RequestData.php

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

class RequestData implements \Magento\Config\Model\Config\Backend\File\RequestData\RequestDataInterface
{
    public function getTmpName($path)
    {
        return $this->_getParam('tmp_name', $path);
    }

    public function getName($path)
    {
        return $this->_getParam('name', $path);
    }

    protected function _getParam($paramName, $path)
    {
        $pathParts = explode('/', $path);
        array_shift($pathParts);
        $fieldId = array_pop($pathParts);
        $firstGroupId = array_shift($pathParts);
        if (!isset($_FILES['groups'][$paramName])) {
            return null;
        }
        $groupData = $_FILES['groups'][$paramName];
        if (isset($groupData[$firstGroupId])) {
            $groupData = $groupData[$firstGroupId];
        }
        foreach ($pathParts as $groupId) {
            if (isset($groupData['groups'][$groupId])) {
                $groupData = $groupData['groups'][$groupId];
            } else {
                return null;
            }
        }
        if (isset($groupData['fields'][$fieldId]['value'])) {
            return $groupData['fields'][$fieldId]['value'];
        }
        return null;
    }
}