Token:  oauth2Token.Extra("id_token").(string),
					Expiry: int(oauth2Token.Expiry.Sub(time.Now().UTC()).Seconds()),
				}, nil
			}
		}

		sts, err := credentials.NewSTSWebIdentity(stsEndpoint, getWebTokenExpiry)
		if err != nil {
			log.Println(fmt.Errorf("Could not get STS credentials: %s", err))
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}