su.litvak.justdlna.chromecast.v2.cast_channel.proto Maven / Gradle / Ivy

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// Copyright 2014 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 su.litvak.chromecast.api.v2;

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;
}

enum SignatureAlgorithm {
    UNSPECIFIED = 0;
    RSASSA_PKCS1v15 = 1;
    RSASSA_PSS = 2;
}

// Messages for authentication protocol between a sender and a receiver.
message AuthChallenge {
    optional SignatureAlgorithm signature_algorithm = 1
    [default = RSASSA_PKCS1v15];
}

message AuthResponse {
    required bytes signature = 1;
    required bytes client_auth_certificate = 2;
    repeated bytes intermediate_certificate = 3;
    optional SignatureAlgorithm signature_algorithm = 4
    [default = RSASSA_PKCS1v15];
}

message AuthError {
    enum ErrorType {
        INTERNAL_ERROR = 0;
        NO_TLS = 1;  // The underlying connection is not TLS
        SIGNATURE_ALGORITHM_UNAVAILABLE = 2;
    }
    required ErrorType error_type = 1;
}

message DeviceAuthMessage {
    // Request fields
    optional AuthChallenge challenge = 1;
    // Response fields
    optional AuthResponse response = 2;
    optional AuthError error = 3;
}