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Authenticating a user with multiple user providers

Symfony provides native support for multiple user providers. This makes it easy to integrate any kind of login handlers, including SSO and existing third party bundles (e.g. FR3DLdapBundleHWIOauthBundleFOSUserBundleBeSimpleSsoAuthBundle, etc.).

However, to be able to use external user providers with eZ Platform, a valid Platform user needs to be injected into the repository. This is mainly for the kernel to be able to manage content-related permissions (but not limited to this).

Depending on your context, you will either want to create a Platform user, return an existing user, or even always use a generic user.

Whenever an external user is matched (i.e. one that does not come from Platform repository, like coming from LDAP), eZ Platform kernel fires an MVCEvents::INTERACTIVE_LOGIN event. Every service listening to this event will receive an eZ\Publish\Core\MVC\Symfony\Event\InteractiveLoginEvent object which contains the original security token (that holds the matched user) and the request.

It's then up to the listener to retrieve a Platform user from the repository and to assign it back to the event object. This user will be injected into the repository and used for the rest of the request.

If no eZ Platform user is returned, the Anonymous User will be used.

User exposed and security token

When an external user is matched, a different token will be injected into the security context, the InteractiveLoginToken. This token holds a UserWrapped instance which contains the originally matched user and the API user (the one from the eZ Platform repository).

Note that the API user is mainly used for permission checks against the repository and thus stays under the hood.

Customizing the User class

It is possible to customize the user class used by extending ezpublish.security.login_listener service, which defaults to eZ\Publish\Core\MVC\Symfony\Security\EventListener\SecurityListener.

You can override getUser() to return whatever User class you want, as long as it implements eZ\Publish\Core\MVC\Symfony\Security\UserInterface.

Example

Here is a very simple example using the in-memory user provider.

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# app/config/security.yml
security:
    providers:
        # Chaining in_memory and ezpublish user providers
        chain_provider:
            chain:
                providers: [in_memory, ezpublish]
        ezpublish:
            id: ezpublish.security.user_provider
        in_memory:
            memory:
                users:
                    # You will then be able to login with username "user" and password "userpass"
                    user:  { password: userpass, roles: [ 'ROLE_USER' ] }
    # The "in memory" provider requires an encoder for Symfony\Component\Security\Core\User\User
 encoders:
        Symfony\Component\Security\Core\User\User: plaintext

Implementing the listener

In services.yml in your AcmeExampleBundle:

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parameters:
    acme_example.interactive_event_listener.class: Acme\ExampleBundle\EventListener\InteractiveLoginListener

services:
    acme_example.interactive_event_listener:
        class: %acme_example.interactive_event_listener.class%
        arguments: [@ezpublish.api.service.user]
        tags:
            - { name: kernel.event_subscriber } 

Do not mix MVCEvents::INTERACTIVE_LOGIN event (specific to eZ Platform) and SecurityEvents::INTERACTIVE_LOGIN event (fired by Symfony security component)

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<?php
namespace Acme\ExampleBundle\EventListener;

use eZ\Publish\API\Repository\UserService;
use eZ\Publish\Core\MVC\Symfony\Event\InteractiveLoginEvent;
use eZ\Publish\Core\MVC\Symfony\MVCEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class InteractiveLoginListener implements EventSubscriberInterface
{
    /**
     * @var \eZ\Publish\API\Repository\UserService
     */
    private $userService;

    public function __construct( UserService $userService )
    {
        $this->userService = $userService;
    }

    public static function getSubscribedEvents()
    {
        return [
            MVCEvents::INTERACTIVE_LOGIN => 'onInteractiveLogin'
        ];
    }

    public function onInteractiveLogin( InteractiveLoginEvent $event )
    {
        // This loads a generic user and assigns it back to the event.
        // You may want to create users here, or even load predefined users depending on your own rules.
        $event->setApiUser( $this->userService->loadUserByLogin( 'lolautruche' ) );
    }
} 
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