1 files changed, 104 insertions, 0 deletions
diff --git a/vendor/google.golang.org/api/internal/creds.go b/vendor/google.golang.org/api/internal/creds.go
new file mode 100644
index 0000000..b546b63
--- /dev/null
+++ b/vendor/google.golang.org/api/internal/creds.go
@@ -0,0 +1,104 @@
+// Copyright 2017 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 internal
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"time"
+
+	"golang.org/x/net/context"
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
+)
+
+// Creds returns credential information obtained from DialSettings, or if none, then
+// it returns default credential information.
+func Creds(ctx context.Context, ds *DialSettings) (*google.DefaultCredentials, error) {
+	if ds.CredentialsFile != "" {
+		return credFileTokenSource(ctx, ds.CredentialsFile, ds.Scopes...)
+	}
+	if ds.TokenSource != nil {
+		return &google.DefaultCredentials{TokenSource: ds.TokenSource}, nil
+	}
+	return google.FindDefaultCredentials(ctx, ds.Scopes...)
+}
+
+// credFileTokenSource reads a refresh token file or a service account and returns
+// a TokenSource constructed from the config.
+func credFileTokenSource(ctx context.Context, filename string, scope ...string) (*google.DefaultCredentials, error) {
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, fmt.Errorf("cannot read credentials file: %v", err)
+	}
+	// See if it is a refresh token credentials file first.
+	ts, ok, err := refreshTokenTokenSource(ctx, data, scope...)
+	if err != nil {
+		return nil, err
+	}
+	if ok {
+		return &google.DefaultCredentials{
+			TokenSource: ts,
+			JSON:        data,
+		}, nil
+	}
+
+	// If not, it should be a service account.
+	cfg, err := google.JWTConfigFromJSON(data, scope...)
+	if err != nil {
+		return nil, fmt.Errorf("google.JWTConfigFromJSON: %v", err)
+	}
+	// jwt.Config does not expose the project ID, so re-unmarshal to get it.
+	var pid struct {
+		ProjectID string `json:"project_id"`
+	}
+	if err := json.Unmarshal(data, &pid); err != nil {
+		return nil, err
+	}
+	return &google.DefaultCredentials{
+		ProjectID:   pid.ProjectID,
+		TokenSource: cfg.TokenSource(ctx),
+		JSON:        data,
+	}, nil
+}
+
+func refreshTokenTokenSource(ctx context.Context, data []byte, scope ...string) (oauth2.TokenSource, bool, error) {
+	var c cred
+	if err := json.Unmarshal(data, &c); err != nil {
+		return nil, false, fmt.Errorf("cannot unmarshal credentials file: %v", err)
+	}
+	if c.ClientID == "" || c.ClientSecret == "" || c.RefreshToken == "" || c.Type != "authorized_user" {
+		return nil, false, nil
+	}
+	cfg := &oauth2.Config{
+		ClientID:     c.ClientID,
+		ClientSecret: c.ClientSecret,
+		Endpoint:     google.Endpoint,
+		RedirectURL:  "urn:ietf:wg:oauth:2.0:oob",
+		Scopes:       scope,
+	}
+	return cfg.TokenSource(ctx, &oauth2.Token{
+		RefreshToken: c.RefreshToken,
+		Expiry:       time.Now(),
+	}), true, nil
+}
+
+type cred struct {
+	ClientID     string `json:"client_id"`
+	ClientSecret string `json:"client_secret"`
+	RefreshToken string `json:"refresh_token"`
+	Type         string `json:"type"`
+}