repository/picasa/lib.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * Picasa Repository Plugin
  20  *
  21  * @since 2.0
  22  * @package    repository
  23  * @subpackage picasa
  24  * @copyright  2009 Dan Poltawski
  25  * @author     Dan Poltawski <talktodan@gmail.com>
  26  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  27  */
  28
  29 require_once($CFG->libdir.'/googleapi.php');
  30
  31 class repository_picasa extends repository {
  32     private $subauthtoken = '';
  33
  34     public function __construct($repositoryid, $context = SYSCONTEXTID, $options = array()) {
  35         global $USER;
  36         parent::__construct($repositoryid, $context, $options);
  37
  38         // TODO: I wish there was somewhere we could explicitly put this outside of constructor..
  39         $googletoken = optional_param('token', false, PARAM_RAW);
  40         if($googletoken){
  41             $gauth = new google_authsub(false, $googletoken); // will throw exception if fails
  42             google_picasa::set_sesskey($gauth->get_sessiontoken(), $USER->id);
  43         }
  44         $this->check_login();
  45     }
  46
  47     public function check_login() {
  48         global $USER;
  49
  50         $sesskey = google_picasa::get_sesskey($USER->id);
  51
  52         if($sesskey){
  53             try{
  54                 $gauth = new google_authsub($sesskey);
  55                 $this->subauthtoken = $sesskey;
  56                 return true;
  57             }catch(Exception $e){
  58                 // sesskey is not valid, delete store and re-auth
  59                 google_picasa::delete_sesskey($USER->id);
  60             }
  61         }
  62
  63         return false;
  64     }
  65
  66     public function print_login(){
  67         global $CFG;
  68         $returnurl = $CFG->wwwroot.'/repository/repository_callback.php?callback=yes&repo_id='.$this->id;
  69         $authurl = google_authsub::login_url($returnurl, google_picasa::REALM);
  70         if($this->options['ajax']){
  71             $ret = array();
  72             $popup_btn = new stdClass();
  73             $popup_btn->type = 'popup';
  74             $popup_btn->url = $authurl;
  75             $ret['login'] = array($popup_btn);
  76             return $ret;
  77         } else {
  78             echo '<a target="_blank" href="'.$authurl.'">Login</a>';
  79         }
  80     }
  81
  82     public function get_listing($path='', $page = '') {
  83         $picasa = new google_picasa(new google_authsub($this->subauthtoken));
  84
  85         $ret = array();
  86         $ret['dynload'] = true;
  87         $ret['manage'] = google_picasa::MANAGE_URL;
  88         $ret['list'] = $picasa->get_file_list($path);
  89         $ret['path'] = array((object)array('name'=>get_string('home'), 'path' => ''));
  90         if ($path) {
  91             $ret['path'][] = (object)array('name'=>$picasa->get_last_album_name(), 'path' => $path);
  92         }
  93         return $ret;
  94     }
  95
  96     public function search($search_text, $page = 0) {
  97         $picasa = new google_picasa(new google_authsub($this->subauthtoken));
  98
  99         $ret = array();
 100         $ret['manage'] = google_picasa::MANAGE_URL;
 101         $ret['list'] =  $picasa->do_photo_search($search_text);
 102         return $ret;
 103     }
 104
 105     public function logout(){
 106         global $USER;
 107
 108         $token = google_picasa::get_sesskey($USER->id);
 109
 110         $gauth = new google_authsub($token);
 111         // revoke token from google
 112         $gauth->revoke_session_token();
 113
 114         google_picasa::delete_sesskey($USER->id);
 115         $this->subauthtoken = '';
 116
 117         return parent::logout();
 118     }
 119
 120     public function get_name(){
 121         return get_string('pluginname', 'repository_picasa');
 122     }
 123     public function supported_filetypes() {
 124         return array('web_image');
 125     }
 126     public function supported_returntypes() {
 127         return (FILE_INTERNAL | FILE_EXTERNAL);
 128     }
 129 }
 130
 131 // Icon for this plugin retrieved from http://www.iconspedia.com/icon/picasa-2711.html
 132 // Where the license is said documented to be Free