update vendor

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/google.golang.org/grpc/credentials/oauth/oauth.go

@@ -0,0 +1,173 @@
+/*
+ *
+ * Copyright 2015 gRPC 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 oauth implements gRPC credentials using OAuth.
+package oauth
+
+import (
+	"fmt"
+	"io/ioutil"
+	"sync"
+
+	"golang.org/x/net/context"
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
+	"golang.org/x/oauth2/jwt"
+	"google.golang.org/grpc/credentials"
+)
+
+// TokenSource supplies PerRPCCredentials from an oauth2.TokenSource.
+type TokenSource struct {
+	oauth2.TokenSource
+}
+
+// GetRequestMetadata gets the request metadata as a map from a TokenSource.
+func (ts TokenSource) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
+	token, err := ts.Token()
+	if err != nil {
+		return nil, err
+	}
+	return map[string]string{
+		"authorization": token.Type() + " " + token.AccessToken,
+	}, nil
+}
+
+// RequireTransportSecurity indicates whether the credentials requires transport security.
+func (ts TokenSource) RequireTransportSecurity() bool {
+	return true
+}
+
+type jwtAccess struct {
+	jsonKey []byte
+}
+
+// NewJWTAccessFromFile creates PerRPCCredentials from the given keyFile.
+func NewJWTAccessFromFile(keyFile string) (credentials.PerRPCCredentials, error) {
+	jsonKey, err := ioutil.ReadFile(keyFile)
+	if err != nil {
+		return nil, fmt.Errorf("credentials: failed to read the service account key file: %v", err)
+	}
+	return NewJWTAccessFromKey(jsonKey)
+}
+
+// NewJWTAccessFromKey creates PerRPCCredentials from the given jsonKey.
+func NewJWTAccessFromKey(jsonKey []byte) (credentials.PerRPCCredentials, error) {
+	return jwtAccess{jsonKey}, nil
+}
+
+func (j jwtAccess) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
+	ts, err := google.JWTAccessTokenSourceFromJSON(j.jsonKey, uri[0])
+	if err != nil {
+		return nil, err
+	}
+	token, err := ts.Token()
+	if err != nil {
+		return nil, err
+	}
+	return map[string]string{
+		"authorization": token.Type() + " " + token.AccessToken,
+	}, nil
+}
+
+func (j jwtAccess) RequireTransportSecurity() bool {
+	return true
+}
+
+// oauthAccess supplies PerRPCCredentials from a given token.
+type oauthAccess struct {
+	token oauth2.Token
+}
+
+// NewOauthAccess constructs the PerRPCCredentials using a given token.
+func NewOauthAccess(token *oauth2.Token) credentials.PerRPCCredentials {
+	return oauthAccess{token: *token}
+}
+
+func (oa oauthAccess) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
+	return map[string]string{
+		"authorization": oa.token.Type() + " " + oa.token.AccessToken,
+	}, nil
+}
+
+func (oa oauthAccess) RequireTransportSecurity() bool {
+	return true
+}
+
+// NewComputeEngine constructs the PerRPCCredentials that fetches access tokens from
+// Google Compute Engine (GCE)'s metadata server. It is only valid to use this
+// if your program is running on a GCE instance.
+// TODO(dsymonds): Deprecate and remove this.
+func NewComputeEngine() credentials.PerRPCCredentials {
+	return TokenSource{google.ComputeTokenSource("")}
+}
+
+// serviceAccount represents PerRPCCredentials via JWT signing key.
+type serviceAccount struct {
+	mu     sync.Mutex
+	config *jwt.Config
+	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": s.t.Type() + " " + s.t.AccessToken,
+	}, nil
+}
+
+func (s *serviceAccount) RequireTransportSecurity() bool {
+	return true
+}
+
+// NewServiceAccountFromKey constructs the PerRPCCredentials using the JSON key slice
+// from a Google Developers service account.
+func NewServiceAccountFromKey(jsonKey []byte, scope ...string) (credentials.PerRPCCredentials, error) {
+	config, err := google.JWTConfigFromJSON(jsonKey, scope...)
+	if err != nil {
+		return nil, err
+	}
+	return &serviceAccount{config: config}, nil
+}
+
+// NewServiceAccountFromFile constructs the PerRPCCredentials using the JSON key file
+// of a Google Developers service account.
+func NewServiceAccountFromFile(keyFile string, scope ...string) (credentials.PerRPCCredentials, error) {
+	jsonKey, err := ioutil.ReadFile(keyFile)
+	if err != nil {
+		return nil, fmt.Errorf("credentials: failed to read the service account key file: %v", err)
+	}
+	return NewServiceAccountFromKey(jsonKey, scope...)
+}
+
+// NewApplicationDefault returns "Application Default Credentials". For more
+// detail, see https://developers.google.com/accounts/docs/application-default-credentials.
+func NewApplicationDefault(ctx context.Context, scope ...string) (credentials.PerRPCCredentials, error) {
+	t, err := google.DefaultTokenSource(ctx, scope...)
+	if err != nil {
+		return nil, err
+	}
+	return TokenSource{t}, nil
+}