feat(auth): 实现 TOTP 双因素认证功能

新增功能：
- 支持 Google Authenticator 等应用进行 TOTP 二次验证
- 用户可在个人设置中启用/禁用 2FA
- 登录时支持 TOTP 验证流程
- 管理后台可全局开关 TOTP 功能

安全增强：
- TOTP 密钥使用 AES-256-GCM 加密存储
- 添加 TOTP_ENCRYPTION_KEY 配置项，必须手动配置才能启用功能
- 防止服务重启导致加密密钥变更使用户无法登录
- 验证失败次数限制，防止暴力破解

配置说明：
- Docker 部署：在 .env 中设置 TOTP_ENCRYPTION_KEY
- 非 Docker 部署：在 config.yaml 中设置 totp.encryption_key
- 生成密钥命令：openssl rand -hex 32

backend/cmd/server/wire_gen.go

@@ -63,7 +63,13 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	promoService := service.NewPromoService(promoCodeRepository, userRepository, billingCacheService, client, apiKeyAuthCacheInvalidator)
 	authService := service.NewAuthService(userRepository, configConfig, settingService, emailService, turnstileService, emailQueueService, promoService)
 	userService := service.NewUserService(userRepository, apiKeyAuthCacheInvalidator)
-	authHandler := handler.NewAuthHandler(configConfig, authService, userService, settingService, promoService)
+	secretEncryptor, err := repository.NewAESEncryptor(configConfig)
+	if err != nil {
+		return nil, err
+	}
+	totpCache := repository.NewTotpCache(redisClient)
+	totpService := service.NewTotpService(userRepository, secretEncryptor, totpCache, settingService, emailService, emailQueueService)
+	authHandler := handler.NewAuthHandler(configConfig, authService, userService, settingService, promoService, totpService)
 	userHandler := handler.NewUserHandler(userService)
 	apiKeyHandler := handler.NewAPIKeyHandler(apiKeyService)
 	usageLogRepository := repository.NewUsageLogRepository(client, db)
@@ -165,7 +171,8 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	gatewayHandler := handler.NewGatewayHandler(gatewayService, geminiMessagesCompatService, antigravityGatewayService, userService, concurrencyService, billingCacheService, configConfig)
 	openAIGatewayHandler := handler.NewOpenAIGatewayHandler(openAIGatewayService, concurrencyService, billingCacheService, configConfig)
 	handlerSettingHandler := handler.ProvideSettingHandler(settingService, buildInfo)
-	handlers := handler.ProvideHandlers(authHandler, userHandler, apiKeyHandler, usageHandler, redeemHandler, subscriptionHandler, adminHandlers, gatewayHandler, openAIGatewayHandler, handlerSettingHandler)
+	totpHandler := handler.NewTotpHandler(totpService)
+	handlers := handler.ProvideHandlers(authHandler, userHandler, apiKeyHandler, usageHandler, redeemHandler, subscriptionHandler, adminHandlers, gatewayHandler, openAIGatewayHandler, handlerSettingHandler, totpHandler)
 	jwtAuthMiddleware := middleware.NewJWTAuthMiddleware(authService, userService)
 	adminAuthMiddleware := middleware.NewAdminAuthMiddleware(authService, userService, settingService)
 	apiKeyAuthMiddleware := middleware.NewAPIKeyAuthMiddleware(apiKeyService, subscriptionService, configConfig)

backend/ent/migrate/schema.go

@@ -610,6 +610,9 @@ var (
 		{Name: "status", Type: field.TypeString, Size: 20, Default: "active"},
 		{Name: "username", Type: field.TypeString, Size: 100, Default: ""},
 		{Name: "notes", Type: field.TypeString, Default: "", SchemaType: map[string]string{"postgres": "text"}},
+		{Name: "totp_secret_encrypted", Type: field.TypeString, Nullable: true, SchemaType: map[string]string{"postgres": "text"}},
+		{Name: "totp_enabled", Type: field.TypeBool, Default: false},
+		{Name: "totp_enabled_at", Type: field.TypeTime, Nullable: true},
 	}
 	// UsersTable holds the schema information for the "users" table.
 	UsersTable = &schema.Table{

backend/ent/mutation.go

@@ -14360,6 +14360,9 @@ type UserMutation struct {
 	status                        *string
 	username                      *string
 	notes                         *string
+	totp_secret_encrypted         *string
+	totp_enabled                  *bool
+	totp_enabled_at               *time.Time
 	clearedFields                 map[string]struct{}
 	api_keys                      map[int64]struct{}
 	removedapi_keys               map[int64]struct{}
@@ -14937,6 +14940,140 @@ func (m *UserMutation) ResetNotes() {
 	m.notes = nil
 }
 
+// SetTotpSecretEncrypted sets the "totp_secret_encrypted" field.
+func (m *UserMutation) SetTotpSecretEncrypted(s string) {
+	m.totp_secret_encrypted = &s
+}
+
+// TotpSecretEncrypted returns the value of the "totp_secret_encrypted" field in the mutation.
+func (m *UserMutation) TotpSecretEncrypted() (r string, exists bool) {
+	v := m.totp_secret_encrypted
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldTotpSecretEncrypted returns the old "totp_secret_encrypted" field's value of the User entity.
+// If the User object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *UserMutation) OldTotpSecretEncrypted(ctx context.Context) (v *string, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldTotpSecretEncrypted is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldTotpSecretEncrypted requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldTotpSecretEncrypted: %w", err)
+	}
+	return oldValue.TotpSecretEncrypted, nil
+}
+
+// ClearTotpSecretEncrypted clears the value of the "totp_secret_encrypted" field.
+func (m *UserMutation) ClearTotpSecretEncrypted() {
+	m.totp_secret_encrypted = nil
+	m.clearedFields[user.FieldTotpSecretEncrypted] = struct{}{}
+}
+
+// TotpSecretEncryptedCleared returns if the "totp_secret_encrypted" field was cleared in this mutation.
+func (m *UserMutation) TotpSecretEncryptedCleared() bool {
+	_, ok := m.clearedFields[user.FieldTotpSecretEncrypted]
+	return ok
+}
+
+// ResetTotpSecretEncrypted resets all changes to the "totp_secret_encrypted" field.
+func (m *UserMutation) ResetTotpSecretEncrypted() {
+	m.totp_secret_encrypted = nil
+	delete(m.clearedFields, user.FieldTotpSecretEncrypted)
+}
+
+// SetTotpEnabled sets the "totp_enabled" field.
+func (m *UserMutation) SetTotpEnabled(b bool) {
+	m.totp_enabled = &b
+}
+
+// TotpEnabled returns the value of the "totp_enabled" field in the mutation.
+func (m *UserMutation) TotpEnabled() (r bool, exists bool) {
+	v := m.totp_enabled
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldTotpEnabled returns the old "totp_enabled" field's value of the User entity.
+// If the User object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *UserMutation) OldTotpEnabled(ctx context.Context) (v bool, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldTotpEnabled is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldTotpEnabled requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldTotpEnabled: %w", err)
+	}
+	return oldValue.TotpEnabled, nil
+}
+
+// ResetTotpEnabled resets all changes to the "totp_enabled" field.
+func (m *UserMutation) ResetTotpEnabled() {
+	m.totp_enabled = nil
+}
+
+// SetTotpEnabledAt sets the "totp_enabled_at" field.
+func (m *UserMutation) SetTotpEnabledAt(t time.Time) {
+	m.totp_enabled_at = &t
+}
+
+// TotpEnabledAt returns the value of the "totp_enabled_at" field in the mutation.
+func (m *UserMutation) TotpEnabledAt() (r time.Time, exists bool) {
+	v := m.totp_enabled_at
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldTotpEnabledAt returns the old "totp_enabled_at" field's value of the User entity.
+// If the User object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *UserMutation) OldTotpEnabledAt(ctx context.Context) (v *time.Time, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldTotpEnabledAt is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldTotpEnabledAt requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldTotpEnabledAt: %w", err)
+	}
+	return oldValue.TotpEnabledAt, nil
+}
+
+// ClearTotpEnabledAt clears the value of the "totp_enabled_at" field.
+func (m *UserMutation) ClearTotpEnabledAt() {
+	m.totp_enabled_at = nil
+	m.clearedFields[user.FieldTotpEnabledAt] = struct{}{}
+}
+
+// TotpEnabledAtCleared returns if the "totp_enabled_at" field was cleared in this mutation.
+func (m *UserMutation) TotpEnabledAtCleared() bool {
+	_, ok := m.clearedFields[user.FieldTotpEnabledAt]
+	return ok
+}
+
+// ResetTotpEnabledAt resets all changes to the "totp_enabled_at" field.
+func (m *UserMutation) ResetTotpEnabledAt() {
+	m.totp_enabled_at = nil
+	delete(m.clearedFields, user.FieldTotpEnabledAt)
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by ids.
 func (m *UserMutation) AddAPIKeyIDs(ids ...int64) {
 	if m.api_keys == nil {
@@ -15403,7 +15540,7 @@ func (m *UserMutation) Type() string {
 // order to get all numeric fields that were incremented/decremented, call
 // AddedFields().
 func (m *UserMutation) Fields() []string {
-	fields := make([]string, 0, 11)
+	fields := make([]string, 0, 14)
 	if m.created_at != nil {
 		fields = append(fields, user.FieldCreatedAt)
 	}
@@ -15437,6 +15574,15 @@ func (m *UserMutation) Fields() []string {
 	if m.notes != nil {
 		fields = append(fields, user.FieldNotes)
 	}
+	if m.totp_secret_encrypted != nil {
+		fields = append(fields, user.FieldTotpSecretEncrypted)
+	}
+	if m.totp_enabled != nil {
+		fields = append(fields, user.FieldTotpEnabled)
+	}
+	if m.totp_enabled_at != nil {
+		fields = append(fields, user.FieldTotpEnabledAt)
+	}
 	return fields
 }
 
@@ -15467,6 +15613,12 @@ func (m *UserMutation) Field(name string) (ent.Value, bool) {
 		return m.Username()
 	case user.FieldNotes:
 		return m.Notes()
+	case user.FieldTotpSecretEncrypted:
+		return m.TotpSecretEncrypted()
+	case user.FieldTotpEnabled:
+		return m.TotpEnabled()
+	case user.FieldTotpEnabledAt:
+		return m.TotpEnabledAt()
 	}
 	return nil, false
 }
@@ -15498,6 +15650,12 @@ func (m *UserMutation) OldField(ctx context.Context, name string) (ent.Value, er
 		return m.OldUsername(ctx)
 	case user.FieldNotes:
 		return m.OldNotes(ctx)
+	case user.FieldTotpSecretEncrypted:
+		return m.OldTotpSecretEncrypted(ctx)
+	case user.FieldTotpEnabled:
+		return m.OldTotpEnabled(ctx)
+	case user.FieldTotpEnabledAt:
+		return m.OldTotpEnabledAt(ctx)
 	}
 	return nil, fmt.Errorf("unknown User field %s", name)
 }
@@ -15584,6 +15742,27 @@ func (m *UserMutation) SetField(name string, value ent.Value) error {
 		}
 		m.SetNotes(v)
 		return nil
+	case user.FieldTotpSecretEncrypted:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetTotpSecretEncrypted(v)
+		return nil
+	case user.FieldTotpEnabled:
+		v, ok := value.(bool)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetTotpEnabled(v)
+		return nil
+	case user.FieldTotpEnabledAt:
+		v, ok := value.(time.Time)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetTotpEnabledAt(v)
+		return nil
 	}
 	return fmt.Errorf("unknown User field %s", name)
 }
@@ -15644,6 +15823,12 @@ func (m *UserMutation) ClearedFields() []string {
 	if m.FieldCleared(user.FieldDeletedAt) {
 		fields = append(fields, user.FieldDeletedAt)
 	}
+	if m.FieldCleared(user.FieldTotpSecretEncrypted) {
+		fields = append(fields, user.FieldTotpSecretEncrypted)
+	}
+	if m.FieldCleared(user.FieldTotpEnabledAt) {
+		fields = append(fields, user.FieldTotpEnabledAt)
+	}
 	return fields
 }
 
@@ -15661,6 +15846,12 @@ func (m *UserMutation) ClearField(name string) error {
 	case user.FieldDeletedAt:
 		m.ClearDeletedAt()
 		return nil
+	case user.FieldTotpSecretEncrypted:
+		m.ClearTotpSecretEncrypted()
+		return nil
+	case user.FieldTotpEnabledAt:
+		m.ClearTotpEnabledAt()
+		return nil
 	}
 	return fmt.Errorf("unknown User nullable field %s", name)
 }
@@ -15702,6 +15893,15 @@ func (m *UserMutation) ResetField(name string) error {
 	case user.FieldNotes:
 		m.ResetNotes()
 		return nil
+	case user.FieldTotpSecretEncrypted:
+		m.ResetTotpSecretEncrypted()
+		return nil
+	case user.FieldTotpEnabled:
+		m.ResetTotpEnabled()
+		return nil
+	case user.FieldTotpEnabledAt:
+		m.ResetTotpEnabledAt()
+		return nil
 	}
 	return fmt.Errorf("unknown User field %s", name)
 }

backend/ent/runtime/runtime.go

@@ -736,6 +736,10 @@ func init() {
 	userDescNotes := userFields[7].Descriptor()
 	// user.DefaultNotes holds the default value on creation for the notes field.
 	user.DefaultNotes = userDescNotes.Default.(string)
+	// userDescTotpEnabled is the schema descriptor for totp_enabled field.
+	userDescTotpEnabled := userFields[9].Descriptor()
+	// user.DefaultTotpEnabled holds the default value on creation for the totp_enabled field.
+	user.DefaultTotpEnabled = userDescTotpEnabled.Default.(bool)
 	userallowedgroupFields := schema.UserAllowedGroup{}.Fields()
 	_ = userallowedgroupFields
 	// userallowedgroupDescCreatedAt is the schema descriptor for created_at field.

backend/ent/schema/user.go

@@ -61,6 +61,17 @@ func (User) Fields() []ent.Field {
 		field.String("notes").
 			SchemaType(map[string]string{dialect.Postgres: "text"}).
 			Default(""),
+
+		// TOTP 双因素认证字段
+		field.String("totp_secret_encrypted").
+			SchemaType(map[string]string{dialect.Postgres: "text"}).
+			Optional().
+			Nillable(),
+		field.Bool("totp_enabled").
+			Default(false),
+		field.Time("totp_enabled_at").
+			Optional().
+			Nillable(),
 	}
 }
 

backend/ent/user.go

@@ -39,6 +39,12 @@ type User struct {
 	Username string `json:"username,omitempty"`
 	// Notes holds the value of the "notes" field.
 	Notes string `json:"notes,omitempty"`
+	// TotpSecretEncrypted holds the value of the "totp_secret_encrypted" field.
+	TotpSecretEncrypted *string `json:"totp_secret_encrypted,omitempty"`
+	// TotpEnabled holds the value of the "totp_enabled" field.
+	TotpEnabled bool `json:"totp_enabled,omitempty"`
+	// TotpEnabledAt holds the value of the "totp_enabled_at" field.
+	TotpEnabledAt *time.Time `json:"totp_enabled_at,omitempty"`
 	// Edges holds the relations/edges for other nodes in the graph.
 	// The values are being populated by the UserQuery when eager-loading is set.
 	Edges        UserEdges `json:"edges"`
@@ -156,13 +162,15 @@ func (*User) scanValues(columns []string) ([]any, error) {
 	values := make([]any, len(columns))
 	for i := range columns {
 		switch columns[i] {
+		case user.FieldTotpEnabled:
+			values[i] = new(sql.NullBool)
 		case user.FieldBalance:
 			values[i] = new(sql.NullFloat64)
 		case user.FieldID, user.FieldConcurrency:
 			values[i] = new(sql.NullInt64)
-		case user.FieldEmail, user.FieldPasswordHash, user.FieldRole, user.FieldStatus, user.FieldUsername, user.FieldNotes:
+		case user.FieldEmail, user.FieldPasswordHash, user.FieldRole, user.FieldStatus, user.FieldUsername, user.FieldNotes, user.FieldTotpSecretEncrypted:
 			values[i] = new(sql.NullString)
-		case user.FieldCreatedAt, user.FieldUpdatedAt, user.FieldDeletedAt:
+		case user.FieldCreatedAt, user.FieldUpdatedAt, user.FieldDeletedAt, user.FieldTotpEnabledAt:
 			values[i] = new(sql.NullTime)
 		default:
 			values[i] = new(sql.UnknownType)
@@ -252,6 +260,26 @@ func (_m *User) assignValues(columns []string, values []any) error {
 			} else if value.Valid {
 				_m.Notes = value.String
 			}
+		case user.FieldTotpSecretEncrypted:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field totp_secret_encrypted", values[i])
+			} else if value.Valid {
+				_m.TotpSecretEncrypted = new(string)
+				*_m.TotpSecretEncrypted = value.String
+			}
+		case user.FieldTotpEnabled:
+			if value, ok := values[i].(*sql.NullBool); !ok {
+				return fmt.Errorf("unexpected type %T for field totp_enabled", values[i])
+			} else if value.Valid {
+				_m.TotpEnabled = value.Bool
+			}
+		case user.FieldTotpEnabledAt:
+			if value, ok := values[i].(*sql.NullTime); !ok {
+				return fmt.Errorf("unexpected type %T for field totp_enabled_at", values[i])
+			} else if value.Valid {
+				_m.TotpEnabledAt = new(time.Time)
+				*_m.TotpEnabledAt = value.Time
+			}
 		default:
 			_m.selectValues.Set(columns[i], values[i])
 		}
@@ -367,6 +395,19 @@ func (_m *User) String() string {
 	builder.WriteString(", ")
 	builder.WriteString("notes=")
 	builder.WriteString(_m.Notes)
+	builder.WriteString(", ")
+	if v := _m.TotpSecretEncrypted; v != nil {
+		builder.WriteString("totp_secret_encrypted=")
+		builder.WriteString(*v)
+	}
+	builder.WriteString(", ")
+	builder.WriteString("totp_enabled=")
+	builder.WriteString(fmt.Sprintf("%v", _m.TotpEnabled))
+	builder.WriteString(", ")
+	if v := _m.TotpEnabledAt; v != nil {
+		builder.WriteString("totp_enabled_at=")
+		builder.WriteString(v.Format(time.ANSIC))
+	}
 	builder.WriteByte(')')
 	return builder.String()
 }

