319 lines
12 KiB
Protocol Buffer
319 lines
12 KiB
Protocol Buffer
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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syntax = "proto3";
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package google.api;
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option cc_enable_arenas = true;
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option go_package = "api";
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option java_multiple_files = true;
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option java_outer_classname = "HttpProto";
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option java_package = "com.google.api";
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option objc_class_prefix = "GAPI";
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// Defines the HTTP configuration for an API service. It contains a list of
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// [HttpRule][google.api.HttpRule], each specifying the mapping of an RPC method
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// to one or more HTTP REST API methods.
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message Http {
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// A list of HTTP configuration rules that apply to individual API methods.
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//
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// **NOTE:** All service configuration rules follow "last one wins" order.
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repeated HttpRule rules = 1;
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// When set to true, URL path parmeters will be fully URI-decoded except in
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// cases of single segment matches in reserved expansion, where "%2F" will be
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// left encoded.
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//
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// The default behavior is to not decode RFC 6570 reserved characters in multi
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// segment matches.
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bool fully_decode_reserved_expansion = 2;
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}
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// `HttpRule` defines the mapping of an RPC method to one or more HTTP
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// REST API methods. The mapping specifies how different portions of the RPC
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// request message are mapped to URL path, URL query parameters, and
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// HTTP request body. The mapping is typically specified as an
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// `google.api.http` annotation on the RPC method,
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// see "google/api/annotations.proto" for details.
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//
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// The mapping consists of a field specifying the path template and
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// method kind. The path template can refer to fields in the request
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// message, as in the example below which describes a REST GET
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// operation on a resource collection of messages:
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//
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//
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// service Messaging {
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// rpc GetMessage(GetMessageRequest) returns (Message) {
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// option (google.api.http).get = "/v1/messages/{message_id}/{sub.subfield}";
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// }
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// }
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// message GetMessageRequest {
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// message SubMessage {
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// string subfield = 1;
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// }
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// string message_id = 1; // mapped to the URL
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// SubMessage sub = 2; // `sub.subfield` is url-mapped
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// }
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// message Message {
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// string text = 1; // content of the resource
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// }
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//
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// The same http annotation can alternatively be expressed inside the
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// `GRPC API Configuration` YAML file.
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//
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// http:
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// rules:
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// - selector: <proto_package_name>.Messaging.GetMessage
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// get: /v1/messages/{message_id}/{sub.subfield}
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//
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// This definition enables an automatic, bidrectional mapping of HTTP
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// JSON to RPC. Example:
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//
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// HTTP | RPC
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// -----|-----
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// `GET /v1/messages/123456/foo` | `GetMessage(message_id: "123456" sub: SubMessage(subfield: "foo"))`
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//
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// In general, not only fields but also field paths can be referenced
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// from a path pattern. Fields mapped to the path pattern cannot be
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// repeated and must have a primitive (non-message) type.
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//
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// Any fields in the request message which are not bound by the path
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// pattern automatically become (optional) HTTP query
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// parameters. Assume the following definition of the request message:
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//
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//
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// service Messaging {
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// rpc GetMessage(GetMessageRequest) returns (Message) {
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// option (google.api.http).get = "/v1/messages/{message_id}";
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// }
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// }
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// message GetMessageRequest {
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// message SubMessage {
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// string subfield = 1;
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// }
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// string message_id = 1; // mapped to the URL
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// int64 revision = 2; // becomes a parameter
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// SubMessage sub = 3; // `sub.subfield` becomes a parameter
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// }
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//
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//
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// This enables a HTTP JSON to RPC mapping as below:
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//
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// HTTP | RPC
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// -----|-----
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// `GET /v1/messages/123456?revision=2&sub.subfield=foo` | `GetMessage(message_id: "123456" revision: 2 sub: SubMessage(subfield: "foo"))`
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//
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// Note that fields which are mapped to HTTP parameters must have a
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// primitive type or a repeated primitive type. Message types are not
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// allowed. In the case of a repeated type, the parameter can be
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// repeated in the URL, as in `...?param=A¶m=B`.
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//
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// For HTTP method kinds which allow a request body, the `body` field
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// specifies the mapping. Consider a REST update method on the
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// message resource collection:
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//
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//
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// service Messaging {
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// rpc UpdateMessage(UpdateMessageRequest) returns (Message) {
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// option (google.api.http) = {
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// put: "/v1/messages/{message_id}"
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// body: "message"
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// };
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// }
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// }
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// message UpdateMessageRequest {
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// string message_id = 1; // mapped to the URL
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// Message message = 2; // mapped to the body
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// }
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//
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//
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// The following HTTP JSON to RPC mapping is enabled, where the
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// representation of the JSON in the request body is determined by
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// protos JSON encoding:
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//
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// HTTP | RPC
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// -----|-----
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// `PUT /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id: "123456" message { text: "Hi!" })`
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//
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// The special name `*` can be used in the body mapping to define that
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// every field not bound by the path template should be mapped to the
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// request body. This enables the following alternative definition of
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// the update method:
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//
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// service Messaging {
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// rpc UpdateMessage(Message) returns (Message) {
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// option (google.api.http) = {
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// put: "/v1/messages/{message_id}"
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// body: "*"
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// };
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// }
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// }
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// message Message {
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// string message_id = 1;
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// string text = 2;
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// }
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//
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//
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// The following HTTP JSON to RPC mapping is enabled:
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//
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// HTTP | RPC
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// -----|-----
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// `PUT /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id: "123456" text: "Hi!")`
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//
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// Note that when using `*` in the body mapping, it is not possible to
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// have HTTP parameters, as all fields not bound by the path end in
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// the body. This makes this option more rarely used in practice of
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// defining REST APIs. The common usage of `*` is in custom methods
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// which don't use the URL at all for transferring data.
