static_resources:
  listeners:
    - name: listener_8081
      address:
        socket_address:
          address: 0.0.0.0
          port_value: 8081
      filter_chains:
        - filters:
            - name: envoy.filters.network.http_connection_manager
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
                stat_prefix: ingress_http
                codec_type: AUTO

                http_filters:
                  - name: envoy.filters.http.lua
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua
                      inline_code: |
                        function envoy_on_response(response_handle)
                          local status = response_handle:headers():get(":status")
                          if status ~= "401" and status ~= "403" then
                            return
                          end

                          local grpc_status = "16"
                          local grpc_message = "Unauthenticated"
                          if status == "403" then
                            grpc_status = "7"
                            grpc_message = "Permission%20denied"
                          end

                          response_handle:headers():replace(":status", "200")
                          response_handle:headers():replace("content-type", "application/grpc-web-text+proto")
                          response_handle:headers():replace("grpc-status", grpc_status)
                          response_handle:headers():replace("grpc-message", grpc_message)
                          response_handle:body(true):setBytes("")
                        end

                  - name: envoy.filters.http.ext_authz
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.ext_authz.v3.ExtAuthz
                      transport_api_version: V3
                      http_service:
                        server_uri:
                          uri: http://${auth_filter_HOST}:${auth_filter_PORT}
                          cluster: auth_filter
                          timeout: 5s
                        authorization_request:
                          allowed_headers:
                            patterns:
                              - exact: session-token
                              - exact: app-key
                              - exact: api-key
                              - exact: content-type
                              - exact: x-grpc-web
                              - exact: grpc-timeout
                      failure_mode_allow: false

                  - name: envoy.filters.http.grpc_web
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.grpc_web.v3.GrpcWeb

                  - name: envoy.filters.http.cors
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.cors.v3.Cors

                  - name: envoy.filters.http.router
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router

                route_config:
                  name: local_route
                  virtual_hosts:
                    - name: backend
                      domains: ["${ENVOY_API_DOMAIN}"]
                      cors:
                        allow_origin_string_match:
                          - exact: "${CORS_ALLOW_ORIGIN}"
                        allow_methods: GET, PUT, DELETE, POST, OPTIONS
                        allow_headers: content-type,authorization,x-requested-with,x-grpc-web,x-user-agent,app-key,api-key,session-token,grpc-timeout
                        expose_headers: grpc-status,grpc-message,grpc-status-details-bin
                        max_age: "1728000"
                      routes:
                        - match:
                            prefix: /
                          route:
                            cluster: vascular_upstream
                            timeout: 30s

  clusters:
    - name: auth_filter
      type: STRICT_DNS
      connect_timeout: 5s
      lb_policy: ROUND_ROBIN
      typed_extension_protocol_options:
        envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
          "@type": type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
          explicit_http_config:
            http_protocol_options: {}
      load_assignment:
        cluster_name: auth_filter
        endpoints:
          - lb_endpoints:
              - endpoint:
                  address:
                    socket_address:
                      address: ${auth_filter_HOST}
                      port_value: ${auth_filter_PORT}

    - name: vascular_upstream
      type: STRICT_DNS
      dns_lookup_family: V4_ONLY
      connect_timeout: 5s
      lb_policy: ROUND_ROBIN
      typed_extension_protocol_options:
        envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
          "@type": type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
          explicit_http_config:
            http2_protocol_options: {}
      load_assignment:
        cluster_name: vascular_upstream
        endpoints:
          - lb_endpoints:
              - endpoint:
                  address:
                    socket_address:
                      address: ${vascular_upstream_HOST}
                      port_value: ${vascular_upstream_PORT}