lib/badgeslib.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 /**
  18  * Contains classes, functions and constants used in badges.
  19  *
  20  * @package    core
  21  * @subpackage badges
  22  * @copyright  2012 onwards Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  * @author     Yuliya Bozhko <yuliya.bozhko@totaralms.com>
  25  */
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 /* Include required award criteria library. */
  30 require_once($CFG->dirroot . '/badges/criteria/award_criteria.php');
  31
  32 /*
  33  * Number of records per page.
  34 */
  35 define('BADGE_PERPAGE', 50);
  36
  37 /*
  38  * Badge award criteria aggregation method.
  39  */
  40 define('BADGE_CRITERIA_AGGREGATION_ALL', 1);
  41
  42 /*
  43  * Badge award criteria aggregation method.
  44  */
  45 define('BADGE_CRITERIA_AGGREGATION_ANY', 2);
  46
  47 /*
  48  * Inactive badge means that this badge cannot be earned and has not been awarded
  49  * yet. Its award criteria can be changed.
  50  */
  51 define('BADGE_STATUS_INACTIVE', 0);
  52
  53 /*
  54  * Active badge means that this badge can we earned, but it has not been awarded
  55  * yet. Can be deactivated for the purpose of changing its criteria.
  56  */
  57 define('BADGE_STATUS_ACTIVE', 1);
  58
  59 /*
  60  * Inactive badge can no longer be earned, but it has been awarded in the past and
  61  * therefore its criteria cannot be changed.
  62  */
  63 define('BADGE_STATUS_INACTIVE_LOCKED', 2);
  64
  65 /*
  66  * Active badge means that it can be earned and has already been awarded to users.
  67  * Its criteria cannot be changed any more.
  68  */
  69 define('BADGE_STATUS_ACTIVE_LOCKED', 3);
  70
  71 /*
  72  * Archived badge is considered deleted and can no longer be earned and is not
  73  * displayed in the list of all badges.
  74  */
  75 define('BADGE_STATUS_ARCHIVED', 4);
  76
  77 /*
  78  * Badge type for site badges.
  79  */
  80 define('BADGE_TYPE_SITE', 1);
  81
  82 /*
  83  * Badge type for course badges.
  84  */
  85 define('BADGE_TYPE_COURSE', 2);
  86
  87 /*
  88  * Badge messaging schedule options.
  89  */
  90 define('BADGE_MESSAGE_NEVER', 0);
  91 define('BADGE_MESSAGE_ALWAYS', 1);
  92 define('BADGE_MESSAGE_DAILY', 2);
  93 define('BADGE_MESSAGE_WEEKLY', 3);
  94 define('BADGE_MESSAGE_MONTHLY', 4);
  95
  96 /*
  97  * URL of backpack. Custom ones can be added.
  98  */
  99 define('BADGRIO_BACKPACKAPIURL', 'https://api.badgr.io/v2');
 100 define('BADGRIO_BACKPACKWEBURL', 'https://badgr.io');
 101
 102 /*
 103  * @deprecated since 3.7. Use the urls in the badge_external_backpack table instead.
 104  */
 105 define('BADGE_BACKPACKURL', 'https://backpack.openbadges.org');
 106
 107 /*
 108  * @deprecated since 3.9 (MDL-66357).
 109  */
 110 define('BADGE_BACKPACKAPIURL', 'https://backpack.openbadges.org');
 111 define('BADGE_BACKPACKWEBURL', 'https://backpack.openbadges.org');
 112
 113 /*
 114  * Open Badges specifications.
 115  */
 116 define('OPEN_BADGES_V1', 1);
 117 define('OPEN_BADGES_V2', 2);
 118 define('OPEN_BADGES_V2P1', 2.1);
 119
 120 /*
 121  * Only use for Open Badges 2.0 specification
 122  */
 123 define('OPEN_BADGES_V2_CONTEXT', 'https://w3id.org/openbadges/v2');
 124 define('OPEN_BADGES_V2_TYPE_ASSERTION', 'Assertion');
 125 define('OPEN_BADGES_V2_TYPE_BADGE', 'BadgeClass');
 126 define('OPEN_BADGES_V2_TYPE_ISSUER', 'Issuer');
 127 define('OPEN_BADGES_V2_TYPE_ENDORSEMENT', 'Endorsement');
 128 define('OPEN_BADGES_V2_TYPE_AUTHOR', 'Author');
 129
 130 // Global badge class has been moved to the component namespace.
 131 class_alias('\core_badges\badge', 'badge');
 132
 133 /**
 134  * Sends notifications to users about awarded badges.
 135  *
 136  * @param badge $badge Badge that was issued
 137  * @param int $userid Recipient ID
 138  * @param string $issued Unique hash of an issued badge
 139  * @param string $filepathhash File path hash of an issued badge for attachments
 140  */
 141 function badges_notify_badge_award(badge $badge, $userid, $issued, $filepathhash) {
 142     global $CFG, $DB;
 143
 144     $admin = get_admin();
 145     $userfrom = new stdClass();
 146     $userfrom->id = $admin->id;
 147     $userfrom->email = !empty($CFG->badges_defaultissuercontact) ? $CFG->badges_defaultissuercontact : $admin->email;
 148     foreach (get_all_user_name_fields() as $addname) {
 149         $userfrom->$addname = !empty($CFG->badges_defaultissuername) ? '' : $admin->$addname;
 150     }
 151     $userfrom->firstname = !empty($CFG->badges_defaultissuername) ? $CFG->badges_defaultissuername : $admin->firstname;
 152     $userfrom->maildisplay = true;
 153
 154     $issuedlink = html_writer::link(new moodle_url('/badges/badge.php', array('hash' => $issued)), $badge->name);
 155     $userto = $DB->get_record('user', array('id' => $userid), '*', MUST_EXIST);
 156
 157     $params = new stdClass();
 158     $params->badgename = $badge->name;
 159     $params->username = fullname($userto);
 160     $params->badgelink = $issuedlink;
 161     $message = badge_message_from_template($badge->message, $params);
 162     $plaintext = html_to_text($message);
 163
 164     // Notify recipient.
 165     $eventdata = new \core\message\message();
 166     $eventdata->courseid          = is_null($badge->courseid) ? SITEID : $badge->courseid; // Profile/site come with no courseid.
