UpdateConfigurations.php

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<?php
namespace Magento\ConfigurableProduct\Controller\Adminhtml\Product\Initialization\Helper\Plugin;

class UpdateConfigurations
{
    protected $productRepository;

    protected $request;

    protected $variationHandler;

    private $keysPost = [
        'status',
        'sku',
        'name',
        'price',
        'configurable_attribute',
        'weight',
        'media_gallery',
        'swatch_image',
        'small_image',
        'thumbnail',
        'image',
    ];

    public function __construct(
        \Magento\Framework\App\RequestInterface $request,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\ConfigurableProduct\Model\Product\VariationHandler $variationHandler
    ) {
        $this->request = $request;
        $this->productRepository = $productRepository;
        $this->variationHandler = $variationHandler;
    }

    public function afterInitialize(
        \Magento\Catalog\Controller\Adminhtml\Product\Initialization\Helper $subject,
        \Magento\Catalog\Model\Product $configurableProduct
    ) {
        $configurations = $this->getConfigurations();
        $configurations = $this->variationHandler->duplicateImagesForVariations($configurations);
        if (count($configurations)) {
            foreach ($configurations as $productId => $productData) {
                $product = $this->productRepository->getById($productId, false, $this->request->getParam('store', 0));
                $productData = $this->variationHandler->processMediaGallery($product, $productData);
                $product->addData($productData);
                if ($product->hasDataChanges()) {
                    $product->save();
                }
            }
        }
        return $configurableProduct;
    }

    protected function getConfigurations()
    {
        $result = [];
        $configurableMatrix = $this->request->getParam('configurable-matrix-serialized', "[]");
        if (isset($configurableMatrix) && $configurableMatrix != "") {
            $configurableMatrix = json_decode($configurableMatrix, true);

            foreach ($configurableMatrix as $item) {
                if (empty($item['was_changed'])) {
                    continue;
                } else {
                    unset($item['was_changed']);
                }

                if (!$item['newProduct']) {
                    $result[$item['id']] = $this->mapData($item);

                    if (isset($item['qty'])) {
                        $result[$item['id']]['quantity_and_stock_status']['qty'] = $item['qty'];
                    }
                }
            }
        }

        return $result;
    }

    private function mapData(array $item)
    {
        $result = [];

        foreach ($this->keysPost as $key) {
            if (isset($item[$key])) {
                $result[$key] = $item[$key];
            }
        }

        return $result;
    }
}