// Copyright 2025 Envoy Project Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package envoy.config.cluster.v3;

import "envoy/config/core/v3/config_source.proto";

import "google/protobuf/any.proto";

import "udpa/annotations/status.proto";
import "udpa/annotations/versioning.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.config.cluster.v3";
option java_outer_classname = "FilterProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3;clusterv3";
option (udpa.annotations.file_status).package_version_status = ACTIVE;

// [#protodoc-title: Upstream network filters]
// Upstream network filters apply to the connections to the upstream cluster hosts.

message Filter {
  option (udpa.annotations.versioning).previous_message_type = "envoy.api.v2.cluster.Filter";

  // The name of the filter configuration.
  string name = 1 [(validate.rules).string = {min_len: 1}];

  // Filter specific configuration which depends on the filter being
  // instantiated. See the supported filters for further documentation.
  // Note that Envoy's :ref:`downstream network
  // filters <config_network_filters>` are not valid upstream network filters.
  // Only one of typed_config or config_discovery can be used.
  google.protobuf.Any typed_config = 2;

  // Configuration source specifier for an extension configuration discovery
  // service. In case of a failure and without the default configuration, the
  // listener closes the connections.
  // Only one of typed_config or config_discovery can be used.
  core.v3.ExtensionConfigSource config_discovery = 3;
}
