72 lines
2.0 KiB
Go
72 lines
2.0 KiB
Go
/*
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Copyright 2023 The Dapr 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 crypto
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import (
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"context"
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"sync"
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"github.com/chebyrash/promise"
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"github.com/lestrrat-go/jwx/v2/jwk"
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)
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// GetKeyFn is the type of the getKeyFn function used by the PubKeyCache.
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type GetKeyFn = func(key string) func(resolve func(jwk.Key), reject func(error))
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// PubKeyCache implements GetKey with a local cache.
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type PubKeyCache struct {
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getKeyFn GetKeyFn
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pubKeys map[string]*promise.Promise[jwk.Key]
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pubKeysLock *sync.Mutex
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}
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// NewPubKeyCache returns a new PubKeyCache object
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func NewPubKeyCache(getKeyFn GetKeyFn) *PubKeyCache {
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return &PubKeyCache{
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getKeyFn: getKeyFn,
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pubKeys: map[string]*promise.Promise[jwk.Key]{},
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pubKeysLock: &sync.Mutex{},
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}
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}
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// GetKey returns a public key from the cache, or uses getKeyFn to request it
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func (kc *PubKeyCache) GetKey(parentCtx context.Context, key string) (pubKey jwk.Key, err error) {
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timeoutPromise := promise.New(func(_ func(jwk.Key), reject func(error)) {
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<-parentCtx.Done()
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reject(parentCtx.Err())
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})
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// Check if the key is in the cache already
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kc.pubKeysLock.Lock()
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p, ok := kc.pubKeys[key]
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if ok {
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kc.pubKeysLock.Unlock()
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return promise.Race(p, timeoutPromise).Await()
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}
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// Create a new promise, which resolves with a background context
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p = promise.New(kc.getKeyFn(key))
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p = promise.Catch(p, func(err error) error {
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kc.pubKeysLock.Lock()
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delete(kc.pubKeys, key)
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kc.pubKeysLock.Unlock()
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return err
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})
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kc.pubKeys[key] = p
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kc.pubKeysLock.Unlock()
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return promise.Race(p, timeoutPromise).Await()
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}
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