From 177a08af91c2094dd76366907f4b424c30daba03 Mon Sep 17 00:00:00 2001
From: midoks <midoks@163.com>
Date: Sun, 12 Feb 2023 02:12:34 +0800
Subject: [PATCH] Update waf_common.lua

---
 plugins/op_waf/waf/lua/waf_common.lua | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/plugins/op_waf/waf/lua/waf_common.lua b/plugins/op_waf/waf/lua/waf_common.lua
index 10f254987..21007a5fc 100644
--- a/plugins/op_waf/waf/lua/waf_common.lua
+++ b/plugins/op_waf/waf/lua/waf_common.lua
@@ -390,6 +390,12 @@ function _M.read_file(self, name)
     return data
 end
 
+function _M.file_exists(self,path)
+  local file = io.open(path, "rb")
+  if file then file:close() end
+  return file ~= nil
+end
+
 
 function _M.select_rule(self, rules)
     if not rules then return {} end