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. Currently only the Open Badges backpack is supported.
  98  */
  99 define('BADGE_BACKPACKURL', 'https://backpack.openbadges.org');
 100
 101 /**
 102  * Class that represents badge.
 103  *
 104  */
 105 class badge {
 106     /** @var int Badge id */
 107     public $id;
 108
 109     /** Values from the table 'badge' */
 110     public $name;
 111     public $description;
 112     public $timecreated;
 113     public $timemodified;
 114     public $usercreated;
 115     public $usermodified;
 116     public $issuername;
 117     public $issuerurl;
 118     public $issuercontact;
 119     public $expiredate;
 120     public $expireperiod;
 121     public $type;
 122     public $courseid;
 123     public $message;
 124     public $messagesubject;
 125     public $attachment;
 126     public $notification;
 127     public $status = 0;
 128     public $nextcron;
 129
 130     /** @var array Badge criteria */
 131     public $criteria = array();
 132
 133     /**
 134      * Constructs with badge details.
 135      *
 136      * @param int $badgeid badge ID.
 137      */
 138     public function __construct($badgeid) {
 139         global $DB;
 140         $this->id = $badgeid;
 141
 142         $data = $DB->get_record('badge', array('id' => $badgeid));
 143
 144         if (empty($data)) {
 145             print_error('error:nosuchbadge', 'badges', $badgeid);
 146         }
 147
 148         foreach ((array)$data as $field => $value) {
 149             if (property_exists($this, $field)) {
 150                 $this->{$field} = $value;
 151             }
 152         }
 153
 154         $this->criteria = self::get_criteria();
 155     }
 156
 157     /**
 158      * Use to get context instance of a badge.
 159      * @return context instance.
 160      */
 161     public function get_context() {
 162         if ($this->type == BADGE_TYPE_SITE) {
 163             return context_system::instance();
 164         } else if ($this->type == BADGE_TYPE_COURSE) {
 165             return context_course::instance($this->courseid);
 166         } else {
 167             debugging('Something is wrong...');
 168         }
 169     }
 170
 171     /**
 172      * Return array of aggregation methods
 173      * @return array
 174      */
 175     public static function get_aggregation_methods() {
 176         return array(
 177                 BADGE_CRITERIA_AGGREGATION_ALL => get_string('all', 'badges'),
 178                 BADGE_CRITERIA_AGGREGATION_ANY => get_string('any', 'badges'),
 179         );
 180     }
 181
 182     /**
 183      * Return array of accepted criteria types for this badge
 184      * @return array
 185      */
 186     public function get_accepted_criteria() {
 187         $criteriatypes = array();
 188
 189         if ($this->type == BADGE_TYPE_COURSE) {
 190             $criteriatypes = array(
 191                     BADGE_CRITERIA_TYPE_OVERALL,
 192                     BADGE_CRITERIA_TYPE_MANUAL,
 193                     BADGE_CRITERIA_TYPE_COURSE,
 194                     BADGE_CRITERIA_TYPE_ACTIVITY
 195             );
 196         } else if ($this->type == BADGE_TYPE_SITE) {
 197             $criteriatypes = array(
 198                     BADGE_CRITERIA_TYPE_OVERALL,
 199                     BADGE_CRITERIA_TYPE_MANUAL,
 200                     BADGE_CRITERIA_TYPE_COURSESET,
 201                     BADGE_CRITERIA_TYPE_PROFILE,
 202             );
 203         }
 204
 205         return $criteriatypes;
 206     }
 207
 208     /**
 209      * Save/update badge information in 'badge' table only.
 210      * Cannot be used for updating awards and criteria settings.
 211      *
 212      * @return bool Returns true on success.
 213      */
 214     public function save() {
 215         global $DB;
 216
 217         $fordb = new stdClass();
 218         foreach (get_object_vars($this) as $k => $v) {
 219             $fordb->{$k} = $v;
 220         }
 221         unset($fordb->criteria);
 222
 223         $fordb->timemodified = time();
 224         if ($DB->update_record_raw('badge', $fordb)) {
 225             // Trigger event, badge updated.
 226             $eventparams = array('objectid' => $this->id, 'context' => $this->get_context());
 227             $event = \core\event\badge_updated::create($eventparams);
 228             $event->trigger();
 229             return true;
 230         } else {
 231             throw new moodle_exception('error:save', 'badges');
 232             return false;
 233         }
 234     }
 235
 236     /**
 237      * Creates and saves a clone of badge with all its properties.
 238      * Clone is not active by default and has 'Copy of' attached to its name.
 239      *
 240      * @return int ID of new badge.
 241      */
 242     public function make_clone() {
 243         global $DB, $USER, $PAGE;
 244
 245         $fordb = new stdClass();
 246         foreach (get_object_vars($this) as $k => $v) {
 247             $fordb->{$k} = $v;
 248         }
 249
 250         $fordb->name = get_string('copyof', 'badges', $this->name);
 251         $fordb->status = BADGE_STATUS_INACTIVE;
 252         $fordb->usercreated = $USER->id;
 253         $fordb->usermodified = $USER->id;
 254         $fordb->timecreated = time();
 255         $fordb->timemodified = time();
 256         unset($fordb->id);
 257
 258         if ($fordb->notification > 1) {
 259             $fordb->nextcron = badges_calculate_message_schedule($fordb->notification);
 260         }
 261
 262         $criteria = $fordb->criteria;
 263         unset($fordb->criteria);
 264
 265         if ($new = $DB->insert_record('badge', $fordb, true)) {
 266             $newbadge = new badge($new);
 267
 268             // Copy badge image.
 269             $fs = get_file_storage();
 270             if ($file = $fs->get_file($this->get_context()->id, 'badges', 'badgeimage', $this->id, '/', 'f1.png')) {
 271                 if ($imagefile = $file->copy_content_to_temp()) {
 272                     badges_process_badge_image($newbadge, $imagefile);
 273                 }
 274             }
 275
 276             // Copy badge criteria.
