1 files changed, 25 insertions, 0 deletions
diff --git a/vendor/google.golang.org/api/internal/settings.go b/vendor/google.golang.org/api/internal/settings.go
index 5147191..34dfa5a 100644
--- a/vendor/google.golang.org/api/internal/settings.go
+++ b/vendor/google.golang.org/api/internal/settings.go
@@ -16,9 +16,11 @@
 package internal
 
 import (
+	"errors"
 	"net/http"
 
 	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
 	"google.golang.org/grpc"
 )
 
@@ -28,10 +30,33 @@ type DialSettings struct {
 	Endpoint        string
 	Scopes          []string
 	TokenSource     oauth2.TokenSource
+	Credentials     *google.DefaultCredentials
 	CredentialsFile string // if set, Token Source is ignored.
 	UserAgent       string
 	APIKey          string
 	HTTPClient      *http.Client
 	GRPCDialOpts    []grpc.DialOption
 	GRPCConn        *grpc.ClientConn
+	NoAuth          bool
+}
+
+// Validate reports an error if ds is invalid.
+func (ds *DialSettings) Validate() error {
+	hasCreds := ds.APIKey != "" || ds.TokenSource != nil || ds.CredentialsFile != "" || ds.Credentials != nil
+	if ds.NoAuth && hasCreds {
+		return errors.New("options.WithoutAuthentication is incompatible with any option that provides credentials")
+	}
+	// Credentials should not appear with other options.
+	// We currently allow TokenSource and CredentialsFile to coexist.
+	// TODO(jba): make TokenSource & CredentialsFile an error (breaking change).
+	if ds.Credentials != nil && (ds.APIKey != "" || ds.TokenSource != nil || ds.CredentialsFile != "") {
+		return errors.New("multiple credential options provided")
+	}
+	if ds.HTTPClient != nil && ds.GRPCConn != nil {
+		return errors.New("WithHTTPClient is incompatible with WithGRPCConn")
+	}
+	if ds.HTTPClient != nil && ds.GRPCDialOpts != nil {
+		return errors.New("WithHTTPClient is incompatible with gRPC dial options")
+	}
+	return nil
 }