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client.go
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client.go
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package eks
import (
"encoding/base64"
"fmt"
"net/http"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sts"
"go.uber.org/zap"
"golang.org/x/oauth2"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
clientset "k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
func (ts *Tester) createK8sClientSet() (err error) {
ts.lg.Info("loading *restclient.Config")
cfg := ts.createClientConfig()
if cfg == nil {
ts.lg.Warn("*restclient.Config is nil; reading kubeconfig")
cfg, err = clientcmd.BuildConfigFromFlags("", ts.cfg.KubeConfigPath)
if err != nil {
ts.lg.Warn("failed to read kubeconfig", zap.Error(err))
return err
}
ts.lg.Info("loaded *restclient.Config from kubeconfig")
} else {
ts.lg.Info("loaded *restclient.Config from eksconfig")
}
ts.lg.Info("creating k8s client set")
ts.k8sClientSet, err = clientset.NewForConfig(cfg)
if err == nil {
ts.lg.Info("created k8s client set")
return nil
}
ts.lg.Warn("failed to create k8s client set", zap.Error(err))
return err
}
const authProviderName = "eks"
func (ts *Tester) createClientConfig() *restclient.Config {
if ts.cfg.Name == "" {
return nil
}
if ts.cfg.Region == "" {
return nil
}
if ts.cfg.Status.ClusterAPIServerEndpoint == "" {
return nil
}
if ts.cfg.Status.ClusterCADecoded == "" {
return nil
}
return &restclient.Config{
Host: ts.cfg.Status.ClusterAPIServerEndpoint,
TLSClientConfig: restclient.TLSClientConfig{
CAData: []byte(ts.cfg.Status.ClusterCADecoded),
},
AuthProvider: &clientcmdapi.AuthProviderConfig{
Name: authProviderName,
Config: map[string]string{
"region": ts.cfg.Region,
"cluster-name": ts.cfg.Name,
},
},
}
}
func init() {
restclient.RegisterAuthProviderPlugin(authProviderName, newAuthProvider)
}
func newAuthProvider(_ string, config map[string]string, _ restclient.AuthProviderConfigPersister) (restclient.AuthProvider, error) {
awsRegion, ok := config["region"]
if !ok {
return nil, fmt.Errorf("'clientcmdapi.AuthProviderConfig' does not include 'region' key %+v", config)
}
clusterName, ok := config["cluster-name"]
if !ok {
return nil, fmt.Errorf("'clientcmdapi.AuthProviderConfig' does not include 'cluster-name' key %+v", config)
}
sess := session.Must(session.NewSession(aws.NewConfig().WithRegion(awsRegion)))
return &eksAuthProvider{ts: newTokenSource(sess, clusterName)}, nil
}
type eksAuthProvider struct {
ts oauth2.TokenSource
}
func (p *eksAuthProvider) WrapTransport(rt http.RoundTripper) http.RoundTripper {
return &oauth2.Transport{
Source: p.ts,
Base: rt,
}
}
func (p *eksAuthProvider) Login() error {
return nil
}
func newTokenSource(sess *session.Session, clusterName string) oauth2.TokenSource {
return &eksTokenSource{sess: sess, clusterName: clusterName}
}
type eksTokenSource struct {
sess *session.Session
clusterName string
}
// Reference
// https://github.com/kubernetes-sigs/aws-iam-authenticator/blob/master/README.md#api-authorization-from-outside-a-cluster
// https://github.com/kubernetes-sigs/aws-iam-authenticator/blob/master/pkg/token/token.go
const (
v1Prefix = "k8s-aws-v1."
clusterIDHeader = "x-k8s-aws-id"
)
func (s *eksTokenSource) Token() (*oauth2.Token, error) {
stsAPI := sts.New(s.sess)
request, _ := stsAPI.GetCallerIdentityRequest(&sts.GetCallerIdentityInput{})
request.HTTPRequest.Header.Add(clusterIDHeader, s.clusterName)
payload, err := request.Presign(60)
if err != nil {
return nil, err
}
token := v1Prefix + base64.RawURLEncoding.EncodeToString([]byte(payload))
tokenExpiration := time.Now().Local().Add(14 * time.Minute)
return &oauth2.Token{
AccessToken: token,
TokenType: "Bearer",
Expiry: tokenExpiration,
}, nil
}
func (ts *Tester) getPods(ns string) (*v1.PodList, error) {
return ts.k8sClientSet.CoreV1().Pods(ns).List(metav1.ListOptions{})
}
func (ts *Tester) getAllNodes() (*v1.NodeList, error) {
return ts.k8sClientSet.CoreV1().Nodes().List(metav1.ListOptions{})
}