 277             foreach ($this->criteria as $crit) {
 278                 $crit->make_clone($new);
 279             }
 280
 281             // Trigger event, badge duplicated.
 282             $eventparams = array('objectid' => $new, 'context' => $PAGE->context);
 283             $event = \core\event\badge_duplicated::create($eventparams);
 284             $event->trigger();
 285
 286             return $new;
 287         } else {
 288             throw new moodle_exception('error:clone', 'badges');
 289             return false;
 290         }
 291     }
 292
 293     /**
 294      * Checks if badges is active.
 295      * Used in badge award.
 296      *
 297      * @return bool A status indicating badge is active
 298      */
 299     public function is_active() {
 300         if (($this->status == BADGE_STATUS_ACTIVE) ||
 301             ($this->status == BADGE_STATUS_ACTIVE_LOCKED)) {
 302             return true;
 303         }
 304         return false;
 305     }
 306
 307     /**
 308      * Use to get the name of badge status.
 309      *
 310      */
 311     public function get_status_name() {
 312         return get_string('badgestatus_' . $this->status, 'badges');
 313     }
 314
 315     /**
 316      * Use to set badge status.
 317      * Only active badges can be earned/awarded/issued.
 318      *
 319      * @param int $status Status from BADGE_STATUS constants
 320      */
 321     public function set_status($status = 0) {
 322         $this->status = $status;
 323         $this->save();
 324         if ($status == BADGE_STATUS_ACTIVE) {
 325             // Trigger event, badge enabled.
 326             $eventparams = array('objectid' => $this->id, 'context' => $this->get_context());
 327             $event = \core\event\badge_enabled::create($eventparams);
 328             $event->trigger();
 329         } else if ($status == BADGE_STATUS_INACTIVE) {
 330             // Trigger event, badge disabled.
 331             $eventparams = array('objectid' => $this->id, 'context' => $this->get_context());
 332             $event = \core\event\badge_disabled::create($eventparams);
 333             $event->trigger();
 334         }
 335     }
 336
 337     /**
 338      * Checks if badges is locked.
 339      * Used in badge award and editing.
 340      *
 341      * @return bool A status indicating badge is locked
 342      */
 343     public function is_locked() {
 344         if (($this->status == BADGE_STATUS_ACTIVE_LOCKED) ||
 345                 ($this->status == BADGE_STATUS_INACTIVE_LOCKED)) {
 346             return true;
 347         }
 348         return false;
 349     }
 350
 351     /**
 352      * Checks if badge has been awarded to users.
 353      * Used in badge editing.
 354      *
 355      * @return bool A status indicating badge has been awarded at least once
 356      */
 357     public function has_awards() {
 358         global $DB;
 359         $awarded = $DB->record_exists_sql('SELECT b.uniquehash
 360                     FROM {badge_issued} b INNER JOIN {user} u ON b.userid = u.id
 361                     WHERE b.badgeid = :badgeid AND u.deleted = 0', array('badgeid' => $this->id));
 362
 363         return $awarded;
 364     }
 365
 366     /**
 367      * Gets list of users who have earned an instance of this badge.
 368      *
 369      * @return array An array of objects with information about badge awards.
 370      */
 371     public function get_awards() {
 372         global $DB;
 373
 374         $awards = $DB->get_records_sql(
 375                 'SELECT b.userid, b.dateissued, b.uniquehash, u.firstname, u.lastname
 376                     FROM {badge_issued} b INNER JOIN {user} u
 377                         ON b.userid = u.id
 378                     WHERE b.badgeid = :badgeid AND u.deleted = 0', array('badgeid' => $this->id));
 379
 380         return $awards;
 381     }
 382
 383     /**
 384      * Indicates whether badge has already been issued to a user.
 385      *
 386      */
 387     public function is_issued($userid) {
 388         global $DB;
 389         return $DB->record_exists('badge_issued', array('badgeid' => $this->id, 'userid' => $userid));
 390     }
 391
 392     /**
 393      * Issue a badge to user.
 394      *
 395      * @param int $userid User who earned the badge
 396      * @param bool $nobake Not baking actual badges (for testing purposes)
 397      */
 398     public function issue($userid, $nobake = false) {
 399         global $DB, $CFG;
 400
 401         $now = time();
 402         $issued = new stdClass();
 403         $issued->badgeid = $this->id;
 404         $issued->userid = $userid;
 405         $issued->uniquehash = sha1(rand() . $userid . $this->id . $now);
 406         $issued->dateissued = $now;
 407
 408         if ($this->can_expire()) {
 409             $issued->dateexpire = $this->calculate_expiry($now);
 410         } else {
 411             $issued->dateexpire = null;
 412         }
 413
 414         // Take into account user badges privacy settings.
 415         // If none set, badges default visibility is set to public.
 416         $issued->visible = get_user_preferences('badgeprivacysetting', 1, $userid);
 417
 418         $result = $DB->insert_record('badge_issued', $issued, true);
 419
 420         if ($result) {
 421             // Trigger badge awarded event.
 422             $eventdata = array (
 423                 'context' => $this->get_context(),
 424                 'objectid' => $this->id,
 425                 'relateduserid' => $userid,
 426                 'other' => array('dateexpire' => $issued->dateexpire, 'badgeissuedid' => $result)
 427             );
 428             \core\event\badge_awarded::create($eventdata)->trigger();
 429
 430             // Lock the badge, so that its criteria could not be changed any more.
 431             if ($this->status == BADGE_STATUS_ACTIVE) {
 432                 $this->set_status(BADGE_STATUS_ACTIVE_LOCKED);
 433             }
 434
 435             // Update details in criteria_met table.
