Add error package

err/err.go

@@ -0,0 +1,47 @@
+package err
+
+import (
+	"github.com/labstack/echo/v4"
+	"net/http"
+)
+
+type NotFoundError struct {
+	Message string
+}
+
+func (err NotFoundError) Error() string {
+	return err.Message
+}
+
+type UnknownError struct {
+	Message string
+}
+
+func (err UnknownError) Error() string {
+	return err.Message
+}
+
+type AlreadyExistsError struct {
+	Message string
+}
+
+func (err AlreadyExistsError) Error() string {
+	return err.Message
+}
+
+func MapErrToHTTPErr(err interface{}) *echo.HTTPError {
+	switch v := err.(type) {
+	case NotFoundError:
+		return echo.NewHTTPError(http.StatusNotFound, v.Message)
+	case UnknownError:
+		if v.Message != "" {
+			return echo.NewHTTPError(http.StatusInternalServerError, v.Message)
+		} else {
+			return echo.NewHTTPError(http.StatusInternalServerError)
+		}
+	case AlreadyExistsError:
+		return echo.NewHTTPError(http.StatusBadRequest, v.Message)
+	default:
+		return nil
+	}
+}