ENGCOM-3007: Mutations coupons #163

 - Merge Pull Request #163 from magento/graphql-ce:mutations-coupons
 - Merged commits:
   1. ced2301
   2. 6abc7e5
   3. b6eaa1f
   4. 1a077ac
   5. 9cb459e
   6. ba6dd12
   7. 02c2bc0
   8. 7f1148f
   9. b6365e1
   10. 3007b3a
   11. 2a0a450
   12. 462601c
   13. 2f4767d
   14. 343e463
   15. 46b40b4
   16. fc12cb7

app/code/Magento/QuoteGraphQl/Model/Authorization/IsCartMutationAllowedForCurrentUser.php

@@ -0,0 +1,67 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Authorization;
+
+use Magento\Authorization\Model\UserContextInterface;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
+use Magento\Quote\Api\CartRepositoryInterface;
+
+/**
+ * Service for checking that the shopping cart operations are allowed for current user
+ */
+class IsCartMutationAllowedForCurrentUser
+{
+    /**
+     * @var CartRepositoryInterface
+     */
+    private $cartRepository;
+
+    /**
+     * @var UserContextInterface
+     */
+    private $userContext;
+
+    /**
+     * @param UserContextInterface $userContext
+     * @param CartRepositoryInterface $cartRepository
+     */
+    public function __construct(
+        UserContextInterface $userContext,
+        CartRepositoryInterface $cartRepository
+    ) {
+        $this->userContext = $userContext;
+        $this->cartRepository = $cartRepository;
+    }
+
+    /**
+     * Check that the shopping cart operations are allowed for current user
+     *
+     * @param int $quoteId
+     * @return bool
+     * @throws GraphQlNoSuchEntityException
+     */
+    public function execute(int $quoteId): bool
+    {
+        try {
+            $quote = $this->cartRepository->get($quoteId);
+        } catch (NoSuchEntityException $exception) {
+            throw new GraphQlNoSuchEntityException(__($exception->getMessage()));
+        }
+
+        $customerId = $quote->getCustomerId();
+
+        /* Guest cart, allow operations */
+        if (!$customerId) {
+            return true;
+        }
+
+        /* If the quote belongs to the current customer allow operations */
+        return $customerId == $this->userContext->getUserId();
+    }
+}

app/code/Magento/QuoteGraphQl/Model/Resolver/Coupon/ApplyCouponToCart.php

@@ -0,0 +1,110 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver\Coupon;
+
+use Magento\Framework\Exception\CouldNotSaveException;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlAuthorizationException;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Quote\Api\CouponManagementInterface;
+use Magento\Quote\Model\MaskedQuoteIdToQuoteIdInterface;
+use Magento\QuoteGraphQl\Model\Authorization\IsCartMutationAllowedForCurrentUser;
+
+/**
+ * @inheritdoc
+ */
+class ApplyCouponToCart implements ResolverInterface
+{
+    /**
+     * @var CouponManagementInterface
+     */
+    private $couponManagement;
+
+    /**
+     * @var MaskedQuoteIdToQuoteIdInterface
+     */
+    private $maskedQuoteIdToQuoteId;
+
+    /**
+     * @var IsCartMutationAllowedForCurrentUser
+     */
+    private $isCartMutationAllowedForCurrentUser;
+
+    /**
+     * @param CouponManagementInterface $couponManagement
+     * @param MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToId
+     * @param IsCartMutationAllowedForCurrentUser $isCartMutationAllowedForCurrentUser
+     */
+    public function __construct(
+        CouponManagementInterface $couponManagement,
+        MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToId,
+        IsCartMutationAllowedForCurrentUser $isCartMutationAllowedForCurrentUser
+    ) {
+        $this->couponManagement = $couponManagement;
+        $this->maskedQuoteIdToQuoteId = $maskedQuoteIdToId;
+        $this->isCartMutationAllowedForCurrentUser = $isCartMutationAllowedForCurrentUser;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
+    {
+        if (!isset($args['input']['cart_id'])) {
+            throw new GraphQlInputException(__('Required parameter "cart_id" is missing'));
+        }
+        $maskedCartId = $args['input']['cart_id'];
+
+        if (!isset($args['input']['coupon_code'])) {
+            throw new GraphQlInputException(__('Required parameter "coupon_code" is missing'));
+        }
+        $couponCode = $args['input']['coupon_code'];
+
+        try {
+            $cartId = $this->maskedQuoteIdToQuoteId->execute($maskedCartId);
+        } catch (NoSuchEntityException $exception) {
+            throw new GraphQlNoSuchEntityException(
+                __('Could not find a cart with ID "%masked_cart_id"', ['masked_cart_id' => $maskedCartId])
+            );
+        }
+
+        if (false === $this->isCartMutationAllowedForCurrentUser->execute($cartId)) {
+            throw new GraphQlAuthorizationException(
+                __(
+                    'The current user cannot perform operations on cart "%masked_cart_id"',
+                    ['masked_cart_id' => $maskedCartId]
+                )
+            );
+        }
+
+        /* Check current cart does not have coupon code applied */
+        $appliedCouponCode = $this->couponManagement->get($cartId);
+        if (!empty($appliedCouponCode)) {
+            throw new GraphQlInputException(
+                __('A coupon is already applied to the cart. Please remove it to apply another')
+            );
+        }
+
+        try {
+            $this->couponManagement->set($cartId, $couponCode);
+        } catch (NoSuchEntityException $exception) {
+            throw new GraphQlNoSuchEntityException(__($exception->getMessage()));
+        } catch (CouldNotSaveException $exception) {
+            throw new GraphQlInputException(__($exception->getMessage()));
+        }
+
+        $data['cart']['applied_coupon'] = [
+            'code' => $couponCode,
+        ];
+        return $data;
+    }
+}

