protected function DefaultExceptionSubscriber::onHtml in Zircon Profile 8

Same name and namespace in other branches

1. 8.0 core/lib/Drupal/Core/EventSubscriber/DefaultExceptionSubscriber.php \Drupal\Core\EventSubscriber\DefaultExceptionSubscriber::onHtml()

Handles any exception as a generic error page for HTML.

Parameters

\Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event: The event to process.

File

core/lib/Drupal/Core/EventSubscriber/DefaultExceptionSubscriber.php, line 73

Contains \Drupal\Core\EventSubscriber\DefaultExceptionSubscriber.

Class

DefaultExceptionSubscriber

Last-chance handler for exceptions.

Namespace

Drupal\Core\EventSubscriber

Code

protected function onHtml(GetResponseForExceptionEvent $event) {
  $exception = $event
    ->getException();
  $error = Error::decodeException($exception);

  // Display the message if the current error reporting level allows this type
  // of message to be displayed, and unconditionally in update.php.
  $message = '';
  if (error_displayable($error)) {

    // If error type is 'User notice' then treat it as debug information
    // instead of an error message.
    // @see debug()
    if ($error['%type'] == 'User notice') {
      $error['%type'] = 'Debug';
    }

    // Attempt to reduce verbosity by removing DRUPAL_ROOT from the file path
    // in the message. This does not happen for (false) security.
    $root_length = strlen(DRUPAL_ROOT);
    if (substr($error['%file'], 0, $root_length) == DRUPAL_ROOT) {
      $error['%file'] = substr($error['%file'], $root_length + 1);
    }
    unset($error['backtrace']);
    if ($this
      ->getErrorLevel() != ERROR_REPORTING_DISPLAY_VERBOSE) {

      // Without verbose logging, use a simple message.
      // We call SafeMarkup::format directly here, rather than use t() since
      // we are in the middle of error handling, and we don't want t() to
      // cause further errors.
      $message = SafeMarkup::format('%type: @message in %function (line %line of %file).', $error);
    }
    else {

      // With verbose logging, we will also include a backtrace.
      $backtrace_exception = $exception;
      while ($backtrace_exception
        ->getPrevious()) {
        $backtrace_exception = $backtrace_exception
          ->getPrevious();
      }
      $backtrace = $backtrace_exception
        ->getTrace();

      // First trace is the error itself, already contained in the message.
      // While the second trace is the error source and also contained in the
      // message, the message doesn't contain argument values, so we output it
      // once more in the backtrace.
      array_shift($backtrace);

      // Generate a backtrace containing only scalar argument values.
      $error['@backtrace'] = Error::formatBacktrace($backtrace);
      $message = SafeMarkup::format('%type: @message in %function (line %line of %file). <pre class="backtrace">@backtrace</pre>', $error);
    }
  }
  $content = $this
    ->t('The website encountered an unexpected error. Please try again later.');
  $content .= $message ? '</br></br>' . $message : '';
  $response = new Response($content, 500);
  if ($exception instanceof HttpExceptionInterface) {
    $response
      ->setStatusCode($exception
      ->getStatusCode());
    $response->headers
      ->add($exception
      ->getHeaders());
  }
  else {
    $response
      ->setStatusCode(Response::HTTP_INTERNAL_SERVER_ERROR, '500 Service unavailable (with message)');
  }
  $event
    ->setResponse($response);
}