Add bluetooth host and controller delegates for pairing.

components/pairing/bluetooth_controller_pairing_controller.cc

+// Copyright 2014 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 "components/pairing/bluetooth_controller_pairing_controller.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/pairing/bluetooth_pairing_constants.h"
+#include "components/pairing/pairing_api.pb.h"
+#include "device/bluetooth/bluetooth_adapter_factory.h"
+#include "device/bluetooth/bluetooth_discovery_session.h"
+#include "net/base/io_buffer.h"
+
+namespace {
+const char* kFakeEnrollmentDomain = "http://fake.com";
+const int kReceiveSize = 16384;
+}
+
+namespace pairing_chromeos {
+
+BluetoothControllerPairingController::BluetoothControllerPairingController()
+    : current_stage_(STAGE_NONE),
+      got_initial_status_(false),
+      proto_decoder_(new ProtoDecoder(this)),
+      ptr_factory_(this) {
+}
+
+BluetoothControllerPairingController::~BluetoothControllerPairingController() {
+  Reset();
+}
+
+void BluetoothControllerPairingController::ChangeStage(Stage new_stage) {
+  if (current_stage_ == new_stage)
+    return;
+  current_stage_ = new_stage;
+  FOR_EACH_OBSERVER(ControllerPairingController::Observer, observers_,
+                    PairingStageChanged(new_stage));
+}
+
+void BluetoothControllerPairingController::Reset() {
+  got_initial_status_ = false;
+  controller_device_id_ = "";

[achuithb, 2014/08/21 07:08:58]

nit: I prefer clear() to this assignment.

[Zachary Kuznia, 2014/08/26 19:29:44]

Done.

+  discovery_session_.reset();
+
+  if (socket_) {
+    socket_->Close();
+    socket_ = NULL;
+  }
+
+  if (adapter_) {
+    adapter_->RemoveObserver(this);
+    adapter_ = NULL;
+  }
+}
+
+void BluetoothControllerPairingController::DeviceFound(
+    device::BluetoothDevice* device) {
+  DCHECK_EQ(current_stage_, STAGE_DEVICES_DISCOVERY);
+  DCHECK(thread_checker_.CalledOnValidThread());
+  if (StartsWith(device->GetName(), base::ASCIIToUTF16(kDeviceNamePrefix),
+                 false)) {
+    discovered_devices_.insert(device->GetAddress());
+    FOR_EACH_OBSERVER(ControllerPairingController::Observer, observers_,
+                      DiscoveredDevicesListChanged());
+  }
+}
+
+void BluetoothControllerPairingController::DeviceLost(
+    device::BluetoothDevice* device) {
+  DCHECK_EQ(current_stage_, STAGE_DEVICES_DISCOVERY);
+  DCHECK(thread_checker_.CalledOnValidThread());
+  std::set<std::string>::iterator ix =
+      discovered_devices_.find(device->GetAddress());
+  if (ix != discovered_devices_.end()) {
+    discovered_devices_.erase(ix);
+    FOR_EACH_OBSERVER(ControllerPairingController::Observer, observers_,
+                      DiscoveredDevicesListChanged());
+  }
+}
+
+void BluetoothControllerPairingController::OnSetPowered() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  adapter_->StartDiscoverySession(
+      base::Bind(&BluetoothControllerPairingController::OnStartDiscoverySession,
+                 ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothControllerPairingController::OnError,
+                 ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothControllerPairingController::OnGetAdapter(
+    scoped_refptr<device::BluetoothAdapter> adapter) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(!adapter_);
+  adapter_ = adapter;
+  adapter_->AddObserver(this);
+
+  if (adapter_->IsPowered()) {
+    OnSetPowered();
+  } else {
+    adapter_->SetPowered(
+        true,
+        base::Bind(&BluetoothControllerPairingController::OnSetPowered,
+                   ptr_factory_.GetWeakPtr()),
+        base::Bind(&BluetoothControllerPairingController::OnError,
+                   ptr_factory_.GetWeakPtr()));
+  }
+}
+
+void BluetoothControllerPairingController::OnStartDiscoverySession(
+    scoped_ptr<device::BluetoothDiscoverySession> discovery_session) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  discovery_session_ = discovery_session.Pass();
+  ChangeStage(STAGE_DEVICES_DISCOVERY);
+
+  device::BluetoothAdapter::DeviceList device_list = adapter_->GetDevices();
+  for (device::BluetoothAdapter::DeviceList::iterator ix = device_list.begin();
+       ix != device_list.end(); ++ix) {
+    DeviceFound(*ix);
+  }
+}
+
+void BluetoothControllerPairingController::OnConnect() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  device::BluetoothDevice* device = adapter_->GetDevice(controller_device_id_);

[achuithb, 2014/08/21 07:08:58]

You're using this pattern often enough that you should probably write a helper
function to do this, like
device::BluetoothDevice* BluetoothControllerPairingController::GetDevice() {
device::BluetoothDevice* device = adapter_->GetDevice(controller_device_id_);
  if (!device)
    ChangeStage(STAGE_ESTABLISHING_CONNECTION_ERROR);
  return device;
}
And the calling sites can do a NULL check

[Zachary Kuznia, 2014/08/26 19:29:44]

Done.

