feat(admin): 完整实现管理员修改用户 API Key 分组的功能

## 核心功能 - 添加 AdminUpdateAPIKeyGroupID 服务方法，支持绑定/解绑/保持不变三态语义 - 实现 UserRepository.AddGroupToAllowedGroups 接口，自动同步专属分组权限 - 添加 HTTP PUT /api-keys/:id handler 端点，支持管理员直接修改 API Key 分组 ## 事务一致性 - 使用 ent Tx 保证专属分组绑定时「添加权限」和「更新 Key」的原子性 - Repository 方法支持 clientFromContext，兼容事务内调用 - 事务失败时自动回滚，避免权限孤立 ## 业务逻辑 - 订阅类型分组阻断，需通过订阅管理流程 - 非活跃分组拒绝绑定 - 负 ID 和非法 ID 验证 - 自动授权响应，告知管理员成功授权的分组 ## 代码质量 - 16 个单元测试覆盖所有业务路径和边界用例 - 7 个 handler 集成测试覆盖 HTTP 层 - GroupRepo stub 返回克隆副本，防止测试间数据泄漏 - API 类型安全修复（PaginatedResponse<ApiKey>） - 前端 ref 回调类型对齐 Vue 规范 ## 国际化支持 - 中英文提示信息完整 - 自动授权成功/失败提示
2026-02-28 17:33:30 +08:00
parent 000e621eb6
commit 9a91815b94
18 changed files with 302 additions and 55 deletions
--- a/backend/internal/handler/admin/admin_service_stub_test.go
+++ b/backend/internal/handler/admin/admin_service_stub_test.go
@@ -403,7 +403,7 @@ func (s *stubAdminService) UpdateGroupSortOrders(ctx context.Context, updates []
 	return nil
 }

-func (s *stubAdminService) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*service.APIKey, error) {
+func (s *stubAdminService) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*service.AdminUpdateAPIKeyGroupIDResult, error) {
 	for i := range s.apiKeys {
 		if s.apiKeys[i].ID == keyID {
 			k := s.apiKeys[i]
@@ -415,7 +415,7 @@ func (s *stubAdminService) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID i
 					k.GroupID = &gid
 				}
 			}
-			return &k, nil
+			return &service.AdminUpdateAPIKeyGroupIDResult{APIKey: &k}, nil
 		}
 	}
 	return nil, service.ErrAPIKeyNotFound
--- a/backend/internal/handler/admin/apikey_handler.go
+++ b/backend/internal/handler/admin/apikey_handler.go
@@ -42,11 +42,22 @@ func (h *AdminAPIKeyHandler) UpdateGroup(c *gin.Context) {
 		return
 	}

-	apiKey, err := h.adminService.AdminUpdateAPIKeyGroupID(c.Request.Context(), keyID, req.GroupID)
+	result, err := h.adminService.AdminUpdateAPIKeyGroupID(c.Request.Context(), keyID, req.GroupID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, dto.APIKeyFromService(apiKey))
+	resp := struct {
+		APIKey                 *dto.APIKey `json:"api_key"`
+		AutoGrantedGroupAccess bool        `json:"auto_granted_group_access"`
+		GrantedGroupID         *int64      `json:"granted_group_id,omitempty"`
+		GrantedGroupName       string      `json:"granted_group_name,omitempty"`
+	}{
+		APIKey:                 dto.APIKeyFromService(result.APIKey),
+		AutoGrantedGroupAccess: result.AutoGrantedGroupAccess,
+		GrantedGroupID:         result.GrantedGroupID,
+		GrantedGroupName:       result.GrantedGroupName,
+	}
+	response.Success(c, resp)
 }
--- a/backend/internal/handler/admin/apikey_handler_test.go
+++ b/backend/internal/handler/admin/apikey_handler_test.go
@@ -79,14 +79,17 @@ func TestAdminAPIKeyHandler_UpdateGroup_BindGroup(t *testing.T) {
 	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
 	require.Equal(t, 0, resp.Code)

