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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef PLATFORM_IMPL_WINDOWS_BLUETOOTH_CLASSIC_SERVER_SOCKET_H_
#define PLATFORM_IMPL_WINDOWS_BLUETOOTH_CLASSIC_SERVER_SOCKET_H_
#include <Windows.h>
#include <queue>
#include "platform/api/bluetooth_classic.h"
#include "platform/impl/windows/bluetooth_classic_socket.h"
#include "platform/impl/windows/generated/winrt/Windows.Devices.Bluetooth.Rfcomm.h"
#include "platform/impl/windows/generated/winrt/Windows.Foundation.h"
#include "platform/impl/windows/generated/winrt/Windows.Networking.Sockets.h"
#include "platform/impl/windows/generated/winrt/base.h"
namespace location {
namespace nearby {
namespace windows {
// Supports listening for an incoming network connection using Bluetooth RFCOMM.
// https://docs.microsoft.com/en-us/uwp/api/windows.networking.sockets.streamsocketlistener?view=winrt-20348
using winrt::Windows::Networking::Sockets::StreamSocketListener;
// Provides data for a ConnectionReceived event on a StreamSocketListener
// object.
// https://docs.microsoft.com/en-us/uwp/api/windows.networking.sockets.streamsocketlistenerconnectionreceivedeventargs?view=winrt-20348
using winrt::Windows::Networking::Sockets::
StreamSocketListenerConnectionReceivedEventArgs;
// Represents an asynchronous action.
// https://docs.microsoft.com/en-us/uwp/api/windows.foundation.iasyncaction?view=winrt-20348
using winrt::Windows::Foundation::IAsyncAction;
// Specifies the quality of service for a StreamSocket object.
// https://docs.microsoft.com/en-us/uwp/api/windows.networking.sockets.socketqualityofservice?view=winrt-20348
using winrt::Windows::Networking::Sockets::SocketQualityOfService;
// Represents an instance of a local RFCOMM service.
// https://docs.microsoft.com/en-us/uwp/api/windows.devices.bluetooth.rfcomm.rfcommserviceprovider?view=winrt-20348
using winrt::Windows::Devices::Bluetooth::Rfcomm::RfcommServiceProvider;
// Represents an RFCOMM service ID.
// https://docs.microsoft.com/en-us/uwp/api/windows.devices.bluetooth.rfcomm.rfcommserviceid?view=winrt-20348
using winrt::Windows::Devices::Bluetooth::Rfcomm::RfcommServiceId;
// Writes data to an output stream.
// https://docs.microsoft.com/en-us/uwp/api/windows.storage.streams.datawriter?view=winrt-20348
using winrt::Windows::Storage::Streams::DataWriter;
// Specifies the type of character encoding for a stream.
// https://docs.microsoft.com/en-us/uwp/api/windows.storage.streams.unicodeencoding?view=winrt-20348
using winrt::Windows::Storage::Streams::UnicodeEncoding;
// Specifies the level of encryption to use on a StreamSocket object.
// https://docs.microsoft.com/en-us/uwp/api/windows.networking.sockets.socketprotectionlevel?view=winrt-22000
using winrt::Windows::Networking::Sockets::SocketProtectionLevel;
// https://developer.android.com/reference/android/bluetooth/BluetoothServerSocket.html.
class BluetoothServerSocket : public api::BluetoothServerSocket {
public:
BluetoothServerSocket(const std::string service_name,
const std::string service_uuid);
~BluetoothServerSocket() override;
// https://developer.android.com/reference/android/bluetooth/BluetoothServerSocket.html#accept()
//
// Blocks until either:
// - at least one incoming connection request is available, or
// - ServerSocket is closed.
// On success, returns connected socket, ready to exchange data.
// Returns nullptr on error.
// Once error is reported, it is permanent, and ServerSocket has to be closed.
std::unique_ptr<api::BluetoothSocket> Accept() override;
// https://developer.android.com/reference/android/bluetooth/BluetoothServerSocket.html#close()
//
// Returns Exception::kIo on error, Exception::kSuccess otherwise.
Exception Close() override;
Exception StartListening(bool radioDiscoverable);
void SetScanMode(bool radioDiscoverable) {
StopAdvertising();
radio_discoverable_ = radioDiscoverable;
StartAdvertising();
}
private:
void InitializeServiceSdpAttributes(RfcommServiceProvider rfcommProvider,
std::string service_name);
Exception StartAdvertising();
void StopAdvertising();
// This is used to store sockets in case Accept hasn't been called. Once
// Accept has been called the socket is popped from the queue and returned to
// the caller
std::queue<std::unique_ptr<BluetoothSocket>> bluetooth_sockets_;
StreamSocketListener stream_socket_listener_;
winrt::event_token listener_token_;
CRITICAL_SECTION critical_section_;
bool closed_ = false;
bool radio_discoverable_;
const std::string service_name_;
const std::string service_uuid_;
RfcommServiceProvider rfcomm_provider_;
};
} // namespace windows
} // namespace nearby
} // namespace location
#endif // PLATFORM_IMPL_WINDOWS_BLUETOOTH_CLASSIC_SERVER_SOCKET_H_