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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;
+}