Во первых, при валидации сделайте поле имени пользователя обязательным, и латиницей. Думаю, это логично.
Далее, в AuthController добавьте функцию:
public function postLogin(Request $request)
{
$this->validate($request, [
$this->loginUsername() => 'required', 'password' => 'required',
]);
// 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.
$throttles = $this->isUsingThrottlesLoginsTrait();
if ($throttles && $this->hasTooManyLoginAttempts($request)) {
return $this->sendLockoutResponse($request);
}
$credentials = $this->getCredentials($request);
$login = $request->input($this->loginUsername());
$field = filter_var($login, FILTER_VALIDATE_EMAIL) ? 'email':'username';
$request->merge([$field => $login]);
$credentials = $request->only($field, 'password');
if (Auth::attempt($credentials, $request->has('remember'))) {
return $this->handleUserWasAuthenticated($request, $throttles);
}
// If the login attempt was unsuccessful we will increment the number of attempts
// to login and redirect the user back to the login form. Of course, when this
// user surpasses their maximum number of attempts they will get locked out.
if ($throttles) {
$this->incrementLoginAttempts($request);
}
return redirect($this->loginPath())
->withInput($request->only($this->loginUsername(), 'remember'))
->withErrors([
$this->loginUsername() => $this->getFailedLoginMessage(),
]);
}
UPD: Сделал более актуальный и правильный вариант благодаря ответу
JhaoDa