Base::processLinkAction

protected function processLinkAction()
{
	global $APPLICATION;

	if ($this->request->get($this->arParams['ACTION_VARIABLE'].self::ACTION_BUY) !== null)
	{
		$action = self::ACTION_BUY;
	}
	elseif ($this->request->get($this->arParams['ACTION_VARIABLE'].self::ACTION_ADD_TO_BASKET))
	{
		$action = self::ACTION_ADD_TO_BASKET;
	}
	else
	{
		$action = mb_strtoupper($this->request->get($this->arParams['ACTION_VARIABLE']));
	}

	$productId = (int)$this->request->get($this->arParams['PRODUCT_ID_VARIABLE']);

	if (
		($action == self::ACTION_ADD_TO_BASKET || $action == self::ACTION_BUY || $action == self::ACTION_SUBSCRIBE)
		&& Loader::includeModule('sale')
		&& Loader::includeModule('catalog')
	)
	{
		$addByAjax = $this->request->get('ajax_basket') === 'Y';
		if ($addByAjax)
		{
			$this->request->set(MainTextEncoding::convertEncoding($this->request->toArray(), 'UTF-8', SITE_CHARSET));
		}

		[$successfulAdd, $errorMsg] = $this->addProductToBasket($productId, $action);

		if ($addByAjax)
		{
			if ($successfulAdd)
			{
				$addResult = array(
					'STATUS' => 'OK',
					'MESSAGE' => Loc::getMessage('CATALOG_SUCCESSFUL_ADD_TO_BASKET')
				);
			}
			else
			{
				$addResult = array(
					'STATUS' => 'ERROR',
					'MESSAGE' => $errorMsg
				);
			}

			$APPLICATION->RestartBuffer();
			header('Content-Type: application/json');
			CMain::FinalActions(MainWebJson::encode($addResult));
		}
		else
		{
			if ($successfulAdd)
			{
				$pathRedirect = $action == self::ACTION_BUY
					? $this->arParams['BASKET_URL']
					: $APPLICATION->GetCurPageParam('', array(
						$this->arParams['PRODUCT_ID_VARIABLE'],
						$this->arParams['ACTION_VARIABLE'],
						$this->arParams['PRODUCT_QUANTITY_VARIABLE'],
						$this->arParams['PRODUCT_PROPS_VARIABLE']
					));

				LocalRedirect($pathRedirect);
			}
			else
			{
				$this->errorCollection->setError(new Error($errorMsg, self::ERROR_TEXT));
			}
		}
	}
}