rpc: return PASSWORD_MISSING for channel transfer without 2FA

messages.editChatCreator unconditionally returned PASSWORD_HASH_INVALID for
an account with no cloud password at all. Real Telegram Desktop's transfer-
ownership flow only recognizes the distinct PASSWORD_MISSING error to show
its "enable 2FA first" box; anything else falls through into the real
password-entry flow, which then has nothing to check against and crashes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/domain/account.go

@@ -11,6 +11,7 @@ import (
 
 var (
 	ErrPasswordHashInvalid     = errors.New("password hash invalid")
+	ErrPasswordMissing         = errors.New("password missing")
 	ErrSRPIDInvalid            = errors.New("srp id invalid")
 	ErrSRPPasswordChanged      = errors.New("srp password changed")
 	ErrNewSettingsInvalid      = errors.New("new password settings invalid")

internal/rpc/channels_leave_rpc_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/iamxvbaba/td/tgerr"
 	"go.uber.org/zap/zaptest"
 
+	appaccount "telesrv/internal/app/account"
 	appchannels "telesrv/internal/app/channels"
 	appusers "telesrv/internal/app/users"
 	"telesrv/internal/domain"
@@ -26,6 +27,10 @@ func (acceptPasswordAccountService) CheckPassword(_ context.Context, _ int64, ch
 	return nil
 }
 
+func (acceptPasswordAccountService) GetPassword(_ context.Context, _ int64) (domain.PasswordSettings, error) {
+	return domain.PasswordSettings{HasPassword: true}, nil
+}
+
 func TestMessagesGetFutureChatCreatorAfterLeaveAndCreatorLeaveTransfers(t *testing.T) {
 	ctx := context.Background()
 	userStore := memory.NewUserStore()
@@ -242,6 +247,58 @@ func TestMessagesEditChatCreatorTransfersWithoutChannelPts(t *testing.T) {
 	}
 }
 
+// TestMessagesEditChatCreatorRequiresPasswordSetup covers an owner who has never
+// enabled two-step verification: the client's transfer-ownership probe
+// (inputUserEmpty + inputCheckPasswordEmpty) must get PASSWORD_MISSING, not
+// PASSWORD_HASH_INVALID -- the desktop client only recognizes PASSWORD_MISSING
+// to show its "enable 2FA first" box, and otherwise falls through into a real
+// password-entry flow it can't satisfy.
+func TestMessagesEditChatCreatorRequiresPasswordSetup(t *testing.T) {
+	ctx := context.Background()
+	userStore := memory.NewUserStore()
+	owner, err := userStore.Create(ctx, domain.User{AccessHash: 9221, Phone: "15550009221", FirstName: "Owner"})
+	if err != nil {
+		t.Fatalf("create owner: %v", err)
+	}
+	member, err := userStore.Create(ctx, domain.User{AccessHash: 9222, Phone: "15550009222", FirstName: "Member"})
+	if err != nil {
+		t.Fatalf("create member: %v", err)
+	}
+	channelStore := memory.NewChannelStore()
+	channelService := appchannels.NewService(channelStore)
+	r := New(Config{}, Deps{
+		Account:  appaccount.NewService(memory.NewPasswordStore()),
+		Users:    appusers.NewService(userStore),
+		Channels: channelService,
+	}, zaptest.NewLogger(t), fixedClock{now: time.Unix(1700009130, 0)})
+	created, err := channelService.CreateChannel(ctx, owner.ID, domain.CreateChannelRequest{
+		CreatorUserID: owner.ID,
+		Title:         "no password owner",
+		Megagroup:     true,
+		MemberUserIDs: []int64{member.ID},
+		Date:          1700009130,
+	})
+	if err != nil {
+		t.Fatalf("create channel: %v", err)
+	}
+	ownerCtx := WithUserID(ctx, owner.ID)
+	peer := &tg.InputPeerChannel{ChannelID: created.Channel.ID, AccessHash: created.Channel.AccessHash}
+	if _, err := r.onMessagesEditChatCreator(ownerCtx, &tg.MessagesEditChatCreatorRequest{
+		Peer:     peer,
+		UserID:   &tg.InputUserEmpty{},
+		Password: &tg.InputCheckPasswordEmpty{},
+	}); err == nil || !tgerr.Is(err, "PASSWORD_MISSING") {
+		t.Fatalf("editChatCreator probe err = %v, want PASSWORD_MISSING", err)
+	}
+	if _, err := r.onMessagesEditChatCreator(ownerCtx, &tg.MessagesEditChatCreatorRequest{
+		Peer:     peer,
+		UserID:   &tg.InputUser{UserID: member.ID, AccessHash: member.AccessHash},
+		Password: &tg.InputCheckPasswordSRP{SRPID: 1, A: []byte{1}, M1: []byte{2}},
+	}); err == nil || !tgerr.Is(err, "PASSWORD_MISSING") {
+		t.Fatalf("editChatCreator transfer err = %v, want PASSWORD_MISSING", err)
+	}
+}
+
 func TestMessagesGetFutureChatCreatorAfterLeaveNoCandidate(t *testing.T) {
 	ctx := context.Background()
 	userStore := memory.NewUserStore()