+  if (!device) {
+    ChangeStage(STAGE_ESTABLISHING_CONNECTION_ERROR);

[achuithb, 2014/08/21 07:08:58]

Should this log an error?

[Zachary Kuznia, 2014/08/26 19:29:44]

Put the LOG in the shared function.

+    return;
+  }
+
+  device->ConnectToService(
+      device::BluetoothUUID(kPairingServiceUUID),
+      base::Bind(&BluetoothControllerPairingController::OnConnectToService,
+                 ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothControllerPairingController::OnErrorWithMessage,
+                 ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothControllerPairingController::OnConnectToService(
+    scoped_refptr<device::BluetoothSocket> socket) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  socket_ = socket;
+
+  socket_->Receive(
+      kReceiveSize,
+      base::Bind(&BluetoothControllerPairingController::OnReceiveComplete,
+                 ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothControllerPairingController::OnReceiveError,
+                 ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothControllerPairingController::OnSendComplete(int bytes_sent) {}
+
+void BluetoothControllerPairingController::OnReceiveComplete(
+    int bytes, scoped_refptr<net::IOBuffer> io_buffer) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  proto_decoder_->DecodeIOBuffer(bytes, io_buffer);
+
+  socket_->Receive(
+      kReceiveSize,
+      base::Bind(&BluetoothControllerPairingController::OnReceiveComplete,
+                 ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothControllerPairingController::OnReceiveError,
+                 ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothControllerPairingController::OnError() {
+  // TODO(zork): Add a stage for initialization error. (http://crbug.com/405744)
+  LOG(ERROR) << "Pairing initialization failed";
+  Reset();
+}
+
+void BluetoothControllerPairingController::OnErrorWithMessage(
+    const std::string& message) {
+  // TODO(zork): Add a stage for initialization error. (http://crbug.com/405744)
+  LOG(ERROR) << message;
+  Reset();
+}
+
+void BluetoothControllerPairingController::OnConnectError(
+    device::BluetoothDevice::ConnectErrorCode error_code) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  device::BluetoothDevice* device = adapter_->GetDevice(controller_device_id_);
+  if (device && device->IsPaired()) {
+    // The connection attempt is only used to start the pairing between the
+    // devices.  If the connection fails, it's not a problem as long as pairing
+    // was successful.
+    OnConnect();
+  } else {
+    ChangeStage(STAGE_ESTABLISHING_CONNECTION_ERROR);
+  }
+}
+
+void BluetoothControllerPairingController::OnReceiveError(
+    device::BluetoothSocket::ErrorReason reason,
+    const std::string& error_message) {
+  LOG(ERROR) << reason << ", " << error_message;
+  Reset();
+}
+
+void BluetoothControllerPairingController::AddObserver(
+    ControllerPairingController::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void BluetoothControllerPairingController::RemoveObserver(
+    ControllerPairingController::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+ControllerPairingController::Stage
+BluetoothControllerPairingController::GetCurrentStage() {
+  return current_stage_;
+}
+
+void BluetoothControllerPairingController::StartPairing() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(current_stage_ == STAGE_NONE ||
+         current_stage_ == STAGE_DEVICE_NOT_FOUND ||
+         current_stage_ == STAGE_ESTABLISHING_CONNECTION_ERROR ||
+         current_stage_ == STAGE_HOST_ENROLLMENT_ERROR);
+  // TODO(zork): Add a stage for no bluetooth. (http://crbug.com/405744)
+  if (!device::BluetoothAdapterFactory::IsBluetoothAdapterAvailable()) {
+    ChangeStage(STAGE_DEVICE_NOT_FOUND);
+    return;
+  }
+
+  device::BluetoothAdapterFactory::GetAdapter(
+      base::Bind(&BluetoothControllerPairingController::OnGetAdapter,
+                 ptr_factory_.GetWeakPtr()));
+
+}
+
+ControllerPairingController::DeviceIdList
+BluetoothControllerPairingController::GetDiscoveredDevices() {
+  DCHECK_EQ(current_stage_, STAGE_DEVICES_DISCOVERY);
+  return DeviceIdList(discovered_devices_.begin(), discovered_devices_.end());
+}
+
+void BluetoothControllerPairingController::ChooseDeviceForPairing(
+    const std::string& device_id) {
+  DCHECK_EQ(current_stage_, STAGE_DEVICES_DISCOVERY);
+  DCHECK(discovered_devices_.count(device_id));
+  discovery_session_.reset();
+  controller_device_id_ = device_id;
+
+  device::BluetoothDevice* device = adapter_->GetDevice(controller_device_id_);
+
+  if (device) {
+    ChangeStage(STAGE_ESTABLISHING_CONNECTION);
+    if (device->IsPaired()) {
+      OnConnect();
+    } else {
+      device->Connect(
+          this,
+          base::Bind(&BluetoothControllerPairingController::OnConnect,
+                     ptr_factory_.GetWeakPtr()),
+          base::Bind(&BluetoothControllerPairingController::OnConnectError,
+                     ptr_factory_.GetWeakPtr()));
+    }
+  } else {
+    ChangeStage(STAGE_ESTABLISHING_CONNECTION_ERROR);
+  }
+}
+
+void BluetoothControllerPairingController::RepeatDiscovery() {
+  DCHECK(current_stage_ == STAGE_DEVICE_NOT_FOUND ||
+         current_stage_ == STAGE_ESTABLISHING_CONNECTION_ERROR ||
+         current_stage_ == STAGE_HOST_ENROLLMENT_ERROR);
+  Reset();
+  StartPairing();
+}
+
+std::string BluetoothControllerPairingController::GetConfirmationCode() {
+  DCHECK_EQ(current_stage_, STAGE_WAITING_FOR_CODE_CONFIRMATION);
+  DCHECK(!confirmation_code_.empty());
+  return confirmation_code_;
+}
+
+void BluetoothControllerPairingController::SetConfirmationCodeIsCorrect(
+    bool correct) {
+  DCHECK_EQ(current_stage_, STAGE_WAITING_FOR_CODE_CONFIRMATION);
+
+  device::BluetoothDevice* device = adapter_->GetDevice(controller_device_id_);
+  if (!device) {
+    ChangeStage(STAGE_ESTABLISHING_CONNECTION_ERROR);
+    return;
+  }
+
+  if (correct) {
+    device->ConfirmPairing();
+    // Once pairing is confirmed, the connection will either be successful, or
+    // fail.  Either case is acceptable as long as the devices are paired.
+  } else {
+    device->RejectPairing();
+    controller_device_id_ = "";

