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)
+    {
+        //
+    }
 }

app/Http/Kernel.php

@@ -29,6 +29,7 @@ class Kernel extends HttpKernel
             \Illuminate\Session\Middleware\StartSession::class,
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
             \App\Http\Middleware\VerifyCsrfToken::class,
+            \App\Http\Middleware\ModuleRegistrator::class
         ],
 
         'api' => [

app/Http/Middleware/ModuleRegistrator.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class ModuleRegistrator
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request $request
+     * @param  \Closure                 $next
+     *
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        $modules = \Module::enabled();
+
+        // iterate over all enabled modules
+        foreach ($modules as $key => $module) {
+            $handler = config($module->getName() . '.handler');
+
+            // try to register menus
+            if (method_exists($handler, 'registerAdminMenu') && \Auth::check()) {
+                call_user_func([$handler, 'registerAdminMenu'], \Auth::user());
+            }
+        }
+
+        return $next($request);
+    }
+}