--- /dev/null
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\Utility\Error;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Last-chance handler for exceptions.
+ *
+ * This handler will catch any exceptions not caught elsewhere and report
+ * them as an error page.
+ */
+class DefaultExceptionSubscriber implements EventSubscriberInterface {
+ use StringTranslationTrait;
+
+ /**
+ * @var string
+ *
+ * One of the error level constants defined in bootstrap.inc.
+ */
+ protected $errorLevel;
+
+ /**
+ * The config factory.
+ *
+ * @var \Drupal\Core\Config\ConfigFactoryInterface
+ */
+ protected $configFactory;
+
+ /**
+ * Constructs a new DefaultExceptionSubscriber.
+ *
+ * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+ * The configuration factory.
+ */
+ public function __construct(ConfigFactoryInterface $config_factory) {
+ $this->configFactory = $config_factory;
+ }
+
+ /**
+ * Gets the configured error level.
+ *
+ * @return string
+ */
+ protected function getErrorLevel() {
+ if (!isset($this->errorLevel)) {
+ $this->errorLevel = $this->configFactory->get('system.logging')->get('error_level');
+ }
+ return $this->errorLevel;
+ }
+
+ /**
+ * Handles any exception as a generic error page for HTML.
+ *
+ * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+ * The event to process.
+ */
+ 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);
+ }
+
+ /**
+ * Handles any exception as a generic error page for JSON.
+ *
+ * @todo This should probably check the error reporting level.
+ *
+ * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+ * The event to process.
+ */
+ protected function onJson(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,
+ $data = NULL;
+ if (error_displayable($error) && $message = $exception->getMessage()) {
+ $data = ['message' => sprintf('A fatal error occurred: %s', $message)];
+ }
+
+ $response = new JsonResponse($data, Response::HTTP_INTERNAL_SERVER_ERROR);
+ if ($exception instanceof HttpExceptionInterface) {
+ $response->setStatusCode($exception->getStatusCode());
+ $response->headers->add($exception->getHeaders());
+ }
+
+ $event->setResponse($response);
+ }
+
+ /**
+ * Handles an HttpExceptionInterface exception for unknown formats.
+ *
+ * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+ * The event to process.
+ */
+ protected function onFormatUnknown(GetResponseForExceptionEvent $event) {
+ /** @var \Symfony\Component\HttpKernel\Exception\HttpExceptionInterface|\Exception $exception */
+ $exception = $event->getException();
+
+ $response = new Response($exception->getMessage(), $exception->getStatusCode(), $exception->getHeaders());
+ $event->setResponse($response);
+ }
+
+ /**
+ * Handles errors for this subscriber.
+ *
+ * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+ * The event to process.
+ */
+ public function onException(GetResponseForExceptionEvent $event) {
+ $format = $this->getFormat($event->getRequest());
+ $exception = $event->getException();
+
+ $method = 'on' . $format;
+ if (!method_exists($this, $method)) {
+ if ($exception instanceof HttpExceptionInterface) {
+ $this->onFormatUnknown($event);
+ $response = $event->getResponse();
+ $response->headers->set('Content-Type', 'text/plain');
+ }
+ else {
+ $this->onHtml($event);
+ }
+ }
+ else {
+ $this->$method($event);
+ }
+ }
+
+ /**
+ * Gets the error-relevant format from the request.
+ *
+ * @param \Symfony\Component\HttpFoundation\Request $request
+ * The request object.
+ *
+ * @return string
+ * The format as which to treat the exception.
+ */
+ protected function getFormat(Request $request) {
+ $format = $request->query->get(MainContentViewSubscriber::WRAPPER_FORMAT, $request->getRequestFormat());
+
+ // These are all JSON errors for our purposes. Any special handling for
+ // them can/should happen in earlier listeners if desired.
+ if (in_array($format, ['drupal_modal', 'drupal_dialog', 'drupal_ajax'])) {
+ $format = 'json';
+ }
+
+ // Make an educated guess that any Accept header type that includes "json"
+ // can probably handle a generic JSON response for errors. As above, for
+ // any format this doesn't catch or that wants custom handling should
+ // register its own exception listener.
+ foreach ($request->getAcceptableContentTypes() as $mime) {
+ if (strpos($mime, 'html') === FALSE && strpos($mime, 'json') !== FALSE) {
+ $format = 'json';
+ }
+ }
+
+ return $format;
+ }
+
+ /**
+ * Registers the methods in this class that should be listeners.
+ *
+ * @return array
+ * An array of event listener definitions.
+ */
+ public static function getSubscribedEvents() {
+ $events[KernelEvents::EXCEPTION][] = ['onException', -256];
+ return $events;
+ }
+
+}
projects / yaffs-website / blobdiff