--- /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\Response;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Last-chance handler for exceptions: the final exception subscriber.
+ *
+ * This handler will catch any exceptions not caught elsewhere and report
+ * them as an error page.
+ *
+ * Each format has its own way of handling exceptions:
+ * - html: exception.default_html, exception.custom_page_html and
+ * exception.fast_404_html
+ * - json: exception.default_json
+ *
+ * And when the serialization module is installed, all serialization formats are
+ * handled by a single exception subscriber:: serialization.exception.default.
+ *
+ * This exception subscriber runs after all the above (it has a lower priority),
+ * which makes it the last-chance exception handler. It always sends a plain
+ * text response. If it's a displayable error and the error level is configured
+ * to be verbose, then a helpful backtrace is also printed.
+ */
+class FinalExceptionSubscriber 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 FinalExceptionSubscriber.
+ *
+ * @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 exceptions for this subscriber.
+ *
+ * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+ * The event to process.
+ */
+ public function onException(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.
+ $message = '';
+ if ($this->isErrorDisplayable($error)) {
+ // If error type is 'User notice' then treat it as debug information
+ // instead of an error message.
+ // @see debug()
+ if ($error['%type'] == 'User notice') {
+ $error['%type'] = 'Debug';
+ }
+
+ $error = $this->simplifyFileInError($error);
+
+ unset($error['backtrace']);
+
+ if (!$this->isErrorLevelVerbose()) {
+ // 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, ['Content-Type' => 'text/plain']);
+
+ 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);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function getSubscribedEvents() {
+ // Run as the final (very late) KernelEvents::EXCEPTION subscriber.
+ $events[KernelEvents::EXCEPTION][] = ['onException', -256];
+ return $events;
+ }
+
+ /**
+ * Checks whether the error level is verbose or not.
+ *
+ * @return bool
+ */
+ protected function isErrorLevelVerbose() {
+ return $this->getErrorLevel() === ERROR_REPORTING_DISPLAY_VERBOSE;
+ }
+
+ /**
+ * Wrapper for error_displayable().
+ *
+ * @param $error
+ * Optional error to examine for ERROR_REPORTING_DISPLAY_SOME.
+ *
+ * @return bool
+ *
+ * @see \error_displayable
+ */
+ protected function isErrorDisplayable($error) {
+ return error_displayable($error);
+ }
+
+ /**
+ * Attempts to reduce error verbosity in the error message's file path.
+ *
+ * Attempts to reduce verbosity by removing DRUPAL_ROOT from the file path in
+ * the message. This does not happen for (false) security.
+ *
+ * @param $error
+ * Optional error to examine for ERROR_REPORTING_DISPLAY_SOME.
+ *
+ * @return
+ * The updated $error.
+ */
+ protected function simplifyFileInError($error) {
+ // 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);
+ }
+ return $error;
+ }
+
+}
projects / yaffs-website / blobdiff