update admission webhook to handle multiple auth domains

plugin/pkg/admission/webhook/authentication_test.go

@@ -0,0 +1,130 @@
+/*
+Copyright 2017 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 webhook
+
+import (
+	"testing"
+
+	"k8s.io/apimachinery/pkg/api/equality"
+	"k8s.io/apimachinery/pkg/util/diff"
+	"k8s.io/client-go/rest"
+	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
+)
+
+func TestAuthenticationDetection(t *testing.T) {
+	tests := []struct {
+		name       string
+		kubeconfig clientcmdapi.Config
+		serverName string
+		expected   rest.Config
+	}{
+		{
+			name:       "empty",
+			serverName: "foo.com",
+		},
+		{
+			name:       "fallback to current context",
+			serverName: "foo.com",
+			kubeconfig: clientcmdapi.Config{
+				AuthInfos: map[string]*clientcmdapi.AuthInfo{
+					"bar.com": {Token: "bar"},
+				},
+				Contexts: map[string]*clientcmdapi.Context{
+					"ctx": {
+						AuthInfo: "bar.com",
+					},
+				},
+				CurrentContext: "ctx",
+			},
+			expected: rest.Config{BearerToken: "bar"},
+		},
+		{
+			name:       "exact match",
+			serverName: "foo.com",
+			kubeconfig: clientcmdapi.Config{
+				AuthInfos: map[string]*clientcmdapi.AuthInfo{
+					"foo.com": {Token: "foo"},
+					"*.com":   {Token: "foo-star"},
+					"bar.com": {Token: "bar"},
+				},
+			},
+			expected: rest.Config{BearerToken: "foo"},
+		},
+		{
+			name:       "partial star match",
+			serverName: "foo.com",
+			kubeconfig: clientcmdapi.Config{
+				AuthInfos: map[string]*clientcmdapi.AuthInfo{
+					"*.com":   {Token: "foo-star"},
+					"bar.com": {Token: "bar"},
+				},
+			},
+			expected: rest.Config{BearerToken: "foo-star"},
+		},
+		{
+			name:       "full star match",
+			serverName: "foo.com",
+			kubeconfig: clientcmdapi.Config{
+				AuthInfos: map[string]*clientcmdapi.AuthInfo{
+					"*":       {Token: "star"},
+					"bar.com": {Token: "bar"},
+				},
+			},
+			expected: rest.Config{BearerToken: "star"},
+		},
+		{
+			name:       "skip bad in cluster config",
+			serverName: "kubernetes.default.svc",
+			kubeconfig: clientcmdapi.Config{
+				AuthInfos: map[string]*clientcmdapi.AuthInfo{
+					"*":       {Token: "star"},
+					"bar.com": {Token: "bar"},
+				},
+			},
+			expected: rest.Config{BearerToken: "star"},
+		},
+		{
+			name:       "most selective",
+			serverName: "one.two.three.com",
+			kubeconfig: clientcmdapi.Config{
+				AuthInfos: map[string]*clientcmdapi.AuthInfo{
+					"*.two.three.com": {Token: "first"},
+					"*.three.com":     {Token: "second"},
+					"*.com":           {Token: "third"},
+				},
+			},
+			expected: rest.Config{BearerToken: "first"},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			resolver := defaultAuthenticationInfoResolver{kubeconfig: tc.kubeconfig}
+			actual, err := resolver.ClientConfigFor(tc.serverName)
+			if err != nil {
+				t.Fatal(err)
+			}
+			actual.UserAgent = ""
+			actual.Timeout = 0
+
+			if !equality.Semantic.DeepEqual(*actual, tc.expected) {
+				t.Errorf("%v", diff.ObjectReflectDiff(tc.expected, *actual))
+			}
+		})
+	}
+
+}