Add handler for invalid request to message handler

Author: nemanjan00

src/WorkerJS/PHPClient/TaskMessageRequestHandler.php

@@ -8,6 +8,8 @@
 
 namespace WorkerJS\PHPClient;
 
+use WorkerJS\PHPClient\exceptions\InvalidRequestException;
+
 class TaskMessageRequestHandler {
 	private $client;
 
@@ -24,6 +26,10 @@ public function handleRequest(string $body) {
 		$body = json_decode($body);
 		//TODO: Check protocol
 
+		if ($body === null && json_last_error() !== JSON_ERROR_NONE) {
+			throw new InvalidRequestException("Invalid request");
+		}
+
 		$taskID = $body->taskID;
 
 		$task = $this->client->getTaskByID($taskID);

src/WorkerJS/PHPClient/exceptions/InvalidRequestException.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: miljanrakita
+ * Date: 12/25/18
+ * Time: 1:34 AM
+ */
+
+namespace WorkerJS\PHPClient\exceptions;
+
+
+class InvalidRequestException extends \Exception {}
+