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// Copyright 2025 Google LLC
//
// 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 google.api;
option go_package = "google.golang.org/genproto/googleapis/api/serviceconfig;serviceconfig";
option java_multiple_files = true;
option java_outer_classname = "BackendProto";
option java_package = "com.google.api";
option objc_class_prefix = "GAPI";
// `Backend` defines the backend configuration for a service.
message Backend {
// A list of API backend rules that apply to individual API methods.
//
// **NOTE:** All service configuration rules follow "last one wins" order.
repeated BackendRule rules = 1;
}
// A backend rule provides configuration for an individual API element.
message BackendRule {
// Path Translation specifies how to combine the backend address with the
// request path in order to produce the appropriate forwarding URL for the
// request.
//
// Path Translation is applicable only to HTTP-based backends. Backends which
// do not accept requests over HTTP/HTTPS should leave `path_translation`
// unspecified.
enum PathTranslation {
PATH_TRANSLATION_UNSPECIFIED = 0;
// Use the backend address as-is, with no modification to the path. If the
// URL pattern contains variables, the variable names and values will be
// appended to the query string. If a query string parameter and a URL
// pattern variable have the same name, this may result in duplicate keys in
// the query string.
//
// # Examples
//
// Given the following operation config:
//
// Method path: /api/company/{cid}/user/{uid}
// Backend address: https://example.cloudfunctions.net/getUser
//
// Requests to the following request paths will call the backend at the
// translated path:
//
// Request path: /api/company/widgetworks/user/johndoe
// Translated:
// https://example.cloudfunctions.net/getUser?cid=widgetworks&uid=johndoe
//
// Request path: /api/company/widgetworks/user/johndoe?timezone=EST
// Translated:
// https://example.cloudfunctions.net/getUser?timezone=EST&cid=widgetworks&uid=johndoe
CONSTANT_ADDRESS = 1;
// The request path will be appended to the backend address.
//
// # Examples
//
// Given the following operation config:
//
// Method path: /api/company/{cid}/user/{uid}
// Backend address: https://example.appspot.com
//
// Requests to the following request paths will call the backend at the
// translated path:
//
// Request path: /api/company/widgetworks/user/johndoe
// Translated:
// https://example.appspot.com/api/company/widgetworks/user/johndoe
//
// Request path: /api/company/widgetworks/user/johndoe?timezone=EST
// Translated:
// https://example.appspot.com/api/company/widgetworks/user/johndoe?timezone=EST
APPEND_PATH_TO_ADDRESS = 2;
}
// Selects the methods to which this rule applies.
//
// Refer to [selector][google.api.DocumentationRule.selector] for syntax
// details.
string selector = 1;
// The address of the API backend.
//
// The scheme is used to determine the backend protocol and security.
// The following schemes are accepted:
//
// SCHEME PROTOCOL SECURITY
// http:// HTTP None
// https:// HTTP TLS
// grpc:// gRPC None
// grpcs:// gRPC TLS
//
// It is recommended to explicitly include a scheme. Leaving out the scheme
// may cause constrasting behaviors across platforms.
//
// If the port is unspecified, the default is:
// - 80 for schemes without TLS
// - 443 for schemes with TLS
//
// For HTTP backends, use [protocol][google.api.BackendRule.protocol]
// to specify the protocol version.
string address = 2;
// The number of seconds to wait for a response from a request. The default
// varies based on the request protocol and deployment environment.
double deadline = 3;
// Deprecated, do not use.
double min_deadline = 4 [deprecated = true];
// The number of seconds to wait for the completion of a long running
// operation. The default is no deadline.
double operation_deadline = 5;
PathTranslation path_translation = 6;
// Authentication settings used by the backend.
//
// These are typically used to provide service management functionality to
// a backend served on a publicly-routable URL. The `authentication`
// details should match the authentication behavior used by the backend.
//
// For example, specifying `jwt_audience` implies that the backend expects
// authentication via a JWT.
//
// When authentication is unspecified, the resulting behavior is the same
// as `disable_auth` set to `true`.
//
// Refer to https://developers.google.com/identity/protocols/OpenIDConnect for
// JWT ID token.
oneof authentication {
// The JWT audience is used when generating a JWT ID token for the backend.
// This ID token will be added in the HTTP "authorization" header, and sent
// to the backend.
string jwt_audience = 7;
// When disable_auth is true, a JWT ID token won't be generated and the
// original "Authorization" HTTP header will be preserved. If the header is
// used to carry the original token and is expected by the backend, this
// field must be set to true to preserve the header.
bool disable_auth = 8;
}
// The protocol used for sending a request to the backend.
// The supported values are "http/1.1" and "h2".
//
// The default value is inferred from the scheme in the
// [address][google.api.BackendRule.address] field:
//
// SCHEME PROTOCOL
// http:// http/1.1
// https:// http/1.1
// grpc:// h2
// grpcs:// h2
//
// For secure HTTP backends (https://) that support HTTP/2, set this field
// to "h2" for improved performance.
//
// Configuring this field to non-default values is only supported for secure
// HTTP backends. This field will be ignored for all other backends.
//
// See
// https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids
// for more details on the supported values.
string protocol = 9;
// The map between request protocol and the backend address.
map<string, BackendRule> overrides_by_request_protocol = 10;
}