By wrapping a HathiTrust handle with a single sign-on URL, it is possible to construct a link to a HathiTrust resource that automatically passes users from HathiTrust partner institutions through their institution's authentication service, effectively "automatically" logging them into HathiTrust.
URLs must be constructed in the following way:
Where $ID is the HathiTrust resource and $ENTITY_ID is your Shibboleth IDP.
For example, given the handle
...and a Shibboleth IDP
...you can append the "signon" parameter to automatically pass users through your institution's Shibboleth IDP:
Please contact firstname.lastname@example.org  with any questions or comments.