add support for auth providers

pkg/authproviders/authprovider.go

@@ -0,0 +1,21 @@
+package authproviders
+
+import (
+	"fmt"
+
+	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
+)
+
+//GetToken gets the token from auth provider config
+func GetToken(ap *clientcmdapi.AuthProviderConfig) (string, error) {
+	switch ap.Name {
+	case "gcp":
+		return ap.Config["access-token"], nil
+	case "azure":
+		return ap.Config["access-token"], nil
+	case "oidc":
+		return ap.Config["id-token"], nil
+	}
+
+	return "", fmt.Errorf("unsupported auth provider %s", ap.Name)
+}

pkg/cmd/whoami.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"os"
 
+	"github.com/rajatjindal/kubectl-whoami/pkg/authproviders"
 	"github.com/rajatjindal/kubectl-whoami/pkg/k8s"
 	"github.com/spf13/cobra"
 	"k8s.io/cli-runtime/pkg/genericclioptions"
@@ -100,6 +101,25 @@ func (o *WhoAmIOptions) Run() error {
 		return err
 	}
 
+	if config.AuthProvider != nil {
+		token, err := authproviders.GetToken(config.AuthProvider)
+		if err != nil {
+			return err
+		}
+
+		username, err := k8s.WhoAmI(o.kubeclient, token)
+		if err != nil {
+			return err
+		}
+
+		if username == "" {
+			return fmt.Errorf("failed to find subject of token. please report a ticket at https://github.com/rajatjindal/kubectl-whoami")
+		}
+
+		fmt.Println(username)
+		return nil
+	}
+
 	c, err := config.TransportConfig()
 	if err != nil {
 		return err