public function authenticate(Request $request, VendingMachine $vendingMachine)
 {
     if (!$request->query->has('login') || !$request->query->has('password')) {
         return FALSE;
     }
     if ($vendingMachine->getLogin() !== $request->query->get('login')) {
         return FALSE;
     }
     if (!$this->_passwordEncoder->isPasswordValid($request->query->get('password'), $vendingMachine->getPassword())) {
         return FALSE;
     }
     return TRUE;
 }