Interesting, this neatly divides authorization checks into three-ish questions: 1. What roles are assigned to the user?, 2. What tags are assigned to the resour

Interesting, this neatly divides authorization checks into three-ish questions: 1. What roles are assigned to the user?, 2. What tags are assigned to the resource?, 3. Do the answers to 1 and 2 overlap? Each of which could have a cached denormalized index and should compress well.