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