Preview functionality for unpublished articles

app/Http/Controllers/NewsController.php

@@ -17,7 +17,11 @@ class NewsController extends Controller
     public function show(Request $request, $id)
     {
 	parent::registerView($request, 'nieuws', $id);
-        $apiResult = $this->API('nieuws/bericht/' . $id);
+	$preview = "";
+	if(request()->get('preview', null) != null) {
+	    $preview = "?preview=" . request()->get('preview');
+	}
+        $apiResult = $this->API('nieuws/bericht/' . $id . $preview);
         $newsItem = new \Model\NewsItem($apiResult->news);
 
         switch ($apiResult->version) {