Prefill address fields for Frontend user

The billing address during the checkout can be prefilled for a logged-in Frontend user. You have to register a EventListener which listens to the event Extcode\Cart\Event\Cart\BeforeShowCartEvent.

The following snippets show an example:

EXT:cartintegration/Classes/EventListener/BeforeShowCart.php 
<?php

declare(strict_types=1);

namespace Vendor\Cartintegration\EventListener\Cart;

use Extcode\Cart\Event\Cart\BeforeShowCartEvent;
use TYPO3\CMS\Frontend\Authentication\FrontendUserAuthentication;

final class BeforeShowCart
{
    public function __invoke(BeforeShowCartEvent $event): void
    {
        $frontendUser = $this->getFrontendUserAuthenticationFromRequest();

        // Hint: The property `user` is marked as internal but it works.
        if (!$frontendUser->user) return;

        $billingAddress = $event->getBillingAddress();

        if ($billingAddress !== null) {
            $billingAddress->setFirstName($frontendUser->user['first_name'] ?? '');
            $billingAddress->setLastName($frontendUser->user['last_name'] ?? '');
            $billingAddress->setEmail($frontendUser->user['email'] ?? '');
            $billingAddress->setStreet($frontendUser->user['address'] ?? '');
            $billingAddress->setZip($frontendUser->user['zip'] ?? '');
            $billingAddress->setCity($frontendUser->user['city'] ?? '');

            // Default to Germany if no country stored in database
            $billingAddress->setCountry($frontendUser->user['country'] ?? 'DE');
        }
    }

    private function getFrontendUserAuthenticationFromRequest(): FrontendUserAuthentication
    {
        $request = $GLOBALS['TYPO3_REQUEST'];
        return $request->getAttribute('frontend.user');
    }
}
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EXT:cartintegration/Configuration/Services.yaml 
services:
  _defaults:
    autowire: true
    autoconfigure: true
    public: false

  Vendor\Cartintegration\:
    resource: '../Classes/*'
    exclude: '../Classes/Domain/Model/*'

  Vendor\Cartintegration\EventListener\Cart\BeforeShowCart:
    tags:
      - name: event.listener
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