<?php

final class PhabricatorDefaultRequestExceptionHandler
  extends PhabricatorRequestExceptionHandler {

  public function getRequestExceptionHandlerPriority() {
    return 900000;
  }

  public function getRequestExceptionHandlerDescription() {
    return pht('Handles all other exceptions.');
  }

  public function canHandleRequestThrowable(
    AphrontRequest $request,
    $throwable) {

    if (!$this->isPhabricatorSite($request)) {
      return false;
    }

    return true;
  }

  public function handleRequestThrowable(
    AphrontRequest $request,
    $throwable) {

    $viewer = $this->getViewer($request);

    // Some types of uninteresting request exceptions don't get logged, usually
    // because they are caused by the background radiation of bot traffic on
    // the internet. These include requests with bad CSRF tokens and
    // questionable "Host" headers.
    $should_log = true;
    if ($throwable instanceof AphrontMalformedRequestException) {
      $should_log = !$throwable->getIsUnlogged();
    }

    if ($should_log) {
      phlog($throwable);
    }

    $class = get_class($throwable);

    if (PhabricatorEnv::getEnvConfig('phabricator.developer-mode')) {
      // Include last location in error message
      $message = '"'.$throwable->getMessage().'" at '.
        PhutilErrorHandler::adjustFilePath($throwable->getFile()).
        ':'.$throwable->getLine();
    } else {
      $message = $throwable->getMessage();
    }

    if ($throwable instanceof AphrontSchemaQueryException) {
      $message .= "\n\n".pht(
        "NOTE: This usually indicates that the MySQL schema has not been ".
        "properly upgraded. Run '%s' to ensure your schema is up to date.",
        'bin/storage upgrade');
    }

    if (PhabricatorEnv::getEnvConfig('phabricator.developer-mode')) {
      $trace = id(new AphrontStackTraceView())
        ->setViewer($viewer)
        ->setTrace($throwable->getTrace());
    } else {
      $trace = null;
    }

    $content = phutil_tag(
      'div',
      array('class' => 'aphront-unhandled-exception'),
      array(
        phutil_tag('div', array('class' => 'exception-message'), $message),
        $trace,
      ));

    $dialog = new AphrontDialogView();
    $dialog
      ->setTitle(pht('Unhandled Exception ("%s")', $class))
      ->setClass('aphront-exception-dialog')
      ->setViewer($viewer)
      ->appendChild($content);

    if ($request->isAjax()) {
      $dialog->addCancelButton('/', pht('Close'));
    }

    return id(new AphrontDialogResponse())
      ->setDialog($dialog)
      ->setHTTPResponseCode(500);
  }

}