o365-2.0.3/modules/o365_sharepoint_file/o365_sharepoint_file.routing.yml

o365_sharepoint_file.search:
  path: '/search/documents'
  defaults:
    _title: 'Search Files'
    _controller: '\Drupal\o365_sharepoint_file\Controller\O365SharepointController::build'
    _format: json
  requirements:
    _permission: 'access content'