 167     $eventdata->component         = 'moodle';
 168     $eventdata->name              = 'badgerecipientnotice';
 169     $eventdata->userfrom          = $userfrom;
 170     $eventdata->userto            = $userto;
 171     $eventdata->notification      = 1;
 172     $eventdata->subject           = $badge->messagesubject;
 173     $eventdata->fullmessage       = $plaintext;
 174     $eventdata->fullmessageformat = FORMAT_HTML;
 175     $eventdata->fullmessagehtml   = $message;
 176     $eventdata->smallmessage      = '';
 177     $eventdata->customdata        = [
 178         'notificationiconurl' => moodle_url::make_pluginfile_url(
 179             $badge->get_context()->id, 'badges', 'badgeimage', $badge->id, '/', 'f1')->out(),
 180         'hash' => $issued,
 181     ];
 182
 183     // Attach badge image if possible.
 184     if (!empty($CFG->allowattachments) && $badge->attachment && is_string($filepathhash)) {
 185         $fs = get_file_storage();
 186         $file = $fs->get_file_by_hash($filepathhash);
 187         $eventdata->attachment = $file;
 188         $eventdata->attachname = str_replace(' ', '_', $badge->name) . ".png";
 189
 190         message_send($eventdata);
 191     } else {
 192         message_send($eventdata);
 193     }
 194
 195     // Notify badge creator about the award if they receive notifications every time.
 196     if ($badge->notification == 1) {
 197         $userfrom = core_user::get_noreply_user();
 198         $userfrom->maildisplay = true;
 199
 200         $creator = $DB->get_record('user', array('id' => $badge->usercreated), '*', MUST_EXIST);
 201         $a = new stdClass();
 202         $a->user = fullname($userto);
 203         $a->link = $issuedlink;
 204         $creatormessage = get_string('creatorbody', 'badges', $a);
 205         $creatorsubject = get_string('creatorsubject', 'badges', $badge->name);
 206
 207         $eventdata = new \core\message\message();
 208         $eventdata->courseid          = $badge->courseid;
 209         $eventdata->component         = 'moodle';
 210         $eventdata->name              = 'badgecreatornotice';
 211         $eventdata->userfrom          = $userfrom;
 212         $eventdata->userto            = $creator;
 213         $eventdata->notification      = 1;
 214         $eventdata->subject           = $creatorsubject;
 215         $eventdata->fullmessage       = html_to_text($creatormessage);
 216         $eventdata->fullmessageformat = FORMAT_HTML;
 217         $eventdata->fullmessagehtml   = $creatormessage;
 218         $eventdata->smallmessage      = '';
 219         $eventdata->customdata        = [
 220             'notificationiconurl' => moodle_url::make_pluginfile_url(
 221                 $badge->get_context()->id, 'badges', 'badgeimage', $badge->id, '/', 'f1')->out(),
 222             'hash' => $issued,
 223         ];
 224
 225         message_send($eventdata);
 226         $DB->set_field('badge_issued', 'issuernotified', time(), array('badgeid' => $badge->id, 'userid' => $userid));
 227     }
 228 }
 229
 230 /**
 231  * Caclulates date for the next message digest to badge creators.
 232  *
 233  * @param in $schedule Type of message schedule BADGE_MESSAGE_DAILY|BADGE_MESSAGE_WEEKLY|BADGE_MESSAGE_MONTHLY.
 234  * @return int Timestamp for next cron
 235  */
 236 function badges_calculate_message_schedule($schedule) {
 237     $nextcron = 0;
 238
 239     switch ($schedule) {
 240         case BADGE_MESSAGE_DAILY:
 241             $tomorrow = new DateTime("1 day", core_date::get_server_timezone_object());
 242             $nextcron = $tomorrow->getTimestamp();
 243             break;
 244         case BADGE_MESSAGE_WEEKLY:
 245             $nextweek = new DateTime("1 week", core_date::get_server_timezone_object());
 246             $nextcron = $nextweek->getTimestamp();
 247             break;
 248         case BADGE_MESSAGE_MONTHLY:
 249             $nextmonth = new DateTime("1 month", core_date::get_server_timezone_object());
 250             $nextcron = $nextmonth->getTimestamp();
 251             break;
 252     }
 253
 254     return $nextcron;
 255 }
 256
 257 /**
 258  * Replaces variables in a message template and returns text ready to be emailed to a user.
 259  *
 260  * @param string $message Message body.
 261  * @return string Message with replaced values
 262  */
 263 function badge_message_from_template($message, $params) {
 264     $msg = $message;
 265     foreach ($params as $key => $value) {
 266         $msg = str_replace("%$key%", $value, $msg);
 267     }
 268
 269     return $msg;
 270 }
 271
 272 /**
 273  * Get all badges.
 274  *
 275  * @param int Type of badges to return
 276  * @param int Course ID for course badges
 277  * @param string $sort An SQL field to sort by
 278  * @param string $dir The sort direction ASC|DESC
 279  * @param int $page The page or records to return
 280  * @param int $perpage The number of records to return per page
 281  * @param int $user User specific search
 282  * @return array $badge Array of records matching criteria
 283  */
 284 function badges_get_badges($type, $courseid = 0, $sort = '', $dir = '', $page = 0, $perpage = BADGE_PERPAGE, $user = 0) {
 285     global $DB;
 286     $records = array();
 287     $params = array();
 288     $where = "b.status != :deleted AND b.type = :type ";
 289     $params['deleted'] = BADGE_STATUS_ARCHIVED;
 290
 291     $userfields = array('b.id, b.name, b.status');
 292     $usersql = "";
 293     if ($user != 0) {
 294         $userfields[] = 'bi.dateissued';
 295         $userfields[] = 'bi.uniquehash';
 296         $usersql = " LEFT JOIN {badge_issued} bi ON b.id = bi.badgeid AND bi.userid = :userid ";
 297         $params['userid'] = $user;
 298         $where .= " AND (b.status = 1 OR b.status = 3) ";
 299     }
 300     $fields = implode(', ', $userfields);
 301
 302     if ($courseid != 0 ) {
 303         $where .= "AND b.courseid = :courseid ";
 304         $params['courseid'] = $courseid;
 305     }
 306
 307     $sorting = (($sort != '' && $dir != '') ? 'ORDER BY ' . $sort . ' ' . $dir : '');
 308     $params['type'] = $type;
 309
 310     $sql = "SELECT $fields FROM {badge} b $usersql WHERE $where $sorting";
 311     $records = $DB->get_records_sql($sql, $params, $page * $perpage, $perpage);
 312
 313     $badges = array();
 314     foreach ($records as $r) {
 315         $badge = new badge($r->id);
 316         $badges[$r->id] = $badge;
 317         if ($user != 0) {
 318             $badges[$r->id]->dateissued = $r->dateissued;
 319             $badges[$r->id]->uniquehash = $r->uniquehash;
 320         } else {
 321             $badges[$r->id]->awards = $DB->count_records_sql('SELECT COUNT(b.userid)
 322                                         FROM {badge_issued} b INNER JOIN {user} u ON b.userid = u.id
 323                                         WHERE b.badgeid = :badgeid AND u.deleted = 0', array('badgeid' => $badge->id));
 324             $badges[$r->id]->statstring = $badge->get_status_name();
 325         }
 326     }
 327     return $badges;
 328 }
 329
 330 /**
 331  * Get badges for a specific user.
