Using kubeconfig

You can request Botkube to generate and pass kubeconfig file to your plugin by adding RBAC section to your plugin configuration. The following example requests a kubeconfig that impersonates user User.rbac.authorization.k8s.io read-only-user. For more information refer to the RBAC section. The example is for executor plugins, source plugins can access kubeconfig in their Stream() function in source.StreamInput.

RBAC config for an example plugin:

executors:
  "reader-team-a":
    kube-reader:
      enabled: true
      context:
        user:
          type: Static
          static:
            value: read-only-user

The kubeconfig is available in executor.ExecuteInput as a slice of bytes. There are two options to instantiate a Kubernetes Go client with this config.

1. From bytes

import (
	"context"
	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/client-go/kubernetes"
	"github.com/kubeshop/botkube/pkg/api/executor"
	"github.com/kubeshop/botkube/pkg/pluginx"
)

func (ReaderExecutor) Execute(_ context.Context, in executor.ExecuteInput) (executor.ExecuteOutput, error) {
	config, err := clientcmd.RESTConfigFromKubeConfig(in.Context.KubeConfig)
	if err != nil {
		return executor.ExecuteOutput{}, err
	}
	clientset, err := kubernetes.NewForConfig(config)
	if err != nil {
		return executor.ExecuteOutput{}, err
	}
	...
}

2. From file

import (
	"context"
	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/client-go/kubernetes"
	"github.com/kubeshop/botkube/pkg/api/executor"
	"github.com/kubeshop/botkube/pkg/pluginx"
)

func (ReaderExecutor) Execute(ctx context.Context, in executor.ExecuteInput) (executor.ExecuteOutput, error) {
	kubeConfigPath, deleteFn, err := pluginx.PersistKubeConfig(ctx, in.Context.KubeConfig)
	if err != nil {
		return executor.ExecuteOutput{}, fmt.Errorf("while writing kubeconfig file: %w", err)
	}
	defer func() {
		if deleteErr := deleteFn(ctx); deleteErr != nil {
			fmt.Fprintf(os.Stderr, "failed to delete kubeconfig file %s: %v", kubeConfigPath, deleteErr)
		}
	}()
	config, err := clientcmd.BuildConfigFromFlags("", kubeConfigPath)
	if err != nil {
		return executor.ExecuteOutput{}, err
	}
	clientset, err := kubernetes.NewForConfig(config)
	if err != nil {
		return executor.ExecuteOutput{}, err
	}
  ...
}