summary information about what a
 413  * user has done with a given particular instance of this module
 414  * Used for user activity reports.
 415  * $return->time = the time they did it
 416  * $return->info = a short text description
 417  *
 418  * @return null
 419  * @TODO: implement this moodle function (if needed)
 420  **/
 421 function lti_user_outline($course, $user, $mod, $basiclti) {
 422     return null;
 423 }
 424
 425 /**
 426  * Print a detailed representation of what a user has done with
 427  * a given particular instance of this module, for user activity reports.
 428  *
 429  * @return boolean
 430  * @TODO: implement this moodle function (if needed)
 431  **/
 432 function lti_user_complete($course, $user, $mod, $basiclti) {
 433     return true;
 434 }
 435
 436 /**
 437  * Given a course and a time, this module should find recent activity
 438  * that has occurred in basiclti activities and print it out.
 439  * Return true if there was output, or false is there was none.
 440  *
 441  * @uses $CFG
 442  * @return boolean
 443  * @TODO: implement this moodle function
 444  **/
 445 function lti_print_recent_activity($course, $isteacher, $timestart) {
 446     return false;  //  True if anything was printed, otherwise false.
 447 }
 448
 449 /**
 450  * Function to be run periodically according to the moodle cron
 451  * This function searches for things that need to be done, such
 452  * as sending out mail, toggling flags etc ...
 453  *
 454  * @uses $CFG
 455  * @return boolean
 456  **/
 457 function lti_cron () {
 458     return true;
 459 }
 460
 461 /**
 462  * Must return an array of grades for a given instance of this module,
 463  * indexed by user.  It also returns a maximum allowed grade.
 464  *
 465  * Example:
 466  *    $return->grades = array of grades;
 467  *    $return->maxgrade = maximum allowed grade;
 468  *
 469  *    return $return;
 470  *
 471  * @param int $basicltiid ID of an instance of this module
 472  * @return mixed Null or object with an array of grades and with the maximum grade
 473  *
 474  * @TODO: implement this moodle function (if needed)
 475  **/
 476 function lti_grades($basicltiid) {
 477     return null;
 478 }
 479
 480 /**
 481  * @deprecated since Moodle 3.8
 482  */
 483 function lti_scale_used() {
 484     throw new coding_exception('lti_scale_used() can not be used anymore. Plugins can implement ' .
 485         '<modname>_scale_used_anywhere, all implementations of <modname>_scale_used are now ignored');
 486 }
 487
 488 /**
 489  * Checks if scale is being used by any instance of basiclti.
 490  * This function was added in 1.9
 491  *
 492  * This is used to find out if scale used anywhere
 493  * @param $scaleid int
 494  * @return boolean True if the scale is used by any basiclti
 495  *
 496  */
 497 function lti_scale_used_anywhere($scaleid) {
 498     global $DB;
 499
 500     if ($scaleid and $DB->record_exists('lti', array('grade' => -$scaleid))) {
 501         return true;
 502     } else {
 503         return false;
 504     }
 505 }
 506
 507 /**
 508  * Execute post-install custom actions for the module
 509  * This function was added in 1.9
 510  *
 511  * @return boolean true if success, false on error
 512  */
 513 function lti_install() {
 514      return true;
 515 }
 516
 517 /**
 518  * Execute post-uninstall custom actions for the module
 519  * This function was added in 1.9
 520  *
 521  * @return boolean true if success, false on error
 522  */
 523 function lti_uninstall() {
 524     return true;
 525 }
 526
 527 /**
 528  * Returns available Basic LTI types
 529  *
 530  * @return array of basicLTI types
 531  */
 532 function lti_get_lti_types() {
 533     global $DB;
 534
 535     return $DB->get_records('lti_types', null, 'state DESC, timemodified DESC');
 536 }
 537
 538 /**
 539  * Returns available Basic LTI types that match the given
 540  * tool proxy id
 541  *
 542  * @param int $toolproxyid Tool proxy id
 543  * @return array of basicLTI types
 544  */
