Refactor auth controllers to be cleaner and easier to maintain

app/Http/Controllers/Auth/LoginCheckpointController.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Pterodactyl\Http\Controllers\Auth;
+
+use Illuminate\Http\JsonResponse;
+use Pterodactyl\Http\Requests\Auth\LoginCheckpointRequest;
+use Pterodactyl\Exceptions\Repository\RecordNotFoundException;
+
+class LoginCheckpointController extends AbstractLoginController
+{
+    /**
+     * Handle a login where the user is required to provide a TOTP authentication
+     * token. In order to add additional layers of security, users are not
+     * informed of an incorrect password until this stage, forcing them to
+     * provide a token on each login attempt.
+     *
+     * @param \Pterodactyl\Http\Requests\Auth\LoginCheckpointRequest $request
+     * @return \Illuminate\Http\JsonResponse
+     *
+     * @throws \Pterodactyl\Exceptions\DisplayException
+     */
+    public function index(LoginCheckpointRequest $request): JsonResponse
+    {
+        try {
+            $cache = $this->cache->pull($request->input('confirmation_token'), []);
+            $user = $this->repository->find(array_get($cache, 'user_id', 0));
+        } catch (RecordNotFoundException $exception) {
+            return $this->sendFailedLoginResponse($request);
+        }
+
+        if (! array_get($cache, 'valid_credentials') || array_get($cache, 'request_ip') !== $request->ip()) {
+            return $this->sendFailedLoginResponse($request, $user);
+        }
+
+        if (! $this->google2FA->verifyKey(
+            $this->encrypter->decrypt($user->totp_secret),
+            $request->input('authentication_code'),
+            config('pterodactyl.auth.2fa.window')
+        )) {
+            return $this->sendFailedLoginResponse($request, $user);
+        }
+
+        $this->authManager->guard()->login($user, true);
+
+        return $this->sendLoginResponse($request);
+    }
+}