Use to the stable version of Lego

vendor/golang.org/x/oauth2/google/not_go19.go

@@ -0,0 +1,54 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !go1.9
+
+package google
+
+import (
+	"golang.org/x/net/context"
+	"golang.org/x/oauth2"
+)
+
+// DefaultCredentials holds Google credentials, including "Application Default Credentials".
+// For more details, see:
+// https://developers.google.com/accounts/docs/application-default-credentials
+type DefaultCredentials struct {
+	ProjectID   string // may be empty
+	TokenSource oauth2.TokenSource
+
+	// JSON contains the raw bytes from a JSON credentials file.
+	// This field may be nil if authentication is provided by the
+	// environment and not with a credentials file, e.g. when code is
+	// running on Google Cloud Platform.
+	JSON []byte
+}
+
+// FindDefaultCredentials searches for "Application Default Credentials".
+//
+// It looks for credentials in the following places,
+// preferring the first location found:
+//
+//   1. A JSON file whose path is specified by the
+//      GOOGLE_APPLICATION_CREDENTIALS environment variable.
+//   2. A JSON file in a location known to the gcloud command-line tool.
+//      On Windows, this is %APPDATA%/gcloud/application_default_credentials.json.
+//      On other systems, $HOME/.config/gcloud/application_default_credentials.json.
+//   3. On Google App Engine it uses the appengine.AccessToken function.
+//   4. On Google Compute Engine and Google App Engine Managed VMs, it fetches
+//      credentials from the metadata server.
+//      (In this final case any provided scopes are ignored.)
+func FindDefaultCredentials(ctx context.Context, scopes ...string) (*DefaultCredentials, error) {
+	return findDefaultCredentials(ctx, scopes)
+}
+
+// CredentialsFromJSON obtains Google credentials from a JSON value. The JSON can
+// represent either a Google Developers Console client_credentials.json file (as in
+// ConfigFromJSON) or a Google Developers service account key file (as in
+// JWTConfigFromJSON).
+//
+// Note: despite the name, the returned credentials may not be Application Default Credentials.
+func CredentialsFromJSON(ctx context.Context, jsonData []byte, scopes ...string) (*DefaultCredentials, error) {
+	return credentialsFromJSON(ctx, jsonData, scopes)
+}