Yii2 components api/controller

When we wrote API, those controllers need to implement the following feature:

1. return JSON format data

2. sometimes support JSONP format data also.

3. support stupid low version IE

If we set format with Yii2, the low version IE will download the response content as a file.

Yii::$app->response->format = Response::FORMAT_JSON

　　

So I wrote a component for it, any API controller just need to extend it.

namespace api\components;

use Yii;
use yii\web\Response;

class Controller extends \yii\web\Controller
{
    protected $isLowIE;
    protected $callback;

    public function beforeAction($action)
    {
        $this->layout = false;
        $this->callback = Yii::$app->request->get('callback', false);

        $this->isLowIE = (boolean)Yii::$app->request->get('ie', false);

        if (!$this->isLowIE && !$this->callback) {
            Yii::$app->response->format = Response::FORMAT_JSON;
        }

        return parent::beforeAction($action);
    }

    /**
     * @param \yii\base\Action $action
     * @param mixed $result
     * @return mixed
     */
    public function afterAction($action, $result)
    {
        $result = parent::afterAction($action, $result);
        // your custom code here
        if ($this->isLowIE || $this->callback) {
            $result = json_encode($result);

            if ($this->callback) {
                $result = $this->callback .'('. $result .')';
            }
        }
        return $result;
    }
}