ErrorHandler.php

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<?php
namespace TYPO3\CMS\Core\Error;

/*
 * 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!
 */

use TYPO3\CMS\Core\Utility\GeneralUtility;

class ErrorHandler implements ErrorHandlerInterface
{
    protected $exceptionalErrors = [];

    protected $debugMode = false;

    public function __construct($errorHandlerErrors)
    {
        $excludedErrors = E_COMPILE_WARNING | E_COMPILE_ERROR | E_CORE_WARNING | E_CORE_ERROR | E_PARSE | E_ERROR;
        // reduces error types to those a custom error handler can process
        $errorHandlerErrors = $errorHandlerErrors & ~$excludedErrors;
        set_error_handler([$this, 'handleError'], $errorHandlerErrors);
    }

    public function setExceptionalErrors($exceptionalErrors)
    {
        $this->exceptionalErrors = (int)$exceptionalErrors;
    }

    public function setDebugMode($debugMode)
    {
        $this->debugMode = (bool)$debugMode;
    }

    public function handleError($errorLevel, $errorMessage, $errorFile, $errorLine)
    {
        // Don't do anything if error_reporting is disabled by an @ sign
        if (error_reporting() === 0) {
            return true;
        }
        $errorLevels = [
            E_WARNING => 'Warning',
            E_NOTICE => 'Notice',
            E_USER_ERROR => 'User Error',
            E_USER_WARNING => 'User Warning',
            E_USER_NOTICE => 'User Notice',
            E_STRICT => 'Runtime Notice',
            E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
            E_DEPRECATED => 'Runtime Deprecation Notice'
        ];
        $message = 'PHP ' . $errorLevels[$errorLevel] . ': ' . $errorMessage . ' in ' . $errorFile . ' line ' . $errorLine;
        if ($errorLevel & $this->exceptionalErrors) {
            // handle error raised at early parse time
            // autoloader not available & built-in classes not resolvable
            if (!class_exists('stdClass', false)) {
                $message = 'PHP ' . $errorLevels[$errorLevel] . ': ' . $errorMessage . ' in ' . basename($errorFile) .
                    'line ' . $errorLine;
                die($message);
            }
            throw new Exception($message, 1);
        } else {
            switch ($errorLevel) {
                case E_USER_ERROR:
                case E_RECOVERABLE_ERROR:
                    $severity = 2;
                    break;
                case E_USER_WARNING:
                case E_WARNING:
                    $severity = 1;
                    break;
                default:
                    $severity = 0;
            }
            $logTitle = 'Core: Error handler (' . TYPO3_MODE . ')';
            $message = $logTitle . ': ' . $message;
            // Write error message to the configured syslogs,
            // see: $TYPO3_CONF_VARS['SYS']['systemLog']
            if ($errorLevel & $GLOBALS['TYPO3_CONF_VARS']['SYS']['syslogErrorReporting']) {
                GeneralUtility::sysLog($message, 'core', $severity + 1);
            }
            // Write error message to devlog extension(s),
            // see: $TYPO3_CONF_VARS['SYS']['enable_errorDLOG']
            if (TYPO3_ERROR_DLOG) {
                GeneralUtility::devLog($message, 'core', $severity + 1);
            }
            // Write error message to TSlog (admin panel)
            $timeTracker = $this->getTimeTracker();
            if (is_object($timeTracker)) {
                $timeTracker->setTSlogMessage($message, $severity + 1);
            }
            // Write error message to sys_log table (ext: belog, Tools->Log)
            if ($errorLevel & $GLOBALS['TYPO3_CONF_VARS']['SYS']['belogErrorReporting']) {
                // Silently catch in case an error occurs before a database connection exists,
                // but DatabaseConnection fails to connect.
                try {
                    $this->writeLog($message, $severity);
                } catch (\Exception $e) {
                }
            }
            if ($severity === 2) {
                // Let the internal handler continue. This will stop the script
                return false;
            } else {
                if ($this->debugMode) {
                    $flashMessage = GeneralUtility::makeInstance(
                        \TYPO3\CMS\Core\Messaging\FlashMessage::class,
                        $message,
                        'PHP ' . $errorLevels[$errorLevel],
                        $severity
                    );
                    $flashMessageService = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Messaging\FlashMessageService::class);
                    $defaultFlashMessageQueue = $flashMessageService->getMessageQueueByIdentifier();
                    $defaultFlashMessageQueue->enqueue($flashMessage);
                }
                // Don't execute PHP internal error handler
                return true;
            }
        }
    }

    protected function writeLog($logMessage, $severity)
    {
        $databaseConnection = $this->getDatabaseConnection();
        if (is_object($databaseConnection) && $databaseConnection->isConnected()) {
            $userId = 0;
            $workspace = 0;
            $data = [];
            $backendUser = $this->getBackendUser();
            if (is_object($backendUser)) {
                if (isset($backendUser->user['uid'])) {
                    $userId = $backendUser->user['uid'];
                }
                if (isset($backendUser->workspace)) {
                    $workspace = $backendUser->workspace;
                }
                if (!empty($backendUser->user['ses_backuserid'])) {
                    $data['originalUser'] = $backendUser->user['ses_backuserid'];
                }
            }
            $fields_values = [
                'userid' => $userId,
                'type' => 5,
                'action' => 0,
                'error' => $severity,
                'details_nr' => 0,
                'details' => str_replace('%', '%%', $logMessage),
                'log_data' => (empty($data) ? '' : serialize($data)),
                'IP' => (string)GeneralUtility::getIndpEnv('REMOTE_ADDR'),
                'tstamp' => $GLOBALS['EXEC_TIME'],
                'workspace' => $workspace
            ];
            $databaseConnection->exec_INSERTquery('sys_log', $fields_values);
        }
    }

    protected function getTimeTracker()
    {
        return $GLOBALS['TT'];
    }

    protected function getBackendUser()
    {
        return $GLOBALS['BE_USER'];
    }

    protected function getDatabaseConnection()
    {
        return $GLOBALS['TYPO3_DB'];
    }
}