Apply Configuration of SnippetsFilter to NGINX

[mpstefan]

As a user of NGF
I want my SnippetsFilter configuration applied to NGF's data plane
So that I can leverage NGINX features not yet available in NGF.

Acceptance

• The SnippetsFilters is validated to ensure it only contains valid contexts:
  • main
  • http
  • server
  • location
• The SnippetsFilter only allows one snippet per context.
• If a resolvedRef of a SnippetsFilter is found to be invalid for a given Route rule, that Route rule is configured to return a service unavailable response that is appropriate for the route.
• Configuration defined in a filter attached to a route rule applies the NGINX directive configuration specified in the filter.
• SnippetsFilters are disabled by default
• SnippetsFilters must be explicitly enabled.

Tasks

Beta Give feedback

1. Register SnippetsFilter controller if feature is enabled
2. Validate SnippetsFilters add add to the graph
3. Apply SnippetsFilter to NGINX config