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Gateway API Policy Attachment playground

Kuadrant is trying to figure how to best implement the default & override hierarchy, as proposed by the specification. This is done in two different contexts:

  • AuthPolicy, providing externalized authn/z to your services; and
  • RateLimitPolicy, which lets you rate limit the access to your services from within the gateway.

The Playground

This simple playground aims at providing a space to programmatically test out different Policy "languages" (i.e. how do you declaratively express these constraints) while supporting the default and override concepts.

The idea is to use test code, to spec your Policy and most importantly your merging algorithm for these and use the tests as specification for what the expected outcome to applying these different Policyies would be.

Some quick examples

  • How would a cluster operator express that any traffic to the cluster needs some sort of authentication, while leaving it to the application developer to specify how that authentication happens?
  • How would a cluster operator require authentication with the company SSO, while the application developer specifies what role a user of the app would need for certain end-points?
  • How does a cluster operator rate limits a whole subnet of clients, while the application developer bypasses it for authenticated admin users from that same subnet?
  • … more?

Ideas behind the playground

  • The array of Policyies is meant to represent "time ordering" of Policy CRs, as the "oldest" has precedence.
  • It builds on the assumption that a Policy merge is only required once a Service will be hit, i.e. at the HTTPRoute level.
  • Actual use cases should only require a _test.go file, with the Policy under test and a Merger function that knows about the semantic of the Policy and the possible "language" used (e.g. the user could submit a Policy CR with fields different from the actual resulting Policy applied, following the "merge").
  • … more?