[5.7] Authorize Middleware Doesn't Accept String Parameters (#25763)

* Add test case for string parameter for Authorize middleware

* Pass model value as default value in Authorize middleware

* Add test using string route parameter

src/Illuminate/Auth/Middleware/Authorize.php

@@ -72,7 +72,7 @@ protected function getGateArguments($request, $models)
      */
     protected function getModel($request, $model)
     {
-        return $this->isClassName($model) ? $model : $request->route($model);
+        return $this->isClassName($model) ? $model : $request->route($model, $model);
     }
 
     /**

tests/Auth/AuthorizeMiddlewareTest.php

@@ -86,6 +86,42 @@ public function testSimpleAbilityAuthorized()
         $this->assertEquals($response->content(), 'success');
     }
 
+    public function testSimpleAbilityWithStringParameter()
+    {
+        $this->gate()->define('view-dashboard', function ($user, $param) {
+            return $param === 'true';
+        });
+
+        $this->router->get('dashboard', [
+            'middleware' => Authorize::class.':view-dashboard,true',
+            'uses' => function () {
+                return 'success';
+            },
+        ]);
+
+        $response = $this->router->dispatch(Request::create('dashboard', 'GET'));
+
+        $this->assertEquals($response->content(), 'success');
+    }
+
+    public function testSimpleAbilityWithStringParameterFromRouteParameter()
+    {
+        $this->gate()->define('view-dashboard', function ($user, $param) {
+            return $param === 'true';
+        });
+
+        $this->router->get('dashboard/{route_parameter}', [
+            'middleware' => Authorize::class.':view-dashboard,route_parameter',
+            'uses' => function () {
+                return 'success';
+            },
+        ]);
+
+        $response = $this->router->dispatch(Request::create('dashboard/true', 'GET'));
+
+        $this->assertEquals($response->content(), 'success');
+    }
+
     /**
      * @expectedException \Illuminate\Auth\Access\AuthorizationException
      * @expectedExceptionMessage This action is unauthorized.