add union auth request handler

plugin/pkg/auth/authenticator/request/union/union.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 union
+
+import (
+	"net/http"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/authenticator"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/user"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+)
+
+// unionAuthRequestHandler authenticates requests using a chain of authenticator.Requests
+type unionAuthRequestHandler []authenticator.Request
+
+// New returns a request authenticator that validates credentials using a chain of authenticator.Request objects
+func New(authRequestHandlers ...authenticator.Request) authenticator.Request {
+	return unionAuthRequestHandler(authRequestHandlers)
+}
+
+// AuthenticateRequest authenticates the request using a chain of authenticator.Request objects.  The first
+// success returns that identity.  Errors are only returned if no matches are found.
+func (authHandler unionAuthRequestHandler) AuthenticateRequest(req *http.Request) (user.Info, bool, error) {
+	var errors util.ErrorList
+	for _, currAuthRequestHandler := range authHandler {
+		info, ok, err := currAuthRequestHandler.AuthenticateRequest(req)
+		if err != nil {
+			errors = append(errors, err)
+			continue
+		}
+
+		if ok {
+			return info, true, nil
+		}
+	}
+
+	return nil, false, errors.ToError()
+}

plugin/pkg/auth/authenticator/request/union/unionauth_test.go

@@ -0,0 +1,145 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 union
+
+import (
+	"errors"
+	"net/http"
+	"reflect"
+	"strings"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/user"
+)
+
+type mockAuthRequestHandler struct {
+	returnUser      user.Info
+	isAuthenticated bool
+	err             error
+}
+
+var (
+	user1 = &user.DefaultInfo{Name: "fresh_ferret", UID: "alfa"}
+	user2 = &user.DefaultInfo{Name: "elegant_sheep", UID: "bravo"}
+)
+
+func (mock *mockAuthRequestHandler) AuthenticateRequest(req *http.Request) (user.Info, bool, error) {
+	return mock.returnUser, mock.isAuthenticated, mock.err
+}
+
+func TestAuthenticateRequestSecondPasses(t *testing.T) {
+	handler1 := &mockAuthRequestHandler{returnUser: user1}
+	handler2 := &mockAuthRequestHandler{returnUser: user2, isAuthenticated: true}
+	authRequestHandler := New(handler1, handler2)
+	req, _ := http.NewRequest("GET", "http://example.org", nil)
+
+	authenticatedUser, isAuthenticated, err := authRequestHandler.AuthenticateRequest(req)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	if !isAuthenticated {
+		t.Errorf("Unexpectedly unauthenticated: %v", isAuthenticated)
+	}
+	if !reflect.DeepEqual(user2, authenticatedUser) {
+		t.Errorf("Expected %v, got %v", user2, authenticatedUser)
+	}
+}
+
+func TestAuthenticateRequestFirstPasses(t *testing.T) {
+	handler1 := &mockAuthRequestHandler{returnUser: user1, isAuthenticated: true}
+	handler2 := &mockAuthRequestHandler{returnUser: user2}
+	authRequestHandler := New(handler1, handler2)
+	req, _ := http.NewRequest("GET", "http://example.org", nil)
+
+	authenticatedUser, isAuthenticated, err := authRequestHandler.AuthenticateRequest(req)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	if !isAuthenticated {
+		t.Errorf("Unexpectedly unauthenticated: %v", isAuthenticated)
+	}
+	if !reflect.DeepEqual(user1, authenticatedUser) {
+		t.Errorf("Expected %v, got %v", user1, authenticatedUser)
+	}
+}
+
+func TestAuthenticateRequestSuppressUnnecessaryErrors(t *testing.T) {
+	handler1 := &mockAuthRequestHandler{err: errors.New("first")}
+	handler2 := &mockAuthRequestHandler{isAuthenticated: true}
+	authRequestHandler := New(handler1, handler2)
+	req, _ := http.NewRequest("GET", "http://example.org", nil)
+
+	_, isAuthenticated, err := authRequestHandler.AuthenticateRequest(req)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	if !isAuthenticated {
+		t.Errorf("Unexpectedly unauthenticated: %v", isAuthenticated)
+	}
+}
+
+func TestAuthenticateRequestNoAuthenticators(t *testing.T) {
+	authRequestHandler := New()
+	req, _ := http.NewRequest("GET", "http://example.org", nil)
+
+	authenticatedUser, isAuthenticated, err := authRequestHandler.AuthenticateRequest(req)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	if isAuthenticated {
+		t.Errorf("Unexpectedly authenticated: %v", isAuthenticated)
+	}
+	if authenticatedUser != nil {
+		t.Errorf("Unexpected authenticatedUser: %v", authenticatedUser)
+	}
+}
+
+func TestAuthenticateRequestNonePass(t *testing.T) {
+	handler1 := &mockAuthRequestHandler{}
+	handler2 := &mockAuthRequestHandler{}
+	authRequestHandler := New(handler1, handler2)
+	req, _ := http.NewRequest("GET", "http://example.org", nil)
+
+	_, isAuthenticated, err := authRequestHandler.AuthenticateRequest(req)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	if isAuthenticated {
+		t.Errorf("Unexpectedly authenticated: %v", isAuthenticated)
+	}
+}
+
+func TestAuthenticateRequestAdditiveErrors(t *testing.T) {
+	handler1 := &mockAuthRequestHandler{err: errors.New("first")}
+	handler2 := &mockAuthRequestHandler{err: errors.New("second")}
+	authRequestHandler := New(handler1, handler2)
+	req, _ := http.NewRequest("GET", "http://example.org", nil)
+
+	_, isAuthenticated, err := authRequestHandler.AuthenticateRequest(req)
+	if err == nil {
+		t.Errorf("Expected an error")
+	}
+	if !strings.Contains(err.Error(), "first") {
+		t.Errorf("Expected error containing %v, got %v", "first", err)
+	}
+	if !strings.Contains(err.Error(), "second") {
+		t.Errorf("Expected error containing %v, got %v", "second", err)
+	}
+	if isAuthenticated {
+		t.Errorf("Unexpectedly authenticated: %v", isAuthenticated)
+	}
+}