public function unzip($hash, Workspace $workspace)
    {
        $filesPath = $this->container->getParameter('claroline.param.files_directory').DIRECTORY_SEPARATOR.'webresource'.DIRECTORY_SEPARATOR.$workspace->getUuid().DIRECTORY_SEPARATOR;
        $zipPath = $this->container->getParameter('claroline.param.uploads_directory').DIRECTORY_SEPARATOR.'webresource'.DIRECTORY_SEPARATOR.$workspace->getUuid().DIRECTORY_SEPARATOR;
        if (!file_exists($zipPath.$hash)) {
            mkdir($zipPath.$hash, 0777, true);
        }
        $this->getZip()->open($filesPath.$hash);
        $this->getZip()->extractTo($zipPath.$hash);
        $this->getZip()->close();
    }