class Doorkeeper::Request::AuthorizationCode

def grant
  raise Errors::MissingRequiredParameter, :code if parameters[:code].blank?
  Doorkeeper.config.access_grant_model.by_token(parameters[:code])
end

def request
  @request ||= OAuth::AuthorizationCodeRequest.new(
    Doorkeeper.config,
    grant,
    client,
    parameters,
  )
end