Improve notification classes and move interface to core

app/Notification/WebhookNotification.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Kanboard\Notification;
+
+use Kanboard\Core\Base;
+use Kanboard\Core\Notification\NotificationInterface;
+
+/**
+ * Webhook Notification
+ *
+ * @package  Kanboard\Notification
+ * @author   Frederic Guillot
+ */
+class WebhookNotification extends Base implements NotificationInterface
+{
+    /**
+     * Send notification to a user
+     *
+     * @access public
+     * @param  array     $user
+     * @param  string    $event_name
+     * @param  array     $event_data
+     */
+    public function notifyUser(array $user, $event_name, array $event_data)
+    {
+    }
+
+    /**
+     * Send notification to a project
+     *
+     * @access public
+     * @param  array     $project
+     * @param  string    $event_name
+     * @param  array     $event_data
+     */
+    public function notifyProject(array $project, $event_name, array $event_data)
+    {
+        $url = $this->config->get('webhook_url');
+        $token = $this->config->get('webhook_token');
+
+        if (! empty($url)) {
+            if (strpos($url, '?') !== false) {
+                $url .= '&token='.$token;
+            } else {
+                $url .= '?token='.$token;
+            }
+
+            $payload = array(
+                'event_name' => $event_name,
+                'event_data' => $event_data,
+            );
+
+            $this->httpClient->postJson($url, $payload);
+        }
+    }
+}