Added the ability to manage a group of users.

app/Rules/Permission.php

@@ -0,0 +1,55 @@
+<?php declare(strict_types=1);
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+final readonly class Permission implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (!is_string($value) && !is_array($value)) {
+            $fail('validation.no_type')->translate(['type' => 'string, array']);
+            return;
+        }
+
+        if (is_string($value)) {
+            $this->validatePermission($value, $fail);
+        }
+
+        if (is_array($value)) {
+            foreach ($value as $item) {
+                $this->validatePermission($item, $fail);
+            }
+        }
+    }
+
+    private function validatePermission(string $value, Closure $fail): void
+    {
+        $value = explode('.', $value, 2);
+
+        if (count($value) !== 2) {
+            $fail('validation.enum')->translate();
+            return;
+        }
+
+        list($permissionEnum, $permission) = $value;
+        $permissionEnum = \App\Enums\Permission::tryFrom($permissionEnum);
+        if (is_null($permissionEnum)) {
+            $fail('validation.enum')->translate();
+            return;
+        }
+
+        $permissions = $permissionEnum->getPermissions();
+        if (!isset($permissions[$permission])) {
+            $fail('validation.enum')->translate();
+            return;
+        }
+    }
+}