refactor: разнести пакеты и обновить валидацию

protocol/validation.go

@@ -0,0 +1,35 @@
+package protocol
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/go-playground/validator/v10"
+)
+
+var validate = validator.New(validator.WithRequiredStructEnabled())
+
+func Validate(cfg Config, state ContentState) error {
+	cfg = NormalizeConfig(cfg)
+
+	route := strings.TrimSpace(state.Route)
+	template := strings.TrimSpace(state.Template)
+
+	if err := validate.Var(route, "required"); err != nil {
+		return fmt.Errorf("%w: route is required", ErrInvalidData)
+	}
+	if err := validate.Var([]rune(route), fmt.Sprintf("max=%d", cfg.MaxRouteLen)); err != nil {
+		return fmt.Errorf("%w: route must be at most %d characters", ErrInvalidData, cfg.MaxRouteLen)
+	}
+	if err := validate.Var([]rune(state.Text), fmt.Sprintf("max=%d", cfg.MaxTextLen)); err != nil {
+		return fmt.Errorf("%w: str must be at most %d characters", ErrInvalidData, cfg.MaxTextLen)
+	}
+	if err := validate.Var(template, "required"); err != nil {
+		return fmt.Errorf("%w: tpl_name is required", ErrInvalidData)
+	}
+	if err := validate.Var([]rune(template), fmt.Sprintf("max=%d", cfg.MaxTemplateLen)); err != nil {
+		return fmt.Errorf("%w: tpl_name must be at most %d characters", ErrInvalidData, cfg.MaxTemplateLen)
+	}
+
+	return nil
+}