/**
  * Store the document content to its origin
  */
 public static function save()
 {
     try {
         $esId = @$_SERVER['HTTP_WEBODF_SESSION_ID'];
         if (!$esId) {
             throw new \Exception('Session id can not be empty');
         }
         $memberId = @$_SERVER['HTTP_WEBODF_MEMBER_ID'];
         $currentMember = new Db\Member();
         $currentMember->load($memberId);
         if (is_null($currentMember->getIsGuest()) || $currentMember->getIsGuest()) {
             self::preDispatchGuest();
         } else {
             $uid = self::preDispatch();
         }
         //check if member belongs to the session
         if ($esId != $currentMember->getEsId()) {
             throw new \Exception($memberId . ' does not belong to session ' . $esId);
         }
         // Extra info for future usage
         // $sessionRevision = Helper::getArrayValueByKey($_SERVER, 'HTTP_WEBODF_SESSION_REVISION');
         $stream = fopen('php://input', 'r');
         if (!$stream) {
             throw new \Exception('New content missing');
         }
         $content = stream_get_contents($stream);
         $session = new Db\Session();
         $session->load($esId);
         if (!$session->getEsId()) {
             throw new \Exception('Session does not exist');
         }
         try {
             if ($currentMember->getIsGuest()) {
                 $file = File::getByShareToken($currentMember->getToken());
             } else {
                 $file = new File($session->getFileId());
             }
             list($view, $path) = $file->getOwnerViewAndPath(true);
         } catch (\Exception $e) {
             //File was deleted or unshared. We need to save content as new file anyway
             //Sorry, but for guests it would be lost :(
             if (isset($uid)) {
                 $view = new \OC\Files\View('/' . $uid . '/files');
                 $dir = \OCP\Config::getUserValue(\OCP\User::getUser(), 'documents', 'save_path', '');
                 $path = Helper::getNewFileName($view, $dir . 'New Document.odt');
             }
         }
         $member = new Db\Member();
         $members = $member->getActiveCollection($esId);
         $memberIds = array_map(function ($x) {
             return $x['member_id'];
         }, $members);
         // Active users except current user
         $memberCount = count($memberIds) - 1;
         if ($view->file_exists($path)) {
             $proxyStatus = \OC_FileProxy::$enabled;
             \OC_FileProxy::$enabled = false;
             $currentHash = sha1($view->file_get_contents($path));
             \OC_FileProxy::$enabled = $proxyStatus;
             if (!Helper::isVersionsEnabled() && $currentHash !== $session->getGenesisHash()) {
                 // Original file was modified externally. Save to a new one
                 $path = Helper::getNewFileName($view, $path, '-conflict');
             }
             $mimetype = $view->getMimeType($path);
         } else {
             $mimetype = Storage::MIMETYPE_LIBREOFFICE_WORDPROCESSOR;
         }
         $data = Filter::write($content, $mimetype);
         if ($view->file_put_contents($path, $data['content'])) {
             // Not a last user
             if ($memberCount > 0) {
                 // Update genesis hash to prevent conflicts
                 Helper::debugLog('Update hash');
                 $session->updateGenesisHash($esId, sha1($data['content']));
             } else {
                 // Last user. Kill session data
                 Db\Session::cleanUp($esId);
             }
             $view->touch($path);
         }
         \OCP\JSON::success();
     } catch (\Exception $e) {
         Helper::warnLog('Saving failed. Reason:' . $e->getMessage());
         //\OCP\JSON::error(array('message'=>$e->getMessage()));
         \OC_Response::setStatus(500);
     }
     exit;
 }