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

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\Serializer\Json;

/**
* Class DesignExceptions
*/
class DesignExceptions
{
/**
* Core store config
*
* @var \Magento\Framework\App\Config\ScopeConfigInterface
*/
protected $scopeConfig;

/**
* Exception config path
*
* @var string
*/
protected $exceptionConfigPath;

/**
* Scope Type
*
* @var string
*/
protected $scopeType;

/**
* @var Json
*/
private $serializer;

/**
* DesignExceptions constructor
*
* @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
* @param string $exceptionConfigPath
* @param string $scopeType
* @param Json|null $serializer
*/
public function __construct(
\Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
$exceptionConfigPath,
$scopeType,
Json $serializer = null
) {
$this->scopeConfig = $scopeConfig;
$this->exceptionConfigPath = $exceptionConfigPath;
$this->scopeType = $scopeType;
$this->serializer = $serializer ?: ObjectManager::getInstance()->get(Json::class);
}

/**
* Get theme that should be applied for current user-agent according to design exceptions configuration
*
* @param \Magento\Framework\App\Request\Http $request
* @return string|bool
*/
public function getThemeByRequest(\Magento\Framework\App\Request\Http $request)
{
$userAgent = $request->getServer('HTTP_USER_AGENT');
if (empty($userAgent)) {
return false;
}
$expressions = $this->scopeConfig->getValue(
$this->exceptionConfigPath,
$this->scopeType
);
if (!$expressions) {
return false;
}
$expressions = $this->serializer->unserialize($expressions);
foreach ($expressions as $rule) {
if (preg_match($rule['regexp'], $userAgent)) {
return $rule['value'];
}
}
return false;
}
}