public function getShape($slideNumber, $shapeIndex, $storageName = '', $folderName = '') {    
        $strURI = Product::$baseProductUri . '/slides/' . $this->getFileName() . '/slides/' . $slideNumber . '/shapes/' . $shapeIndex;
        if ($folderName != '') {
            $strURI .= '?folder=' . $folderName;
        }
        if ($storageName != '') {
            $strURI .= '&storage=' . $storageName;
        }
        
        $signedURI = Utils::sign($strURI);

        $responseStream = Utils::processCommand($signedURI, 'GET', '', '');

        $json = json_decode($responseStream);
        
        if ($json->Code == 200)
            return $json->Shape;
        else 
            return false;
    }