Merge M3 into MCS (#187)

* Merge M3 into MCS

* Fix Linting

* Add missing cluster folder

cluster/cluster.go

@@ -0,0 +1,52 @@
+// This file is part of MinIO Kubernetes Cloud
+// Copyright (c) 2019 MinIO, Inc.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package cluster
+
+import (
+	operator "github.com/minio/minio-operator/pkg/client/clientset/versioned"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	certutil "k8s.io/client-go/util/cert"
+)
+
+func GetK8sConfig(token string) *rest.Config {
+	// if m3 is running inside k8s by default he will have access to the ca cert from the k8s local authority
+	const (
+		rootCAFile = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
+	)
+	tlsClientConfig := rest.TLSClientConfig{Insecure: getK8sAPIServerInsecure()}
+	if _, err := certutil.NewPool(rootCAFile); err == nil {
+		tlsClientConfig.CAFile = rootCAFile
+	}
+	config := &rest.Config{
+		Host:            getK8sAPIServer(),
+		TLSClientConfig: tlsClientConfig,
+		APIPath:         "/",
+		BearerToken:     token,
+	}
+	return config
+}
+
+// OperatorClient returns an operator client using GetK8sConfig for its config
+func OperatorClient(token string) (*operator.Clientset, error) {
+	return operator.NewForConfig(GetK8sConfig(token))
+}
+
+// K8sClient returns kubernetes client using GetK8sConfig for its config
+func K8sClient(token string) (*kubernetes.Clientset, error) {
+	return kubernetes.NewForConfig(GetK8sConfig(token))
+}