I'm not sure of the answer to the following questions:

1.      Can the pac4j support handle multiple IdPs?  (I assume the metadata 
file in the configuration properties can handle multiple EntityDescriptor 
tags.)

Yes.

2.      Assuming (1) is true, is the Login Provider UI smart enough to 
populate multiple provider buttons for the different IdPs?  (This would be 
really cool, as it would allow me to jettison more custom code.)

No.

3.      This may be my ignorance of the new Spring way of wiring things (if 
so, tell me to RTFM), but is it possible to hook in a custom 
PrincipalResolver to the pac4j AuthenticationHandlers?  I have a specialized 
interface to a proprietary directory to map attributes in the SAML assertion 
to an entry in our directory.

Yes, define bean with this id:
https://github.com/apereo/cas/blob/master/support/cas-server-support-pac4j/src/main/java/org/apereo/cas/support/pac4j/config/Pac4jConfiguration.java#L59

If the answer to any of these is 'no', would it be possible to accomodate 
them with a patch to only CAS code (or custom extensions), or will (at least 
for (1) and (2)) it require changes to pac4j as well?



Always, yes.



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