-	var apiKey struct {
-		ID      int64  `json:"id"`
-		GroupID *int64 `json:"group_id"`
+	var data struct {
+		APIKey struct {
+			ID      int64  `json:"id"`
+			GroupID *int64 `json:"group_id"`
+		} `json:"api_key"`
+		AutoGrantedGroupAccess bool `json:"auto_granted_group_access"`
 	}
-	require.NoError(t, json.Unmarshal(resp.Data, &apiKey))
-	require.Equal(t, int64(10), apiKey.ID)
-	require.NotNil(t, apiKey.GroupID)
-	require.Equal(t, int64(2), *apiKey.GroupID)
+	require.NoError(t, json.Unmarshal(resp.Data, &data))
+	require.Equal(t, int64(10), data.APIKey.ID)
+	require.NotNil(t, data.APIKey.GroupID)
+	require.Equal(t, int64(2), *data.APIKey.GroupID)
 }

 func TestAdminAPIKeyHandler_UpdateGroup_Unbind(t *testing.T) {
@@ -105,11 +108,13 @@ func TestAdminAPIKeyHandler_UpdateGroup_Unbind(t *testing.T) {

 	var resp struct {
 		Data struct {
-			GroupID *int64 `json:"group_id"`
+			APIKey struct {
+				GroupID *int64 `json:"group_id"`
+			} `json:"api_key"`
 		} `json:"data"`
 	}
 	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
-	require.Nil(t, resp.Data.GroupID)
+	require.Nil(t, resp.Data.APIKey.GroupID)
 }

 func TestAdminAPIKeyHandler_UpdateGroup_ServiceError(t *testing.T) {
@@ -142,12 +147,14 @@ func TestAdminAPIKeyHandler_UpdateGroup_EmptyBody_NoChange(t *testing.T) {
 	var resp struct {
 		Code int `json:"code"`
 		Data struct {
-			ID int64 `json:"id"`
+			APIKey struct {
+				ID int64 `json:"id"`
+			} `json:"api_key"`
 		} `json:"data"`
 	}
 	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
 	require.Equal(t, 0, resp.Code)
-	require.Equal(t, int64(10), resp.Data.ID)
+	require.Equal(t, int64(10), resp.Data.APIKey.ID)
 }

 // M2: service returns GROUP_NOT_ACTIVE → handler maps to 400
@@ -190,6 +197,6 @@ type failingUpdateGroupService struct {
 	err error
 }

-func (f *failingUpdateGroupService) AdminUpdateAPIKeyGroupID(_ context.Context, _ int64, _ *int64) (*service.APIKey, error) {
+func (f *failingUpdateGroupService) AdminUpdateAPIKeyGroupID(_ context.Context, _ int64, _ *int64) (*service.AdminUpdateAPIKeyGroupIDResult, error) {
 	return nil, f.err
 }
--- a/backend/internal/repository/api_key_repo.go
+++ b/backend/internal/repository/api_key_repo.go
@@ -171,8 +171,9 @@ func (r *apiKeyRepository) Update(ctx context.Context, key *service.APIKey) erro
 	// 则会更新已删除的记录。
 	// 这里选择 Update().Where()，确保只有未软删除记录能被更新。
 	// 同时显式设置 updated_at，避免二次查询带来的并发可见性问题。
+	client := clientFromContext(ctx, r.client)
 	now := time.Now()
-	builder := r.client.APIKey.Update().
+	builder := client.APIKey.Update().
 		Where(apikey.IDEQ(key.ID), apikey.DeletedAtIsNil()).
 		SetName(key.Name).
 		SetStatus(key.Status).
--- a/backend/internal/repository/user_repo.go
+++ b/backend/internal/repository/user_repo.go
@@ -429,6 +429,16 @@ func (r *userRepository) ExistsByEmail(ctx context.Context, email string) (bool,
 	return r.client.User.Query().Where(dbuser.EmailEQ(email)).Exist(ctx)
 }

