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bcesigner.go
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bcesigner.go
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/*
* Copyright (c) 2021 Baidu, Inc. All Rights Reserved.
*
* 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 ccegateway
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/baidubce/bce-sdk-go/auth"
"github.com/baidubce/bce-sdk-go/http"
"github.com/baidubce/bce-sdk-go/util"
corev1 "k8s.io/api/core/v1"
"github.com/baidubce/baiducloud-cce-cni-driver/cce-network-v2/pkg/logging"
)
const (
TokenKey = "token"
ExpiredAtKey = "expiredAt"
TokenSecretName = "cce-plugin-token"
TokenSecretNamespace = "kube-system"
TokenHeaderKey = "cce-token"
ClusterIDHeaderKey = "cce-cluster"
RemoteHostHeaderKey = "cce-remote-host"
EndpointOverrideEnv = "CCE_GATEWAY_ENDPOINT"
)
var (
log = logging.NewSubysLogger("cce-gateway")
)
var _ BCESigner = (*bceSigner)(nil)
type BCESigner interface {
auth.Signer
SetVolumeSource(tokenVolume string)
SetSecretSource(secretGetter func(namespace, name string) (*corev1.Secret, error))
SetTokenSource(tokenGetter func(*auth.BceCredentials, *auth.SignOptions) ([]byte, []byte, error))
GetHostAndPort() (string, int)
}
type bceSigner struct {
Region string
ClusterID string
Token string
ExpiredAt int64
tokenVolume string
secretGetter func(namespace, name string) (*corev1.Secret, error)
tokenGetter func(cred *auth.BceCredentials, opt *auth.SignOptions) ([]byte, []byte, error)
}
func NewBCESigner(region, clusterID string) *bceSigner {
return &bceSigner{
Region: region,
ClusterID: clusterID,
}
}
func (cg *bceSigner) SetVolumeSource(tokenVolume string) {
cg.tokenVolume = tokenVolume
}
func (cg *bceSigner) SetSecretSource(secretGetter func(namespace, name string) (*corev1.Secret, error)) {
cg.secretGetter = secretGetter
}
func (cg *bceSigner) SetTokenSource(tokenGetter func(*auth.BceCredentials, *auth.SignOptions) ([]byte, []byte, error)) {
cg.tokenGetter = tokenGetter
}
func (cg bceSigner) GetHostAndPort() (string, int) {
host, port := "cce-gateway.bj.baidubce.com", 80 // default host and port
if cg.Region != "" {
host = "cce-gateway." + cg.Region + ".baidubce.com"
}
if env := os.Getenv(EndpointOverrideEnv); env != "" {
// use the endpoint explicitly set in env if exists
hostPort := strings.Split(env, ":")
host = hostPort[0]
if len(hostPort) == 2 {
if portNum, err := strconv.Atoi(hostPort[1]); err == nil {
port = portNum
}
}
}
return host, port
}
func (cg *bceSigner) Sign(req *http.Request, cred *auth.BceCredentials, opt *auth.SignOptions) {
if err := cg.ensureToken(cred, opt); err != nil {
log.WithError(err).Error("ensureToken failed")
return
}
req.SetHeader(TokenHeaderKey, cg.Token)
req.SetHeader(ClusterIDHeaderKey, cg.ClusterID)
// add default content-type if not set
if req.Header("Content-Type") == "" {
req.SetHeader("Content-Type", "application/json")
}
// add x-bce-request-id if not set
if req.Header(http.BCE_REQUEST_ID) == "" {
req.SetHeader(http.BCE_REQUEST_ID, util.NewRequestId())
}
gatewayHost, gatewayPort := cg.GetHostAndPort()
reqHost := fmt.Sprintf("%s:%d", gatewayHost, gatewayPort)
// make Sign idempotent as it may be invoked many times on retry
if req.Host() != reqHost {
req.SetHeader(RemoteHostHeaderKey, req.Host())
req.SetHeader(http.HOST, reqHost)
req.SetHost(reqHost)
}
}
func (cg *bceSigner) ensureToken(cred *auth.BceCredentials, opt *auth.SignOptions) error {
if cg == nil {
return fmt.Errorf("bceSigner for cce-gateway is nil")
}
if cg.Token != "" && time.Now().Unix() < cg.ExpiredAt {
// Our token is still valid, just use it.
return nil
}
var tokenBytes, expiredAtBytes []byte
var succeeded bool
var lastErr error
// Iterate all valid sources until token is successfully fetched.
if !succeeded && cg.secretGetter != nil {
err := func() error {
tokenSecret, err := cg.secretGetter(TokenSecretNamespace, TokenSecretName)
if err != nil {
return fmt.Errorf("fail to get secret %s/%s: %w",
TokenSecretNamespace, TokenSecretName, err)
}
if tokenSecret == nil {
return fmt.Errorf("token secret is nil")
}
var ok bool
tokenBytes, ok = tokenSecret.Data[TokenKey]
if !ok {
return fmt.Errorf("fail to find token key=%s in secret", TokenKey)
}
expiredAtBytes, ok = tokenSecret.Data[ExpiredAtKey]
if !ok {
return fmt.Errorf("fail to find expiredAt key=%s in secret", ExpiredAtKey)
}
return nil
}()
if err != nil {
log.WithError(err).Error("fetch token from secret failed")
lastErr = err
} else {
succeeded = true
}
}
if !succeeded && cg.tokenVolume != "" {
err := func() error {
var err error
tokenFile := filepath.Join(cg.tokenVolume, TokenKey)
tokenBytes, err = ioutil.ReadFile(tokenFile)
if err != nil {
return fmt.Errorf("fail to read %s: %w", tokenFile, err)
}
expiredAtFile := filepath.Join(cg.tokenVolume, ExpiredAtKey)
expiredAtBytes, err = ioutil.ReadFile(expiredAtFile)
if err != nil {
return fmt.Errorf("fail to read %s: %w", expiredAtFile, err)
}
return nil
}()
if err != nil {
log.WithError(err).Error("fetch token from volume failed")
lastErr = err
} else {
succeeded = true
}
}
if !succeeded && cg.tokenGetter != nil {
var err error
tokenBytes, expiredAtBytes, err = cg.tokenGetter(cred, opt)
if err != nil {
log.WithError(err).Error("fetch token from getter failed")
lastErr = fmt.Errorf("fail to invoke tokenGetter: %w", err)
} else {
succeeded = true
}
}
if !succeeded {
return fmt.Errorf("ensureToken failed with lastErr=%v", lastErr)
}
cg.ExpiredAt, lastErr = strconv.ParseInt(string(expiredAtBytes), 10, 64)
if lastErr != nil {
return fmt.Errorf("fail to parse expiredAt=%s: %w", string(expiredAtBytes), lastErr)
}
cg.Token = string(tokenBytes)
return nil
}