| // 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 keycertbundle |
| |
| import ( |
| "os" |
| "sync" |
| ) |
| |
| import ( |
| "go.uber.org/atomic" |
| ) |
| |
| // KeyCertBundle stores the cert, private key and root cert for istiod. |
| type KeyCertBundle struct { |
| CertPem []byte |
| KeyPem []byte |
| CABundle []byte |
| } |
| |
| type Watcher struct { |
| // Indicated whether bundle has been set, it is used to invoke watcher for the first time. |
| initDone atomic.Bool |
| mutex sync.Mutex |
| bundle KeyCertBundle |
| watcherID int32 |
| watchers map[int32]chan struct{} |
| } |
| |
| func NewWatcher() *Watcher { |
| return &Watcher{ |
| watchers: make(map[int32]chan struct{}), |
| } |
| } |
| |
| // AddWatcher returns channel to receive the updated items. |
| func (w *Watcher) AddWatcher() (int32, chan struct{}) { |
| ch := make(chan struct{}, 1) |
| w.mutex.Lock() |
| defer w.mutex.Unlock() |
| id := w.watcherID |
| w.watchers[id] = ch |
| w.watcherID++ |
| |
| return id, ch |
| } |
| |
| // RemoveWatcher removes the given watcher. |
| func (w *Watcher) RemoveWatcher(id int32) { |
| w.mutex.Lock() |
| defer w.mutex.Unlock() |
| ch := w.watchers[id] |
| if ch != nil { |
| close(ch) |
| } |
| delete(w.watchers, id) |
| } |
| |
| // SetAndNotify sets the key cert and root cert and notify the watchers. |
| func (w *Watcher) SetAndNotify(key, cert, caBundle []byte) { |
| w.mutex.Lock() |
| defer w.mutex.Unlock() |
| if len(key) != 0 { |
| w.bundle.KeyPem = key |
| } |
| if len(cert) != 0 { |
| w.bundle.CertPem = cert |
| } |
| if len(caBundle) != 0 { |
| w.bundle.CABundle = caBundle |
| } |
| w.initDone.Store(true) |
| for _, ch := range w.watchers { |
| select { |
| case ch <- struct{}{}: |
| default: |
| } |
| } |
| } |
| |
| // SetFromFilesAndNotify sets the key cert and root cert from files and notify the watchers. |
| func (w *Watcher) SetFromFilesAndNotify(keyFile, certFile, rootCert string) error { |
| cert, err := os.ReadFile(certFile) |
| if err != nil { |
| return err |
| } |
| key, err := os.ReadFile(keyFile) |
| if err != nil { |
| return err |
| } |
| caBundle, err := os.ReadFile(rootCert) |
| if err != nil { |
| return err |
| } |
| w.mutex.Lock() |
| defer w.mutex.Unlock() |
| if len(key) != 0 { |
| w.bundle.KeyPem = key |
| } |
| if len(cert) != 0 { |
| w.bundle.CertPem = cert |
| } |
| if len(caBundle) != 0 { |
| w.bundle.CABundle = caBundle |
| } |
| w.initDone.Store(true) |
| for _, ch := range w.watchers { |
| select { |
| case ch <- struct{}{}: |
| default: |
| } |
| } |
| return nil |
| } |
| |
| // GetCABundle returns the CABundle. |
| func (w *Watcher) GetCABundle() []byte { |
| w.mutex.Lock() |
| defer w.mutex.Unlock() |
| return w.bundle.CABundle |
| } |
| |
| // GetCABundle returns the CABundle. |
| func (w *Watcher) GetKeyCertBundle() KeyCertBundle { |
| w.mutex.Lock() |
| defer w.mutex.Unlock() |
| return w.bundle |
| } |