 436             $compl = $this->get_criteria_completions($userid);
 437             foreach ($compl as $c) {
 438                 $obj = new stdClass();
 439                 $obj->id = $c->id;
 440                 $obj->issuedid = $result;
 441                 $DB->update_record('badge_criteria_met', $obj, true);
 442             }
 443
 444             if (!$nobake) {
 445                 // Bake a badge image.
 446                 $pathhash = badges_bake($issued->uniquehash, $this->id, $userid, true);
 447
 448                 // Notify recipients and badge creators.
 449                 badges_notify_badge_award($this, $userid, $issued->uniquehash, $pathhash);
 450             }
 451         }
 452     }
 453
 454     /**
 455      * Reviews all badge criteria and checks if badge can be instantly awarded.
 456      *
 457      * @return int Number of awards
 458      */
 459     public function review_all_criteria() {
 460         global $DB, $CFG;
 461         $awards = 0;
 462
 463         // Raise timelimit as this could take a while for big web sites.
 464         core_php_time_limit::raise();
 465         raise_memory_limit(MEMORY_HUGE);
 466
 467         foreach ($this->criteria as $crit) {
 468             // Overall criterion is decided when other criteria are reviewed.
 469             if ($crit->criteriatype == BADGE_CRITERIA_TYPE_OVERALL) {
 470                 continue;
 471             }
 472
 473             list($extrajoin, $extrawhere, $extraparams) = $crit->get_completed_criteria_sql();
 474             // For site level badges, get all active site users who can earn this badge and haven't got it yet.
 475             if ($this->type == BADGE_TYPE_SITE) {
 476                 $sql = "SELECT DISTINCT u.id, bi.badgeid
 477                         FROM {user} u
 478                         {$extrajoin}
 479                         LEFT JOIN {badge_issued} bi
 480                             ON u.id = bi.userid AND bi.badgeid = :badgeid
 481                         WHERE bi.badgeid IS NULL AND u.id != :guestid AND u.deleted = 0 " . $extrawhere;
 482                 $params = array_merge(array('badgeid' => $this->id, 'guestid' => $CFG->siteguest), $extraparams);
 483                 $toearn = $DB->get_fieldset_sql($sql, $params);
 484             } else {
 485                 // For course level badges, get all users who already earned the badge in this course.
 486                 // Then find the ones who are enrolled in the course and don't have a badge yet.
 487                 $earned = $DB->get_fieldset_select('badge_issued', 'userid AS id', 'badgeid = :badgeid', array('badgeid' => $this->id));
 488                 $wheresql = '';
 489                 $earnedparams = array();
 490                 if (!empty($earned)) {
 491                     list($earnedsql, $earnedparams) = $DB->get_in_or_equal($earned, SQL_PARAMS_NAMED, 'u', false);
 492                     $wheresql = ' WHERE u.id ' . $earnedsql;
 493                 }
 494                 list($enrolledsql, $enrolledparams) = get_enrolled_sql($this->get_context(), 'moodle/badges:earnbadge', 0, true);
 495                 $sql = "SELECT DISTINCT u.id
 496                         FROM {user} u
 497                         {$extrajoin}
 498                         JOIN ({$enrolledsql}) je ON je.id = u.id " . $wheresql . $extrawhere;
 499                 $params = array_merge($enrolledparams, $earnedparams, $extraparams);
 500                 $toearn = $DB->get_fieldset_sql($sql, $params);
 501             }
 502
 503             foreach ($toearn as $uid) {
 504                 $reviewoverall = false;
 505                 if ($crit->review($uid, true)) {
 506                     $crit->mark_complete($uid);
 507                     if ($this->criteria[BADGE_CRITERIA_TYPE_OVERALL]->method == BADGE_CRITERIA_AGGREGATION_ANY) {
 508                         $this->criteria[BADGE_CRITERIA_TYPE_OVERALL]->mark_complete($uid);
 509                         $this->issue($uid);
 510                         $awards++;
 511                     } else {
 512                         $reviewoverall = true;
 513                     }
 514                 } else {
 515                     // Will be reviewed some other time.
 516                     $reviewoverall = false;
 517                 }
 518                 // Review overall if it is required.
 519                 if ($reviewoverall && $this->criteria[BADGE_CRITERIA_TYPE_OVERALL]->review($uid)) {
 520                     $this->criteria[BADGE_CRITERIA_TYPE_OVERALL]->mark_complete($uid);
 521                     $this->issue($uid);
 522                     $awards++;
 523                 }
 524             }
 525         }
 526
 527         return $awards;
 528     }
 529
 530     /**
 531      * Gets an array of completed criteria from 'badge_criteria_met' table.
 532      *
 533      * @param int $userid Completions for a user
 534      * @return array Records of criteria completions
 535      */
 536     public function get_criteria_completions($userid) {
 537         global $DB;
 538         $completions = array();
 539         $sql = "SELECT bcm.id, bcm.critid
 540                 FROM {badge_criteria_met} bcm
 541                     INNER JOIN {badge_criteria} bc ON bcm.critid = bc.id
 542                 WHERE bc.badgeid = :badgeid AND bcm.userid = :userid ";
 543         $completions = $DB->get_records_sql($sql, array('badgeid' => $this->id, 'userid' => $userid));
 544
 545         return $completions;
 546     }
 547
 548     /**
 549      * Checks if badges has award criteria set up.
