AttributeProvider.php

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<?php
namespace Magento\Eav\Model;

use Magento\Framework\Model\EntitySnapshot\AttributeProviderInterface;
use Magento\Framework\EntityManager\MetadataPool;
use Magento\Eav\Api\AttributeRepositoryInterface;
use Magento\Framework\Api\SearchCriteriaBuilder;

class AttributeProvider implements AttributeProviderInterface
{
    protected $metadataPool;

    protected $attributeRepository;

    protected $searchCriteriaBuilder;

    public function __construct(
        MetadataPool $metadataPool,
        AttributeRepositoryInterface $attributeRepository,
        SearchCriteriaBuilder $searchCriteriaBuilder
    ) {
        $this->metadataPool = $metadataPool;
        $this->attributeRepository = $attributeRepository;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
    }

    public function getAttributes($entityType)
    {
        $metadata = $this->metadataPool->getMetadata($entityType);
        $searchResult = $this->attributeRepository->getList(
            $metadata->getEavEntityType(),
            $this->searchCriteriaBuilder->addFilter('attribute_set_id', null, 'neq')->create()
        );
        $attributes = [];
        foreach ($searchResult->getItems() as $attribute) {
            $attributes[] = $attribute->getAttributeCode();
        }
        return $attributes;
    }
}