laravel 5.3自带的auth，登录方法改写问题

由于laravel 5.3自带的auth没有邮件激活的机制，需要增加邮件激活，所以对它进行了一点改写：

laravel 5.3自带的auth的login方法原本是这样的：

    public function login(Request $request)
    {
        $this->validateLogin($request);

        // If the class is using the ThrottlesLogins trait, we can automatically throttle
        // the login attempts for this application. We'll key this by the username and
        // the IP address of the client making these requests into this application.
        if ($this->hasTooManyLoginAttempts($request)) {
            $this->fireLockoutEvent($request);

            return $this->sendLockoutResponse($request);
        }

        $credentials = $this->credentials($request);

       //问题是关于这个if判断。
        if ($this->guard()->attempt($credentials, $request->has('remember'))) {
            return $this->sendLoginResponse($request);
        }

        // If the login attempt was unsuccessful we will increment the number of attempts
        // to login and redirect the user back to the login form. Of course, when this
        // user surpasses their maximum number of attempts they will get locked out.
        $this->incrementLoginAttempts($request);

        return $this->sendFailedLoginResponse($request);
    }

问题在上面if（）判断那里。

改写描述：
在user表中用is_confirmed字段来表示帐号是否激活，0代表未激活，1代表已激活，激活才能登陆。

如果帐号没激活，在视图中单独显示帐号没有激活，而不是笼统的显示帐号或密码不对,或帐号没激活，所以把原本的代码改成了这样：(只改了if语句那里)

if($this->guard()->attempt($credentials)){

            if ($this->guard()->attempt(array_merge($credentials,['is_confirmed'=>1]), $request->has('remember'))) {

                return $this->sendLoginResponse($request);

            }elseif($this->guard()->attempt(array_merge($credentials,['is_confirmed'=>0]), $request->has('remember'))){
                
                \Session::flash('email_not_confirmed','帐号没有激活，无法登录，请先去您的邮箱激活帐号');

                return back()->withInput($request->only($this->username(), 'remember'));
            }
        }

问题：
感觉我的代码逻辑有点重复，有其他更优化的写法吗？