dynamically discover classes in ConfigObject.create

awall/model.lua

@@ -30,6 +30,13 @@ function ConfigObject:init(context, location)
 end
 
 function ConfigObject:create(cls, params)
+   if type(cls) == 'string' then
+      local name = cls
+      cls = awall.classmap[cls]
+      if not cls then
+	 self:error('Support for '..name..' objects not installed')
+      end
+   end
    return cls.morph(params, self.context, self.location)
 end
 

awall/modules/filter.lua

@@ -69,9 +69,7 @@ function Filter:trules()
 	 dnat[attr] = self[attr]
       end
 
-      if not awall.classmap.dnat then self:error('NAT module not installed') end
-
-      awall.util.extend(res, self:create(awall.classmap.dnat, dnat):trules())
+      awall.util.extend(res, self:create('dnat', dnat):trules())
    end
 
    awall.util.extend(res, model.Rule.trules(self))