PreventDeleteDefaultStockLinksPlugin.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryCatalog\Plugin\InventoryApi\StockSourceLinksDelete;

use Magento\Framework\Exception\LocalizedException;
use Magento\InventoryApi\Api\StockSourceLinksDeleteInterface;
use Magento\InventoryCatalogApi\Api\DefaultSourceProviderInterface;
use Magento\InventoryCatalogApi\Api\DefaultStockProviderInterface;

class PreventDeleteDefaultStockLinksPlugin
{
    private $defaultStockProvider;

    private $defaultSourceProvider;

    public function __construct(
        DefaultStockProviderInterface $defaultStockProvider,
        DefaultSourceProviderInterface $defaultSourceProvider
    ) {
        $this->defaultStockProvider = $defaultStockProvider;
        $this->defaultSourceProvider = $defaultSourceProvider;
    }

    public function beforeExecute(StockSourceLinksDeleteInterface $subject, array $links)
    {
        foreach ($links as $link) {
            if ($link->getStockId() === $this->defaultStockProvider->getId()
                || $link->getSourceCode() === $this->defaultSourceProvider->getCode()
            ) {
                throw new LocalizedException(__('Can not delete link related to Default Source or Default Stock'));
            }
        }
    }
}