protected function getSignature(): string
    {
        $request = $this->requestStack->getCurrentRequest();
        $signature = substr(md5($request->server->get('HTTP_USER_AGENT')), 0, $this->length);

        return $signature;
    }
protected function getSignature(): string
    {
        $request = $this->requestStack->getCurrentRequest();
        $signature = substr(md5($request->server->get('HTTP_USER_AGENT')), 0, $this->length);

        return $signature;
    }
protected function getSignature ( ) : string { $ request = $ this -> requestStack -> getCurrentRequest ( ) ; $ signature = substr ( md5 ( $ request -> server -> get ( 'HTTP_USER_AGENT' ) ) , 0 , $ this -> length ) ; return $ signature ; }
Get the client signature

@return string
Get the client signature