Initial cloud-services repo - gateway service + pkg modules

pkg/validator/update_manifest_version.go

@@ -0,0 +1,14 @@
+package validator
+
+import (
+	"regexp"
+
+	"github.com/go-playground/validator/v10"
+)
+
+const regexSUMSVersion = `^\d{4}\.(0[1-9]|1[0-2])\.\d{2}\.\d{2}(\.E{1})?$`
+
+func validateSUMSVersion(fl validator.FieldLevel) bool {
+	ok, _ := regexp.Match(regexSUMSVersion, []byte(fl.Field().String()))
+	return ok
+}