 332  *
 333  * @param int $userid User ID
 334  * @param int $courseid Badges earned by a user in a specific course
 335  * @param int $page The page or records to return
 336  * @param int $perpage The number of records to return per page
 337  * @param string $search A simple string to search for
 338  * @param bool $onlypublic Return only public badges
 339  * @return array of badges ordered by decreasing date of issue
 340  */
 341 function badges_get_user_badges($userid, $courseid = 0, $page = 0, $perpage = 0, $search = '', $onlypublic = false) {
 342     global $CFG, $DB;
 343
 344     $params = array(
 345         'userid' => $userid
 346     );
 347     $sql = 'SELECT
 348                 bi.uniquehash,
 349                 bi.dateissued,
 350                 bi.dateexpire,
 351                 bi.id as issuedid,
 352                 bi.visible,
 353                 u.email,
 354                 b.*
 355             FROM
 356                 {badge} b,
 357                 {badge_issued} bi,
 358                 {user} u
 359             WHERE b.id = bi.badgeid
 360                 AND u.id = bi.userid
 361                 AND bi.userid = :userid';
 362
 363     if (!empty($search)) {
 364         $sql .= ' AND (' . $DB->sql_like('b.name', ':search', false) . ') ';
 365         $params['search'] = '%'.$DB->sql_like_escape($search).'%';
 366     }
 367     if ($onlypublic) {
 368         $sql .= ' AND (bi.visible = 1) ';
 369     }
 370
 371     if (empty($CFG->badges_allowcoursebadges)) {
 372         $sql .= ' AND b.courseid IS NULL';
 373     } else if ($courseid != 0) {
 374         $sql .= ' AND (b.courseid = :courseid) ';
 375         $params['courseid'] = $courseid;
 376     }
 377     $sql .= ' ORDER BY bi.dateissued DESC';
 378     $badges = $DB->get_records_sql($sql, $params, $page * $perpage, $perpage);
 379
 380     return $badges;
 381 }
 382
 383 /**
 384  * Extends the course administration navigation with the Badges page
 385  *
 386  * @param navigation_node $coursenode
 387  * @param object $course
 388  */
 389 function badges_add_course_navigation(navigation_node $coursenode, stdClass $course) {
 390     global $CFG, $SITE;
 391
 392     $coursecontext = context_course::instance($course->id);
 393     $isfrontpage = (!$coursecontext || $course->id == $SITE->id);
 394     $canmanage = has_any_capability(array('moodle/badges:viewawarded',
 395                                           'moodle/badges:createbadge',
 396                                           'moodle/badges:awardbadge',
 397                                           'moodle/badges:configurecriteria',
 398                                           'moodle/badges:configuremessages',
 399                                           'moodle/badges:configuredetails',
 400                                           'moodle/badges:deletebadge'), $coursecontext);
 401
 402     if (!empty($CFG->enablebadges) && !empty($CFG->badges_allowcoursebadges) && !$isfrontpage && $canmanage) {
 403         $coursenode->add(get_string('coursebadges', 'badges'), null,
 404                 navigation_node::TYPE_CONTAINER, null, 'coursebadges',
 405                 new pix_icon('i/badge', get_string('coursebadges', 'badges')));
 406
 407         $url = new moodle_url('/badges/index.php', array('type' => BADGE_TYPE_COURSE, 'id' => $course->id));
 408
 409         $coursenode->get('coursebadges')->add(get_string('managebadges', 'badges'), $url,
 410             navigation_node::TYPE_SETTING, null, 'coursebadges');
 411
 412         if (has_capability('moodle/badges:createbadge', $coursecontext)) {
 413             $url = new moodle_url('/badges/newbadge.php', array('type' => BADGE_TYPE_COURSE, 'id' => $course->id));
 414
 415             $coursenode->get('coursebadges')->add(get_string('newbadge', 'badges'), $url,
 416                     navigation_node::TYPE_SETTING, null, 'newbadge');
 417         }
 418     }
 419 }
 420
 421 /**
 422  * Triggered when badge is manually awarded.
 423  *
 424  * @param   object      $data
 425  * @return  boolean
 426  */
 427 function badges_award_handle_manual_criteria_review(stdClass $data) {
 428     $criteria = $data->crit;
 429     $userid = $data->userid;
 430     $badge = new badge($criteria->badgeid);
 431
 432     if (!$badge->is_active() || $badge->is_issued($userid)) {
 433         return true;
 434     }
 435
 436     if ($criteria->review($userid)) {
 437         $criteria->mark_complete($userid);
 438
 439         if ($badge->criteria[BADGE_CRITERIA_TYPE_OVERALL]->review($userid)) {
 440             $badge->criteria[BADGE_CRITERIA_TYPE_OVERALL]->mark_complete($userid);
 441             $badge->issue($userid);
 442         }
 443     }
 444
 445     return true;
 446 }
 447
 448 /**
 449  * Process badge image from form data
 450  *
 451  * @param badge $badge Badge object
 452  * @param string $iconfile Original file
 453  */
 454 function badges_process_badge_image(badge $badge, $iconfile) {
 455     global $CFG, $USER;
 456     require_once($CFG->libdir. '/gdlib.php');
 457
 458     if (!empty($CFG->gdversion)) {
 459         process_new_icon($badge->get_context(), 'badges', 'badgeimage', $badge->id, $iconfile, true);
 460         @unlink($iconfile);
 461
 462         // Clean up file draft area after badge image has been saved.
