feat(*): 功能开放与页面布局 - 新增运维开关并优化后台及创作界面空间利用

backend/internal/service/feature_availability.go

@@ -0,0 +1,139 @@
+package service
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+	"time"
+
+	"infinite-canvas/backend/internal/model"
+
+	"gorm.io/gorm"
+)
+
+const featureAvailabilitySettingKey = "feature_availability"
+
+const (
+	FeatureShortDrama = "shortDrama"
+	FeatureTaskCenter = "taskCenter"
+	FeatureCredits    = "credits"
+)
+
+type FeatureAvailability struct {
+	ShortDramaEnabled bool `json:"shortDramaEnabled"`
+	TaskCenterEnabled bool `json:"taskCenterEnabled"`
+	CreditsEnabled    bool `json:"creditsEnabled"`
+}
+
+type PublicFeatureAvailability struct {
+	FeatureAvailability
+	Configured bool      `json:"configured"`
+	UpdatedBy  string    `json:"updatedBy,omitempty"`
+	UpdatedAt  time.Time `json:"updatedAt,omitempty"`
+}
+
+func defaultFeatureAvailability() FeatureAvailability {
+	// 缺少配置代表尚未由运维接管，默认保持现有功能全部开放。
+	return FeatureAvailability{ShortDramaEnabled: true, TaskCenterEnabled: true, CreditsEnabled: true}
+}
+
+func (s *Service) FeatureAvailability() (*PublicFeatureAvailability, error) {
+	setting, value, err := s.readFeatureAvailability()
+	if err != nil {
+		return nil, err
+	}
+	return publicFeatureAvailability(setting, value), nil
+}
+
+func (s *Service) AdminFeatureAvailability(actor *model.User) (*PublicFeatureAvailability, error) {
+	if err := s.RequireAdmin(actor); err != nil {
+		return nil, err
+	}
+	return s.FeatureAvailability()
+}
+
+func (s *Service) UpdateFeatureAvailability(actor *model.User, value FeatureAvailability) (*PublicFeatureAvailability, error) {
+	if err := s.RequireAdmin(actor); err != nil {
+		return nil, err
+	}
+	current, before, err := s.readFeatureAvailability()
+	if err != nil {
+		return nil, err
+	}
+	encoded, err := json.Marshal(value)
+	if err != nil {
+		return nil, err
+	}
+	setting := model.SystemSetting{Key: featureAvailabilitySettingKey, ValueJSON: string(encoded), UpdatedBy: actor.ID}
+	if current != nil {
+		setting.CreatedAt = current.CreatedAt
+	}
+	if err := s.repo.SaveSystemSetting(&setting); err != nil {
+		return nil, err
+	}
+	if err := s.appendAdminAudit(actor, "feature_availability.update", "system_setting", featureAvailabilitySettingKey, "更新功能开放配置", map[string]any{"before": before, "after": value}); err != nil {
+		return nil, err
+	}
+	return publicFeatureAvailability(&setting, value), nil
+}
+
+func (s *Service) FeatureEnabled(feature string) (bool, error) {
+	_, value, err := s.readFeatureAvailability()
+	if err != nil {
+		return false, err
+	}
+	switch feature {
+	case FeatureShortDrama:
+		return value.ShortDramaEnabled, nil
+	case FeatureTaskCenter:
+		return value.TaskCenterEnabled, nil
+	case FeatureCredits:
+		return value.CreditsEnabled, nil
+	default:
+		return false, errors.New("未知功能开放配置")
+	}
+}
+
+func (s *Service) RequireFeature(feature string) error {
+	enabled, err := s.FeatureEnabled(feature)
+	if err != nil {
+		return err
+	}
+	if enabled {
+		return nil
+	}
+	switch feature {
+	case FeatureShortDrama:
+		return Forbidden("短剧创作暂未开放")
+	case FeatureTaskCenter:
+		return Forbidden("任务中心暂未开放")
+	case FeatureCredits:
+		return Forbidden("积分功能暂未开放")
+	default:
+		return Forbidden("该功能暂未开放")
+	}
+}
+
+func (s *Service) readFeatureAvailability() (*model.SystemSetting, FeatureAvailability, error) {
+	setting, err := s.repo.SystemSetting(featureAvailabilitySettingKey)
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, defaultFeatureAvailability(), nil
+	}
+	if err != nil {
+		return nil, FeatureAvailability{}, err
+	}
+	value := FeatureAvailability{}
+	if strings.TrimSpace(setting.ValueJSON) == "" || json.Unmarshal([]byte(setting.ValueJSON), &value) != nil {
+		return nil, FeatureAvailability{}, errors.New("功能开放配置格式无效")
+	}
+	return setting, value, nil
+}
+
+func publicFeatureAvailability(setting *model.SystemSetting, value FeatureAvailability) *PublicFeatureAvailability {
+	result := &PublicFeatureAvailability{FeatureAvailability: value, Configured: setting != nil}
+	if setting != nil {
+		result.UpdatedBy = setting.UpdatedBy
+		result.UpdatedAt = setting.UpdatedAt
+	}
+	return result
+}