+func (r *userRepository) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	client := clientFromContext(ctx, r.client)
+	return client.UserAllowedGroup.Create().
+		SetUserID(userID).
+		SetGroupID(groupID).
+		OnConflictColumns(userallowedgroup.FieldUserID, userallowedgroup.FieldGroupID).
+		DoNothing().
+		Exec(ctx)
+}
+
 func (r *userRepository) RemoveGroupFromAllowedGroups(ctx context.Context, groupID int64) (int64, error) {
 	// 仅操作 user_allowed_groups 联接表，legacy users.allowed_groups 列已弃用。
 	affected, err := r.client.UserAllowedGroup.Delete().
--- a/backend/internal/server/api_contract_test.go
+++ b/backend/internal/server/api_contract_test.go
@@ -619,7 +619,7 @@ func newContractDeps(t *testing.T) *contractDeps {
 	settingRepo := newStubSettingRepo()
 	settingService := service.NewSettingService(settingRepo, cfg)

-	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, nil, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil)
+	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, nil, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil, nil)
 	authHandler := handler.NewAuthHandler(cfg, nil, userService, settingService, nil, redeemService, nil)
 	apiKeyHandler := handler.NewAPIKeyHandler(apiKeyService)
 	usageHandler := handler.NewUsageHandler(usageService, apiKeyService)
@@ -779,6 +779,10 @@ func (r *stubUserRepo) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	return 0, errors.New("not implemented")
 }

+func (r *stubUserRepo) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	return errors.New("not implemented")
+}
+
 func (r *stubUserRepo) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
 	return errors.New("not implemented")
 }
--- a/backend/internal/server/middleware/admin_auth_test.go
+++ b/backend/internal/server/middleware/admin_auth_test.go
@@ -181,6 +181,10 @@ func (s *stubUserRepo) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	panic("unexpected RemoveGroupFromAllowedGroups call")
 }

+func (s *stubUserRepo) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	panic("unexpected AddGroupToAllowedGroups call")
+}
+
 func (s *stubUserRepo) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
 	panic("unexpected UpdateTotpSecret call")
 }
--- a/backend/internal/service/admin_service.go
+++ b/backend/internal/service/admin_service.go
@@ -9,6 +9,7 @@ import (
 	"strings"
 	"time"

+	dbent "github.com/Wei-Shaw/sub2api/ent"
 	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/httpclient"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/logger"
@@ -44,7 +45,7 @@ type AdminService interface {
 	UpdateGroupSortOrders(ctx context.Context, updates []GroupSortOrderUpdate) error

 	// API Key management (admin)
-	AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*APIKey, error)
+	AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*AdminUpdateAPIKeyGroupIDResult, error)

 	// Account management
 	ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string, groupID int64) ([]Account, int64, error)
@@ -246,6 +247,14 @@ type BulkUpdateAccountResult struct {
 	Error     string `json:"error,omitempty"`
 }

+// AdminUpdateAPIKeyGroupIDResult is the result of AdminUpdateAPIKeyGroupID.
+type AdminUpdateAPIKeyGroupIDResult struct {
+	APIKey                 *APIKey
+	AutoGrantedGroupAccess bool   // true if a new exclusive group permission was auto-added
+	GrantedGroupID         *int64 // the group ID that was auto-granted
+	GrantedGroupName       string // the group name that was auto-granted
+}
+
 // BulkUpdateAccountsResult is the aggregated response for bulk updates.
 type BulkUpdateAccountsResult struct {
 	Success    int                       `json:"success"`
@@ -410,6 +419,7 @@ type adminServiceImpl struct {
 	proxyProber          ProxyExitInfoProber
 	proxyLatencyCache    ProxyLatencyCache
 	authCacheInvalidator APIKeyAuthCacheInvalidator
+	entClient            *dbent.Client // 用于开启数据库事务
 }

