Hash.php

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<?php
namespace Magento\Deploy\Model\DeploymentConfig;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Flag;
use Magento\Framework\Flag\FlagResource;
use Magento\Framework\FlagFactory;

class Hash
{
    const CONFIG_KEY = 'config_hash';

    private $configHashGenerator;

    private $dataConfigCollector;

    private $flagResource;

    private $flagFactory;

    public function __construct(
        Hash\Generator $configHashGenerator,
        DataCollector $dataConfigCollector,
        FlagResource $flagResource,
        FlagFactory $flagFactory
    ) {
        $this->configHashGenerator = $configHashGenerator;
        $this->dataConfigCollector = $dataConfigCollector;
        $this->flagResource = $flagResource;
        $this->flagFactory = $flagFactory;
    }

    public function regenerate($sectionName = null)
    {
        try {
            $hashes = $this->get();
            $configs = $this->dataConfigCollector->getConfig($sectionName);

            foreach ($configs as $section => $config) {
                $hashes[$section] = $this->configHashGenerator->generate($config);
            }

            $flag = $this->getFlagObject();
            $flag->setFlagData($hashes);
            $this->flagResource->save($flag);
        } catch (\Exception $exception) {
            throw new LocalizedException(__("The hash isn't saved."), $exception);
        }
    }

    public function get()
    {
        $flag = $this->getFlagObject();
        return (array) ($flag->getFlagData() ?: []);
    }

    private function getFlagObject()
    {
        $flag = $this->flagFactory
            ->create(['data' => ['flag_code' => self::CONFIG_KEY]]);
        $this->flagResource->load($flag, self::CONFIG_KEY, 'flag_code');
        return $flag;
    }
}