vendor: update all dependencies

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

@@ -73,7 +73,6 @@ func DefaultTokenSource(ctx context.Context, scope ...string) (oauth2.TokenSourc
 //   4. On Google Compute Engine, Google App Engine standard second generation runtimes
 //      (>= Go 1.11), and Google App Engine flexible environment, it fetches
 //      credentials from the metadata server.
-//      (In this final case any provided scopes are ignored.)
 func FindDefaultCredentials(ctx context.Context, scopes ...string) (*Credentials, error) {
 	// First, try the environment variable.
 	const envVar = "GOOGLE_APPLICATION_CREDENTIALS"
@@ -109,7 +108,7 @@ func FindDefaultCredentials(ctx context.Context, scopes ...string) (*Credentials
 		id, _ := metadata.ProjectID()
 		return &DefaultCredentials{
 			ProjectID:   id,
-			TokenSource: ComputeTokenSource(""),
+			TokenSource: ComputeTokenSource("", scopes...),
 		}, nil
 	}
 

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

@@ -9,6 +9,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"net/url"
 	"strings"
 	"time"
 
@@ -19,12 +20,13 @@ import (
 
 // Endpoint is Google's OAuth 2.0 endpoint.
 var Endpoint = oauth2.Endpoint{
-	AuthURL:  "https://accounts.google.com/o/oauth2/auth",
-	TokenURL: "https://accounts.google.com/o/oauth2/token",
+	AuthURL:   "https://accounts.google.com/o/oauth2/auth",
+	TokenURL:  "https://oauth2.googleapis.com/token",
+	AuthStyle: oauth2.AuthStyleInParams,
 }
 
 // JWTTokenURL is Google's OAuth 2.0 token URL to use with the JWT flow.
-const JWTTokenURL = "https://accounts.google.com/o/oauth2/token"
+const JWTTokenURL = "https://oauth2.googleapis.com/token"
 
 // ConfigFromJSON uses a Google Developers Console client_credentials.json
 // file to construct a config.
@@ -150,14 +152,16 @@ func (f *credentialsFile) tokenSource(ctx context.Context, scopes []string) (oau
 // from Google Compute Engine (GCE)'s metadata server. It's only valid to use
 // this token source if your program is running on a GCE instance.
 // If no account is specified, "default" is used.
+// If no scopes are specified, a set of default scopes are automatically granted.
 // Further information about retrieving access tokens from the GCE metadata
 // server can be found at https://cloud.google.com/compute/docs/authentication.
-func ComputeTokenSource(account string) oauth2.TokenSource {
-	return oauth2.ReuseTokenSource(nil, computeSource{account: account})
+func ComputeTokenSource(account string, scope ...string) oauth2.TokenSource {
+	return oauth2.ReuseTokenSource(nil, computeSource{account: account, scopes: scope})
 }
 
 type computeSource struct {
 	account string
+	scopes  []string
 }
 
 func (cs computeSource) Token() (*oauth2.Token, error) {
@@ -168,7 +172,13 @@ func (cs computeSource) Token() (*oauth2.Token, error) {
 	if acct == "" {
 		acct = "default"
 	}
-	tokenJSON, err := metadata.Get("instance/service-accounts/" + acct + "/token")
+	tokenURI := "instance/service-accounts/" + acct + "/token"
+	if len(cs.scopes) > 0 {
+		v := url.Values{}
+		v.Set("scopes", strings.Join(cs.scopes, ","))
+		tokenURI = tokenURI + "?" + v.Encode()
+	}
+	tokenJSON, err := metadata.Get(tokenURI)
 	if err != nil {
 		return nil, err
 	}