syntax = "proto3";

package envoy.api.v3alpha;

option java_outer_classname = "RdsProto";
option java_multiple_files = true;
option java_package = "io.envoyproxy.envoy.api.v3alpha";
option java_generic_services = true;

import "envoy/api/v3alpha/core/base.proto";
import "envoy/api/v3alpha/core/config_source.proto";
import "envoy/api/v3alpha/discovery.proto";
import "envoy/api/v3alpha/route/route.proto";

import "google/api/annotations.proto";
import "google/protobuf/wrappers.proto";

import "udpa/api/annotations/versioning.proto";

import "validate/validate.proto";

// [#protodoc-title: HTTP route configuration]
// * Routing :ref:`architecture overview <arch_overview_http_routing>`
// * HTTP :ref:`router filter <config_http_filters_router>`

// The resource_names field in DiscoveryRequest specifies a route configuration.
// This allows an Envoy configuration with multiple HTTP listeners (and
// associated HTTP connection manager filters) to use different route
// configurations. Each listener will bind its HTTP connection manager filter to
// a route table via this identifier.
service RouteDiscoveryService {
  rpc StreamRoutes(stream DiscoveryRequest) returns (stream DiscoveryResponse) {
  }

  rpc DeltaRoutes(stream DeltaDiscoveryRequest) returns (stream DeltaDiscoveryResponse) {
  }

  rpc FetchRoutes(DiscoveryRequest) returns (DiscoveryResponse) {
    option (google.api.http) = {
      post: "/v3alpha/discovery:routes"
      body: "*"
    };
  }
}

// Virtual Host Discovery Service (VHDS) is used to dynamically update the list of virtual hosts for
// a given RouteConfiguration. If VHDS is configured a virtual host list update will be triggered
// during the processing of an HTTP request if a route for the request cannot be resolved. The
// :ref:`resource_names_subscribe
// <envoy_api_field_api.v3alpha.DeltaDiscoveryRequest.resource_names_subscribe>` field contains a
// list of virtual host names or aliases to track. The contents of an alias would be the contents of
// a *host* or *authority* header used to make an http request. An xDS server will match an alias to
// a virtual host based on the content of :ref:`domains'
// <envoy_api_field_api.v3alpha.route.VirtualHost.domains>` field. The *resource_names_unsubscribe*
// field contains a list of virtual host names that have been :ref:`unsubscribed
// <xds_protocol_unsubscribe>` from the routing table associated with the RouteConfiguration.
service VirtualHostDiscoveryService {
  rpc DeltaVirtualHosts(stream DeltaDiscoveryRequest) returns (stream DeltaDiscoveryResponse) {
  }
}

// [#next-free-field: 11]
message RouteConfiguration {
  option (udpa.api.annotations.versioning).previous_message_type =
      "envoy.api.v2.RouteConfiguration";

  // The name of the route configuration. For example, it might match
  // :ref:`route_config_name
  // <envoy_api_field_config.filter.network.http_connection_manager.v3alpha.Rds.route_config_name>`
  // in :ref:`envoy_api_msg_config.filter.network.http_connection_manager.v2.Rds`.
  string name = 1;

  // An array of virtual hosts that make up the route table.
  repeated route.VirtualHost virtual_hosts = 2;

  // An array of virtual hosts will be dynamically loaded via the VHDS API.
  // Both *virtual_hosts* and *vhds* fields will be used when present. *virtual_hosts* can be used
  // for a base routing table or for infrequently changing virtual hosts. *vhds* is used for
  // on-demand discovery of virtual hosts. The contents of these two fields will be merged to
  // generate a routing table for a given RouteConfiguration, with *vhds* derived configuration
  // taking precedence.
  // [#not-implemented-hide:]
  Vhds vhds = 9;

  // Optionally specifies a list of HTTP headers that the connection manager
  // will consider to be internal only. If they are found on external requests they will be cleaned
  // prior to filter invocation. See :ref:`config_http_conn_man_headers_x-envoy-internal` for more
  // information.
  repeated string internal_only_headers = 3;

  // Specifies a list of HTTP headers that should be added to each response that
  // the connection manager encodes. Headers specified at this level are applied
  // after headers from any enclosed :ref:`envoy_api_msg_route.VirtualHost` or
  // :ref:`envoy_api_msg_route.RouteAction`. For more information, including details on
  // header value syntax, see the documentation on :ref:`custom request headers
  // <config_http_conn_man_headers_custom_request_headers>`.
  repeated core.HeaderValueOption response_headers_to_add = 4
      [(validate.rules).repeated = {max_items: 1000}];

  // Specifies a list of HTTP headers that should be removed from each response
  // that the connection manager encodes.
  repeated string response_headers_to_remove = 5;

  // Specifies a list of HTTP headers that should be added to each request
  // routed by the HTTP connection manager. Headers specified at this level are
  // applied after headers from any enclosed :ref:`envoy_api_msg_route.VirtualHost` or
  // :ref:`envoy_api_msg_route.RouteAction`. For more information, including details on
  // header value syntax, see the documentation on :ref:`custom request headers
  // <config_http_conn_man_headers_custom_request_headers>`.
  repeated core.HeaderValueOption request_headers_to_add = 6
      [(validate.rules).repeated = {max_items: 1000}];

  // Specifies a list of HTTP headers that should be removed from each request
  // routed by the HTTP connection manager.
  repeated string request_headers_to_remove = 8;

  // By default, headers that should be added/removed are evaluated from most to least specific:
  //
  // * route level
  // * virtual host level
  // * connection manager level
  //
  // To allow setting overrides at the route or virtual host level, this order can be reversed
  // by setting this option to true. Defaults to false.
  //
  // [#next-major-version: In the v3 API, this will default to true.]
  bool most_specific_header_mutations_wins = 10;

  // An optional boolean that specifies whether the clusters that the route
  // table refers to will be validated by the cluster manager. If set to true
  // and a route refers to a non-existent cluster, the route table will not
  // load. If set to false and a route refers to a non-existent cluster, the
  // route table will load and the router filter will return a 404 if the route
  // is selected at runtime. This setting defaults to true if the route table
  // is statically defined via the :ref:`route_config
  // <envoy_api_field_config.filter.network.http_connection_manager.v3alpha.HttpConnectionManager.route_config>`
  // option. This setting default to false if the route table is loaded dynamically via the
  // :ref:`rds
  // <envoy_api_field_config.filter.network.http_connection_manager.v3alpha.HttpConnectionManager.rds>`
  // option. Users may wish to override the default behavior in certain cases (for example when
  // using CDS with a static route table).
  google.protobuf.BoolValue validate_clusters = 7;
}

// [#not-implemented-hide:]
message Vhds {
  option (udpa.api.annotations.versioning).previous_message_type = "envoy.api.v2.Vhds";

  // Configuration source specifier for VHDS.
  core.ConfigSource config_source = 1 [(validate.rules).message = {required: true}];
}