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internal/audit/service.go

@@ -0,0 +1,177 @@
+package audit
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"strings"
+	"time"
+
+	"cyberstrike-ai/internal/config"
+	"cyberstrike-ai/internal/database"
+	"cyberstrike-ai/internal/security"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"go.uber.org/zap"
+)
+
+// Service persists platform audit logs.
+type Service struct {
+	db           *database.DB
+	cfg          *config.Config
+	logger       *zap.Logger
+	failThrottle *failureThrottle
+}
+
+// NewService creates an audit service.
+func NewService(db *database.DB, cfg *config.Config, logger *zap.Logger) *Service {
+	return &Service{
+		db:           db,
+		cfg:          cfg,
+		logger:       logger,
+		failThrottle: newFailureThrottle(),
+	}
+}
+
+// Enabled reports whether audit persistence is on.
+func (s *Service) Enabled() bool {
+	if s == nil || s.cfg == nil {
+		return false
+	}
+	return s.cfg.Audit.EnabledEffective()
+}
+
+// Record writes one audit row from a Gin request context.
+func (s *Service) Record(c *gin.Context, e Entry) {
+	if s == nil || !s.Enabled() || s.db == nil {
+		return
+	}
+	if strings.TrimSpace(e.Category) == "" || strings.TrimSpace(e.Action) == "" {
+		return
+	}
+	if e.Result == "failure" && !s.allowFailureAudit(c, e) {
+		return
+	}
+	if strings.TrimSpace(e.Result) == "" {
+		e.Result = "success"
+	}
+	if strings.TrimSpace(e.Level) == "" {
+		if e.Result == "failure" {
+			e.Level = "warn"
+		} else {
+			e.Level = "info"
+		}
+	}
+	if strings.TrimSpace(e.Actor) == "" {
+		if c != nil {
+			e.Actor = strings.TrimSpace(c.GetString(security.ContextUsernameKey))
+		}
+		if e.Actor == "" {
+			e.Actor = "admin"
+		}
+	}
+	maxDetail := s.cfg.Audit.MaxDetailBytesEffective()
+	detail := SanitizeDetail(e.Detail, maxDetail)
+
+	sessionHintVal := e.SessionHint
+	if sessionHintVal == "" && c != nil {
+		if token := c.GetString(security.ContextAuthTokenKey); token != "" {
+			sessionHintVal = sessionHint(token)
+		}
+	}
+	clientIPVal := e.ClientIP
+	if clientIPVal == "" {
+		clientIPVal = clientIP(c)
+	}
+
+	row := &database.AuditLog{
+		ID:           "audit_" + strings.ReplaceAll(uuid.New().String(), "-", ""),
+		CreatedAt:    time.Now(),
+		Level:        e.Level,
+		Category:     e.Category,
+		Action:       e.Action,
+		Result:       e.Result,
+		Actor:        e.Actor,
+		SessionHint:  sessionHintVal,
+		ClientIP:     clientIPVal,
+		UserAgent:    userAgent(c),
+		ResourceType: e.ResourceType,
+		ResourceID:   e.ResourceID,
+		Message:      e.Message,
+		Detail:       detail,
+	}
+	if err := s.db.AppendAuditLog(row); err != nil && s.logger != nil {
+		s.logger.Warn("写入审计日志失败",
+			zap.String("action", e.Action),
+			zap.Error(err),
+		)
+	}
+}
+
+// RecordSystem writes an audit row without HTTP context (e.g. retention cleanup).
+func (s *Service) RecordSystem(e Entry) {
+	s.Record(nil, e)
+}
+
+// PurgeExpired deletes rows older than retention_days when configured.
+func (s *Service) PurgeExpired() {
+	if s == nil || s.db == nil || s.cfg == nil {
+		return
+	}
+	days := s.cfg.Audit.RetentionDaysEffective()
+	if days <= 0 {
+		return
+	}
+	cutoff := time.Now().AddDate(0, 0, -days)
+	n, err := s.db.DeleteAuditLogsBefore(cutoff)
+	if err != nil {
+		if s.logger != nil {
+			s.logger.Warn("清理过期审计日志失败", zap.Error(err))
+		}
+		return
+	}
+	if n > 0 && s.logger != nil {
+		s.logger.Info("已清理过期审计日志", zap.Int64("deleted", n))
+	}
+}
+
+// HintFromToken returns a short stable hash prefix for a session token.
+func HintFromToken(token string) string {
+	return sessionHint(token)
+}
+
+func sessionHint(token string) string {
+	token = strings.TrimSpace(token)
+	if token == "" {
+		return ""
+	}
+	sum := sha256.Sum256([]byte(token))
+	return hex.EncodeToString(sum[:4])
+}
+
+func (s *Service) allowFailureAudit(c *gin.Context, e Entry) bool {
+	if !isAuthFailureThrottled(e.Category, e.Action) {
+		return true
+	}
+	cooldown := time.Duration(s.cfg.Audit.AuthFailureCooldownEffective()) * time.Second
+	key := authFailureThrottleKey(e.Category, e.Action, clientIP(c))
+	return s.failThrottle.allow(key, cooldown)
+}
+
+func clientIP(c *gin.Context) string {
+	if c == nil {
+		return ""
+	}
+	return c.ClientIP()
+}
+
+func userAgent(c *gin.Context) string {
+	if c == nil {
+		return ""
+	}
+	ua := c.GetHeader("User-Agent")
+	if len(ua) > 512 {
+		return ua[:512]
+	}
+	return ua
+}