Change get body to works with Octane

src/SNSController.php

@@ -27,7 +27,7 @@ public function callback(Request $request)
             // for SNSMessage we have to pass the json data in $request->message
             $message = new SNSMessage(json_decode($request->message, true));
         } else {
-            $message = SNSMessage::fromRawPostData();
+            $message = $this->fromJsonString($request);
             $validator = app(SNSMessageValidator::class);
             $validator->validate($message);
         }
@@ -44,6 +44,23 @@ public function callback(Request $request)
         }
     }
 
+    /**
+     * @param \Illuminate\Http\Request $request
+     * @return \Aws\Sns\Message
+     */
+    private function fromJsonString(Request $request)
+    {
+        // get body from request
+        $body = $request->getContent();
+
+        // Make sure the SNS-provided header exists.
+        if (!isset($_SERVER['HTTP_X_AMZ_SNS_MESSAGE_TYPE'])) {
+            throw new \RuntimeException('SNS message type header not provided.');
+        }
+
+        return SNSMessage::fromJsonString($body);
+    }
+
     protected function confirm_subscription($message)
     {
         $client = new Guzzle();