phabricator/src/applications/search/controller/PhabricatorApplicationSearchController.php

<?php

final class PhabricatorApplicationSearchController
  extends PhabricatorSearchBaseController {

  private $searchEngine;
  private $navigation;
  private $queryKey;
  private $preface;
  private $activeQuery;

  public function setPreface($preface) {
    $this->preface = $preface;
    return $this;
  }

  public function getPreface() {
    return $this->preface;
  }

  public function setQueryKey($query_key) {
    $this->queryKey = $query_key;
    return $this;
  }

  protected function getQueryKey() {
    return $this->queryKey;
  }

  public function setNavigation(AphrontSideNavFilterView $navigation) {
    $this->navigation = $navigation;
    return $this;
  }

  protected function getNavigation() {
    return $this->navigation;
  }

  public function setSearchEngine(
    PhabricatorApplicationSearchEngine $search_engine) {
    $this->searchEngine = $search_engine;
    return $this;
  }

  protected function getSearchEngine() {
    return $this->searchEngine;
  }

  protected function getActiveQuery() {
    if (!$this->activeQuery) {
      throw new Exception(pht('There is no active query yet.'));
    }

    return $this->activeQuery;
  }

  protected function validateDelegatingController() {
    $parent = $this->getDelegatingController();

    if (!$parent) {
      throw new Exception(
        pht('You must delegate to this controller, not invoke it directly.'));
    }

    $engine = $this->getSearchEngine();
    if (!$engine) {
      throw new PhutilInvalidStateException('setEngine');
    }

    $engine->setViewer($this->getRequest()->getUser());

    $parent = $this->getDelegatingController();
  }

  public function processRequest() {
    $this->validateDelegatingController();

    $query_action = $this->getRequest()->getURIData('queryAction');
    if ($query_action == 'export') {
      return $this->processExportRequest();
    }

    $key = $this->getQueryKey();
    if ($key == 'edit') {
      return $this->processEditRequest();
    } else {
      return $this->processSearchRequest();
    }
  }

  private function processSearchRequest() {
    $parent = $this->getDelegatingController();
    $request = $this->getRequest();
    $user = $request->getUser();
    $engine = $this->getSearchEngine();
    $nav = $this->getNavigation();
    if (!$nav) {
      $nav = $this->buildNavigation();
    }

    if ($request->isFormPost()) {
      $saved_query = $engine->buildSavedQueryFromRequest($request);
      $engine->saveQuery($saved_query);
      return id(new AphrontRedirectResponse())->setURI(
        $engine->getQueryResultsPageURI($saved_query->getQueryKey()).'#R');
    }

    $named_query = null;
    $run_query = true;
    $query_key = $this->queryKey;
    if ($this->queryKey == 'advanced') {
      $run_query = false;
      $query_key = $request->getStr('query');
    } else if (!strlen($this->queryKey)) {
      $found_query_data = false;

      if ($request->isHTTPGet() || $request->isQuicksand()) {
        // If this is a GET request and it has some query data, don't
        // do anything unless it's only before= or after=. We'll build and
        // execute a query from it below. This allows external tools to build
        // URIs like "/query/?users=a,b".
        $pt_data = $request->getPassthroughRequestData();

        $exempt = array(
          'before' => true,
          'after' => true,
          'nux' => true,
          'overheated' => true,
        );

        foreach ($pt_data as $pt_key => $pt_value) {
          if (isset($exempt[$pt_key])) {
            continue;
          }

          $found_query_data = true;
          break;
        }
      }

      if (!$found_query_data) {
        // Otherwise, there's no query data so just run the user's default
        // query for this application.
        $query_key = $engine->getDefaultQueryKey();
      }
    }

    if ($engine->isBuiltinQuery($query_key)) {
      $saved_query = $engine->buildSavedQueryFromBuiltin($query_key);
      $named_query = idx($engine->loadEnabledNamedQueries(), $query_key);
    } else if ($query_key) {
      $saved_query = id(new PhabricatorSavedQueryQuery())
        ->setViewer($user)
        ->withQueryKeys(array($query_key))
        ->executeOne();

      if (!$saved_query) {
        return new Aphront404Response();
      }

      $named_query = idx($engine->loadEnabledNamedQueries(), $query_key);
    } else {
      $saved_query = $engine->buildSavedQueryFromRequest($request);

