ProductUrlKeyAutogeneratorObserver.php

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<?php
namespace Magento\CatalogUrlRewrite\Observer;

use Magento\Catalog\Model\Product;
use Magento\CatalogUrlRewrite\Model\ProductUrlPathGenerator;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class ProductUrlKeyAutogeneratorObserver implements ObserverInterface
{
    protected $productUrlPathGenerator;

    public function __construct(ProductUrlPathGenerator $productUrlPathGenerator)
    {
        $this->productUrlPathGenerator = $productUrlPathGenerator;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $product = $observer->getEvent()->getProduct();
        $urlKey = $this->productUrlPathGenerator->getUrlKey($product);
        if (null !== $urlKey) {
            $product->setUrlKey($urlKey);
        }
    }
}