Oso
Oso is a batteries-included framework for building authorization
...Model: Set up common permissions patterns like RBAC and relationships using Oso’s built-in primitives. Extend them however you need with Oso’s declarative policy language, Polar. Filter: Go beyond yes/no authorization questions. Implement authorization over collections too - e.g., “Show me only the records that Juno can see.” Test: Write unit tests over your authorization logic now that you have a single interface for it. Use the debugger or tracing to track down unexpected behavior. Oso lets you write policies to control who can do what in your app. ...