[ActivityStreamsTwo] Introduce a structure for data representation in ActivityStreams 2.0

Type factory borrowed from landrok/activitypub

plugins/ActivityStreamsTwo/ActivityStreamsTwo.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Plugin\ActivityStreamsTwo;
+
+use App\Core\Event;
+use App\Core\Modules\Plugin;
+use App\Core\Router\RouteLoader;
+use Plugin\ActivityStreamsTwo\Util\Response\NoteResponse;
+use Plugin\ActivityStreamsTwo\Util\Response\TypeResponse;
+
+class ActivityStreamsTwo extends Plugin
+{
+    public function version(): string
+    {
+        return '0.1.0';
+    }
+
+    public array $accept = [
+        'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+        'application/activity+json',
+        'application/json',
+        'application/ld+json',
+    ];
+
+    /**
+     * @param string            $route
+     * @param array             $accept
+     * @param array             $vars
+     * @param null|TypeResponse $response
+     *
+     * @throws \Exception
+     *
+     * @return bool
+     */
+    public function onRouteInFormat(string $route, array $accept, array $vars, ?TypeResponse &$response = null): bool
+    {
+        if (empty(array_intersect($this->accept, $accept))) {
+            return Event::next;
+        }
+        switch ($route) {
+            case 'note_show':
+                $response = NoteResponse::handle($vars['note']);
+                return Event::stop;
+            default:
+                return Event::next;
+        }
+    }
+
+    /**
+     * This code executes when GNU social creates the page routing, and we hook
+     * on this event to add our action handler for Embed.
+     *
+     * @param $r RouteLoader the router that was initialized.
+     *
+     * @return bool
+     *
+     * public function onAddRoute(RouteLoader $r): bool
+     * {
+     * $r->connect(
+     * 'note_view',
+     * '/note/{id<\d+>}',
+     * [NoteResponse::class, 'handle'],
+     * options: ['accept' => $this->accept]
+     * );
+     * return Event::next;
+     * }*/
+}