class Quickbooks::Service::Upload

def class_for_io
  oauth.is_a?(OAuth2::AccessToken) ? Faraday::UploadIO : UploadIO
end

def download(uploadId)
  url = url_for_resource("download/#{uploadId}")
  do_http_get(url, {}, headers)
end

def model
  Quickbooks::Model::Attachable
end

def upload(path_to_file, mime_type, attachable = nil)
  url = url_for_resource("upload")
  uploadIO = class_for_io.new(path_to_file, mime_type)
  response = do_http_file_upload(uploadIO, url, attachable)
  prefix = "AttachableResponse/xmlns:Attachable"
  if response.code.to_i == 200
    model.from_xml(parse_singular_entity_response(model, response.plain_body, prefix))
  else
    nil
  end
end