added RoleInRoles utility function

keycloakclaims/utils.go

@@ -0,0 +1,10 @@
+package keycloakclaims
+
+func RoleInRoles(role string, claims *Claims) bool {
+	for _, v := range claims.RealmAccess.Roles {
+		if role == v {
+			return true
+		}
+	}
+	return false
+}