      // Save the query to generate a query key, so "Save Custom Query..." and
      // other features like "Bulk Edit" and "Export Data" work correctly.
      $engine->saveQuery($saved_query);
    }

    $this->activeQuery = $saved_query;

    $nav->selectFilter(
      'query/'.$saved_query->getQueryKey(),
      'query/advanced');

    $form = id(new AphrontFormView())
      ->setUser($user)
      ->setAction($request->getPath());

    $engine->buildSearchForm($form, $saved_query);

    $errors = $engine->getErrors();
    if ($errors) {
      $run_query = false;
    }

    $submit = id(new AphrontFormSubmitControl())
      ->setValue(pht('Search'));

    if ($run_query && !$named_query && $user->isLoggedIn()) {
      $save_button = id(new PHUIButtonView())
        ->setTag('a')
        ->setHref('/search/edit/key/'.$saved_query->getQueryKey().'/')
        ->setText(pht('Save Query'))
        ->setIcon('fa-floppy-o');
      $submit->addButton($save_button);
    }

    // TODO: A "Create Dashboard Panel" action goes here somewhere once
    // we sort out T5307.

    $form->appendChild($submit);
    $body = array();

    if ($this->getPreface()) {
      $body[] = $this->getPreface();
    }

    if ($named_query) {
      $title = $named_query->getQueryName();
    } else {
      $title = pht('Advanced Search');
    }

    $header = id(new PHUIHeaderView())
      ->setHeader($title)
      ->setProfileHeader(true);

    $box = id(new PHUIObjectBoxView())
      ->setHeader($header)
      ->addClass('application-search-results');

    if ($run_query || $named_query) {
      $box->setShowHide(
        pht('Edit Query'),
        pht('Hide Query'),
        $form,
        $this->getApplicationURI('query/advanced/?query='.$query_key),
        (!$named_query ? true : false));
    } else {
      $box->setForm($form);
    }

    $body[] = $box;
    $more_crumbs = null;

    if ($run_query) {
      $exec_errors = array();

      $box->setAnchor(
        id(new PhabricatorAnchorView())
          ->setAnchorName('R'));

      try {
        $engine->setRequest($request);

        $query = $engine->buildQueryFromSavedQuery($saved_query);

        $pager = $engine->newPagerForSavedQuery($saved_query);
        $pager->readFromRequest($request);

        $query->setReturnPartialResultsOnOverheat(true);

        $objects = $engine->executeQuery($query, $pager);

        $force_nux = $request->getBool('nux');
        if (!$objects || $force_nux) {
          $nux_view = $this->renderNewUserView($engine, $force_nux);
        } else {
          $nux_view = null;
        }

        $is_overflowing =
          $pager->willShowPagingControls() &&
          $engine->getResultBucket($saved_query);

        $force_overheated = $request->getBool('overheated');
        $is_overheated = $query->getIsOverheated() || $force_overheated;

        if ($nux_view) {
          $box->appendChild($nux_view);
        } else {
          $list = $engine->renderResults($objects, $saved_query);

          if (!($list instanceof PhabricatorApplicationSearchResultView)) {
            throw new Exception(
              pht(
                'SearchEngines must render a "%s" object, but this engine '.
                '(of class "%s") rendered something else ("%s").',
                'PhabricatorApplicationSearchResultView',
                get_class($engine),
                phutil_describe_type($list)));
          }

          if ($list->getObjectList()) {
            $box->setObjectList($list->getObjectList());
          }
          if ($list->getTable()) {
            $box->setTable($list->getTable());
          }
          if ($list->getInfoView()) {
            $box->setInfoView($list->getInfoView());
          }

          if ($is_overflowing) {
            $box->appendChild($this->newOverflowingView());
          }

          if ($list->getContent()) {
            $box->appendChild($list->getContent());
          }

          if ($is_overheated) {
            $box->appendChild($this->newOverheatedView($objects));
          }

