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/home/develito/httpdocs/plugins/system/log/log.php

<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  System.log
 *
 * @copyright   (C) 2007 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Joomla! System Logging Plugin.
 *
 * @since  1.5
 */
class PlgSystemLog extends JPlugin
{
	/**
	 * Called if user fails to be logged in.
	 *
	 * @param   array  $response  Array of response data.
	 *
	 * @return  void
	 *
	 * @since   1.5
	 */
	public function onUserLoginFailure($response)
	{
		$errorlog = array();

switch ($response['status'])
		{
			case JAuthentication::STATUS_SUCCESS:
				$errorlog['status']  = $response['type'] . ' CANCELED: ';
				$errorlog['comment'] = $response['error_message'];
				break;

case JAuthentication::STATUS_FAILURE:
				$errorlog['status']  = $response['type'] . ' FAILURE: ';

if ($this->params->get('log_username', 0))
				{
					$errorlog['comment'] = $response['error_message'] . ' ("' . $response['username'] . '")';
				}
				else
				{
					$errorlog['comment'] = $response['error_message'];
				}
				break;

default:
				$errorlog['status']  = $response['type'] . ' UNKNOWN ERROR: ';
				$errorlog['comment'] = $response['error_message'];
				break;
		}

JLog::addLogger(array(), JLog::INFO);

try
		{
			JLog::add($errorlog['comment'], JLog::INFO, $errorlog['status']);
		}
		catch (Exception $e)
		{
			// If the log file is unwriteable during login then we should not go to the error page
			return;
		}
	}
}