ZF2 register custom helper for navigation

Question

I am using Zend Navigation with ACL. My users can have multiple roles, which have no relation to each other, but Zend Navigation only accepts one role and checks the ACL with that role which is not good for me.

How can I register a new Helper for the Navigation such that I can override the acceptAcl method. I tried to create and register a simple view helper but that didn't work

class Menu extends \Zend\View\Helper\Navigation\Menu implements \Zend\ServiceManager\ServiceLocatorAwareInterface
{

    protected function acceptAcl(AbstractPage $page)
    {
        if (!$acl = $this->getAcl()) {
            // no acl registered means don't use acl
            return true;
        }

        $userIdentity = $this->getServiceLocator()->get('user_identity');
        $resource = $page->getResource();
        $privilege = $page->getPrivilege();

        $allowed = true;
        if ($userIdentity->id !== "1") {

            if ($acl->hasResource($resource)) {
                $allowed = false;
                foreach ($userIdentity->rolls as $roll) {
                    if ($acl->isAllowed($roll['id'], $resource)) {
                        $allowed = true;
                        continue;
                    }
                }
            }
        }

        return $allowed;
    }

    public function renderMenu($container = null, array $options = array())
    {
        return 'this is my menu';
    }

}

'view_helpers' => array(
    'invokables' => array(
        'myMenu' => 'Application\View\Helper\Menu',
    ),
),

How can I register this helper so that the Navigation knows about it?

Answer 1

The Navigation view helper is registered on the ViewHelperPluginManager. All the navigation helpers (Menu, Breadcrumbs etc) are managed by a seperate pluginmanager. As far as I know you cannot overwrite the navigation helpers in your configuration yet.

Try to add the following to your Module.php:

class Module
{
    public function onBootstrap($e)
    {
        $application = $e->getApplication();
        /** @var $serviceManager \Zend\ServiceManager\ServiceManager */
        $serviceManager = $application->getServiceManager();

        $pm = $serviceManager->get('ViewHelperManager')->get('Navigation')->getPluginManager();
        $pm->setInvokableClass('myMenu', '\Application\View\Helper\Menu');
    }
}

Answer 2

Even if the topic is old, that solution didn't work for me in ZF2 v2.3.3.

After some research, I found that Navigation Helper is not shared, or it is the twig module that mess up sharing, and if I try to add custom plugin to Navigation (such as a new menu) in module bootstrap, it is just ineffective. But I found an interesting thing in reading Navigation Helper construction in

Zend\Navigation\View\HelperConfig.php

the Navigation plugin manager can be configured in module, global or local config under the key navigation_helpers. That is an easy way to extends Navigation with plugins.

Ex :

module.config.php

'navigation_helpers' => array (
    'invokables' => array(
        'menu' => 'Application\View\Helper\Navigation\Menu',
    ),
),