chore: update samples for new auth

auth/access_token_from_impersonated_credentials.go

@@ -21,51 +21,53 @@ import (
 	"io"
 	"time"
 
-	"golang.org/x/oauth2/google"
-	"google.golang.org/api/impersonate"
-	"google.golang.org/api/option"
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/credentials/impersonate"
 )
 
 // getAccessTokenFromImpersonatedCredentials uses a service account (SA1) to impersonate
-// another service account (SA2) and obtain OAuth2 token for the impersonated account.
+// another service account (SA2) and obtain a token for the impersonated account.
 // To obtain a token for SA2, SA1 should have the "roles/iam.serviceAccountTokenCreator" permission on SA2.
 func getAccessTokenFromImpersonatedCredentials(w io.Writer, impersonatedServiceAccount, scope string) error {
 	// impersonatedServiceAccount := "[email protected]"
 	// scope := "https://www.googleapis.com/auth/cloud-platform"
 
 	ctx := context.Background()
 
-	// Construct the GoogleCredentials object which obtains the default configuration from your
-	// working environment.
-	credentials, err := google.FindDefaultCredentials(ctx, scope)
+	// Construct the Credentials object which obtains the default configuration
+	// from your working environment.
+	creds, err := credentials.DetectDefault(&credentials.DetectOptions{
+		Scopes: []string{scope},
+	})
 	if err != nil {
 		fmt.Fprintf(w, "failed to generate default credentials: %v", err)
 		return fmt.Errorf("failed to generate default credentials: %w", err)
 	}
 
-	ts, err := impersonate.CredentialsTokenSource(ctx, impersonate.CredentialsConfig{
+	impCreds, err := impersonate.NewCredentials(&impersonate.CredentialsOptions{
 		TargetPrincipal: impersonatedServiceAccount,
 		Scopes:          []string{scope},
 		Lifetime:        300 * time.Second,
 		// delegates: The chained list of delegates required to grant the final accessToken.
 		// For more information, see:
 		// https://cloud.google.com/iam/docs/create-short-lived-credentials-direct#sa-credentials-permissions
 		// Delegates is NOT USED here.
-		Delegates: []string{},
-	}, option.WithCredentials(credentials))
+		Delegates:   []string{},
+		Credentials: creds,
+	})
 	if err != nil {
-		fmt.Fprintf(w, "CredentialsTokenSource error: %v", err)
-		return fmt.Errorf("CredentialsTokenSource error: %w", err)
+		fmt.Fprintf(w, "NewCredentials error: %v", err)
+		return fmt.Errorf("NewCredentials error: %w", err)
 	}
 
-	// Get the OAuth2 token.
-	// Once you've obtained the OAuth2 token, you can use it to make an authenticated call.
-	t, err := ts.Token()
+	// Get the token. Once you've obtained the token, you can use it to make a
+	// authenticated call.
+	t, err := impCreds.Token(ctx)
 	if err != nil {
 		fmt.Fprintf(w, "failed to receive token: %v", err)
 		return fmt.Errorf("failed to receive token: %w", err)
 	}
-	fmt.Fprintf(w, "Generated OAuth2 token with length %d.\n", len(t.AccessToken))
+	fmt.Fprintf(w, "Generated OAuth2 token with length %d.\n", len(t.Value))
 
 	return nil
 }

auth/auth_test.go

@@ -22,8 +22,8 @@ import (
 	"strings"
 	"testing"
 
+	"cloud.google.com/go/auth/credentials"
 	"github.com/GoogleCloudPlatform/golang-samples/internal/testutil"
-	"golang.org/x/oauth2/google"
 	"google.golang.org/api/idtoken"
 	"google.golang.org/api/option"
 )
@@ -87,12 +87,12 @@ func TestAuthSnippets(t *testing.T) {
 	buf.Reset()
 	want = "ID token verified."
 
