feat(demo): add story 1 — Sorano: Rock and Time

plugins/api/classes/Api/Middleware/JsonBodyParserMiddleware.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Grav\Plugin\Api\Middleware;
+
+use Grav\Plugin\Api\Exceptions\ValidationException;
+use Psr\Http\Message\ServerRequestInterface;
+
+class JsonBodyParserMiddleware
+{
+    public function processRequest(ServerRequestInterface $request): ServerRequestInterface
+    {
+        $contentType = $request->getHeaderLine('Content-Type');
+
+        if (!str_contains($contentType, 'application/json')) {
+            return $request;
+        }
+
+        $body = (string) $request->getBody();
+        if ($body === '') {
+            return $request->withAttribute('json_body', []);
+        }
+
+        $decoded = json_decode($body, true);
+        if (json_last_error() !== JSON_ERROR_NONE) {
+            throw new ValidationException('Invalid JSON in request body: ' . json_last_error_msg());
+        }
+
+        return $request->withAttribute('json_body', $decoded);
+    }
+}