apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: golang-filter
spec:
  workloadSelector:
    labels:
      app: httpbin
  configPatches:
    # The first patch adds the lua filter to the listener/http connection manager
  - applyTo: HTTP_FILTER
    match:
      context: SIDECAR_INBOUND
      listener:
        filterChain:
          filter:
            name: envoy.http_connection_manager
            subFilter:
              name: envoy.router
    patch:
      operation: INSERT_BEFORE
      value: # lua filter specification
        name: envoy.filters.http.wasm
        typed_config:
          '@type': type.googleapis.com/udpa.type.v1.TypedStruct
          type_url: type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
          value:
            config:
              vm_config:
                code:
                  local:
                    filename: /var/local/wasm/http-filter.wasm
                runtime: envoy.wasm.runtime.v8