-	credentials, err := google.FindDefaultCredentials(ctx)
+	credentials, err := credentials.DetectDefault(nil)
 	if err != nil {
 		t.Fatalf("failed to generate default credentials: %v", err)
 	}
 
-	ts, err := idtoken.NewTokenSource(ctx, audience, option.WithCredentials(credentials))
+	ts, err := idtoken.NewTokenSource(ctx, audience, option.WithAuthCredentials(credentials))
 	if err != nil {
 		t.Fatalf("failed to create NewTokenSource: %v", err)
 	}

auth/authenticate_explicit_with_adc.go

@@ -20,8 +20,8 @@ import (
 	"fmt"
 	"io"
 
+	"cloud.google.com/go/auth/credentials"
 	"cloud.google.com/go/storage"
-	"golang.org/x/oauth2/google"
 	"google.golang.org/api/iterator"
 	"google.golang.org/api/option"
 )
@@ -31,28 +31,33 @@ import (
 func authenticateExplicitWithAdc(w io.Writer) error {
 	ctx := context.Background()
 
-	// Construct the Google credentials object which obtains the default configuration from your
+	// Construct Credentials which obtains the default configuration from your
 	// working environment.
-	// google.FindDefaultCredentials() will give you ComputeEngineCredentials
-	// if you are on a GCE (or other metadata server supported environments).
-	credentials, err := google.FindDefaultCredentials(ctx, "https://www.googleapis.com/auth/cloud-platform")
+	credentials, err := credentials.DetectDefault(&credentials.DetectOptions{
+		Scopes: []string{"https://www.googleapis.com/auth/cloud-platform"},
+	})
 	if err != nil {
 		return fmt.Errorf("failed to generate default credentials: %w", err)
 	}
-	// If you are authenticating to a Cloud API, you can let the library include the default scope,
-	// https://www.googleapis.com/auth/cloud-platform, because IAM is used to provide fine-grained
-	// permissions for Cloud.
-	// For more information on scopes to use,
-	// see: https://developers.google.com/identity/protocols/oauth2/scopes
+	// If you are authenticating to a Cloud API, you can let the library include
+	// the default scope, https://www.googleapis.com/auth/cloud-platform,
+	// because IAM is used to provide fine-grained permissions for Cloud. For
+	// more information on scopes to use, see:
+	// https://developers.google.com/identity/protocols/oauth2/scopes
 
 	// Construct the Storage client.
-	client, err := storage.NewClient(ctx, option.WithCredentials(credentials))
+	client, err := storage.NewClient(ctx, option.WithAuthCredentials(credentials))
 	if err != nil {
 		return fmt.Errorf("NewClient: %w", err)
 	}
 	defer client.Close()
 
-	it := client.Buckets(ctx, credentials.ProjectID)
+	projID, err := credentials.ProjectID(ctx)
+	if err != nil {
+		return fmt.Errorf("ProjectID: %w", err)
+	}
+
+	it := client.Buckets(ctx, projID)
 	for {
 		bucketAttrs, err := it.Next()
 		if err == iterator.Done {

auth/downscoping/credential_initialization.go

@@ -20,31 +20,35 @@ package downscopedoverview
 // [START auth_downscoping_initialize_downscoped_cred]
 
 import (
-	"context"
 	"fmt"
 
-	"golang.org/x/oauth2/google"
-	"golang.org/x/oauth2/google/downscope"
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/credentials/downscope"
 )
 
-// initializeCredentials will generate a downscoped token using the provided Access Boundary Rules.
+// initializeCredentials will generate a downscoped token using the provided
+// Access Boundary Rules.
 func initializeCredentials(accessBoundary []downscope.AccessBoundaryRule) error {
-	ctx := context.Background()
-
-	// You must provide the "https://www.googleapis.com/auth/cloud-platform" scope.
-	// This Source can be initialized in multiple ways; the following example uses
-	// Application Default Credentials.
-	rootSource, err := google.DefaultTokenSource(ctx, "https://www.googleapis.com/auth/cloud-platform")
+	// You must provide the "https://www.googleapis.com/auth/cloud-platform"
+	// scope. This credential can be initialized in multiple ways; the following
+	// example uses Application Default Credentials.
+	rootCreds, err := credentials.DetectDefault(&credentials.DetectOptions{
+		Scopes: []string{"https://www.googleapis.com/auth/cloud-platform"},
+	})
 	if err != nil {
-		return fmt.Errorf("failed to generate rootSource: %w", err)
+		return fmt.Errorf("failed to generate rootCreds: %w", err)
 	}
 
