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<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 3.3.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Error\Middleware;
use Cake\Core\App;
use Cake\Core\Configure;
use Cake\Core\Exception\Exception as CakeException;
use Cake\Core\InstanceConfigTrait;
use Cake\Error\ExceptionRenderer;
use Cake\Error\PHP7ErrorException;
use Cake\Log\Log;
use Error;
use Exception;
use Throwable;
/**
* Error handling middleware.
*
* Traps exceptions and converts them into HTML or content-type appropriate
* error pages using the CakePHP ExceptionRenderer.
*
* @mixin \Cake\Core\InstanceConfigTrait
*/
class ErrorHandlerMiddleware
{
use InstanceConfigTrait;
/**
* Default configuration values.
*
* - `log` Enable logging of exceptions.
* - `skipLog` List of exceptions to skip logging. Exceptions that
* extend one of the listed exceptions will also not be logged. Example:
*
* ```
* 'skipLog' => ['Cake\Error\NotFoundException', 'Cake\Error\UnauthorizedException']
* ```
*
* - `trace` Should error logs include stack traces?
*
* @var array
*/
protected $_defaultConfig = [
'skipLog' => [],
'log' => true,
'trace' => false,
];
/**
* Exception render.
*
* @var \Cake\Error\ExceptionRendererInterface|callable|string|null
*/
protected $exceptionRenderer;
/**
* Constructor
*
* @param string|callable|null $exceptionRenderer The renderer or class name
* to use or a callable factory. If null, Configure::read('Error.exceptionRenderer')
* will be used.
* @param array $config Configuration options to use. If empty, `Configure::read('Error')`
* will be used.
*/
public function __construct($exceptionRenderer = null, array $config = [])
{
if ($exceptionRenderer) {
$this->exceptionRenderer = $exceptionRenderer;
}
$config = $config ?: Configure::read('Error');
$this->setConfig($config);
}
/**
* Wrap the remaining middleware with error handling.
*
* @param \Psr\Http\Message\ServerRequestInterface $request The request.
* @param \Psr\Http\Message\ResponseInterface $response The response.
* @param callable $next Callback to invoke the next middleware.
* @return \Psr\Http\Message\ResponseInterface A response
*/
public function __invoke($request, $response, $next)
{
try {
return $next($request, $response);
} catch (Throwable $exception) {
return $this->handleException($exception, $request, $response);
} catch (Exception $exception) {
return $this->handleException($exception, $request, $response);
}
}
/**
* Handle an exception and generate an error response
*
* @param \Exception $exception The exception to handle.
* @param \Psr\Http\Message\ServerRequestInterface $request The request.
* @param \Psr\Http\Message\ResponseInterface $response The response.
* @return \Psr\Http\Message\ResponseInterface A response
*/
public function handleException($exception, $request, $response)
{
$renderer = $this->getRenderer($exception);
try {
$res = $renderer->render();
$this->logException($request, $exception);
return $res;
} catch (Throwable $exception) {
$this->logException($request, $exception);
$response = $this->handleInternalError($response);
} catch (Exception $exception) {
$this->logException($request, $exception);
$response = $this->handleInternalError($response);
}
return $response;
}
/**
* @param \Psr\Http\Message\ResponseInterface $response The response
*
* @return \Psr\Http\Message\ResponseInterface A response
*/
protected function handleInternalError($response)
{
$body = $response->getBody();
$body->write('An Internal Server Error Occurred');
return $response->withStatus(500)
->withBody($body);
}
/**
* Get a renderer instance
*
* @param \Exception $exception The exception being rendered.
* @return \Cake\Error\ExceptionRendererInterface The exception renderer.
* @throws \Exception When the renderer class cannot be found.
*/
protected function getRenderer($exception)
{
if (!$this->exceptionRenderer) {
$this->exceptionRenderer = $this->getConfig('exceptionRenderer') ?: ExceptionRenderer::class;
}
// For PHP5 backwards compatibility
if ($exception instanceof Error) {
$exception = new PHP7ErrorException($exception);
}
if (is_string($this->exceptionRenderer)) {
$class = App::className($this->exceptionRenderer, 'Error');
if (!$class) {
throw new Exception(sprintf(
"The '%s' renderer class could not be found.",
$this->exceptionRenderer
));
}
return new $class($exception);
}
$factory = $this->exceptionRenderer;
return $factory($exception);
}
/**
* Log an error for the exception if applicable.
*
* @param \Psr\Http\Message\ServerRequestInterface $request The current request.
* @param \Exception $exception The exception to log a message for.
* @return void
*/
protected function logException($request, $exception)
{
if (!$this->getConfig('log')) {
return;
}
foreach ((array)$this->getConfig('skipLog') as $class) {
if ($exception instanceof $class) {
return;
}
}
Log::error($this->getMessage($request, $exception));
}
/**
* Generate the error log message.
*
* @param \Psr\Http\Message\ServerRequestInterface $request The current request.
* @param \Exception $exception The exception to log a message for.
* @return string Error message
*/
protected function getMessage($request, $exception)
{
$message = sprintf(
'[%s] %s',
get_class($exception),
$exception->getMessage()
);
$debug = Configure::read('debug');
if ($debug && $exception instanceof CakeException) {
$attributes = $exception->getAttributes();
if ($attributes) {
$message .= "\nException Attributes: " . var_export($exception->getAttributes(), true);
}
}
$message .= "\nRequest URL: " . $request->getRequestTarget();
$referer = $request->getHeaderLine('Referer');
if ($referer) {
$message .= "\nReferer URL: " . $referer;
}
if ($this->getConfig('trace')) {
$message .= "\nStack Trace:\n" . $exception->getTraceAsString() . "\n\n";
}
return $message;
}
}