          $result_header = $list->getHeader();
          if ($result_header) {
            $box->setHeader($result_header);
            $header = $result_header;
          }

          $actions = $list->getActions();
          if ($actions) {
            foreach ($actions as $action) {
              $header->addActionLink($action);
            }
          }

          $use_actions = $engine->newUseResultsActions($saved_query);

          // TODO: Eventually, modularize all this stuff.
          $builtin_use_actions = $this->newBuiltinUseActions();
          if ($builtin_use_actions) {
            foreach ($builtin_use_actions as $builtin_use_action) {
              $use_actions[] = $builtin_use_action;
            }
          }

          if ($use_actions) {
            $use_dropdown = $this->newUseResultsDropdown(
              $saved_query,
              $use_actions);
            $header->addActionLink($use_dropdown);
          }

          $more_crumbs = $list->getCrumbs();

          if ($pager->willShowPagingControls()) {
            $pager_box = id(new PHUIBoxView())
              ->setColor(PHUIBoxView::GREY)
              ->addClass('application-search-pager')
              ->appendChild($pager);
            $body[] = $pager_box;
          }
        }
      } catch (PhabricatorTypeaheadInvalidTokenException $ex) {
        $exec_errors[] = pht(
          'This query specifies an invalid parameter. Review the '.
          'query parameters and correct errors.');
      } catch (PhutilSearchQueryCompilerSyntaxException $ex) {
        $exec_errors[] = $ex->getMessage();
      } catch (PhabricatorSearchConstraintException $ex) {
        $exec_errors[] = $ex->getMessage();
      } catch (PhabricatorInvalidQueryCursorException $ex) {
        $exec_errors[] = $ex->getMessage();
      }

      // The engine may have encountered additional errors during rendering;
      // merge them in and show everything.
      foreach ($engine->getErrors() as $error) {
        $exec_errors[] = $error;
      }

      $errors = $exec_errors;
    }

    if ($errors) {
      $box->setFormErrors($errors, pht('Query Errors'));
    }

    $crumbs = $parent
      ->buildApplicationCrumbs()
      ->setBorder(true);

    if ($more_crumbs) {
      $query_uri = $engine->getQueryResultsPageURI($saved_query->getQueryKey());
      $crumbs->addTextCrumb($title, $query_uri);

      foreach ($more_crumbs as $crumb) {
        $crumbs->addCrumb($crumb);
      }
    } else {
      $crumbs->addTextCrumb($title);
    }

    require_celerity_resource('application-search-view-css');

    return $this->newPage()
      ->setApplicationMenu($this->buildApplicationMenu())
      ->setTitle(pht('Query: %s', $title))
      ->setCrumbs($crumbs)
      ->setNavigation($nav)
      ->addClass('application-search-view')
      ->appendChild($body);
  }

  private function processExportRequest() {
    $viewer = $this->getViewer();
    $engine = $this->getSearchEngine();
    $request = $this->getRequest();

    if (!$this->canExport()) {
      return new Aphront404Response();
    }

    $query_key = $this->getQueryKey();
    if ($engine->isBuiltinQuery($query_key)) {
      $saved_query = $engine->buildSavedQueryFromBuiltin($query_key);
    } else if ($query_key) {
      $saved_query = id(new PhabricatorSavedQueryQuery())
        ->setViewer($viewer)
        ->withQueryKeys(array($query_key))
        ->executeOne();
    } else {
      $saved_query = null;
    }

    if (!$saved_query) {
      return new Aphront404Response();
    }

    $cancel_uri = $engine->getQueryResultsPageURI($query_key);

