🐛 Fix request content check edge case

Looks like ->request->all() (parameter bag) was returning a non empty paramater bag
(with content copied inside it for example).

That's no more the case with recent symfony releases.

Checking the real content of the request body instead as it should have been done.

Author: shouze

src/JsonBodyListener.php

@@ -21,16 +21,11 @@ public function __construct(PayloadValidator $payloadValidator)
     public function onKernelRequest(GetResponseEvent $event)
     {
         $request = $event->getRequest();
-        $method = $request->getMethod();
-
-        if (count($request->request->all())
-            || !in_array($method, ['POST', 'PUT', 'PATCH', 'DELETE', 'LINK', 'UNLINK'])
-        ) {
+        if (!in_array($request->getMethod(), ['POST', 'PUT', 'PATCH', 'DELETE', 'LINK', 'UNLINK'])) {
             return;
         }
 
         $contentType = $request->headers->get('Content-Type');
-
         $format = null === $contentType
             ? $request->getRequestFormat()
             : $request->getFormat($contentType);
@@ -40,20 +35,20 @@ public function onKernelRequest(GetResponseEvent $event)
         }
 
         $content = $request->getContent();
+        if (empty($content)) {
+            return;
+        }
 
-        if (!empty($content)) {
-            $data = @json_decode($content, true);
-
-            if (!is_array($data)) {
-                throw new BadRequestHttpException('Invalid ' . $format . ' message received');
-            }
-
-            $jsonSchema = $request->get('_jsonSchema');
-            if (is_array($jsonSchema) && array_key_exists('request', $jsonSchema)) {
-                $this->payloadValidator->validate($content, $jsonSchema['request']);
-            }
+        $data = @json_decode($content, true);
+        if (!is_array($data)) {
+            throw new BadRequestHttpException('Invalid ' . $format . ' message received');
+        }
 
-            $request->request = new ParameterBag($data);
+        $jsonSchema = $request->get('_jsonSchema');
+        if (is_array($jsonSchema) && array_key_exists('request', $jsonSchema)) {
+            $this->payloadValidator->validate($content, $jsonSchema['request']);
         }
+
+        $request->request = new ParameterBag($data);
     }
 }