Overriding IdP's entityID per Relying Party

[Nate Klingenstein]

Running v3.2.1, I need to override the entityID of the issuer of assertions based on the relying party entityID.

This was done with the old provider="https://urls.are.the.new.urns/idp/shibboleth” setting in legacy 2.4 configuration, but I can’t find any analogous SAML2.SSO profileConfiguration override.

I see where idp.entityID is defined in idp.properties and where I could do stupid things in the system/ directory, but is there a proper way to do this?

Searched here:

https://wiki.shibboleth.net/confluence/display/IDP30/RelyingPartyConfiguration
https://build.shibboleth.net/jenkins/job/java-identity-provider-nightly/javadoc/net/shibboleth/idp/saml/saml2/profile/config/BrowserSSOProfileConfiguration.html