[Minor] Lua_util: Add QP encoding utility

diff --git a/src/lua/lua_util.c b/src/lua/lua_util.c
index 377e08f707ea12f04a6ef6a91145270a53e6a1fb..5c6d38a87c2880f50cc5770c422ab969eabdf385 100644 (file)
--- a/src/lua/lua_util.c
+++ b/src/lua/lua_util.c
@@ -58,6 +58,14 @@ LUA_FUNCTION_DEF (util, config_from_ucl);
  * @return {rspamd_text} encoded data chunk
  */
 LUA_FUNCTION_DEF (util, encode_base64);
+/***
+ * @function util.encode_qp(input[, str_len, [newlines_type]])
+ * Encodes data in quouted printable breaking lines if needed
+ * @param {text or string} input input data
+ * @param {number} str_len optional size of lines or 0 if split is not needed
+ * @return {rspamd_text} encoded data chunk
+ */
+LUA_FUNCTION_DEF (util, encode_qp);
 /***
  * @function util.decode_base64(input)
  * Decodes data from base64 ignoring whitespace characters
@@ -546,6 +554,7 @@ static const struct luaL_reg utillib_f[] = {
        LUA_INTERFACE_DEF (util, config_from_ucl),
        LUA_INTERFACE_DEF (util, process_message),
        LUA_INTERFACE_DEF (util, encode_base64),
+       LUA_INTERFACE_DEF (util, encode_qp),
        LUA_INTERFACE_DEF (util, decode_base64),
        LUA_INTERFACE_DEF (util, encode_base32),
        LUA_INTERFACE_DEF (util, decode_base32),
@@ -902,6 +911,70 @@ lua_util_encode_base64 (lua_State *L)
        return 1;
 }
 
+static gint
+lua_util_encode_qp (lua_State *L)
+{
+       LUA_TRACE_POINT;
+       struct rspamd_lua_text *t;
+       const gchar *s = NULL;
+       gchar *out;
+       gsize inlen, outlen;
+       guint str_lim = 0;
+
+       if (lua_type (L, 1) == LUA_TSTRING) {
+               s = luaL_checklstring (L, 1, &inlen);
+       }
+       else if (lua_type (L, 1) == LUA_TUSERDATA) {
+               t = lua_check_text (L, 1);
+
+               if (t != NULL) {
+                       s = t->start;
+                       inlen = t->len;
+               }
+       }
+
+       if (lua_gettop (L) > 1) {
+               str_lim = luaL_checknumber (L, 2);
+       }
+
+       if (s == NULL) {
+               lua_pushnil (L);
+       }
+       else {
+               enum rspamd_newlines_type how = RSPAMD_TASK_NEWLINES_CRLF;
+
+               if (lua_type (L, 3) == LUA_TSTRING) {
+                       const gchar *how_str = lua_tostring (L, 3);
+
+                       if (g_ascii_strcasecmp (how_str, "cr") == 0) {
+                               how = RSPAMD_TASK_NEWLINES_CR;
+                       }
+                       else if (g_ascii_strcasecmp (how_str, "lf") == 0) {
+                               how = RSPAMD_TASK_NEWLINES_LF;
+                       }
+                       else if (g_ascii_strcasecmp (how_str, "crlf") != 0) {
+                               return luaL_error (L, "invalid newline style: %s", how_str);
+                       }
+               }
+
+               out = rspamd_encode_qp_fold (s, inlen, str_lim, &outlen, how);
+
+               if (out != NULL) {
+                       t = lua_newuserdata (L, sizeof (*t));
+                       rspamd_lua_setclass (L, "rspamd{text}", -1);
+                       t->start = out;
+                       t->len = outlen;
+                       /* Need destruction */
+                       t->flags = RSPAMD_TEXT_FLAG_OWN;
+               }
+               else {
+                       lua_pushnil (L);
+               }
+       }
+
+       return 1;
+}
+
 static gint
 lua_util_decode_base64 (lua_State *L)
 {