Custom parameters

To make a self-written LuaFilter look more like a regular filter, you should

• write your script in a separate lua file instead of doing it directly in the web.xml
• Define a prefix with the "NameSpace" directive in the LuaFilter

Example

filter>
   <filter-name>LuaFilter</filter-name>
   <filter-class>ch::nevis::isiweb4::filter::lua::LuaFilter</filter-class>
   <!-- Declare Naspace for Variables that will be available in the external
Script -->
   <init-param>
    <param-name>Script.Namespace</param-name>
    <param-value>My</param-value>
   </init-param>

   <init-param>
     <param-name>MyFancyParameter</param-name>
     <param-value>Something</param-value>
   </init-param>
   <init-param>
    <param-name>Script.OutputFunctionName</param-name>
    <param-value>outputStream</param-value>
   </init-param>
   <init-param>
    <param-name>Script.Path</param-name>
    <param-value>/path/to/my/script.lua</param-value>
   </init-param>
</filter>

The MyFancyParameter is now visible in the /path/to/my/script.lua

function outputStream(req, res, chunk)
 if MyFancyParameter ~= nil then
  res:setHeader("TestVariable", MyFancyParameter)
 end
 return chunk
end