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//
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// It is possible to define multiple HTTP methods for one RPC by using
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// the `additional_bindings` option. Example:
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//
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// service Messaging {
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// rpc GetMessage(GetMessageRequest) returns (Message) {
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// option (google.api.http) = {
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// get: "/v1/messages/{message_id}"
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// additional_bindings {
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// get: "/v1/users/{user_id}/messages/{message_id}"
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// }
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// };
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// }
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// }
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// message GetMessageRequest {
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// string message_id = 1;
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// string user_id = 2;
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// }
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//
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//
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// This enables the following two alternative HTTP JSON to RPC
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// mappings:
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//
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// HTTP | RPC
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// -----|-----
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// `GET /v1/messages/123456` | `GetMessage(message_id: "123456")`
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// `GET /v1/users/me/messages/123456` | `GetMessage(user_id: "me" message_id: "123456")`
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//
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// # Rules for HTTP mapping
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//
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// The rules for mapping HTTP path, query parameters, and body fields
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// to the request message are as follows:
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//
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// 1. The `body` field specifies either `*` or a field path, or is
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// omitted. If omitted, it indicates there is no HTTP request body.
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// 2. Leaf fields (recursive expansion of nested messages in the
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// request) can be classified into three types:
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// (a) Matched in the URL template.
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// (b) Covered by body (if body is `*`, everything except (a) fields;
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// else everything under the body field)
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// (c) All other fields.
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// 3. URL query parameters found in the HTTP request are mapped to (c) fields.
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// 4. Any body sent with an HTTP request can contain only (b) fields.
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//
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// The syntax of the path template is as follows:
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//
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// Template = "/" Segments [ Verb ] ;
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// Segments = Segment { "/" Segment } ;
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// Segment = "*" | "**" | LITERAL | Variable ;
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// Variable = "{" FieldPath [ "=" Segments ] "}" ;
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// FieldPath = IDENT { "." IDENT } ;
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// Verb = ":" LITERAL ;
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//
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// The syntax `*` matches a single path segment. The syntax `**` matches zero
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// or more path segments, which must be the last part of the path except the
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// `Verb`. The syntax `LITERAL` matches literal text in the path.
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//
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// The syntax `Variable` matches part of the URL path as specified by its
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// template. A variable template must not contain other variables. If a variable
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// matches a single path segment, its template may be omitted, e.g. `{var}`
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// is equivalent to `{var=*}`.
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//
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// If a variable contains exactly one path segment, such as `"{var}"` or
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// `"{var=*}"`, when such a variable is expanded into a URL path, all characters
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// except `[-_.~0-9a-zA-Z]` are percent-encoded. Such variables show up in the
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// Discovery Document as `{var}`.
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//
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// If a variable contains one or more path segments, such as `"{var=foo/*}"`
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// or `"{var=**}"`, when such a variable is expanded into a URL path, all
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// characters except `[-_.~/0-9a-zA-Z]` are percent-encoded. Such variables
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// show up in the Discovery Document as `{+var}`.
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//
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// NOTE: While the single segment variable matches the semantics of
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// [RFC 6570](https://tools.ietf.org/html/rfc6570) Section 3.2.2
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// Simple String Expansion, the multi segment variable **does not** match
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// RFC 6570 Reserved Expansion. The reason is that the Reserved Expansion
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// does not expand special characters like `?` and `#`, which would lead
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// to invalid URLs.
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//
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// NOTE: the field paths in variables and in the `body` must not refer to
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// repeated fields or map fields.
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message HttpRule {
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// Selects methods to which this rule applies.
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//
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// Refer to [selector][google.api.DocumentationRule.selector] for syntax details.
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string selector = 1;
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// Determines the URL pattern is matched by this rules. This pattern can be
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// used with any of the {get|put|post|delete|patch} methods. A custom method
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// can be defined using the 'custom' field.
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oneof pattern {
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// Used for listing and getting information about resources.
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string get = 2;
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// Used for updating a resource.
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string put = 3;
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// Used for creating a resource.
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string post = 4;
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// Used for deleting a resource.
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string delete = 5;
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// Used for updating a resource.
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string patch = 6;
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// The custom pattern is used for specifying an HTTP method that is not
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// included in the `pattern` field, such as HEAD, or "*" to leave the
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// HTTP method unspecified for this rule. The wild-card rule is useful
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// for services that provide content to Web (HTML) clients.
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CustomHttpPattern custom = 8;
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}
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// The name of the request field whose value is mapped to the HTTP body, or
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// `*` for mapping all fields not captured by the path pattern to the HTTP
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// body. NOTE: the referred field must not be a repeated field and must be
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// present at the top-level of request message type.
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string body = 7;
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// Optional. The name of the response field whose value is mapped to the HTTP
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// body of response. Other response fields are ignored. When
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// not set, the response message will be used as HTTP body of response.
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string response_body = 12;
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// Additional HTTP bindings for the selector. Nested bindings must
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// not contain an `additional_bindings` field themselves (that is,
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// the nesting may only be one level deep).
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repeated HttpRule additional_bindings = 11;
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}
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// A custom pattern is used for defining custom HTTP verb.
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message CustomHttpPattern {
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// The name of this custom HTTP verb.
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string kind = 1;
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// The path matched by this custom verb.
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string path = 2;
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}
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