 550      *
 551      * @return bool A status indicating badge has at least one criterion
 552      */
 553     public function has_criteria() {
 554         if (count($this->criteria) > 0) {
 555             return true;
 556         }
 557         return false;
 558     }
 559
 560     /**
 561      * Returns badge award criteria
 562      *
 563      * @return array An array of badge criteria
 564      */
 565     public function get_criteria() {
 566         global $DB;
 567         $criteria = array();
 568
 569         if ($records = (array)$DB->get_records('badge_criteria', array('badgeid' => $this->id))) {
 570             foreach ($records as $record) {
 571                 $criteria[$record->criteriatype] = award_criteria::build((array)$record);
 572             }
 573         }
 574
 575         return $criteria;
 576     }
 577
 578     /**
 579      * Get aggregation method for badge criteria
 580      *
 581      * @param int $criteriatype If none supplied, get overall aggregation method (optional)
 582      * @return int One of BADGE_CRITERIA_AGGREGATION_ALL or BADGE_CRITERIA_AGGREGATION_ANY
 583      */
 584     public function get_aggregation_method($criteriatype = 0) {
 585         global $DB;
 586         $params = array('badgeid' => $this->id, 'criteriatype' => $criteriatype);
 587         $aggregation = $DB->get_field('badge_criteria', 'method', $params, IGNORE_MULTIPLE);
 588
 589         if (!$aggregation) {
 590             return BADGE_CRITERIA_AGGREGATION_ALL;
 591         }
 592
 593         return $aggregation;
 594     }
 595
 596     /**
 597      * Checks if badge has expiry period or date set up.
 598      *
 599      * @return bool A status indicating badge can expire
 600      */
 601     public function can_expire() {
 602         if ($this->expireperiod || $this->expiredate) {
 603             return true;
 604         }
 605         return false;
 606     }
 607
 608     /**
 609      * Calculates badge expiry date based on either expirydate or expiryperiod.
 610      *
 611      * @param int $timestamp Time of badge issue
 612      * @return int A timestamp
 613      */
 614     public function calculate_expiry($timestamp) {
 615         $expiry = null;
 616
 617         if (isset($this->expiredate)) {
 618             $expiry = $this->expiredate;
 619         } else if (isset($this->expireperiod)) {
 620             $expiry = $timestamp + $this->expireperiod;
 621         }
 622
 623         return $expiry;
 624     }
 625
 626     /**
 627      * Checks if badge has manual award criteria set.
 628      *
 629      * @return bool A status indicating badge can be awarded manually
 630      */
 631     public function has_manual_award_criteria() {
 632         foreach ($this->criteria as $criterion) {
 633             if ($criterion->criteriatype == BADGE_CRITERIA_TYPE_MANUAL) {
 634                 return true;
 635             }
 636         }
 637         return false;
 638     }
 639
 640     /**
 641      * Fully deletes the badge or marks it as archived.
 642      *
 643      * @param $archive bool Achive a badge without actual deleting of any data.
 644      */
 645     public function delete($archive = true) {
 646         global $DB;
 647
 648         if ($archive) {
 649             $this->status = BADGE_STATUS_ARCHIVED;
 650             $this->save();
 651
 652             // Trigger event, badge archived.
 653             $eventparams = array('objectid' => $this->id, 'context' => $this->get_context());
 654             $event = \core\event\badge_archived::create($eventparams);
 655             $event->trigger();
 656             return;
 657         }
 658
 659         $fs = get_file_storage();
 660
 661         // Remove all issued badge image files and badge awards.
 662         // Cannot bulk remove area files here because they are issued in user context.
 663         $awards = $this->get_awards();
 664         foreach ($awards as $award) {
 665             $usercontext = context_user::instance($award->userid);
 666             $fs->delete_area_files($usercontext->id, 'badges', 'userbadge', $this->id);
 667         }
 668         $DB->delete_records('badge_issued', array('badgeid' => $this->id));
 669
 670         // Remove all badge criteria.
 671         $criteria = $this->get_criteria();
 672         foreach ($criteria as $criterion) {
 673             $criterion->delete();
 674         }
 675
 676         // Delete badge images.
 677         $badgecontext = $this->get_context();
 678         $fs->delete_area_files($badgecontext->id, 'badges', 'badgeimage', $this->id);
 679
 680         // Finally, remove badge itself.
 681         $DB->delete_records('badge', array('id' => $this->id));
 682
 683         // Trigger event, badge deleted.
 684         $eventparams = array('objectid' => $this->id,
 685             'context' => $this->get_context(),
 686             'other' => array('badgetype' => $this->type, 'courseid' => $this->courseid)
 687             );
 688         $event = \core\event\badge_deleted::create($eventparams);
 689         $event->trigger();
 690     }
 691 }
 692
 693 /**
 694  * Sends notifications to users about awarded badges.
 695  *
 696  * @param badge $badge Badge that was issued
 697  * @param int $userid Recipient ID
 698  * @param string $issued Unique hash of an issued badge
 699  * @param string $filepathhash File path hash of an issued badge for attachments
 700  */
 701 function badges_notify_badge_award(badge $badge, $userid, $issued, $filepathhash) {
 702     global $CFG, $DB;
 703
 704     $admin = get_admin();
 705     $userfrom = new stdClass();
 706     $userfrom->id = $admin->id;
 707     $userfrom->email = !empty($CFG->badges_defaultissuercontact) ? $CFG->badges_defaultissuercontact : $admin->email;
 708     foreach (get_all_user_name_fields() as $addname) {
 709         $userfrom->$addname = !empty($CFG->badges_defaultissuername) ? '' : $admin->$addname;
 710     }
 711     $userfrom->firstname = !empty($CFG->badges_defaultissuername) ? $CFG->badges_defaultissuername : $admin->firstname;
 712     $userfrom->maildisplay = true;
 713
 714     $issuedlink = html_writer::link(new moodle_url('/badges/badge.php', array('hash' => $issued)), $badge->name);
 715     $userto = $DB->get_record('user', array('id' => $userid), '*', MUST_EXIST);
 716
 717     $params = new stdClass();
 718     $params->badgename = $badge->name;
 719     $params->username = fullname($userto);
 720     $params->badgelink = $issuedlink;
 721     $message = badge_message_from_template($badge->message, $params);
 722     $plaintext = html_to_text($message);
 723
 724     // Notify recipient.
