[control-plane] List applying policies in KafkaSinks .status.policies

[creydr]

As the Eventing Authorization feature track describes, target resources of EventPolicies, will reflect in their status, which EventPolicy is applied to them.

For example:

apiVersion: kafkasinks.eventing.knative.dev
kind: KafkaSink
metadata:
  name: my-sink
spec:
  ...
status:
  ...
  policies:
    - name: event-policy
      apiVersion: v1alpha1
    - name: another-event-policy
      apiVersion: v1alpha1

  conditions:
    - type: Ready
      status: "True"
    - type: EventPoliciesReady
      status: "True"

As the KafkaSink should support EventPolicies, wee need to do the following:

• Update the KafkaSink reconciler to show applying policies in the KafkaSinks .status.policies and set the KafkaSinks EventPoliciesReady condition. Also watch EventPolicies for changes.
• Set EventPoliciesReady condition to true, in case no policy applies, and set message according to the default-authorization-mode (e.g. Default authorization mode is 'allow-all'). Check the Default Authorization Mode section in the feature track for additional information.

Hints:

• Requires Update KafkaSink and KafkaChannel type and CRD to support exposing applying EventPolicies #4069

Additional hints for new contributors before starting with this issue:

1. When the issue has the Draft status, the issue is subject to change and thus should not be started to be worked on
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3. Make sure you're able to run Knative Eventing locally with Knative Eventing Kafka and run at least the unit tests.
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[creydr]

/help
/triage accepted

[knative-prow]

@creydr:
This request has been marked as needing help from a contributor.

Please ensure the request meets the requirements listed here.

If this request no longer meets these requirements, the label can be removed
by commenting with the /remove-help command.

In response to this:

/help
/triage accepted

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[Cali0707]

/area control-plane

[creydr]

/assign