User.php

<?php
 
namespace Bitrix\Im\V2\Controller;
 
use Bitrix\Im\V2\Entity;
use Bitrix\Main\Engine\AutoWire\ExactParameter;
 
class User extends BaseController
{
    public function getPrimaryAutoWiredParameter()
    {
        return new ExactParameter(
            Entity\User\User::class,
            'user',
            function ($className, int $id) {
                return $this->getUserById($id);
            }
        );
    }
 
    public function getDepartmentAction(Entity\User\User $user): ?array
    {
        $department = $user->getDepartments()->filterExist()->getDeepest()->getAny();
 
        if ($department === null)
        {
            return null;
        }
 
        return $this->toRestFormat($department);
    }
 
    protected function getUserById(int $id): ?Entity\User\User
    {
        $user = Entity\User\User::getInstance($id);
 
        if (!$user->isExist())
        {
            $this->addError(new Entity\User\UserError(Entity\User\UserError::NOT_FOUND));
 
            return null;
        }
 
        return $user;
    }
}