Revert "AC-15054: Product Add to Cart issue in Rest API"

This reverts commit 0d44645.

Author: sumesh-GL

app/code/Magento/Quote/Plugin/Webapi/ValidateProductWebsiteAssignmentForGuest.php

@@ -0,0 +1,95 @@
+<?php
+/**
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
+ */
+declare(strict_types=1);
+
+namespace Magento\Quote\Plugin\Webapi;
+
+use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Quote\Api\Data\CartItemInterface;
+use Magento\Quote\Api\GuestCartItemRepositoryInterface;
+use Magento\Quote\Model\QuoteIdMaskFactory;
+use Magento\Store\Model\StoreManagerInterface;
+
+/**
+ * Plugin to validate product website assignment for guest cart operations
+ */
+class ValidateProductWebsiteAssignmentForGuest
+{
+    /**
+     * @param ProductRepositoryInterface $productRepository
+     * @param StoreManagerInterface $storeManager
+     * @param QuoteIdMaskFactory $quoteIdMaskFactory
+     */
+    public function __construct(
+        private readonly ProductRepositoryInterface $productRepository,
+        private readonly StoreManagerInterface      $storeManager,
+        private readonly QuoteIdMaskFactory         $quoteIdMaskFactory
+    ) {
+    }
+
+    /**
+     * Validate product website assignment before saving guest cart item
+     *
+     * @param GuestCartItemRepositoryInterface $subject
+     * @param CartItemInterface $cartItem
+     * @return array
+     * @throws LocalizedException
+     * @throws NoSuchEntityException
+     *
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function beforeSave(
+        GuestCartItemRepositoryInterface $subject,
+        CartItemInterface                $cartItem
+    ): array {
+        $this->validateProductWebsiteAssignment($cartItem);
+        return [$cartItem];
+    }
+
+    /**
+     * Validate that product is assigned to the current website
+     *
+     * @param CartItemInterface $cartItem
+     * @throws LocalizedException
+     * @throws NoSuchEntityException
+     */
+    private function validateProductWebsiteAssignment(CartItemInterface $cartItem): void
+    {
+        $sku = $cartItem->getSku();
+        if (!$sku) {
+            return;
+        }
+
+        // Get current website ID from the masked cart ID
+        $maskedQuoteId = $cartItem->getQuoteId();
+        $quoteIdMask = $this->quoteIdMaskFactory->create()->load($maskedQuoteId, 'masked_id');
+
+        if (!$quoteIdMask->getQuoteId()) {
+            return; // Let other validations handle invalid cart
+        }
+
+        $currentWebsiteId = $this->storeManager->getStore()->getWebsiteId();
+
+        try {
+            $product = $this->productRepository->get($sku, false, null);
+
+            $productWebsiteIds = $product->getWebsiteIds();
+
+            // Validate website assignment
+            if (!is_array($productWebsiteIds) || !in_array($currentWebsiteId, $productWebsiteIds)) {
+                throw new LocalizedException(
+                    __('Product that you are trying to add is not available.')
+                );
+            }
+        } catch (NoSuchEntityException $e) {
+            throw new LocalizedException(
+                __('Product that you are trying to add is not available.')
+            );
+        }
+    }
+}