 type userGroupRateBatchReader interface {
@@ -434,6 +444,7 @@ func NewAdminService(
 	proxyProber ProxyExitInfoProber,
 	proxyLatencyCache ProxyLatencyCache,
 	authCacheInvalidator APIKeyAuthCacheInvalidator,
+	entClient *dbent.Client,
 ) AdminService {
 	return &adminServiceImpl{
 		userRepo:             userRepo,
@@ -448,6 +459,7 @@ func NewAdminService(
 		proxyProber:          proxyProber,
 		proxyLatencyCache:    proxyLatencyCache,
 		authCacheInvalidator: authCacheInvalidator,
+		entClient:            entClient,
 	}
 }

@@ -1191,7 +1203,7 @@ func (s *adminServiceImpl) UpdateGroupSortOrders(ctx context.Context, updates []

 // AdminUpdateAPIKeyGroupID 管理员修改 API Key 分组绑定
 // groupID: nil=不修改, 指向0=解绑, 指向正整数=绑定到目标分组
-func (s *adminServiceImpl) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*APIKey, error) {
+func (s *adminServiceImpl) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*AdminUpdateAPIKeyGroupIDResult, error) {
 	apiKey, err := s.apiKeyRepo.GetByID(ctx, keyID)
 	if err != nil {
 		return nil, err
@@ -1199,15 +1211,17 @@ func (s *adminServiceImpl) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID i

 	if groupID == nil {
 		// nil 表示不修改，直接返回
-		return apiKey, nil
+		return &AdminUpdateAPIKeyGroupIDResult{APIKey: apiKey}, nil
 	}

 	if *groupID < 0 {
 		return nil, infraerrors.BadRequest("INVALID_GROUP_ID", "group_id must be non-negative")
 	}

+	result := &AdminUpdateAPIKeyGroupIDResult{}
+
 	if *groupID == 0 {
-		// 0 表示解绑分组
+		// 0 表示解绑分组（不修改 user_allowed_groups，避免影响用户其他 Key）
 		apiKey.GroupID = nil
 		apiKey.Group = nil
 	} else {
@@ -1219,11 +1233,58 @@ func (s *adminServiceImpl) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID i
 		if group.Status != StatusActive {
 			return nil, infraerrors.BadRequest("GROUP_NOT_ACTIVE", "target group is not active")
 		}
+		// 订阅类型分组：不允许通过此 API 直接绑定，需通过订阅管理流程
+		if group.IsSubscriptionType() {
+			return nil, infraerrors.BadRequest("SUBSCRIPTION_GROUP_NOT_ALLOWED", "subscription groups must be managed through the subscription workflow")
+		}
+
 		gid := *groupID
 		apiKey.GroupID = &gid
 		apiKey.Group = group
+
+		// 专属标准分组：使用事务保证「添加分组权限」与「更新 API Key」的原子性
+		if group.IsExclusive {
+			opCtx := ctx
+			var tx *dbent.Tx
+			if s.entClient == nil {
+				logger.LegacyPrintf("service.admin", "Warning: entClient is nil, skipping transaction protection for exclusive group binding")
+			} else {
+				var txErr error
+				tx, txErr = s.entClient.Tx(ctx)
+				if txErr != nil {
+					return nil, fmt.Errorf("begin transaction: %w", txErr)
+				}
+				defer func() { _ = tx.Rollback() }()
+				opCtx = dbent.NewTxContext(ctx, tx)
+			}
+
+			if addErr := s.userRepo.AddGroupToAllowedGroups(opCtx, apiKey.UserID, gid); addErr != nil {
+				return nil, fmt.Errorf("add group to user allowed groups: %w", addErr)
+			}
+			if err := s.apiKeyRepo.Update(opCtx, apiKey); err != nil {
+				return nil, fmt.Errorf("update api key: %w", err)
+			}
+			if tx != nil {
+				if err := tx.Commit(); err != nil {
+					return nil, fmt.Errorf("commit transaction: %w", err)
+				}
+			}
+
+			result.AutoGrantedGroupAccess = true
+			result.GrantedGroupID = &gid
+			result.GrantedGroupName = group.Name
+
+			// 失效认证缓存（在事务提交后执行）
+			if s.authCacheInvalidator != nil {
+				s.authCacheInvalidator.InvalidateAuthCacheByKey(ctx, apiKey.Key)
+			}
+
+			result.APIKey = apiKey
+			return result, nil
+		}
 	}

