def realms(self, filter={}):
        #return [ opus.lib.prov.Realm(...), ...]
        raise NotImplementedError()
Returns an instance of :class:`Auth` from the request registry.
dataset/ETHPy150Open bmbouter/Opus/opus/lib/prov/driver_base.py/DriverBase.realms--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/webapp2-2.3/webapp2_extras/auth.py/get_auth