Support for wildcard host/multiple hosts

[pbusko]

Description

At the moment, each APIRule object is bound to single external URL, however the underlying VirtualService object is capable of serving multiple hosts at the same time, or use regex matchers for the Host header.

Example with regex matcher (will match a-http-echo.my.domain.com, b-http-echo.my.domain.com etc.):

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: http-echo
  namespace: http-echo
spec:
  gateways:
    - kyma-system/kyma-gateway
  hosts:
    - '*'
  http:
    - corsPolicy:
        allowHeaders:
          - Authorization
          - Content-Type
          - '*'
        allowMethods:
          - GET
          - POST
          - PUT
          - DELETE
          - PATCH
        allowOrigins:
          - regex: .*
      match:
        - uri:
            regex: /.*
          headers:
            Host:
              regex: ^(.*)-http-echo\.my\.domain\.com$
      route:
        - weight: 100
          destination:
            host: http-echo.http-echo.svc.cluster.local

Example with multiple hosts:

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: http-echo
  namespace: http-echo
spec:
  gateways:
    - kyma-system/kyma-gateway
  hosts:
    - 'a-http-echo.my.domain.com'
    - 'b-http-echo.my.domain.com'
  http:
    - corsPolicy:
        allowHeaders:
          - Authorization
          - Content-Type
          - '*'
        allowMethods:
          - GET
          - POST
          - PUT
          - DELETE
          - PATCH
        allowOrigins:
          - regex: .*
      match:
        - uri:
            regex: /.*
      route:
        - weight: 100
          destination:
            host: http-echo.http-echo.svc.cluster.local

Would be very helpful to have support from APIRule for such use cases, by either introducing new spec.hosts array, or making spec.host regex capable by switching to the Host header regex matcher (or both).

Reasons

These features would greatly improve Kyma support for Multitenant CAP applications, which are using SaaS Registry Service.
At the moment there's no easy way to handle multitenant URLs on Kyma.

DoD:

• provide documentation
• release notes and What's New updates for Kyma customers
• provide unit tests
• provide integration tests
• test on production-like environment
• verify resource limits
• followup issue
• create release and bump in kyma
• PR reviewer will verify code coverage and evaluate if it is acceptable

Attachments

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[strekm]

pre-req: #1159