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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

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

namespace Extmag\Shiplab\Controller\Adminhtml\ShippingMethods;

use Exception;
use Magento\Backend\App\Action;
use Magento\Backend\App\Action\Context;
use Magento\Catalog\Model\ImageUploader;
use Magento\Framework\App\Action\HttpPostActionInterface;
use Magento\Framework\Controller\ResultFactory;
use Magento\Framework\Controller\ResultInterface;

class CarrierLogoUpload extends Action implements HttpPostActionInterface
{
    /**
     * @var ImageUploader
     */
    protected $imageUploader;

    /**
     * Upload constructor.
     *
     * @param Context       $context
     * @param ImageUploader $imageUploader
     */
    public function __construct(
        Context $context,
        ImageUploader $imageUploader
    ) {
        parent::__construct($context);
        $this->imageUploader = $imageUploader;
    }

    /**
     * Check admin permissions for this controller
     *
     * @return boolean
     */
    protected function _isAllowed()
    {
        return $this->_authorization->isAllowed('Extmag_Shiplab::shiplab_shippingmethods_save');
    }

    /**
     * Upload file controller action
     *
     * @return ResultInterface
     */
    public function execute()
    {
        try {
            $result = $this->imageUploader->saveFileToTmpDir('logo');
        } catch (Exception $e) {
            $result = ['error' => $e->getMessage(), 'errorcode' => $e->getCode()];
        }

        return $this->resultFactory->create(ResultFactory::TYPE_JSON)->setData($result);
    }
}