repository: New Picasa Web Albums Plugin MDL-17473

lang/en_utf8/repository_picasa.php

@@ -0,0 +1,3 @@
+<?php
+$string['repositoryname'] = 'Picasa Web Album';
+?>

lib/googleapi.php

@@ -285,6 +285,9 @@ class google_picasa {
     const REALM             = 'http://picasaweb.google.com/data/';
     const USER_PREF_NAME    = 'google_authsub_sesskey_picasa';
     const UPLOAD_LOCATION   = 'http://picasaweb.google.com/data/feed/api/user/default/albumid/default';
+    const ALBUM_PHOTO_LIST  = 'http://picasaweb.google.com/data/feed/api/user/default/albumid/';
+    const PHOTO_SEARCH_URL  = 'http://picasaweb.google.com/data/feed/api/user/default?kind=photo&q=';
+    const LIST_ALBUMS_URL   = 'http://picasaweb.google.com/data/feed/api/user/default';
 
     private $google_curl = null;
 
@@ -332,6 +335,117 @@ class google_picasa {
             return false;
         }
     }
+
+    /**
+     * Returns list of photos for file picker.
+     * If top level then returns list of albums, otherwise
+     * photos within an album.
+     *
+     * @param string $path The path to files (assumed to be albumid)
+     * @return mixed $files A list of files for the file picker
+     */
+    public function get_file_list($path = ''){
+        if(!$path){
+            return $this->get_albums();
+        }else{
+            return $this->get_album_photos($path);
+        }
+    }
+
+    /**
+     * Returns list of photos in album specified
+     *
+     * @param int $albumid Photo album to list photos from
+     * @return mixed $files A list of files for the file picker
+     */
+    public function get_album_photos($albumid){
+        $albumcontent = $this->google_curl->get(google_picasa::ALBUM_PHOTO_LIST.$albumid);
+
+        return $this->get_photo_details($albumcontent);
+    }
+
+    /**
+     * Does text search on the users photos and returns 
+     * matches in format for picasa api
+     *
+     * @param string $query Search terms
+     * @return mixed $files A list of files for the file picker
+     */
+    public function do_photo_search($query){
+        $content = $this->google_curl->get(google_picasa::PHOTO_SEARCH_URL.htmlentities($query));
+
+        return $this->get_photo_details($content);
+    }
+
+    /**
+     * Gets all the users albums and returns them as a list of folders
+     * for the file picker
+     *
+     * @return mixes $files Array in the format get_listing uses for folders
+     */
+    public function get_albums(){
+        $content = $this->google_curl->get(google_picasa::LIST_ALBUMS_URL);
+        $xml = new SimpleXMLElement($content);
+
+        $files = array();
+
+        foreach($xml->entry as $album){
+            $gphoto = $album->children('http://schemas.google.com/photos/2007');
+
+            $mediainfo = $album->children('http://search.yahoo.com/mrss/');
+            //hacky...
+            $thumbnailinfo = $mediainfo->group->thumbnail[0]->attributes();
+
+            $files[] = array( 'title' => (string) $gphoto->name,
+                'date'  => userdate($gphoto->timestamp),
+                'size'  => (int) $gphoto->bytesUsed,
+                'path'  => (string) $gphoto->id,
+                'thumbnail' => (string) $thumbnailinfo['url'],
+                'thumbnail_width' => (int) $thumbnailinfo['width'],
+                'thumbnail_height' => (int) $thumbnailinfo['height'],
+                'children' => array(),
+            );
+
+        }
+
+        return $files;
+    }
+
+    /**
+     * Recieves XML from a picasa list of photos and returns
+     * array in format for file picker.
+     *
+     * @param string $rawxml XML from picasa api
+     * @return mixed $files A list of files for the file picker
+     */
+    public function get_photo_details($rawxml){
+
+        $xml = new SimpleXMLElement($rawxml);
+
+        $files = array();
+
+        foreach($xml->entry as $photo){
+            $gphoto = $photo->children('http://schemas.google.com/photos/2007');
+
+            $mediainfo = $photo->children('http://search.yahoo.com/mrss/');
+            $fullinfo = $mediainfo->group->content->attributes();
+            //hacky...
+            $thumbnailinfo = $mediainfo->group->thumbnail[0]->attributes();
+
+            $files[] = array('title' => (string) $mediainfo->group->title,
+                'date'  => userdate($gphoto->timestamp),
+                'size' => (int) $gphoto->size,
+                'path' => $gphoto->albumid.'/'.$gphoto->id,
+                'thumbnail' => (string) $thumbnailinfo['url'],
+                'thumbnail_width' => (int) $thumbnailinfo['width'],
+                'thumbnail_height' => (int) $thumbnailinfo['height'],
+                'source' => (string) $fullinfo['url'],
+            );
+        }
+
+        return $files;
+    }
+
 }
 
