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<?php
/**
* This file contains the error handler application component.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CErrorHandler handles uncaught PHP errors and exceptions.
*
* It displays these errors using appropriate views based on the
* nature of the error and the mode the application runs at.
* It also chooses the most preferred language for displaying the error.
*
* CErrorHandler uses two sets of views:
* <ul>
* <li>development views, named as <code>exception.php</code>;
* <li>production views, named as <code>error<StatusCode>.php</code>;
* </ul>
* where <StatusCode> stands for the HTTP error code (e.g. error500.php).
* Localized views are named similarly but located under a subdirectory
* whose name is the language code (e.g. zh_cn/error500.php).
*
* Development views are displayed when the application is in debug mode
* (i.e. YII_DEBUG is defined as true). Detailed error information with source code
* are displayed in these views. Production views are meant to be shown
* to end-users and are used when the application is in production mode.
* For security reasons, they only display the error message without any
* sensitive information.
*
* CErrorHandler looks for the view templates from the following locations in order:
* <ol>
* <li><code>themes/ThemeName/views/system</code>: when a theme is active.</li>
* <li><code>protected/views/system</code></li>
* <li><code>framework/views</code></li>
* </ol>
* If the view is not found in a directory, it will be looked for in the next directory.
*
* The property {@link maxSourceLines} can be changed to specify the number
* of source code lines to be displayed in development views.
*
* CErrorHandler is a core application component that can be accessed via
* {@link CApplication::getErrorHandler()}.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id: CErrorHandler.php 1053 2009-05-23 02:34:03Z qiang.xue $
* @package system.base
* @since 1.0
*/
class CErrorHandler extends CApplicationComponent
{
/**
* @var integer maximum number source code lines to be displayed. Defaults to 25.
*/
public $maxSourceLines=25;
/**
* @var string the application administrator information (could be a name or email link). It is displayed in error pages to end users. Defaults to 'the webmaster'.
*/
public $adminInfo='the webmaster';
/**
* @var boolean whether to discard any existing page output before error display. Defaults to true.
*/
public $discardOutput=true;
/**
* @var string the route (e.g. 'site/error') to the controller action that will be used to display external errors.
* Inside the action, it can retrieve the error information by Yii::app()->errorHandler->error.
* This property defaults to null, meaning CErrorHandler will handle the error display.
* @since 1.0.6
*/
public $errorAction;
private $_error;
/**
* Handles the exception/error event.
* This method is invoked by the application whenever it captures
* an exception or PHP error.
* @param CEvent the event containing the exception/error information
*/
public function handle($event)
{
// set event as handled to prevent it from being handled by other event handlers
$event->handled=true;
if($this->discardOutput)
{
while(@ob_end_clean()) ;
}
if($event instanceof CExceptionEvent)
$this->handleException($event->exception);
else // CErrorEvent
$this->handleError($event);
}
/**
* Returns the details about the error that is currently being handled.
* The error is returned in terms of an array, with the following information:
* <ul>
* <li>code - the HTTP status code (e.g. 403, 500)</li>
* <li>type - the error type (e.g. 'CHttpException', 'PHP Error')</li>
* <li>message - the error message</li>
* <li>file - the name of the PHP script file where the error occurs</li>
* <li>line - the line number of the code where the error occurs</li>
* <li>trace - the call stack of the error</li>
* <li>source - the context source code where the error occurs</li>
* </ul>
* @return array the error details. Null if there is no error.
* @since 1.0.6
*/
public function getError()
{
return $this->_error;
}
/**
* Handles the exception.
* @param Exception the exception captured
*/
protected function handleException($exception)
{
$app=Yii::app();
if($app instanceof CWebApplication)
{
if(($trace=$this->getExactTrace($exception))===null)
{
$fileName=$exception->getFile();
$errorLine=$exception->getLine();
}
else
{
$fileName=$trace['file'];
$errorLine=$trace['line'];
}
$this->_error=$data=array(
'code'=>($exception instanceof CHttpException)?$exception->statusCode:500,
'type'=>get_class($exception),
'message'=>$exception->getMessage(),
'file'=>$fileName,
'line'=>$errorLine,
'trace'=>$exception->getTraceAsString(),
'source'=>$this->getSourceLines($fileName,$errorLine),
);
if(!headers_sent())
header("HTTP/1.0 {$data['code']} ".get_class($exception));
if($exception instanceof CHttpException || !YII_DEBUG)
$this->render('error',$data);
else
$this->render('exception',$data);
}
else
$app->displayException($exception);
}
/**
* Handles the PHP error.
