<?php
namespace dokuwiki;
use dokuwiki\Exception\FatalException;
/**
* Manage the global handling of errors and exceptions
*
* Developer may use this to log and display exceptions themselves
*/
class ErrorHandler
{
/**
* Standard error codes used in PHP errors
* @see https://www.php.net/manual/en/errorfunc.constants.php
*/
protected const ERRORCODES = [
1 => 'E_ERROR',
2 => 'E_WARNING',
4 => 'E_PARSE',
8 => 'E_NOTICE',
16 => 'E_CORE_ERROR',
32 => 'E_CORE_WARNING',
64 => 'E_COMPILE_ERROR',
128 => 'E_COMPILE_WARNING',
256 => 'E_USER_ERROR',
512 => 'E_USER_WARNING',
1024 => 'E_USER_NOTICE',
2048 => 'E_STRICT',
4096 => 'E_RECOVERABLE_ERROR',
8192 => 'E_DEPRECATED',
16384 => 'E_USER_DEPRECATED',
];
/**
* Register the default error handling
*/
public static function register()
{
if (!defined('DOKU_UNITTEST')) {
set_exception_handler([ErrorHandler::class, 'fatalException']);
register_shutdown_function([ErrorHandler::class, 'fatalShutdown']);
set_error_handler(
[ErrorHandler::class, 'errorHandler'],
E_WARNING | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR
);
}
}
/**
* Default Exception handler to show a nice user message before dieing
*
* The exception is logged to the error log
*
* @param \Throwable $e
*/
public static function fatalException($e)
{
$plugin = self::guessPlugin($e);
$title = hsc(get_class($e) . ': ' . $e->getMessage());
$msg = 'An unforeseen error has occured. This is most likely a bug somewhere.';
if ($plugin) $msg .= ' It might be a problem in the ' . $plugin . ' plugin.';
$logged = self::logException($e)
? 'More info has been written to the DokuWiki error log.'
: $e->getFile() . ':' . $e->getLine();
echo <<<EOT
<!DOCTYPE html>
<html>
<head><title>$title</title></head>
<body style="font-family: Arial, sans-serif">
<div style="width:60%; margin: auto; background-color: #fcc;
border: 1px solid #faa; padding: 0.5em 1em;">
<h1 style="font-size: 120%">$title</h1>
<p>$msg</p>
<p>$logged</p>
</div>
</body>
</html>
EOT;
}
/**
* Convenience method to display an error message for the given Exception
*
* @param \Throwable $e
* @param string $intro
*/
public static function showExceptionMsg($e, $intro = 'Error!')
{
$msg = hsc($intro) . '<br />' . hsc(get_class($e) . ': ' . $e->getMessage());
if (self::logException($e)) $msg .= '<br />More info is available in the error log.';
msg($msg, -1);
}
/**
* Last resort to handle fatal errors that still can't be caught
*/
public static function fatalShutdown()
{
$error = error_get_last();
// Check if it's a core/fatal error, otherwise it's a normal shutdown
if (
$error !== null &&
in_array(
$error['type'],
[
E_ERROR,
E_CORE_ERROR,
E_COMPILE_ERROR,
]
)
) {
self::fatalException(
new FatalException($error['message'], 0, $error['type'], $error['file'], $error['line'])
);
}
}
/**
* Log the given exception to the error log
*
* @param \Throwable $e
* @return bool false if the logging failed
*/
public static function logException($e)
{
if ($e instanceof \ErrorException) {
$prefix = self::ERRORCODES[$e->getSeverity()];
} else {
$prefix = get_class($e);
}
return Logger::getInstance()->log(
$prefix . ': ' . $e->getMessage(),
$e->getTraceAsString(),
$e->getFile(),
$e->getLine()
);
}
/**
* Error handler to log non-exception errors
*
* @param int $errno
* @param string $errstr
* @param string $errfile
* @param int $errline
* @return bool
*/
public static function errorHandler($errno, $errstr, $errfile, $errline)
{
global $conf;
// ignore supressed warnings
if (!(error_reporting() & $errno)) return false;
$ex = new \ErrorException(
$errstr,
0,
$errno,
$errfile,
$errline
);
self::logException($ex);
if ($ex->getSeverity() === E_WARNING && $conf['hidewarnings']) {
return true;
}
return false;
}
/**
* Checks the the stacktrace for plugin files
*
* @param \Throwable $e
* @return false|string
*/
protected static function guessPlugin($e)
{
if (preg_match('/lib\/plugins\/(\w+)\//', str_replace('\\', '/', $e->getFile()), $match)) {
return $match[1];
}
foreach ($e->getTrace() as $line) {
if (
isset($line['class']) &&
preg_match('/\w+?_plugin_(\w+)/', $line['class'], $match)
) {
return $match[1];
}
if (
isset($line['file']) &&
preg_match('/lib\/plugins\/(\w+)\//', str_replace('\\', '/', $line['file']), $match)
) {
return $match[1];
}
}
return false;
}
}