const (
	transitionWorkers = "transition_workers"
	expirationWorkers = "expiration_workers"
	// EnvILMTransitionWorkers env variable to configure number of transition workers
	EnvILMTransitionWorkers = "MINIO_ILM_TRANSITION_WORKERS"
	// EnvILMExpirationWorkers env variable to configure number of expiration workers
	EnvILMExpirationWorkers = "MINIO_ILM_EXPIRATION_WORKERS"
)

var (

	// check for omitted fields
	zb0001Len := uint32(1)
	var zb0001Mask uint8 /* 1 bits */
	_ = zb0001Mask
	if z.ObjectV2 == nil {
		zb0001Len--
		zb0001Mask |= 0x1
	}
	// variable map header, size zb0001Len
	err = en.Append(0x80 | uint8(zb0001Len))
	if err != nil {
		return
	}
	if zb0001Len == 0 {
		return
	}
	if (zb0001Mask & 0x1) == 0 { // if not omitted
		// write "V2Obj"

		logger.Fatal(config.ErrInvalidBrowserValue(err), "Invalid MINIO_BROWSER value in environment variable")
	}
	if globalBrowserEnabled {
		if redirectURL := env.Get(config.EnvBrowserRedirectURL, ""); redirectURL != "" {
			u, err := xnet.ParseHTTPURL(redirectURL)
			if err != nil {
				logger.Fatal(err, "Invalid MINIO_BROWSER_REDIRECT_URL value in environment variable")
			}
			// Look for if URL has invalid values and return error.

	ClassRRS      = "rrs"
	Optimize      = "optimize"
	InlineBlock   = "inline_block"

	// Reduced redundancy storage class environment variable
	RRSEnv = "MINIO_STORAGE_CLASS_RRS"
	// Standard storage class environment variable
	StandardEnv = "MINIO_STORAGE_CLASS_STANDARD"
	// Optimize storage class environment variable
	OptimizeEnv = "MINIO_STORAGE_CLASS_OPTIMIZE"
	// Inline block indicates the size of the shard

	// Captures all batch jobs metrics globally
	globalBatchJobsMetrics batchJobMetrics

	// Indicates if server was started as `--address ":0"`
	globalDynamicAPIPort bool

	// Add new variable global values here.
)

var globalAuthPluginMutex sync.Mutex

func newGlobalAuthNPluginFn() *idplugin.AuthNPlugin {
	globalAuthPluginMutex.Lock()
	defer globalAuthPluginMutex.Unlock()

	_ = zb0001Mask
	if z.ReplicationStats == nil {
		zb0001Len--
		zb0001Mask |= 0x80
	}
	if z.AllTierStats == nil {
		zb0001Len--
		zb0001Mask |= 0x100
	}
	// variable map header, size zb0001Len
	err = en.Append(0x80 | uint8(zb0001Len))
	if err != nil {
		return
	}
	if zb0001Len == 0 {
		return
	}
	// write "ch"
	err = en.Append(0xa2, 0x63, 0x68)

		// to set the Body to nil. But turns out too much code
		// depends on NewRequest returning a non-nil Body,
		// so we use a well-known ReadCloser variable instead
		// and have the http package also treat that sentinel
		// variable to mean explicitly zero.
		if req.GetBody != nil && req.ContentLength == 0 {
			req.Body = http.NoBody
			req.GetBody = func() (io.ReadCloser, error) { return http.NoBody, nil }

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrAdminConfigEnvOverridden: {
		Code:           "XMinioAdminConfigEnvOverridden",
		Description:    "Unable to update config via Admin API due to environment variable override",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrAdminConfigDuplicateKeys: {
		Code:           "XMinioAdminConfigDuplicateKeys",

			return fmt.Errorf("Expected command line argument %s, seen %s", cmdLine,
				s2.CmdLines[i])
		}
	}

	if reflect.DeepEqual(s1.MinioEnv, s2.MinioEnv) {
		return nil
	}

	// Report differences in environment variables.
	var missing []string
	var mismatching []string
	for k, v := range s1.MinioEnv {
		ev, ok := s2.MinioEnv[k]
		if !ok {
			missing = append(missing, k)
		} else if v != ev {

		if v, ok := cfg.HTTP[k]; ok && v.Enabled {
			// This target is already enabled using the
			// legacy environment variables, ignore.
			continue
		}
		subSysTarget := config.LoggerWebhookSubSys
		if k != config.Default {
			subSysTarget = config.LoggerWebhookSubSys + config.SubSystemSeparator + k
		}