 463         $context = context_user::instance($USER->id, MUST_EXIST);
 464         $fs = get_file_storage();
 465         $fs->delete_area_files($context->id, 'user', 'draft');
 466     }
 467 }
 468
 469 /**
 470  * Print badge image.
 471  *
 472  * @param badge $badge Badge object
 473  * @param stdClass $context
 474  * @param string $size
 475  */
 476 function print_badge_image(badge $badge, stdClass $context, $size = 'small') {
 477     $fsize = ($size == 'small') ? 'f2' : 'f1';
 478
 479     $imageurl = moodle_url::make_pluginfile_url($context->id, 'badges', 'badgeimage', $badge->id, '/', $fsize, false);
 480     // Appending a random parameter to image link to forse browser reload the image.
 481     $imageurl->param('refresh', rand(1, 10000));
 482     $attributes = array('src' => $imageurl, 'alt' => s($badge->name), 'class' => 'activatebadge');
 483
 484     return html_writer::empty_tag('img', $attributes);
 485 }
 486
 487 /**
 488  * Bake issued badge.
 489  *
 490  * @param string $hash Unique hash of an issued badge.
 491  * @param int $badgeid ID of the original badge.
 492  * @param int $userid ID of badge recipient (optional).
 493  * @param boolean $pathhash Return file pathhash instead of image url (optional).
 494  * @return string|url Returns either new file path hash or new file URL
 495  */
 496 function badges_bake($hash, $badgeid, $userid = 0, $pathhash = false) {
 497     global $CFG, $USER;
 498     require_once(__DIR__ . '/../badges/lib/bakerlib.php');
 499
 500     $badge = new badge($badgeid);
 501     $badge_context = $badge->get_context();
 502     $userid = ($userid) ? $userid : $USER->id;
 503     $user_context = context_user::instance($userid);
 504
 505     $fs = get_file_storage();
 506     if (!$fs->file_exists($user_context->id, 'badges', 'userbadge', $badge->id, '/', $hash . '.png')) {
 507         if ($file = $fs->get_file($badge_context->id, 'badges', 'badgeimage', $badge->id, '/', 'f3.png')) {
 508             $contents = $file->get_content();
 509
 510             $filehandler = new PNG_MetaDataHandler($contents);
 511             // For now, the site backpack OB version will be used as default.
 512             $obversion = badges_open_badges_backpack_api();
 513             $assertion = new core_badges_assertion($hash, $obversion);
 514             $assertionjson = json_encode($assertion->get_badge_assertion());
 515             if ($filehandler->check_chunks("iTXt", "openbadges")) {
 516                 // Add assertion URL iTXt chunk.
 517                 $newcontents = $filehandler->add_chunks("iTXt", "openbadges", $assertionjson);
 518                 $fileinfo = array(
 519                         'contextid' => $user_context->id,
 520                         'component' => 'badges',
 521                         'filearea' => 'userbadge',
 522                         'itemid' => $badge->id,
 523                         'filepath' => '/',
 524                         'filename' => $hash . '.png',
 525                 );
 526
 527                 // Create a file with added contents.
 528                 $newfile = $fs->create_file_from_string($fileinfo, $newcontents);
 529                 if ($pathhash) {
 530                     return $newfile->get_pathnamehash();
 531                 }
 532             }
 533         } else {
 534             debugging('Error baking badge image!', DEBUG_DEVELOPER);
 535             return;
 536         }
 537     }
 538
 539     // If file exists and we just need its path hash, return it.
 540     if ($pathhash) {
 541         $file = $fs->get_file($user_context->id, 'badges', 'userbadge', $badge->id, '/', $hash . '.png');
 542         return $file->get_pathnamehash();
 543     }
 544
 545     $fileurl = moodle_url::make_pluginfile_url($user_context->id, 'badges', 'userbadge', $badge->id, '/', $hash, true);
 546     return $fileurl;
 547 }
 548
 549 /**
 550  * Returns external backpack settings and badges from this backpack.
 551  *
 552  * This function first checks if badges for the user are cached and
 553  * tries to retrieve them from the cache. Otherwise, badges are obtained
 554  * through curl request to the backpack.
 555  *
 556  * @param int $userid Backpack user ID.
 557  * @param boolean $refresh Refresh badges collection in cache.
 558  * @return null|object Returns null is there is no backpack or object with backpack settings.
 559  */
 560 function get_backpack_settings($userid, $refresh = false) {
 561     global $DB;
 562
 563     // Try to get badges from cache first.
 564     $badgescache = cache::make('core', 'externalbadges');
 565     $out = $badgescache->get($userid);
 566     if ($out !== false && !$refresh) {
 567         return $out;
 568     }
 569     // Get badges through curl request to the backpack.
 570     $record = $DB->get_record('badge_backpack', array('userid' => $userid));
 571     if ($record) {
 572         $sitebackpack = badges_get_site_backpack($record->externalbackpackid);
 573         $backpack = new \core_badges\backpack_api($sitebackpack, $record);
 574         $out = new stdClass();
 575         $out->backpackid = $sitebackpack->id;
 576
 577         if ($collections = $DB->get_records('badge_external', array('backpackid' => $record->id))) {
 578             $out->totalcollections = count($collections);
 579             $out->totalbadges = 0;
 580             $out->badges = array();
 581             foreach ($collections as $collection) {
 582                 $badges = $backpack->get_badges($collection, true);
 583                 if (!empty($badges)) {
 584                     $out->badges = array_merge($out->badges, $badges);
 585                     $out->totalbadges += count($badges);
 586                 } else {
 587                     $out->badges = array_merge($out->badges, array());
 588                 }
 589             }
 590         } else {
 591             $out->totalbadges = 0;
 592             $out->totalcollections = 0;
 593         }
 594
 595         $badgescache->set($userid, $out);
 596         return $out;
 597     }
 598
 599     return null;
 600 }
 601
 602 /**
 603  * Download all user badges in zip archive.
 604  *
 605  * @param int $userid ID of badge owner.
 606  */
 607 function badges_download($userid) {
 608     global $CFG, $DB;
 609     $context = context_user::instance($userid);
 610     $records = $DB->get_records('badge_issued', array('userid' => $userid));
 611
 612     // Get list of files to download.
