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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Exception;
use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Error\AbstractRenderer;
use Joomla\CMS\Factory;
use Joomla\CMS\Log\Log;
// phpcs:disable PSR1.Files.SideEffects
\defined('JPATH_PLATFORM') or die;
// phpcs:enable PSR1.Files.SideEffects
/**
* Displays the custom error page when an uncaught exception occurs.
*
* @since 3.0
*/
class ExceptionHandler
{
/**
* Handles an error triggered with the E_USER_DEPRECATED level.
*
* @param integer $errorNumber The level of the raised error, represented by the E_* constants.
* @param string $errorMessage The error message.
* @param string $errorFile The file the error was triggered from.
* @param integer $errorLine The line number the error was triggered from.
*
* @return boolean
*
* @since 4.0.0
*/
public static function handleUserDeprecatedErrors(int $errorNumber, string $errorMessage, string $errorFile, int $errorLine): bool
{
// We only want to handle user deprecation messages, these will be triggered in code
if ($errorNumber === E_USER_DEPRECATED) {
try {
Log::add("$errorMessage - $errorFile - Line $errorLine", Log::WARNING, 'deprecated');
} catch (\Exception $e) {
// Silence
}
// If debug mode is enabled, we want to let PHP continue to handle the error; otherwise, we can bail early
if (\defined('JDEBUG') && JDEBUG) {
return true;
}
}
// Always return false, this will tell PHP to handle the error internally
return false;
}
/**
* Handles exceptions: logs errors and renders error page.
*
* @param \Exception|\Throwable $error An Exception or Throwable (PHP 7+) object for which to render the error page.
*
* @return void
*
* @since 3.10.0
*/
public static function handleException(\Throwable $error)
{
static::logException($error);
static::render($error);
}
/**
* Render the error page based on an exception.
*
* @param \Throwable $error An Exception or Throwable (PHP 7+) object for which to render the error page.
*
* @return void
*
* @since 3.0
*/
public static function render(\Throwable $error)
{
try {
$app = Factory::getApplication();
// Flag if we are on cli
$isCli = $app->isClient('cli');
// If site is offline and it's a 404 error, just go to index (to see offline message, instead of 404)
if (!$isCli && $error->getCode() == '404' && $app->get('offline') == 1) {
$app->redirect('index.php');
}
// Clear all opened Output buffers to prevent misrendering
for ($i = 0, $l = ob_get_level(); $i < $l; $i++) {
ob_end_clean();
}
/*
* Try and determine the format to render the error page in
*
* First we check if a Document instance was registered to Factory and use the type from that if available
* If a type doesn't exist for that format, we try to use the format from the application's Input object
* Lastly, if all else fails, we default onto the HTML format to at least render something
*/
if (Factory::$document) {
$format = Factory::$document->getType();
} else {
$format = $app->getInput()->getString('format', 'html');
}
try {
$renderer = AbstractRenderer::getRenderer($format);
} catch (\InvalidArgumentException $e) {
// Default to the HTML renderer
$renderer = AbstractRenderer::getRenderer('html');
}
// Reset the document object in the factory, this gives us a clean slate and lets everything render properly
Factory::$document = $renderer->getDocument();
Factory::getApplication()->loadDocument(Factory::$document);
$data = $renderer->render($error);
// If nothing was rendered, just use the message from the Exception
if (empty($data)) {
$data = $error->getMessage();
}
if ($isCli) {
echo $data;
} else {
/** @var CMSApplication $app */
// Do not allow cache
$app->allowCache(false);
$app->setBody($data);
}
// This return is needed to ensure the test suite does not trigger the non-Exception handling below
return;
} catch (\Throwable $errorRendererError) {
// Pass the error down
}
/*
* To reach this point in the code means there was an error creating the error page.
*
* Let global handler to handle the error, @see bootstrap.php
*/
if (isset($errorRendererError)) {
/*
* Here the thing, at this point we have 2 exceptions:
* $errorRendererError - the error caused by error renderer
* $error - the main error
*
* We need to show both exceptions, without loss of trace information, so use a bit of magic to merge them.
*
* Use exception nesting feature: rethrow the exceptions, an exception thrown in a finally block
* will take unhandled exception as previous.
* So PHP will add $error Exception as previous to $errorRendererError Exception to keep full error stack.
*/
try {
try {
throw $error;
} finally {
throw $errorRendererError;
}
} catch (\Throwable $finalError) {
throw $finalError;
}
} else {
throw $error;
}
}
/**
* Checks if given error belong to PHP exception class (\Throwable for PHP 7+, \Exception for PHP 5-).
*
* @param mixed $error Any error value.
*
* @return boolean
*
* @since 3.10.0
*/
protected static function isException($error)
{
return $error instanceof \Throwable;
}
/**
* Logs exception, catching all possible errors during logging.
*
* @param \Throwable $error An Exception or Throwable (PHP 7+) object to get error message from.
*
* @return void
*
* @since 3.10.0
*/
protected static function logException(\Throwable $error)
{
// Try to log the error, but don't let the logging cause a fatal error
try {
Log::add(
sprintf(
'Uncaught Throwable of type %1$s thrown with message "%2$s". Stack trace: %3$s',
\get_class($error),
$error->getMessage(),
$error->getTraceAsString()
),
Log::CRITICAL,
'error'
);
} catch (\Throwable $e) {
// Logging failed, don't make a stink about it though
}
}
}