How to use authorizationChecker inside a trait

Question

I have a trait that checks if a user is logged in or not and number of attempts to a specific location.

This trait I am trying to use inside a FormType in order to display a captcha after a number of attempts.

Inside getIpOrUserId() I am trying to check if user is logged in $this->get('security.authorization_checker')->isGranted('IS_AUTHENTICATED_FULLY') but it returns an error Attempted to call an undefined method named "get" of class.

I don't think that it is possible to create a Trait as a Service so I can inject the security object.

Is there a way to achieve this?

Trait

<?php

Trait CheckAttempts {

public function getTryAttempts()
{
    if ($this->getIpOrUserId() == null) {
        return false;
    } else {
        $attempts = $this->getDoctrine()
            ->getRepository('SiteBundle:LoginAttempts')
            ->findOneByIpOrUserId($this->getIpOrUserId());
    }

    return $attempts->getAttempts();
}

protected function getIpOrUserId()
{
     //get logged in user
    //if ($this->authorizationChecker->isGranted('IS_AUTHENTICATED_FULLY')) {
      if ($this->get('security.authorization_checker')->isGranted('IS_AUTHENTICATED_FULLY')) {
        $ipOrUserId = $this->get('security.token_storage')->getToken()->getUser()->getId();            
    } else {
        $ipOrUserId = $this->container->get('request_stack')->getCurrentRequest()->getClientIp();
    }
    return $ipOrUserId;
}

FormType

class RegisterType extends AbstractType
{

use FormSendLimitTrait;

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {

    $form = $event->getForm();
    var_dump($this->getTryAttempts());

    $form->add('captcha', 'captcha', 
          'label' => 'site.captcha'
    ]);

    /*if ($attempts->getAttempts() > 6) {
        $form->add('captcha', 'captcha', [
            'label' => 'site.captcha'
        ]);
    }*/
})

Answer 1

get method works only if you extend Symfony\Bundle\FrameworkBundle\Controller\Controller class, usually it is used inside your controller classes. And it returns only $this->container->get($id), nothing else, this means it returns Symfony\Component\DependencyInjection\Container class. You should inject security.authorization_checker service into your class (or other services which you want), or even whole service_container service (but it's not recommended).

Example:

class MyClass
{
    private $securityChecker;

    public function __construct(Symfony\Component\Security\Core\Authorization\AuthorizationChecker $securityChecker)
    {
        $this->securityChecker = $securityChecker;
    }

    ...
}

services.yml

services:
    my_class_service:
        class: Acme\DemoBundle\MyClass
        arguments: 
           - @security.authorization_checker

But in your case you should not use traits like you're doing.