 613     $fs = get_file_storage();
 614     $filelist = array();
 615     foreach ($records as $issued) {
 616         $badge = new badge($issued->badgeid);
 617         // Need to make image name user-readable and unique using filename safe characters.
 618         $name =  $badge->name . ' ' . userdate($issued->dateissued, '%d %b %Y') . ' ' . hash('crc32', $badge->id);
 619         $name = str_replace(' ', '_', $name);
 620         $name = clean_param($name, PARAM_FILE);
 621         if ($file = $fs->get_file($context->id, 'badges', 'userbadge', $issued->badgeid, '/', $issued->uniquehash . '.png')) {
 622             $filelist[$name . '.png'] = $file;
 623         }
 624     }
 625
 626     // Zip files and sent them to a user.
 627     $tempzip = tempnam($CFG->tempdir.'/', 'mybadges');
 628     $zipper = new zip_packer();
 629     if ($zipper->archive_to_pathname($filelist, $tempzip)) {
 630         send_temp_file($tempzip, 'badges.zip');
 631     } else {
 632         debugging("Problems with archiving the files.", DEBUG_DEVELOPER);
 633         die;
 634     }
 635 }
 636
 637 /**
 638  * Checks if badges can be pushed to external backpack.
 639  *
 640  * @return string Code of backpack accessibility status.
 641  */
 642 function badges_check_backpack_accessibility() {
 643     if (defined('BEHAT_SITE_RUNNING') && BEHAT_SITE_RUNNING) {
 644         // For behat sites, do not poll the remote badge site.
 645         // Behat sites should not be available, but we should pretend as though they are.
 646         return 'available';
 647     }
 648
 649     if (badges_open_badges_backpack_api() == OPEN_BADGES_V2) {
 650         return 'available';
 651     }
 652
 653     global $CFG;
 654     include_once $CFG->libdir . '/filelib.php';
 655
 656     // Using fake assertion url to check whether backpack can access the web site.
 657     $fakeassertion = new moodle_url('/badges/assertion.php', array('b' => 'abcd1234567890'));
 658
 659     // Curl request to backpack baker.
 660     $curl = new curl();
 661     $options = array(
 662         'FRESH_CONNECT' => true,
 663         'RETURNTRANSFER' => true,
 664         'HEADER' => 0,
 665         'CONNECTTIMEOUT' => 2,
 666     );
 667     // BADGE_BACKPACKURL and the "baker" API is deprecated and should never be used in future.
 668     $location = BADGE_BACKPACKURL . '/baker';
 669     $out = $curl->get($location, array('assertion' => $fakeassertion->out(false)), $options);
 670
 671     $data = json_decode($out);
 672     if (!empty($curl->error)) {
 673         return 'curl-request-timeout';
 674     } else {
 675         if (isset($data->code) && $data->code == 'http-unreachable') {
 676             return 'http-unreachable';
 677         } else {
 678             return 'available';
 679         }
 680     }
 681
 682     return false;
 683 }
 684
 685 /**
 686  * Checks if user has external backpack connected.
 687  *
 688  * @param int $userid ID of a user.
 689  * @return bool True|False whether backpack connection exists.
 690  */
 691 function badges_user_has_backpack($userid) {
 692     global $DB;
 693     return $DB->record_exists('badge_backpack', array('userid' => $userid));
 694 }
 695
 696 /**
 697  * Handles what happens to the course badges when a course is deleted.
 698  *
 699  * @param int $courseid course ID.
 700  * @return void.
 701  */
 702 function badges_handle_course_deletion($courseid) {
 703     global $CFG, $DB;
 704     include_once $CFG->libdir . '/filelib.php';
 705
 706     $systemcontext = context_system::instance();
 707     $coursecontext = context_course::instance($courseid);
 708     $fs = get_file_storage();
 709
 710     // Move badges images to the system context.
 711     $fs->move_area_files_to_new_context($coursecontext->id, $systemcontext->id, 'badges', 'badgeimage');
 712
 713     // Get all course badges.
 714     $badges = $DB->get_records('badge', array('type' => BADGE_TYPE_COURSE, 'courseid' => $courseid));
 715     foreach ($badges as $badge) {
 716         // Archive badges in this course.
 717         $toupdate = new stdClass();
 718         $toupdate->id = $badge->id;
 719         $toupdate->type = BADGE_TYPE_SITE;
 720         $toupdate->courseid = null;
 721         $toupdate->status = BADGE_STATUS_ARCHIVED;
 722         $DB->update_record('badge', $toupdate);
 723     }
 724 }
 725
 726 /**
 727  * Loads JS files required for backpack support.
 728  *
 729  * @uses   $CFG, $PAGE
 730  * @return void
 731  */
 732 function badges_setup_backpack_js() {
 733     global $CFG, $PAGE;
 734     if (!empty($CFG->badges_allowexternalbackpack)) {
 735         if (badges_open_badges_backpack_api() == OPEN_BADGES_V1) {
 736             $PAGE->requires->string_for_js('error:backpackproblem', 'badges');
 737             // The issuer.js API is deprecated and should not be used in future.
 738             $PAGE->requires->js(new moodle_url(BADGE_BACKPACKURL . '/issuer.js'), true);
 739             // The backpack.js file is deprecated and should not be used in future.
 740             $PAGE->requires->js('/badges/backpack.js', true);
 741         }
 742     }
 743 }
 744
 745 /**
 746  * No js files are required for backpack support.
 747  * This only exists to directly support the custom V1 backpack api.
 748  *
 749  * @param boolean $checksite Call check site function.
 750  * @return void
 751  */
 752 function badges_local_backpack_js($checksite = false) {
 753     global $CFG, $PAGE;
 754     if (!empty($CFG->badges_allowexternalbackpack)) {
 755         if (badges_open_badges_backpack_api() == OPEN_BADGES_V1) {
 756             $PAGE->requires->js('/badges/backpack.js', true);
 757             if ($checksite) {
 758                 $PAGE->requires->js_init_call('check_site_access', null, false);
 759             }
 760         }
 761     }
 762 }
 763
 764 /**
 765  * Create the backpack with this data.
 766  *
 767  * @param stdClass $data The new backpack data.
