[NOTE] Add route and controller

src/Controller/Note.php

@@ -0,0 +1,57 @@
+<?php
+
+// {{{ License
+
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+
+// }}}
+
+namespace App\Controller;
+
+use App\Core\Controller;
+use App\Core\DB\DB;
+use function App\Core\I18n\_m;
+use App\Util\Exception\ClientException;
+use Symfony\Component\HttpFoundation\Request;
+
+class Note extends Controller
+{
+    /**
+     * Generic function that handles getting a representation for a note
+     */
+    private function note(int $id, callable $handle)
+    {
+        $note = DB::findOneBy('note', ['id' => $id]);
+        if (empty($note)) {
+            throw new ClientException(_m('No such note'), 404);
+        } else {
+            return $handle($note);
+        }
+    }
+
+    /**
+     * The page where the note and it's info is shown
+     */
+    public function note_show(Request $request, int $id)
+    {
+        return $this->note($id, function ($note) use ($id) {
+            return [
+                '_template' => 'note/view.html.twig',
+                'note'      => $note,
+            ];
+        });
+    }
+}

src/Routes/Note.php

@@ -0,0 +1,45 @@
+<?php
+
+// {{{ License
+
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+
+// }}}
+
+/**
+ * Define social's attachment routes
+ *
+ * @package  GNUsocial
+ * @category Router
+ *
+ * @author    Diogo Cordeiro <mail@diogo.site>
+ * @author    Hugo Sales <hugo@hsal.es>
+ * @copyright 2020-2021 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
+
+namespace App\Routes;
+
+use App\Controller as C;
+use App\Core\Router\RouteLoader;
+
+abstract class Note
+{
+    public static function load(RouteLoader $r): void
+    {
+        $r->connect('note_view', '/note/{id<\d+>}', [C\Note::class, 'note_show']);
+    }
+}