Setup to allow creating snipped from API

src/Controller/Api/ExtensionController.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Controller\Api;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Contracts\Cache\CacheInterface;
+
+class ExtensionController extends AbstractApiController
+{
+    #[Route('/content', methods: ['POST'])]
+    public function setContent(
+        Request $request,
+        CacheInterface $cache,
+    ): Response {
+        // Parse JSON payload
+        $data = json_decode($request->getContent(), true);
+        if (!$data || !isset($data['html'])) {
+            return $this->errorResponse('Invalid JSON payload: Missing html parameter');
+        }
+        $html = $data['html'];
+
+        // Store HTML in cache with unique key
+        $userId = $this->getUser()?->getId();
+        $cacheKey = 'html_' . $userId . '_' . bin2hex(random_bytes(8));
+        $cache->get($cacheKey, function () use ($html) {
+            // value to cache
+            return $html;
+        });
+
+        // Build URL to redirect user to a form page later
+        $formUrl = $this->generateUrl(
+            'snip_new',
+            ['cacheKey' => $cacheKey],
+            UrlGeneratorInterface::ABSOLUTE_URL
+        );
+
+        return $this->successResponse(['url' => $formUrl]);
+    }
+}