 725     $eventdata = new \core\message\message();
 726     $eventdata->courseid          = is_null($badge->courseid) ? SITEID : $badge->courseid; // Profile/site come with no courseid.
 727     $eventdata->component         = 'moodle';
 728     $eventdata->name              = 'badgerecipientnotice';
 729     $eventdata->userfrom          = $userfrom;
 730     $eventdata->userto            = $userto;
 731     $eventdata->notification      = 1;
 732     $eventdata->subject           = $badge->messagesubject;
 733     $eventdata->fullmessage       = $plaintext;
 734     $eventdata->fullmessageformat = FORMAT_HTML;
 735     $eventdata->fullmessagehtml   = $message;
 736     $eventdata->smallmessage      = '';
 737
 738     // Attach badge image if possible.
 739     if (!empty($CFG->allowattachments) && $badge->attachment && is_string($filepathhash)) {
 740         $fs = get_file_storage();
 741         $file = $fs->get_file_by_hash($filepathhash);
 742         $eventdata->attachment = $file;
 743         $eventdata->attachname = str_replace(' ', '_', $badge->name) . ".png";
 744
 745         message_send($eventdata);
 746     } else {
 747         message_send($eventdata);
 748     }
 749
 750     // Notify badge creator about the award if they receive notifications every time.
 751     if ($badge->notification == 1) {
 752         $userfrom = core_user::get_noreply_user();
 753         $userfrom->maildisplay = true;
 754
 755         $creator = $DB->get_record('user', array('id' => $badge->usercreated), '*', MUST_EXIST);
 756         $a = new stdClass();
 757         $a->user = fullname($userto);
 758         $a->link = $issuedlink;
 759         $creatormessage = get_string('creatorbody', 'badges', $a);
 760         $creatorsubject = get_string('creatorsubject', 'badges', $badge->name);
 761
 762         $eventdata = new \core\message\message();
 763         $eventdata->courseid          = $badge->courseid;
 764         $eventdata->component         = 'moodle';
 765         $eventdata->name              = 'badgecreatornotice';
 766         $eventdata->userfrom          = $userfrom;
 767         $eventdata->userto            = $creator;
 768         $eventdata->notification      = 1;
 769         $eventdata->subject           = $creatorsubject;
 770         $eventdata->fullmessage       = html_to_text($creatormessage);
 771         $eventdata->fullmessageformat = FORMAT_HTML;
 772         $eventdata->fullmessagehtml   = $creatormessage;
 773         $eventdata->smallmessage      = '';
 774
 775         message_send($eventdata);
 776         $DB->set_field('badge_issued', 'issuernotified', time(), array('badgeid' => $badge->id, 'userid' => $userid));
 777     }
 778 }
 779
 780 /**
 781  * Caclulates date for the next message digest to badge creators.
 782  *
 783  * @param in $schedule Type of message schedule BADGE_MESSAGE_DAILY|BADGE_MESSAGE_WEEKLY|BADGE_MESSAGE_MONTHLY.
 784  * @return int Timestamp for next cron
 785  */
 786 function badges_calculate_message_schedule($schedule) {
 787     $nextcron = 0;
 788
 789     switch ($schedule) {
 790         case BADGE_MESSAGE_DAILY:
 791             $nextcron = time() + 60 * 60 * 24;
 792             break;
 793         case BADGE_MESSAGE_WEEKLY:
 794             $nextcron = time() + 60 * 60 * 24 * 7;
 795             break;
 796         case BADGE_MESSAGE_MONTHLY:
 797             $nextcron = time() + 60 * 60 * 24 * 7 * 30;
 798             break;
 799     }
 800
 801     return $nextcron;
 802 }
 803
 804 /**
 805  * Replaces variables in a message template and returns text ready to be emailed to a user.
 806  *
 807  * @param string $message Message body.
 808  * @return string Message with replaced values
 809  */
 810 function badge_message_from_template($message, $params) {
 811     $msg = $message;
 812     foreach ($params as $key => $value) {
 813         $msg = str_replace("%$key%", $value, $msg);
 814     }
 815
 816     return $msg;
 817 }
 818
 819 /**
 820  * Get all badges.
 821  *
 822  * @param int Type of badges to return
 823  * @param int Course ID for course badges
 824  * @param string $sort An SQL field to sort by
 825  * @param string $dir The sort direction ASC|DESC
 826  * @param int $page The page or records to return
 827  * @param int $perpage The number of records to return per page
 828  * @param int $user User specific search
 829  * @return array $badge Array of records matching criteria
 830  */
 831 function badges_get_badges($type, $courseid = 0, $sort = '', $dir = '', $page = 0, $perpage = BADGE_PERPAGE, $user = 0) {
 832     global $DB;
 833     $records = array();
 834     $params = array();
 835     $where = "b.status != :deleted AND b.type = :type ";
 836     $params['deleted'] = BADGE_STATUS_ARCHIVED;
 837
 838     $userfields = array('b.id, b.name, b.status');
 839     $usersql = "";
 840     if ($user != 0) {
 841         $userfields[] = 'bi.dateissued';
 842         $userfields[] = 'bi.uniquehash';
 843         $usersql = " LEFT JOIN {badge_issued} bi ON b.id = bi.badgeid AND bi.userid = :userid ";
 844         $params['userid'] = $user;
 845         $where .= " AND (b.status = 1 OR b.status = 3) ";
 846     }
 847     $fields = implode(', ', $userfields);
 848
 849     if ($courseid != 0 ) {
 850         $where .= "AND b.courseid = :courseid ";
 851         $params['courseid'] = $courseid;
 852     }
 853
 854     $sorting = (($sort != '' && $dir != '') ? 'ORDER BY ' . $sort . ' ' . $dir : '');
 855     $params['type'] = $type;
 856
 857     $sql = "SELECT $fields FROM {badge} b $usersql WHERE $where $sorting";
 858     $records = $DB->get_records_sql($sql, $params, $page * $perpage, $perpage);
 859
 860     $badges = array();
 861     foreach ($records as $r) {
 862         $badge = new badge($r->id);
 863         $badges[$r->id] = $badge;
 864         if ($user != 0) {
 865             $badges[$r->id]->dateissued = $r->dateissued;
 866             $badges[$r->id]->uniquehash = $r->uniquehash;
 867         } else {
 868             $badges[$r->id]->awards = $DB->count_records_sql('SELECT COUNT(b.userid)
 869                                         FROM {badge_issued} b INNER JOIN {user} u ON b.userid = u.id
 870                                         WHERE b.badgeid = :badgeid AND u.deleted = 0', array('badgeid' => $badge->id));
 871             $badges[$r->id]->statstring = $badge->get_status_name();
 872         }
 873     }
 874     return $badges;
 875 }
 876
 877 /**
 878  * Get badges for a specific user.