* @param CErrorEvent the PHP error event
*/
protected function handleError($event)
{
$trace=debug_backtrace();
// skip the first 3 stacks as they do not tell the error position
if(count($trace)>3)
$trace=array_slice($trace,3);
$traceString='';
foreach($trace as $i=>$t)
{
if(!isset($t['file']))
$t['file']='unknown';
if(!isset($t['line']))
$t['line']=0;
if(!isset($t['function']))
$t['function']='unknown';
$traceString.="#$i {$t['file']}({$t['line']}): ";
if(isset($t['object']) && is_object($t['object']))
$traceString.=get_class($t['object']).'->';
$traceString.="{$t['function']}()\n";
}
$app=Yii::app();
if($app instanceof CWebApplication)
{
$this->_error=$data=array(
'code'=>500,
'type'=>'PHP Error',
'message'=>$event->message,
'file'=>$event->file,
'line'=>$event->line,
'trace'=>$traceString,
'source'=>$this->getSourceLines($event->file,$event->line),
);
if(!headers_sent())
header("HTTP/1.0 500 PHP Error");
if(YII_DEBUG)
$this->render('exception',$data);
else
$this->render('error',$data);
}
else
$app->displayError($event->code,$event->message,$event->file,$event->line);
}
/**
* @param Exception the uncaught exception
* @return array the exact trace where the problem occurs
*/
protected function getExactTrace($exception)
{
$traces=$exception->getTrace();
$result=null;
foreach($traces as $trace)
{
// property access exception
if(isset($trace['function']) && ($trace['function']==='__get' || $trace['function']==='__set'))
return $trace;
}
return null;
}
/**
* Renders the view.
* @param string the view name (file name without extension).
* See {@link getViewFile} for how a view file is located given its name.
* @param array data to be passed to the view
*/
protected function render($view,$data)
{
if($view==='error' && $this->errorAction!==null)
Yii::app()->runController($this->errorAction);
else
{
// additional information to be passed to view
$data['version']=$this->getVersionInfo();
$data['time']=time();
$data['admin']=$this->adminInfo;
include($this->getViewFile($view,$data['code']));
}
}
/**
* Determines which view file should be used.
* @param string view name (either 'exception' or 'error')
* @param integer HTTP status code
* @return string view file path
*/
protected function getViewFile($view,$code)
{
$viewPaths=array(
Yii::app()->getTheme()===null ? null : Yii::app()->getTheme()->getSystemViewPath(),
Yii::app() instanceof CWebApplication ? Yii::app()->getSystemViewPath() : null,
YII_PATH.DIRECTORY_SEPARATOR.'views',
);
foreach($viewPaths as $i=>$viewPath)
{
if($viewPath!==null)
{
$viewFile=$this->getViewFileInternal($viewPath,$view,$code,$i===2?'en_us':null);
if(is_file($viewFile))
return $viewFile;
}
}
}
/**
* Looks for the view under the specified directory.
* @param string the directory containing the views
* @param string view name (either 'exception' or 'error')
* @param integer HTTP status code
* @param string the language that the view file is in
* @return string view file path
*/
protected function getViewFileInternal($viewPath,$view,$code,$srcLanguage=null)
{
$app=Yii::app();
if($view==='error')
{
$viewFile=$app->findLocalizedFile($viewPath.DIRECTORY_SEPARATOR."error{$code}.php",$srcLanguage);
if(!is_file($viewFile))
$viewFile=$app->findLocalizedFile($viewPath.DIRECTORY_SEPARATOR.'error.php',$srcLanguage);
}
else
$viewFile=$app->findLocalizedFile($viewPath.DIRECTORY_SEPARATOR."exception.php",$srcLanguage);
return $viewFile;
}
/**
* @return string server version information. If the application is in production mode, nothing is returned.
*/
protected function getVersionInfo()
{
if(YII_DEBUG)
{
$version='<a href="http://www.yiiframework.com/">Yii Framework</a>/'.Yii::getVersion();
if(isset($_SERVER['SERVER_SOFTWARE']))
$version=$_SERVER['SERVER_SOFTWARE'].' '.$version;
}
else
$version='';
return $version;
}
/**
* Returns the source lines around the error line.
* At most {@link maxSourceLines} lines will be returned.
* @param string source file path
* @param integer the error line number
* @return array source lines around the error line, indxed by line numbers
*/
protected function getSourceLines($file,$line)
{
// determine the max number of lines to display
$maxLines=$this->maxSourceLines;
if($maxLines<1)
$maxLines=1;
else if($maxLines>100)
$maxLines=100;
$line--; // adjust line number to 0-based from 1-based
if($line<0 || ($lines=@file($file))===false || ($lineCount=count($lines))<=$line)
return array();
$halfLines=(int)($maxLines/2);
$beginLine=$line-$halfLines>0?$line-$halfLines:0;
$endLine=$line+$halfLines<$lineCount?$line+$halfLines:$lineCount-1;
$sourceLines=array();
for($i=$beginLine;$i<=$endLine;++$i)
$sourceLines[$i+1]=$lines[$i];
return $sourceLines;
}
}