Eel Helper to get the username of the currently logged in user

Some.fusion

prototype(...) {
  userName = ${VIVOMEDIA.FrontendLoginUser.getParty().name}
}

UserHelper.php

<?php
namespace VIVOMEDIA\FrontendLogin\Eel\Helper;


use Neos\Eel\ProtectedContextAwareInterface;
use Neos\Flow\Annotations as Flow;
use Neos\Flow\Security\Context;
use Neos\Party\Domain\Service\PartyService;

class UserHelper implements ProtectedContextAwareInterface {

    /**
     * @Flow\Inject
     * @var Context
     */
    protected $securityContext;

    /**
     * @Flow\Inject
     * @var PartyService
     */
    protected $partyService;

    /**
     * Get the Party
     *
     * @return null|\Neos\Party\Domain\Model\AbstractParty
     */
    public function getParty() {
        if ($this->securityContext->canBeInitialized()) {
            $account = $this->securityContext->getAccount();
            if($account) {
                return $this->partyService->getAssignedPartyOfAccount($account);
            }
        }
        return null;
    }

    /**
     * @param string $methodName
     * @return boolean
     */
    public function allowsCallOfMethod($methodName)
    {
        return true;
    }
}