Add rest api. (#7389)

scripts/lua/rest/v2/get/tables/user_columns_config.lua

@@ -0,0 +1,38 @@
+--
+-- (C) 2013-23 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+-- #####################################
+
+local rest_utils = require("rest_utils")
+
+-- #####################################
+
+local redis_base_key = "ntopng.columns_config.%s.%s"
+
+-- #####################################
+
+
+-- @brief Retrieves columns configurations
+local function get_column_config() 
+
+  local table_id = _GET["table_id"]
+  local user_id = _SESSION["user"]
+
+  if(isEmptyString(table_id)) then
+    rest_utils.answer(rest_utils.consts.err.invalid_args)
+  end
+
+  local redis_key = string.format(redis_base_key, table_id, user_id)
+
+  local visible_columns = ntop.getCache(redis_key) or {}
+
+  return(rest_utils.answer(rest_utils.consts.success.ok, visible_columns))
+end
+
+return(get_column_config())
+
+