Added check, test case and minor fixes

Author: Usik2203

app/code/Magento/GiftMessageGraphQl/Model/Resolver/Cart/GiftMessage.php

@@ -15,6 +15,7 @@
 use Magento\Framework\GraphQl\Query\ResolverInterface;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\GiftMessage\Api\CartRepositoryInterface;
+use Magento\GiftMessage\Helper\Message as GiftMessageHelper;
 
 /**
  * Class provides ability to get GiftMessage for cart
@@ -27,14 +28,20 @@ class GiftMessage implements ResolverInterface
     private $cartRepository;
 
     /**
-     * GiftMessage constructor.
-     *
+     * @var GiftMessageHelper
+     */
+    private $giftMessageHelper;
+
+    /**
      * @param CartRepositoryInterface $cartRepository
+     * @param GiftMessageHelper       $giftMessageHelper
      */
     public function __construct(
-        CartRepositoryInterface $cartRepository
+        CartRepositoryInterface $cartRepository,
+        GiftMessageHelper $giftMessageHelper
     ) {
         $this->cartRepository = $cartRepository;
+        $this->giftMessageHelper = $giftMessageHelper;
     }
 
     /**
@@ -61,8 +68,13 @@ public function resolve(
         if (!isset($value['model'])) {
             throw new GraphQlInputException(__('"model" value should be specified'));
         }
+
         $cart = $value['model'];
 
+        if (!$this->giftMessageHelper->isMessagesAllowed('order', $cart)) {
+            return null;
+        }
+
         try {
             $giftCartMessage = $this->cartRepository->get($cart->getId());
         } catch (LocalizedException $e) {

dev/tests/api-functional/testsuite/Magento/GraphQl/GiftMessage/Cart/GiftMessageTest.php

@@ -20,13 +20,14 @@ class GiftMessageTest extends GraphQlAbstract
      */
     private $getMaskedQuoteIdByReservedOrderId;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $objectManager = Bootstrap::getObjectManager();
         $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
     }
 
     /**
+     * @magentoConfigFixture default_store sales/gift_options/allow_order 1
      * @magentoApiDataFixture Magento/GiftMessage/_files/quote_with_message.php
      * @throws NoSuchEntityException
      * @throws Exception
@@ -41,6 +42,20 @@ public function testGiftMessageForCart()
         self::assertSame('I thought all for the best.', $response['cart']['gift_message']['message']);
     }
 
+    /**
+     * @magentoConfigFixture default_store sales/gift_options/allow_order 0
+     * @magentoApiDataFixture Magento/GiftMessage/_files/quote_with_message.php
+     * @throws NoSuchEntityException
+     * @throws Exception
+     */
+    public function testGiftMessageForCartWithNotAllow()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('message_order_21');
+        $response = $this->requestCartAndAssertResult($maskedQuoteId);
+        self::assertArrayHasKey('gift_message', $response['cart']);
+        self::assertNull($response['cart']['gift_message']);
+    }
+
     /**
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php