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token.go
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token.go
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// Copyright 2022-2023 vArmor 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 utils
import (
"os"
"sync"
"time"
"github.com/go-logr/logr"
)
const BindTokenPath = "/var/run/secrets/tokens/bound-token"
var (
token string
mu sync.RWMutex
updateChan chan bool
AgentReady int32 = 0
)
func InitAndStartTokenRotation(interval time.Duration, logger logr.Logger) {
updateToken(BindTokenPath, logger)
updateChan = make(chan bool)
go startTokenRotation(BindTokenPath, interval, logger, updateChan)
}
func startTokenRotation(filePath string, interval time.Duration, logger logr.Logger, update chan bool) {
ticker := time.NewTicker(interval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
updateToken(filePath, logger)
case <-update:
updateToken(filePath, logger)
}
}
}
func updateToken(filePath string, logger logr.Logger) {
newToken, err := os.ReadFile(filePath)
if err != nil {
logger.Error(err, "fatal error: update agent bind token error")
os.Exit(1)
}
mu.Lock()
token = string(newToken)
mu.Unlock()
}
func GetToken() string {
mu.RLock()
defer mu.RUnlock()
return token
}