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Editing: ExceptionHandler.php

<?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;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Error\AbstractRenderer;
use Joomla\CMS\Factory;
use Joomla\CMS\Log\Log;

/**
 * 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)
		{
			Log::add(
				$errorMessage,
				Log::WARNING,
				'deprecated'
			);

// 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');
			}

/*
			 * 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->input->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
		}
	}
}

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