 879  *
 880  * @param int $userid User ID
 881  * @param int $courseid Badges earned by a user in a specific course
 882  * @param int $page The page or records to return
 883  * @param int $perpage The number of records to return per page
 884  * @param string $search A simple string to search for
 885  * @param bool $onlypublic Return only public badges
 886  * @return array of badges ordered by decreasing date of issue
 887  */
 888 function badges_get_user_badges($userid, $courseid = 0, $page = 0, $perpage = 0, $search = '', $onlypublic = false) {
 889     global $CFG, $DB;
 890
 891     $params = array(
 892         'userid' => $userid
 893     );
 894     $sql = 'SELECT
 895                 bi.uniquehash,
 896                 bi.dateissued,
 897                 bi.dateexpire,
 898                 bi.id as issuedid,
 899                 bi.visible,
 900                 u.email,
 901                 b.*
 902             FROM
 903                 {badge} b,
 904                 {badge_issued} bi,
 905                 {user} u
 906             WHERE b.id = bi.badgeid
 907                 AND u.id = bi.userid
 908                 AND bi.userid = :userid';
 909
 910     if (!empty($search)) {
 911         $sql .= ' AND (' . $DB->sql_like('b.name', ':search', false) . ') ';
 912         $params['search'] = '%'.$DB->sql_like_escape($search).'%';
 913     }
 914     if ($onlypublic) {
 915         $sql .= ' AND (bi.visible = 1) ';
 916     }
 917
 918     if (empty($CFG->badges_allowcoursebadges)) {
 919         $sql .= ' AND b.courseid IS NULL';
 920     } else if ($courseid != 0) {
 921         $sql .= ' AND (b.courseid = :courseid) ';
 922         $params['courseid'] = $courseid;
 923     }
 924     $sql .= ' ORDER BY bi.dateissued DESC';
 925     $badges = $DB->get_records_sql($sql, $params, $page * $perpage, $perpage);
 926
 927     return $badges;
 928 }
 929
 930 /**
 931  * Extends the course administration navigation with the Badges page
 932  *
 933  * @param navigation_node $coursenode
 934  * @param object $course
 935  */
 936 function badges_add_course_navigation(navigation_node $coursenode, stdClass $course) {
 937     global $CFG, $SITE;
 938
 939     $coursecontext = context_course::instance($course->id);
 940     $isfrontpage = (!$coursecontext || $course->id == $SITE->id);
 941     $canmanage = has_any_capability(array('moodle/badges:viewawarded',
 942                                           'moodle/badges:createbadge',
 943                                           'moodle/badges:awardbadge',
 944                                           'moodle/badges:configurecriteria',
 945                                           'moodle/badges:configuremessages',
 946                                           'moodle/badges:configuredetails',
 947                                           'moodle/badges:deletebadge'), $coursecontext);
 948
 949     if (!empty($CFG->enablebadges) && !empty($CFG->badges_allowcoursebadges) && !$isfrontpage && $canmanage) {
 950         $coursenode->add(get_string('coursebadges', 'badges'), null,
 951                 navigation_node::TYPE_CONTAINER, null, 'coursebadges',
 952                 new pix_icon('i/badge', get_string('coursebadges', 'badges')));
 953
 954         $url = new moodle_url('/badges/index.php', array('type' => BADGE_TYPE_COURSE, 'id' => $course->id));
 955
 956         $coursenode->get('coursebadges')->add(get_string('managebadges', 'badges'), $url,
 957             navigation_node::TYPE_SETTING, null, 'coursebadges');
 958
 959         if (has_capability('moodle/badges:createbadge', $coursecontext)) {
 960             $url = new moodle_url('/badges/newbadge.php', array('type' => BADGE_TYPE_COURSE, 'id' => $course->id));
 961
 962             $coursenode->get('coursebadges')->add(get_string('newbadge', 'badges'), $url,
 963                     navigation_node::TYPE_SETTING, null, 'newbadge');
 964         }
 965     }
 966 }
 967
 968 /**
 969  * Triggered when badge is manually awarded.
