class Aws::SSOCredentials

def refresh
  cached_token = read_cached_token
  c = @client.get_role_credentials(
    account_id: @sso_account_id,
    role_name: @sso_role_name,
    access_token: cached_token['accessToken']
  ).role_credentials
  @credentials = Credentials.new(
    c.access_key_id,
    c.secret_access_key,
    c.session_token
  )
  @expiration = c.expiration
end