feat(nodeinfo2): add .well-known route for nodeinfo2 containing metadata about the castopod instance

modules/Fediverse/Controllers/NodeInfo2Controller.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright  2021 Podlibre
+ * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
+ * @link       https://castopod.org/
+ */
+
+namespace Modules\Fediverse\Controllers;
+
+use CodeIgniter\Controller;
+use CodeIgniter\HTTP\ResponseInterface;
+
+class NodeInfo2Controller extends Controller
+{
+    public function index(): ResponseInterface
+    {
+        $totalUsers = model('ActorModel')
+            ->getTotalLocalActors();
+        $totalPosts = model('PostModel')
+            ->getTotalLocalPosts();
+        $activeMonth = model('ActorModel')
+            ->getActiveLocalActors(1);
+        $activeHalfyear = model('ActorModel')
+            ->getActiveLocalActors(6);
+
+        $nodeInfo2 = [
+            'version' => '1.0',
+            'server' => [
+                'baseUrl' => base_url(),
+                'name' => service('settings')
+                    ->get('App.siteName'),
+                'software' => 'Castopod Host',
+                'version' => CP_VERSION,
+            ],
+            'protocols' => ['activitypub'],
+            'openRegistrations' => config('Auth')
+                ->allowRegistration,
+            'usage' => [
+                'users' => [
+                    'total' => $totalUsers,
+                    'activeMonth' => $activeMonth,
+                    'activeHalfyear' => $activeHalfyear,
+                ],
+                'localPosts' => $totalPosts,
+            ],
+        ];
+
+        return $this->response->setJSON($nodeInfo2);
+    }
+}