FilterCustomAttribute.php

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<?php
namespace Magento\CatalogInventory\Model\Plugin;

use Magento\Catalog\Model\Product\Attribute\Repository;
use Magento\Catalog\Model\FilterProductCustomAttribute as Filter;

class FilterCustomAttribute
{
    private $filter;

    public function __construct(Filter $filter)
    {
        $this->filter = $filter;
    }

    public function afterGetCustomAttributesMetadata(Repository $repository, array $attributes): array
    {
        $return = [];
        foreach ($attributes as $attribute) {
            $return[$attribute->getAttributeCode()] = $attribute;
        }

        return $this->filter->execute($return);
    }
}