 /**

repository/picasa/repository.class.php

@@ -0,0 +1,101 @@
+<?php
+/**
+ * Picasa Repository Plugin
+ *
+ * @author Dan Poltawski <[email protected]>
+ * @version $Id$
+ * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
+ */
+
+require_once($CFG->libdir.'/googleapi.php');
+
+class repository_picasa extends repository {
+    private $subauthtoken = '';
+
+    public function __construct($repositoryid, $context = SITEID, $options = array()) {
+        global $USER;
+        parent::__construct($repositoryid, $context, $options);
+
+        // TODO: I wish there was somewhere we could explicitly put this outside of constructor..
+        $googletoken = optional_param('token', false, PARAM_RAW);
+        if($googletoken){
+            $gauth = new google_authsub(false, $googletoken); // will throw exception if fails
+            google_picasa::set_sesskey($gauth->get_sessiontoken(), $USER->id);
+        }
+
+        # fixme - we are not checking login before all functions in the repo api.. eg search
+        # MDL-17474
+        $this->check_login();
+    }
+
+    public function check_login() {
+        global $USER;
+
+        $sesskey = google_picasa::get_sesskey($USER->id);
+
+        if($sesskey){
+            try{
+                $gauth = new google_authsub($sesskey);
+                $this->subauthtoken = $sesskey;
+                return true;
+            }catch(Exception $e){
+                // sesskey is not valid, delete store and re-auth
+                google_picasa::delete_sesskey($USER->id);
+            }
+        }
+
+        return false;
+    }
+
+    public function print_login($ajax = true){ 
+        global $CFG;
+        if($ajax){
+            $ret = array(); 
+            $popup_btn = new stdclass; 
+            $popup_btn->type = 'popup'; 
+            $returnurl = $CFG->wwwroot.'/repository/ws.php?callback=yes&repo_id='.$this->id;
+            $popup_btn->url = google_authsub::login_url($returnurl, google_picasa::REALM);
+            $ret['login'] = array($popup_btn); 
+            return $ret; 
+        }
+    }
+
+    public function get_listing($path='') {
+        $picasa = new google_picasa(new google_authsub($this->subauthtoken));
+
+        $ret = array();
+        $ret['dynload'] = true;
+        $ret['list'] = $picasa->get_file_list($path);
+        return $ret;
+    }
+
+    public function search($query){
+        $picasa = new google_picasa(new google_authsub($this->subauthtoken));
+
+        $ret = array();
+        $ret['list'] =  $picasa->do_photo_search($query);
+        return $ret;
+    }
+
+    public function logout(){
+        global $USER;
+
+        $token = google_picasa::get_sesskey($USER->id);
+
+        $gauth = new google_authsub($token);
+        // revoke token from google
+        $gauth->revoke_session_token();
+
+        google_picasa::delete_sesskey($USER->id);
+        $this->subauthtoken = '';
+
+        return parent::logout();
+    }
+
+    public function get_name(){
+        return get_string('repositoryname', 'repository_picasa');
+    }
+}
+
+// Icon for this plugin retrieved from http://www.iconspedia.com/icon/picasa-2711.html
+// Where the license is said documented to be Free