Add Merge Cart Mutation

app/code/Magento/QuoteGraphQl/Model/Cart/GetCart.php

@@ -0,0 +1,95 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Cart;
+
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\Quote\Model\MaskedQuoteIdToQuoteIdInterface;
+use Magento\Quote\Model\Quote;
+
+/**
+ * Get cart merge
+ */
+class GetCart
+{
+    /**
+     * @var MaskedQuoteIdToQuoteIdInterface
+     */
+    private $maskedQuoteIdToQuoteId;
+
+    /**
+     * @var CartRepositoryInterface
+     */
+    private $cartRepository;
+
+    /**
+     * @param MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToQuoteId
+     * @param CartRepositoryInterface $cartRepository
+     */
+    public function __construct(
+        MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToQuoteId,
+        CartRepositoryInterface $cartRepository
+    ) {
+        $this->maskedQuoteIdToQuoteId = $maskedQuoteIdToQuoteId;
+        $this->cartRepository = $cartRepository;
+    }
+
+    /**
+     * Get cart for merge
+     *
+     * @param string $cartHash
+     * @param int|null $customerId
+     * @param int $storeId
+     * @return Quote
+     * @throws GraphQlNoSuchEntityException
+     * @throws NoSuchEntityException
+     */
+    public function execute(string $cartHash, ?int $customerId, int $storeId): Quote
+    {
+        try {
+            $cartId = $this->maskedQuoteIdToQuoteId->execute($cartHash);
+        } catch (NoSuchEntityException $exception) {
+            throw new GraphQlNoSuchEntityException(
+                __('Could not find a cart with ID "%masked_cart_id"', ['masked_cart_id' => $cartHash])
+            );
+        }
+
+        try {
+            /** @var Quote $cart */
+            $cart = $this->cartRepository->get($cartId);
+        } catch (NoSuchEntityException $e) {
+            throw new GraphQlNoSuchEntityException(
+                __('Could not find a cart with ID "%masked_cart_id"', ['masked_cart_id' => $cartHash])
+            );
+        }
+
+        if ((int)$cart->getStoreId() !== $storeId) {
+            throw new GraphQlNoSuchEntityException(
+                __(
+                    'Wrong store code specified for cart "%masked_cart_id"',
+                    ['masked_cart_id' => $cartHash]
+                )
+            );
+        }
+
+        $cartCustomerId = (int)$cart->getCustomerId();
+
+        /* Guest cart, allow operations */
+        if (0 === $cartCustomerId) {
+            return $cart;
+        }
+
+        if ($cartCustomerId !== $customerId) {
+            throw new GraphQlNoSuchEntityException(
+                __('The current user cannot perform operations on cart "%masked_cart_id"', ['masked_cart_id' => $cartHash])
+            );
+        }
+        return $cart;
+    }
+}

app/code/Magento/QuoteGraphQl/Model/Cart/GetCartForUser.php

@@ -10,8 +10,6 @@
 use Magento\Framework\Exception\NoSuchEntityException;
 use Magento\Framework\GraphQl\Exception\GraphQlAuthorizationException;
 use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
-use Magento\Quote\Api\CartRepositoryInterface;
-use Magento\Quote\Model\MaskedQuoteIdToQuoteIdInterface;
 use Magento\Quote\Model\Quote;
 
 /**
@@ -20,25 +18,17 @@
 class GetCartForUser
 {
     /**
-     * @var MaskedQuoteIdToQuoteIdInterface
+     * @var GetCart
      */
-    private $maskedQuoteIdToQuoteId;
+    private $getCart;
 
     /**
-     * @var CartRepositoryInterface
-     */
-    private $cartRepository;
-
-    /**
-     * @param MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToQuoteId
-     * @param CartRepositoryInterface $cartRepository
+     * @param GetCart $getCart
      */
     public function __construct(
-        MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToQuoteId,
-        CartRepositoryInterface $cartRepository
+        GetCart $getCart
     ) {
-        $this->maskedQuoteIdToQuoteId = $maskedQuoteIdToQuoteId;
-        $this->cartRepository = $cartRepository;
+        $this->getCart = $getCart;
     }
 
     /**
@@ -54,38 +44,14 @@ public function __construct(
      */
     public function execute(string $cartHash, ?int $customerId, int $storeId): Quote
     {
-        try {
-            $cartId = $this->maskedQuoteIdToQuoteId->execute($cartHash);
-        } catch (NoSuchEntityException $exception) {
-            throw new GraphQlNoSuchEntityException(
-                __('Could not find a cart with ID "%masked_cart_id"', ['masked_cart_id' => $cartHash])
-            );
-        }
-
-        try {
-            /** @var Quote $cart */
-            $cart = $this->cartRepository->get($cartId);
-        } catch (NoSuchEntityException $e) {
-            throw new GraphQlNoSuchEntityException(
-                __('Could not find a cart with ID "%masked_cart_id"', ['masked_cart_id' => $cartHash])
-            );
-        }
+        $cart = $this->getCart->execute($cartHash, $customerId, $storeId);
 
         if (false === (bool)$cart->getIsActive()) {
             throw new GraphQlNoSuchEntityException(
                 __('Current user does not have an active cart.')
             );
         }
 
-        if ((int)$cart->getStoreId() !== $storeId) {
-            throw new GraphQlNoSuchEntityException(
-                __(
-                    'Wrong store code specified for cart "%masked_cart_id"',
-                    ['masked_cart_id' => $cartHash]
-                )
-            );
-        }
-
         $cartCustomerId = (int)$cart->getCustomerId();
 
