Syslog in Slack posten

ext_localconf.php

<?php

// ...
$TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLog'][] = \Foo\Bar\Hooks\Systemlog::class . '->customLog';
// ...

Systemlog.php

<?php
namespace Foo\Bar\Hooks;

use TYPO3\CMS\Core\Utility\GeneralUtility;

class Systemlog
{

    private $severityLabel = [
            GeneralUtility::SYSLOG_SEVERITY_INFO => 'INFO',
            GeneralUtility::SYSLOG_SEVERITY_NOTICE => 'NOTICE',
            GeneralUtility::SYSLOG_SEVERITY_WARNING => 'WARNING',
            GeneralUtility::SYSLOG_SEVERITY_ERROR => 'ERROR',
            GeneralUtility::SYSLOG_SEVERITY_FATAL => 'FATAL',
    ];
  
    protected $slackHook = 'https://hooks.slack.com/services/ABC/DEF'; // Adjust me // TODO move to config
    protected $channel = '#foobar'; // Adjust me // TODO move to config

    /**
     * @param array $params 'msg', 'extKey', 'backTrace', 'severity'
     * @param $ref
     */
    public function customLog($params, $ref)
    {
        if (preg_match('/^Uncaught TYPO3 Exception:/', $params['msg'])
                && !preg_match('/#1417988921:/', $params['msg']) // ignore CSFR protection errors
        ) {
            $this->sendSlackMessage($params['extKey'], $params['msg'], $params['severity']);
        }
    }

    /**
     * @param string $msg
     */
    protected function sendSlackMessage($extKey, $msg, $severity)
    {
        $slackClient = new \Maknz\Slack\Client(
                $this->slackHook,
                [
                        'username' => $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'],
                        'channel' => $this->channel,
                        'link_names' => true,
                        'icon' => ':unicorn_face:',
                ],
                new \GuzzleHttp\Client(['verify' => false])
        );
        /** @noinspection PhpUndefinedMethodInspection */
        $slackClient->send(
                $this->severityLabel[$severity] . ': ' .
                str_replace('|', "\n", $msg) .
                ($extKey ? ' (EXT: ' .  $extKey . ')' : '' ) .
                // "\n @channel "
        );
    }
}