Logo.php

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<?php
namespace Magento\Config\Model\Config\Backend\Email;

class Logo extends \Magento\Config\Model\Config\Backend\Image
{
    const UPLOAD_DIR = 'email/logo';

    protected $_maxFileSize = 2048;

    protected function _getUploadDir()
    {
        return $this->_mediaDirectory->getAbsolutePath($this->_appendScopeInfo(self::UPLOAD_DIR));
    }

    protected function _addWhetherScopeInfo()
    {
        return true;
    }

    protected function getTmpFileName()
    {
        $tmpName = null;
        if (isset($_FILES['groups'])) {
            $tmpName = $_FILES['groups']['tmp_name'][$this->getGroupId()]['fields'][$this->getField()]['value'];
        } else {
            $tmpName = is_array($this->getValue()) ? $this->getValue()['tmp_name'] : null;
        }
        return $tmpName;
    }

    public function beforeSave()
    {
        $value = $this->getValue();
        $deleteFlag = is_array($value) && !empty($value['delete']);
        $fileTmpName = $this->getTmpFileName();

        if ($this->getOldValue() && ($fileTmpName || $deleteFlag)) {
            $this->_mediaDirectory->delete(self::UPLOAD_DIR . '/' . $this->getOldValue());
        }
        return parent::beforeSave();
    }
}