RelyParty redirect URL

[Joseph Fischetti]

Hi All,
We’re discussing the implementation of a flow that will send a user to a specific page (at a predefined SP) prior to allowing them to continue on to the SP that they were trying to get to.  The flow part is easy and done, but what I’m looking for is a url that I can send to the predefined SP so it knows where the user was trying to get.  The flow would look like:

User tries to get to SP-A
Bounce to Shibboleth
Log in to Shibboleth
Flow intercept sends user to SP-B+redirect=SP-A
SP-B does it’s thing
SP-B sends the user to SP-A

I had considered using the entityID, but that wont work for obvious reasons.

Can someone point me in the direction of the documentation that might include what I need to expose various RelyingParty endpoints/urls in a velocity template?  I’m hoping there’s something consistent between SAML and CAS services that would be [the url that the IdP would be sending the user to after logging in].

Joe