    $named_query = idx($engine->loadEnabledNamedQueries(), $query_key);

    if ($named_query) {
      $filename = $named_query->getQueryName();
      $sheet_title = $named_query->getQueryName();
    } else {
      $filename = $engine->getResultTypeDescription();
      $sheet_title = $engine->getResultTypeDescription();
    }
    $filename = phutil_utf8_strtolower($filename);
    $filename = PhabricatorFile::normalizeFileName($filename);

    $all_formats = PhabricatorExportFormat::getAllExportFormats();

    $available_options = array();
    $unavailable_options = array();
    $formats = array();
    $unavailable_formats = array();
    foreach ($all_formats as $key => $format) {
      if ($format->isExportFormatEnabled()) {
        $available_options[$key] = $format->getExportFormatName();
        $formats[$key] = $format;
      } else {
        $unavailable_options[$key] = pht(
          '%s (Not Available)',
          $format->getExportFormatName());
        $unavailable_formats[$key] = $format;
      }
    }
    $format_options = $available_options + $unavailable_options;

    // Try to default to the format the user used last time. If you just
    // exported to Excel, you probably want to export to Excel again.
    $format_key = $this->readExportFormatPreference();
    if (!isset($formats[$format_key])) {
      $format_key = head_key($format_options);
    }

    // Check if this is a large result set or not. If we're exporting a
    // large amount of data, we'll build the actual export file in the daemons.

    $threshold = 1000;
    $query = $engine->buildQueryFromSavedQuery($saved_query);
    $pager = $engine->newPagerForSavedQuery($saved_query);
    $pager->setPageSize($threshold + 1);
    $objects = $engine->executeQuery($query, $pager);
    $object_count = count($objects);
    $is_large_export = ($object_count > $threshold);

    $errors = array();

    $e_format = null;
    if ($request->isFormPost()) {
      $format_key = $request->getStr('format');

      if (isset($unavailable_formats[$format_key])) {
        $unavailable = $unavailable_formats[$format_key];
        $instructions = $unavailable->getInstallInstructions();

        $markup = id(new PHUIRemarkupView($viewer, $instructions))
          ->setRemarkupOption(
            PHUIRemarkupView::OPTION_PRESERVE_LINEBREAKS,
            false);

        return $this->newDialog()
          ->setTitle(pht('Export Format Not Available'))
          ->appendChild($markup)
          ->addCancelButton($cancel_uri, pht('Done'));
      }

      $format = idx($formats, $format_key);

      if (!$format) {
        $e_format = pht('Invalid');
        $errors[] = pht('Choose a valid export format.');
      }

      if (!$errors) {
        $this->writeExportFormatPreference($format_key);

        $export_engine = id(new PhabricatorExportEngine())
          ->setViewer($viewer)
          ->setSearchEngine($engine)
          ->setSavedQuery($saved_query)
          ->setTitle($sheet_title)
          ->setFilename($filename)
          ->setExportFormat($format);

        if ($is_large_export) {
          $job = $export_engine->newBulkJob($request);

          return id(new AphrontRedirectResponse())
            ->setURI($job->getMonitorURI());
        } else {
          $file = $export_engine->exportFile();
          return $file->newDownloadResponse();
        }
      }
    }

    $export_form = id(new AphrontFormView())
      ->setViewer($viewer)
      ->appendControl(
        id(new AphrontFormSelectControl())
          ->setName('format')
          ->setLabel(pht('Format'))
          ->setError($e_format)
          ->setValue($format_key)
          ->setOptions($format_options));

    if ($is_large_export) {
      $submit_button = pht('Continue');
    } else {
      $submit_button = pht('Download Data');
    }

    return $this->newDialog()
      ->setTitle(pht('Export Results'))
      ->setErrors($errors)
      ->appendForm($export_form)
      ->addCancelButton($cancel_uri)
      ->addSubmitButton($submit_button);
  }

  private function processEditRequest() {
    $parent = $this->getDelegatingController();
    $request = $this->getRequest();
    $viewer = $request->getUser();
    $engine = $this->getSearchEngine();

