make permission for plan edit only author can edit his plan

app/Http/Controllers/PlanController.php

@@ -7,6 +7,7 @@ use App\Models\User;
 use Illuminate\Contracts\View\Factory as ViewFactory;
 use Illuminate\Contracts\View\View;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Gate;
 
 class PlanController extends Controller
 {
@@ -41,6 +42,15 @@ class PlanController extends Controller
 
     public function edit(Plan $plan): View|ViewFactory
     {
+        if (! $this->canEditPlan($plan)) {
+            abort(403, 'Unauthorized action.');
+        }
+
         return view('plan/edit_form', ['plan' => $plan]);
     }
+
+    private function canEditPlan(Plan $plan): bool
+    {
+        return Gate::allows('edit', $plan);
+    }
 }