feat: config presets

local/service/config.go

@@ -561,6 +561,12 @@ func (as *ConfigService) SaveConfiguration(server *model.Server, config *model.C
 	return err
 }
 
+// ApplySection writes a single config section to the server's config file and
+// records the change. It is used by ConfigPresetService to apply preset sections.
+func (as *ConfigService) ApplySection(ctx context.Context, serverID, configFile string, body *map[string]interface{}, actorID, actorUsername string) (*model.Config, error) {
+	return as.updateConfigInternal(ctx, serverID, configFile, body, false, actorID, actorUsername)
+}
+
 func (as *ConfigService) SetServerName(server *model.Server, name string) error {
 	configMap := map[string]interface{}{
 		"serverName": name,

local/service/config_preset.go

@@ -0,0 +1,176 @@
+package service
+
+import (
+	"acc-server-manager/local/model"
+	"acc-server-manager/local/repository"
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/google/uuid"
+)
+
+const (
+	presetMaxNameLen        = 100
+	presetMaxDescLen        = 500
+	presetMaxSectionBytes   = 64 * 1024 // 64 KB per config section
+)
+
+type ConfigPresetService struct {
+	repository    *repository.ConfigPresetRepository
+	configService *ConfigService
+}
+
+func NewConfigPresetService(repo *repository.ConfigPresetRepository, configService *ConfigService) *ConfigPresetService {
+	return &ConfigPresetService{
+		repository:    repo,
+		configService: configService,
+	}
+}
+
+func (s *ConfigPresetService) ListPresets(ctx context.Context, filter *model.ConfigPresetFilter) (*[]model.ConfigPreset, error) {
+	return s.repository.GetAll(ctx, filter)
+}
+
+func (s *ConfigPresetService) GetPreset(ctx context.Context, id uuid.UUID) (*model.ConfigPreset, error) {
+	preset, err := s.repository.GetByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	if preset == nil {
+		return nil, fmt.Errorf("preset not found")
+	}
+	return preset, nil
+}
+
+func (s *ConfigPresetService) CreatePreset(ctx context.Context, req *model.ConfigPresetCreateRequest) (*model.ConfigPreset, error) {
+	if req.Name == "" {
+		return nil, fmt.Errorf("preset name is required")
+	}
+	if len(req.Name) > presetMaxNameLen {
+		return nil, fmt.Errorf("preset name exceeds maximum length of %d characters", presetMaxNameLen)
+	}
+	if len(req.Description) > presetMaxDescLen {
+		return nil, fmt.Errorf("preset description exceeds maximum length of %d characters", presetMaxDescLen)
+	}
+
+	preset := &model.ConfigPreset{
+		Name:        req.Name,
+		Description: req.Description,
+	}
+
+	if err := marshalSections(req.Configuration, req.AssistRules, req.Event, req.EventRules, req.Settings, preset); err != nil {
+		return nil, err
+	}
+
+	if err := s.repository.Insert(ctx, preset); err != nil {
+		return nil, err
+	}
+	return preset, nil
+}
+
+func (s *ConfigPresetService) UpdatePreset(ctx context.Context, id uuid.UUID, req *model.ConfigPresetUpdateRequest) (*model.ConfigPreset, error) {
+	preset, err := s.GetPreset(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+
+	if req.Name != nil {
+		if len(*req.Name) == 0 {
+			return nil, fmt.Errorf("preset name cannot be empty")
+		}
+		if len(*req.Name) > presetMaxNameLen {
+			return nil, fmt.Errorf("preset name exceeds maximum length of %d characters", presetMaxNameLen)
+		}
+		preset.Name = *req.Name
+	}
+	if req.Description != nil {
+		if len(*req.Description) > presetMaxDescLen {
+			return nil, fmt.Errorf("preset description exceeds maximum length of %d characters", presetMaxDescLen)
+		}
+		preset.Description = *req.Description
+	}
+	if err := marshalSections(req.Configuration, req.AssistRules, req.Event, req.EventRules, req.Settings, preset); err != nil {
+		return nil, err
+	}
+
+	if err := s.repository.Update(ctx, preset); err != nil {
+		return nil, err
+	}
+	return preset, nil
+}
+
+func (s *ConfigPresetService) DeletePreset(ctx context.Context, id uuid.UUID) error {
+	return s.repository.Delete(ctx, id)
+}
+
+func (s *ConfigPresetService) ApplyPreset(ctx context.Context, serverID string, presetID uuid.UUID, actorID, actorUsername string) ([]*model.Config, error) {
+	preset, err := s.GetPreset(ctx, presetID)
+	if err != nil {
+		return nil, err
+	}
+
+	type sectionEntry struct {
+		fileName string
+		raw      string
+	}
+
+	sections := []sectionEntry{
+		{ConfigurationJson, preset.Configuration},
+		{AssistRulesJson, preset.AssistRules},
+		{EventJson, preset.Event},
+		{EventRulesJson, preset.EventRules},
+		{SettingsJson, preset.Settings},
+	}
+
+	var results []*model.Config
+	for _, section := range sections {
+		if section.raw == "" {
+			continue
+		}
+		var body map[string]interface{}
+		if err := json.Unmarshal([]byte(section.raw), &body); err != nil {
+			return nil, fmt.Errorf("failed to unmarshal preset section %s: %v", section.fileName, err)
+		}
+		result, err := s.configService.ApplySection(ctx, serverID, section.fileName, &body, actorID, actorUsername)
+		if err != nil {
+			return nil, fmt.Errorf("failed to apply preset section %s: %v", section.fileName, err)
+		}
+		if result != nil {
+			results = append(results, result)
+		}
+	}
+
+	return results, nil
+}
+
+// marshalSections marshals each non-nil config section into the preset's JSON string fields,
+// enforcing the per-section byte size limit.
+func marshalSections(configuration, assistRules, event, eventRules, settings *map[string]interface{}, preset *model.ConfigPreset) error {
+	type entry struct {
+		src  *map[string]interface{}
+		name string
+		dest *string
+	}
+	entries := []entry{
+		{configuration, "configuration", &preset.Configuration},
+		{assistRules, "assistRules", &preset.AssistRules},
+		{event, "event", &preset.Event},
+		{eventRules, "eventRules", &preset.EventRules},
+		{settings, "settings", &preset.Settings},
+	}
+	for _, e := range entries {
+		if e.src == nil {
+			continue
+		}
+		b, err := json.Marshal(e.src)
+		if err != nil {
+			return fmt.Errorf("failed to marshal %s: %v", e.name, err)
+		}
+		if len(b) > presetMaxSectionBytes {
+			return fmt.Errorf("%s section exceeds maximum size of %d bytes", e.name, presetMaxSectionBytes)
+		}
+		*e.dest = string(b)
+	}
+	return nil
+}

local/service/service.go

@@ -32,6 +32,7 @@ func InitializeServices(c *dig.Container) {
 	c.Provide(NewMembershipService)
 	c.Provide(NewWebSocketService)
 	c.Provide(NewLeaderboardService)
+	c.Provide(NewConfigPresetService)
 
 	// Always provide the PortPoolManager; in Windows mode it seeds from an
 	// empty result set and sits idle.