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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
/**
 * Copyright © Extmag. All rights reserved.
 */

namespace Extmag\DhlShipping\Plugin\Controller\Adminhtml\ShipperAccount;

class Save
{
    /**
     * Adding dhl_signature to signature in result
     *
     * @param \Extmag\Shiplab\Controller\Adminhtml\ShipperAccount\Save $subject
     * @param array $result
     * @param array $data
     * @return array
     */
    public function afterCustomCheckData(
        \Extmag\Shiplab\Controller\Adminhtml\ShipperAccount\Save $subject,
        array $result,
        array $data
    ) {
        if ($result['carrier_code'] === 'dhl') {
            if (isset($result['dhl_signature'])
                && is_array($result['dhl_signature']) && empty($result['dhl_signature']['delete'])
            ) {
                if (isset($result['dhl_signature'][0]['name'])) {
                    $result['signature'] = json_encode($result['dhl_signature']);
                } else {
                    unset($result['signature']);
                }
            } else {
                $result['signature'] = '';
            }
        }

        return $result;
    }
}