1 files changed, 29 insertions, 36 deletions

diff --git a/vendor/google.golang.org/grpc/credentials/oauth/oauth.go b/vendor/google.golang.org/grpc/credentials/oauth/oauth.go
index 25393cc..f6d597a 100644
--- a/vendor/google.golang.org/grpc/credentials/oauth/oauth.go
+++ b/vendor/google.golang.org/grpc/credentials/oauth/oauth.go
@@ -1,33 +1,18 @@
 /*
  *
- * Copyright 2015, Google Inc.
- * All rights reserved.
+ * Copyright 2015 gRPC authors.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
+ * 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
  *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 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.
  *
  */
 
@@ -37,6 +22,7 @@ package oauth
 import (
 	"fmt"
 	"io/ioutil"
+	"sync"
 
 	"golang.org/x/net/context"
 	"golang.org/x/oauth2"
@@ -94,7 +80,7 @@ func (j jwtAccess) GetRequestMetadata(ctx context.Context, uri ...string) (map[s
 		return nil, err
 	}
 	return map[string]string{
-		"authorization": token.TokenType + " " + token.AccessToken,
+		"authorization": token.Type() + " " + token.AccessToken,
 	}, nil
 }
 
@@ -114,7 +100,7 @@ func NewOauthAccess(token *oauth2.Token) credentials.PerRPCCredentials {
 
 func (oa oauthAccess) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
 	return map[string]string{
-		"authorization": oa.token.TokenType + " " + oa.token.AccessToken,
+		"authorization": oa.token.Type() + " " + oa.token.AccessToken,
 	}, nil
 }
 
@@ -132,20 +118,27 @@ func NewComputeEngine() credentials.PerRPCCredentials {
 
 // serviceAccount represents PerRPCCredentials via JWT signing key.
 type serviceAccount struct {
+	mu     sync.Mutex
 	config *jwt.Config
-}
-
-func (s serviceAccount) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
-	token, err := s.config.TokenSource(ctx).Token()
-	if err != nil {
-		return nil, err
+	t      *oauth2.Token
+}
+
+func (s *serviceAccount) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if !s.t.Valid() {
+		var err error
+		s.t, err = s.config.TokenSource(ctx).Token()
+		if err != nil {
+			return nil, err
+		}
 	}
 	return map[string]string{
-		"authorization": token.TokenType + " " + token.AccessToken,
+		"authorization": s.t.Type() + " " + s.t.AccessToken,
 	}, nil
 }
 
-func (s serviceAccount) RequireTransportSecurity() bool {
+func (s *serviceAccount) RequireTransportSecurity() bool {
 	return true
 }
 
@@ -156,7 +149,7 @@ func NewServiceAccountFromKey(jsonKey []byte, scope ...string) (credentials.PerR
 	if err != nil {
 		return nil, err
 	}
-	return serviceAccount{config: config}, nil
+	return &serviceAccount{config: config}, nil
 }
 
 // NewServiceAccountFromFile constructs the PerRPCCredentials using the JSON key file