    $nav = $this->getNavigation();
    if (!$nav) {
      $nav = $this->buildNavigation();
    }

    $named_queries = $engine->loadAllNamedQueries();

    $can_global = $viewer->getIsAdmin();

    $groups = array(
      'personal' => array(
        'name' => pht('Personal Saved Queries'),
        'items' => array(),
        'edit' => true,
      ),
      'global' => array(
        'name' => pht('Global Saved Queries'),
        'items' => array(),
        'edit' => $can_global,
      ),
    );

    foreach ($named_queries as $named_query) {
      if ($named_query->isGlobal()) {
        $group = 'global';
      } else {
        $group = 'personal';
      }

      $groups[$group]['items'][] = $named_query;
    }

    $default_key = $engine->getDefaultQueryKey();

    $lists = array();
    foreach ($groups as $group) {
      $lists[] = $this->newQueryListView(
        $group['name'],
        $group['items'],
        $default_key,
        $group['edit']);
    }

    $crumbs = $parent
      ->buildApplicationCrumbs()
      ->addTextCrumb(pht('Saved Queries'), $engine->getQueryManagementURI())
      ->setBorder(true);

    $nav->selectFilter('query/edit');

    $header = id(new PHUIHeaderView())
      ->setHeader(pht('Saved Queries'))
      ->setProfileHeader(true);

    $view = id(new PHUITwoColumnView())
      ->setHeader($header)
      ->setFooter($lists);

    return $this->newPage()
      ->setApplicationMenu($this->buildApplicationMenu())
      ->setTitle(pht('Saved Queries'))
      ->setCrumbs($crumbs)
      ->setNavigation($nav)
      ->appendChild($view);
  }

  private function newQueryListView(
    $list_name,
    array $named_queries,
    $default_key,
    $can_edit) {

    $engine = $this->getSearchEngine();
    $viewer = $this->getViewer();

    $list = id(new PHUIObjectItemListView())
      ->setViewer($viewer);

    if ($can_edit) {
      $list_id = celerity_generate_unique_node_id();
      $list->setID($list_id);

      Javelin::initBehavior(
        'search-reorder-queries',
        array(
          'listID' => $list_id,
          'orderURI' => '/search/order/'.get_class($engine).'/',
        ));
    }

    foreach ($named_queries as $named_query) {
      $class = get_class($engine);
      $key = $named_query->getQueryKey();

      $item = id(new PHUIObjectItemView())
        ->setHeader($named_query->getQueryName())
        ->setHref($engine->getQueryResultsPageURI($key));

      if ($named_query->getIsDisabled()) {
        if ($can_edit) {
          $item->setDisabled(true);
        } else {
          // If an item is disabled and you don't have permission to edit it,
          // just skip it.
          continue;
        }
      }

      if ($can_edit) {
        if ($named_query->getIsBuiltin() && $named_query->getIsDisabled()) {
          $icon = 'fa-plus';
          $disable_name = pht('Enable');
        } else {
          $icon = 'fa-times';
          if ($named_query->getIsBuiltin()) {
            $disable_name = pht('Disable');
          } else {
            $disable_name = pht('Delete');
          }
        }

        if ($named_query->getID()) {
          $disable_href = '/search/delete/id/'.$named_query->getID().'/';
        } else {
          $disable_href = '/search/delete/key/'.$key.'/'.$class.'/';
        }

        $item->addAction(
          id(new PHUIListItemView())
            ->setIcon($icon)
            ->setHref($disable_href)
            ->setRenderNameAsTooltip(true)
            ->setName($disable_name)
            ->setWorkflow(true));
      }

      $default_disabled = $named_query->getIsDisabled();
      $default_icon = 'fa-thumb-tack';

      if ($default_key === $key) {
        $default_color = 'green';
      } else {
        $default_color = null;
      }

