Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/k8s.io/kubernetes/cmd/kubeadm/app/discovery/discovery.go

@@ -0,0 +1,72 @@
+/*
+Copyright 2016 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 discovery
+
+import (
+	"fmt"
+	"net/url"
+
+	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
+	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
+	"k8s.io/kubernetes/cmd/kubeadm/app/discovery/file"
+	"k8s.io/kubernetes/cmd/kubeadm/app/discovery/https"
+	"k8s.io/kubernetes/cmd/kubeadm/app/discovery/token"
+	kubeconfigutil "k8s.io/kubernetes/cmd/kubeadm/app/util/kubeconfig"
+)
+
+// TokenUser defines token user
+const TokenUser = "tls-bootstrap-token-user"
+
+// For returns a KubeConfig object that can be used for doing the TLS Bootstrap with the right credentials
+// Also, before returning anything, it makes sure it can trust the API Server
+func For(cfg *kubeadmapi.NodeConfiguration) (*clientcmdapi.Config, error) {
+	// TODO: Print summary info about the CA certificate, along with the checksum signature
+	// we also need an ability for the user to configure the client to validate received CA cert against a checksum
+	clusterinfo, err := GetValidatedClusterInfoObject(cfg)
+	if err != nil {
+		return nil, fmt.Errorf("couldn't validate the identity of the API Server: %v", err)
+	}
+
+	return kubeconfigutil.CreateWithToken(
+		clusterinfo.Server,
+		cfg.ClusterName,
+		TokenUser,
+		clusterinfo.CertificateAuthorityData,
+		cfg.TLSBootstrapToken,
+	), nil
+}
+
+// GetValidatedClusterInfoObject returns a validated Cluster object that specifies where the cluster is and the CA cert to trust
+func GetValidatedClusterInfoObject(cfg *kubeadmapi.NodeConfiguration) (*clientcmdapi.Cluster, error) {
+	switch {
+	case len(cfg.DiscoveryFile) != 0:
+		if isHTTPSURL(cfg.DiscoveryFile) {
+			return https.RetrieveValidatedClusterInfo(cfg.DiscoveryFile, cfg.ClusterName)
+		}
+		return file.RetrieveValidatedClusterInfo(cfg.DiscoveryFile, cfg.ClusterName)
+	case len(cfg.DiscoveryToken) != 0:
+		return token.RetrieveValidatedClusterInfo(cfg)
+	default:
+		return nil, fmt.Errorf("couldn't find a valid discovery configuration")
+	}
+}
+
+// isHTTPSURL checks whether the string is parsable as a URL and whether the Scheme is https
+func isHTTPSURL(s string) bool {
+	u, err := url.Parse(s)
+	return err == nil && u.Scheme == "https"
+}