Persist Cookie and Domain Modification iRule question

The example looks like a similar problem I've got at the moment.

 

 

The example seems to work with a sub-domain within a same domain:

 

e.g. https://accesscontrol.abc.com.au/

 

 

But how would you get the F5 to use an iRule or iRules to:

 

1. Detect a referer URL in one domain (like in this example; http://foo.com.au/AppStart/something);

 

2. use the iRule to redirect to another domain (like in the example; http://abc.com.au/AppStart/something) which is passed back to another F5 VIP;

 

3. Another iRule would detect the redirected referer URL (like in the example; http://abc.com.au/AppStart/something);

 

4. Create a cookie called SetRequestAuthnContext (as in the example) with a specific cookie value (like in the example; Something) in the redirected referer domain (like in the example; http://abc.com.au)

 

5. After setting the cookie in the abc.com.au domain; redirect back to the original referer URL (http://foo.com.au/TheApplication)

 

6. The original referer URL will read the SetRequestAuthnContext cookie and forwarded their browser to a specific element within a original referer URL.

 

 

It looks like Santhana's rule suggests the above steps yet I'm a little lost when it comes to coding the F5 iRule itself.

 

Fabian