<?php

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Core\Log\Writer;

use TYPO3\CMS\Core\Log\LogLevel;
use TYPO3\CMS\Core\Log\LogRecord;

/**
 * Log writer that writes to syslog
 */
class SyslogWriter extends AbstractWriter
{
    /**
     * List of valid syslog facility names.
     * private as it's not supposed to be changed.
     *
     * @var array<string, int> Facilities
     */
    private $facilities = [
        'auth' => LOG_AUTH,
        'authpriv' => LOG_AUTHPRIV,
        'cron' => LOG_CRON,
        'daemon' => LOG_DAEMON,
        'kern' => LOG_KERN,
        'lpr' => LOG_LPR,
        'mail' => LOG_MAIL,
        'news' => LOG_NEWS,
        'syslog' => LOG_SYSLOG,
        'user' => LOG_USER,
        'uucp' => LOG_UUCP,
    ];

    /**
     * Type of program that is logging to syslog.
     *
     * @var int
     */
    protected $facility = LOG_USER;

    /**
     * Constructor, adds facilities on *nix environments.
     *
     * @param array $options Configuration options
     * @throws \RuntimeException if connection to syslog cannot be opened
     * @see \TYPO3\CMS\Core\Log\Writer\AbstractWriter
     */
    public function __construct(array $options = [])
    {
        // additional facilities for *nix environments
        if (!defined('PHP_WINDOWS_VERSION_BUILD')) {
            $this->facilities['local0'] = LOG_LOCAL0;
            $this->facilities['local1'] = LOG_LOCAL1;
            $this->facilities['local2'] = LOG_LOCAL2;
            $this->facilities['local3'] = LOG_LOCAL3;
            $this->facilities['local4'] = LOG_LOCAL4;
            $this->facilities['local5'] = LOG_LOCAL5;
            $this->facilities['local6'] = LOG_LOCAL6;
            $this->facilities['local7'] = LOG_LOCAL7;
        }
        parent::__construct($options);
        openlog('TYPO3', LOG_ODELAY | LOG_PID, $this->facility);
    }

    /**
     * Destructor, closes connection to syslog.
     */
    public function __destruct()
    {
        closelog();
    }

    /**
     * Sets the facility to use when logging to syslog.
     *
     * @param string $facility Facility to use when logging.
     */
    public function setFacility($facility): void
    {
        if (array_key_exists(strtolower($facility), $this->facilities)) {
            $this->facility = $this->facilities[strtolower($facility)];
        }
    }

    /**
     * Returns the data of the record in syslog format
     */
    public function getMessageForSyslog(LogRecord $record): string
    {
        $data = '';
        $context = $record->getData();
        $message = $record->getMessage();
        if (!empty($context)) {
            // Fold an exception into the message, and string-ify it into context so it can be jsonified.
            if (isset($context['exception']) && $context['exception'] instanceof \Throwable) {
                $message .= $this->formatException($context['exception']);
                $context['exception'] = (string)$context['exception'];
            }
            $data = '- ' . json_encode($context);
        }

        return sprintf(
            '[request="%s" component="%s"] %s %s',
            $record->getRequestId(),
            $record->getComponent(),
            $this->interpolate($message, $context),
            $data
        );
    }

    /**
     * Writes the log record to syslog
     *
     * @return \TYPO3\CMS\Core\Log\Writer\WriterInterface
     */
    public function writeLog(LogRecord $record)
    {
        syslog(LogLevel::normalizeLevel($record->getLevel()), $this->getMessageForSyslog($record));
        return $this;
    }
}
