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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
syntax = "proto2";
option optimize_for = LITE_RUNTIME;
package extensions.api.cast_channel;
message CastMessage {
// Always pass a version of the protocol for future compatibility
// requirements.
enum ProtocolVersion {
CASTV2_1_0 = 0;
}
required ProtocolVersion protocol_version = 1;
// source and destination ids identify the origin and destination of the
// message. They are used to route messages between endpoints that share a
// device-to-device channel.
//
// For messages between applications:
// - The sender application id is a unique identifier generated on behalf of
// the sender application.
// - The receiver id is always the the session id for the application.
//
// For messages to or from the sender or receiver platform, the special ids
// 'sender-0' and 'receiver-0' can be used.
//
// For messages intended for all endpoints using a given channel, the
// wildcard destination_id '*' can be used.
required string source_id = 2;
required string destination_id = 3;
// This is the core multiplexing key. All messages are sent on a namespace
// and endpoints sharing a channel listen on one or more namespaces. The
// namespace defines the protocol and semantics of the message.
required string namespace = 4;
// Encoding and payload info follows.
// What type of data do we have in this message.
enum PayloadType {
STRING = 0;
BINARY = 1;
}
required PayloadType payload_type = 5;
// Depending on payload_type, exactly one of the following optional fields
// will always be set.
optional string payload_utf8 = 6;
optional bytes payload_binary = 7;
}
// Messages for authentication protocol between a sender and a receiver.
message AuthChallenge {
}
message AuthResponse {
required bytes signature = 1;
required bytes client_auth_certificate = 2;
}
message AuthError {
enum ErrorType {
INTERNAL_ERROR = 0;
NO_TLS = 1; // The underlying connection is not TLS
}
required ErrorType error_type = 1;
}
message DeviceAuthMessage {
// Request fields
optional AuthChallenge challenge = 1;
// Response fields
optional AuthResponse response = 2;
optional AuthError error = 3;
}
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