feat: add verifiable credentials handler

compose/compose_userinfo_vc.go

@@ -0,0 +1,18 @@
+// Copyright © 2023 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package compose
+
+import (
+	"github.com/ory/fosite"
+	"github.com/ory/fosite/handler/verifiable"
+)
+
+// OIDCUserinfoVerifiableCredentialFactory creates a verifiable credentials
+// handler.
+func OIDCUserinfoVerifiableCredentialFactory(config fosite.Configurator, storage, strategy any) any {
+	return &verifiable.Handler{
+		NonceManager: storage.(verifiable.NonceManager),
+		Config:       config,
+	}
+}

config.go

@@ -34,6 +34,12 @@ type AccessTokenLifespanProvider interface {
 	GetAccessTokenLifespan(ctx context.Context) time.Duration
 }
 
+// VerifiableCredentialsNonceLifespanProvider returns the provider for configuring the access token lifespan.
+type VerifiableCredentialsNonceLifespanProvider interface {
+	// GetNonceLifespan returns the nonce lifespan.
+	GetVerifiableCredentialsNonceLifespan(ctx context.Context) time.Duration
+}
+
 // IDTokenLifespanProvider returns the provider for configuring the ID token lifespan.
 type IDTokenLifespanProvider interface {
 	// GetIDTokenLifespan returns the ID token lifespan.

config_default.go

@@ -68,6 +68,9 @@ type Config struct {
 	// AccessTokenLifespan sets how long an access token is going to be valid. Defaults to one hour.
 	AccessTokenLifespan time.Duration
 
+	// VerifiableCredentialsNonceLifespan sets how long a verifiable credentials nonce is going to be valid. Defaults to one hour.
+	VerifiableCredentialsNonceLifespan time.Duration
+
 	// RefreshTokenLifespan sets how long a refresh token is going to be valid. Defaults to 30 days. Set to -1 for
 	// refresh tokens that never expire.
 	RefreshTokenLifespan time.Duration
@@ -360,7 +363,7 @@ func (c *Config) GetAuthorizeCodeLifespan(_ context.Context) time.Duration {
 	return c.AuthorizeCodeLifespan
 }
 
-// GeIDTokenLifespan returns how long an id token should be valid. Defaults to one hour.
+// GetIDTokenLifespan returns how long an id token should be valid. Defaults to one hour.
 func (c *Config) GetIDTokenLifespan(_ context.Context) time.Duration {
 	if c.IDTokenLifespan == 0 {
 		return time.Hour
@@ -376,6 +379,14 @@ func (c *Config) GetAccessTokenLifespan(_ context.Context) time.Duration {
 	return c.AccessTokenLifespan
 }
 
+// GetNonceLifespan returns how long a nonce should be valid. Defaults to one hour.
+func (c *Config) GetVerifiableCredentialsNonceLifespan(_ context.Context) time.Duration {
+	if c.VerifiableCredentialsNonceLifespan == 0 {
+		return time.Hour
+	}
+	return c.VerifiableCredentialsNonceLifespan
+}
+
 // GetRefreshTokenLifespan sets how long a refresh token is going to be valid. Defaults to 30 days. Set to -1 for
 // refresh tokens that never expire.
 func (c *Config) GetRefreshTokenLifespan(_ context.Context) time.Duration {
@@ -385,7 +396,7 @@ func (c *Config) GetRefreshTokenLifespan(_ context.Context) time.Duration {
 	return c.RefreshTokenLifespan
 }
 
-// GetHashCost returns the bcrypt cost factor. Defaults to 12.
+// GetBCryptCost returns the bcrypt cost factor. Defaults to 12.
 func (c *Config) GetBCryptCost(_ context.Context) int {
 	if c.HashCost == 0 {
 		return DefaultBCryptWorkFactor

fosite.go

@@ -106,6 +106,7 @@ type Configurator interface {
 	RefreshTokenScopesProvider
 	AccessTokenLifespanProvider
 	RefreshTokenLifespanProvider
+	VerifiableCredentialsNonceLifespanProvider
 	AuthorizeCodeLifespanProvider
 	TokenEntropyProvider
 	RotatedGlobalSecretsProvider

go.mod

@@ -71,4 +71,4 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
-go 1.17
+go 1.20

