FEATURE #1401: add middleware for registering modules

app/Handlers/Handler.php

@@ -1,6 +1,39 @@
 <?php
 namespace App\Handlers;
 
-abstract class Handler {
-    abstract public function render();
+use App\Models\Content;
+use App\Models\User;
+use Illuminate\Support\Facades\Auth;
+
+/**
+ * Class Handler
+ *
+ * Handler is a class which handles module-specific behaviour which cannot be done by module itself, resp. cannot be done by some abstract magic.
+ *
+ * @package App\Handlers
+ */
+abstract class Handler
+{
+    /**
+     * Render given module into visitor area.
+     *
+     * @param Content $content    DB model from table contents
+     * @param array   $parameters parameters used for modifications/custom settings of given model
+     *
+     * @return mixed
+     */
+    abstract public function render(Content $content, $parameters);
+
+    /**
+     * Register admin menu (or multiple ones)
+     *
+     * This cannot be in ServiceProvider because Session is started at middleware. And ServiceProvider is called before
+     * starting any middleware..
+     *
+     * @param User $user model of logged user
+     */
+    public static function registerAdminMenu(User $user)
+    {
+        //
+    }
 }