code: def _return_metadata():
      
      app = current_app
      retdict = {"auth": app.config["AUTH"]["type"]}
      for fld in ["name", "repository", "version", "description",
                  "api_version"]:
          retdict[fld] = app.config[fld.upper()]
      return jsonify(retdict)
docs: Return JSON-formatted metadata for route attachment.
      Requires flask.current_app to be set, which means
       `with app.app_context()`