backend/ent/user/user.go

@@ -37,6 +37,12 @@ const (
 	FieldUsername = "username"
 	// FieldNotes holds the string denoting the notes field in the database.
 	FieldNotes = "notes"
+	// FieldTotpSecretEncrypted holds the string denoting the totp_secret_encrypted field in the database.
+	FieldTotpSecretEncrypted = "totp_secret_encrypted"
+	// FieldTotpEnabled holds the string denoting the totp_enabled field in the database.
+	FieldTotpEnabled = "totp_enabled"
+	// FieldTotpEnabledAt holds the string denoting the totp_enabled_at field in the database.
+	FieldTotpEnabledAt = "totp_enabled_at"
 	// EdgeAPIKeys holds the string denoting the api_keys edge name in mutations.
 	EdgeAPIKeys = "api_keys"
 	// EdgeRedeemCodes holds the string denoting the redeem_codes edge name in mutations.
@@ -134,6 +140,9 @@ var Columns = []string{
 	FieldStatus,
 	FieldUsername,
 	FieldNotes,
+	FieldTotpSecretEncrypted,
+	FieldTotpEnabled,
+	FieldTotpEnabledAt,
 }
 
 var (
@@ -188,6 +197,8 @@ var (
 	UsernameValidator func(string) error
 	// DefaultNotes holds the default value on creation for the "notes" field.
 	DefaultNotes string
+	// DefaultTotpEnabled holds the default value on creation for the "totp_enabled" field.
+	DefaultTotpEnabled bool
 )
 
 // OrderOption defines the ordering options for the User queries.
@@ -253,6 +264,21 @@ func ByNotes(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldNotes, opts...).ToFunc()
 }
 
+// ByTotpSecretEncrypted orders the results by the totp_secret_encrypted field.
+func ByTotpSecretEncrypted(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldTotpSecretEncrypted, opts...).ToFunc()
+}
+
+// ByTotpEnabled orders the results by the totp_enabled field.
+func ByTotpEnabled(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldTotpEnabled, opts...).ToFunc()
+}
+
+// ByTotpEnabledAt orders the results by the totp_enabled_at field.
+func ByTotpEnabledAt(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldTotpEnabledAt, opts...).ToFunc()
+}
+
 // ByAPIKeysCount orders the results by api_keys count.
 func ByAPIKeysCount(opts ...sql.OrderTermOption) OrderOption {
 	return func(s *sql.Selector) {

backend/ent/user/where.go

@@ -110,6 +110,21 @@ func Notes(v string) predicate.User {
 	return predicate.User(sql.FieldEQ(FieldNotes, v))
 }
 
+// TotpSecretEncrypted applies equality check predicate on the "totp_secret_encrypted" field. It's identical to TotpSecretEncryptedEQ.
+func TotpSecretEncrypted(v string) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldTotpSecretEncrypted, v))
+}
+
+// TotpEnabled applies equality check predicate on the "totp_enabled" field. It's identical to TotpEnabledEQ.
+func TotpEnabled(v bool) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldTotpEnabled, v))
+}
+
+// TotpEnabledAt applies equality check predicate on the "totp_enabled_at" field. It's identical to TotpEnabledAtEQ.
+func TotpEnabledAt(v time.Time) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldTotpEnabledAt, v))
+}
+
 // CreatedAtEQ applies the EQ predicate on the "created_at" field.
 func CreatedAtEQ(v time.Time) predicate.User {
 	return predicate.User(sql.FieldEQ(FieldCreatedAt, v))
@@ -710,6 +725,141 @@ func NotesContainsFold(v string) predicate.User {
 	return predicate.User(sql.FieldContainsFold(FieldNotes, v))
 }
 
+// TotpSecretEncryptedEQ applies the EQ predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedEQ(v string) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedNEQ applies the NEQ predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedNEQ(v string) predicate.User {
+	return predicate.User(sql.FieldNEQ(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedIn applies the In predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedIn(vs ...string) predicate.User {
+	return predicate.User(sql.FieldIn(FieldTotpSecretEncrypted, vs...))
+}
+
+// TotpSecretEncryptedNotIn applies the NotIn predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedNotIn(vs ...string) predicate.User {
+	return predicate.User(sql.FieldNotIn(FieldTotpSecretEncrypted, vs...))
+}
+
+// TotpSecretEncryptedGT applies the GT predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedGT(v string) predicate.User {
+	return predicate.User(sql.FieldGT(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedGTE applies the GTE predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedGTE(v string) predicate.User {
+	return predicate.User(sql.FieldGTE(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedLT applies the LT predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedLT(v string) predicate.User {
+	return predicate.User(sql.FieldLT(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedLTE applies the LTE predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedLTE(v string) predicate.User {
+	return predicate.User(sql.FieldLTE(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedContains applies the Contains predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedContains(v string) predicate.User {
+	return predicate.User(sql.FieldContains(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedHasPrefix applies the HasPrefix predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedHasPrefix(v string) predicate.User {
+	return predicate.User(sql.FieldHasPrefix(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedHasSuffix applies the HasSuffix predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedHasSuffix(v string) predicate.User {
+	return predicate.User(sql.FieldHasSuffix(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedIsNil applies the IsNil predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedIsNil() predicate.User {
+	return predicate.User(sql.FieldIsNull(FieldTotpSecretEncrypted))
+}
+
+// TotpSecretEncryptedNotNil applies the NotNil predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedNotNil() predicate.User {
+	return predicate.User(sql.FieldNotNull(FieldTotpSecretEncrypted))
+}
+
+// TotpSecretEncryptedEqualFold applies the EqualFold predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedEqualFold(v string) predicate.User {
+	return predicate.User(sql.FieldEqualFold(FieldTotpSecretEncrypted, v))
+}
+
+// TotpSecretEncryptedContainsFold applies the ContainsFold predicate on the "totp_secret_encrypted" field.
+func TotpSecretEncryptedContainsFold(v string) predicate.User {
+	return predicate.User(sql.FieldContainsFold(FieldTotpSecretEncrypted, v))
+}
+
+// TotpEnabledEQ applies the EQ predicate on the "totp_enabled" field.
+func TotpEnabledEQ(v bool) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldTotpEnabled, v))
+}
+
+// TotpEnabledNEQ applies the NEQ predicate on the "totp_enabled" field.
+func TotpEnabledNEQ(v bool) predicate.User {
+	return predicate.User(sql.FieldNEQ(FieldTotpEnabled, v))
+}
+
+// TotpEnabledAtEQ applies the EQ predicate on the "totp_enabled_at" field.
+func TotpEnabledAtEQ(v time.Time) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldTotpEnabledAt, v))
+}
+
+// TotpEnabledAtNEQ applies the NEQ predicate on the "totp_enabled_at" field.
+func TotpEnabledAtNEQ(v time.Time) predicate.User {
+	return predicate.User(sql.FieldNEQ(FieldTotpEnabledAt, v))
+}
+
+// TotpEnabledAtIn applies the In predicate on the "totp_enabled_at" field.
+func TotpEnabledAtIn(vs ...time.Time) predicate.User {
+	return predicate.User(sql.FieldIn(FieldTotpEnabledAt, vs...))
+}
+
+// TotpEnabledAtNotIn applies the NotIn predicate on the "totp_enabled_at" field.
+func TotpEnabledAtNotIn(vs ...time.Time) predicate.User {
+	return predicate.User(sql.FieldNotIn(FieldTotpEnabledAt, vs...))
+}
+
+// TotpEnabledAtGT applies the GT predicate on the "totp_enabled_at" field.
+func TotpEnabledAtGT(v time.Time) predicate.User {
+	return predicate.User(sql.FieldGT(FieldTotpEnabledAt, v))
+}
+
+// TotpEnabledAtGTE applies the GTE predicate on the "totp_enabled_at" field.
+func TotpEnabledAtGTE(v time.Time) predicate.User {
+	return predicate.User(sql.FieldGTE(FieldTotpEnabledAt, v))
+}
+
+// TotpEnabledAtLT applies the LT predicate on the "totp_enabled_at" field.
+func TotpEnabledAtLT(v time.Time) predicate.User {
+	return predicate.User(sql.FieldLT(FieldTotpEnabledAt, v))
+}
+
+// TotpEnabledAtLTE applies the LTE predicate on the "totp_enabled_at" field.
+func TotpEnabledAtLTE(v time.Time) predicate.User {
+	return predicate.User(sql.FieldLTE(FieldTotpEnabledAt, v))
+}
+
+// TotpEnabledAtIsNil applies the IsNil predicate on the "totp_enabled_at" field.
+func TotpEnabledAtIsNil() predicate.User {
+	return predicate.User(sql.FieldIsNull(FieldTotpEnabledAt))
+}
+
+// TotpEnabledAtNotNil applies the NotNil predicate on the "totp_enabled_at" field.
+func TotpEnabledAtNotNil() predicate.User {
+	return predicate.User(sql.FieldNotNull(FieldTotpEnabledAt))
+}
+
 // HasAPIKeys applies the HasEdge predicate on the "api_keys" edge.
 func HasAPIKeys() predicate.User {
 	return predicate.User(func(s *sql.Selector) {

backend/ent/user_create.go

@@ -167,6 +167,48 @@ func (_c *UserCreate) SetNillableNotes(v *string) *UserCreate {
 	return _c
 }
 
+// SetTotpSecretEncrypted sets the "totp_secret_encrypted" field.
+func (_c *UserCreate) SetTotpSecretEncrypted(v string) *UserCreate {
+	_c.mutation.SetTotpSecretEncrypted(v)
+	return _c
+}
+
+// SetNillableTotpSecretEncrypted sets the "totp_secret_encrypted" field if the given value is not nil.
+func (_c *UserCreate) SetNillableTotpSecretEncrypted(v *string) *UserCreate {
+	if v != nil {
+		_c.SetTotpSecretEncrypted(*v)
+	}
+	return _c
+}
+
+// SetTotpEnabled sets the "totp_enabled" field.
+func (_c *UserCreate) SetTotpEnabled(v bool) *UserCreate {
+	_c.mutation.SetTotpEnabled(v)
+	return _c
+}
+
+// SetNillableTotpEnabled sets the "totp_enabled" field if the given value is not nil.
+func (_c *UserCreate) SetNillableTotpEnabled(v *bool) *UserCreate {
+	if v != nil {
+		_c.SetTotpEnabled(*v)
+	}
+	return _c
+}
+
+// SetTotpEnabledAt sets the "totp_enabled_at" field.
+func (_c *UserCreate) SetTotpEnabledAt(v time.Time) *UserCreate {
+	_c.mutation.SetTotpEnabledAt(v)
+	return _c
+}
+
+// SetNillableTotpEnabledAt sets the "totp_enabled_at" field if the given value is not nil.
+func (_c *UserCreate) SetNillableTotpEnabledAt(v *time.Time) *UserCreate {
+	if v != nil {
+		_c.SetTotpEnabledAt(*v)
+	}
+	return _c
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_c *UserCreate) AddAPIKeyIDs(ids ...int64) *UserCreate {
 	_c.mutation.AddAPIKeyIDs(ids...)
@@ -362,6 +404,10 @@ func (_c *UserCreate) defaults() error {
 		v := user.DefaultNotes
 		_c.mutation.SetNotes(v)
 	}
+	if _, ok := _c.mutation.TotpEnabled(); !ok {
+		v := user.DefaultTotpEnabled
+		_c.mutation.SetTotpEnabled(v)
+	}
 	return nil
 }
 
@@ -422,6 +468,9 @@ func (_c *UserCreate) check() error {
 	if _, ok := _c.mutation.Notes(); !ok {
 		return &ValidationError{Name: "notes", err: errors.New(`ent: missing required field "User.notes"`)}
 	}
+	if _, ok := _c.mutation.TotpEnabled(); !ok {
+		return &ValidationError{Name: "totp_enabled", err: errors.New(`ent: missing required field "User.totp_enabled"`)}
+	}
 	return nil
 }
 
@@ -493,6 +542,18 @@ func (_c *UserCreate) createSpec() (*User, *sqlgraph.CreateSpec) {
 		_spec.SetField(user.FieldNotes, field.TypeString, value)
 		_node.Notes = value
 	}
+	if value, ok := _c.mutation.TotpSecretEncrypted(); ok {
+		_spec.SetField(user.FieldTotpSecretEncrypted, field.TypeString, value)
+		_node.TotpSecretEncrypted = &value
+	}
+	if value, ok := _c.mutation.TotpEnabled(); ok {
+		_spec.SetField(user.FieldTotpEnabled, field.TypeBool, value)
+		_node.TotpEnabled = value
+	}
+	if value, ok := _c.mutation.TotpEnabledAt(); ok {
+		_spec.SetField(user.FieldTotpEnabledAt, field.TypeTime, value)
+		_node.TotpEnabledAt = &value
+	}
 	if nodes := _c.mutation.APIKeysIDs(); len(nodes) > 0 {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -815,6 +876,54 @@ func (u *UserUpsert) UpdateNotes() *UserUpsert {
 	return u
 }
 
+// SetTotpSecretEncrypted sets the "totp_secret_encrypted" field.
+func (u *UserUpsert) SetTotpSecretEncrypted(v string) *UserUpsert {
+	u.Set(user.FieldTotpSecretEncrypted, v)
+	return u
+}
+
+// UpdateTotpSecretEncrypted sets the "totp_secret_encrypted" field to the value that was provided on create.
+func (u *UserUpsert) UpdateTotpSecretEncrypted() *UserUpsert {
+	u.SetExcluded(user.FieldTotpSecretEncrypted)
+	return u
+}
+
+// ClearTotpSecretEncrypted clears the value of the "totp_secret_encrypted" field.
+func (u *UserUpsert) ClearTotpSecretEncrypted() *UserUpsert {
+	u.SetNull(user.FieldTotpSecretEncrypted)
+	return u
+}
+
+// SetTotpEnabled sets the "totp_enabled" field.
+func (u *UserUpsert) SetTotpEnabled(v bool) *UserUpsert {
+	u.Set(user.FieldTotpEnabled, v)
+	return u
+}
+
+// UpdateTotpEnabled sets the "totp_enabled" field to the value that was provided on create.
+func (u *UserUpsert) UpdateTotpEnabled() *UserUpsert {
+	u.SetExcluded(user.FieldTotpEnabled)
+	return u
+}
+
+// SetTotpEnabledAt sets the "totp_enabled_at" field.
+func (u *UserUpsert) SetTotpEnabledAt(v time.Time) *UserUpsert {
+	u.Set(user.FieldTotpEnabledAt, v)
+	return u
+}
+
+// UpdateTotpEnabledAt sets the "totp_enabled_at" field to the value that was provided on create.
+func (u *UserUpsert) UpdateTotpEnabledAt() *UserUpsert {
+	u.SetExcluded(user.FieldTotpEnabledAt)
+	return u
+}
+
+// ClearTotpEnabledAt clears the value of the "totp_enabled_at" field.
+func (u *UserUpsert) ClearTotpEnabledAt() *UserUpsert {
+	u.SetNull(user.FieldTotpEnabledAt)
+	return u
+}
+
 // UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
@@ -1021,6 +1130,62 @@ func (u *UserUpsertOne) UpdateNotes() *UserUpsertOne {
 	})
 }
 
