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