Imports cloud.google.com/go/compute/metadata golang.org/x/oauth2 golang.org/x/oauth2/google google.golang.org/api/option google.golang.org/api/option/internaloption google.golang.org/api/transport/http Standard library imports context crypto crypto/ecdsa crypto/elliptic crypto/rsa crypto/sha256 encoding/base64 encoding/json fmt math/big net/http net/url strconv strings sync time