factory.php

См. документацию.

<?php
namespace Bitrix\Calendar\Sharing\Link\Rule;
 
use Bitrix\Calendar\Sharing\Link;
 
class Factory
{
    public function getRuleBySharingLink(Link\Joint\JointLink $sharingLink): ?Rule
    {
        $linkObjectRule = $this->getLinkObjectRuleByLink($sharingLink);
 
        if (!is_null($linkObjectRule))
        {
            return (new Mapper())->getFromLinkObjectRule($linkObjectRule);
        }
 
        return null;
    }
 
    public function getLinkObjectRuleByLink(Link\Joint\JointLink $sharingLink): ?LinkObjectRule
    {
        $rule = match (true)
        {
            $sharingLink instanceof Link\CrmDealLink => new Link\Rule\UserCrmDealRule($sharingLink->getOwnerId()),
            $sharingLink instanceof Link\UserLink => new Link\Rule\UserRule($sharingLink->getUserId()),
            $sharingLink instanceof Link\GroupLink => new Link\Rule\GroupRule($sharingLink->getGroupId()),
            default => null,
        };
 
        return $rule?->setLinkId($sharingLink->getId());
    }
}