--- /dev/null
+/*
+ *
+ * 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
+}
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