Layout redirect in zend Framework 2 - authentication

Question

Is it possible to redirect to a route in Layout.phtml in ZF2. I want to redirect to login page if the user is not logged in from layout.phtml
So far i have tried:
<?php $auth = new AuthenticationService();
if ($auth->hasIdentity()) {?>
<li class="active"><a href="<?php echo $this->url('home') ?>">
<?php echo $this->translate('Home') ?></a></li>
<li class="active"><?php echo $this->translate('Logout') ?></li>
<?php
}
else
{
$this->_forward('login/process');
} ?>
its giving me error "get was unable to fetch or create an instance for _forward"
BOOTSTRAP CODE:
public function onBootstrap(MvcEvent $e)
{
$e->getApplication()->getServiceManager()->get('translator');
$eventManager = $e->getApplication()->getEventManager();
$moduleRouteListener = new ModuleRouteListener();
$moduleRouteListener->attach($eventManager);
$eventManager = $e->getApplication()->getEventManager();
//nothing's available for non logged user, so redirect him to login page
$eventManager->attach("dispatch", function($e) {
$match = $e->getRouteMatch();
$list = $this->whitelist;
// Route is whitelisted
$name = $match->getMatchedRouteName();
if (in_array($name, $list)) {
return;
}
$sm = $e->getApplication()->getServiceManager();
$controller = $e->getTarget();
$auth = $sm->get('AuthService');
if (!$auth->hasIdentity() && $e->getRouteMatch()->getMatchedRouteName() !== 'login/process') {
$application = $e->getTarget();
$e->stopPropagation();
$response = $e->getResponse();
$response->setStatusCode(302);
$response->getHeaders()->addHeaderLine('Location', $e->getRouter()->assemble(array(), array('name' => 'login/process')));
//returning response will cause zf2 to stop further dispatch loop
return $response;
}
}, 100);
}

Answer 1

This is not something that you wanna be doing inside your layout.phtml. Typically you want to hook in to an event that happens before the rendering. In ZF2, the earliest event to hook into that kind of stuff, where it makes sense to hook into, would be the route event. A good diagram of the process that's used in the Authorization-Module BjyAuthorize explains it quite well:
If you don't want to use the Module, you can minify what's happening there, too, like this:
//class Module
public function onBootstrap(MvcEvent $mvcEvent)
{
$eventManager = $mvcEvent->getApplication()->getEventManager();
$eventManager->attach(MvcEvent::EVENT_ROUTE, array($this, 'onRoute'), -1000);
}
public function onRoute(MvcEvent $event)
{
$serviceLocator = $mvcEvent->getApplication()->getServiceLocator();
// From this point onwards you have access to the ServiceLocator and can check
// for an authenticated user and if the user is not logged in, you return a
// Response object with the appropriate ResponseCode redirected and that's it :)
}