Add Assets extender for frontend extensions

framework/core/src/Extend/Assets.php

@@ -0,0 +1,81 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Extend;
+
+use Flarum\Frontend\Event\Rendering;
+use Illuminate\Contracts\Container\Container;
+use Illuminate\Events\Dispatcher;
+
+class Assets implements Extender
+{
+    protected $appName;
+
+    protected $assets = [];
+    protected $bootstrapper;
+
+    public function __construct($appName)
+    {
+        $this->appName = $appName;
+    }
+
+    public function defaultAssets($baseDir)
+    {
+        $this->asset("$baseDir/js/{$this->appName}/dist/extension.js");
+        $this->asset("$baseDir/less/{$this->appName}/extension.less");
+
+        return $this;
+    }
+
+    public function asset($path)
+    {
+        $this->assets[] = $path;
+
+        return $this;
+    }
+
+    public function bootstrapper($name)
+    {
+        $this->bootstrapper = $name;
+
+        return $this;
+    }
+
+    public function apply(Container $container)
+    {
+        $container->make(Dispatcher::class)->listen(
+            Rendering::class,
+            function (Rendering $event) {
+                if (! $this->matches($event)) {
+                    return;
+                }
+
+                $event->addAssets($this->assets);
+
+                if ($this->bootstrapper) {
+                    $event->addBootstrapper($this->bootstrapper);
+                }
+            }
+        );
+    }
+
+    private function matches(Rendering $event)
+    {
+        switch ($this->appName) {
+            case 'admin':
+                return $event->isAdmin();
+            case 'forum':
+                return $event->isForum();
+            default:
+                return false;
+        }
+    }
+}