tenantnamespace_helper.go

/*
Copyright 2019 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package tenantnamespace

import (
	"bytes"
	"context"
	"encoding/base64"
	"fmt"
	"html/template"
	"strings"

	corev1 "k8s.io/api/core/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/reconcile"
)

const (
	cfgTemplate = `
kind: Config
apiVersion: v1
users:
- name: {{ .username }}
  user:
    token: {{ .token }}
clusters:
- name: {{ .cluster }}
  cluster:
    certificate-authority-data: {{ .ca }}
    server: {{ .master }}
contexts:
- context:
    cluster: {{ .cluster }}
    user: {{ .username }}
  name: default
current-context: default
preferences: {}
`
)

func GenerateCfgStr(clusterName string, ip string, ca, token []byte, username string) (string, error) {
	de := base64.StdEncoding.EncodeToString(token)
	r, _ := base64.StdEncoding.DecodeString(de)
	ctx := map[string]string{
		"ca":       base64.StdEncoding.EncodeToString(ca),
		"token":    string(r),
		"username": username,
		"master":   ip,
		"cluster":  clusterName,
	}

	return getTemplateContent(cfgTemplate, ctx)
}

// getTemplateContent fills out the kubeconfig templates based on the context
func getTemplateContent(kubeConfigTmpl string, context interface{}) (string, error) {
	t, tmplPrsErr := template.New("test").Parse(kubeConfigTmpl)
	if tmplPrsErr != nil {
		return "", tmplPrsErr
	}
	writer := bytes.NewBuffer([]byte{})
	if err := t.Execute(writer, context); nil != err {
		return "", err
	}

	return writer.String(), nil
}

//findSecretNameOfSA: get secret name of tenant admin service account
func findSecretNameOfSA(c client.Client, saName string) (string, error) {
	var saSecretName string
	secretList := corev1.SecretList{}
	if err := c.List(context.TODO(), &secretList, &client.ListOptions{}); err != nil {
		return "", err
	}
	for _, eachSecret := range secretList.Items {
		//checks secret type and annotations
		if v, ok := eachSecret.Annotations[corev1.ServiceAccountNameKey]; ok && strings.EqualFold(v, saName) && (eachSecret.Type == corev1.SecretTypeServiceAccountToken) {
			saSecretName = eachSecret.Name
			break
		}
	}

	return saSecretName, nil
}

func getUniqueName(str, a string) string {
	return fmt.Sprintf("%+v-%+v", str, a)
}

// SetupTestReconcile returns a reconcile.Reconcile implementation that delegates to inner and
// writes the request to requests after Reconcile is finished.
func SetupTestReconcile(inner reconcile.Reconciler) (reconcile.Reconciler, chan reconcile.Request) {
	requests := make(chan reconcile.Request)
	fn := reconcile.Func(func(req reconcile.Request) (reconcile.Result, error) {
		result, err := inner.Reconcile(req)
		requests <- req
		return result, err
	})
	return fn, requests
}