App\Providers\UserServiceProvider::extendValidator PHP Method

    private function extendValidator()
    {
        /** @var Validator $validator */
        $validator = $this->app['validator'];
        // 도메인이 생략된 이메일 validation 추가
        $validator->extend('email_prefix', function ($attribute, $value, $parameters) {
            if (!str_contains($value, '@')) {
                $value .= '@test.com';
            }
            return filter_var($value, FILTER_VALIDATE_EMAIL) !== false;
        });
        // 표시이름 validation 추가
        /** @var Closure $displayNameValidate */
        $displayNameValidate = app('config')->get('xe.user.displayName.validate');
        $validator->extend('display_name', function ($attribute, $value, $parameters) use($displayNameValidate) {
            return $displayNameValidate($value);
        });
        $passwordConfig = app('config')->get('xe.user.password');
        $levels = $passwordConfig['levels'];
        $level = $levels[$passwordConfig['default']];
        $validate = $level['validate'];
        $validator->extend('password', function ($attribute, $value, $parameters) use($validate) {
            return $validate($value);
        }, $level['description']);
    }