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

namespace Magento\Framework\App\DeploymentConfig;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Config\File\ConfigFilePool;
use Magento\Framework\Exception\FileSystemException;
use Magento\Framework\Exception\RuntimeException;
use Magento\Framework\Filesystem\DriverPool;
use Magento\Framework\Phrase;

/**
* Deployment configuration reader.
* Loads the merged configuration from config files.
* @see FileReader The reader for specific configuration file
*/
class Reader
{
/**
* @var DirectoryList
*/
private $dirList;

/**
* @var ConfigFilePool
*/
private $configFilePool;

/**
* @var DriverPool
*/
private $driverPool;

/**
* Configuration file names
*
* @var array
*/
private $files;

/**
* Constructor
*
* @param DirectoryList $dirList
* @param DriverPool $driverPool
* @param ConfigFilePool $configFilePool
* @param null|string $file
* @throws \InvalidArgumentException
*/
public function __construct(
DirectoryList $dirList,
DriverPool $driverPool,
ConfigFilePool $configFilePool,
$file = null
) {
$this->dirList = $dirList;
$this->configFilePool = $configFilePool;
$this->driverPool = $driverPool;
if (null !== $file) {
if (!preg_match('/^[a-z\d\.\-]+\.php$/i', $file)) {
throw new \InvalidArgumentException("Invalid file name: {$file}");
}
$this->files = [$file];
} else {
$this->files = $this->configFilePool->getPaths();
}
}

/**
* Gets the file name
*
* @return array
*/
public function getFiles()
{
return $this->files;
}

/**
* Method loads merged configuration within all configuration files.
* To retrieve specific file configuration, use FileReader.
* $fileKey option is deprecated since version 2.2.0.
*
* @param string $fileKey The file key (deprecated)
* @return array
* @throws FileSystemException If file can not be read
* @throws RuntimeException If file is invalid
* @throws \Exception If file key is not correct
* @see FileReader
*/
public function load($fileKey = null)
{
$path = $this->dirList->getPath(DirectoryList::CONFIG);
$fileDriver = $this->driverPool->getDriver(DriverPool::FILE);
$result = [];
if ($fileKey) {
$filePath = $path . '/' . $this->configFilePool->getPath($fileKey);
if ($fileDriver->isExists($filePath)) {
$this->refreshCache($filePath);
$result = include $filePath;
if (!is_array($result)) {
throw new RuntimeException(new Phrase("Invalid configuration file: '%1'", [$filePath]));
}
}
} else {
$configFiles = $this->getFiles();
foreach ($configFiles as $file) {
$configFile = $path . '/' . $file;
if ($fileDriver->isExists($configFile)) {
$this->refreshCache($configFile);
$fileData = include $configFile;
if (!is_array($fileData)) {
throw new RuntimeException(new Phrase("Invalid configuration file: '%1'", [$configFile]));
}
} else {
continue;
}
if ($fileData) {
$result = array_replace_recursive($result, $fileData);
}
}
}
return $result ?: [];
}

/**
* Invalidate cache
*
* @param string $filePath
*/
private function refreshCache(string $filePath): void
{
if (function_exists('opcache_invalidate')
&& filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN)) {
opcache_invalidate($filePath);
}
}
}