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<?php declare(strict_types=1);
namespace Shopware\Core\Checkout\Promotion\Subscriber\Storefront;
use Shopware\Core\Checkout\Cart\Cart;
use Shopware\Core\Checkout\Cart\Event\CheckoutOrderPlacedEvent;
use Shopware\Core\Checkout\Cart\Event\LineItemAddedEvent;
use Shopware\Core\Checkout\Cart\Event\LineItemQuantityChangedEvent;
use Shopware\Core\Checkout\Cart\Event\LineItemRemovedEvent;
use Shopware\Core\Checkout\Cart\Exception\InvalidPayloadException;
use Shopware\Core\Checkout\Cart\Exception\InvalidQuantityException;
use Shopware\Core\Checkout\Cart\Exception\LineItemNotFoundException;
use Shopware\Core\Checkout\Cart\Exception\LineItemNotRemovableException;
use Shopware\Core\Checkout\Cart\Exception\LineItemNotStackableException;
use Shopware\Core\Checkout\Cart\Exception\MixedLineItemTypeException;
use Shopware\Core\Checkout\Cart\Exception\PayloadKeyNotFoundException;
use Shopware\Core\Checkout\Cart\LineItem\LineItem;
use Shopware\Core\Checkout\Promotion\Aggregate\PromotionDiscount\PromotionDiscountEntity;
use Shopware\Core\Checkout\Promotion\Cart\PromotionItemBuilder;
use Shopware\Core\Checkout\Promotion\Cart\PromotionProcessor;
use Shopware\Core\System\SalesChannel\SalesChannelContext;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Session\Session;
class StorefrontCartSubscriber implements EventSubscriberInterface
{
public const SESSION_KEY_PROMOTION_CODES = 'cart-promotion-codes';
/**
* @var Session
*/
private $session;
public function __construct(Session $session)
{
$this->session = $session;
}
public static function getSubscribedEvents(): array
{
return [
LineItemAddedEvent::class => 'onLineItemAdded',
LineItemQuantityChangedEvent::class => 'onLineItemQuantityChanged',
LineItemRemovedEvent::class => 'onLineItemRemoved',
CheckoutOrderPlacedEvent::class => 'resetCodes',
];
}
public function resetCodes(): void
{
$this->session->set(self::SESSION_KEY_PROMOTION_CODES, []);
}
/**
* This function is called whenever a new line item has been
* added to the cart from within the controllers.
* We verify if we have a placeholder line item for a promotion
* and add that code to our global session list.
* We also re-add all codes that the user
* has previously added in case they might work now.
*/
public function onLineItemAdded(LineItemAddedEvent $event): void
{
$this->setupSession();
if ($event->getLineItem()->getType() === PromotionProcessor::LINE_ITEM_TYPE) {
$code = $event->getLineItem()->getReferencedId();
if ($code !== null && $code !== '') {
$this->addToSession($code);
}
}
$this->reAddPromotionsFromSession($event->getCart(), $event->getContext());
}
/**
* This function is called whenever a line item quantity changes.
* In this case we just make sure that we re-add all codes that the user
* has previously added in case they might work now.
*/
public function onLineItemQuantityChanged(LineItemQuantityChangedEvent $event): void
{
$this->setupSession();
$this->reAddPromotionsFromSession($event->getCart(), $event->getContext());
}
/**
* This function is called whenever a line item is being removed
* from the cart from within a controller.
* We verify if it is a promotion item, and also remove that
* code from our global session, if existing.
* We also re-add all codes that the user
* has previously added in case they might work now.
*/
public function onLineItemRemoved(LineItemRemovedEvent $event): void
{
$this->setupSession();
$cart = $event->getCart();
if ($event->getLineItem()->getType() === PromotionProcessor::LINE_ITEM_TYPE) {
$lineItem = $event->getLineItem();
$code = $lineItem->getReferencedId();
if ($code !== null && $code !== '') {
$this->checkFixedDiscountItems($cart, $lineItem);
$this->removeFromSession($code);
}
}
$this->reAddPromotionsFromSession($cart, $event->getContext());
}
/**
* This function adds placeholder line items for promotions.
