cast/streaming/sender_message.h

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CAST_STREAMING_SENDER_MESSAGE_H_
#define CAST_STREAMING_SENDER_MESSAGE_H_

#include <memory>
#include <string>
#include <variant>
#include <vector>

#include "cast/streaming/public/offer_messages.h"
#include "json/value.h"
#include "platform/base/error.h"
#include "util/osp_logging.h"

namespace openscreen::cast {

struct SenderMessage {
 public:
  // Receiver response message type.
  enum class Type {
    // Unknown message type.
    kUnknown,

    // OFFER request message.
    kOffer,

    // GET_CAPABILITIES request message.
    kGetCapabilities,

    // Rpc binary messages. The payload is base64-encoded.
    kRpc,

    // Input-related binary messages. The payload is base64-encoded.
    kInput,
  };

  static ErrorOr<SenderMessage> Parse(const Json::Value& value);
  ErrorOr<Json::Value> ToJson() const;

  Type type = Type::kUnknown;
  int32_t sequence_number = -1;
  bool valid = false;
  std::variant<std::monostate,
               std::vector<uint8_t>,  // Binary-encoded protobuf message.
               Offer,
               std::string>
      body;
};

}  // namespace openscreen::cast

#endif  // CAST_STREAMING_SENDER_MESSAGE_H_