reorganize and cleanup php server code

server/app/Http/Requests/Role/UpdateRolePermissionsRequest.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Vanguard\Http\Requests\Role;
+
+use Illuminate\Validation\Rule;
+use Vanguard\Http\Requests\Request;
+use Vanguard\Permission;
+
+class UpdateRolePermissionsRequest extends Request
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        $permissions = Permission::pluck('id')->toArray();
+
+        return [
+            'permissions' => 'required|array',
+            'permissions.*' => Rule::in($permissions)
+        ];
+    }
+
+    public function messages()
+    {
+        return [
+            'permissions.*' => 'Provided permission does not exist.'
+        ];
+    }
+}