Zend 2 redirect() module error - zend-framework2

Question

I have made a checklogin fucntion to check $auth->getIdentity(), but i am getting the following error:
Fatal error: Call to undefined method Admin\Module::redirect() in
C:\xampp\websites\zend2\module\Admin\Module.php on line 51
How can i fix this?
public function onBootstrap(MvcEvent $e)
{
$eventManager = $e->getApplication()->getEventManager();
$moduleRouteListener = new ModuleRouteListener();
$moduleRouteListener->attach($eventManager);
$app = $e->getParam('application');
$app->getEventManager()->attach('render', array($this, 'setLayoutTitle'));
$moduleRouteListener->attach($eventManager);
// add event
$eventManager->attach('render', array($this, 'checklogin'));
}
public function checkLogin()
{
$auth = new AuthenticationService();
if( $auth->getIdentity() == NULL ){
return $this->redirect()->toRoute('/admin/login');
}else{
return $this->redirect()->toRoute('/admin');
}
}

Answer 1

That's because there is no redirect method in Module class.
I suggest move this check in dispatch event, because dispatch event is triggered before the controller action is dispatched.
So you need to change the listener method setting in onBootstrap Module method:
public function onBootstrap(MvcEvent $e)
{
// ...
$eventManager->attach(MvcEvent::EVENT_DISPATCH, array($this, 'checkLogin'));
// ...
}
Then in the listener method you got the MvcEvent where target is matched controller class:
public function checkLogin(MvcEvent $e)
{
$controller = $e->getTarget();
if ($someCondition) {
return $controller->plugin('redirect')->toRoute('your/route/name');
}
}

Answer 2

public function onBootstrap(MvcEvent $e)
{
$eventManager = $e->getApplication()->getEventManager();
$moduleRouteListener = new ModuleRouteListener();
$moduleRouteListener->attach($eventManager);
$app = $e->getParam('application');
$app->getEventManager()->attach('render', array($this, 'setLayoutTitle'));
$eventManager->attach(MvcEvent::EVENT_DISPATCH, array($this, 'checkLogin'));
}
public function checkLogin(MvcEvent $e)
{
$iden = new AuthenticationService();
if( $iden->getIdentity() === NULL ){
$matches = $e->getRouteMatch();
$controller = $matches->getParam('controller');
$getController = explode( '\\', $controller );
if( $getController[2] != 'Login' ){
$controller = $e->getTarget();
return $controller->plugin('redirect')->toRoute('login');
}
}