ImageTypeProcessor.php

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<?php
namespace Magento\CatalogImportExport\Model\Import\Product;

use Magento\CatalogImportExport\Model\Import\Proxy\Product\ResourceModel;

class ImageTypeProcessor
{
    private $resourceFactory;

    public function __construct(
        \Magento\CatalogImportExport\Model\Import\Proxy\Product\ResourceModelFactory $resourceFactory
    ) {
        $this->resourceFactory = $resourceFactory;
    }

    public function getImageTypes()
    {
        $imageKeys = [];
        $resource = $this->resourceFactory->create();
        $connection = $resource->getConnection();
        $select = $connection->select();
        $select->from(
            $resource->getTable('eav_attribute'),
            ['code' => 'attribute_code']
        );
        $select->where(
            'frontend_input = :frontend_input'
        );
        $bind = [':frontend_input' => 'media_image'];

        $imageKeys   = $connection->fetchCol($select, $bind);
        $imageKeys[] = '_media_image';

        return $imageKeys;
    }
}