js: Don't serve scripts utilizing ECMA2016+ features

i.e. library javascript assets

library/Icinga/Application/webrouter.php

@@ -63,11 +63,13 @@ if (in_array($path, $special)) {
             exit;
 
         case 'js/icinga.dev.js':
-            JavaScript::send();
+            $forIe11 = (bool) preg_match('/Trident\/7.0;.*rv:11/', $_SERVER['HTTP_USER_AGENT']);
+            JavaScript::send(false, $forIe11);
             exit;
 
         case 'js/icinga.min.js':
-            JavaScript::sendMinified();
+            $forIe11 = (bool) preg_match('/Trident\/7.0;.*rv:11/', $_SERVER['HTTP_USER_AGENT']);
+            JavaScript::sendMinified($forIe11);
             break;
 
         default:

library/Icinga/Web/JavaScript.php

@@ -53,9 +53,9 @@ class JavaScript
         'js/define.js'
     ];
 
-    public static function sendMinified()
+    public static function sendMinified($forIe11 = false)
     {
-        self::send(true);
+        self::send(true, $forIe11);
     }
 
     /**
@@ -65,7 +65,7 @@ class JavaScript
      *
      * @param   bool    $minified   Whether to compress the client side script code
      */
-    public static function send($minified = false)
+    public static function send($minified = false, $forIe11 = false)
     {
         header('Content-Type: application/javascript');
         $basedir = Icinga::app()->getBootstrapDirectory();
@@ -91,10 +91,12 @@ class JavaScript
             $files[] = $filePath;
         }
 
+        if (! $forIe11) {
             // Prepare library file list
             foreach (Icinga::app()->getLibraries() as $library) {
                 $files = array_merge($files, $library->getJsAssets());
             }
+        }
 
         // Prepare core file list
         $coreFiles = [];
@@ -154,6 +156,7 @@ class JavaScript
             $js .= file_get_contents($file) . "\n\n\n";
         }
 
+        if (! $forIe11) {
             // Library files need to be namespaced first before they can be included
             foreach (Icinga::app()->getLibraries() as $library) {
                 foreach ($library->getJsAssets() as $file) {
@@ -177,6 +180,7 @@ class JavaScript
                     }
                 }
             }
+        }
 
         foreach ($coreFiles as $file) {
             $js .= file_get_contents($file) . "\n\n\n";

public/js/helpers.js

@@ -1,5 +1,11 @@
 /*! Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
 
+/* IE11 Polyfills */
+
+if (window.NodeList && !NodeList.prototype.forEach) {
+    NodeList.prototype.forEach = Array.prototype.forEach;
+}
+
 /* jQuery Plugins */
 (function ($) {
 

public/js/icinga/behavior/input-enrichment.js

@@ -7,9 +7,14 @@
 
     "use strict";
 
+    try {
         var FilterInput = require('icinga/ipl/widget/FilterInput');
         var TermInput = require('icinga/ipl/widget/TermInput');
         var Completer = require('icinga/ipl/widget/Completer');
+    } catch (e) {
+        console.warn('Unable to provide input enrichments. Libraries not available:', e);
+        return;
+    }
 
     Icinga.Behaviors = Icinga.Behaviors || {};