Add authorization strategy for WAMP topics

lib/Alchemy/Phrasea/Websocket/Topics/Plugin/PluginInterface.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2014 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\Websocket\Topics\Plugin;
+
+use Alchemy\Phrasea\Websocket\Topics\TopicsManager;
+
+interface PluginInterface
+{
+    /**
+     * Attaches a Plugn to the TopicsManager
+     *
+     * @param TopicsManager $manager
+     */
+    public function attach(TopicsManager $manager);
+}