// ExitFunc is called by Fatal() class functions, by default it calls os.Exit()
var ExitFunc = os.Exit

// Logger interface describes the methods that need to be implemented to satisfy the interface requirements.
type Logger interface {
	json(msg string, args ...interface{})
	quiet(msg string, args ...interface{})
	pretty(msg string, args ...interface{})
}

func consoleLog(console Logger, msg string, args ...interface{}) {

// bucket and false otherwise.
func isMinioMetaBucketName(bucket string) bool {
	return strings.HasPrefix(bucket, minioMetaBucket)
}

// IsValidBucketName verifies that a bucket name is in accordance with
// Amazon's requirements (i.e. DNS naming conventions). It must be 3-63
// characters long, and it must be a sequence of one or more labels
// separated by periods. Each label can contain lowercase ascii

const (
	GlobalMinioDefaultPort = "9000"

	globalMinioDefaultRegion = ""
	// This is a sha256 output of ``arn:aws:iam::minio:user/admin``,
	// this is kept in present form to be compatible with S3 owner ID
	// requirements -
	//
	// ```
	//    The canonical user ID is the Amazon S3–only concept.
	//    It is 64-character obfuscated version of the account ID.
	// ```

	cmd := &cobra.Command{
		Use:   "precheck",
		Short: "Check whether Istio can safely be installed or upgraded",
		Long:  `precheck inspects a Kubernetes cluster for Istio install and upgrade requirements.`,
		Example: `  # Verify that Istio can be installed or upgraded
  istioctl x precheck

  # Check only a single namespace
  istioctl x precheck --namespace default

	// Ref: https://istio.io/latest/docs/ops/deployment/requirements/#pod-requirements
	if pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.RunAsUser != nil {
		if *pod.Spec.SecurityContext.RunAsUser == UserID {
			fmt.Fprintf(writer, "   WARNING: User ID (UID) 1337 is reserved for the sidecar proxy.\n")
		}
	}

	// https://istio.io/docs/setup/kubernetes/additional-setup/requirements/

var alignedBuf []byte

func init() {
	alignedBuf = disk.AlignedBlock(xioutil.DirectioAlignSize)
	_, _ = rand.Read(alignedBuf)
}

// isValidVolname verifies a volname name in accordance with object
// layer requirements.
func isValidVolname(volname string) bool {
	if len(volname) < 3 {
		return false
	}

	if runtime.GOOS == "windows" {
		// Volname shouldn't have reserved characters in Windows.

		}
	case sizeGtPred:
		if f.ObjectSizeGreaterThan < 0 {
			err = errXMLNotWellFormed
		}
	}
	return err
}

// TestTags tests if the object tags satisfy the Filter tags requirement,
// it returns true if there is no tags in the underlying Filter.
func (f Filter) TestTags(userTags string) bool {
	if f.cachedTags == nil {
		cache := make(map[string]string)

			}
		}
		if usersize > maxUserDataSize || size > maxHeaderSize {
			return true
		}
	}
	return false
}

// Limits body and header to specific allowed maximum limits as per S3/MinIO API requirements.
func setRequestLimitMiddleware(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)

	// claim is only considered stable when subject and iss are used together
	// this is to ensure that ParentUser doesn't change and we get to use
	// parentUser as per the requirements for service accounts for OpenID
	// based logins.
	var subFromToken string
	if v, ok := claims[subClaim]; ok {
		subFromToken, _ = v.(string)
	}

	if subFromToken == "" {

						return
					} else if ci.StatusCode == http.StatusNotModified {
						w.WriteHeader(ci.StatusCode)
						return
					}

					// We did not satisfy any requirement from the cache, update the cache.
					// this basically means that we do not have the Data for the object
					// cached yet
					update = true
				})
				if !update {