+	// 非专属分组 / 解绑：无需事务，单步更新即可
 	if err := s.apiKeyRepo.Update(ctx, apiKey); err != nil {
 		return nil, fmt.Errorf("update api key: %w", err)
 	}
@@ -1233,7 +1294,8 @@ func (s *adminServiceImpl) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID i
 		s.authCacheInvalidator.InvalidateAuthCacheByKey(ctx, apiKey.Key)
 	}

-	return apiKey, nil
+	result.APIKey = apiKey
+	return result, nil
 }

 // Account management implementations
--- a/backend/internal/service/admin_service_apikey_test.go
+++ b/backend/internal/service/admin_service_apikey_test.go
@@ -17,6 +17,44 @@ import (
 // Stubs
 // ---------------------------------------------------------------------------

+// userRepoStubForGroupUpdate implements UserRepository for AdminUpdateAPIKeyGroupID tests.
+type userRepoStubForGroupUpdate struct {
+	addGroupErr    error
+	addGroupCalled bool
+	addedUserID    int64
+	addedGroupID   int64
+}
+
+func (s *userRepoStubForGroupUpdate) AddGroupToAllowedGroups(_ context.Context, userID int64, groupID int64) error {
+	s.addGroupCalled = true
+	s.addedUserID = userID
+	s.addedGroupID = groupID
+	return s.addGroupErr
+}
+
+func (s *userRepoStubForGroupUpdate) Create(context.Context, *User) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) GetByID(context.Context, int64) (*User, error)      { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) GetByEmail(context.Context, string) (*User, error)  { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) GetFirstAdmin(context.Context) (*User, error)       { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) Update(context.Context, *User) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) Delete(context.Context, int64) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) List(context.Context, pagination.PaginationParams) ([]User, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *userRepoStubForGroupUpdate) ListWithFilters(context.Context, pagination.PaginationParams, UserListFilters) ([]User, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *userRepoStubForGroupUpdate) UpdateBalance(context.Context, int64, float64) error   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) DeductBalance(context.Context, int64, float64) error   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) UpdateConcurrency(context.Context, int64, int) error   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) ExistsByEmail(context.Context, string) (bool, error)   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) RemoveGroupFromAllowedGroups(context.Context, int64) (int64, error) {
+	panic("unexpected")
+}
+func (s *userRepoStubForGroupUpdate) UpdateTotpSecret(context.Context, int64, *string) error { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) EnableTotp(context.Context, int64) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) DisableTotp(context.Context, int64) error               { panic("unexpected") }
+
 // apiKeyRepoStubForGroupUpdate implements APIKeyRepository for AdminUpdateAPIKeyGroupID tests.
 type apiKeyRepoStubForGroupUpdate struct {
 	key       *APIKey
@@ -102,7 +140,8 @@ func (s *groupRepoStubForGroupUpdate) GetByID(_ context.Context, id int64) (*Gro
 	if s.getErr != nil {
 		return nil, s.getErr
 	}
-	return s.group, nil
+	clone := *s.group
+	return &clone, nil
 }

 // Unused methods – panic on unexpected call.
@@ -165,7 +204,7 @@ func TestAdminService_AdminUpdateAPIKeyGroupID_NilGroupID_NoOp(t *testing.T) {

 	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, nil)
 	require.NoError(t, err)
-	require.Equal(t, int64(1), got.ID)
+	require.Equal(t, int64(1), got.APIKey.ID)
 	// Update should NOT have been called (updated stays nil)
 	require.Nil(t, repo.updated)
 }
@@ -178,8 +217,8 @@ func TestAdminService_AdminUpdateAPIKeyGroupID_Unbind(t *testing.T) {

