Add ModifyJsonContentObjectDataEvent

[alexander-bozung]

It would be great to add a ModifyJsonContentObjectDataEvent in order to modify data in \FriendsOfTYPO3\Headless\ContentObject\JsonContentObject. Here is a patch that would add this Event to the current 4.x dev branch.

Subject: [PATCH] Headless v4 + TYPO3 v12: add ModifyJsonContentObjectDataEvent
---
Index: Classes/ContentObject/JsonContentObject.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/Classes/ContentObject/JsonContentObject.php b/Classes/ContentObject/JsonContentObject.php
--- a/Classes/ContentObject/JsonContentObject.php	(revision d5821b400dceaee34264b17c7f3489a5b1841b7d)
+++ b/Classes/ContentObject/JsonContentObject.php	(date 1689667532763)
@@ -25,6 +25,7 @@
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Frontend\ContentObject\AbstractContentObject;
 use TYPO3\CMS\Frontend\ContentObject\ContentDataProcessor;
+use Psr\EventDispatcher\EventDispatcherInterface;

 use function is_array;
 use function strpos;
@@ -47,6 +48,13 @@
         $this->headlessUserInt = GeneralUtility::makeInstance(HeadlessUserInt::class);
     }

+    private EventDispatcherInterface $eventDispatcher;
+
+    public function injectEventDispatcher(EventDispatcherInterface $eventDispatcher): void
+    {
+        $this->eventDispatcher = $eventDispatcher;
+    }
+
     /**
      * Rendering the cObject, JSON
      * @param array $conf Array of TypoScript properties
@@ -69,6 +77,13 @@
             $data = $this->processFieldWithDataProcessing($conf);
         }

+        $event = $this->eventDispatcher->dispatch(
+            new \FriendsOfTYPO3\Headless\Event\ModifyJsonContentObjectDataEvent($conf, $data)
+        );
+        if (!empty($event->getData())) {
+            $data = $event->getData();
+        }
+
         $json = '';

         if (is_array($data)) {
Index: Classes/Event/ModifyJsonContentObjectDataEvent.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/Classes/Event/ModifyJsonContentObjectDataEvent.php b/Classes/Event/ModifyJsonContentObjectDataEvent.php
new file mode 100644
--- /dev/null	(date 1689667797403)
+++ b/Classes/Event/ModifyJsonContentObjectDataEvent.php	(date 1689667797403)
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FriendsOfTYPO3\Headless\Event;
+
+/**
+ * \FriendsOfTYPO3\Headless\Event\ModifyJsonContentObjectDataEvent
+ */
+final class ModifyJsonContentObjectDataEvent
+{
+    public function __construct(
+        private array $conf,
+        private array $data,
+    ) {
+    }
+
+    /**
+     * @return array
+     */
+    public function getConf(): array
+    {
+        return $this->conf;
+    }
+
+    /**
+     * @return array
+     */
+    public function getData(): array
+    {
+        return $this->data;
+    }
+
+    /**
+     * @param array $data
+     */
+    public function setData(array $data): void
+    {
+        $this->data = $data;
+    }
+}

[tmotyl]

@alexander-bozung Can you send it as a PR? It's easier to review there.
Please also elaborate more on the use case you have.