Add authorization strategy for WAMP topics

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

@@ -0,0 +1,63 @@
+<?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;
+use Psr\Log\LoggerInterface;
+use React\EventLoop\LoopInterface;
+use React\ZMQ\Context;
+
+class TaskManagerSubscriberPlugin implements PluginInterface
+{
+    private $logger;
+    private $pull;
+
+    public function __construct($options, LoopInterface $loop, LoggerInterface $logger)
+    {
+        $this->logger = $logger;
+        $context = new Context($loop);
+
+        $this->pull = $context->getSocket(\ZMQ::SOCKET_SUB);
+        $this->pull->setSockOpt(\ZMQ::SOCKOPT_SUBSCRIBE, "");
+        $this->pull->connect(sprintf('%s://%s:%s', $options['protocol'], $options['host'], $options['port']));
+
+        $this->pull->on('error', function ($e) use ($logger) {
+            $logger->error('TaskManager Subscriber received an error.', ['exception' => $e]);
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function attach(TopicsManager $manager)
+    {
+        $this->pull->on('message', function ($msg) use ($manager) {
+            $data = @json_decode($msg, true);
+
+            if (json_last_error() !== JSON_ERROR_NONE) {
+                $this->logger->error(sprintf('[WS] Received invalid message %s : invalid json', $msg));
+
+                return;
+            }
+
+            if (!isset($data['topic'])) {
+                $this->logger->error(sprintf('[WS] Received invalid message %s : no topic', $msg));
+
+                return;
+            }
+
+            $this->logger->debug(sprintf('[WS] Received message %s', $msg));
+
+            $manager->broadcast($data['topic'], json_encode($msg));
+        });
+    }
+}