From 901280dbedc27054b1fe4cf6d04de7e47c990793 Mon Sep 17 00:00:00 2001
From: Wangchong Zhou <wangchong@konghq.com>
Date: Mon, 2 Dec 2024 22:57:16 +0800
Subject: [PATCH] fix(ai-prompr-decorator): fix unable to modify request

---
 .../plugins/ai-prompt-decorator/filters/decorate-prompt.lua | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kong/plugins/ai-prompt-decorator/filters/decorate-prompt.lua b/kong/plugins/ai-prompt-decorator/filters/decorate-prompt.lua
index df0ad052b91..525c0822363 100644
--- a/kong/plugins/ai-prompt-decorator/filters/decorate-prompt.lua
+++ b/kong/plugins/ai-prompt-decorator/filters/decorate-prompt.lua
@@ -6,6 +6,7 @@
 -- [ END OF LICENSE 0867164ffc95e54f04670b5169c09574bdbd9bba ]
 
 local new_tab = require("table.new")
+local deep_copy = require("kong.tools.table").deep_copy
 local ai_plugin_ctx = require("kong.llm.plugin.ctx")
 
 local _M = {
@@ -36,6 +37,9 @@ local function execute(request, conf)
   local prepend = conf.prompts.prepend or EMPTY
   local append = conf.prompts.append or EMPTY
 
+  -- ensure we don't modify the original request
+  request = deep_copy(request)
+
   local old_messages = request.messages
   local new_messages = new_tab(#append + #prepend + #old_messages, 0)
   request.messages = new_messages
@@ -84,4 +88,4 @@ function _M:run(conf)
   return true
 end
 
-return _M
\ No newline at end of file
+return _M