repository/googledocs New repository plugin MDL-16383

Google have now allowed documents to be downloaded via their API
(http://googledataapis.blogspot.com/2009/02/start-downloads.html) so
the google docs repo plugin could be finished.

At the moment i've set the export format hardcoded, hopefully we can allow the
repo api let the user choose later...

lang/en_utf8/repository_googledocs.php

@@ -0,0 +1,3 @@
+<?php
+$string['repositoryname'] = 'Google Docs';
+?>

lib/googleapi.php

@@ -52,6 +52,18 @@ protected function request($url, $options = array()){
         return $ret;
     }
 
+    protected function multi($requests, $options = array()) {
+        if($this->token){
+            // Adds authorisation head to a request so that it can be authentcated
+            $this->setHeader('Authorization: '. $this->get_auth_header_name().'"'.$this->token.'"');
+        }
+
+        $ret = parent::multi($requests, $options);
+        // reset headers for next request
+        $this->header = array();
+        return $ret;
+    }
+
     public function get_sessiontoken(){
         return $this->token;
     }
@@ -190,7 +202,8 @@ public static function get_auth_header_name(){
  * http://code.google.com/apis/documents/docs/2.0/developers_guide_protocol.html
  */
 class google_docs {
-    const REALM            = 'http://docs.google.com/feeds/documents';
+    // need both docs and the spreadsheets realm
+    const REALM            = 'http://docs.google.com/feeds/ http://spreadsheets.google.com/feeds/';
     const DOCUMENTFEED_URL = 'http://docs.google.com/feeds/documents/private/full';
     const USER_PREF_NAME   = 'google_authsub_sesskey';
 
@@ -229,6 +242,7 @@ public static function delete_sesskey($userid){
      */
     #FIXME
     public function get_file_list($search = ''){
+        global $CFG;
         $url = google_docs::DOCUMENTFEED_URL;
 
         if($search){
@@ -238,14 +252,41 @@ public function get_file_list($search = ''){
 
         $xml = new SimpleXMLElement($content);
 
+
+
         $files = array();
         foreach($xml->entry as $gdoc){
 
-            $files[] =  array( 'title' => "$gdoc->title",
-                'url'  =>  "{$gdoc->content['src']}",
-                'source' => "{$gdoc->content['src']}",
-                'date'   => usertime(strtotime($gdoc->updated)),
-            );
+            // there doesn't seem to to be cleaner way of getting the id/type 
+            // than spliting this..
+            if (preg_match('/^http:\/\/docs.google.com\/feeds\/documents\/private\/full\/([^%]*)%3A(.*)$/', $gdoc->id, $matches)){
+                $docid = $matches[2];
+
+                // FIXME: We're making hard-coded choices about format here. 
+                // If the repo api can support it, we could let the user 
+                // chose.
+                switch($matches[1]){
+                case 'document': 
+                    $title = $gdoc->title.'.rtf';
+                    $source = 'http://docs.google.com/feeds/download/documents/Export?docID='.$docid.'&exportFormat=rtf';
+                    break;
+                case 'presentation':
+                    $title = $gdoc->title.'.ppt';
+                    $source = 'http://docs.google.com/feeds/download/presentations/Export?docID='.$docid.'&exportFormat=ppt';
+                    break;
+                case 'spreadsheet':
+                    $title = $gdoc->title.'.xls';
+                    $source = 'http://spreadsheets.google.com/feeds/download/spreadsheets/Export?key='.$docid.'&fmcmd=4';
+                    break;
+                }
+
+                $files[] =  array( 'title' => $title, 
+                    'url' => "{$gdoc->link[0]->attributes()->href}",
+                    'source' => $source, 
+                    'date'   => usertime(strtotime($gdoc->updated)),
+                    'thumbnail' => $CFG->pixpath.'/f/'.mimeinfo('icon32', $title)
+                );
+            }
         }
 
         return $files;

repository/googledocs/repository.class.php

@@ -0,0 +1,127 @@
+<?php
+/**
+ * Google Docs Plugin
+ *
+ * @author Dan Poltawski <talktodan@gmail.com>
+ * @version $Id$
+ * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
+ */
+
+require_once($CFG->libdir.'/googleapi.php');
+
+class repository_googledocs 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, $googletoken); // will throw exception if fails
+            google_docs::set_sesskey($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;
+
+        $sesskey = google_docs::get_sesskey($USER->id);
+
+        if($sesskey){
+            try{
+                $gauth = new google_authsub($sesskey);
+                $this->subauthtoken = $sesskey;
+                return true;
+            }catch(Exception $e){
+                // sesskey is not valid, delete store and re-auth
+                google_docs::delete_sesskey($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_docs::REALM);
+            $ret['login'] = array($popup_btn); 
+            return $ret; 
+        }
+    }
+
+    public function get_listing($path='', $page = '') {
+        $gdocs = new google_docs(new google_authsub($this->subauthtoken));
+
+        $ret = array();
+        $ret['dynload'] = true;
+        $ret['list'] = $gdocs->get_file_list();
+        return $ret;
+    }
+
+    public function search($query){
+        $gdocs = new google_docs(new google_authsub($this->subauthtoken));
+
+        $ret = array();
+        $ret['dynload'] = true;
+        $ret['list'] = $gdocs->get_file_list($query);
+        return $ret;
+    }
+
+    public function logout(){
+        global $USER;
+
+        $token = google_docs::get_sesskey($USER->id);
+
+        $gauth = new google_authsub($token);
+        // revoke token from google
+        $gauth->revoke_session_token();
+
+        google_docs::delete_sesskey($USER->id);
+        $this->subauthtoken = '';
+
+        return parent::logout();
+    }
+
+    public function get_name(){
+        return get_string('repositoryname', 'repository_googledocs');
+    }
+
+    public function get_file($url, $file) {
+        global $CFG;
+
+
+        //FIXME: Why does every repo plugin.. do this mktemp file itself..
+
+        if (!file_exists($CFG->dataroot.'/repository/download')) {
+            mkdir($CFG->dataroot.'/repository/download/', 0777, true);
+        }
+
+        if(is_dir($CFG->dataroot.'/repository/download')) {
+            $dir = $CFG->dataroot.'/repository/download/';
+        }
+
+        if (empty($file)){
+            $file = time();
+        }
+
+        $fp = fopen($dir.$file, 'w');
+        $gdocs = new google_docs(new google_authsub($this->subauthtoken));
+        $gdocs->download_file($url, $fp);
+
+        return $dir.$file;
+     }
+
+
+}
+//Icon from: http://www.iconspedia.com/icon/google-2706.html