+// SetTotpSecretEncrypted sets the "totp_secret_encrypted" field.
+func (u *UserUpsertOne) SetTotpSecretEncrypted(v string) *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.SetTotpSecretEncrypted(v)
+	})
+}
+
+// UpdateTotpSecretEncrypted sets the "totp_secret_encrypted" field to the value that was provided on create.
+func (u *UserUpsertOne) UpdateTotpSecretEncrypted() *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateTotpSecretEncrypted()
+	})
+}
+
+// ClearTotpSecretEncrypted clears the value of the "totp_secret_encrypted" field.
+func (u *UserUpsertOne) ClearTotpSecretEncrypted() *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.ClearTotpSecretEncrypted()
+	})
+}
+
+// SetTotpEnabled sets the "totp_enabled" field.
+func (u *UserUpsertOne) SetTotpEnabled(v bool) *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.SetTotpEnabled(v)
+	})
+}
+
+// UpdateTotpEnabled sets the "totp_enabled" field to the value that was provided on create.
+func (u *UserUpsertOne) UpdateTotpEnabled() *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateTotpEnabled()
+	})
+}
+
+// SetTotpEnabledAt sets the "totp_enabled_at" field.
+func (u *UserUpsertOne) SetTotpEnabledAt(v time.Time) *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.SetTotpEnabledAt(v)
+	})
+}
+
+// UpdateTotpEnabledAt sets the "totp_enabled_at" field to the value that was provided on create.
+func (u *UserUpsertOne) UpdateTotpEnabledAt() *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateTotpEnabledAt()
+	})
+}
+
+// ClearTotpEnabledAt clears the value of the "totp_enabled_at" field.
+func (u *UserUpsertOne) ClearTotpEnabledAt() *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.ClearTotpEnabledAt()
+	})
+}
+
 // Exec executes the query.
 func (u *UserUpsertOne) Exec(ctx context.Context) error {
 	if len(u.create.conflict) == 0 {
@@ -1393,6 +1558,62 @@ func (u *UserUpsertBulk) UpdateNotes() *UserUpsertBulk {
 	})
 }
 
+// SetTotpSecretEncrypted sets the "totp_secret_encrypted" field.
+func (u *UserUpsertBulk) SetTotpSecretEncrypted(v string) *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.SetTotpSecretEncrypted(v)
+	})
+}
+
+// UpdateTotpSecretEncrypted sets the "totp_secret_encrypted" field to the value that was provided on create.
+func (u *UserUpsertBulk) UpdateTotpSecretEncrypted() *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateTotpSecretEncrypted()
+	})
+}
+
+// ClearTotpSecretEncrypted clears the value of the "totp_secret_encrypted" field.
+func (u *UserUpsertBulk) ClearTotpSecretEncrypted() *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.ClearTotpSecretEncrypted()
+	})
+}
+
+// SetTotpEnabled sets the "totp_enabled" field.
+func (u *UserUpsertBulk) SetTotpEnabled(v bool) *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.SetTotpEnabled(v)
+	})
+}
+
+// UpdateTotpEnabled sets the "totp_enabled" field to the value that was provided on create.
+func (u *UserUpsertBulk) UpdateTotpEnabled() *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateTotpEnabled()
+	})
+}
+
+// SetTotpEnabledAt sets the "totp_enabled_at" field.
+func (u *UserUpsertBulk) SetTotpEnabledAt(v time.Time) *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.SetTotpEnabledAt(v)
+	})
+}
+
+// UpdateTotpEnabledAt sets the "totp_enabled_at" field to the value that was provided on create.
+func (u *UserUpsertBulk) UpdateTotpEnabledAt() *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateTotpEnabledAt()
+	})
+}
+
+// ClearTotpEnabledAt clears the value of the "totp_enabled_at" field.
+func (u *UserUpsertBulk) ClearTotpEnabledAt() *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.ClearTotpEnabledAt()
+	})
+}
+
 // Exec executes the query.
 func (u *UserUpsertBulk) Exec(ctx context.Context) error {
 	if u.create.err != nil {

backend/ent/user_update.go

@@ -187,6 +187,60 @@ func (_u *UserUpdate) SetNillableNotes(v *string) *UserUpdate {
 	return _u
 }
 
+// SetTotpSecretEncrypted sets the "totp_secret_encrypted" field.
+func (_u *UserUpdate) SetTotpSecretEncrypted(v string) *UserUpdate {
+	_u.mutation.SetTotpSecretEncrypted(v)
+	return _u
+}
+
+// SetNillableTotpSecretEncrypted sets the "totp_secret_encrypted" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableTotpSecretEncrypted(v *string) *UserUpdate {
+	if v != nil {
+		_u.SetTotpSecretEncrypted(*v)
+	}
+	return _u
+}
+
+// ClearTotpSecretEncrypted clears the value of the "totp_secret_encrypted" field.
+func (_u *UserUpdate) ClearTotpSecretEncrypted() *UserUpdate {
+	_u.mutation.ClearTotpSecretEncrypted()
+	return _u
+}
+
+// SetTotpEnabled sets the "totp_enabled" field.
+func (_u *UserUpdate) SetTotpEnabled(v bool) *UserUpdate {
+	_u.mutation.SetTotpEnabled(v)
+	return _u
+}
+
+// SetNillableTotpEnabled sets the "totp_enabled" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableTotpEnabled(v *bool) *UserUpdate {
+	if v != nil {
+		_u.SetTotpEnabled(*v)
+	}
+	return _u
+}
+
+// SetTotpEnabledAt sets the "totp_enabled_at" field.
+func (_u *UserUpdate) SetTotpEnabledAt(v time.Time) *UserUpdate {
+	_u.mutation.SetTotpEnabledAt(v)
+	return _u
+}
+
+// SetNillableTotpEnabledAt sets the "totp_enabled_at" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableTotpEnabledAt(v *time.Time) *UserUpdate {
+	if v != nil {
+		_u.SetTotpEnabledAt(*v)
+	}
+	return _u
+}
+
+// ClearTotpEnabledAt clears the value of the "totp_enabled_at" field.
+func (_u *UserUpdate) ClearTotpEnabledAt() *UserUpdate {
+	_u.mutation.ClearTotpEnabledAt()
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *UserUpdate) AddAPIKeyIDs(ids ...int64) *UserUpdate {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -603,6 +657,21 @@ func (_u *UserUpdate) sqlSave(ctx context.Context) (_node int, err error) {
 	if value, ok := _u.mutation.Notes(); ok {
 		_spec.SetField(user.FieldNotes, field.TypeString, value)
 	}
+	if value, ok := _u.mutation.TotpSecretEncrypted(); ok {
+		_spec.SetField(user.FieldTotpSecretEncrypted, field.TypeString, value)
+	}
+	if _u.mutation.TotpSecretEncryptedCleared() {
+		_spec.ClearField(user.FieldTotpSecretEncrypted, field.TypeString)
+	}
+	if value, ok := _u.mutation.TotpEnabled(); ok {
+		_spec.SetField(user.FieldTotpEnabled, field.TypeBool, value)
+	}
+	if value, ok := _u.mutation.TotpEnabledAt(); ok {
+		_spec.SetField(user.FieldTotpEnabledAt, field.TypeTime, value)
+	}
+	if _u.mutation.TotpEnabledAtCleared() {
+		_spec.ClearField(user.FieldTotpEnabledAt, field.TypeTime)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -1147,6 +1216,60 @@ func (_u *UserUpdateOne) SetNillableNotes(v *string) *UserUpdateOne {
 	return _u
 }
 
+// SetTotpSecretEncrypted sets the "totp_secret_encrypted" field.
+func (_u *UserUpdateOne) SetTotpSecretEncrypted(v string) *UserUpdateOne {
+	_u.mutation.SetTotpSecretEncrypted(v)
+	return _u
+}
+
+// SetNillableTotpSecretEncrypted sets the "totp_secret_encrypted" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableTotpSecretEncrypted(v *string) *UserUpdateOne {
+	if v != nil {
+		_u.SetTotpSecretEncrypted(*v)
+	}
+	return _u
+}
+
+// ClearTotpSecretEncrypted clears the value of the "totp_secret_encrypted" field.
+func (_u *UserUpdateOne) ClearTotpSecretEncrypted() *UserUpdateOne {
+	_u.mutation.ClearTotpSecretEncrypted()
+	return _u
+}
+
+// SetTotpEnabled sets the "totp_enabled" field.
+func (_u *UserUpdateOne) SetTotpEnabled(v bool) *UserUpdateOne {
+	_u.mutation.SetTotpEnabled(v)
+	return _u
+}
+
+// SetNillableTotpEnabled sets the "totp_enabled" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableTotpEnabled(v *bool) *UserUpdateOne {
+	if v != nil {
+		_u.SetTotpEnabled(*v)
+	}
+	return _u
+}
+
+// SetTotpEnabledAt sets the "totp_enabled_at" field.
+func (_u *UserUpdateOne) SetTotpEnabledAt(v time.Time) *UserUpdateOne {
+	_u.mutation.SetTotpEnabledAt(v)
+	return _u
+}
+
+// SetNillableTotpEnabledAt sets the "totp_enabled_at" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableTotpEnabledAt(v *time.Time) *UserUpdateOne {
+	if v != nil {
+		_u.SetTotpEnabledAt(*v)
+	}
+	return _u
+}
+
+// ClearTotpEnabledAt clears the value of the "totp_enabled_at" field.
+func (_u *UserUpdateOne) ClearTotpEnabledAt() *UserUpdateOne {
+	_u.mutation.ClearTotpEnabledAt()
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *UserUpdateOne) AddAPIKeyIDs(ids ...int64) *UserUpdateOne {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -1593,6 +1716,21 @@ func (_u *UserUpdateOne) sqlSave(ctx context.Context) (_node *User, err error) {
 	if value, ok := _u.mutation.Notes(); ok {
 		_spec.SetField(user.FieldNotes, field.TypeString, value)
 	}
+	if value, ok := _u.mutation.TotpSecretEncrypted(); ok {
+		_spec.SetField(user.FieldTotpSecretEncrypted, field.TypeString, value)
+	}
+	if _u.mutation.TotpSecretEncryptedCleared() {
+		_spec.ClearField(user.FieldTotpSecretEncrypted, field.TypeString)
+	}
+	if value, ok := _u.mutation.TotpEnabled(); ok {
+		_spec.SetField(user.FieldTotpEnabled, field.TypeBool, value)
+	}
+	if value, ok := _u.mutation.TotpEnabledAt(); ok {
+		_spec.SetField(user.FieldTotpEnabledAt, field.TypeTime, value)
+	}
+	if _u.mutation.TotpEnabledAtCleared() {
+		_spec.ClearField(user.FieldTotpEnabledAt, field.TypeTime)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,

backend/go.mod

@@ -37,6 +37,7 @@ require (
 	github.com/andybalholm/brotli v1.2.0 // indirect
 	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
 	github.com/bmatcuk/doublestar v1.3.4 // indirect
+	github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc // indirect
 	github.com/bytedance/sonic v1.9.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
@@ -106,6 +107,7 @@ require (
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/pquerna/otp v1.5.0 // indirect
 	github.com/quic-go/qpack v0.6.0 // indirect
 	github.com/quic-go/quic-go v0.57.1 // indirect
 	github.com/refraction-networking/utls v1.8.1 // indirect

backend/go.sum

@@ -20,6 +20,8 @@ github.com/apparentlymart/go-textseg/v15 v15.0.0 h1:uYvfpb3DyLSCGWnctWKGj857c6ew
 github.com/apparentlymart/go-textseg/v15 v15.0.0/go.mod h1:K8XmNZdhEBkdlyDdvbmmsvpAG721bKi0joRfFdHIWJ4=
 github.com/bmatcuk/doublestar v1.3.4 h1:gPypJ5xD31uhX6Tf54sDPUOBXTqKH4c9aPY66CyQrS0=
 github.com/bmatcuk/doublestar v1.3.4/go.mod h1:wiQtGV+rzVYxB7WIlirSN++5HPtPlXEo9MEoZQC/PmE=
+github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc h1:biVzkmvwrH8WK8raXaxBx6fRVTlJILwEwQGL1I/ByEI=
+github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
 github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
 github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
 github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
@@ -217,6 +219,8 @@ github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRI
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c h1:ncq/mPwQF4JjgDlrVEn3C11VoGHZN7m8qihwgMEtzYw=
 github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c/go.mod h1:OmDBASR4679mdNQnz2pUhc2G8CO2JrUAVFDRBDP/hJE=
+github.com/pquerna/otp v1.5.0 h1:NMMR+WrmaqXU4EzdGJEE1aUUI0AMRzsp96fFFWNPwxs=
+github.com/pquerna/otp v1.5.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
 github.com/prashantv/gostub v1.1.0 h1:BTyx3RfQjRHnUWaGF9oQos79AlQ5k8WNktv7VGvVH4g=
 github.com/prashantv/gostub v1.1.0/go.mod h1:A5zLQHz7ieHGG7is6LLXLz7I8+3LZzsrV0P1IAHhP5U=
 github.com/quic-go/qpack v0.6.0 h1:g7W+BMYynC1LbYLSqRt8PBg5Tgwxn214ZZR34VIOjz8=

backend/internal/config/config.go

@@ -47,6 +47,7 @@ type Config struct {
 	Redis        RedisConfig                `mapstructure:"redis"`
 	Ops          OpsConfig                  `mapstructure:"ops"`
 	JWT          JWTConfig                  `mapstructure:"jwt"`
+	Totp         TotpConfig                 `mapstructure:"totp"`
 	LinuxDo      LinuxDoConnectConfig       `mapstructure:"linuxdo_connect"`
 	Default      DefaultConfig              `mapstructure:"default"`
 	RateLimit    RateLimitConfig            `mapstructure:"rate_limit"`
@@ -466,6 +467,16 @@ type JWTConfig struct {
 	ExpireHour int    `mapstructure:"expire_hour"`
 }
 
+// TotpConfig TOTP 双因素认证配置
+type TotpConfig struct {
+	// EncryptionKey 用于加密 TOTP 密钥的 AES-256 密钥（32 字节 hex 编码）
+	// 如果为空，将自动生成一个随机密钥（仅适用于开发环境）
+	EncryptionKey string `mapstructure:"encryption_key"`
+	// EncryptionKeyConfigured 标记加密密钥是否为手动配置（非自动生成）
+	// 只有手动配置了密钥才允许在管理后台启用 TOTP 功能
+	EncryptionKeyConfigured bool `mapstructure:"-"`
+}
+
 type TurnstileConfig struct {
 	Required bool `mapstructure:"required"`
 }
@@ -626,6 +637,20 @@ func Load() (*Config, error) {
 		log.Println("Warning: JWT secret auto-generated. Consider setting a fixed secret for production.")
 	}
 
+	// Auto-generate TOTP encryption key if not set (32 bytes = 64 hex chars for AES-256)
+	cfg.Totp.EncryptionKey = strings.TrimSpace(cfg.Totp.EncryptionKey)
+	if cfg.Totp.EncryptionKey == "" {
+		key, err := generateJWTSecret(32) // Reuse the same random generation function
+		if err != nil {
+			return nil, fmt.Errorf("generate totp encryption key error: %w", err)
+		}
+		cfg.Totp.EncryptionKey = key
+		cfg.Totp.EncryptionKeyConfigured = false
+		log.Println("Warning: TOTP encryption key auto-generated. Consider setting a fixed key for production.")
+	} else {
+		cfg.Totp.EncryptionKeyConfigured = true
+	}
+
 	if err := cfg.Validate(); err != nil {
 		return nil, fmt.Errorf("validate config error: %w", err)
 	}
@@ -756,6 +781,9 @@ func setDefaults() {
 	viper.SetDefault("jwt.secret", "")
 	viper.SetDefault("jwt.expire_hour", 24)
 
+	// TOTP
+	viper.SetDefault("totp.encryption_key", "")
+
 	// Default
 	// Admin credentials are created via the setup flow (web wizard / CLI / AUTO_SETUP).
 	// Do not ship fixed defaults here to avoid insecure "known credentials" in production.

backend/internal/handler/admin/setting_handler.go

@@ -49,6 +49,8 @@ func (h *SettingHandler) GetSettings(c *gin.Context) {
 		EmailVerifyEnabled:                   settings.EmailVerifyEnabled,
 		PromoCodeEnabled:                     settings.PromoCodeEnabled,
 		PasswordResetEnabled:                 settings.PasswordResetEnabled,
+		TotpEnabled:                          settings.TotpEnabled,
+		TotpEncryptionKeyConfigured:          h.settingService.IsTotpEncryptionKeyConfigured(),
 		SMTPHost:                             settings.SMTPHost,
 		SMTPPort:                             settings.SMTPPort,
 		SMTPUsername:                         settings.SMTPUsername,
@@ -94,6 +96,7 @@ type UpdateSettingsRequest struct {
 	EmailVerifyEnabled   bool `json:"email_verify_enabled"`
 	PromoCodeEnabled     bool `json:"promo_code_enabled"`
 	PasswordResetEnabled bool `json:"password_reset_enabled"`
+	TotpEnabled          bool `json:"totp_enabled"` // TOTP 双因素认证
 