 	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(0))
 	require.NoError(t, err)
-	require.Nil(t, got.GroupID, "group_id should be nil after unbind")
-	require.Nil(t, got.Group, "group object should be nil after unbind")
+	require.Nil(t, got.APIKey.GroupID, "group_id should be nil after unbind")
+	require.Nil(t, got.APIKey.Group, "group object should be nil after unbind")
 	require.NotNil(t, repo.updated, "Update should have been called")
 	require.Nil(t, repo.updated.GroupID)
 	require.Equal(t, []string{"sk-test"}, cache.keys, "cache should be invalidated")
@@ -194,15 +233,15 @@ func TestAdminService_AdminUpdateAPIKeyGroupID_BindActiveGroup(t *testing.T) {

 	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
 	require.NoError(t, err)
-	require.NotNil(t, got.GroupID)
-	require.Equal(t, int64(10), *got.GroupID)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
 	require.Equal(t, int64(10), *apiKeyRepo.updated.GroupID)
 	require.Equal(t, []string{"sk-test"}, cache.keys)
 	// M3: verify correct group ID was passed to repo
 	require.Equal(t, int64(10), groupRepo.lastGetByIDArg)
 	// C1 fix: verify Group object is populated
-	require.NotNil(t, got.Group)
-	require.Equal(t, "Pro", got.Group.Name)
+	require.NotNil(t, got.APIKey.Group)
+	require.Equal(t, "Pro", got.APIKey.Group.Name)
 }

 func TestAdminService_AdminUpdateAPIKeyGroupID_SameGroup_Idempotent(t *testing.T) {
@@ -214,8 +253,8 @@ func TestAdminService_AdminUpdateAPIKeyGroupID_SameGroup_Idempotent(t *testing.T

 	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
 	require.NoError(t, err)
-	require.NotNil(t, got.GroupID)
-	require.Equal(t, int64(10), *got.GroupID)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
 	// Update is still called (current impl doesn't short-circuit on same group)
 	require.NotNil(t, apiKeyRepo.updated)
 	require.Equal(t, []string{"sk-test"}, cache.keys)
@@ -272,10 +311,10 @@ func TestAdminService_AdminUpdateAPIKeyGroupID_PointerIsolation(t *testing.T) {
 	inputGID := int64(10)
 	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, &inputGID)
 	require.NoError(t, err)
-	require.NotNil(t, got.GroupID)
+	require.NotNil(t, got.APIKey.GroupID)
 	// Mutating the input pointer must NOT affect the stored value
 	inputGID = 999
-	require.Equal(t, int64(10), *got.GroupID)
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
 	require.Equal(t, int64(10), *apiKeyRepo.updated.GroupID)
 }

@@ -288,6 +327,94 @@ func TestAdminService_AdminUpdateAPIKeyGroupID_NilCacheInvalidator(t *testing.T)

