Member.php

См. документацию.

<?php
 
declare(strict_types=1);
 
namespace Bitrix\Im\V2\Controller\Chat;
 
use Bitrix\Im\V2\Chat;
use Bitrix\Im\V2\Controller\BaseController;
use Bitrix\Im\V2\Relation\Provider\RelationCursor;
use Bitrix\Main\Validation\Engine\AutoWire\ValidationParameter;
 
class Member extends BaseController
{
    public function getAutoWiredParameters()
    {
        return array_merge(
            [
                new ValidationParameter(
                    RelationCursor::class,
                    fn ($className, array $cursor) => RelationCursor::createFromArray($cursor),
                    fn () => 'cursor'
                ),
            ],
            parent::getAutoWiredParameters()
        );
    }

    public function tailAction(Chat $chat, int $limit = 50, ?RelationCursor $relationCursor = null): ?array
    {
        $members = $chat->getRelationProvider()->getMembers($limit, $relationCursor);
        $nextCursor = RelationCursor::getNext($members, $limit);
        $rest = $this->toRestFormat($members);
        $rest['nextCursor'] = $nextCursor?->toRestFormat();
 
        return $rest;
    }
}