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<?php
/**
* Error handler
*
* Provides Error Capturing for Framework errors.
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Error
* @since CakePHP(tm) v 0.10.5.1732
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

App::uses('Debugger', 'Utility');
App::uses('CakeLog', 'Log');
App::uses('ExceptionRenderer', 'Error');
App::uses('AppController', 'Controller');

/**
*
* Error Handler provides basic error and exception handling for your application. It captures and
* handles all unhandled exceptions and errors. Displays helpful framework errors when debug > 1.
*
* ### Uncaught exceptions
*
* When debug < 1 a CakeException will render 404 or 500 errors. If an uncaught exception is thrown
* and it is a type that ErrorHandler does not know about it will be treated as a 500 error.
*
* ### Implementing application specific exception handling
*
* You can implement application specific exception handling in one of a few ways. Each approach
* gives you different amounts of control over the exception handling process.
*
* - Set Configure::write('Exception.handler', 'YourClass::yourMethod');
* - Create AppController::appError();
* - Set Configure::write('Exception.renderer', 'YourClass');
*
* #### Create your own Exception handler with `Exception.handler`
*
* This gives you full control over the exception handling process. The class you choose should be
* loaded in your app/Config/bootstrap.php, so its available to handle any exceptions. You can
* define the handler as any callback type. Using Exception.handler overrides all other exception
* handling settings and logic.
*
* #### Using `AppController::appError();`
*
* This controller method is called instead of the default exception rendering. It receives the
* thrown exception as its only argument. You should implement your error handling in that method.
* Using AppController::appError(), will supersede any configuration for Exception.renderer.
*
* #### Using a custom renderer with `Exception.renderer`
*
* If you don't want to take control of the exception handling, but want to change how exceptions are
* rendered you can use `Exception.renderer` to choose a class to render exception pages. By default
* `ExceptionRenderer` is used. Your custom exception renderer class should be placed in app/Lib/Error.
*
* Your custom renderer should expect an exception in its constructor, and implement a render method.
* Failing to do so will cause additional errors.
*
* #### Logging exceptions
*
* Using the built-in exception handling, you can log all the exceptions
* that are dealt with by ErrorHandler by setting `Exception.log` to true in your core.php.
* Enabling this will log every exception to CakeLog and the configured loggers.
*
* ### PHP errors
*
* Error handler also provides the built in features for handling php errors (trigger_error).
* While in debug mode, errors will be output to the screen using debugger. While in production mode,
* errors will be logged to CakeLog. You can control which errors are logged by setting
* `Error.level` in your core.php.
*
* #### Logging errors
*
* When ErrorHandler is used for handling errors, you can enable error logging by setting `Error.log` to true.
* This will log all errors to the configured log handlers.
*
* #### Controlling what errors are logged/displayed
*
* You can control which errors are logged / displayed by ErrorHandler by setting `Error.level`. Setting this
* to one or a combination of a few of the E_* constants will only enable the specified errors.
*
* e.g. `Configure::write('Error.level', E_ALL & ~E_NOTICE);`
*
* Would enable handling for all non Notice errors.
*
* @package Cake.Error
* @see ExceptionRenderer for more information on how to customize exception rendering.
*/
class ErrorHandler {

/**
* Set as the default exception handler by the CakePHP bootstrap process.
*
* This will either use custom exception renderer class if configured,
* or use the default ExceptionRenderer.
*
* @param Exception $exception
* @return void
* @see http://php.net/manual/en/function.set-exception-handler.php
*/
public static function handleException(Exception $exception) {
$config = Configure::read('Exception');
if (!empty($config['log'])) {
$message = sprintf("[%s] %s\n%s",
get_class($exception),
$exception->getMessage(),
$exception->getTraceAsString()
);
CakeLog::write(LOG_ERR, $message);
}
$renderer = $config['renderer'];
if ($renderer !== 'ExceptionRenderer') {
list($plugin, $renderer) = pluginSplit($renderer, true);
App::uses($renderer, $plugin . 'Error');
}
try {
$error = new $renderer($exception);
$error->render();
} catch (Exception $e) {
set_error_handler(Configure::read('Error.handler')); // Should be using configured ErrorHandler
Configure::write('Error.trace', false); // trace is useless here since it's internal
$message = sprintf("[%s] %s\n%s", // Keeping same message format
get_class($e),
$e->getMessage(),
$e->getTraceAsString()
);
trigger_error($message, E_USER_ERROR);
}
}

/**
* Set as the default error handler by CakePHP. Use Configure::write('Error.handler', $callback), to use your own
* error handling methods. This function will use Debugger to display errors when debug > 0. And
* will log errors to CakeLog, when debug == 0.
*
* You can use Configure::write('Error.level', $value); to set what type of errors will be handled here.
* Stack traces for errors can be enabled with Configure::write('Error.trace', true);
*
* @param integer $code Code of error
* @param string $description Error description
* @param string $file File on which error occurred
* @param integer $line Line that triggered the error
* @param array $context Context
* @return boolean true if error was handled
*/
public static function handleError($code, $description, $file = null, $line = null, $context = null) {
if (error_reporting() === 0) {
return false;
}
$errorConfig = Configure::read('Error');
list($error, $log) = self::mapErrorCode($code);

$debug = Configure::read('debug');
if ($debug) {
$data = array(
'level' => $log,
'code' => $code,
'error' => $error,
'description' => $description,
'file' => $file,
'line' => $line,
'context' => $context,
'start' => 2,
'path' => Debugger::trimPath($file)
);
return Debugger::getInstance()->outputError($data);
} else {
$message = $error . ' (' . $code . '): ' . $description . ' in [' . $file . ', line ' . $line . ']';
if (!empty($errorConfig['trace'])) {
$trace = Debugger::trace(array('start' => 1, 'format' => 'log'));
$message .= "\nTrace:\n" . $trace . "\n";
}
return CakeLog::write($log, $message);
}
}

/**
* Map an error code into an Error word, and log location.
*
* @param integer $code Error code to map
* @return array Array of error word, and log location.
*/
public static function mapErrorCode($code) {
$error = $log = null;
switch ($code) {
case E_PARSE:
case E_ERROR:
case E_CORE_ERROR:
case E_COMPILE_ERROR:
case E_USER_ERROR:
$error = 'Fatal Error';
$log = LOG_ERROR;
break;
case E_WARNING:
case E_USER_WARNING:
case E_COMPILE_WARNING:
case E_RECOVERABLE_ERROR:
$error = 'Warning';
$log = LOG_WARNING;
break;
case E_NOTICE:
case E_USER_NOTICE:
$error = 'Notice';
$log = LOG_NOTICE;
break;
case E_STRICT:
$error = 'Strict';
$log = LOG_NOTICE;
break;
case E_DEPRECATED:
$error = 'Deprecated';
$log = LOG_NOTICE;
break;
}
return array($error, $log);
}
}
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