Allow a POST request to have an empty body

Author: Rodrigue Villetard

src/EventListener/DeserializeListener.php

@@ -47,12 +47,16 @@ public function __construct(SerializerInterface $serializer, SerializerContextBu
     public function onKernelRequest(GetResponseEvent $event)
     {
         $request = $event->getRequest();
+        $method = $request->getMethod();
         if (
             $request->isMethodSafe(false)
-            || $request->isMethod('DELETE')
+            || 'DELETE' === $method
             || !($attributes = RequestAttributesExtractor::extractAttributes($request))
             || !$attributes['receive']
-            || ('' === ($requestContent = $request->getContent()) && $request->isMethod('PUT'))
+            || (
+                    '' === ($requestContent = $request->getContent())
+                    && ('POST' === $method || 'PUT' === $method)
+               )
         ) {
             return;
         }

tests/EventListener/DeserializeListenerTest.php

@@ -47,12 +47,15 @@ public function testDoNotCallWhenRequestMethodIsSafe()
         $listener->onKernelRequest($eventProphecy->reveal());
     }
 
-    public function testDoNotCallWhenPutAndEmptyRequestContent()
+    /**
+     * @dataProvider allowedEmptyRequestMethodsProvider
+     */
+    public function testDoNotCallWhenSendingAndEmptyRequestContent($method)
     {
         $eventProphecy = $this->prophesize(GetResponseEvent::class);
 
         $request = new Request([], [], ['data' => new \stdClass(), '_api_resource_class' => 'Foo', '_api_item_operation_name' => 'put'], [], [], [], '');
-        $request->setMethod('PUT');
+        $request->setMethod($method);
         $request->headers->set('Content-Type', 'application/json');
         $eventProphecy->getRequest()->willReturn($request)->shouldBeCalled();
 
@@ -66,6 +69,11 @@ public function testDoNotCallWhenPutAndEmptyRequestContent()
         $listener->onKernelRequest($eventProphecy->reveal());
     }
 
+    public function allowedEmptyRequestMethodsProvider()
+    {
+        return [['PUT'], ['POST']];
+    }
+
     public function testDoNotCallWhenRequestNotManaged()
     {
         $eventProphecy = $this->prophesize(GetResponseEvent::class);