* It will always add items for all codes that are existing in
* the current session of the user.
* Thus it will re-add promotions that have been added before
* and where not explicitly removed by the user.
*
* @throws InvalidPayloadException
* @throws InvalidQuantityException
* @throws LineItemNotStackableException
* @throws MixedLineItemTypeException
*/
private function reAddPromotionsFromSession(Cart $cart, SalesChannelContext $context): void
{
/** @var string[] $allSessionCodes */
$allSessionCodes = $this->session->get(self::SESSION_KEY_PROMOTION_CODES);
if (\count($allSessionCodes) <= 0) {
return;
}
$codesInCart = $cart->getLineItems()->filterType(PromotionProcessor::LINE_ITEM_TYPE)->getReferenceIds();
$builder = new PromotionItemBuilder();
foreach ($allSessionCodes as $sessionCode) {
// only add a new placeholder item if that
// code is not already existing either as placeholder or real promotion item
if (!\in_array($sessionCode, $codesInCart, true)) {
$lineItem = $builder->buildPlaceholderItem($sessionCode, $context->getContext()->getCurrencyPrecision());
$cart->add($lineItem);
}
}
}
/**
* @throws LineItemNotFoundException
* @throws LineItemNotRemovableException
* @throws PayloadKeyNotFoundException
*/
private function checkFixedDiscountItems(Cart $cart, LineItem $lineItem): void
{
$lineItems = $cart->getLineItems()->filterType(PromotionProcessor::LINE_ITEM_TYPE);
if ($lineItems->count() < 1) {
return;
}
if (!$lineItem->hasPayloadValue('discountType')) {
return;
}
if ($lineItem->getPayloadValue('discountType') !== PromotionDiscountEntity::TYPE_FIXED_UNIT) {
return;
}
if (!$lineItem->hasPayloadValue('discountId')) {
return;
}
$discountId = $lineItem->getPayloadValue('discountId');
$removeThisDiscounts = $lineItems->filter(static function (LineItem $lineItem) use ($discountId) {
return $lineItem->hasPayloadValue('discountId') && $lineItem->getPayloadValue('discountId') === $discountId;
});
foreach ($removeThisDiscounts as $discountItem) {
$cart->remove($discountItem->getId());
}
}
/**
* if a customer adds a promotion code it is stored in the session
* the promotion will be added each time if a change in cart occurs
* This ensures that is added and removed automatically if restrictions
* of promotions fit or do not fit
*/
private function addToSession(string $code): void
{
/** @var array $allCodes */
$allCodes = $this->session->get(self::SESSION_KEY_PROMOTION_CODES);
// add our new item
if (!\in_array($code, $allCodes, true)) {
$allCodes[] = $code;
}
$this->session->set(self::SESSION_KEY_PROMOTION_CODES, $allCodes);
}
/**
* if a customer removes a promotion code from the cart, he explicitly tells us
* that he doesn't want it => remove it from session store to ensure it is not
* added automatically any more
*/
private function removeFromSession(string $code): void
{
/** @var array $allCodes */
$allCodes = $this->session->get(self::SESSION_KEY_PROMOTION_CODES);
// remove our code string from the list
$allCodes = array_diff($allCodes, [$code]);
$this->session->set(self::SESSION_KEY_PROMOTION_CODES, $allCodes);
}
/**
* Creates an empty session list if not already existing.
*/
private function setupSession(): void
{
if (!$this->session->has(self::SESSION_KEY_PROMOTION_CODES)) {
$this->session->set(self::SESSION_KEY_PROMOTION_CODES, []);
}
}
}

vendor/shopware/core/Checkout/Promotion/Subscriber/Storefront/StorefrontCartSubscriber.php line 82