92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cache
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import (
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"context"
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"fmt"
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"time"
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utilclock "k8s.io/apimachinery/pkg/util/clock"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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"k8s.io/apiserver/pkg/endpoints/request"
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)
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// cacheRecord holds the three return values of the authenticator.Token AuthenticateToken method
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type cacheRecord struct {
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resp *authenticator.Response
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ok bool
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err error
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}
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type cachedTokenAuthenticator struct {
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authenticator authenticator.Token
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successTTL time.Duration
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failureTTL time.Duration
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cache cache
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}
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type cache interface {
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// given a key, return the record, and whether or not it existed
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get(key string) (value *cacheRecord, exists bool)
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// caches the record for the key
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set(key string, value *cacheRecord, ttl time.Duration)
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// removes the record for the key
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remove(key string)
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}
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// New returns a token authenticator that caches the results of the specified authenticator. A ttl of 0 bypasses the cache.
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func New(authenticator authenticator.Token, successTTL, failureTTL time.Duration) authenticator.Token {
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return newWithClock(authenticator, successTTL, failureTTL, utilclock.RealClock{})
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}
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func newWithClock(authenticator authenticator.Token, successTTL, failureTTL time.Duration, clock utilclock.Clock) authenticator.Token {
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return &cachedTokenAuthenticator{
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authenticator: authenticator,
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successTTL: successTTL,
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failureTTL: failureTTL,
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cache: newStripedCache(32, fnvHashFunc, func() cache { return newSimpleCache(128, clock) }),
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}
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}
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// AuthenticateToken implements authenticator.Token
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func (a *cachedTokenAuthenticator) AuthenticateToken(ctx context.Context, token string) (*authenticator.Response, bool, error) {
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auds, _ := request.AudiencesFrom(ctx)
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key := keyFunc(auds, token)
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if record, ok := a.cache.get(key); ok {
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return record.resp, record.ok, record.err
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}
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resp, ok, err := a.authenticator.AuthenticateToken(ctx, token)
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switch {
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case ok && a.successTTL > 0:
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a.cache.set(key, &cacheRecord{resp: resp, ok: ok, err: err}, a.successTTL)
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case !ok && a.failureTTL > 0:
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a.cache.set(key, &cacheRecord{resp: resp, ok: ok, err: err}, a.failureTTL)
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}
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return resp, ok, err
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}
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func keyFunc(auds []string, token string) string {
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return fmt.Sprintf("%#v|%v", auds, token)
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}
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