Logger.php

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<?php
namespace Magento\Payment\Model\Method;

use Magento\Payment\Gateway\ConfigInterface;
use Psr\Log\LoggerInterface;

class Logger
{
    const DEBUG_KEYS_MASK = '****';

    protected $logger;

    private $config;

    public function __construct(
        LoggerInterface $logger,
        ConfigInterface $config = null
    ) {
        $this->logger = $logger;
        $this->config = $config;
    }

    public function debug(array $data, array $maskKeys = null, $forceDebug = null)
    {
        $maskKeys = $maskKeys !== null ? $maskKeys : $this->getDebugReplaceFields();
        $debugOn = $forceDebug !== null ? $forceDebug : $this->isDebugOn();
        if ($debugOn === true) {
            $data = $this->filterDebugData(
                $data,
                $maskKeys
            );
            $this->logger->debug(var_export($data, true));
        }
    }

    private function getDebugReplaceFields()
    {
        if ($this->config && $this->config->getValue('debugReplaceKeys')) {
            return explode(',', $this->config->getValue('debugReplaceKeys'));
        }
        return [];
    }

    private function isDebugOn()
    {
        return $this->config && (bool)$this->config->getValue('debug');
    }

    protected function filterDebugData(array $debugData, array $debugReplacePrivateDataKeys)
    {
        $debugReplacePrivateDataKeys = array_map('strtolower', $debugReplacePrivateDataKeys);

        foreach (array_keys($debugData) as $key) {
            if (in_array(strtolower($key), $debugReplacePrivateDataKeys)) {
                $debugData[$key] = self::DEBUG_KEYS_MASK;
            } elseif (is_array($debugData[$key])) {
                $debugData[$key] = $this->filterDebugData($debugData[$key], $debugReplacePrivateDataKeys);
            }
        }
        return $debugData;
    }
}