 	// 邮件服务设置
 	SMTPHost     string `json:"smtp_host"`
@@ -200,6 +203,16 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		}
 	}
 
+	// TOTP 双因素认证参数验证
+	// 只有手动配置了加密密钥才允许启用 TOTP 功能
+	if req.TotpEnabled && !previousSettings.TotpEnabled {
+		// 尝试启用 TOTP，检查加密密钥是否已手动配置
+		if !h.settingService.IsTotpEncryptionKeyConfigured() {
+			response.BadRequest(c, "Cannot enable TOTP: TOTP_ENCRYPTION_KEY environment variable must be configured first. Generate a key with 'openssl rand -hex 32' and set it in your environment.")
+			return
+		}
+	}
+
 	// LinuxDo Connect 参数验证
 	if req.LinuxDoConnectEnabled {
 		req.LinuxDoConnectClientID = strings.TrimSpace(req.LinuxDoConnectClientID)
@@ -246,6 +259,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		EmailVerifyEnabled:         req.EmailVerifyEnabled,
 		PromoCodeEnabled:           req.PromoCodeEnabled,
 		PasswordResetEnabled:       req.PasswordResetEnabled,
+		TotpEnabled:                req.TotpEnabled,
 		SMTPHost:                   req.SMTPHost,
 		SMTPPort:                   req.SMTPPort,
 		SMTPUsername:               req.SMTPUsername,
@@ -322,6 +336,8 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		EmailVerifyEnabled:                   updatedSettings.EmailVerifyEnabled,
 		PromoCodeEnabled:                     updatedSettings.PromoCodeEnabled,
 		PasswordResetEnabled:                 updatedSettings.PasswordResetEnabled,
+		TotpEnabled:                          updatedSettings.TotpEnabled,
+		TotpEncryptionKeyConfigured:          h.settingService.IsTotpEncryptionKeyConfigured(),
 		SMTPHost:                             updatedSettings.SMTPHost,
 		SMTPPort:                             updatedSettings.SMTPPort,
 		SMTPUsername:                         updatedSettings.SMTPUsername,
@@ -391,6 +407,9 @@ func diffSettings(before *service.SystemSettings, after *service.SystemSettings,
 	if before.PasswordResetEnabled != after.PasswordResetEnabled {
 		changed = append(changed, "password_reset_enabled")
 	}
+	if before.TotpEnabled != after.TotpEnabled {
+		changed = append(changed, "totp_enabled")
+	}
 	if before.SMTPHost != after.SMTPHost {
 		changed = append(changed, "smtp_host")
 	}

backend/internal/handler/auth_handler.go

@@ -1,6 +1,8 @@
 package handler
 
 import (
+	"log/slog"
+
 	"github.com/Wei-Shaw/sub2api/internal/config"
 	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/ip"
@@ -18,16 +20,18 @@ type AuthHandler struct {
 	userService  *service.UserService
 	settingSvc   *service.SettingService
 	promoService *service.PromoService
+	totpService  *service.TotpService
 }
 
 // NewAuthHandler creates a new AuthHandler
-func NewAuthHandler(cfg *config.Config, authService *service.AuthService, userService *service.UserService, settingService *service.SettingService, promoService *service.PromoService) *AuthHandler {
+func NewAuthHandler(cfg *config.Config, authService *service.AuthService, userService *service.UserService, settingService *service.SettingService, promoService *service.PromoService, totpService *service.TotpService) *AuthHandler {
 	return &AuthHandler{
 		cfg:          cfg,
 		authService:  authService,
 		userService:  userService,
 		settingSvc:   settingService,
 		promoService: promoService,
+		totpService:  totpService,
 	}
 }
 
@@ -144,6 +148,100 @@ func (h *AuthHandler) Login(c *gin.Context) {
 		return
 	}
 
+	// Check if TOTP 2FA is enabled for this user
+	if h.totpService != nil && h.settingSvc.IsTotpEnabled(c.Request.Context()) && user.TotpEnabled {
+		// Create a temporary login session for 2FA
+		tempToken, err := h.totpService.CreateLoginSession(c.Request.Context(), user.ID, user.Email)
+		if err != nil {
+			response.InternalError(c, "Failed to create 2FA session")
+			return
+		}
+
+		response.Success(c, TotpLoginResponse{
+			Requires2FA:     true,
+			TempToken:       tempToken,
+			UserEmailMasked: service.MaskEmail(user.Email),
+		})
+		return
+	}
+
+	response.Success(c, AuthResponse{
+		AccessToken: token,
+		TokenType:   "Bearer",
+		User:        dto.UserFromService(user),
+	})
+}
+
+// TotpLoginResponse represents the response when 2FA is required
+type TotpLoginResponse struct {
+	Requires2FA     bool   `json:"requires_2fa"`
+	TempToken       string `json:"temp_token,omitempty"`
+	UserEmailMasked string `json:"user_email_masked,omitempty"`
+}
+
+// Login2FARequest represents the 2FA login request
+type Login2FARequest struct {
+	TempToken string `json:"temp_token" binding:"required"`
+	TotpCode  string `json:"totp_code" binding:"required,len=6"`
+}
+
+// Login2FA completes the login with 2FA verification
+// POST /api/v1/auth/login/2fa
+func (h *AuthHandler) Login2FA(c *gin.Context) {
+	var req Login2FARequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	slog.Debug("login_2fa_request",
+		"temp_token_len", len(req.TempToken),
+		"totp_code_len", len(req.TotpCode))
+
+	// Get the login session
+	session, err := h.totpService.GetLoginSession(c.Request.Context(), req.TempToken)
+	if err != nil || session == nil {
+		tokenPrefix := ""
+		if len(req.TempToken) >= 8 {
+			tokenPrefix = req.TempToken[:8]
+		}
+		slog.Debug("login_2fa_session_invalid",
+			"temp_token_prefix", tokenPrefix,
+			"error", err)
+		response.BadRequest(c, "Invalid or expired 2FA session")
+		return
+	}
+
+	slog.Debug("login_2fa_session_found",
+		"user_id", session.UserID,
+		"email", session.Email)
+
+	// Verify the TOTP code
+	if err := h.totpService.VerifyCode(c.Request.Context(), session.UserID, req.TotpCode); err != nil {
+		slog.Debug("login_2fa_verify_failed",
+			"user_id", session.UserID,
+			"error", err)
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	// Delete the login session
+	_ = h.totpService.DeleteLoginSession(c.Request.Context(), req.TempToken)
+
+	// Get the user
+	user, err := h.userService.GetByID(c.Request.Context(), session.UserID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	// Generate the JWT token
+	token, err := h.authService.GenerateToken(user)
+	if err != nil {
+		response.InternalError(c, "Failed to generate token")
+		return
+	}
+
 	response.Success(c, AuthResponse{
 		AccessToken: token,
 		TokenType:   "Bearer",

backend/internal/handler/dto/settings.go

@@ -2,10 +2,12 @@ package dto
 
 // SystemSettings represents the admin settings API response payload.
 type SystemSettings struct {
-	RegistrationEnabled  bool `json:"registration_enabled"`
-	EmailVerifyEnabled   bool `json:"email_verify_enabled"`
-	PromoCodeEnabled     bool `json:"promo_code_enabled"`
-	PasswordResetEnabled bool `json:"password_reset_enabled"`
+	RegistrationEnabled         bool `json:"registration_enabled"`
+	EmailVerifyEnabled          bool `json:"email_verify_enabled"`
+	PromoCodeEnabled            bool `json:"promo_code_enabled"`
+	PasswordResetEnabled        bool `json:"password_reset_enabled"`
+	TotpEnabled                 bool `json:"totp_enabled"`                   // TOTP 双因素认证
+	TotpEncryptionKeyConfigured bool `json:"totp_encryption_key_configured"` // TOTP 加密密钥是否已配置
 
 	SMTPHost               string `json:"smtp_host"`
 	SMTPPort               int    `json:"smtp_port"`
@@ -59,6 +61,7 @@ type PublicSettings struct {
 	EmailVerifyEnabled   bool   `json:"email_verify_enabled"`
 	PromoCodeEnabled     bool   `json:"promo_code_enabled"`
 	PasswordResetEnabled bool   `json:"password_reset_enabled"`
+	TotpEnabled          bool   `json:"totp_enabled"` // TOTP 双因素认证
 	TurnstileEnabled     bool   `json:"turnstile_enabled"`
 	TurnstileSiteKey     string `json:"turnstile_site_key"`
 	SiteName             string `json:"site_name"`

backend/internal/handler/handler.go

@@ -37,6 +37,7 @@ type Handlers struct {
 	Gateway       *GatewayHandler
 	OpenAIGateway *OpenAIGatewayHandler
 	Setting       *SettingHandler
+	Totp          *TotpHandler
 }
 
 // BuildInfo contains build-time information

backend/internal/handler/totp_handler.go

@@ -0,0 +1,181 @@
+package handler
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+// TotpHandler handles TOTP-related requests
+type TotpHandler struct {
+	totpService *service.TotpService
+}
+
+// NewTotpHandler creates a new TotpHandler
+func NewTotpHandler(totpService *service.TotpService) *TotpHandler {
+	return &TotpHandler{
+		totpService: totpService,
+	}
+}
+
+// TotpStatusResponse represents the TOTP status response
+type TotpStatusResponse struct {
+	Enabled        bool   `json:"enabled"`
+	EnabledAt      *int64 `json:"enabled_at,omitempty"` // Unix timestamp
+	FeatureEnabled bool   `json:"feature_enabled"`
+}
+
+// GetStatus returns the TOTP status for the current user
+// GET /api/v1/user/totp/status
+func (h *TotpHandler) GetStatus(c *gin.Context) {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
+		response.Unauthorized(c, "User not authenticated")
+		return
+	}
+
+	status, err := h.totpService.GetStatus(c.Request.Context(), subject.UserID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	resp := TotpStatusResponse{
+		Enabled:        status.Enabled,
+		FeatureEnabled: status.FeatureEnabled,
+	}
+
+	if status.EnabledAt != nil {
+		ts := status.EnabledAt.Unix()
+		resp.EnabledAt = &ts
+	}
+
+	response.Success(c, resp)
+}
+
+// TotpSetupRequest represents the request to initiate TOTP setup
+type TotpSetupRequest struct {
+	EmailCode string `json:"email_code"`
+	Password  string `json:"password"`
+}
+
+// TotpSetupResponse represents the TOTP setup response
+type TotpSetupResponse struct {
+	Secret     string `json:"secret"`
+	QRCodeURL  string `json:"qr_code_url"`
+	SetupToken string `json:"setup_token"`
+	Countdown  int    `json:"countdown"`
+}
+
+// InitiateSetup starts the TOTP setup process
+// POST /api/v1/user/totp/setup
+func (h *TotpHandler) InitiateSetup(c *gin.Context) {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
+		response.Unauthorized(c, "User not authenticated")
+		return
+	}
+
+	var req TotpSetupRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		// Allow empty body (optional params)
+		req = TotpSetupRequest{}
+	}
+
+	result, err := h.totpService.InitiateSetup(c.Request.Context(), subject.UserID, req.EmailCode, req.Password)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, TotpSetupResponse{
+		Secret:     result.Secret,
+		QRCodeURL:  result.QRCodeURL,
+		SetupToken: result.SetupToken,
+		Countdown:  result.Countdown,
+	})
+}
+
+// TotpEnableRequest represents the request to enable TOTP
+type TotpEnableRequest struct {
+	TotpCode   string `json:"totp_code" binding:"required,len=6"`
+	SetupToken string `json:"setup_token" binding:"required"`
+}
+
+// Enable completes the TOTP setup
+// POST /api/v1/user/totp/enable
+func (h *TotpHandler) Enable(c *gin.Context) {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
+		response.Unauthorized(c, "User not authenticated")
+		return
+	}
+
+	var req TotpEnableRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	if err := h.totpService.CompleteSetup(c.Request.Context(), subject.UserID, req.TotpCode, req.SetupToken); err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, gin.H{"success": true})
+}
+
+// TotpDisableRequest represents the request to disable TOTP
+type TotpDisableRequest struct {
+	EmailCode string `json:"email_code"`
+	Password  string `json:"password"`
+}
+
+// Disable disables TOTP for the current user
+// POST /api/v1/user/totp/disable
+func (h *TotpHandler) Disable(c *gin.Context) {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
+		response.Unauthorized(c, "User not authenticated")
+		return
+	}
+
+	var req TotpDisableRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	if err := h.totpService.Disable(c.Request.Context(), subject.UserID, req.EmailCode, req.Password); err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, gin.H{"success": true})
+}
+
+// GetVerificationMethod returns the verification method for TOTP operations
+// GET /api/v1/user/totp/verification-method
+func (h *TotpHandler) GetVerificationMethod(c *gin.Context) {
+	method := h.totpService.GetVerificationMethod(c.Request.Context())
+	response.Success(c, method)
+}
+
+// SendVerifyCode sends an email verification code for TOTP operations
+// POST /api/v1/user/totp/send-code
+func (h *TotpHandler) SendVerifyCode(c *gin.Context) {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
+		response.Unauthorized(c, "User not authenticated")
+		return
+	}
+
+	if err := h.totpService.SendVerifyCode(c.Request.Context(), subject.UserID); err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, gin.H{"success": true})
+}

backend/internal/handler/wire.go

@@ -70,6 +70,7 @@ func ProvideHandlers(
 	gatewayHandler *GatewayHandler,
 	openaiGatewayHandler *OpenAIGatewayHandler,
 	settingHandler *SettingHandler,
+	totpHandler *TotpHandler,
 ) *Handlers {
 	return &Handlers{
 		Auth:          authHandler,
@@ -82,6 +83,7 @@ func ProvideHandlers(
 		Gateway:       gatewayHandler,
 		OpenAIGateway: openaiGatewayHandler,
 		Setting:       settingHandler,
+		Totp:          totpHandler,
 	}
 }
 
@@ -96,6 +98,7 @@ var ProviderSet = wire.NewSet(
 	NewSubscriptionHandler,
 	NewGatewayHandler,
 	NewOpenAIGatewayHandler,
+	NewTotpHandler,
 	ProvideSettingHandler,
 
