CartItemProcessor.php

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<?php
namespace Magento\Bundle\Model;

use Magento\Quote\Model\Quote\Item\CartItemProcessorInterface;
use Magento\Quote\Api\Data\CartItemInterface;
use Magento\Bundle\Api\Data\BundleOptionInterfaceFactory;
use Magento\Quote\Api\Data as QuoteApi;

class CartItemProcessor implements CartItemProcessorInterface
{
    protected $objectFactory;

    protected $productOptionExtensionFactory;

    protected $bundleOptionFactory;

    protected $productOptionFactory;

    public function __construct(
        \Magento\Framework\DataObject\Factory $objectFactory,
        QuoteApi\ProductOptionExtensionFactory $productOptionExtensionFactory,
        BundleOptionInterfaceFactory $bundleOptionFactory,
        QuoteApi\ProductOptionInterfaceFactory $productOptionFactory
    ) {
        $this->objectFactory = $objectFactory;
        $this->productOptionExtensionFactory = $productOptionExtensionFactory;
        $this->bundleOptionFactory = $bundleOptionFactory;
        $this->productOptionFactory = $productOptionFactory;
    }

    public function convertToBuyRequest(CartItemInterface $cartItem)
    {
        if ($cartItem->getProductOption() && $cartItem->getProductOption()->getExtensionAttributes()) {
            $options = $cartItem->getProductOption()->getExtensionAttributes()->getBundleOptions();
            if (is_array($options)) {
                $requestData = [];
                foreach ($options as $option) {
                    foreach ($option->getOptionSelections() as $selection) {
                        $requestData['bundle_option'][$option->getOptionId()][] = $selection;
                        $requestData['bundle_option_qty'][$option->getOptionId()] = $option->getOptionQty();
                    }
                }
                return $this->objectFactory->create($requestData);
            }
        }
        return null;
    }

    public function processOptions(CartItemInterface $cartItem)
    {
        if ($cartItem->getProductType() !== \Magento\Catalog\Model\Product\Type::TYPE_BUNDLE) {
            return $cartItem;
        }
        $productOptions = [];
        $bundleOptions = $cartItem->getBuyRequest()->getBundleOption();
        $bundleOptionsQty = $cartItem->getBuyRequest()->getBundleOptionQty();
        if (is_array($bundleOptions)) {
            foreach ($bundleOptions as $optionId => $optionSelections) {
                if (empty($optionSelections)) {
                    continue;
                }
                $optionSelections = is_array($optionSelections) ? $optionSelections : [$optionSelections];
                $optionQty = isset($bundleOptionsQty[$optionId]) ? $bundleOptionsQty[$optionId] : 1;

                $productOption = $this->bundleOptionFactory->create();
                $productOption->setOptionId($optionId);
                $productOption->setOptionSelections($optionSelections);
                $productOption->setOptionQty($optionQty);
                $productOptions[] = $productOption;
            }

            $extension = $this->productOptionExtensionFactory->create()->setBundleOptions($productOptions);
            if (!$cartItem->getProductOption()) {
                $cartItem->setProductOption($this->productOptionFactory->create());
            }
            $cartItem->getProductOption()->setExtensionAttributes($extension);
        }
        return $cartItem;
    }
}