Istio Kubeconfig Extension

main.go

package main

import (
	"fmt"

	"encoding/json"
	"istio.io/istio/pkg/kube"
	"k8s.io/apimachinery/pkg/runtime"
)

/*
Kubeconfig contains something like:
apiVersion: v1
extensions:
- name: istio
  extension:
    types:
    - config
    - secret
    network: nw1
*/

const Kubeconfig = "/Users/landow/kubeconf/kind-istio-testing.yaml"

type IstioKubeconfigType string

const (
	Config IstioKubeconfigType = "config"
	Secret                     = "secret"
)

type IstioKubeconfigExtension struct {
	Network string                `json:"network"`
	Types   []IstioKubeconfigType `json:"types"`
}

func main() {
	clientConfig := kube.BuildClientCmd(Kubeconfig, "")
	rawConfig, err := clientConfig.RawConfig()
	if err != nil {
		panic(err)
	}
	ext := rawConfig.Clusters["kind-istio-testing"].Extensions["istio"]
	if ext == nil {
		panic("istio extension not found")
	}
	istioExt := IstioKubeconfigExtension{}
	if err := json.Unmarshal(ext.(*runtime.Unknown).Raw, &istioExt); err != nil {
		panic(err)
	}
	fmt.Println(istioExt)
}