1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 option optimize_for = LITE_RUNTIME;
9 package extensions.api.cast_channel;
12 // Always pass a version of the protocol for future compatibility
14 enum ProtocolVersion {
17 required ProtocolVersion protocol_version = 1;
19 // source and destination ids identify the origin and destination of the
20 // message. They are used to route messages between endpoints that share a
21 // device-to-device channel.
23 // For messages between applications:
24 // - The sender application id is a unique identifier generated on behalf of
25 // the sender application.
26 // - The receiver id is always the the session id for the application.
28 // For messages to or from the sender or receiver platform, the special ids
29 // 'sender-0' and 'receiver-0' can be used.
31 // For messages intended for all endpoints using a given channel, the
32 // wildcard destination_id '*' can be used.
33 required string source_id = 2;
34 required string destination_id = 3;
36 // This is the core multiplexing key. All messages are sent on a namespace
37 // and endpoints sharing a channel listen on one or more namespaces. The
38 // namespace defines the protocol and semantics of the message.
39 required string namespace = 4;
41 // Encoding and payload info follows.
43 // What type of data do we have in this message.
48 required PayloadType payload_type = 5;
50 // Depending on payload_type, exactly one of the following optional fields
51 // will always be set.
52 optional string payload_utf8 = 6;
53 optional bytes payload_binary = 7;
56 // Messages for authentication protocol between a sender and a receiver.
57 message AuthChallenge {
60 message AuthResponse {
61 required bytes signature = 1;
62 required bytes client_auth_certificate = 2;
68 NO_TLS = 1; // The underlying connection is not TLS
70 required ErrorType error_type = 1;
73 message DeviceAuthMessage {
75 optional AuthChallenge challenge = 1;
77 optional AuthResponse response = 2;
78 optional AuthError error = 3;