 768  * @return boolean
 769  */
 770 function badges_create_site_backpack($data) {
 771     global $DB;
 772     $context = context_system::instance();
 773     require_capability('moodle/badges:manageglobalsettings', $context);
 774
 775     $count = $DB->count_records('badge_external_backpack');
 776
 777     $backpack = new stdClass();
 778     $backpack->apiversion = $data->apiversion;
 779     $backpack->backpackapiurl = $data->backpackapiurl;
 780     $backpack->backpackweburl = $data->backpackweburl;
 781     $backpack->sortorder = $count;
 782     $DB->insert_record('badge_external_backpack', $backpack);
 783     return true;
 784 }
 785
 786 /**
 787  * Update the backpack with this id.
 788  *
 789  * @param integer $id The backpack to edit
 790  * @param stdClass $data The new backpack data.
 791  * @return boolean
 792  */
 793 function badges_update_site_backpack($id, $data) {
 794     global $DB;
 795     $context = context_system::instance();
 796     require_capability('moodle/badges:manageglobalsettings', $context);
 797
 798     if ($backpack = badges_get_site_backpack($id)) {
 799         $backpack = new stdClass();
 800         $backpack->id = $id;
 801         $backpack->apiversion = $data->apiversion;
 802         $backpack->backpackweburl = $data->backpackweburl;
 803         $backpack->backpackapiurl = $data->backpackapiurl;
 804         $backpack->password = !empty($data->password) ? $data->password : '';
 805         $backpack->oauth2_issuerid = !empty($data->oauth2_issuerid) ? $data->oauth2_issuerid : '';
 806         $DB->update_record('badge_external_backpack', $backpack);
 807         return true;
 808     }
 809     return false;
 810 }
 811
 812
 813 /**
 814  * Delete the backpack with this id.
 815  *
 816  * @param integer $id The backpack to delete.
 817  * @return boolean
 818  */
 819 function badges_delete_site_backpack($id) {
 820     global $DB, $CFG;
 821
 822     $context = context_system::instance();
 823     require_capability('moodle/badges:manageglobalsettings', $context);
 824
 825     // Only remove site backpack if it's not the default one.
 826     if ($CFG->badges_site_backpack != $id && $DB->record_exists('badge_external_backpack', ['id' => $id])) {
 827         $transaction = $DB->start_delegated_transaction();
 828
 829         // Remove connections for users to this backpack.
 830         $sql = "SELECT DISTINCT bb.id
 831                   FROM {badge_backpack} bb
 832                  WHERE bb.externalbackpackid = :backpackid";
 833         $params = ['backpackid' => $id];
 834         $userbackpacks = $DB->get_fieldset_sql($sql, $params);
 835         if ($userbackpacks) {
 836             // Delete user external collections references to this backpack.
 837             list($insql, $params) = $DB->get_in_or_equal($userbackpacks);
 838             $DB->delete_records_select('badge_external', "backpackid $insql", $params);
 839         }
 840         $DB->delete_records('badge_backpack', ['externalbackpackid' => $id]);
 841
 842         // Delete backpack entry.
 843         $result = $DB->delete_records('badge_external_backpack', ['id' => $id]);
 844
 845         $transaction->allow_commit();
 846
 847         return $result;
 848     }
 849
 850     return false;
 851 }
 852
 853 /**
 854  * Is any backpack enabled that supports open badges V1?
 855  * @return boolean
 856  */
 857 function badges_open_badges_backpack_api() {
 858     global $CFG;
 859
 860     $backpack = badges_get_site_backpack($CFG->badges_site_backpack);
 861     if (empty($backpack->apiversion)) {
 862         return OPEN_BADGES_V2;
 863     }
 864     return $backpack->apiversion;
 865 }
 866
 867 /**
 868  * Get a site backpacks by id or url.
 869  *
 870  * @param int $id The backpack id.
 871  * @return array(stdClass)
 872  */
 873 function badges_get_site_backpack($id) {
 874     global $DB;
 875
 876     return $DB->get_record('badge_external_backpack', ['id' => $id]);
 877 }
 878
 879 /**
 880  * List the backpacks at site level.
 881  *
 882  * @return array(stdClass)
 883  */
 884 function badges_get_site_backpacks() {
 885     global $DB, $CFG;
 886
 887     $all = $DB->get_records('badge_external_backpack');
 888
 889     foreach ($all as $key => $bp) {
 890         if ($bp->id == $CFG->badges_site_backpack) {
 891             $all[$key]->sitebackpack = true;
 892         } else {
 893             $all[$key]->sitebackpack = false;
 894         }
 895     }
 896     return $all;
 897 }
 898
 899 /**
 900  * List the supported badges api versions.
 901  *
 902  * @return array(version)
 903  */
 904 function badges_get_badge_api_versions() {
 905     return [
 906         (string)OPEN_BADGES_V1 => get_string('openbadgesv1', 'badges'),
 907         (string)OPEN_BADGES_V2 => get_string('openbadgesv2', 'badges'),
 908         (string)OPEN_BADGES_V2P1 => get_string('openbadgesv2p1', 'badges')
 909     ];
 910 }
 911
 912 /**
 913  * Get the default issuer for a badge from this site.
 914  *
 915  * @return array
 916  */
 917 function badges_get_default_issuer() {
 918     global $CFG, $SITE;
 919
 920     $issuer = array();
 921     $issuerurl = new moodle_url('/');
 922     $issuer['name'] = $CFG->badges_defaultissuername;
 923     if (empty($issuer['name'])) {
 924         $issuer['name'] = $SITE->fullname ? $SITE->fullname : $SITE->shortname;
 925     }
 926     $issuer['url'] = $issuerurl->out(false);
 927     $issuer['email'] = $CFG->badges_defaultissuercontact;
 928     $issuer['@context'] = OPEN_BADGES_V2_CONTEXT;
 929     $issuerid = new moodle_url('/badges/issuer_json.php');
 930     $issuer['id'] = $issuerid->out(false);
 931     $issuer['type'] = OPEN_BADGES_V2_TYPE_ISSUER;
 932     return $issuer;
 933 }
 934
 935 /**
 936  * Disconnect from the user backpack by deleting the user preferences.
 937  *
 938  * @param integer $userid The user to diconnect.
 939  * @return boolean
 940  */
 941 function badges_disconnect_user_backpack($userid) {
 942     global $USER;
 943
 944     // We can only change backpack settings for our own real backpack.
