CREATE: New middleware to check if user have permission to access the createUser route.

app/Http/Middleware/Authorization.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Gate;
+use Symfony\Component\HttpFoundation\Response;
+
+class Authorization
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        if (Gate::denies('createUser')) {
+            return redirect()->route('users.create')->with('error', 'Você não possui permissão para executar essa ação.');
+        }
+        return $next($request);
+    }
+}