internal/rpc/channels_legacy_chat.go

@@ -339,6 +339,20 @@ func (r *Router) onMessagesEditChatCreator(ctx context.Context, req *tg.Messages
 	if req.Password == nil {
 		return nil, passwordHashInvalidErr()
 	}
+	if r.deps.Account == nil {
+		return nil, passwordHashInvalidErr()
+	}
+	// 转让所有权无条件要求已开启两步验证：先探测账号是否设有密码，
+	// 让 messages.editChatCreator 的探测请求（inputUserEmpty + inputCheckPasswordEmpty）
+	// 拿到 PASSWORD_MISSING 而非 PASSWORD_HASH_INVALID —— 客户端只识别前者来展示
+	// “请先开启两步验证”提示，否则会误入真实密码校验流程并在没有密码可核对时崩溃。
+	passwordSettings, err := r.deps.Account.GetPassword(ctx, userID)
+	if err != nil {
+		return nil, internalErr()
+	}
+	if !passwordSettings.HasPassword {
+		return nil, passwordMissingErr()
+	}
 	if _, ok := req.UserID.(*tg.InputUserEmpty); ok {
 		return nil, passwordHashInvalidErr()
 	}
@@ -355,9 +369,6 @@ func (r *Router) onMessagesEditChatCreator(ctx context.Context, req *tg.Messages
 	if target.Bot {
 		return nil, userIDInvalidErr()
 	}
-	if r.deps.Account == nil {
-		return nil, passwordHashInvalidErr()
-	}
 	if err := r.deps.Account.CheckPassword(ctx, userID, domainPasswordCheck(req.Password)); err != nil {
 		return nil, passwordErr(err)
 	}

internal/rpc/errors.go

@@ -302,6 +302,7 @@ func scoreInvalidErr() error { return tgerr.New(400, "SCORE_INVALID") }
 
 func sessionPasswordNeededErr() error { return tgerr.New(401, "SESSION_PASSWORD_NEEDED") }
 func passwordHashInvalidErr() error   { return tgerr.New(400, "PASSWORD_HASH_INVALID") }
+func passwordMissingErr() error       { return tgerr.New(400, "PASSWORD_MISSING") }
 func srpIDInvalidErr() error          { return tgerr.New(400, "SRP_ID_INVALID") }
 func srpPasswordChangedErr() error    { return tgerr.New(400, "SRP_PASSWORD_CHANGED") }
 func newSettingsInvalidErr() error    { return tgerr.New(400, "NEW_SETTINGS_INVALID") }
@@ -488,6 +489,8 @@ func passwordErr(err error) error {
 	switch {
 	case errors.Is(err, domain.ErrPasswordHashInvalid):
 		return passwordHashInvalidErr()
+	case errors.Is(err, domain.ErrPasswordMissing):
+		return passwordMissingErr()
 	case errors.Is(err, domain.ErrSRPIDInvalid):
 		return srpIDInvalidErr()
 	case errors.Is(err, domain.ErrSRPPasswordChanged):