app/code/Magento/QuoteGraphQl/Model/Resolver/Coupon/RemoveCouponFromCart.php

@@ -0,0 +1,97 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver\Coupon;
+
+use Magento\Framework\Exception\CouldNotDeleteException;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlAuthorizationException;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Quote\Api\CouponManagementInterface;
+use Magento\Quote\Model\MaskedQuoteIdToQuoteIdInterface;
+use Magento\QuoteGraphQl\Model\Authorization\IsCartMutationAllowedForCurrentUser;
+
+/**
+ * @inheritdoc
+ */
+class RemoveCouponFromCart implements ResolverInterface
+{
+    /**
+     * @var MaskedQuoteIdToQuoteIdInterface
+     */
+    private $maskedQuoteIdToId;
+
+    /**
+     * @var CouponManagementInterface
+     */
+    private $couponManagement;
+
+    /**
+     * @var IsCartMutationAllowedForCurrentUser
+     */
+    private $isCartMutationAllowedForCurrentUser;
+
+    /**
+     * @param CouponManagementInterface $couponManagement
+     * @param IsCartMutationAllowedForCurrentUser $isCartMutationAllowedForCurrentUser
+     * @param MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToId
+     */
+    public function __construct(
+        CouponManagementInterface $couponManagement,
+        IsCartMutationAllowedForCurrentUser $isCartMutationAllowedForCurrentUser,
+        MaskedQuoteIdToQuoteIdInterface $maskedQuoteIdToId
+    ) {
+        $this->couponManagement = $couponManagement;
+        $this->isCartMutationAllowedForCurrentUser = $isCartMutationAllowedForCurrentUser;
+        $this->maskedQuoteIdToId = $maskedQuoteIdToId;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
+    {
+        if (!isset($args['input']['cart_id'])) {
+            throw new GraphQlInputException(__('Required parameter "cart_id" is missing'));
+        }
+        $maskedCartId = $args['input']['cart_id'];
+
+        try {
+            $cartId = $this->maskedQuoteIdToId->execute($maskedCartId);
+        } catch (NoSuchEntityException $exception) {
+            throw new GraphQlNoSuchEntityException(
+                __('Could not find a cart with ID "%masked_cart_id"', ['masked_cart_id' => $maskedCartId])
+            );
+        }
+
+        if (false === $this->isCartMutationAllowedForCurrentUser->execute($cartId)) {
+            throw new GraphQlAuthorizationException(
+                __(
+                    'The current user cannot perform operations on cart "%masked_cart_id"',
+                    ['masked_cart_id' => $maskedCartId]
+                )
+            );
+        }
+
+        try {
+            $this->couponManagement->remove($cartId);
+        } catch (NoSuchEntityException $exception) {
+            throw new GraphQlNoSuchEntityException(__($exception->getMessage()));
+        } catch (CouldNotDeleteException $exception) {
+            throw new GraphQlInputException(__($exception->getMessage()));
+        }
+
+        $data['cart']['applied_coupon'] = [
+            'code' => '',
+        ];
+        return $data;
+    }
+}

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

@@ -3,4 +3,35 @@
 
 type Mutation {
     createEmptyCart: String @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\Cart\\CreateEmptyCart") @doc(description:"Creates empty shopping cart for guest or logged in user")
+    applyCouponToCart(input: ApplyCouponToCartInput): ApplyCouponToCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\Coupon\\ApplyCouponToCart")
+    removeCouponFromCart(input: RemoveCouponFromCartInput): RemoveCouponFromCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\Coupon\\RemoveCouponFromCart")
 }
+
+input ApplyCouponToCartInput {
+    cart_id: String!
+    coupon_code: String!
+}
+
+type ApplyCouponToCartOutput {
+    cart: Cart!
+}
+
+type Cart {
+    applied_coupon: AppliedCoupon
+}
+
+type CartAddress {
+    applied_coupon: AppliedCoupon
+}
+
+type AppliedCoupon {
+    code: String!
+}
+
+input RemoveCouponFromCartInput {
+    cart_id: String!
+}
+
+type RemoveCouponFromCartOutput {
+    cart: Cart
+}