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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "device/bluetooth/bluetooth_low_energy_device_watcher_mac.h"
#include <utility>
#include "base/apple/foundation_util.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/strings/sys_string_conversions.h"
#import "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
namespace device {
namespace {
constexpr char kBluetoothPlistFilePath[] =
"/Library/Preferences/com.apple.Bluetooth.plist";
} // namespace
// static
scoped_refptr<BluetoothLowEnergyDeviceWatcherMac>
BluetoothLowEnergyDeviceWatcherMac::CreateAndStartWatching(
scoped_refptr<base::SequencedTaskRunner> ui_thread_task_runner,
LowEnergyDeviceListUpdatedCallback
low_energy_device_list_updated_callback) {
auto watcher = base::MakeRefCounted<BluetoothLowEnergyDeviceWatcherMac>(
std::move(ui_thread_task_runner),
std::move(low_energy_device_list_updated_callback));
watcher->Init();
return watcher;
}
BluetoothLowEnergyDeviceWatcherMac::BluetoothLowEnergyDeviceWatcherMac(
scoped_refptr<base::SequencedTaskRunner> ui_thread_task_runner,
LowEnergyDeviceListUpdatedCallback low_energy_device_list_updated_callback)
: ui_thread_task_runner_(std::move(ui_thread_task_runner)),
low_energy_device_list_updated_callback_(
std::move(low_energy_device_list_updated_callback)) {
DETACH_FROM_SEQUENCE(sequence_checker_);
}
BluetoothLowEnergyDeviceWatcherMac::~BluetoothLowEnergyDeviceWatcherMac() {
file_thread_task_runner_->DeleteSoon(FROM_HERE,
property_list_watcher_.release());
}
void BluetoothLowEnergyDeviceWatcherMac::OnPropertyListFileChangedOnFileThread(
const base::FilePath& path,
bool error) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (error) {
LOG(WARNING) << "Failed to read com.apple.Bluetooth.plist.";
return;
}
// Bluetooth property list file is expected to have the following format:
//
// "CoreBluetoothCache" => {
// "E7F8589A-A7D9-4B94-9A08-D89076A159F4" => {
// "DeviceAddress" => "11-11-11-11-11-11"
// "DeviceAddressType" => 1
// "ServiceChangedHandle" => 3
// "ServiceChangedSubscribed" => 0
// "ServiceDiscoveryComplete" => 0
// }
// "D3CAC59E-C501-4599-97DA-2DF491544EEE" => {
// "DeviceAddress" => "22-22-22-22-22-22"
// "DeviceAddressType" => 1
// "ServiceChangedHandle" => 3
// "ServiceChangedSubscribed" => 0
// "ServiceDiscoveryComplete" => 0
// }
// }
NSURL* plist_file = base::apple::FilePathToNSURL(path);
NSDictionary* bluetooth_info_dictionary =
[NSDictionary dictionaryWithContentsOfURL:plist_file error:nil];
// |bluetooth_info_dictionary| is nil if there was an error reading the file
// or if the content of the read file cannot be represented by a dictionary.
if (!bluetooth_info_dictionary)
return;
auto parsed_data =
ParseBluetoothDevicePropertyListData(bluetooth_info_dictionary);
ui_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(low_energy_device_list_updated_callback_,
std::move(parsed_data)));
}
void BluetoothLowEnergyDeviceWatcherMac::Init() {
file_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(&BluetoothLowEnergyDeviceWatcherMac::
AddBluetoothPropertyListFileWatcher,
this));
}
void BluetoothLowEnergyDeviceWatcherMac::ReadBluetoothPropertyListFile() {
file_thread_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&BluetoothLowEnergyDeviceWatcherMac::
OnPropertyListFileChangedOnFileThread,
this, BluetoothPlistFilePath(), false /* error */));
}
std::map<std::string, std::string>
BluetoothLowEnergyDeviceWatcherMac::ParseBluetoothDevicePropertyListData(
NSDictionary* data) {
std::map<std::string, std::string> updated_low_energy_devices_info;
NSDictionary* low_energy_devices_info = data[@"CoreBluetoothCache"];
if (!low_energy_devices_info)
return updated_low_energy_devices_info;
for (NSString* identifier in low_energy_devices_info) {
NSDictionary* device_info = low_energy_devices_info[identifier];
if (!device_info)
continue;
NSString* raw_device_address = device_info[@"DeviceAddress"];
if (!raw_device_address)
continue;
NSString* formatted_device_address =
[raw_device_address stringByReplacingOccurrencesOfString:@"-"
withString:@":"];
updated_low_energy_devices_info[base::SysNSStringToUTF8(identifier)] =
base::SysNSStringToUTF8(formatted_device_address);
}
return updated_low_energy_devices_info;
}
// static
const base::FilePath&
BluetoothLowEnergyDeviceWatcherMac::BluetoothPlistFilePath() {
static const base::FilePath file_path(kBluetoothPlistFilePath);
return file_path;
}
void BluetoothLowEnergyDeviceWatcherMac::AddBluetoothPropertyListFileWatcher() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
property_list_watcher_->Watch(
BluetoothPlistFilePath(), base::FilePathWatcher::Type::kNonRecursive,
base::BindRepeating(&BluetoothLowEnergyDeviceWatcherMac::
OnPropertyListFileChangedOnFileThread,
this));
}
} // namespace device
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