Block API access when 2FA is required on account; closes #2791

app/Exceptions/Http/TwoFactorAuthRequiredException.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Pterodactyl\Exceptions\Http;
+
+use Throwable;
+use Illuminate\Http\Response;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
+
+class TwoFactorAuthRequiredException extends HttpException implements HttpExceptionInterface
+{
+    /**
+     * TwoFactorAuthRequiredException constructor.
+     *
+     * @param \Throwable|null $previous
+     */
+    public function __construct(Throwable $previous = null)
+    {
+        parent::__construct(Response::HTTP_BAD_REQUEST, "Two-factor authentication is required on this account in order to access this endpoint.", $previous);
+    }
+}