how to get an SP to lookup the list of institutions from the ukfederation metadata

[Peter Schober]

* Sunny <ssn at ebi.ac.uk> [2015-09-10 14:54]:
> The IdP is fully integrated with ukfederation i.e. our IdP appears in
> metadata that is downloaded every night. I have an SP and want to use the
> ukfederation metadata so users worldwide can select their home institution
> from the drop down list which will redirect them to their home IdP to
> authenticate - I can manually get it to show the home institution via adding
> info to relying-party.xml but am not sure how to get the SP to lookup the
> ukfederation list.

The SP doesn't have/use a file called relying-party.xml, so how can
changing that file "get it to show the home institution" on the SP?

Do you already have a way for your SP to allow subjects to pick from a
list of IDPs? If yes, what is the question? Using the appropriate
metadata feed from your federation you should get all the IDPs you'll
need (well, those that run an IDP the federation(s) know(s) about,
that is).
If no, you should install an IDP Discovery Service, e.g. the
Shibboleth EDS which was written to work well with the Shibboleth SP.
Once your SP has metadata configured, the EDS should show a whole
bunch of IDPs.
-peter