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Creating Your Own Expression Function

New in version 1.3: @DI\SecurityFunction was added.

Even though the built-in expressions allow you to do a lot already, there are cases where you want to add a custom expression function.

Let?s assume that you want to check that a user has a certain IP, you could do that using this expression container.get("request").getIp() == "". However, if you duplicate this on several actions, it becomes a lot to write. Also, what happens if you want to add another IP? You would have to edit all the places where this expression is used. So instead of the above expression, let?s add another function isLocalUser() which you can use in your expressions.


namespace Acme\DemoBundle\Security;

use Symfony\Component\DependencyInjection\ContainerInterface;
use JMS\DiExtraBundle\Annotation as DI;

/** @DI\Service */
class RequestAccessEvaluator
    private $container;

     * @DI\InjectParams({
     *     "container" = @DI\Inject("service_container"),
     * })
    public function __construct(ContainerInterface $container)
        $this->container = $container;

    /** @DI\SecurityFunction("isLocalUser") */
    public function isLocalUser()
        return $this->container->get('request')->getClientIp() === '';
Note: If you are using annotations to set-up the service (@DI\Service) make sure that the path of your file is scanned by JMSDiExtraBundle. For more information, please see the JMSDiExtraBundle configuration.