 545 function lti_get_lti_types_from_proxy_id($toolproxyid) {
 546     global $DB;
 547
 548     return $DB->get_records('lti_types', array('toolproxyid' => $toolproxyid), 'state DESC, timemodified DESC');
 549 }
 550
 551 /**
 552  * Create grade item for given basiclti
 553  *
 554  * @category grade
 555  * @param object $basiclti object with extra cmidnumber
 556  * @param mixed optional array/object of grade(s); 'reset' means reset grades in gradebook
 557  * @return int 0 if ok, error code otherwise
 558  */
 559 function lti_grade_item_update($basiclti, $grades = null) {
 560     global $CFG;
 561     require_once($CFG->libdir.'/gradelib.php');
 562     require_once($CFG->dirroot.'/mod/lti/servicelib.php');
 563
 564     if (!lti_accepts_grades($basiclti)) {
 565         return 0;
 566     }
 567
 568     $params = array('itemname' => $basiclti->name, 'idnumber' => $basiclti->cmidnumber);
 569
 570     if ($basiclti->grade > 0) {
 571         $params['gradetype'] = GRADE_TYPE_VALUE;
 572         $params['grademax']  = $basiclti->grade;
 573         $params['grademin']  = 0;
 574
 575     } else if ($basiclti->grade < 0) {
 576         $params['gradetype'] = GRADE_TYPE_SCALE;
 577         $params['scaleid']   = -$basiclti->grade;
 578
 579     } else {
 580         $params['gradetype'] = GRADE_TYPE_TEXT; // Allow text comments only.
 581     }
 582
 583     if ($grades === 'reset') {
 584         $params['reset'] = true;
 585         $grades = null;
 586     }
 587
 588     return grade_update('mod/lti', $basiclti->course, 'mod', 'lti', $basiclti->id, 0, $grades, $params);
 589 }
 590
 591 /**
 592  * Update activity grades
 593  *
 594  * @param stdClass $basiclti The LTI instance
 595  * @param int      $userid Specific user only, 0 means all.
 596  * @param bool     $nullifnone Not used
 597  */
 598 function lti_update_grades($basiclti, $userid=0, $nullifnone=true) {
 599     global $CFG;
 600     require_once($CFG->dirroot.'/mod/lti/servicelib.php');
 601     // LTI doesn't have its own grade table so the only thing to do is update the grade item.
 602     if (lti_accepts_grades($basiclti)) {
 603         lti_grade_item_update($basiclti);
 604     }
 605 }
 606
 607 /**
 608  * Delete grade item for given basiclti
 609  *
 610  * @category grade
 611  * @param object $basiclti object
 612  * @return object basiclti
 613  */
 614 function lti_grade_item_delete($basiclti) {
 615     global $CFG;
 616     require_once($CFG->libdir.'/gradelib.php');
 617
 618     return grade_update('mod/lti', $basiclti->course, 'mod', 'lti', $basiclti->id, 0, null, array('deleted' => 1));
 619 }
 620
 621 /**
 622  * Log post actions
 623  *
 624  * @return array
 625  */
 626 function lti_get_post_actions() {
 627     return array();
 628 }
 629
 630 /**
 631  * Log view actions
 632  *
 633  * @return array
 634  */
 635 function lti_get_view_actions() {
 636     return array('view all', 'view');
 637 }
 638
 639 /**
 640  * Mark the activity completed (if required) and trigger the course_module_viewed event.
 641  *
 642  * @param  stdClass $lti        lti object
 643  * @param  stdClass $course     course object
 644  * @param  stdClass $cm         course module object
 645  * @param  stdClass $context    context object
 646  * @since Moodle 3.0
 647  */
 648 function lti_view($lti, $course, $cm, $context) {
 649
 650     // Trigger course_module_viewed event.
 651     $params = array(
 652         'context' => $context,
 653         'objectid' => $lti->id
 654     );
 655
 656     $event = \mod_lti\event\course_module_viewed::create($params);
 657     $event->add_record_snapshot('course_modules', $cm);
 658     $event->add_record_snapshot('course', $course);
 659     $event->add_record_snapshot('lti', $lti);
 660     $event->trigger();
 661
 662     // Completion.
 663     $completion = new completion_info($course);
 664     $completion->set_module_viewed($cm);
 665 }
 666
 667 /**
 668  * Check if the module has any update that affects the current user since a given time.
