htools-8.x-1.x-dev/htools.routing.yml

htools.contact_form.canonical:
  path: '/file-download/{contact_form}/{file}'
  defaults:
    _title: 'Contact'
    _controller: '\Drupal\htools\Controller\ContactController::contactSitePage'
  requirements:
    _entity_access: 'contact_form.view'
  parameters:
    file:
      type: entity:file