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To authenticate users using the university API, all you need to do is to write an authentication backend. You can then create a local user for these uni users the first time they login, since there is only two required fields: username and password. You can use set_unusable_password() so check_password() for this user will never return True.
The Django admin system is tightly coupled to the Django User object
described at the beginning of this document. For now, the best way to
deal with this is to create a Django User object for each user that
exists for your backend (e.g., in your LDAP directory, your external
SQL database, etc.) You can either write a script to do this in
advance, or your authenticate method can do it the first time a user
logs in.