feat(OP): add back channel logout support (#671)

* feat: add configuration support for back channel logout

* logout token

* indicate back channel logout support in discovery endpoint

pkg/op/config.go

@@ -49,6 +49,9 @@ type Configuration interface {
 
 	SupportedUILocales() []language.Tag
 	DeviceAuthorization() DeviceAuthorizationConfig
+
+	BackChannelLogoutSupported() bool
+	BackChannelLogoutSessionSupported() bool
 }
 
 type IssuerFromRequest func(r *http.Request) string

pkg/op/discovery.go

@@ -61,6 +61,8 @@ func CreateDiscoveryConfig(ctx context.Context, config Configuration, storage Di
 		CodeChallengeMethodsSupported:                      CodeChallengeMethods(config),
 		UILocalesSupported:                                 config.SupportedUILocales(),
 		RequestParameterSupported:                          config.RequestObjectSupported(),
+		BackChannelLogoutSupported:                         config.BackChannelLogoutSupported(),
+		BackChannelLogoutSessionSupported:                  config.BackChannelLogoutSessionSupported(),
 	}
 }
 
@@ -92,6 +94,8 @@ func createDiscoveryConfigV2(ctx context.Context, config Configuration, storage
 		CodeChallengeMethodsSupported:                      CodeChallengeMethods(config),
 		UILocalesSupported:                                 config.SupportedUILocales(),
 		RequestParameterSupported:                          config.RequestObjectSupported(),
+		BackChannelLogoutSupported:                         config.BackChannelLogoutSupported(),
+		BackChannelLogoutSessionSupported:                  config.BackChannelLogoutSessionSupported(),
 	}
 }
 

pkg/op/mock/configuration.mock.go

@@ -78,6 +78,34 @@ func (mr *MockConfigurationMockRecorder) AuthorizationEndpoint() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AuthorizationEndpoint", reflect.TypeOf((*MockConfiguration)(nil).AuthorizationEndpoint))
 }
 
+// BackChannelLogoutSessionSupported mocks base method.
+func (m *MockConfiguration) BackChannelLogoutSessionSupported() bool {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "BackChannelLogoutSessionSupported")
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// BackChannelLogoutSessionSupported indicates an expected call of BackChannelLogoutSessionSupported.
+func (mr *MockConfigurationMockRecorder) BackChannelLogoutSessionSupported() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "BackChannelLogoutSessionSupported", reflect.TypeOf((*MockConfiguration)(nil).BackChannelLogoutSessionSupported))
+}
+
+// BackChannelLogoutSupported mocks base method.
+func (m *MockConfiguration) BackChannelLogoutSupported() bool {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "BackChannelLogoutSupported")
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// BackChannelLogoutSupported indicates an expected call of BackChannelLogoutSupported.
+func (mr *MockConfigurationMockRecorder) BackChannelLogoutSupported() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "BackChannelLogoutSupported", reflect.TypeOf((*MockConfiguration)(nil).BackChannelLogoutSupported))
+}
+
 // CodeMethodS256Supported mocks base method.
 func (m *MockConfiguration) CodeMethodS256Supported() bool {
 	m.ctrl.T.Helper()

pkg/op/op.go

@@ -158,16 +158,18 @@ func authCallbackPath(o OpenIDProvider) string {
 }
 
 type Config struct {
-	CryptoKey                [32]byte
-	DefaultLogoutRedirectURI string
-	CodeMethodS256           bool
-	AuthMethodPost           bool
-	AuthMethodPrivateKeyJWT  bool
-	GrantTypeRefreshToken    bool
-	RequestObjectSupported   bool
-	SupportedUILocales       []language.Tag
-	SupportedClaims          []string
-	DeviceAuthorization      DeviceAuthorizationConfig
+	CryptoKey                         [32]byte
+	DefaultLogoutRedirectURI          string
+	CodeMethodS256                    bool
+	AuthMethodPost                    bool
+	AuthMethodPrivateKeyJWT           bool
+	GrantTypeRefreshToken             bool
+	RequestObjectSupported            bool
+	SupportedUILocales                []language.Tag
+	SupportedClaims                   []string
+	DeviceAuthorization               DeviceAuthorizationConfig
+	BackChannelLogoutSupported        bool
+	BackChannelLogoutSessionSupported bool
 }
 
 // Endpoints defines endpoint routes.
@@ -411,6 +413,14 @@ func (o *Provider) DeviceAuthorization() DeviceAuthorizationConfig {
 	return o.config.DeviceAuthorization
 }
 
+func (o *Provider) BackChannelLogoutSupported() bool {
+	return o.config.BackChannelLogoutSupported
+}
+
+func (o *Provider) BackChannelLogoutSessionSupported() bool {
+	return o.config.BackChannelLogoutSessionSupported
+}
+
 func (o *Provider) Storage() Storage {
 	return o.storage
 }