ChecklistSaveRule::execute

public function execute(AccessibleItem $task = null, $params = null): bool
{
	if (!$task)
	{
		$this->controller->addError(static::class, 'Incorrect task');
		return false;
	}

	if ($this->user->isAdmin())
	{
		return true;
	}

	if (!$this->controller->check(ActionDictionary::ACTION_TASK_READ, $task, $params))
	{
		return false;
	}

	// user can edit all checklist's items
	if ($this->controller->check(ActionDictionary::ACTION_CHECKLIST_EDIT, $task, $params))
	{
		return true;
	}

	if ($task instanceof TemplateModel)
	{
		$this->controller->addError(static::class, 'Unable to works with template');
		return false;
	}

	if (!$this->isList($params))
	{
		$checklist = $this->getModelFromParams($params);
		$action = $checklist->getId()
			? ActionDictionary::ACTION_CHECKLIST_EDIT
			: ActionDictionary::ACTION_CHECKLIST_ADD;

		return $this->controller->check($action, $task, $checklist);
	}

	// Warning! Mass check for webform format only. See TasksTaskComponent::checkRights()
	$delta = $this->getDelta($task->getChecklist(), $params);
	// nothing changed
	if (empty($delta))
	{
		return true;
	}

	if (!array_key_exists(self::CHANGED, $delta))
	{
		return $this->controller->check(ActionDictionary::ACTION_CHECKLIST_ADD, $task, $params);
	}

	foreach ($delta[self::CHANGED] as $row)
	{
		if (!$this->controller->check(ActionDictionary::ACTION_CHECKLIST_EDIT, $task, $row))
		{
			$this->controller->addError(static::class, 'Access to checklist edit denied');
			return false;
		}
	}

	foreach ($delta[self::STATUS_CHANGED] ?? [] as $row)
	{
		if (!$this->controller->check(ActionDictionary::ACTION_CHECKLIST_TOGGLE, $task, $row))
		{
			$this->controller->addError(static::class, 'Access to checklist toggle denied');
			return false;
		}
	}

	return true;
}