CoreApi: one more trait, for CoreApi functionality

library/Director/Web/Controller/Extension/CoreApi.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Icinga\Module\Director\Web\Controller\Extension;
+
+use Icinga\Module\Director\Objects\IcingaEndpoint;
+use Icinga\Module\Director\Core\CoreApi as Api;
+
+trait CoreApi
+{
+    /** @var Api */
+    private $api;
+
+    /**
+     * @return Api|null
+     */
+    public function getApiIfAvailable()
+    {
+        if ($this->api === null) {
+            if ($this->db()->hasDeploymentEndpoint()) {
+                $endpoint = $this->db()->getDeploymentEndpoint();
+                $this->api = $endpoint->api();
+            }
+        }
+
+        return $this->api;
+    }
+
+    /**
+     * @param string $endpointName
+     * @return Api
+     */
+    public function api($endpointName = null)
+    {
+        if ($this->api === null) {
+            if ($endpointName === null) {
+                $endpoint = $this->db()->getDeploymentEndpoint();
+            } else {
+                $endpoint = IcingaEndpoint::load($endpointName, $this->db());
+            }
+
+            $this->api = $endpoint->api();
+        }
+
+        return $this->api;
+    }
+}