 970  *
 971  * @param   object      $data
 972  * @return  boolean
 973  */
 974 function badges_award_handle_manual_criteria_review(stdClass $data) {
 975     $criteria = $data->crit;
 976     $userid = $data->userid;
 977     $badge = new badge($criteria->badgeid);
 978
 979     if (!$badge->is_active() || $badge->is_issued($userid)) {
 980         return true;
 981     }
 982
 983     if ($criteria->review($userid)) {
 984         $criteria->mark_complete($userid);
 985
 986         if ($badge->criteria[BADGE_CRITERIA_TYPE_OVERALL]->review($userid)) {
 987             $badge->criteria[BADGE_CRITERIA_TYPE_OVERALL]->mark_complete($userid);
 988             $badge->issue($userid);
 989         }
 990     }
 991
 992     return true;
 993 }
 994
 995 /**
 996  * Process badge image from form data
 997  *
 998  * @param badge $badge Badge object
 999  * @param string $iconfile Original file
1000  */
1001 function badges_process_badge_image(badge $badge, $iconfile) {
1002     global $CFG, $USER;
1003     require_once($CFG->libdir. '/gdlib.php');
1004
1005     if (!empty($CFG->gdversion)) {
1006         process_new_icon($badge->get_context(), 'badges', 'badgeimage', $badge->id, $iconfile, true);
1007         @unlink($iconfile);
1008
1009         // Clean up file draft area after badge image has been saved.
1010         $context = context_user::instance($USER->id, MUST_EXIST);
1011         $fs = get_file_storage();
1012         $fs->delete_area_files($context->id, 'user', 'draft');
1013     }
1014 }
1015
1016 /**
1017  * Print badge image.
1018  *
1019  * @param badge $badge Badge object
1020  * @param stdClass $context
1021  * @param string $size
1022  */
1023 function print_badge_image(badge $badge, stdClass $context, $size = 'small') {
1024     $fsize = ($size == 'small') ? 'f2' : 'f1';
1025
1026     $imageurl = moodle_url::make_pluginfile_url($context->id, 'badges', 'badgeimage', $badge->id, '/', $fsize, false);
1027     // Appending a random parameter to image link to forse browser reload the image.
1028     $imageurl->param('refresh', rand(1, 10000));
1029     $attributes = array('src' => $imageurl, 'alt' => s($badge->name), 'class' => 'activatebadge');
1030
1031     return html_writer::empty_tag('img', $attributes);
1032 }
1033
1034 /**
1035  * Bake issued badge.
1036  *
1037  * @param string $hash Unique hash of an issued badge.
1038  * @param int $badgeid ID of the original badge.
1039  * @param int $userid ID of badge recipient (optional).
1040  * @param boolean $pathhash Return file pathhash instead of image url (optional).
1041  * @return string|url Returns either new file path hash or new file URL
1042  */
1043 function badges_bake($hash, $badgeid, $userid = 0, $pathhash = false) {
1044     global $CFG, $USER;
1045     require_once(__DIR__ . '/../badges/lib/bakerlib.php');
1046
1047     $badge = new badge($badgeid);
1048     $badge_context = $badge->get_context();
1049     $userid = ($userid) ? $userid : $USER->id;
1050     $user_context = context_user::instance($userid);
1051
1052     $fs = get_file_storage();
1053     if (!$fs->file_exists($user_context->id, 'badges', 'userbadge', $badge->id, '/', $hash . '.png')) {
1054         if ($file = $fs->get_file($badge_context->id, 'badges', 'badgeimage', $badge->id, '/', 'f1.png')) {
1055             $contents = $file->get_content();
1056
1057             $filehandler = new PNG_MetaDataHandler($contents);
1058             $assertion = new moodle_url('/badges/assertion.php', array('b' => $hash));
1059             if ($filehandler->check_chunks("tEXt", "openbadges")) {
1060                 // Add assertion URL tExt chunk.
1061                 $newcontents = $filehandler->add_chunks("tEXt", "openbadges", $assertion->out(false));
1062                 $fileinfo = array(
1063                         'contextid' => $user_context->id,
1064                         'component' => 'badges',
1065                         'filearea' => 'userbadge',
1066                         'itemid' => $badge->id,
1067                         'filepath' => '/',
1068                         'filename' => $hash . '.png',
1069                 );
1070
1071                 // Create a file with added contents.
1072                 $newfile = $fs->create_file_from_string($fileinfo, $newcontents);
1073                 if ($pathhash) {
1074                     return $newfile->get_pathnamehash();
1075                 }
1076             }
1077         } else {
1078             debugging('Error baking badge image!', DEBUG_DEVELOPER);
1079             return;
1080         }
1081     }
1082
1083     // If file exists and we just need its path hash, return it.
1084     if ($pathhash) {
1085         $file = $fs->get_file($user_context->id, 'badges', 'userbadge', $badge->id, '/', $hash . '.png');
1086         return $file->get_pathnamehash();
1087     }
1088
1089     $fileurl = moodle_url::make_pluginfile_url($user_context->id, 'badges', 'userbadge', $badge->id, '/', $hash, true);
1090     return $fileurl;
1091 }
1092
1093 /**
1094  * Returns external backpack settings and badges from this backpack.
1095  *
1096  * This function first checks if badges for the user are cached and
1097  * tries to retrieve them from the cache. Otherwise, badges are obtained
1098  * through curl request to the backpack.
1099  *
1100  * @param int $userid Backpack user ID.
1101  * @param boolean $refresh Refresh badges collection in cache.
1102  * @return null|object Returns null is there is no backpack or object with backpack settings.
1103  */
1104 function get_backpack_settings($userid, $refresh = false) {
1105     global $DB;
1106     require_once(__DIR__ . '/../badges/lib/backpacklib.php');
1107
1108     // Try to get badges from cache first.
1109     $badgescache = cache::make('core', 'externalbadges');
1110     $out = $badgescache->get($userid);
1111     if ($out !== false && !$refresh) {
1112         return $out;
1113     }
1114     // Get badges through curl request to the backpack.