 669  *
 670  * @param  cm_info $cm course module data
 671  * @param  int $from the time to check updates from
 672  * @param  array $filter  if we need to check only specific updates
 673  * @return stdClass an object with the different type of areas indicating if they were updated or not
 674  * @since Moodle 3.2
 675  */
 676 function lti_check_updates_since(cm_info $cm, $from, $filter = array()) {
 677     global $DB, $USER;
 678
 679     $updates = course_check_module_updates_since($cm, $from, array(), $filter);
 680
 681     // Check if there is a new submission.
 682     $updates->submissions = (object) array('updated' => false);
 683     $select = 'ltiid = :id AND userid = :userid AND (datesubmitted > :since1 OR dateupdated > :since2)';
 684     $params = array('id' => $cm->instance, 'userid' => $USER->id, 'since1' => $from, 'since2' => $from);
 685     $submissions = $DB->get_records_select('lti_submission', $select, $params, '', 'id');
 686     if (!empty($submissions)) {
 687         $updates->submissions->updated = true;
 688         $updates->submissions->itemids = array_keys($submissions);
 689     }
 690
 691     // Now, teachers should see other students updates.
 692     if (has_capability('mod/lti:manage', $cm->context)) {
 693         $select = 'ltiid = :id AND (datesubmitted > :since1 OR dateupdated > :since2)';
 694         $params = array('id' => $cm->instance, 'since1' => $from, 'since2' => $from);
 695
 696         if (groups_get_activity_groupmode($cm) == SEPARATEGROUPS) {
 697             $groupusers = array_keys(groups_get_activity_shared_group_members($cm));
 698             if (empty($groupusers)) {
 699                 return $updates;
 700             }
 701             list($insql, $inparams) = $DB->get_in_or_equal($groupusers, SQL_PARAMS_NAMED);
 702             $select .= ' AND userid ' . $insql;
 703             $params = array_merge($params, $inparams);
 704         }
 705
 706         $updates->usersubmissions = (object) array('updated' => false);
 707         $submissions = $DB->get_records_select('lti_submission', $select, $params, '', 'id');
 708         if (!empty($submissions)) {
 709             $updates->usersubmissions->updated = true;
 710             $updates->usersubmissions->itemids = array_keys($submissions);
 711         }
 712     }
 713
 714     return $updates;
 715 }
 716
 717 /**
 718  * Get icon mapping for font-awesome.
 719  */
 720 function mod_lti_get_fontawesome_icon_map() {
 721     return [
 722         'mod_lti:warning' => 'fa-exclamation text-warning',
 723     ];
 724 }
 725
 726 /**
 727  * This function receives a calendar event and returns the action associated with it, or null if there is none.
 728  *
 729  * This is used by block_myoverview in order to display the event appropriately. If null is returned then the event
 730  * is not displayed on the block.
 731  *
 732  * @param calendar_event $event
 733  * @param \core_calendar\action_factory $factory
 734  * @param int $userid User id to use for all capability checks, etc. Set to 0 for current user (default).
 735  * @return \core_calendar\local\event\entities\action_interface|null
 736  */
 737 function mod_lti_core_calendar_provide_event_action(calendar_event $event,
 738                                                       \core_calendar\action_factory $factory,
 739                                                       int $userid = 0) {
 740     global $USER;
 741
 742     if (empty($userid)) {
 743         $userid = $USER->id;
 744     }
 745
 746     $cm = get_fast_modinfo($event->courseid, $userid)->instances['lti'][$event->instance];
 747
 748     if (!$cm->uservisible) {
 749         // The module is not visible to the user for any reason.
 750         return null;
 751     }
 752
 753     $completion = new \completion_info($cm->get_course());
 754
 755     $completiondata = $completion->get_data($cm, false, $userid);
 756
 757     if ($completiondata->completionstate != COMPLETION_INCOMPLETE) {
 758         return null;
 759     }
 760
 761     return $factory->create_instance(
 762         get_string('view'),
 763         new \moodle_url('/mod/lti/view.php', ['id' => $cm->id]),
 764         1,
 765         true
 766     );
 767 }