Yii2 API Auth with username and password

BaseController.php

<?php
/**
 * 
 * 
 * @author Carsten Brandt <mail@cebe.cc>
 */

namespace api\components;

use common\models\ApiSystem;
use yii\filters\AccessControl;
use yii\filters\auth\HttpBasicAuth;
use yii\filters\ContentNegotiator;
use yii\filters\RateLimiter;
use yii\rest\Controller;
use yii\web\Response;
use Yii;

/**
 * Base class for all API Controllers
 */
abstract class BaseController extends Controller
{
	public function behaviors()
	{
		return [
			'contentNegotiator' => [
				'class' => ContentNegotiator::className(),
				'formats' => [
					'application/json' => Response::FORMAT_JSON,
				],
			],
			'authenticator' => [
				'class' => HttpBasicAuth::className(),
				'auth' => function ($username, $password) {
					Yii::info("system attempts to login with '$username' and token '$password'", 'auth');
					return User::find()->active()->andWhere([
						'system_id' => $username,
						'auth_token' => $password,
					])->one();
				}
			],
		];
	}
}