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// Copyright 2017 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_remote_gatt_descriptor_mac.h"
#import "base/apple/foundation_util.h"
#include "base/functional/bind.h"
#include "base/notimplemented.h"
#include "base/strings/sys_string_conversions.h"
#import "base/task/single_thread_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "device/bluetooth/bluetooth_low_energy_adapter_apple.h"
#import "device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h"
using base::apple::ObjCCast;
namespace device {
std::vector<uint8_t> VectorValueFromObjC(id objc_value) {
// According to
// https://developer.apple.com/reference/corebluetooth/cbdescriptor some
// descriptor values can be NSData, NSString or NSNumber.
std::vector<uint8_t> value;
NSData* data = ObjCCast<NSData>(objc_value);
NSString* as_string = ObjCCast<NSString>(objc_value);
NSNumber* as_number = ObjCCast<NSNumber>(objc_value);
if (!data && !as_string && as_number) {
unsigned short descriptor = [as_number shortValue];
data = [NSData dataWithBytes:&descriptor length:sizeof(descriptor)];
}
if (!data && as_string)
data = [as_string dataUsingEncoding:NSUTF8StringEncoding];
if (data) {
value.resize([data length]);
[data getBytes:value.data() length:value.size()];
} else {
LOG(WARNING) << "Unexpected value: "
<< base::SysNSStringToUTF8([objc_value description]);
}
return value;
}
BluetoothRemoteGattDescriptorMac::BluetoothRemoteGattDescriptorMac(
BluetoothRemoteGattCharacteristicMac* characteristic,
CBDescriptor* descriptor)
: gatt_characteristic_(characteristic), cb_descriptor_(descriptor) {
uuid_ = BluetoothLowEnergyAdapterApple::BluetoothUUIDWithCBUUID(
[cb_descriptor_ UUID]);
identifier_ = base::SysNSStringToUTF8(
[NSString stringWithFormat:@"%s-%p", uuid_.canonical_value().c_str(),
cb_descriptor_]);
}
std::string BluetoothRemoteGattDescriptorMac::GetIdentifier() const {
return identifier_;
}
BluetoothUUID BluetoothRemoteGattDescriptorMac::GetUUID() const {
return uuid_;
}
BluetoothGattCharacteristic::Permissions
BluetoothRemoteGattDescriptorMac::GetPermissions() const {
NOTIMPLEMENTED();
return BluetoothGattCharacteristic::PERMISSION_NONE;
}
const std::vector<uint8_t>& BluetoothRemoteGattDescriptorMac::GetValue() const {
return value_;
}
BluetoothRemoteGattDescriptorMac::~BluetoothRemoteGattDescriptorMac() {
destructor_called_ = true;
if (HasPendingRead()) {
std::move(read_value_callback_)
.Run(BluetoothGattService::GattErrorCode::kFailed,
/*value=*/std::vector<uint8_t>());
}
if (HasPendingWrite()) {
std::move(write_value_callbacks_)
.second.Run(BluetoothGattService::GattErrorCode::kFailed);
}
}
BluetoothRemoteGattCharacteristic*
BluetoothRemoteGattDescriptorMac::GetCharacteristic() const {
return static_cast<BluetoothRemoteGattCharacteristic*>(gatt_characteristic_);
}
// Sends a read request to a remote characteristic descriptor to read its
// value. |callback| is called to return the read value on success and
// |error_callback| is called for failures.
void BluetoothRemoteGattDescriptorMac::ReadRemoteDescriptor(
ValueCallback callback) {
if (destructor_called_ || HasPendingRead() || HasPendingWrite()) {
DVLOG(1) << *this << ": Read failed, already in progress.";
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(std::move(callback),
BluetoothGattService::GattErrorCode::kInProgress,
/*value=*/std::vector<uint8_t>()));
return;
}
DVLOG(1) << *this << ": Read value.";
read_value_callback_ = std::move(callback);
[GetCBPeripheral() readValueForDescriptor:cb_descriptor_];
}
void BluetoothRemoteGattDescriptorMac::WriteRemoteDescriptor(
base::span<const uint8_t> value,
base::OnceClosure callback,
ErrorCallback error_callback) {
if (destructor_called_ || HasPendingRead() || HasPendingWrite()) {
DVLOG(1) << *this << ": Write failed, already in progress.";
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(std::move(error_callback),
BluetoothGattService::GattErrorCode::kInProgress));
return;
}
DVLOG(1) << *this << ": Write value.";
write_value_callbacks_ =
std::make_pair(std::move(callback), std::move(error_callback));
NSData* nsdata_value = [[NSData alloc] initWithBytes:value.data()
length:value.size()];
[GetCBPeripheral() writeValue:nsdata_value forDescriptor:GetCBDescriptor()];
}
void BluetoothRemoteGattDescriptorMac::DidUpdateValueForDescriptor(
NSError* error) {
if (!HasPendingRead()) {
DVLOG(1) << *this << ": Value updated, no read in progress.";
return;
}
if (error) {
BluetoothGattService::GattErrorCode error_code =
BluetoothDeviceMac::GetGattErrorCodeFromNSError(error);
DVLOG(1) << *this << ": Read value failed with error: "
<< BluetoothLowEnergyAdapterApple::String(error)
<< ", converted to error code: " << static_cast<int>(error_code);
std::move(read_value_callback_)
.Run(error_code,
/*value=*/std::vector<uint8_t>());
return;
}
DVLOG(1) << *this << ": Value read.";
value_ = VectorValueFromObjC([cb_descriptor_ value]);
std::move(read_value_callback_).Run(/*error_code=*/std::nullopt, value_);
}
void BluetoothRemoteGattDescriptorMac::DidWriteValueForDescriptor(
NSError* error) {
if (!HasPendingWrite()) {
DVLOG(1) << *this << ": Value written, no write in progress.";
return;
}
std::pair<base::OnceClosure, ErrorCallback> callbacks;
callbacks.swap(write_value_callbacks_);
if (error) {
BluetoothGattService::GattErrorCode error_code =
BluetoothDeviceMac::GetGattErrorCodeFromNSError(error);
DVLOG(1) << *this << ": Write value failed with error: "
<< BluetoothLowEnergyAdapterApple::String(error)
<< ", converted to error code: " << static_cast<int>(error_code);
std::move(callbacks.second).Run(error_code);
return;
}
DVLOG(1) << *this << ": Value written.";
std::move(callbacks.first).Run();
}
CBPeripheral* BluetoothRemoteGattDescriptorMac::GetCBPeripheral() const {
return gatt_characteristic_->GetCBPeripheral();
}
CBDescriptor* BluetoothRemoteGattDescriptorMac::GetCBDescriptor() const {
return cb_descriptor_;
}
DEVICE_BLUETOOTH_EXPORT std::ostream& operator<<(
std::ostream& out,
const BluetoothRemoteGattDescriptorMac& descriptor) {
const BluetoothRemoteGattCharacteristicMac* characteristic_mac =
static_cast<const BluetoothRemoteGattCharacteristicMac*>(
descriptor.GetCharacteristic());
return out << "<BluetoothRemoteGattDescriptorMac "
<< descriptor.GetUUID().canonical_value() << "/" << &descriptor
<< ", characteristic: "
<< characteristic_mac->GetUUID().canonical_value() << "/"
<< characteristic_mac << ">";
}
} // namespace device.
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