add feature license management

backend/internal/scst/service.go

@@ -1830,6 +1830,59 @@ func (s *Service) WriteConfig(ctx context.Context, configPath string) error {
 	return nil
 }
 
+// ReadConfigFile reads the SCST configuration file content
+func (s *Service) ReadConfigFile(ctx context.Context, configPath string) (string, error) {
+	// First, write current config to temp file to get the actual config
+	tempPath := "/tmp/scst_config_read.conf"
+	cmd := exec.CommandContext(ctx, "sudo", "scstadmin", "-write_config", tempPath)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return "", fmt.Errorf("failed to write SCST config: %s: %w", string(output), err)
+	}
+
+	// Read the config file
+	configData, err := os.ReadFile(tempPath)
+	if err != nil {
+		return "", fmt.Errorf("failed to read config file: %w", err)
+	}
+
+	return string(configData), nil
+}
+
+// WriteConfigFile writes content to SCST configuration file
+func (s *Service) WriteConfigFile(ctx context.Context, configPath string, content string) error {
+	// Write content to temp file first
+	tempPath := "/tmp/scst_config_write.conf"
+	if err := os.WriteFile(tempPath, []byte(content), 0644); err != nil {
+		return fmt.Errorf("failed to write temp config file: %w", err)
+	}
+
+	// Use scstadmin to load the config (this validates and applies it)
+	cmd := exec.CommandContext(ctx, "sudo", "scstadmin", "-config", tempPath)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("failed to load SCST config: %s: %w", string(output), err)
+	}
+
+	// Write to the actual config path using sudo
+	if configPath != tempPath {
+		// Use sudo cp to copy temp file to actual config path
+		cpCmd := exec.CommandContext(ctx, "sudo", "cp", tempPath, configPath)
+		cpOutput, cpErr := cpCmd.CombinedOutput()
+		if cpErr != nil {
+			return fmt.Errorf("failed to copy config file: %s: %w", string(cpOutput), cpErr)
+		}
+		// Set proper permissions
+		chmodCmd := exec.CommandContext(ctx, "sudo", "chmod", "644", configPath)
+		if chmodErr := chmodCmd.Run(); chmodErr != nil {
+			s.logger.Warn("Failed to set config file permissions", "error", chmodErr)
+		}
+	}
+
+	s.logger.Info("SCST configuration file written", "path", configPath)
+	return nil
+}
+
 // HandlerInfo represents SCST handler information
 type HandlerInfo struct {
 	Name        string `json:"name"`