metrics-server/vendor/k8s.io/apiserver/pkg/authorization/authorizerfactory/delegating.go

/*
Copyright 2016 The Kubernetes 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 authorizerfactory

import (
	"time"

	"k8s.io/apiserver/pkg/authorization/authorizer"
	authorizationclient "k8s.io/client-go/kubernetes/typed/authorization/v1beta1"

	"k8s.io/apiserver/plugin/pkg/authorizer/webhook"
)

// DelegatingAuthorizerConfig is the minimal configuration needed to create an authenticator
// built to delegate authorization to a kube API server
type DelegatingAuthorizerConfig struct {
	SubjectAccessReviewClient authorizationclient.SubjectAccessReviewInterface

	// AllowCacheTTL is the length of time that a successful authorization response will be cached
	AllowCacheTTL time.Duration

	// DenyCacheTTL is the length of time that an unsuccessful authorization response will be cached.
	// You generally want more responsive, "deny, try again" flows.
	DenyCacheTTL time.Duration
}

func (c DelegatingAuthorizerConfig) New() (authorizer.Authorizer, error) {
	return webhook.NewFromInterface(
		c.SubjectAccessReviewClient,
		c.AllowCacheTTL,
		c.DenyCacheTTL,
	)
}