handler/verifiable/handler.go

@@ -0,0 +1,69 @@
+// Copyright © 2023 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package verifiable
+
+import (
+	"context"
+	"time"
+
+	"github.com/ory/fosite"
+	"github.com/ory/x/errorsx"
+)
+
+const (
+	draftScope         = "userinfo_credential_draft_00"
+	draftNonceField    = "c_nonce_draft_00"
+	draftNonceExpField = "c_nonce_expires_in_draft_00"
+)
+
+type Handler struct {
+	Config interface {
+		fosite.VerifiableCredentialsNonceLifespanProvider
+	}
+	NonceManager
+}
+
+var _ fosite.TokenEndpointHandler = (*Handler)(nil)
+
+func (c *Handler) HandleTokenEndpointRequest(ctx context.Context, request fosite.AccessRequester) error {
+	if !c.CanHandleTokenEndpointRequest(ctx, request) {
+		return errorsx.WithStack(fosite.ErrUnknownRequest)
+	}
+
+	if !request.GetGrantedScopes().Has("openid") {
+		return errorsx.WithStack(fosite.ErrUnknownRequest)
+	}
+
+	return nil
+}
+
+func (c *Handler) PopulateTokenEndpointResponse(
+	ctx context.Context,
+	request fosite.AccessRequester,
+	response fosite.AccessResponder,
+) error {
+	if !c.CanHandleTokenEndpointRequest(ctx, request) {
+		return errorsx.WithStack(fosite.ErrUnknownRequest)
+	}
+
+	lifespan := c.Config.GetVerifiableCredentialsNonceLifespan(ctx)
+	expiry := time.Now().UTC().Add(lifespan)
+	nonce, err := c.NewNonce(ctx, response.GetAccessToken(), expiry)
+	if err != nil {
+		return err
+	}
+
+	response.SetExtra(draftNonceField, nonce)
+	response.SetExtra(draftNonceExpField, int64(lifespan.Seconds()))
+
+	return nil
+}
+
+func (c *Handler) CanSkipClientAuth(context.Context, fosite.AccessRequester) bool {
+	return false
+}
+
+func (c *Handler) CanHandleTokenEndpointRequest(_ context.Context, requester fosite.AccessRequester) bool {
+	return requester.GetGrantedScopes().Has(draftScope)
+}

handler/verifiable/handler_test.go

@@ -0,0 +1,73 @@
+// Copyright © 2023 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package verifiable
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/ory/fosite"
+	"github.com/ory/fosite/internal"
+)
+
+type mockNonceManager struct{ t *testing.T }
+
+func (m *mockNonceManager) NewNonce(ctx context.Context, accessToken string, expiresAt time.Time) (string, error) {
+	assert.Equal(m.t, "fake access token", accessToken)
+	assert.WithinDuration(m.t, time.Now().Add(time.Hour), expiresAt, 5*time.Second)
+	return "mocked nonce", nil
+}
+
+func (m *mockNonceManager) IsNonceValid(context.Context, string, string) error {
+	return nil
+}
+
+func TestHandler(t *testing.T) {
+	t.Parallel()
+	ctx := context.Background()
+
+	t.Run("case=correct scopes", func(t *testing.T) {
+		t.Parallel()
+		handler := newHandler(t)
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		req := internal.NewMockAccessRequester(ctrl)
+		req.EXPECT().GetGrantedScopes().Return(fosite.Arguments{"openid", draftScope}).AnyTimes()
+
+		resp := internal.NewMockAccessResponder(ctrl)
+		resp.EXPECT().GetAccessToken().Return("fake access token")
+		resp.EXPECT().SetExtra(gomock.Eq(draftNonceField), gomock.Eq("mocked nonce"))
+		resp.EXPECT().SetExtra(gomock.Eq(draftNonceExpField), gomock.Any())
+
+		assert.NoError(t, handler.HandleTokenEndpointRequest(ctx, req))
+		assert.NoError(t, handler.PopulateTokenEndpointResponse(ctx, req, resp))
+	})
+
+	t.Run("case=incorrect scopes", func(t *testing.T) {
+		t.Parallel()
+		handler := newHandler(t)
+		ctrl := gomock.NewController(t)
+		defer ctrl.Finish()
+
+		req := internal.NewMockAccessRequester(ctrl)
+		req.EXPECT().GetGrantedScopes().Return(fosite.Arguments{"openid"}).AnyTimes()
+
+		resp := internal.NewMockAccessResponder(ctrl)
+
+		assert.ErrorIs(t, handler.HandleTokenEndpointRequest(ctx, req), fosite.ErrUnknownRequest)
+		assert.ErrorIs(t, handler.PopulateTokenEndpointResponse(ctx, req, resp), fosite.ErrUnknownRequest)
+	})
+}
+
+func newHandler(t *testing.T) *Handler {
+	return &Handler{
+		Config:       new(fosite.Config),
+		NonceManager: &mockNonceManager{t: t},
+	}
+}

handler/verifiable/nonce.go

@@ -0,0 +1,17 @@
+// Copyright © 2023 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package verifiable
+
+import (
+	"context"
+	"time"
+)
+
+type NonceManager interface {
+	// NewNonce creates a new nonce bound to the access token valid until the given expiry time.
+	NewNonce(ctx context.Context, accessToken string, expiresAt time.Time) (string, error)
+
+	// IsNonceValid checks if the given nonce is valid for the given access token and not expired.
+	IsNonceValid(ctx context.Context, accessToken string, nonce string) error
+}