badges/lib/backpacklib.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  * External backpack library.
  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 global $CFG;
  30 require_once($CFG->libdir . '/filelib.php');
  31
  32 // Adopted from https://github.com/jbkc85/openbadges-class-php.
  33 // Author Jason Cameron <jbkc85@gmail.com>.
  34
  35 class OpenBadgesBackpackHandler {
  36     private $backpack;
  37     private $email;
  38     private $backpackuid = 0;
  39
  40     public function __construct($record) {
  41         $this->backpack = $record->backpackurl;
  42         $this->email = $record->email;
  43         $this->backpackuid = isset($record->backpackuid) ? $record->backpackuid : 0;
  44     }
  45
  46     public function curl_request($action, $collection = null) {
  47         $curl = new curl();
  48
  49         switch($action) {
  50             case 'user':
  51                 $url = $this->backpack . "/displayer/convert/email";
  52                 $param = array('email' => $this->email);
  53                 break;
  54             case 'groups':
  55                 $url = $this->backpack . '/displayer/' . $this->backpackuid . '/groups.json';
  56                 break;
  57             case 'badges':
  58                 $url = $this->backpack . '/displayer/' . $this->backpackuid . '/group/' . $collection . '.json';
  59                 break;
  60         }
  61
  62         $curl->setHeader(array('Accept: application/json', 'Expect:'));
  63         $options = array(
  64             'FRESH_CONNECT'     => true,
  65             'RETURNTRANSFER'    => true,
  66             'FORBID_REUSE'      => true,
  67             'HEADER'            => 0,
  68             'CONNECTTIMEOUT'    => 3,
  69             // Follow redirects with the same type of request when sent 301, or 302 redirects.
  70             'CURLOPT_POSTREDIR' => 3
  71         );
  72
  73         if ($action == 'user') {
  74             $out = $curl->post($url, $param, $options);
  75         } else {
  76             $out = $curl->get($url, array(), $options);
  77         }
  78
  79         return json_decode($out);
  80     }
  81
  82     private function check_status($status) {
  83         switch($status) {
  84             case "missing":
  85                 $response = array(
  86                     'status'  => $status,
  87                     'message' => get_string('error:nosuchuser', 'badges')
  88                 );
  89                 return $response;
  90         }
  91     }
  92
  93     public function get_collections() {
  94         $json = $this->curl_request('user', $this->email);
  95         if (isset($json->status)) {
  96             if ($json->status != 'okay') {
  97                 return $this->check_status($json->status);
  98             } else {
  99                 $this->backpackuid = $json->userId;
 100                 return $this->curl_request('groups');
 101             }
 102         }
 103     }
 104
 105     public function get_badges($collection) {
 106         $json = $this->curl_request('user', $this->email);
 107         if (isset($json->status)) {
 108             if ($json->status != 'okay') {
 109                 return $this->check_status($json->status);
 110             } else {
 111                 return $this->curl_request('badges', $collection);
 112             }
 113         }
 114     }
 115
 116     public function get_url() {
 117         return $this->backpack;
 118     }
 119 }