 945     if ($USER->id != $userid ||
 946             \core\session\manager::is_loggedinas()) {
 947
 948         return false;
 949     }
 950
 951     unset_user_preference('badges_email_verify_secret');
 952     unset_user_preference('badges_email_verify_address');
 953     unset_user_preference('badges_email_verify_backpackid');
 954     unset_user_preference('badges_email_verify_password');
 955
 956     return true;
 957 }
 958
 959 /**
 960  * Used to remember which objects we connected with a backpack before.
 961  *
 962  * @param integer $sitebackpackid The site backpack to connect to.
 963  * @param string $type The type of this remote object.
 964  * @param string $internalid The id for this object on the Moodle site.
 965  * @return mixed The id or false if it doesn't exist.
 966  */
 967 function badges_external_get_mapping($sitebackpackid, $type, $internalid) {
 968     global $DB;
 969     // Return externalid if it exists.
 970     $params = [
 971         'sitebackpackid' => $sitebackpackid,
 972         'type' => $type,
 973         'internalid' => $internalid
 974     ];
 975
 976     $record = $DB->get_record('badge_external_identifier', $params, 'externalid', IGNORE_MISSING);
 977     if ($record) {
 978         return $record->externalid;
 979     }
 980     return false;
 981 }
 982
 983 /**
 984  * Save the info about which objects we connected with a backpack before.
 985  *
 986  * @param integer $sitebackpackid The site backpack to connect to.
 987  * @param string $type The type of this remote object.
 988  * @param string $internalid The id for this object on the Moodle site.
 989  * @param string $externalid The id of this object on the remote site.
 990  * @return boolean
 991  */
 992 function badges_external_create_mapping($sitebackpackid, $type, $internalid, $externalid) {
 993     global $DB;
 994
 995     $params = [
 996         'sitebackpackid' => $sitebackpackid,
 997         'type' => $type,
 998         'internalid' => $internalid,
 999         'externalid' => $externalid
1000     ];
1001
1002     return $DB->insert_record('badge_external_identifier', $params);
1003 }
1004
1005 /**
1006  * Delete all external mapping information for a backpack.
1007  *
1008  * @param integer $sitebackpackid The site backpack to connect to.
1009  * @return boolean
1010  */
1011 function badges_external_delete_mappings($sitebackpackid) {
1012     global $DB;
1013
1014     $params = ['sitebackpackid' => $sitebackpackid];
1015
1016     return $DB->delete_records('badge_external_identifier', $params);
1017 }
1018
1019 /**
1020  * Delete a specific external mapping information for a backpack.
1021  *
1022  * @param integer $sitebackpackid The site backpack to connect to.
1023  * @param string $type The type of this remote object.
1024  * @param string $internalid The id for this object on the Moodle site.
1025  * @return boolean
1026  */
1027 function badges_external_delete_mapping($sitebackpackid, $type, $internalid) {
1028     global $DB;
1029
1030     $params = [
1031         'sitebackpackid' => $sitebackpackid,
1032         'type' => $type,
1033         'internalid' => $internalid
1034     ];
1035
1036     $DB->delete_record('badge_external_identifier', $params);
1037 }
1038
1039 /**
1040  * Create and send a verification email to the email address supplied.
1041  *
1042  * Since we're not sending this email to a user, email_to_user can't be used
1043  * but this function borrows largely the code from that process.
1044  *
1045  * @param string $email the email address to send the verification email to.
1046  * @param int $backpackid the id of the backpack to connect to
1047  * @param string $backpackpassword the user entered password to connect to this backpack
1048  * @return true if the email was sent successfully, false otherwise.
1049  */
1050 function badges_send_verification_email($email, $backpackid, $backpackpassword) {
1051     global $DB, $USER;
1052
1053     // Store a user secret (badges_email_verify_secret) and the address (badges_email_verify_address) as users prefs.
1054     // The address will be used by edit_backpack_form for display during verification and to facilitate the resending
1055     // of verification emails to said address.
1056     $secret = random_string(15);
1057     set_user_preference('badges_email_verify_secret', $secret);
1058     set_user_preference('badges_email_verify_address', $email);
1059     set_user_preference('badges_email_verify_backpackid', $backpackid);
1060     set_user_preference('badges_email_verify_password', $backpackpassword);
1061
1062     // To, from.
1063     $tempuser = $DB->get_record('user', array('id' => $USER->id), '*', MUST_EXIST);
1064     $tempuser->email = $email;
1065     $noreplyuser = core_user::get_noreply_user();
1066
1067     // Generate the verification email body.
1068     $verificationurl = '/badges/backpackemailverify.php';
1069     $verificationurl = new moodle_url($verificationurl);
1070     $verificationpath = $verificationurl->out(false);
1071
1072     $site = get_site();
1073     $args = new stdClass();
1074     $args->link = $verificationpath . '?data='. $secret;
1075     $args->sitename = $site->fullname;
1076     $args->admin = generate_email_signoff();
1077
1078     $messagesubject = get_string('backpackemailverifyemailsubject', 'badges', $site->fullname);
1079     $messagetext = get_string('backpackemailverifyemailbody', 'badges', $args);
1080     $messagehtml = text_to_html($messagetext, false, false, true);
1081
1082     return email_to_user($tempuser, $noreplyuser, $messagesubject, $messagetext, $messagehtml);
1083 }
1084
1085 /**
1086  * Return all the enabled criteria types for this site.
1087  *
1088  * @param boolean $enabled
1089  * @return array
1090  */
1091 function badges_list_criteria($enabled = true) {
1092     global $CFG;
1093
1094     $types = array(
1095         BADGE_CRITERIA_TYPE_OVERALL    => 'overall',
1096         BADGE_CRITERIA_TYPE_ACTIVITY   => 'activity',
1097         BADGE_CRITERIA_TYPE_MANUAL     => 'manual',
1098         BADGE_CRITERIA_TYPE_SOCIAL     => 'social',
1099         BADGE_CRITERIA_TYPE_COURSE     => 'course',
1100         BADGE_CRITERIA_TYPE_COURSESET  => 'courseset',
1101         BADGE_CRITERIA_TYPE_PROFILE    => 'profile',
1102         BADGE_CRITERIA_TYPE_BADGE      => 'badge',
1103         BADGE_CRITERIA_TYPE_COHORT     => 'cohort',
1104         BADGE_CRITERIA_TYPE_COMPETENCY => 'competency',
1105     );
1106     if ($enabled) {
1107         foreach ($types as $key => $type) {
1108             $class = 'award_criteria_' . $type;
1109             $file = $CFG->dirroot . '/badges/criteria/' . $class . '.php';
1110             if (file_exists($file)) {
1111                 require_once($file);
1112
1113                 if (!$class::is_enabled()) {
1114                     unset($types[$key]);
1115                 }
1116             }
1117         }
1118     }
1119     return $types;
1120 }
1121
1122 /**
1123  * Check if any badge has records for competencies.
