| // 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 |