TypePool.php

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

use Magento\Config\Model\Config\Export\ExcludeList;

class TypePool
{
    const TYPE_SENSITIVE = 'sensitive';

    const TYPE_ENVIRONMENT = 'environment';

    private $sensitive;

    private $environment;

    private $filteredPaths;

    private $excludeList;

    public function __construct(array $sensitive = [], array $environment = [], ExcludeList $excludeList = null)
    {
        $this->sensitive = $sensitive;
        $this->environment = $environment;
        $this->excludeList = $excludeList;
    }

    public function isPresent($path, $type)
    {
        if (!isset($this->filteredPaths[$type])) {
            $this->filteredPaths[$type] = $this->getPathsByType($type);
        }

        $isPresent = in_array($path, $this->filteredPaths[$type]);

        if ($type == self::TYPE_SENSITIVE
            && !$isPresent
            && $this->excludeList instanceof ExcludeList
        ) {
            $isPresent = $this->excludeList->isPresent($path);
        }

        return $isPresent;
    }

    private function getPathsByType($type)
    {
        switch ($type) {
            case self::TYPE_SENSITIVE:
                $paths = $this->sensitive;
                break;
            case self::TYPE_ENVIRONMENT:
                $paths = $this->environment;
                break;
            default:
                return [];
        }

        return array_keys(array_filter(
            $paths,
            function ($value) {
                return filter_var($value, FILTER_VALIDATE_BOOLEAN);
            }
        ));
    }
}