 	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(7))
 	require.NoError(t, err)
-	require.NotNil(t, got.GroupID)
-	require.Equal(t, int64(7), *got.GroupID)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(7), *got.APIKey.GroupID)
+}
+
+// ---------------------------------------------------------------------------
+// Tests: AllowedGroup auto-sync
+// ---------------------------------------------------------------------------
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_ExclusiveGroup_AddsAllowedGroup(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Exclusive", Status: StatusActive, IsExclusive: true, SubscriptionType: SubscriptionTypeStandard}}
+	userRepo := &userRepoStubForGroupUpdate{}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
+	// 验证 AddGroupToAllowedGroups 被调用，且参数正确
+	require.True(t, userRepo.addGroupCalled)
+	require.Equal(t, int64(42), userRepo.addedUserID)
+	require.Equal(t, int64(10), userRepo.addedGroupID)
+	// 验证 result 标记了自动授权
+	require.True(t, got.AutoGrantedGroupAccess)
+	require.NotNil(t, got.GrantedGroupID)
+	require.Equal(t, int64(10), *got.GrantedGroupID)
+	require.Equal(t, "Exclusive", got.GrantedGroupName)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_NonExclusiveGroup_NoAllowedGroupUpdate(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Public", Status: StatusActive, IsExclusive: false, SubscriptionType: SubscriptionTypeStandard}}
+	userRepo := &userRepoStubForGroupUpdate{}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	// 非专属分组不触发 AddGroupToAllowedGroups
+	require.False(t, userRepo.addGroupCalled)
+	require.False(t, got.AutoGrantedGroupAccess)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_SubscriptionGroup_Blocked(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Sub", Status: StatusActive, IsExclusive: true, SubscriptionType: SubscriptionTypeSubscription}}
+	userRepo := &userRepoStubForGroupUpdate{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo}
+
+	// 订阅类型分组应被阻止绑定
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.Error(t, err)
+	require.Equal(t, "SUBSCRIPTION_GROUP_NOT_ALLOWED", infraerrors.Reason(err))
+	require.False(t, userRepo.addGroupCalled)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_ExclusiveGroup_AllowedGroupAddFails_ReturnsError(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Exclusive", Status: StatusActive, IsExclusive: true, SubscriptionType: SubscriptionTypeStandard}}
+	userRepo := &userRepoStubForGroupUpdate{addGroupErr: errors.New("db error")}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo}
+
+	// 严格模式：AddGroupToAllowedGroups 失败时，整体操作报错
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "add group to user allowed groups")
+	require.True(t, userRepo.addGroupCalled)
+	// apiKey 不应被更新
+	require.Nil(t, apiKeyRepo.updated)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_Unbind_NoAllowedGroupUpdate(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: int64Ptr(10), Group: &Group{ID: 10, Name: "Exclusive"}}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	userRepo := &userRepoStubForGroupUpdate{}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, userRepo: userRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(0))
+	require.NoError(t, err)
+	require.Nil(t, got.APIKey.GroupID)
+	// 解绑时不修改 allowed_groups
+	require.False(t, userRepo.addGroupCalled)
+	require.False(t, got.AutoGrantedGroupAccess)
 }
--- a/backend/internal/service/admin_service_delete_test.go
+++ b/backend/internal/service/admin_service_delete_test.go
@@ -93,6 +93,10 @@ func (s *userRepoStub) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	panic("unexpected RemoveGroupFromAllowedGroups call")
 }

+func (s *userRepoStub) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	panic("unexpected AddGroupToAllowedGroups call")
+}
+
 func (s *userRepoStub) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
 	panic("unexpected UpdateTotpSecret call")
 }
--- a/backend/internal/service/user_service.go
+++ b/backend/internal/service/user_service.go
@@ -40,6 +40,8 @@ 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)
+	// AddGroupToAllowedGroups 将指定分组增量添加到用户的 allowed_groups（幂等，冲突忽略）
+	AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error

 	// TOTP 双因素认证
 	UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error
--- a/backend/internal/service/user_service_test.go
+++ b/backend/internal/service/user_service_test.go
@@ -45,7 +45,8 @@ func (m *mockUserRepo) ExistsByEmail(context.Context, string) (bool, error) { re
 func (m *mockUserRepo) RemoveGroupFromAllowedGroups(context.Context, int64) (int64, error) {
 	return 0, nil
 }
-func (m *mockUserRepo) UpdateTotpSecret(context.Context, int64, *string) error { return nil }
+func (m *mockUserRepo) AddGroupToAllowedGroups(context.Context, int64, int64) error { return nil }
+func (m *mockUserRepo) UpdateTotpSecret(context.Context, int64, *string) error      { return nil }
 func (m *mockUserRepo) EnableTotp(context.Context, int64) error                { return nil }
 func (m *mockUserRepo) DisableTotp(context.Context, int64) error               { return nil }