      $item->addAction(
        id(new PHUIListItemView())
          ->setIcon("{$default_icon} {$default_color}")
          ->setHref('/search/default/'.$key.'/'.$class.'/')
          ->setRenderNameAsTooltip(true)
          ->setName(pht('Make Default'))
          ->setWorkflow(true)
          ->setDisabled($default_disabled));

      if ($can_edit) {
        if ($named_query->getIsBuiltin()) {
          $edit_icon = 'fa-lock lightgreytext';
          $edit_disabled = true;
          $edit_name = pht('Builtin');
          $edit_href = null;
        } else {
          $edit_icon = 'fa-pencil';
          $edit_disabled = false;
          $edit_name = pht('Edit');
          $edit_href = '/search/edit/id/'.$named_query->getID().'/';
        }

        $item->addAction(
          id(new PHUIListItemView())
            ->setIcon($edit_icon)
            ->setHref($edit_href)
            ->setRenderNameAsTooltip(true)
            ->setName($edit_name)
            ->setDisabled($edit_disabled));
      }

      $item->setGrippable($can_edit);
      $item->addSigil('named-query');
      $item->setMetadata(
        array(
          'queryKey' => $named_query->getQueryKey(),
        ));

      $list->addItem($item);
    }

    $list->setNoDataString(pht('No saved queries.'));

    return id(new PHUIObjectBoxView())
      ->setHeaderText($list_name)
      ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
      ->setObjectList($list);
  }

  public function buildApplicationMenu() {
    $menu = $this->getDelegatingController()
      ->buildApplicationMenu();

    if ($menu instanceof PHUIApplicationMenuView) {
      $menu->setSearchEngine($this->getSearchEngine());
    }

    return $menu;
  }

  private function buildNavigation() {
    $viewer = $this->getViewer();
    $engine = $this->getSearchEngine();

    $nav = id(new AphrontSideNavFilterView())
      ->setUser($viewer)
      ->setBaseURI(new PhutilURI($this->getApplicationURI()));

    $engine->addNavigationItems($nav->getMenu());

    return $nav;
  }

  private function renderNewUserView(
    PhabricatorApplicationSearchEngine $engine,
    $force_nux) {

    // Don't render NUX if the user has clicked away from the default page.
    if (strlen($this->getQueryKey())) {
      return null;
    }

    // Don't put NUX in panels because it would be weird.
    if ($engine->isPanelContext()) {
      return null;
    }

    // Try to render the view itself first, since this should be very cheap
    // (just returning some text).
    $nux_view = $engine->renderNewUserView();

    if (!$nux_view) {
      return null;
    }

    $query = $engine->newQuery();
    if (!$query) {
      return null;
    }

    // Try to load any object at all. If we can, the application has seen some
    // use so we just render the normal view.
    if (!$force_nux) {
      $object = $query
        ->setViewer(PhabricatorUser::getOmnipotentUser())
        ->setLimit(1)
        ->setReturnPartialResultsOnOverheat(true)
        ->execute();
      if ($object) {
        return null;
      }
    }

    return $nux_view;
  }

  private function newUseResultsDropdown(
    PhabricatorSavedQuery $query,
    array $dropdown_items) {

    $viewer = $this->getViewer();

    $action_list = id(new PhabricatorActionListView())
      ->setViewer($viewer);
    foreach ($dropdown_items as $dropdown_item) {
      $action_list->addAction($dropdown_item);
    }

    return id(new PHUIButtonView())
      ->setTag('a')
      ->setHref('#')
      ->setText(pht('Use Results'))
      ->setIcon('fa-bars')
      ->setDropdownMenu($action_list)
      ->addClass('dropdown');
  }

  private function newOverflowingView() {
    $message = pht(
      'The query matched more than one page of results. Results are '.
      'paginated before bucketing, so later pages may contain additional '.
      'results in any bucket.');

    return id(new PHUIInfoView())
      ->setSeverity(PHUIInfoView::SEVERITY_WARNING)
      ->setFlush(true)
      ->setTitle(pht('Buckets Overflowing'))
      ->setErrors(
        array(
          $message,
        ));
  }

