private function buildCurtain(PhabricatorCalendarImport $import)
 {
     $viewer = $this->getViewer();
     $id = $import->getID();
     $curtain = $this->newCurtainView($import);
     $engine = $import->getEngine();
     $can_edit = PhabricatorPolicyFilter::hasCapability($viewer, $import, PhabricatorPolicyCapability::CAN_EDIT);
     $edit_uri = "import/edit/{$id}/";
     $edit_uri = $this->getApplicationURI($edit_uri);
     $can_disable = $can_edit && $engine->canDisable($viewer, $import);
     $curtain->addAction(id(new PhabricatorActionView())->setName(pht('Edit Import'))->setIcon('fa-pencil')->setDisabled(!$can_edit)->setWorkflow(!$can_edit)->setHref($edit_uri));
     $reload_uri = "import/reload/{$id}/";
     $reload_uri = $this->getApplicationURI($reload_uri);
     $curtain->addAction(id(new PhabricatorActionView())->setName(pht('Reload Import'))->setIcon('fa-refresh')->setDisabled(!$can_edit)->setWorkflow(true)->setHref($reload_uri));
     $disable_uri = "import/disable/{$id}/";
     $disable_uri = $this->getApplicationURI($disable_uri);
     if ($import->getIsDisabled()) {
         $disable_name = pht('Enable Import');
         $disable_icon = 'fa-check';
     } else {
         $disable_name = pht('Disable Import');
         $disable_icon = 'fa-ban';
     }
     $curtain->addAction(id(new PhabricatorActionView())->setName($disable_name)->setIcon($disable_icon)->setDisabled(!$can_disable)->setWorkflow(true)->setHref($disable_uri));
     if ($can_edit) {
         $can_delete = $engine->canDeleteAnyEvents($viewer, $import);
     } else {
         $can_delete = false;
     }
     $delete_uri = "import/delete/{$id}/";
     $delete_uri = $this->getApplicationURI($delete_uri);
     $curtain->addAction(id(new PhabricatorActionView())->setName(pht('Delete Imported Events'))->setIcon('fa-times')->setDisabled(!$can_delete)->setWorkflow(true)->setHref($delete_uri));
     return $curtain;
 }