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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net/http"
"path/filepath"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
gink8sauth "github.com/adambkaplan/go-k8s-middleware/gin-k8s-auth"
"github.com/gin-gonic/gin"
)
func main() {
var kubeconfig *string
if home := homedir.HomeDir(); home != "" {
kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
} else {
kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
}
flag.Parse()
r := gin.Default()
client, err := getKubeClient(*kubeconfig)
if err != nil {
fmt.Printf("WARN: %v\n", client)
}
if client != nil {
fmt.Printf("INFO: Running hello server with k8s authentication middleware")
r.Use(gink8sauth.K8SAuthenticator(client))
}
r.GET("/hello", func(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{
"message": "hello world!",
})
})
r.Run()
}
func getKubeClient(kubeconfig string) (kubernetes.Interface, error) {
config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, fmt.Errorf("failed to build kubeconfig: %v", err)
}
client, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, fmt.Errorf("failed to create kubernetes client: %v", err)
}
return client, nil
}