create CMS error handling

internal/cms/handler_errors.go

@@ -0,0 +1,33 @@
+package cms
+
+import (
+	"errors"
+	"strings"
+
+	"tm/pkg/response"
+
+	"github.com/labstack/echo/v4"
+)
+
+func handleParseError(c echo.Context, err error) error {
+	if err == nil {
+		return nil
+	}
+	if strings.Contains(err.Error(), "invalid request format") {
+		return response.BadRequest(c, "Invalid request format", err.Error())
+	}
+	return response.ValidationError(c, "Please fix the validation errors", FormatValidationErrors(err))
+}
+
+func handleServiceError(c echo.Context, err error, fallback string) error {
+	if err == nil {
+		return nil
+	}
+	if errors.Is(err, ErrCMSKeyExists) {
+		return response.Conflict(c, "A marketing page with this key already exists")
+	}
+	if errors.Is(err, ErrCMSNotFound) {
+		return response.NotFound(c, "Marketing page not found")
+	}
+	return response.InternalServerError(c, fallback)
+}