Add validation to prevent invalid ports, closes #1034

app/Exceptions/Service/Allocation/InvalidPortMappingException.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Pterodactyl\Exceptions\Service\Allocation;
+
+use Pterodactyl\Exceptions\DisplayException;
+
+class InvalidPortMappingException extends DisplayException
+{
+    /**
+     * InvalidPortMappingException constructor.
+     *
+     * @param mixed $port
+     */
+    public function __construct($port)
+    {
+        parent::__construct(trans('exceptions.allocations.invalid_mapping', ['port' => $port]));
+    }
+}