Support Auto Registration of Middleware on Laravel 5.4+

Author: claudiodekker

src/ServiceProvider.php

@@ -53,12 +53,18 @@ protected function registerRouterMacro()
     protected function registerMiddleware()
     {
         $kernel = $this->app[Kernel::class];
+        $group = Config::get('inertia.middleware_group', 'web');
 
+        // Laravel >= 6.9.0
         if (method_exists($kernel, 'appendMiddlewareToGroup')) {
-            $kernel->appendMiddlewareToGroup(
-                Config::get('inertia.middleware_group', 'web'),
-                Middleware::class
-            );
+            $kernel->appendMiddlewareToGroup($group, Middleware::class);
+
+            return;
+        }
+
+        // Laravel >= 5.4.4 && < 6.9.0
+        if ($this->app[Router::class]->hasMiddlewareGroup($group)) {
+            $this->app[Router::class]->pushMiddlewareToGroup($group, Middleware::class);
         }
     }
 

tests/ServiceProviderTest.php

@@ -6,6 +6,7 @@
 use Inertia\Inertia;
 use Inertia\Middleware;
 use Illuminate\Http\Request;
+use Illuminate\Routing\Router;
 use Illuminate\Support\MessageBag;
 use Illuminate\Support\Facades\App;
 use Illuminate\Support\ViewErrorBag;
@@ -48,11 +49,12 @@ public function test_route_macro_is_registered()
         $this->assertEquals(['component' => 'User/Edit', 'props' => ['user' => ['name' => 'Jonathan']]], $route->defaults);
     }
 
-    public function test_middleware_is_registered()
+    public function test_middleware_is_registered_to_the_web_group()
     {
-        $middleware = App::make(Kernel::class)->getMiddlewareGroups();
+        $route = Route::middleware('web')->get('/');
+        $middleware = App::make(Router::class)->gatherRouteMiddleware($route);
 
-        $this->assertContains(Middleware::class, $middleware['web']);
+        $this->assertContains(Middleware::class, $middleware);
     }
 
     public function test_validation_errors_are_registered()