fix(agent-smith): add custom JSON marshaling for Duration in filesystem config

- Add Duration wrapper type with custom JSON marshaling/unmarshaling
- Fixes error: 'cannot unmarshal string into Go struct field scanInterval of type time.Duration'
- Allows scanInterval to be specified as string like '5m' in JSON config
- Update agent.go to extract Duration.Duration when creating detector config
- Resolves runtime config parsing error in Kubernetes deployment

Co-authored-by: Ona <[email protected]>

Author: kylos101

components/ee/agent-smith/pkg/agent/agent.go

@@ -144,7 +144,7 @@ func NewAgentSmith(cfg config.Config) (*Smith, error) {
 		// Create filesystem detector config
 		fsConfig := detector.FilesystemScanningConfig{
 			Enabled:      cfg.FilesystemScanning.Enabled,
-			ScanInterval: cfg.FilesystemScanning.ScanInterval,
+			ScanInterval: cfg.FilesystemScanning.ScanInterval.Duration,
 			MaxFileSize:  cfg.FilesystemScanning.MaxFileSize,
 			WorkingArea:  cfg.FilesystemScanning.WorkingArea,
 		}

components/ee/agent-smith/pkg/config/config.go

@@ -193,10 +193,36 @@ type WorkspaceManagerConfig struct {
 
 // FilesystemScanning configures filesystem signature scanning
 type FilesystemScanning struct {
-	Enabled      bool          `json:"enabled"`
-	ScanInterval time.Duration `json:"scanInterval"`
-	MaxFileSize  int64         `json:"maxFileSize"`
-	WorkingArea  string        `json:"workingArea"`
+	Enabled      bool     `json:"enabled"`
+	ScanInterval Duration `json:"scanInterval"`
+	MaxFileSize  int64    `json:"maxFileSize"`
+	WorkingArea  string   `json:"workingArea"`
+}
+
+// Duration wraps time.Duration to provide JSON marshaling/unmarshaling
+type Duration struct {
+	time.Duration
+}
+
+// UnmarshalJSON implements json.Unmarshaler interface
+func (d *Duration) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return err
+	}
+
+	duration, err := time.ParseDuration(s)
+	if err != nil {
+		return err
+	}
+
+	d.Duration = duration
+	return nil
+}
+
+// MarshalJSON implements json.Marshaler interface
+func (d Duration) MarshalJSON() ([]byte, error) {
+	return json.Marshal(d.Duration.String())
 }
 
 // Slackwebhooks holds slack notification configuration for different levels of penalty severity