1115     $record = $DB->get_record('badge_backpack', array('userid' => $userid));
1116     if ($record) {
1117         $backpack = new OpenBadgesBackpackHandler($record);
1118         $out = new stdClass();
1119         $out->backpackurl = $backpack->get_url();
1120
1121         if ($collections = $DB->get_records('badge_external', array('backpackid' => $record->id))) {
1122             $out->totalcollections = count($collections);
1123             $out->totalbadges = 0;
1124             $out->badges = array();
1125             foreach ($collections as $collection) {
1126                 $badges = $backpack->get_badges($collection->collectionid);
1127                 if (isset($badges->badges)) {
1128                     $out->badges = array_merge($out->badges, $badges->badges);
1129                     $out->totalbadges += count($badges->badges);
1130                 } else {
1131                     $out->badges = array_merge($out->badges, array());
1132                 }
1133             }
1134         } else {
1135             $out->totalbadges = 0;
1136             $out->totalcollections = 0;
1137         }
1138
1139         $badgescache->set($userid, $out);
1140         return $out;
1141     }
1142
1143     return null;
1144 }
1145
1146 /**
1147  * Download all user badges in zip archive.
1148  *
1149  * @param int $userid ID of badge owner.
1150  */
1151 function badges_download($userid) {
1152     global $CFG, $DB;
1153     $context = context_user::instance($userid);
1154     $records = $DB->get_records('badge_issued', array('userid' => $userid));
1155
1156     // Get list of files to download.
1157     $fs = get_file_storage();
1158     $filelist = array();
1159     foreach ($records as $issued) {
1160         $badge = new badge($issued->badgeid);
1161         // Need to make image name user-readable and unique using filename safe characters.
1162         $name =  $badge->name . ' ' . userdate($issued->dateissued, '%d %b %Y') . ' ' . hash('crc32', $badge->id);
1163         $name = str_replace(' ', '_', $name);
1164         $name = clean_param($name, PARAM_FILE);
1165         if ($file = $fs->get_file($context->id, 'badges', 'userbadge', $issued->badgeid, '/', $issued->uniquehash . '.png')) {
1166             $filelist[$name . '.png'] = $file;
1167         }
1168     }
1169
1170     // Zip files and sent them to a user.
1171     $tempzip = tempnam($CFG->tempdir.'/', 'mybadges');
1172     $zipper = new zip_packer();
1173     if ($zipper->archive_to_pathname($filelist, $tempzip)) {
1174         send_temp_file($tempzip, 'badges.zip');
1175     } else {
1176         debugging("Problems with archiving the files.", DEBUG_DEVELOPER);
1177         die;
1178     }
1179 }
1180
1181 /**
1182  * Checks if badges can be pushed to external backpack.
1183  *
1184  * @return string Code of backpack accessibility status.
1185  */
1186 function badges_check_backpack_accessibility() {
1187     global $CFG;
1188     include_once $CFG->libdir . '/filelib.php';
1189
1190     // Using fake assertion url to check whether backpack can access the web site.
1191     $fakeassertion = new moodle_url('/badges/assertion.php', array('b' => 'abcd1234567890'));
1192
1193     // Curl request to backpack baker.
1194     $curl = new curl();
1195     $options = array(
1196         'FRESH_CONNECT' => true,
1197         'RETURNTRANSFER' => true,
1198         'HEADER' => 0,
1199         'CONNECTTIMEOUT' => 2,
1200     );
1201     $location = BADGE_BACKPACKURL . '/baker';
1202     $out = $curl->get($location, array('assertion' => $fakeassertion->out(false)), $options);
1203
1204     $data = json_decode($out);
1205     if (!empty($curl->error)) {
1206         return 'curl-request-timeout';
1207     } else {
1208         if (isset($data->code) && $data->code == 'http-unreachable') {
1209             return 'http-unreachable';
1210         } else {
1211             return 'available';
1212         }
1213     }
1214
1215     return false;
1216 }
1217
1218 /**
1219  * Checks if user has external backpack connected.
1220  *
1221  * @param int $userid ID of a user.
1222  * @return bool True|False whether backpack connection exists.
1223  */
1224 function badges_user_has_backpack($userid) {
1225     global $DB;
1226     return $DB->record_exists('badge_backpack', array('userid' => $userid));
1227 }
1228
1229 /**
1230  * Handles what happens to the course badges when a course is deleted.
1231  *
1232  * @param int $courseid course ID.
1233  * @return void.
1234  */
1235 function badges_handle_course_deletion($courseid) {
1236     global $CFG, $DB;
1237     include_once $CFG->libdir . '/filelib.php';
1238
1239     $systemcontext = context_system::instance();
1240     $coursecontext = context_course::instance($courseid);
1241     $fs = get_file_storage();
1242
1243     // Move badges images to the system context.
1244     $fs->move_area_files_to_new_context($coursecontext->id, $systemcontext->id, 'badges', 'badgeimage');
1245
1246     // Get all course badges.
1247     $badges = $DB->get_records('badge', array('type' => BADGE_TYPE_COURSE, 'courseid' => $courseid));
1248     foreach ($badges as $badge) {
1249         // Archive badges in this course.
1250         $toupdate = new stdClass();
1251         $toupdate->id = $badge->id;
1252         $toupdate->type = BADGE_TYPE_SITE;
1253         $toupdate->courseid = null;
1254         $toupdate->status = BADGE_STATUS_ARCHIVED;
1255         $DB->update_record('badge', $toupdate);
1256     }
1257 }
1258
1259 /**
1260  * Loads JS files required for backpack support.
1261  *
1262  * @uses   $CFG, $PAGE
1263  * @return void
1264  */
1265 function badges_setup_backpack_js() {
1266     global $CFG, $PAGE;
1267     if (!empty($CFG->badges_allowexternalbackpack)) {
1268         $PAGE->requires->string_for_js('error:backpackproblem', 'badges');
1269         $PAGE->requires->js(new moodle_url(BADGE_BACKPACKURL . '/issuer.js'), true);
1270         $PAGE->requires->js('/badges/backpack.js', true);
1271     }
1272 }