<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/

namespace Magento\Framework\HTTP;

/**
* Library for working with HTTP headers
*/
class Header
{
/**
* Request object
*
* @var \Magento\Framework\App\RequestInterface
*/
protected $_request;

/**
* @var \Magento\Framework\Stdlib\StringUtils
*/
protected $_converter;

/**
* @param \Magento\Framework\App\RequestInterface $httpRequest
* @param \Magento\Framework\Stdlib\StringUtils $converter
*/
public function __construct(
\Magento\Framework\App\RequestInterface $httpRequest,
\Magento\Framework\Stdlib\StringUtils $converter
) {
$this->_request = $httpRequest;
$this->_converter = $converter;
}

/**
* Retrieve HTTP HOST
*
* @param boolean $clean clean non UTF-8 characters
* @return string
*/
public function getHttpHost($clean = true)
{
return $this->_getHttpCleanValue('HTTP_HOST', $clean);
}

/**
* Retrieve HTTP USER AGENT
*
* @param boolean $clean clean non UTF-8 characters
* @return string
*/
public function getHttpUserAgent($clean = true)
{
return $this->_getHttpCleanValue('HTTP_USER_AGENT', $clean);
}

/**
* Retrieve HTTP ACCEPT LANGUAGE
*
* @param boolean $clean clean non UTF-8 characters
* @return string
*/
public function getHttpAcceptLanguage($clean = true)
{
return $this->_getHttpCleanValue('HTTP_ACCEPT_LANGUAGE', $clean);
}

/**
* Retrieve HTTP ACCEPT CHARSET
*
* @param boolean $clean clean non UTF-8 characters
* @return string
*/
public function getHttpAcceptCharset($clean = true)
{
return $this->_getHttpCleanValue('HTTP_ACCEPT_CHARSET', $clean);
}

/**
* Retrieve HTTP REFERER
*
* @param boolean $clean clean non UTF-8 characters
* @return string
*/
public function getHttpReferer($clean = true)
{
return $this->_getHttpCleanValue('HTTP_REFERER', $clean);
}

/**
* Returns the REQUEST_URI taking into account
* platform differences between Apache and IIS
*
* @param boolean $clean clean non UTF-8 characters
* @return string
*/
public function getRequestUri($clean = false)
{
$uri = $this->_request->getRequestUri();
if ($clean) {
$uri = $this->_converter->cleanString($uri);
}
return $uri;
}

/**
* Retrieve HTTP "clean" value
*
* @param string $var
* @param boolean $clean clean non UTF-8 characters
* @return string
*/
protected function _getHttpCleanValue($var, $clean = true)
{
$value = $this->_request->getServer($var, '');
if ($clean) {
$value = $this->_converter->cleanString($value);
}

return $value;
}
}