-	// downscope.NewTokenSource constructs the token source with the configuration provided.
-	dts, err := downscope.NewTokenSource(ctx, downscope.DownscopingConfig{RootSource: rootSource, Rules: accessBoundary})
+	// downscope.NewCredentials constructs the credentials with the
+	// configuration provided.
+	downscopedCreds, err := downscope.NewCredentials(&downscope.Options{
+		Credentials: rootCreds,
+		Rules:       accessBoundary,
+	})
 	if err != nil {
-		return fmt.Errorf("failed to generate downscoped token source: %w", err)
+		return fmt.Errorf("failed to generate downscoped credentials: %w", err)
 	}
-	_ = dts
+	_ = downscopedCreds
 	// You can now use dts to access Google Storage resources.
 	return nil
 }

auth/downscoping/downscoped_test.go

@@ -22,10 +22,10 @@ import (
 	"testing"
 	"time"
 
+	"cloud.google.com/go/auth/credentials/downscope"
 	"cloud.google.com/go/storage"
 	"github.com/GoogleCloudPlatform/golang-samples/internal/testutil"
 	"github.com/google/uuid"
-	"golang.org/x/oauth2/google/downscope"
 )
 
 func TestInitializeCredentials(t *testing.T) {

auth/downscoping/initialize_CAB.go

@@ -16,9 +16,10 @@ package downscopedoverview
 
 // [START auth_downscoping_rules]
 
-import "golang.org/x/oauth2/google/downscope"
+import "cloud.google.com/go/auth/credentials/downscope"
 
-// constructCAB shows how to initialize a Credential Access Boundary for downscoping tokens.
+// constructCAB shows how to initialize a Credential Access Boundary for
+// downscoped tokens.
 func constructCAB(bucketName string, prefix string) {
 	// bucketName := "foo"
 	// prefix := "profile-picture-"

auth/downscoping/token_broker.go

@@ -20,14 +20,14 @@ import (
 	"context"
 	"fmt"
 
-	"golang.org/x/oauth2"
-	"golang.org/x/oauth2/google"
-	"golang.org/x/oauth2/google/downscope"
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/credentials/downscope"
 )
 
 // createDownscopedToken would be run on the token broker in order to generate
-// a downscoped access token that only grants access to objects whose name begins with prefix.
-// The token broker would then pass the newly created token to the requesting token consumer for use.
+// a downscoped access token that only grants access to objects whose name
+// begins with prefix. The token broker would then pass the newly created token
+// to the requesting token consumer for use.
 func createDownscopedToken(bucketName string, prefix string) error {
 	// bucketName := "foo"
 	// prefix := "profile-picture-"
@@ -50,23 +50,29 @@ func createDownscopedToken(bucketName string, prefix string) error {
 		},
 	}
 
-	// This Source can be initialized in multiple ways; the following example uses
-	// Application Default Credentials.
-	var rootSource oauth2.TokenSource
-
-	// You must provide the "https://www.googleapis.com/auth/cloud-platform" scope.
-	rootSource, err := google.DefaultTokenSource(ctx, "https://www.googleapis.com/auth/cloud-platform")
+	// This credential can be initialized in multiple ways; the following example
+	// uses Application Default Credentials. You must provide the
+	// "https://www.googleapis.com/auth/cloud-platform" scope.
+	creds, err := credentials.DetectDefault(&credentials.DetectOptions{
+		Scopes: []string{
+			"https://www.googleapis.com/auth/cloud-platform",
+		},
+	})
 	if err != nil {
-		return fmt.Errorf("failed to generate rootSource: %w", err)
+		return fmt.Errorf("failed to generate creds: %w", err)
 	}
 
-	// downscope.NewTokenSource constructs the token source with the configuration provided.
-	dts, err := downscope.NewTokenSource(ctx, downscope.DownscopingConfig{RootSource: rootSource, Rules: accessBoundary})
+	// downscope.NewCredentials constructs the credential with the configuration
+	// provided.
+	downscopedCreds, err := downscope.NewCredentials(&downscope.Options{
+		Credentials: creds,
+		Rules:       accessBoundary,
+	})
 	if err != nil {
-		return fmt.Errorf("failed to generate downscoped token source: %w", err)
+		return fmt.Errorf("failed to generate downscoped credentials: %w", err)
 	}
-	// Token() uses the previously declared TokenSource to generate a downscoped token.
-	tok, err := dts.Token()
+	// Token uses the previously declared Credentials to generate a downscoped token.
+	tok, err := downscopedCreds.Token(ctx)
 	if err != nil {
 		return fmt.Errorf("failed to generate token: %w", err)
 	}

auth/downscoping/token_consumer.go

@@ -22,44 +22,48 @@ import (
 	"io"
 	"io/ioutil"
 
