Restructure project layout

api/src/State/ThreadOwnerProcessor.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+use App\Entity\Thread;
+use App\Entity\User;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+
+class ThreadOwnerProcessor implements ProcessorInterface
+{
+    public function __construct(
+        private Security $security,
+        #[Autowire(service: 'api_platform.doctrine.orm.state.persist_processor')]
+        private ProcessorInterface $persistProcessor
+    ) {
+    }
+
+    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): mixed
+    {
+        if ($data instanceof Thread && null === $data->getAuthor()) {
+            $user = $this->security->getUser();
+            if ($user instanceof User) {
+                $data->setAuthor($user);
+            }
+        }
+
+        return $this->persistProcessor->process($data, $operation, $uriVariables, $context);
+    }
+}