Add support for system configuration (WIP)

scripts/lua/modules/system_config/appliance_config.lua

@@ -0,0 +1,60 @@
+--
+-- (C) 2020 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/system_config/?.lua;" .. package.path
+package.path = dirs.installdir .. "/pro/scripts/lua/modules/?.lua;" .. package.path
+require "lua_utils" 
+local system_config = require "system_config"
+local json = require "dkjson"
+local rest_utils = require "rest_utils"
+
+-- ##############################################
+
+-- Example 
+-- package.path = dirs.installdir .. "/scripts/lua/modules/system_config/?.lua;" .. package.path
+-- -- Editable
+-- local appliance_config = require "appliance_config":create(true)
+-- -- Readable
+-- local appliance_config = require "appliance_config":create()
+
+-- ##############################################
+
+local appliance_config = {}
+
+-- ##############################################
+
+function appliance_config:create(editable)
+   -- Instance of the base class
+   local _system_config = system_config:create()
+
+   -- Subclass using the base class instance
+   self.key = "appliance"
+   -- self is passed as argument so it will be set as base class metatable
+   -- and this will actually make it possible to override functions
+   local _appliance_config = _system_config:create(self)
+
+   if editable then
+      _appliance_config:editable()
+   else
+      _appliance_config:readable()
+   end
+
+   -- Return the instance
+   return _appliance_config
+end
+
+-- ##############################################
+
+function appliance_config:guess_config()
+   local config = {}
+
+   -- TODO
+
+   return config
+end
+
+-- ##############################################
+
+return appliance_config