From 1d56b11fbd7a65708cdc39f2f38ceb8959ba2b5a Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Wed, 13 May 2020 16:35:23 +0100
Subject: [PATCH] [Project] Add `lower` method to lua_text

---
 src/lua/lua_text.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/src/lua/lua_text.c b/src/lua/lua_text.c
index d1cf14c6f..fcaa9b90a 100644
--- a/src/lua/lua_text.c
+++ b/src/lua/lua_text.c
@@ -125,6 +125,14 @@ LUA_FUNCTION_DEF (text, at);
  * @return {table|integer} bytes in the array (as unsigned char)
  */
 LUA_FUNCTION_DEF (text, bytes);
+/***
+ * @method rspamd_text:lower([is_utf, [inplace]])
+ * Return a new text with lowercased characters, if is_utf is true then Rspamd applies utf8 lowercase
+ * @param {boolean} is_utf apply utf8 lowercase
+ * @param {boolean} inplace lowercase the original text
+ * @return rspamd_text} new rspamd_text (or the original text if inplace) with lowercased letters
+ */
+LUA_FUNCTION_DEF (text, lower);
 LUA_FUNCTION_DEF (text, take_ownership);
 /***
  * @method rspamd_text:exclude_chars(set_to_exclude, [always_copy])
@@ -207,6 +215,7 @@ static const struct luaL_reg textlib_m[] = {
 		LUA_INTERFACE_DEF (text, split),
 		LUA_INTERFACE_DEF (text, at),
 		LUA_INTERFACE_DEF (text, bytes),
+		LUA_INTERFACE_DEF (text, lower),
 		LUA_INTERFACE_DEF (text, exclude_chars),
 		LUA_INTERFACE_DEF (text, oneline),
 		LUA_INTERFACE_DEF (text, base32),
@@ -1422,6 +1431,43 @@ lua_text_oneline (lua_State *L)
 	return 1;
 }
 
+static gint
+lua_text_lower (lua_State *L)
+{
+	LUA_TRACE_POINT;
+	struct rspamd_lua_text *t = lua_check_text (L, 1), *nt;
+	gboolean is_utf8 = FALSE, is_inplace = FALSE;
+
+	if (t != NULL) {
+		if (lua_isboolean (L, 2)) {
+			is_utf8 = lua_toboolean (L, 2);
+		}
+		if (lua_isboolean (L, 3)) {
+			is_inplace = lua_toboolean (L, 3);
+		}
+
+		if (is_inplace) {
+			nt = t;
+			lua_pushvalue (L, 1);
+		}
+		else {
+			nt = lua_new_text (L, t->start, t->len, TRUE);
+		}
+
+		if (!is_utf8) {
+			rspamd_str_lc ((gchar *) nt->start, nt->len);
+		}
+		else {
+			rspamd_str_lc_utf8 ((gchar *) nt->start, nt->len);
+		}
+	}
+	else {
+		return luaL_error (L, "invalid arguments");
+	}
+
+	return 1;
+}
+
 /* Used to distinguish lua text metatable */
 static const guint rspamd_lua_text_cookie = 0x2b21ef6fU;
 
-- 
2.39.5