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// Copyright 2020 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.
#include "cast/streaming/sender_message.h"
#include <utility>
#include "absl/strings/ascii.h"
#include "cast/streaming/message_fields.h"
#include "util/base64.h"
#include "util/enum_name_table.h"
#include "util/json/json_helpers.h"
#include "util/json/json_serialization.h"
namespace openscreen {
namespace cast {
namespace {
EnumNameTable<SenderMessage::Type, 4> kMessageTypeNames{
{{kMessageTypeOffer, SenderMessage::Type::kOffer},
{"GET_STATUS", SenderMessage::Type::kGetStatus},
{"GET_CAPABILITIES", SenderMessage::Type::kGetCapabilities},
{"RPC", SenderMessage::Type::kRpc}}};
SenderMessage::Type GetMessageType(const Json::Value& root) {
std::string type;
if (!json::ParseAndValidateString(root[kMessageType], &type)) {
return SenderMessage::Type::kUnknown;
}
absl::AsciiStrToUpper(&type);
ErrorOr<SenderMessage::Type> parsed = GetEnum(kMessageTypeNames, type);
return parsed.value(SenderMessage::Type::kUnknown);
}
} // namespace
// static
ErrorOr<SenderMessage> SenderMessage::Parse(const Json::Value& value) {
if (!value) {
return Error(Error::Code::kParameterInvalid, "Empty JSON");
}
SenderMessage message;
message.type = GetMessageType(value);
if (!json::ParseAndValidateInt(value[kSequenceNumber],
&(message.sequence_number))) {
message.sequence_number = -1;
}
if (message.type == SenderMessage::Type::kOffer) {
ErrorOr<Offer> offer = Offer::Parse(value[kOfferMessageBody]);
if (offer.is_value()) {
message.body = std::move(offer.value());
message.valid = true;
}
} else if (message.type == SenderMessage::Type::kRpc) {
std::string rpc_body;
if (json::ParseAndValidateString(value[kRpcMessageBody], &rpc_body) &&
base64::Decode(rpc_body, &rpc_body)) {
message.body = rpc_body;
message.valid = true;
}
} else if (message.type == SenderMessage::Type::kGetStatus ||
message.type == SenderMessage::Type::kGetCapabilities) {
// These types of messages just don't have a body.
message.valid = true;
}
return message;
}
ErrorOr<Json::Value> SenderMessage::ToJson() const {
OSP_CHECK(type != SenderMessage::Type::kUnknown)
<< "Trying to send an unknown message is a developer error";
Json::Value root;
ErrorOr<const char*> message_type = GetEnumName(kMessageTypeNames, type);
root[kMessageType] = message_type.value();
if (sequence_number >= 0) {
root[kSequenceNumber] = sequence_number;
}
switch (type) {
case SenderMessage::Type::kOffer:
root[kOfferMessageBody] = absl::get<Offer>(body).ToJson().value();
break;
case SenderMessage::Type::kRpc:
root[kRpcMessageBody] = base64::Encode(absl::get<std::string>(body));
break;
case SenderMessage::Type::kGetCapabilities: // fallthrough
case SenderMessage::Type::kGetStatus:
break;
default:
OSP_NOTREACHED();
}
return root;
}
} // namespace cast
} // namespace openscreen
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