badges/assertion.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  * Serve assertion JSON by unique hash of issued badge
  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 define('AJAX_SCRIPT', true);
  28 define('NO_MOODLE_COOKIES', true); // No need for a session here.
  29
  30 require_once(__DIR__ . '/../config.php');
  31
  32 if (empty($CFG->enablebadges)) {
  33     print_error('badgesdisabled', 'badges');
  34 }
  35
  36 $hash = required_param('b', PARAM_ALPHANUM); // Issued badge unique hash for badge assertion.
  37 $action = optional_param('action', null, PARAM_BOOL); // Generates badge class if true.
  38
  39 $assertion = new core_badges_assertion($hash);
  40
  41 if (!is_null($action)) {
  42     // Get badge class or issuer information depending on $action.
  43     $json = ($action) ? $assertion->get_badge_class() : $assertion->get_issuer();
  44 } else {
  45     // Otherwise, get badge assertion.
  46     $column = $DB->sql_compare_text('uniquehash', 255);
  47     if ($DB->record_exists_sql(sprintf('SELECT * FROM {badge_issued} WHERE %s = ?', $column), array($hash))) {
  48         $json = $assertion->get_badge_assertion();
  49     } else { // Revoked badge.
  50         header("HTTP/1.0 410 Gone");
  51         echo json_encode(array("revoked" => true));
  52         die();
  53     }
  54 }
  55
  56
  57 echo $OUTPUT->header();
  58 echo json_encode($json);