ARGS:
broker*              (uri)       MQTT server endpoint e.g. `tcp://localhost:1883`
topic*               (string)    name of the MQTT topic to publish
username             (string)    MQTT username
password             (string)    MQTT password
qos                  (number)    set the quality of service priority, defaults to '0'

		HTTPStatusCode: http.StatusNotImplemented,
	},
	ErrAdminLDAPExpectedLoginName: {
		Code:           "XMinioLDAPExpectedLoginName",
		Description:    "Expected LDAP short username but was given full DN.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrAdminInvalidGroupName: {
		Code:           "XMinioInvalidGroupName",
		Description:    "The group name is invalid.",

	objAPI := newObjectLayerFn()
	if objAPI == nil {
		return np, grid.NewRemoteErr(errServerNotInitialized)
	}

	accessKey := mss.Get(peerRESTUser)
	if accessKey == "" {
		return np, grid.NewRemoteErr(errors.New("username is missing"))
	}

	if err := globalIAMSys.DeleteUser(context.Background(), accessKey, false); err != nil {
		return np, grid.NewRemoteErr(err)
	}

	return np, nerr
}

		opts.claims[ldapUserN] = targetUser // simple username
		var lookupResult *xldap.DNSearchResult
		lookupResult, targetGroups, err = globalIAMSys.LDAPConfig.LookupUserDN(targetUser)
		if err != nil {
			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
			return
		}
		targetUser = lookupResult.NormDN
		opts.claims[ldapUser] = targetUser // username DN
		opts.claims[ldapActualUser] = lookupResult.ActualDN

	var parentUserActualDNList []string
	// Map of LDAP user (internal representation) to list of active credential objects
	parentUserToCredsMap := make(map[string][]auth.Credentials)
	// DN to ldap username mapping for each LDAP user
	actualDNToLDAPUsernameMap := make(map[string]string)
	// External (actual) LDAP DN to internal normalized representation
	actualDNToParentUserMap := make(map[string]string)

type iamCache struct {
	updatedAt time.Time

	// map of policy names to policy definitions
	iamPolicyDocsMap map[string]PolicyDoc

	// map of regular username to credentials
	iamUsersMap map[string]UserIdentity
	// map of regular username to policy names
	iamUserPolicyMap *xsync.MapOf[string, MappedPolicy]

	// STS accounts are loaded on demand and not via the periodic IAM reload.