Copier.php

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<?php
namespace Magento\Catalog\Model\Product;

use Magento\Catalog\Api\Data\ProductInterface;

class Copier
{
    protected $optionRepository;

    protected $copyConstructor;

    protected $productFactory;

    protected $metadataPool;

    public function __construct(
        CopyConstructorInterface $copyConstructor,
        \Magento\Catalog\Model\ProductFactory $productFactory
    ) {
        $this->productFactory = $productFactory;
        $this->copyConstructor = $copyConstructor;
    }

    public function copy(\Magento\Catalog\Model\Product $product)
    {
        $product->getWebsiteIds();
        $product->getCategoryIds();

        $metadata = $this->getMetadataPool()->getMetadata(ProductInterface::class);

        $duplicate = $this->productFactory->create();
        $productData = $product->getData();
        $productData = $this->removeStockItem($productData);
        $duplicate->setData($productData);
        $duplicate->setOptions([]);
        $duplicate->setIsDuplicate(true);
        $duplicate->setOriginalLinkId($product->getData($metadata->getLinkField()));
        $duplicate->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_DISABLED);
        $duplicate->setCreatedAt(null);
        $duplicate->setUpdatedAt(null);
        $duplicate->setId(null);
        $duplicate->setStoreId(\Magento\Store\Model\Store::DEFAULT_STORE_ID);

        $this->copyConstructor->build($product, $duplicate);
        $isDuplicateSaved = false;
        do {
            $urlKey = $duplicate->getUrlKey();
            $urlKey = preg_match('/(.*)-(\d+)$/', $urlKey, $matches)
                ? $matches[1] . '-' . ($matches[2] + 1)
                : $urlKey . '-1';
            $duplicate->setUrlKey($urlKey);
            try {
                $duplicate->save();
                $isDuplicateSaved = true;
            } catch (\Magento\Framework\Exception\AlreadyExistsException $e) {
            }
        } while (!$isDuplicateSaved);
        $this->getOptionRepository()->duplicate($product, $duplicate);
        $product->getResource()->duplicate(
            $product->getData($metadata->getLinkField()),
            $duplicate->getData($metadata->getLinkField())
        );
        return $duplicate;
    }

    private function getOptionRepository()
    {
        if (null === $this->optionRepository) {
            $this->optionRepository = \Magento\Framework\App\ObjectManager::getInstance()
                ->get(\Magento\Catalog\Model\Product\Option\Repository::class);
        }
        return $this->optionRepository;
    }

    private function getMetadataPool()
    {
        if (null === $this->metadataPool) {
            $this->metadataPool = \Magento\Framework\App\ObjectManager::getInstance()
                ->get(\Magento\Framework\EntityManager\MetadataPool::class);
        }
        return $this->metadataPool;
    }

    private function removeStockItem(array $productData)
    {
        if (isset($productData[ProductInterface::EXTENSION_ATTRIBUTES_KEY])) {
            $extensionAttributes = $productData[ProductInterface::EXTENSION_ATTRIBUTES_KEY];
            if (null !== $extensionAttributes->getStockItem()) {
                $extensionAttributes->setData('stock_item', null);
            }
        }
        return $productData;
    }
}