[1.x] Allow Fortify views to accept Responsable objects

src/Http/Responses/SimpleViewResponse.php

@@ -2,6 +2,7 @@
 
 namespace Laravel\Fortify\Http\Responses;
 
+use Illuminate\Contracts\Support\Responsable;
 use Laravel\Fortify\Contracts\ConfirmPasswordViewResponse;
 use Laravel\Fortify\Contracts\LoginViewResponse;
 use Laravel\Fortify\Contracts\RegisterViewResponse;
@@ -45,8 +46,16 @@ public function __construct($view)
      */
     public function toResponse($request)
     {
-        return is_callable($this->view) && ! is_string($this->view)
-                    ? call_user_func($this->view, $request)
-                    : view($this->view, ['request' => $request]);
+        if (! is_callable($this->view) || is_string($this->view)) {
+            return view($this->view, ['request' => $request]);
+        }
+
+        $response = call_user_func($this->view, $request);
+
+        if ($response instanceof Responsable) {
+            return $response->toResponse($request);
+        }
+
+        return $response;
     }
 }

tests/FortifyServiceProviderTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Laravel\Fortify\Tests;
+
+use Illuminate\Contracts\Support\Responsable;
+use Illuminate\Http\JsonResponse;
+use Laravel\Fortify\Fortify;
+
+class FortifyServiceProviderTest extends OrchestraTestCase
+{
+    public function test_views_can_be_customized()
+    {
+        Fortify::loginView(function () {
+            return 'foo';
+        });
+
+        $response = $this->get('/login');
+
+        $response->assertOk();
+        $this->assertSame('foo', $response->content());
+    }
+
+    public function test_customized_views_can_return_their_own_responsable()
+    {
+        Fortify::loginView(function () {
+            return new class implements Responsable {
+                public function toResponse($request)
+                {
+                    return new JsonResponse(['foo' => 'bar']);
+                }
+            };
+        });
+
+        $response = $this->get('/login');
+
+        $response->assertOk();
+        $response->assertExactJson(['foo' => 'bar']);
+    }
+}