-	"golang.org/x/oauth2/google"
-	"golang.org/x/oauth2/google/downscope"
+	"cloud.google.com/go/auth"
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/credentials/downscope"
 
 	"cloud.google.com/go/storage"
-	"golang.org/x/oauth2"
 	"google.golang.org/api/option"
 )
 
-// A token consumer should define their own tokenSource. In the Token() method,
-// it should send a query to a token broker requesting a downscoped token.
-// The token broker holds the root credential that is used to generate the
-// downscoped token.
-type localTokenSource struct {
-	ctx        context.Context
+// A token consumer should define their own auth.Credentials . In the `Token`
+// method, it should send a query to a token broker requesting a downscoped
+// token. The token broker holds the root credential that is used to generate
+// the downscoped token.
+type localTokenProvider struct {
 	bucketName string
 	brokerURL  string
 }
 
-func (lts localTokenSource) Token() (*oauth2.Token, error) {
-	var remoteToken *oauth2.Token
-	// Usually you would now retrieve remoteToken, an oauth2.Token, from token broker.
-	// This snippet performs the same functionality locally.
+func (lts localTokenProvider) Token(ctx context.Context) (*auth.Token, error) {
+	var remoteToken *auth.Token
+	// Usually you would now retrieve remoteToken, an auth.Token, from token
+	// broker. This snippet performs the same functionality locally.
 	accessBoundary := []downscope.AccessBoundaryRule{
 		{
 			AvailableResource:    "//storage.googleapis.com/projects/_/buckets/" + lts.bucketName,
 			AvailablePermissions: []string{"inRole:roles/storage.objectViewer"},
 		},
 	}
-	rootSource, err := google.DefaultTokenSource(lts.ctx, "https://www.googleapis.com/auth/cloud-platform")
+	creds, err := credentials.DetectDefault(&credentials.DetectOptions{
+		Scopes: []string{"https://www.googleapis.com/auth/cloud-platform"},
+	})
 	if err != nil {
-		return nil, fmt.Errorf("failed to generate rootSource: %w", err)
+		return nil, fmt.Errorf("failed to generate creds: %w", err)
 	}
-	dts, err := downscope.NewTokenSource(lts.ctx, downscope.DownscopingConfig{RootSource: rootSource, Rules: accessBoundary})
+	downscopedCreds, err := downscope.NewCredentials(&downscope.Options{
+		Credentials: creds,
+		Rules:       accessBoundary,
+	})
 	if err != nil {
-		return nil, fmt.Errorf("failed to generate downscoped token source: %w", err)
+		return nil, fmt.Errorf("failed to generate downscoped credentials: %w", err)
 	}
-	// Token() uses the previously declared TokenSource to generate a downscoped token.
-	remoteToken, err = dts.Token()
+	// Token uses the previously declared Credentials to generate a downscoped token.
+	remoteToken, err = downscopedCreds.Token(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("failed to generate token: %w", err)
 	}
@@ -75,16 +79,17 @@ func getObjectContents(output io.Writer, bucketName string, objectName string) e
 
 	ctx := context.Background()
 
-	thisTokenSource := localTokenSource{
-		ctx:        ctx,
+	tokenProvider := localTokenProvider{
 		bucketName: bucketName,
 		brokerURL:  "yourURL.com/internal/broker",
 	}
 
-	// Wrap the TokenSource in an oauth2.ReuseTokenSource to enable automatic refreshing.
-	refreshableTS := oauth2.ReuseTokenSource(nil, thisTokenSource)
 	// You can now use the token source to access Google Cloud Storage resources as follows.
-	storageClient, err := storage.NewClient(ctx, option.WithTokenSource(refreshableTS))
+	storageClient, err := storage.NewClient(ctx, option.WithAuthCredentials(
+		auth.NewCredentials(&auth.CredentialsOptions{
+			TokenProvider: auth.NewCachedTokenProvider(tokenProvider, nil),
+		}),
+	))
 	if err != nil {
 		return fmt.Errorf("failed to create the storage client: %w", err)
 	}