IPTV Muxes : Use a script instead of URL

Hello,

Have you an idea how I can use a bash script instead URL for redirect the client to the right URL with valid cookieid when try to reach the stream ?
I try a lot of things but no one work from TVheadend. My latest solution is Apache who process the script and redirect to the right and valid URL.

Someone already do that ?
What is the right way when the stream required authentication with a cookie ?