 	// Admin handlers

backend/internal/pkg/tlsfingerprint/dialer_integration_test.go

@@ -0,0 +1,278 @@
+//go:build integration
+
+// Package tlsfingerprint provides TLS fingerprint simulation for HTTP clients.
+//
+// Integration tests for verifying TLS fingerprint correctness.
+// These tests make actual network requests to external services and should be run manually.
+//
+// Run with: go test -v -tags=integration ./internal/pkg/tlsfingerprint/...
+package tlsfingerprint
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"net/http"
+	"strings"
+	"testing"
+	"time"
+)
+
+// skipIfExternalServiceUnavailable checks if the external service is available.
+// If not, it skips the test instead of failing.
+func skipIfExternalServiceUnavailable(t *testing.T, err error) {
+	t.Helper()
+	if err != nil {
+		// Check for common network/TLS errors that indicate external service issues
+		errStr := err.Error()
+		if strings.Contains(errStr, "certificate has expired") ||
+			strings.Contains(errStr, "certificate is not yet valid") ||
+			strings.Contains(errStr, "connection refused") ||
+			strings.Contains(errStr, "no such host") ||
+			strings.Contains(errStr, "network is unreachable") ||
+			strings.Contains(errStr, "timeout") {
+			t.Skipf("skipping test: external service unavailable: %v", err)
+		}
+		t.Fatalf("failed to get fingerprint: %v", err)
+	}
+}
+
+// TestJA3Fingerprint verifies the JA3/JA4 fingerprint matches expected value.
+// This test uses tls.peet.ws to verify the fingerprint.
+// Expected JA3 hash: 1a28e69016765d92e3b381168d68922c (Claude CLI / Node.js 20.x)
+// Expected JA4: t13d5911h1_a33745022dd6_1f22a2ca17c4 (d=domain) or t13i5911h1_... (i=IP)
+func TestJA3Fingerprint(t *testing.T) {
+	// Skip if network is unavailable or if running in short mode
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	profile := &Profile{
+		Name:         "Claude CLI Test",
+		EnableGREASE: false,
+	}
+	dialer := NewDialer(profile, nil)
+
+	client := &http.Client{
+		Transport: &http.Transport{
+			DialTLSContext: dialer.DialTLSContext,
+		},
+		Timeout: 30 * time.Second,
+	}
+
+	// Use tls.peet.ws fingerprint detection API
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, "GET", "https://tls.peet.ws/api/all", nil)
+	if err != nil {
+		t.Fatalf("failed to create request: %v", err)
+	}
+	req.Header.Set("User-Agent", "Claude Code/2.0.0 Node.js/20.0.0")
+
+	resp, err := client.Do(req)
+	skipIfExternalServiceUnavailable(t, err)
+	defer func() { _ = resp.Body.Close() }()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatalf("failed to read response: %v", err)
+	}
+
+	var fpResp FingerprintResponse
+	if err := json.Unmarshal(body, &fpResp); err != nil {
+		t.Logf("Response body: %s", string(body))
+		t.Fatalf("failed to parse fingerprint response: %v", err)
+	}
+
+	// Log all fingerprint information
+	t.Logf("JA3: %s", fpResp.TLS.JA3)
+	t.Logf("JA3 Hash: %s", fpResp.TLS.JA3Hash)
+	t.Logf("JA4: %s", fpResp.TLS.JA4)
+	t.Logf("PeetPrint: %s", fpResp.TLS.PeetPrint)
+	t.Logf("PeetPrint Hash: %s", fpResp.TLS.PeetPrintHash)
+
+	// Verify JA3 hash matches expected value
+	expectedJA3Hash := "1a28e69016765d92e3b381168d68922c"
+	if fpResp.TLS.JA3Hash == expectedJA3Hash {
+		t.Logf("✓ JA3 hash matches expected value: %s", expectedJA3Hash)
+	} else {
+		t.Errorf("✗ JA3 hash mismatch: got %s, expected %s", fpResp.TLS.JA3Hash, expectedJA3Hash)
+	}
+
+	// Verify JA4 fingerprint
+	// JA4 format: t[version][sni][cipher_count][ext_count][alpn]_[cipher_hash]_[ext_hash]
+	// Expected: t13d5910h1 (d=domain) or t13i5910h1 (i=IP)
+	// The suffix _a33745022dd6_1f22a2ca17c4 should match
+	expectedJA4Suffix := "_a33745022dd6_1f22a2ca17c4"
+	if strings.HasSuffix(fpResp.TLS.JA4, expectedJA4Suffix) {
+		t.Logf("✓ JA4 suffix matches expected value: %s", expectedJA4Suffix)
+	} else {
+		t.Errorf("✗ JA4 suffix mismatch: got %s, expected suffix %s", fpResp.TLS.JA4, expectedJA4Suffix)
+	}
+
+	// Verify JA4 prefix (t13d5911h1 or t13i5911h1)
+	// d = domain (SNI present), i = IP (no SNI)
+	// Since we connect to tls.peet.ws (domain), we expect 'd'
+	expectedJA4Prefix := "t13d5911h1"
+	if strings.HasPrefix(fpResp.TLS.JA4, expectedJA4Prefix) {
+		t.Logf("✓ JA4 prefix matches: %s (t13=TLS1.3, d=domain, 59=ciphers, 11=extensions, h1=HTTP/1.1)", expectedJA4Prefix)
+	} else {
+		// Also accept 'i' variant for IP connections
+		altPrefix := "t13i5911h1"
+		if strings.HasPrefix(fpResp.TLS.JA4, altPrefix) {
+			t.Logf("✓ JA4 prefix matches (IP variant): %s", altPrefix)
+		} else {
+			t.Errorf("✗ JA4 prefix mismatch: got %s, expected %s or %s", fpResp.TLS.JA4, expectedJA4Prefix, altPrefix)
+		}
+	}
+
+	// Verify JA3 contains expected cipher suites (TLS 1.3 ciphers at the beginning)
+	if strings.Contains(fpResp.TLS.JA3, "4866-4867-4865") {
+		t.Logf("✓ JA3 contains expected TLS 1.3 cipher suites")
+	} else {
+		t.Logf("Warning: JA3 does not contain expected TLS 1.3 cipher suites")
+	}
+
+	// Verify extension list (should be 11 extensions including SNI)
+	// Expected: 0-11-10-35-16-22-23-13-43-45-51
+	expectedExtensions := "0-11-10-35-16-22-23-13-43-45-51"
+	if strings.Contains(fpResp.TLS.JA3, expectedExtensions) {
+		t.Logf("✓ JA3 contains expected extension list: %s", expectedExtensions)
+	} else {
+		t.Logf("Warning: JA3 extension list may differ")
+	}
+}
+
+// TestProfileExpectation defines expected fingerprint values for a profile.
+type TestProfileExpectation struct {
+	Profile       *Profile
+	ExpectedJA3   string // Expected JA3 hash (empty = don't check)
+	ExpectedJA4   string // Expected full JA4 (empty = don't check)
+	JA4CipherHash string // Expected JA4 cipher hash - the stable middle part (empty = don't check)
+}
+
+// TestAllProfiles tests multiple TLS fingerprint profiles against tls.peet.ws.
+// Run with: go test -v -tags=integration -run TestAllProfiles ./internal/pkg/tlsfingerprint/...
+func TestAllProfiles(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	// Define all profiles to test with their expected fingerprints
+	// These profiles are from config.yaml gateway.tls_fingerprint.profiles
+	profiles := []TestProfileExpectation{
+		{
+			// Linux x64 Node.js v22.17.1
+			// Expected JA3 Hash: 1a28e69016765d92e3b381168d68922c
+			// Expected JA4: t13d5911h1_a33745022dd6_1f22a2ca17c4
+			Profile: &Profile{
+				Name:         "linux_x64_node_v22171",
+				EnableGREASE: false,
+				CipherSuites: []uint16{4866, 4867, 4865, 49199, 49195, 49200, 49196, 158, 49191, 103, 49192, 107, 163, 159, 52393, 52392, 52394, 49327, 49325, 49315, 49311, 49245, 49249, 49239, 49235, 162, 49326, 49324, 49314, 49310, 49244, 49248, 49238, 49234, 49188, 106, 49187, 64, 49162, 49172, 57, 56, 49161, 49171, 51, 50, 157, 49313, 49309, 49233, 156, 49312, 49308, 49232, 61, 60, 53, 47, 255},
+				Curves:       []uint16{29, 23, 30, 25, 24, 256, 257, 258, 259, 260},
+				PointFormats: []uint8{0, 1, 2},
+			},
+			JA4CipherHash: "a33745022dd6", // stable part
+		},
+		{
+			// MacOS arm64 Node.js v22.18.0
+			// Expected JA3 Hash: 70cb5ca646080902703ffda87036a5ea
+			// Expected JA4: t13d5912h1_a33745022dd6_dbd39dd1d406
+			Profile: &Profile{
+				Name:         "macos_arm64_node_v22180",
+				EnableGREASE: false,
+				CipherSuites: []uint16{4866, 4867, 4865, 49199, 49195, 49200, 49196, 158, 49191, 103, 49192, 107, 163, 159, 52393, 52392, 52394, 49327, 49325, 49315, 49311, 49245, 49249, 49239, 49235, 162, 49326, 49324, 49314, 49310, 49244, 49248, 49238, 49234, 49188, 106, 49187, 64, 49162, 49172, 57, 56, 49161, 49171, 51, 50, 157, 49313, 49309, 49233, 156, 49312, 49308, 49232, 61, 60, 53, 47, 255},
+				Curves:       []uint16{29, 23, 30, 25, 24, 256, 257, 258, 259, 260},
+				PointFormats: []uint8{0, 1, 2},
+			},
+			JA4CipherHash: "a33745022dd6", // stable part (same cipher suites)
+		},
+	}
+
+	for _, tc := range profiles {
+		tc := tc // capture range variable
+		t.Run(tc.Profile.Name, func(t *testing.T) {
+			fp := fetchFingerprint(t, tc.Profile)
+			if fp == nil {
+				return // fetchFingerprint already called t.Fatal
+			}
+
+			t.Logf("Profile: %s", tc.Profile.Name)
+			t.Logf("  JA3:           %s", fp.JA3)
+			t.Logf("  JA3 Hash:      %s", fp.JA3Hash)
+			t.Logf("  JA4:           %s", fp.JA4)
+			t.Logf("  PeetPrint:     %s", fp.PeetPrint)
+			t.Logf("  PeetPrintHash: %s", fp.PeetPrintHash)
+
+			// Verify expectations
+			if tc.ExpectedJA3 != "" {
+				if fp.JA3Hash == tc.ExpectedJA3 {
+					t.Logf("  ✓ JA3 hash matches: %s", tc.ExpectedJA3)
+				} else {
+					t.Errorf("  ✗ JA3 hash mismatch: got %s, expected %s", fp.JA3Hash, tc.ExpectedJA3)
+				}
+			}
+
+			if tc.ExpectedJA4 != "" {
+				if fp.JA4 == tc.ExpectedJA4 {
+					t.Logf("  ✓ JA4 matches: %s", tc.ExpectedJA4)
+				} else {
+					t.Errorf("  ✗ JA4 mismatch: got %s, expected %s", fp.JA4, tc.ExpectedJA4)
+				}
+			}
+
+			// Check JA4 cipher hash (stable middle part)
+			// JA4 format: prefix_cipherHash_extHash
+			if tc.JA4CipherHash != "" {
+				if strings.Contains(fp.JA4, "_"+tc.JA4CipherHash+"_") {
+					t.Logf("  ✓ JA4 cipher hash matches: %s", tc.JA4CipherHash)
+				} else {
+					t.Errorf("  ✗ JA4 cipher hash mismatch: got %s, expected cipher hash %s", fp.JA4, tc.JA4CipherHash)
+				}
+			}
+		})
+	}
+}
+
+// fetchFingerprint makes a request to tls.peet.ws and returns the TLS fingerprint info.
+func fetchFingerprint(t *testing.T, profile *Profile) *TLSInfo {
+	t.Helper()
+
+	dialer := NewDialer(profile, nil)
+	client := &http.Client{
+		Transport: &http.Transport{
+			DialTLSContext: dialer.DialTLSContext,
+		},
+		Timeout: 30 * time.Second,
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, "GET", "https://tls.peet.ws/api/all", nil)
+	if err != nil {
+		t.Fatalf("failed to create request: %v", err)
+		return nil
+	}
+	req.Header.Set("User-Agent", "Claude Code/2.0.0 Node.js/20.0.0")
+
+	resp, err := client.Do(req)
+	skipIfExternalServiceUnavailable(t, err)
+	defer func() { _ = resp.Body.Close() }()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatalf("failed to read response: %v", err)
+		return nil
+	}
+
+	var fpResp FingerprintResponse
+	if err := json.Unmarshal(body, &fpResp); err != nil {
+		t.Logf("Response body: %s", string(body))
+		t.Fatalf("failed to parse fingerprint response: %v", err)
+		return nil
+	}
+
+	return &fpResp.TLS
+}

backend/internal/pkg/tlsfingerprint/dialer_test.go

@@ -1,21 +1,16 @@
 // Package tlsfingerprint provides TLS fingerprint simulation for HTTP clients.
 //
-// Integration tests for verifying TLS fingerprint correctness.
-// These tests make actual network requests and should be run manually.
+// Unit tests for TLS fingerprint dialer.
+// Integration tests that require external network are in dialer_integration_test.go
+// and require the 'integration' build tag.
 //
-// Run with: go test -v ./internal/pkg/tlsfingerprint/...
-// Run integration tests: go test -v -run TestJA3 ./internal/pkg/tlsfingerprint/...
+// Run unit tests: go test -v ./internal/pkg/tlsfingerprint/...
+// Run integration tests: go test -v -tags=integration ./internal/pkg/tlsfingerprint/...
 package tlsfingerprint
 
 import (
-	"context"
-	"encoding/json"
-	"io"
-	"net/http"
 	"net/url"
-	"strings"
 	"testing"
-	"time"
 )
 
 // FingerprintResponse represents the response from tls.peet.ws/api/all.
@@ -36,148 +31,6 @@ type TLSInfo struct {
 	SessionID     string `json:"session_id"`
 }
 