         /* Guest cart, allow operations */

app/code/Magento/QuoteGraphQl/Model/Cart/MergeCarts.php

@@ -0,0 +1,91 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Cart;
+
+use Magento\Quote\Model\Quote;
+use Magento\Quote\Model\QuoteIdMask;
+use Magento\Quote\Model\QuoteIdMaskFactory;
+use Magento\Quote\Model\ResourceModel\Quote\QuoteIdMask as QuoteIdMaskResourceModel;
+use Magento\Quote\Api\CartRepositoryInterface;
+
+/**
+ * Merge two carts
+ */
+class MergeCarts
+{
+    /**
+     * @var QuoteIdMaskFactory
+     */
+    private $quoteMaskFactory;
+
+    /**
+     * @var QuoteIdMaskResourceModel
+     */
+    private $quoteMaskResource;
+
+    /**
+     * @var CartRepositoryInterface
+     */
+    private $cartRepository;
+
+    /**
+     * @param QuoteIdMaskFactory $quoteMaskFactory
+     * @param QuoteIdMaskResourceModel $quoteMaskResource
+     * @param CartRepositoryInterface $cartRepository
+     */
+    public function __construct(
+        QuoteIdMaskFactory $quoteMaskFactory,
+        QuoteIdMaskResourceModel $quoteMaskResource,
+        CartRepositoryInterface $cartRepository
+    ) {
+        $this->quoteMaskFactory = $quoteMaskFactory;
+        $this->quoteMaskResource = $quoteMaskResource;
+        $this->cartRepository = $cartRepository;
+    }
+
+    /**
+     * Merge two quotes
+     *
+     * @param Quote $firstCart
+     * @param Quote $secondQuote
+     * @return string
+     */
+    public function execute(Quote $firstCart, Quote $secondQuote): string
+    {
+        $firstCart->merge($secondQuote);
+        $firstCart->setIsActive(true);
+
+        $this->updateMaskedId($secondQuote);
+        $maskedQuoteId = $this->updateMaskedId($firstCart);
+
+        $this->cartRepository->save($firstCart);
+
+        $secondQuote->setIsActive(false);
+        $this->cartRepository->save($secondQuote);
+
+        return $maskedQuoteId;
+    }
+
+    /**
+     * Update quote masked id
+     *
+     * @param Quote $quote
+     * @return string
+     */
+    private function updateMaskedId(Quote $quote): string
+    {
+        /** @var QuoteIdMask $quoteIdMask */
+        $quoteIdMask = $this->quoteMaskFactory->create();
+        $this->quoteMaskResource->load($quoteIdMask, $quote->getId(), 'quote_id');
+        $quoteIdMask->unsetData('masked_id');
+        $this->quoteMaskResource->save($quoteIdMask);
+        $maskedId = $quoteIdMask->getMaskedId();
+
+        return $maskedId;
+    }
+}

app/code/Magento/QuoteGraphQl/Model/Resolver/MergeCarts.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver;
+
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\QuoteGraphQl\Model\Cart\GetCart;
+use Magento\QuoteGraphQl\Model\Cart\MergeCarts as MergeCartsModel;
+
+/**
+ * @inheritdoc
+ */
+class MergeCarts implements ResolverInterface
+{
+    /**
+     * @var GetCart
+     */
+    private $getCart;
+
+    /**
+     * @var MergeCartsModel
+     */
+    private $mergeCarts;
+
+    /**
+     * @param GetCart $getCart
+     * @param MergeCartsModel $mergeCarts
+     */
+    public function __construct(
+        GetCart $getCart,
+        MergeCartsModel $mergeCarts
+    ) {
+        $this->getCart = $getCart;
+        $this->mergeCarts = $mergeCarts;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
+    {
+        if (empty($args['input']['first_cart_id'])) {
+            throw new GraphQlInputException(__('Required parameter "first_cart_id" is missing'));
+        }
+        if (empty($args['input']['second_cart_id'])) {
+            throw new GraphQlInputException(__('Required parameter "second_cart_id" is missing'));
+        }
+
+        $currentUserId = $context->getUserId();
+        $storeId = $storeId = (int) $context->getExtensionAttributes()->getStore()->getId();
+        $firstCart = $this->getCart->execute($args['input']['first_cart_id'], $currentUserId, $storeId);
+        $secondCart = $this->getCart->execute($args['input']['second_cart_id'], $currentUserId, $storeId);
+
+        $maskedQuoteId = $this->mergeCarts->execute($firstCart, $secondCart);
+
+        return $maskedQuoteId;
+    }
+}

app/code/Magento/QuoteGraphQl/etc/schema.graphqls

@@ -20,6 +20,7 @@ type Mutation {
     setGuestEmailOnCart(input: SetGuestEmailOnCartInput): SetGuestEmailOnCartOutput @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\SetGuestEmailOnCart")
     setPaymentMethodAndPlaceOrder(input: SetPaymentMethodAndPlaceOrderInput): PlaceOrderOutput @deprecated(reason: "Should use setPaymentMethodOnCart and placeOrder mutations in single request.") @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\SetPaymentAndPlaceOrder")
     placeOrder(input: PlaceOrderInput): PlaceOrderOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\PlaceOrder")
+    mergeCarts(input: MergeCartsInput): String @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\MergeCarts")
 }
 
 input createEmptyCartInput {
@@ -146,6 +147,11 @@ input SetGuestEmailOnCartInput {
     email: String!
 }
 
+input MergeCartsInput {
+    first_cart_id: String!
+    second_cart_id: String!
+}
+
 type CartPrices {
     grand_total: Money
     subtotal_including_tax: Money