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<?php
/**
* CLogFilter class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CLogFilter preprocesses the logged messages before they are handled by a log route.
*
* CLogFilter is meant to be used by a log route to preprocess the logged messages
* before they are handled by the route. The default implementation of CLogFilter
* prepends additional context information to the logged messages. In particular,
* by setting {@link logVars}, predefined PHP variables such as
* $_SERVER, $_POST, etc. can be saved as a log message, which may help identify/debug
* issues encountered.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.logging
*/
class CLogFilter extends CComponent implements ILogFilter
{
/**
* @var boolean whether to prefix each log message with the current user session ID.
* Defaults to false.
*/
public $prefixSession=false;
/**
* @var boolean whether to prefix each log message with the current user
* {@link CWebUser::name name} and {@link CWebUser::id ID}. Defaults to false.
*/
public $prefixUser=false;
/**
* @var boolean whether to log the current user name and ID. Defaults to true.
*/
public $logUser=true;
/**
* @var array list of the PHP predefined variables that should be logged.
* Note that a variable must be accessible via $GLOBALS. Otherwise it won't be logged.
*/
public $logVars=array('_GET','_POST','_FILES','_COOKIE','_SESSION','_SERVER');


/**
* Filters the given log messages.
* This is the main method of CLogFilter. It processes the log messages
* by adding context information, etc.
* @param array $logs the log messages
* @return array
*/
public function filter(&$logs)
{
if (!empty($logs))
{
if(($message=$this->getContext())!=='')
array_unshift($logs,array($message,CLogger::LEVEL_INFO,'application',YII_BEGIN_TIME));
$this->format($logs);
}
return $logs;
}

/**
* Formats the log messages.
* The default implementation will prefix each message with session ID
* if {@link prefixSession} is set true. It may also prefix each message
* with the current user's name and ID if {@link prefixUser} is true.
* @param array $logs the log messages
*/
protected function format(&$logs)
{
$prefix='';
if($this->prefixSession && ($id=session_id())!=='')
$prefix.="[$id]";
if($this->prefixUser && ($user=Yii::app()->getComponent('user',false))!==null)
$prefix.='['.$user->getName().']['.$user->getId().']';
if($prefix!=='')
{
foreach($logs as &$log)
$log[0]=$prefix.' '.$log[0];
}
}

/**
* Generates the context information to be logged.
* The default implementation will dump user information, system variables, etc.
* @return string the context information. If an empty string, it means no context information.
*/
protected function getContext()
{
$context=array();
if($this->logUser && ($user=Yii::app()->getComponent('user',false))!==null)
$context[]='User: '.$user->getName().' (ID: '.$user->getId().')';

foreach($this->logVars as $name)
{
if(!empty($GLOBALS[$name]))
$context[]="\${$name}=".var_export($GLOBALS[$name],true);
}

return implode("\n\n",$context);
}
}
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