-// TestDialerBasicConnection tests that the dialer can establish TLS connections.
-func TestDialerBasicConnection(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping network test in short mode")
-	}
-
-	// Create a dialer with default profile
-	profile := &Profile{
-		Name:         "Test Profile",
-		EnableGREASE: false,
-	}
-	dialer := NewDialer(profile, nil)
-
-	// Create HTTP client with custom TLS dialer
-	client := &http.Client{
-		Transport: &http.Transport{
-			DialTLSContext: dialer.DialTLSContext,
-		},
-		Timeout: 30 * time.Second,
-	}
-
-	// Make a request to a known HTTPS endpoint
-	resp, err := client.Get("https://www.google.com")
-	if err != nil {
-		t.Fatalf("failed to connect: %v", err)
-	}
-	defer func() { _ = resp.Body.Close() }()
-
-	if resp.StatusCode != http.StatusOK {
-		t.Errorf("expected status 200, got %d", resp.StatusCode)
-	}
-}
-
-// TestJA3Fingerprint verifies the JA3/JA4 fingerprint matches expected value.
-// This test uses tls.peet.ws to verify the fingerprint.
-// Expected JA3 hash: 1a28e69016765d92e3b381168d68922c (Claude CLI / Node.js 20.x)
-// Expected JA4: t13d5911h1_a33745022dd6_1f22a2ca17c4 (d=domain) or t13i5911h1_... (i=IP)
-func TestJA3Fingerprint(t *testing.T) {
-	// Skip if network is unavailable or if running in short mode
-	if testing.Short() {
-		t.Skip("skipping integration test in short mode")
-	}
-
-	profile := &Profile{
-		Name:         "Claude CLI Test",
-		EnableGREASE: false,
-	}
-	dialer := NewDialer(profile, nil)
-
-	client := &http.Client{
-		Transport: &http.Transport{
-			DialTLSContext: dialer.DialTLSContext,
-		},
-		Timeout: 30 * time.Second,
-	}
-
-	// Use tls.peet.ws fingerprint detection API
-	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
-	defer cancel()
-
-	req, err := http.NewRequestWithContext(ctx, "GET", "https://tls.peet.ws/api/all", nil)
-	if err != nil {
-		t.Fatalf("failed to create request: %v", err)
-	}
-	req.Header.Set("User-Agent", "Claude Code/2.0.0 Node.js/20.0.0")
-
-	resp, err := client.Do(req)
-	if err != nil {
-		t.Fatalf("failed to get fingerprint: %v", err)
-	}
-	defer func() { _ = resp.Body.Close() }()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		t.Fatalf("failed to read response: %v", err)
-	}
-
-	var fpResp FingerprintResponse
-	if err := json.Unmarshal(body, &fpResp); err != nil {
-		t.Logf("Response body: %s", string(body))
-		t.Fatalf("failed to parse fingerprint response: %v", err)
-	}
-
-	// Log all fingerprint information
-	t.Logf("JA3: %s", fpResp.TLS.JA3)
-	t.Logf("JA3 Hash: %s", fpResp.TLS.JA3Hash)
-	t.Logf("JA4: %s", fpResp.TLS.JA4)
-	t.Logf("PeetPrint: %s", fpResp.TLS.PeetPrint)
-	t.Logf("PeetPrint Hash: %s", fpResp.TLS.PeetPrintHash)
-
-	// Verify JA3 hash matches expected value
-	expectedJA3Hash := "1a28e69016765d92e3b381168d68922c"
-	if fpResp.TLS.JA3Hash == expectedJA3Hash {
-		t.Logf("✓ JA3 hash matches expected value: %s", expectedJA3Hash)
-	} else {
-		t.Errorf("✗ JA3 hash mismatch: got %s, expected %s", fpResp.TLS.JA3Hash, expectedJA3Hash)
-	}
-
-	// Verify JA4 fingerprint
-	// JA4 format: t[version][sni][cipher_count][ext_count][alpn]_[cipher_hash]_[ext_hash]
-	// Expected: t13d5910h1 (d=domain) or t13i5910h1 (i=IP)
-	// The suffix _a33745022dd6_1f22a2ca17c4 should match
-	expectedJA4Suffix := "_a33745022dd6_1f22a2ca17c4"
-	if strings.HasSuffix(fpResp.TLS.JA4, expectedJA4Suffix) {
-		t.Logf("✓ JA4 suffix matches expected value: %s", expectedJA4Suffix)
-	} else {
-		t.Errorf("✗ JA4 suffix mismatch: got %s, expected suffix %s", fpResp.TLS.JA4, expectedJA4Suffix)
-	}
-
-	// Verify JA4 prefix (t13d5911h1 or t13i5911h1)
-	// d = domain (SNI present), i = IP (no SNI)
-	// Since we connect to tls.peet.ws (domain), we expect 'd'
-	expectedJA4Prefix := "t13d5911h1"
-	if strings.HasPrefix(fpResp.TLS.JA4, expectedJA4Prefix) {
-		t.Logf("✓ JA4 prefix matches: %s (t13=TLS1.3, d=domain, 59=ciphers, 11=extensions, h1=HTTP/1.1)", expectedJA4Prefix)
-	} else {
-		// Also accept 'i' variant for IP connections
-		altPrefix := "t13i5911h1"
-		if strings.HasPrefix(fpResp.TLS.JA4, altPrefix) {
-			t.Logf("✓ JA4 prefix matches (IP variant): %s", altPrefix)
-		} else {
-			t.Errorf("✗ JA4 prefix mismatch: got %s, expected %s or %s", fpResp.TLS.JA4, expectedJA4Prefix, altPrefix)
-		}
-	}
-
-	// Verify JA3 contains expected cipher suites (TLS 1.3 ciphers at the beginning)
-	if strings.Contains(fpResp.TLS.JA3, "4866-4867-4865") {
-		t.Logf("✓ JA3 contains expected TLS 1.3 cipher suites")
-	} else {
-		t.Logf("Warning: JA3 does not contain expected TLS 1.3 cipher suites")
-	}
-
-	// Verify extension list (should be 11 extensions including SNI)
-	// Expected: 0-11-10-35-16-22-23-13-43-45-51
-	expectedExtensions := "0-11-10-35-16-22-23-13-43-45-51"
-	if strings.Contains(fpResp.TLS.JA3, expectedExtensions) {
-		t.Logf("✓ JA3 contains expected extension list: %s", expectedExtensions)
-	} else {
-		t.Logf("Warning: JA3 extension list may differ")
-	}
-}
-
 // TestDialerWithProfile tests that different profiles produce different fingerprints.
 func TestDialerWithProfile(t *testing.T) {
 	// Create two dialers with different profiles
@@ -305,139 +158,3 @@ func mustParseURL(rawURL string) *url.URL {
 	}
 	return u
 }
-
-// TestProfileExpectation defines expected fingerprint values for a profile.
-type TestProfileExpectation struct {
-	Profile       *Profile
-	ExpectedJA3   string // Expected JA3 hash (empty = don't check)
-	ExpectedJA4   string // Expected full JA4 (empty = don't check)
-	JA4CipherHash string // Expected JA4 cipher hash - the stable middle part (empty = don't check)
-}
-
-// TestAllProfiles tests multiple TLS fingerprint profiles against tls.peet.ws.
-// Run with: go test -v -run TestAllProfiles ./internal/pkg/tlsfingerprint/...
-func TestAllProfiles(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping integration test in short mode")
-	}
-
-	// Define all profiles to test with their expected fingerprints
-	// These profiles are from config.yaml gateway.tls_fingerprint.profiles
-	profiles := []TestProfileExpectation{
-		{
-			// Linux x64 Node.js v22.17.1
-			// Expected JA3 Hash: 1a28e69016765d92e3b381168d68922c
-			// Expected JA4: t13d5911h1_a33745022dd6_1f22a2ca17c4
-			Profile: &Profile{
-				Name:         "linux_x64_node_v22171",
-				EnableGREASE: false,
-				CipherSuites: []uint16{4866, 4867, 4865, 49199, 49195, 49200, 49196, 158, 49191, 103, 49192, 107, 163, 159, 52393, 52392, 52394, 49327, 49325, 49315, 49311, 49245, 49249, 49239, 49235, 162, 49326, 49324, 49314, 49310, 49244, 49248, 49238, 49234, 49188, 106, 49187, 64, 49162, 49172, 57, 56, 49161, 49171, 51, 50, 157, 49313, 49309, 49233, 156, 49312, 49308, 49232, 61, 60, 53, 47, 255},
-				Curves:       []uint16{29, 23, 30, 25, 24, 256, 257, 258, 259, 260},
-				PointFormats: []uint8{0, 1, 2},
-			},
-			JA4CipherHash: "a33745022dd6", // stable part
-		},
-		{
-			// MacOS arm64 Node.js v22.18.0
-			// Expected JA3 Hash: 70cb5ca646080902703ffda87036a5ea
-			// Expected JA4: t13d5912h1_a33745022dd6_dbd39dd1d406
-			Profile: &Profile{
-				Name:         "macos_arm64_node_v22180",
-				EnableGREASE: false,
-				CipherSuites: []uint16{4866, 4867, 4865, 49199, 49195, 49200, 49196, 158, 49191, 103, 49192, 107, 163, 159, 52393, 52392, 52394, 49327, 49325, 49315, 49311, 49245, 49249, 49239, 49235, 162, 49326, 49324, 49314, 49310, 49244, 49248, 49238, 49234, 49188, 106, 49187, 64, 49162, 49172, 57, 56, 49161, 49171, 51, 50, 157, 49313, 49309, 49233, 156, 49312, 49308, 49232, 61, 60, 53, 47, 255},
-				Curves:       []uint16{29, 23, 30, 25, 24, 256, 257, 258, 259, 260},
-				PointFormats: []uint8{0, 1, 2},
-			},
-			JA4CipherHash: "a33745022dd6", // stable part (same cipher suites)
-		},
-	}
-
-	for _, tc := range profiles {
-		tc := tc // capture range variable
-		t.Run(tc.Profile.Name, func(t *testing.T) {
-			fp := fetchFingerprint(t, tc.Profile)
-			if fp == nil {
-				return // fetchFingerprint already called t.Fatal
-			}
-
-			t.Logf("Profile: %s", tc.Profile.Name)
-			t.Logf("  JA3:           %s", fp.JA3)
-			t.Logf("  JA3 Hash:      %s", fp.JA3Hash)
-			t.Logf("  JA4:           %s", fp.JA4)
-			t.Logf("  PeetPrint:     %s", fp.PeetPrint)
-			t.Logf("  PeetPrintHash: %s", fp.PeetPrintHash)
-
-			// Verify expectations
-			if tc.ExpectedJA3 != "" {
-				if fp.JA3Hash == tc.ExpectedJA3 {
-					t.Logf("  ✓ JA3 hash matches: %s", tc.ExpectedJA3)
-				} else {
-					t.Errorf("  ✗ JA3 hash mismatch: got %s, expected %s", fp.JA3Hash, tc.ExpectedJA3)
-				}
-			}
-
-			if tc.ExpectedJA4 != "" {
-				if fp.JA4 == tc.ExpectedJA4 {
-					t.Logf("  ✓ JA4 matches: %s", tc.ExpectedJA4)
-				} else {
-					t.Errorf("  ✗ JA4 mismatch: got %s, expected %s", fp.JA4, tc.ExpectedJA4)
-				}
-			}
-
-			// Check JA4 cipher hash (stable middle part)
-			// JA4 format: prefix_cipherHash_extHash
-			if tc.JA4CipherHash != "" {
-				if strings.Contains(fp.JA4, "_"+tc.JA4CipherHash+"_") {
-					t.Logf("  ✓ JA4 cipher hash matches: %s", tc.JA4CipherHash)
-				} else {
-					t.Errorf("  ✗ JA4 cipher hash mismatch: got %s, expected cipher hash %s", fp.JA4, tc.JA4CipherHash)
-				}
-			}
-		})
-	}
-}
-
-// fetchFingerprint makes a request to tls.peet.ws and returns the TLS fingerprint info.
-func fetchFingerprint(t *testing.T, profile *Profile) *TLSInfo {
-	t.Helper()
-
-	dialer := NewDialer(profile, nil)
-	client := &http.Client{
-		Transport: &http.Transport{
-			DialTLSContext: dialer.DialTLSContext,
-		},
-		Timeout: 30 * time.Second,
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
-	defer cancel()
-
-	req, err := http.NewRequestWithContext(ctx, "GET", "https://tls.peet.ws/api/all", nil)
-	if err != nil {
-		t.Fatalf("failed to create request: %v", err)
-		return nil
-	}
-	req.Header.Set("User-Agent", "Claude Code/2.0.0 Node.js/20.0.0")
-
-	resp, err := client.Do(req)
-	if err != nil {
-		t.Fatalf("failed to get fingerprint: %v", err)
-		return nil
-	}
-	defer func() { _ = resp.Body.Close() }()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		t.Fatalf("failed to read response: %v", err)
-		return nil
-	}
-
-	var fpResp FingerprintResponse
-	if err := json.Unmarshal(body, &fpResp); err != nil {
-		t.Logf("Response body: %s", string(body))
-		t.Fatalf("failed to parse fingerprint response: %v", err)
-		return nil
-	}
-
-	return &fpResp.TLS
-}

backend/internal/repository/aes_encryptor.go

@@ -0,0 +1,95 @@
+package repository
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/hex"
+	"fmt"
+	"io"
+
+	"github.com/Wei-Shaw/sub2api/internal/config"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+// AESEncryptor implements SecretEncryptor using AES-256-GCM
+type AESEncryptor struct {
+	key []byte
+}
+
+// NewAESEncryptor creates a new AES encryptor
+func NewAESEncryptor(cfg *config.Config) (service.SecretEncryptor, error) {
+	key, err := hex.DecodeString(cfg.Totp.EncryptionKey)
+	if err != nil {
+		return nil, fmt.Errorf("invalid totp encryption key: %w", err)
+	}
+
+	if len(key) != 32 {
+		return nil, fmt.Errorf("totp encryption key must be 32 bytes (64 hex chars), got %d bytes", len(key))
+	}
+
+	return &AESEncryptor{key: key}, nil
+}
+
+// Encrypt encrypts plaintext using AES-256-GCM
+// Output format: base64(nonce + ciphertext + tag)
+func (e *AESEncryptor) Encrypt(plaintext string) (string, error) {
+	block, err := aes.NewCipher(e.key)
+	if err != nil {
+		return "", fmt.Errorf("create cipher: %w", err)
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", fmt.Errorf("create gcm: %w", err)
+	}
+
+	// Generate a random nonce
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
+		return "", fmt.Errorf("generate nonce: %w", err)
+	}
+
+	// Encrypt the plaintext
+	// Seal appends the ciphertext and tag to the nonce
+	ciphertext := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
+
+	// Encode as base64
+	return base64.StdEncoding.EncodeToString(ciphertext), nil
+}
+
+// Decrypt decrypts ciphertext using AES-256-GCM
+func (e *AESEncryptor) Decrypt(ciphertext string) (string, error) {
+	// Decode from base64
+	data, err := base64.StdEncoding.DecodeString(ciphertext)
+	if err != nil {
+		return "", fmt.Errorf("decode base64: %w", err)
+	}
+
+	block, err := aes.NewCipher(e.key)
+	if err != nil {
+		return "", fmt.Errorf("create cipher: %w", err)
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", fmt.Errorf("create gcm: %w", err)
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(data) < nonceSize {
+		return "", fmt.Errorf("ciphertext too short")
+	}
+
+	// Extract nonce and ciphertext
+	nonce, ciphertextData := data[:nonceSize], data[nonceSize:]
+
+	// Decrypt
+	plaintext, err := gcm.Open(nil, nonce, ciphertextData, nil)
+	if err != nil {
+		return "", fmt.Errorf("decrypt: %w", err)
+	}
+
+	return string(plaintext), nil
+}

backend/internal/repository/api_key_repo.go

@@ -387,17 +387,20 @@ func userEntityToService(u *dbent.User) *service.User {
 		return nil
 	}
 	return &service.User{
-		ID:           u.ID,
-		Email:        u.Email,
-		Username:     u.Username,
-		Notes:        u.Notes,
-		PasswordHash: u.PasswordHash,
-		Role:         u.Role,
-		Balance:      u.Balance,
-		Concurrency:  u.Concurrency,
-		Status:       u.Status,
-		CreatedAt:    u.CreatedAt,
-		UpdatedAt:    u.UpdatedAt,
+		ID:                  u.ID,
+		Email:               u.Email,
+		Username:            u.Username,
+		Notes:               u.Notes,
+		PasswordHash:        u.PasswordHash,
+		Role:                u.Role,
+		Balance:             u.Balance,
+		Concurrency:         u.Concurrency,
+		Status:              u.Status,
+		TotpSecretEncrypted: u.TotpSecretEncrypted,
+		TotpEnabled:         u.TotpEnabled,
+		TotpEnabledAt:       u.TotpEnabledAt,
+		CreatedAt:           u.CreatedAt,
+		UpdatedAt:           u.UpdatedAt,
 	}
 }
 

backend/internal/repository/totp_cache.go

@@ -0,0 +1,149 @@
+package repository
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+const (
+	totpSetupKeyPrefix    = "totp:setup:"
+	totpLoginKeyPrefix    = "totp:login:"
+	totpAttemptsKeyPrefix = "totp:attempts:"
+	totpAttemptsTTL       = 15 * time.Minute
+)
+
+// TotpCache implements service.TotpCache using Redis
+type TotpCache struct {
+	rdb *redis.Client
+}
+
+// NewTotpCache creates a new TOTP cache
+func NewTotpCache(rdb *redis.Client) service.TotpCache {
+	return &TotpCache{rdb: rdb}
+}
+
+// GetSetupSession retrieves a TOTP setup session
+func (c *TotpCache) GetSetupSession(ctx context.Context, userID int64) (*service.TotpSetupSession, error) {
+	key := fmt.Sprintf("%s%d", totpSetupKeyPrefix, userID)
+	data, err := c.rdb.Get(ctx, key).Bytes()
+	if err != nil {
+		if err == redis.Nil {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("get setup session: %w", err)
+	}
+
+	var session service.TotpSetupSession
+	if err := json.Unmarshal(data, &session); err != nil {
+		return nil, fmt.Errorf("unmarshal setup session: %w", err)
+	}
+
+	return &session, nil
+}
+
+// SetSetupSession stores a TOTP setup session
+func (c *TotpCache) SetSetupSession(ctx context.Context, userID int64, session *service.TotpSetupSession, ttl time.Duration) error {
+	key := fmt.Sprintf("%s%d", totpSetupKeyPrefix, userID)
+	data, err := json.Marshal(session)
+	if err != nil {
+		return fmt.Errorf("marshal setup session: %w", err)
+	}
+
+	if err := c.rdb.Set(ctx, key, data, ttl).Err(); err != nil {
+		return fmt.Errorf("set setup session: %w", err)
+	}
+
+	return nil
+}
+
+// DeleteSetupSession deletes a TOTP setup session
+func (c *TotpCache) DeleteSetupSession(ctx context.Context, userID int64) error {
+	key := fmt.Sprintf("%s%d", totpSetupKeyPrefix, userID)
+	return c.rdb.Del(ctx, key).Err()
+}
+
+// GetLoginSession retrieves a TOTP login session
+func (c *TotpCache) GetLoginSession(ctx context.Context, tempToken string) (*service.TotpLoginSession, error) {
+	key := totpLoginKeyPrefix + tempToken
+	data, err := c.rdb.Get(ctx, key).Bytes()
+	if err != nil {
+		if err == redis.Nil {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("get login session: %w", err)
+	}
+
+	var session service.TotpLoginSession
+	if err := json.Unmarshal(data, &session); err != nil {
+		return nil, fmt.Errorf("unmarshal login session: %w", err)
+	}
+
+	return &session, nil
+}
+
+// SetLoginSession stores a TOTP login session
+func (c *TotpCache) SetLoginSession(ctx context.Context, tempToken string, session *service.TotpLoginSession, ttl time.Duration) error {
+	key := totpLoginKeyPrefix + tempToken
+	data, err := json.Marshal(session)
+	if err != nil {
+		return fmt.Errorf("marshal login session: %w", err)
+	}
+
+	if err := c.rdb.Set(ctx, key, data, ttl).Err(); err != nil {
+		return fmt.Errorf("set login session: %w", err)
+	}
+
+	return nil
+}
+
+// DeleteLoginSession deletes a TOTP login session
+func (c *TotpCache) DeleteLoginSession(ctx context.Context, tempToken string) error {
+	key := totpLoginKeyPrefix + tempToken
+	return c.rdb.Del(ctx, key).Err()
+}
+
+// IncrementVerifyAttempts increments the verify attempt counter
+func (c *TotpCache) IncrementVerifyAttempts(ctx context.Context, userID int64) (int, error) {
+	key := fmt.Sprintf("%s%d", totpAttemptsKeyPrefix, userID)
+
+	// Use pipeline for atomic increment and set TTL
+	pipe := c.rdb.Pipeline()
+	incrCmd := pipe.Incr(ctx, key)
+	pipe.Expire(ctx, key, totpAttemptsTTL)
+
+	if _, err := pipe.Exec(ctx); err != nil {
+		return 0, fmt.Errorf("increment verify attempts: %w", err)
+	}
+
+	count, err := incrCmd.Result()
+	if err != nil {
+		return 0, fmt.Errorf("get increment result: %w", err)
+	}
+
+	return int(count), nil
+}
+
+// GetVerifyAttempts gets the current verify attempt count
+func (c *TotpCache) GetVerifyAttempts(ctx context.Context, userID int64) (int, error) {
+	key := fmt.Sprintf("%s%d", totpAttemptsKeyPrefix, userID)
+	count, err := c.rdb.Get(ctx, key).Int()
+	if err != nil {
+		if err == redis.Nil {
+			return 0, nil
+		}
+		return 0, fmt.Errorf("get verify attempts: %w", err)
+	}
+	return count, nil
+}
+
+// ClearVerifyAttempts clears the verify attempt counter
+func (c *TotpCache) ClearVerifyAttempts(ctx context.Context, userID int64) error {
+	key := fmt.Sprintf("%s%d", totpAttemptsKeyPrefix, userID)
+	return c.rdb.Del(ctx, key).Err()
+}

