/
visibility.go
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/
visibility.go
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// Copyright Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package visibility
import (
"fmt"
"istio.io/istio/pkg/config/labels"
)
// Instance defines whether a given config or service is exported to local namespace, some set of namespaces, or
// all namespaces or none
type Instance string
const (
// Private implies namespace local config
Private Instance = "."
// Public implies config is visible to all
Public Instance = "*"
// None implies service is visible to no one. Used for services only
None Instance = "~"
)
// Validate a visibility value ( ./*/~/some namespace name which is DNS1123 label)
func (v Instance) Validate() (errs error) {
switch v {
case Private, Public:
return nil
case None:
return fmt.Errorf("exportTo ~ (none) is not allowed for Istio configuration objects")
default:
if !labels.IsDNS1123Label(string(v)) {
return fmt.Errorf("only .,*, or a valid DNS 1123 label is allowed as exportTo entry")
}
}
return nil
}