  private function newOverheatedView(array $results) {
    if ($results) {
      $message = pht(
        'Most objects matching your query are not visible to you, so '.
        'filtering results is taking a long time. Only some results are '.
        'shown. Refine your query to find results more quickly.');
    } else {
      $message = pht(
        'Most objects matching your query are not visible to you, so '.
        'filtering results is taking a long time. Refine your query to '.
        'find results more quickly.');
    }

    return id(new PHUIInfoView())
      ->setSeverity(PHUIInfoView::SEVERITY_WARNING)
      ->setFlush(true)
      ->setTitle(pht('Query Overheated'))
      ->setErrors(
        array(
          $message,
        ));
  }

  private function newBuiltinUseActions() {
    $actions = array();
    $request = $this->getRequest();
    $viewer = $request->getUser();

    $is_dev = PhabricatorEnv::getEnvConfig('phabricator.developer-mode');

    $engine = $this->getSearchEngine();
    $engine_class = get_class($engine);

    $query_key = $this->getActiveQuery()->getQueryKey();

    $can_use = $engine->canUseInPanelContext();
    $is_installed = PhabricatorApplication::isClassInstalledForViewer(
      'PhabricatorDashboardApplication',
      $viewer);

    if ($can_use && $is_installed) {
      $actions[] = id(new PhabricatorActionView())
        ->setIcon('fa-dashboard')
        ->setName(pht('Add to Dashboard'))
        ->setWorkflow(true)
        ->setHref("/dashboard/panel/install/{$engine_class}/{$query_key}/");
    }

    if ($this->canExport()) {
      $export_uri = $engine->getExportURI($query_key);
      $actions[] = id(new PhabricatorActionView())
        ->setIcon('fa-download')
        ->setName(pht('Export Data'))
        ->setWorkflow(true)
        ->setHref($export_uri);
    }

    if ($is_dev) {
      $engine = $this->getSearchEngine();
      $nux_uri = $engine->getQueryBaseURI();
      $nux_uri = id(new PhutilURI($nux_uri))
        ->replaceQueryParam('nux', true);

      $actions[] = id(new PhabricatorActionView())
        ->setIcon('fa-user-plus')
        ->setName(pht('DEV: New User State'))
        ->setHref($nux_uri);
    }

    if ($is_dev) {
      $overheated_uri = $this->getRequest()->getRequestURI()
        ->replaceQueryParam('overheated', true);

      $actions[] = id(new PhabricatorActionView())
        ->setIcon('fa-fire')
        ->setName(pht('DEV: Overheated State'))
        ->setHref($overheated_uri);
    }

    return $actions;
  }

  private function canExport() {
    $engine = $this->getSearchEngine();
    if (!$engine->canExport()) {
      return false;
    }

    // Don't allow logged-out users to perform exports. There's no technical
    // or policy reason they can't, but we don't normally give them access
    // to write files or jobs. For now, just err on the side of caution.

    $viewer = $this->getViewer();
    if (!$viewer->getPHID()) {
      return false;
    }

    return true;
  }

  private function readExportFormatPreference() {
    $viewer = $this->getViewer();
    $export_key = PhabricatorPolicyFavoritesSetting::SETTINGKEY;
    return $viewer->getUserSetting($export_key);
  }

  private function writeExportFormatPreference($value) {
    $viewer = $this->getViewer();
    $request = $this->getRequest();

    if (!$viewer->isLoggedIn()) {
      return;
    }

    $export_key = PhabricatorPolicyFavoritesSetting::SETTINGKEY;
    $preferences = PhabricatorUserPreferences::loadUserPreferences($viewer);

    $editor = id(new PhabricatorUserPreferencesEditor())
      ->setActor($viewer)
      ->setContentSourceFromRequest($request)
      ->setContinueOnNoEffect(true)
      ->setContinueOnMissingFields(true);

    $xactions = array();
    $xactions[] = $preferences->newTransaction($export_key, $value);
    $editor->applyTransactions($preferences, $xactions);
  }

}