backend/internal/repository/user_repo.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"sort"
 	"strings"
+	"time"
 
 	dbent "github.com/Wei-Shaw/sub2api/ent"
 	dbuser "github.com/Wei-Shaw/sub2api/ent/user"
@@ -466,3 +467,46 @@ func applyUserEntityToService(dst *service.User, src *dbent.User) {
 	dst.CreatedAt = src.CreatedAt
 	dst.UpdatedAt = src.UpdatedAt
 }
+
+// UpdateTotpSecret 更新用户的 TOTP 加密密钥
+func (r *userRepository) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
+	client := clientFromContext(ctx, r.client)
+	update := client.User.UpdateOneID(userID)
+	if encryptedSecret == nil {
+		update = update.ClearTotpSecretEncrypted()
+	} else {
+		update = update.SetTotpSecretEncrypted(*encryptedSecret)
+	}
+	_, err := update.Save(ctx)
+	if err != nil {
+		return translatePersistenceError(err, service.ErrUserNotFound, nil)
+	}
+	return nil
+}
+
+// EnableTotp 启用用户的 TOTP 双因素认证
+func (r *userRepository) EnableTotp(ctx context.Context, userID int64) error {
+	client := clientFromContext(ctx, r.client)
+	_, err := client.User.UpdateOneID(userID).
+		SetTotpEnabled(true).
+		SetTotpEnabledAt(time.Now()).
+		Save(ctx)
+	if err != nil {
+		return translatePersistenceError(err, service.ErrUserNotFound, nil)
+	}
+	return nil
+}
+
+// DisableTotp 禁用用户的 TOTP 双因素认证
+func (r *userRepository) DisableTotp(ctx context.Context, userID int64) error {
+	client := clientFromContext(ctx, r.client)
+	_, err := client.User.UpdateOneID(userID).
+		SetTotpEnabled(false).
+		ClearTotpEnabledAt().
+		ClearTotpSecretEncrypted().
+		Save(ctx)
+	if err != nil {
+		return translatePersistenceError(err, service.ErrUserNotFound, nil)
+	}
+	return nil
+}

backend/internal/repository/wire.go

@@ -82,6 +82,10 @@ var ProviderSet = wire.NewSet(
 	NewSchedulerCache,
 	NewSchedulerOutboxRepository,
 	NewProxyLatencyCache,
+	NewTotpCache,
+
+	// Encryptors
+	NewAESEncryptor,
 
 	// HTTP service ports (DI Strategy A: return interface directly)
 	NewTurnstileVerifier,

backend/internal/server/api_contract_test.go

@@ -453,6 +453,8 @@ func TestAPIContracts(t *testing.T) {
 					"email_verify_enabled": false,
 					"promo_code_enabled": true,
 					"password_reset_enabled": false,
+					"totp_enabled": false,
+					"totp_encryption_key_configured": false,
 					"smtp_host": "smtp.example.com",
 					"smtp_port": 587,
 					"smtp_username": "user",
@@ -596,7 +598,7 @@ func newContractDeps(t *testing.T) *contractDeps {
 	settingService := service.NewSettingService(settingRepo, cfg)
 
 	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil)
-	authHandler := handler.NewAuthHandler(cfg, nil, userService, settingService, nil)
+	authHandler := handler.NewAuthHandler(cfg, nil, userService, settingService, nil, nil)
 	apiKeyHandler := handler.NewAPIKeyHandler(apiKeyService)
 	usageHandler := handler.NewUsageHandler(usageService, apiKeyService)
 	adminSettingHandler := adminhandler.NewSettingHandler(settingService, nil, nil, nil)
@@ -755,6 +757,18 @@ func (r *stubUserRepo) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	return 0, errors.New("not implemented")
 }
 
+func (r *stubUserRepo) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
+	return errors.New("not implemented")
+}
+
+func (r *stubUserRepo) EnableTotp(ctx context.Context, userID int64) error {
+	return errors.New("not implemented")
+}
+
+func (r *stubUserRepo) DisableTotp(ctx context.Context, userID int64) error {
+	return errors.New("not implemented")
+}
+
 type stubApiKeyCache struct{}
 
 func (stubApiKeyCache) GetCreateAttemptCount(ctx context.Context, userID int64) (int, error) {

backend/internal/server/routes/auth.go

@@ -26,6 +26,7 @@ func RegisterAuthRoutes(
 	{
 		auth.POST("/register", h.Auth.Register)
 		auth.POST("/login", h.Auth.Login)
+		auth.POST("/login/2fa", h.Auth.Login2FA)
 		auth.POST("/send-verify-code", h.Auth.SendVerifyCode)
 		// 优惠码验证接口添加速率限制：每分钟最多 10 次（Redis 故障时 fail-close）
 		auth.POST("/validate-promo-code", rateLimiter.LimitWithOptions("validate-promo", 10, time.Minute, middleware.RateLimitOptions{

backend/internal/server/routes/user.go

@@ -22,6 +22,17 @@ func RegisterUserRoutes(
 			user.GET("/profile", h.User.GetProfile)
 			user.PUT("/password", h.User.ChangePassword)
 			user.PUT("", h.User.UpdateProfile)
+
+			// TOTP 双因素认证
+			totp := user.Group("/totp")
+			{
+				totp.GET("/status", h.Totp.GetStatus)
+				totp.GET("/verification-method", h.Totp.GetVerificationMethod)
+				totp.POST("/send-code", h.Totp.SendVerifyCode)
+				totp.POST("/setup", h.Totp.InitiateSetup)
+				totp.POST("/enable", h.Totp.Enable)
+				totp.POST("/disable", h.Totp.Disable)
+			}
 		}
 
 		// API Key管理

backend/internal/service/admin_service_delete_test.go

@@ -93,6 +93,18 @@ func (s *userRepoStub) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	panic("unexpected RemoveGroupFromAllowedGroups call")
 }
 
+func (s *userRepoStub) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
+	panic("unexpected UpdateTotpSecret call")
+}
+
+func (s *userRepoStub) EnableTotp(ctx context.Context, userID int64) error {
+	panic("unexpected EnableTotp call")
+}
+
+func (s *userRepoStub) DisableTotp(ctx context.Context, userID int64) error {
+	panic("unexpected DisableTotp call")
+}
+
 type groupRepoStub struct {
 	affectedUserIDs []int64
 	deleteErr       error

backend/internal/service/domain_constants.go

@@ -88,6 +88,9 @@ const (
 	SettingKeyTurnstileSiteKey   = "turnstile_site_key"   // Turnstile Site Key
 	SettingKeyTurnstileSecretKey = "turnstile_secret_key" // Turnstile Secret Key
 
+	// TOTP 双因素认证设置
+	SettingKeyTotpEnabled = "totp_enabled" // 是否启用 TOTP 2FA 功能
+
 	// LinuxDo Connect OAuth 登录设置
 	SettingKeyLinuxDoConnectEnabled      = "linuxdo_connect_enabled"
 	SettingKeyLinuxDoConnectClientID     = "linuxdo_connect_client_id"

backend/internal/service/email_service.go

@@ -282,8 +282,8 @@ func (s *EmailService) VerifyCode(ctx context.Context, email, code string) error
 		return ErrVerifyCodeMaxAttempts
 	}
 
-	// 验证码不匹配
-	if data.Code != code {
+	// 验证码不匹配 (constant-time comparison to prevent timing attacks)
+	if subtle.ConstantTimeCompare([]byte(data.Code), []byte(code)) != 1 {
 		data.Attempts++
 		if err := s.cache.SetVerificationCode(ctx, email, data, verifyCodeTTL); err != nil {
 			log.Printf("[Email] Failed to update verification attempt count: %v", err)

backend/internal/service/setting_service.go

@@ -62,6 +62,7 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		SettingKeyEmailVerifyEnabled,
 		SettingKeyPromoCodeEnabled,
 		SettingKeyPasswordResetEnabled,
+		SettingKeyTotpEnabled,
 		SettingKeyTurnstileEnabled,
 		SettingKeyTurnstileSiteKey,
 		SettingKeySiteName,
@@ -96,6 +97,7 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		EmailVerifyEnabled:   emailVerifyEnabled,
 		PromoCodeEnabled:     settings[SettingKeyPromoCodeEnabled] != "false", // 默认启用
 		PasswordResetEnabled: passwordResetEnabled,
+		TotpEnabled:          settings[SettingKeyTotpEnabled] == "true",
 		TurnstileEnabled:     settings[SettingKeyTurnstileEnabled] == "true",
 		TurnstileSiteKey:     settings[SettingKeyTurnstileSiteKey],
 		SiteName:             s.getStringOrDefault(settings, SettingKeySiteName, "Sub2API"),
@@ -135,6 +137,7 @@ func (s *SettingService) GetPublicSettingsForInjection(ctx context.Context) (any
 		EmailVerifyEnabled   bool   `json:"email_verify_enabled"`
 		PromoCodeEnabled     bool   `json:"promo_code_enabled"`
 		PasswordResetEnabled bool   `json:"password_reset_enabled"`
+		TotpEnabled          bool   `json:"totp_enabled"`
 		TurnstileEnabled     bool   `json:"turnstile_enabled"`
 		TurnstileSiteKey     string `json:"turnstile_site_key,omitempty"`
 		SiteName             string `json:"site_name"`
@@ -152,6 +155,7 @@ func (s *SettingService) GetPublicSettingsForInjection(ctx context.Context) (any
 		EmailVerifyEnabled:   settings.EmailVerifyEnabled,
 		PromoCodeEnabled:     settings.PromoCodeEnabled,
 		PasswordResetEnabled: settings.PasswordResetEnabled,
+		TotpEnabled:          settings.TotpEnabled,
 		TurnstileEnabled:     settings.TurnstileEnabled,
 		TurnstileSiteKey:     settings.TurnstileSiteKey,
 		SiteName:             settings.SiteName,
@@ -176,6 +180,7 @@ func (s *SettingService) UpdateSettings(ctx context.Context, settings *SystemSet
 	updates[SettingKeyEmailVerifyEnabled] = strconv.FormatBool(settings.EmailVerifyEnabled)
 	updates[SettingKeyPromoCodeEnabled] = strconv.FormatBool(settings.PromoCodeEnabled)
 	updates[SettingKeyPasswordResetEnabled] = strconv.FormatBool(settings.PasswordResetEnabled)
+	updates[SettingKeyTotpEnabled] = strconv.FormatBool(settings.TotpEnabled)
 
 	// 邮件服务设置（只有非空才更新密码）
 	updates[SettingKeySMTPHost] = settings.SMTPHost
@@ -285,6 +290,21 @@ func (s *SettingService) IsPasswordResetEnabled(ctx context.Context) bool {
 	return value == "true"
 }
 
+// IsTotpEnabled 检查是否启用 TOTP 双因素认证功能
+func (s *SettingService) IsTotpEnabled(ctx context.Context) bool {
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyTotpEnabled)
+	if err != nil {
+		return false // 默认关闭
+	}
+	return value == "true"
+}
+
+// IsTotpEncryptionKeyConfigured 检查 TOTP 加密密钥是否已手动配置
+// 只有手动配置了密钥才允许在管理后台启用 TOTP 功能
+func (s *SettingService) IsTotpEncryptionKeyConfigured() bool {
+	return s.cfg.Totp.EncryptionKeyConfigured
+}
+
 // GetSiteName 获取网站名称
 func (s *SettingService) GetSiteName(ctx context.Context) string {
 	value, err := s.settingRepo.GetValue(ctx, SettingKeySiteName)
@@ -369,6 +389,7 @@ func (s *SettingService) parseSettings(settings map[string]string) *SystemSettin
 		EmailVerifyEnabled:           emailVerifyEnabled,
 		PromoCodeEnabled:             settings[SettingKeyPromoCodeEnabled] != "false", // 默认启用
 		PasswordResetEnabled:         emailVerifyEnabled && settings[SettingKeyPasswordResetEnabled] == "true",
+		TotpEnabled:                  settings[SettingKeyTotpEnabled] == "true",
 		SMTPHost:                     settings[SettingKeySMTPHost],
 		SMTPUsername:                 settings[SettingKeySMTPUsername],
 		SMTPFrom:                     settings[SettingKeySMTPFrom],

backend/internal/service/settings_view.go

@@ -5,6 +5,7 @@ type SystemSettings struct {
 	EmailVerifyEnabled   bool
 	PromoCodeEnabled     bool
 	PasswordResetEnabled bool
+	TotpEnabled          bool // TOTP 双因素认证
 
 	SMTPHost               string
 	SMTPPort               int
@@ -62,6 +63,7 @@ type PublicSettings struct {
 	EmailVerifyEnabled   bool
 	PromoCodeEnabled     bool
 	PasswordResetEnabled bool
+	TotpEnabled          bool // TOTP 双因素认证
 	TurnstileEnabled     bool
 	TurnstileSiteKey     string
 	SiteName             string

