Sortby.php

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<?php
namespace Magento\Catalog\Model\Category\Attribute\Source;

class Sortby extends \Magento\Eav\Model\Entity\Attribute\Source\AbstractSource
{
    protected $_catalogConfig;

    public function __construct(\Magento\Catalog\Model\Config $catalogConfig)
    {
        $this->_catalogConfig = $catalogConfig;
    }

    protected function _getCatalogConfig()
    {
        return $this->_catalogConfig;
    }

    public function getAllOptions()
    {
        if ($this->_options === null) {
            $this->_options = [['label' => __('Position'), 'value' => 'position']];
            foreach ($this->_getCatalogConfig()->getAttributesUsedForSortBy() as $attribute) {
                $this->_options[] = [
                    'label' => __($attribute['frontend_label']),
                    'value' => $attribute['attribute_code'],
                ];
            }
        }
        return $this->_options;
    }
}