1124  *
1125  * @param array $competencyids Array of competencies ids.
1126  * @return boolean Return true if competencies were found in any badge.
1127  */
1128 function badge_award_criteria_competency_has_records_for_competencies($competencyids) {
1129     global $DB;
1130
1131     list($insql, $params) = $DB->get_in_or_equal($competencyids, SQL_PARAMS_NAMED);
1132
1133     $sql = "SELECT DISTINCT bc.badgeid
1134                 FROM {badge_criteria} bc
1135                 JOIN {badge_criteria_param} bcp ON bc.id = bcp.critid
1136                 WHERE bc.criteriatype = :criteriatype AND bcp.value $insql";
1137     $params['criteriatype'] = BADGE_CRITERIA_TYPE_COMPETENCY;
1138
1139     return $DB->record_exists_sql($sql, $params);
1140 }
1141
1142 /**
1143  * Creates single message for all notification and sends it out
1144  *
1145  * @param object $badge A badge which is notified about.
1146  */
1147 function badge_assemble_notification(stdClass $badge) {
1148     global $DB;
1149
1150     $userfrom = core_user::get_noreply_user();
1151     $userfrom->maildisplay = true;
1152
1153     if ($msgs = $DB->get_records_select('badge_issued', 'issuernotified IS NULL AND badgeid = ?', array($badge->id))) {
1154         // Get badge creator.
1155         $creator = $DB->get_record('user', array('id' => $badge->creator), '*', MUST_EXIST);
1156         $creatorsubject = get_string('creatorsubject', 'badges', $badge->name);
1157         $creatormessage = '';
1158
1159         // Put all messages in one digest.
1160         foreach ($msgs as $msg) {
1161             $issuedlink = html_writer::link(new moodle_url('/badges/badge.php', array('hash' => $msg->uniquehash)), $badge->name);
1162             $recipient = $DB->get_record('user', array('id' => $msg->userid), '*', MUST_EXIST);
1163
1164             $a = new stdClass();
1165             $a->user = fullname($recipient);
1166             $a->link = $issuedlink;
1167             $creatormessage .= get_string('creatorbody', 'badges', $a);
1168             $DB->set_field('badge_issued', 'issuernotified', time(), array('badgeid' => $msg->badgeid, 'userid' => $msg->userid));
1169         }
1170
1171         // Create a message object.
1172         $eventdata = new \core\message\message();
1173         $eventdata->courseid          = SITEID;
1174         $eventdata->component         = 'moodle';
1175         $eventdata->name              = 'badgecreatornotice';
1176         $eventdata->userfrom          = $userfrom;
1177         $eventdata->userto            = $creator;
1178         $eventdata->notification      = 1;
1179         $eventdata->subject           = $creatorsubject;
1180         $eventdata->fullmessage       = format_text_email($creatormessage, FORMAT_HTML);
1181         $eventdata->fullmessageformat = FORMAT_PLAIN;
1182         $eventdata->fullmessagehtml   = $creatormessage;
1183         $eventdata->smallmessage      = $creatorsubject;
1184
1185         message_send($eventdata);
1186     }
1187 }
1188
1189 /**
1190  * Attempt to authenticate with the site backpack credentials and return an error
1191  * if the authentication fails. If external backpacks are not enabled, this will
1192  * not perform any test.
1193  *
1194  * @return string
1195  */
1196 function badges_verify_site_backpack() {
1197     global $CFG;
1198
1199     return badges_verify_backpack($CFG->badges_site_backpack);
1200 }
1201
1202 /**
1203  * Attempt to authenticate with a backpack credentials and return an error
1204  * if the authentication fails.
1205  * If external backpacks are not enabled or the backpack version is different
1206  * from OBv2, this will not perform any test.
1207  *
1208  * @param int $backpackid Backpack identifier to verify.
1209  * @return string The result of the verification process.
1210  */
1211 function badges_verify_backpack(int $backpackid) {
1212     global $OUTPUT, $CFG;
1213
1214     if (empty($CFG->badges_allowexternalbackpack)) {
1215         return '';
1216     }
1217
1218     $backpack = badges_get_site_backpack($backpackid);
1219     if (empty($backpack->apiversion) || ($backpack->apiversion == OPEN_BADGES_V2)) {
1220         $backpackapi = new \core_badges\backpack_api($backpack);
1221
1222         // Clear any cached access tokens in the session.
1223         $backpackapi->clear_system_user_session();
1224
1225         // Now attempt a login with these credentials.
1226         $result = $backpackapi->authenticate();
1227         if (empty($result) || !empty($result->error)) {
1228             $warning = $backpackapi->get_authentication_error();
1229
1230             $params = ['id' => $backpack->id, 'action' => 'edit'];
1231             $backpackurl = (new moodle_url('/badges/backpacks.php', $params))->out(false);
1232
1233             $message = get_string('sitebackpackwarning', 'badges', ['url' => $backpackurl, 'warning' => $warning]);
1234             $icon = $OUTPUT->pix_icon('i/warning', get_string('warning', 'moodle'));
1235             return $OUTPUT->container($icon . $message, 'text-error');
1236         }
1237     }
1238
1239     return '';
1240 }
1241
1242 /**
1243  * Get OAuth2 services for the external backpack.
1244  *
1245  * @return array
1246  * @throws coding_exception
1247  */
1248 function badges_get_oauth2_service_options() {
1249     global $DB;
1250
1251     $issuers = core\oauth2\api::get_all_issuers();
1252     $options = ['' => 'None'];
1253     foreach ($issuers as $issuer) {
1254         $options[$issuer->get('id')] = $issuer->get('name');
1255     }
1256
1257     return $options;
1258 }