backend/internal/service/totp_service.go

@@ -0,0 +1,506 @@
+package service
+
+import (
+	"context"
+	"crypto/rand"
+	"crypto/subtle"
+	"encoding/hex"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/pquerna/otp/totp"
+
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
+)
+
+var (
+	ErrTotpNotEnabled      = infraerrors.BadRequest("TOTP_NOT_ENABLED", "totp feature is not enabled")
+	ErrTotpAlreadyEnabled  = infraerrors.BadRequest("TOTP_ALREADY_ENABLED", "totp is already enabled for this account")
+	ErrTotpNotSetup        = infraerrors.BadRequest("TOTP_NOT_SETUP", "totp is not set up for this account")
+	ErrTotpInvalidCode     = infraerrors.BadRequest("TOTP_INVALID_CODE", "invalid totp code")
+	ErrTotpSetupExpired    = infraerrors.BadRequest("TOTP_SETUP_EXPIRED", "totp setup session expired")
+	ErrTotpTooManyAttempts = infraerrors.TooManyRequests("TOTP_TOO_MANY_ATTEMPTS", "too many verification attempts, please try again later")
+	ErrVerifyCodeRequired  = infraerrors.BadRequest("VERIFY_CODE_REQUIRED", "email verification code is required")
+	ErrPasswordRequired    = infraerrors.BadRequest("PASSWORD_REQUIRED", "password is required")
+)
+
+// TotpCache defines cache operations for TOTP service
+type TotpCache interface {
+	// Setup session methods
+	GetSetupSession(ctx context.Context, userID int64) (*TotpSetupSession, error)
+	SetSetupSession(ctx context.Context, userID int64, session *TotpSetupSession, ttl time.Duration) error
+	DeleteSetupSession(ctx context.Context, userID int64) error
+
+	// Login session methods (for 2FA login flow)
+	GetLoginSession(ctx context.Context, tempToken string) (*TotpLoginSession, error)
+	SetLoginSession(ctx context.Context, tempToken string, session *TotpLoginSession, ttl time.Duration) error
+	DeleteLoginSession(ctx context.Context, tempToken string) error
+
+	// Rate limiting
+	IncrementVerifyAttempts(ctx context.Context, userID int64) (int, error)
+	GetVerifyAttempts(ctx context.Context, userID int64) (int, error)
+	ClearVerifyAttempts(ctx context.Context, userID int64) error
+}
+
+// SecretEncryptor defines encryption operations for TOTP secrets
+type SecretEncryptor interface {
+	Encrypt(plaintext string) (string, error)
+	Decrypt(ciphertext string) (string, error)
+}
+
+// TotpSetupSession represents a TOTP setup session
+type TotpSetupSession struct {
+	Secret     string // Plain text TOTP secret (not encrypted yet)
+	SetupToken string // Random token to verify setup request
+	CreatedAt  time.Time
+}
+
+// TotpLoginSession represents a pending 2FA login session
+type TotpLoginSession struct {
+	UserID      int64
+	Email       string
+	TokenExpiry time.Time
+}
+
+// TotpStatus represents the TOTP status for a user
+type TotpStatus struct {
+	Enabled        bool       `json:"enabled"`
+	EnabledAt      *time.Time `json:"enabled_at,omitempty"`
+	FeatureEnabled bool       `json:"feature_enabled"`
+}
+
+// TotpSetupResponse represents the response for initiating TOTP setup
+type TotpSetupResponse struct {
+	Secret     string `json:"secret"`
+	QRCodeURL  string `json:"qr_code_url"`
+	SetupToken string `json:"setup_token"`
+	Countdown  int    `json:"countdown"` // seconds until setup expires
+}
+
+const (
+	totpSetupTTL    = 5 * time.Minute
+	totpLoginTTL    = 5 * time.Minute
+	totpAttemptsTTL = 15 * time.Minute
+	maxTotpAttempts = 5
+	totpIssuer      = "Sub2API"
+)
+
+// TotpService handles TOTP operations
+type TotpService struct {
+	userRepo          UserRepository
+	encryptor         SecretEncryptor
+	cache             TotpCache
+	settingService    *SettingService
+	emailService      *EmailService
+	emailQueueService *EmailQueueService
+}
+
+// NewTotpService creates a new TOTP service
+func NewTotpService(
+	userRepo UserRepository,
+	encryptor SecretEncryptor,
+	cache TotpCache,
+	settingService *SettingService,
+	emailService *EmailService,
+	emailQueueService *EmailQueueService,
+) *TotpService {
+	return &TotpService{
+		userRepo:          userRepo,
+		encryptor:         encryptor,
+		cache:             cache,
+		settingService:    settingService,
+		emailService:      emailService,
+		emailQueueService: emailQueueService,
+	}
+}
+
+// GetStatus returns the TOTP status for a user
+func (s *TotpService) GetStatus(ctx context.Context, userID int64) (*TotpStatus, error) {
+	featureEnabled := s.settingService.IsTotpEnabled(ctx)
+
+	user, err := s.userRepo.GetByID(ctx, userID)
+	if err != nil {
+		return nil, fmt.Errorf("get user: %w", err)
+	}
+
+	return &TotpStatus{
+		Enabled:        user.TotpEnabled,
+		EnabledAt:      user.TotpEnabledAt,
+		FeatureEnabled: featureEnabled,
+	}, nil
+}
+
+// InitiateSetup starts the TOTP setup process
+// If email verification is enabled, emailCode is required; otherwise password is required
+func (s *TotpService) InitiateSetup(ctx context.Context, userID int64, emailCode, password string) (*TotpSetupResponse, error) {
+	// Check if TOTP feature is enabled globally
+	if !s.settingService.IsTotpEnabled(ctx) {
+		return nil, ErrTotpNotEnabled
+	}
+
+	// Get user and check if TOTP is already enabled
+	user, err := s.userRepo.GetByID(ctx, userID)
+	if err != nil {
+		return nil, fmt.Errorf("get user: %w", err)
+	}
+
+	if user.TotpEnabled {
+		return nil, ErrTotpAlreadyEnabled
+	}
+
+	// Verify identity based on email verification setting
+	if s.settingService.IsEmailVerifyEnabled(ctx) {
+		// Email verification enabled - verify email code
+		if emailCode == "" {
+			return nil, ErrVerifyCodeRequired
+		}
+		if err := s.emailService.VerifyCode(ctx, user.Email, emailCode); err != nil {
+			return nil, err
+		}
+	} else {
+		// Email verification disabled - verify password
+		if password == "" {
+			return nil, ErrPasswordRequired
+		}
+		if !user.CheckPassword(password) {
+			return nil, ErrPasswordIncorrect
+		}
+	}
+
+	// Generate a new TOTP key
+	key, err := totp.Generate(totp.GenerateOpts{
+		Issuer:      totpIssuer,
+		AccountName: user.Email,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("generate totp key: %w", err)
+	}
+
+	// Generate a random setup token
+	setupToken, err := generateRandomToken(32)
+	if err != nil {
+		return nil, fmt.Errorf("generate setup token: %w", err)
+	}
+
+	// Store the setup session in cache
+	session := &TotpSetupSession{
+		Secret:     key.Secret(),
+		SetupToken: setupToken,
+		CreatedAt:  time.Now(),
+	}
+
+	if err := s.cache.SetSetupSession(ctx, userID, session, totpSetupTTL); err != nil {
+		return nil, fmt.Errorf("store setup session: %w", err)
+	}
+
+	return &TotpSetupResponse{
+		Secret:     key.Secret(),
+		QRCodeURL:  key.URL(),
+		SetupToken: setupToken,
+		Countdown:  int(totpSetupTTL.Seconds()),
+	}, nil
+}
+
+// CompleteSetup completes the TOTP setup by verifying the code
+func (s *TotpService) CompleteSetup(ctx context.Context, userID int64, totpCode, setupToken string) error {
+	// Check if TOTP feature is enabled globally
+	if !s.settingService.IsTotpEnabled(ctx) {
+		return ErrTotpNotEnabled
+	}
+
+	// Get the setup session
+	session, err := s.cache.GetSetupSession(ctx, userID)
+	if err != nil {
+		return ErrTotpSetupExpired
+	}
+
+	if session == nil {
+		return ErrTotpSetupExpired
+	}
+
+	// Verify the setup token (constant-time comparison)
+	if subtle.ConstantTimeCompare([]byte(session.SetupToken), []byte(setupToken)) != 1 {
+		return ErrTotpSetupExpired
+	}
+
+	// Verify the TOTP code
+	if !totp.Validate(totpCode, session.Secret) {
+		return ErrTotpInvalidCode
+	}
+
+	setupSecretPrefix := "N/A"
+	if len(session.Secret) >= 4 {
+		setupSecretPrefix = session.Secret[:4]
+	}
+	slog.Debug("totp_complete_setup_before_encrypt",
+		"user_id", userID,
+		"secret_len", len(session.Secret),
+		"secret_prefix", setupSecretPrefix)
+
+	// Encrypt the secret
+	encryptedSecret, err := s.encryptor.Encrypt(session.Secret)
+	if err != nil {
+		return fmt.Errorf("encrypt totp secret: %w", err)
+	}
+
+	slog.Debug("totp_complete_setup_encrypted",
+		"user_id", userID,
+		"encrypted_len", len(encryptedSecret))
+
+	// Verify encryption by decrypting
+	decrypted, decErr := s.encryptor.Decrypt(encryptedSecret)
+	if decErr != nil {
+		slog.Debug("totp_complete_setup_verify_failed",
+			"user_id", userID,
+			"error", decErr)
+	} else {
+		decryptedPrefix := "N/A"
+		if len(decrypted) >= 4 {
+			decryptedPrefix = decrypted[:4]
+		}
+		slog.Debug("totp_complete_setup_verified",
+			"user_id", userID,
+			"original_len", len(session.Secret),
+			"decrypted_len", len(decrypted),
+			"match", session.Secret == decrypted,
+			"decrypted_prefix", decryptedPrefix)
+	}
+
+	// Update user with encrypted TOTP secret
+	if err := s.userRepo.UpdateTotpSecret(ctx, userID, &encryptedSecret); err != nil {
+		return fmt.Errorf("update totp secret: %w", err)
+	}
+
+	// Enable TOTP for the user
+	if err := s.userRepo.EnableTotp(ctx, userID); err != nil {
+		return fmt.Errorf("enable totp: %w", err)
+	}
+
+	// Clean up the setup session
+	_ = s.cache.DeleteSetupSession(ctx, userID)
+
+	return nil
+}
+
+// Disable disables TOTP for a user
+// If email verification is enabled, emailCode is required; otherwise password is required
+func (s *TotpService) Disable(ctx context.Context, userID int64, emailCode, password string) error {
+	// Get user
+	user, err := s.userRepo.GetByID(ctx, userID)
+	if err != nil {
+		return fmt.Errorf("get user: %w", err)
+	}
+
+	if !user.TotpEnabled {
+		return ErrTotpNotSetup
+	}
+
+	// Verify identity based on email verification setting
+	if s.settingService.IsEmailVerifyEnabled(ctx) {
+		// Email verification enabled - verify email code
+		if emailCode == "" {
+			return ErrVerifyCodeRequired
+		}
+		if err := s.emailService.VerifyCode(ctx, user.Email, emailCode); err != nil {
+			return err
+		}
+	} else {
+		// Email verification disabled - verify password
+		if password == "" {
+			return ErrPasswordRequired
+		}
+		if !user.CheckPassword(password) {
+			return ErrPasswordIncorrect
+		}
+	}
+
+	// Disable TOTP
+	if err := s.userRepo.DisableTotp(ctx, userID); err != nil {
+		return fmt.Errorf("disable totp: %w", err)
+	}
+
+	return nil
+}
+
+// VerifyCode verifies a TOTP code for a user
+func (s *TotpService) VerifyCode(ctx context.Context, userID int64, code string) error {
+	slog.Debug("totp_verify_code_called",
+		"user_id", userID,
+		"code_len", len(code))
+
+	// Check rate limiting
+	attempts, err := s.cache.GetVerifyAttempts(ctx, userID)
+	if err == nil && attempts >= maxTotpAttempts {
+		return ErrTotpTooManyAttempts
+	}
+
+	// Get user
+	user, err := s.userRepo.GetByID(ctx, userID)
+	if err != nil {
+		slog.Debug("totp_verify_get_user_failed",
+			"user_id", userID,
+			"error", err)
+		return infraerrors.InternalServer("TOTP_VERIFY_ERROR", "failed to verify totp code")
+	}
+
+	if !user.TotpEnabled || user.TotpSecretEncrypted == nil {
+		slog.Debug("totp_verify_not_setup",
+			"user_id", userID,
+			"enabled", user.TotpEnabled,
+			"has_secret", user.TotpSecretEncrypted != nil)
+		return ErrTotpNotSetup
+	}
+
+	slog.Debug("totp_verify_encrypted_secret",
+		"user_id", userID,
+		"encrypted_len", len(*user.TotpSecretEncrypted))
+
+	// Decrypt the secret
+	secret, err := s.encryptor.Decrypt(*user.TotpSecretEncrypted)
+	if err != nil {
+		slog.Debug("totp_verify_decrypt_failed",
+			"user_id", userID,
+			"error", err)
+		return infraerrors.InternalServer("TOTP_VERIFY_ERROR", "failed to verify totp code")
+	}
+
+	secretPrefix := "N/A"
+	if len(secret) >= 4 {
+		secretPrefix = secret[:4]
+	}
+	slog.Debug("totp_verify_decrypted",
+		"user_id", userID,
+		"secret_len", len(secret),
+		"secret_prefix", secretPrefix)
+
+	// Verify the code
+	valid := totp.Validate(code, secret)
+	slog.Debug("totp_verify_result",
+		"user_id", userID,
+		"valid", valid,
+		"secret_len", len(secret),
+		"secret_prefix", secretPrefix,
+		"server_time", time.Now().UTC().Format(time.RFC3339))
+
+	if !valid {
+		// Increment failed attempts
+		_, _ = s.cache.IncrementVerifyAttempts(ctx, userID)
+		return ErrTotpInvalidCode
+	}
+
+	// Clear attempt counter on success
+	_ = s.cache.ClearVerifyAttempts(ctx, userID)
+
+	return nil
+}
+
+// CreateLoginSession creates a temporary login session for 2FA
+func (s *TotpService) CreateLoginSession(ctx context.Context, userID int64, email string) (string, error) {
+	// Generate a random temp token
+	tempToken, err := generateRandomToken(32)
+	if err != nil {
+		return "", fmt.Errorf("generate temp token: %w", err)
+	}
+
+	session := &TotpLoginSession{
+		UserID:      userID,
+		Email:       email,
+		TokenExpiry: time.Now().Add(totpLoginTTL),
+	}
+
+	if err := s.cache.SetLoginSession(ctx, tempToken, session, totpLoginTTL); err != nil {
+		return "", fmt.Errorf("store login session: %w", err)
+	}
+
+	return tempToken, nil
+}
+
+// GetLoginSession retrieves a login session
+func (s *TotpService) GetLoginSession(ctx context.Context, tempToken string) (*TotpLoginSession, error) {
+	return s.cache.GetLoginSession(ctx, tempToken)
+}
+
+// DeleteLoginSession deletes a login session
+func (s *TotpService) DeleteLoginSession(ctx context.Context, tempToken string) error {
+	return s.cache.DeleteLoginSession(ctx, tempToken)
+}
+
+// IsTotpEnabledForUser checks if TOTP is enabled for a specific user
+func (s *TotpService) IsTotpEnabledForUser(ctx context.Context, userID int64) (bool, error) {
+	user, err := s.userRepo.GetByID(ctx, userID)
+	if err != nil {
+		return false, fmt.Errorf("get user: %w", err)
+	}
+	return user.TotpEnabled, nil
+}
+
+// MaskEmail masks an email address for display
+func MaskEmail(email string) string {
+	if len(email) < 3 {
+		return "***"
+	}
+
+	atIdx := -1
+	for i, c := range email {
+		if c == '@' {
+			atIdx = i
+			break
+		}
+	}
+
+	if atIdx == -1 || atIdx < 1 {
+		return email[:1] + "***"
+	}
+
+	localPart := email[:atIdx]
+	domain := email[atIdx:]
+
+	if len(localPart) <= 2 {
+		return localPart[:1] + "***" + domain
+	}
+
+	return localPart[:1] + "***" + localPart[len(localPart)-1:] + domain
+}
+
+// generateRandomToken generates a random hex-encoded token
+func generateRandomToken(byteLength int) (string, error) {
+	b := make([]byte, byteLength)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(b), nil
+}
+
+// VerificationMethod represents the method required for TOTP operations
+type VerificationMethod struct {
+	Method string `json:"method"` // "email" or "password"
+}
+
+// GetVerificationMethod returns the verification method for TOTP operations
+func (s *TotpService) GetVerificationMethod(ctx context.Context) *VerificationMethod {
+	if s.settingService.IsEmailVerifyEnabled(ctx) {
+		return &VerificationMethod{Method: "email"}
+	}
+	return &VerificationMethod{Method: "password"}
+}
+
+// SendVerifyCode sends an email verification code for TOTP operations
+func (s *TotpService) SendVerifyCode(ctx context.Context, userID int64) error {
+	// Check if email verification is enabled
+	if !s.settingService.IsEmailVerifyEnabled(ctx) {
+		return infraerrors.BadRequest("EMAIL_VERIFY_NOT_ENABLED", "email verification is not enabled")
+	}
+
+	// Get user email
+	user, err := s.userRepo.GetByID(ctx, userID)
+	if err != nil {
+		return fmt.Errorf("get user: %w", err)
+	}
+
+	// Get site name for email
+	siteName := s.settingService.GetSiteName(ctx)
+
+	// Send verification code via queue
+	return s.emailQueueService.EnqueueVerifyCode(user.Email, siteName)
+}

backend/internal/service/user.go

@@ -21,6 +21,11 @@ type User struct {
 	CreatedAt     time.Time
 	UpdatedAt     time.Time
 
+	// TOTP 双因素认证字段
+	TotpSecretEncrypted *string    // AES-256-GCM 加密的 TOTP 密钥
+	TotpEnabled         bool       // 是否启用 TOTP
+	TotpEnabledAt       *time.Time // TOTP 启用时间
+
 	APIKeys       []APIKey
 	Subscriptions []UserSubscription
 }

backend/internal/service/user_service.go

@@ -38,6 +38,11 @@ type UserRepository interface {
 	UpdateConcurrency(ctx context.Context, id int64, amount int) error
 	ExistsByEmail(ctx context.Context, email string) (bool, error)
 	RemoveGroupFromAllowedGroups(ctx context.Context, groupID int64) (int64, error)
+
+	// TOTP 相关方法
+	UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error
+	EnableTotp(ctx context.Context, userID int64) error
+	DisableTotp(ctx context.Context, userID int64) error
 }
 
 // UpdateProfileRequest 更新用户资料请求

backend/internal/service/wire.go

@@ -271,4 +271,5 @@ var ProviderSet = wire.NewSet(
 	NewAntigravityQuotaFetcher,
 	NewUserAttributeService,
 	NewUsageCache,
+	NewTotpService,
 )

backend/migrations/044_add_user_totp.sql

@@ -0,0 +1,12 @@
+-- 为 users 表添加 TOTP 双因素认证字段
+ALTER TABLE users
+  ADD COLUMN IF NOT EXISTS totp_secret_encrypted TEXT DEFAULT NULL,
+  ADD COLUMN IF NOT EXISTS totp_enabled BOOLEAN NOT NULL DEFAULT FALSE,
+  ADD COLUMN IF NOT EXISTS totp_enabled_at TIMESTAMPTZ DEFAULT NULL;
+
+COMMENT ON COLUMN users.totp_secret_encrypted IS 'AES-256-GCM 加密的 TOTP 密钥';
+COMMENT ON COLUMN users.totp_enabled IS '是否启用 TOTP 双因素认证';
+COMMENT ON COLUMN users.totp_enabled_at IS 'TOTP 启用时间';
+
+-- 创建索引以支持快速查询启用 2FA 的用户
+CREATE INDEX IF NOT EXISTS idx_users_totp_enabled ON users(totp_enabled) WHERE deleted_at IS NULL AND totp_enabled = true;