[achuithb, 2014/08/21 07:08:58]

nit: clear()

[Zachary Kuznia, 2014/08/26 19:29:44]

Done.

+    RepeatDiscovery();
+  }
+}
+
+void BluetoothControllerPairingController::OnAuthenticationDone(
+    const chromeos::UserContext& user_context,
+    content::BrowserContext* browser_context) {
+  DCHECK_EQ(current_stage_, STAGE_WAITING_FOR_CREDENTIALS);
+
+  // TODO(zork): Get configuration from UI and send to Host.
+  // (http://crbug.com/405744)
+
+  // TODO(zork): Get proper credentials. (http://crbug.com/405744)
+  // For now, send a fake domain.
+  pairing_api::PairDevices pair_devices;
+  pair_devices.set_api_version(kPairingAPIVersion);
+  pair_devices.mutable_parameters()->set_admin_access_token(
+      kFakeEnrollmentDomain);
+
+  int size = 0;
+  scoped_refptr<net::IOBuffer> io_buffer(
+      ProtoDecoder::SendPairDevices(pair_devices, &size));
+
+  socket_->Send(
+      io_buffer, size,
+      base::Bind(&BluetoothControllerPairingController::OnSendComplete,
+                 ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothControllerPairingController::OnErrorWithMessage,
+                 ptr_factory_.GetWeakPtr()));
+  ChangeStage(STAGE_HOST_ENROLLMENT_IN_PROGRESS);
+}
+
+void BluetoothControllerPairingController::StartSession() {
+  DCHECK_EQ(current_stage_, STAGE_PAIRING_DONE);
+  ChangeStage(STAGE_FINISHED);
+}
+
+// ProtoDecoder::Observer:
+void BluetoothControllerPairingController::OnHostStatusMessage(
+    const pairing_api::HostStatus& message) {
+  if (got_initial_status_) {
+    if (message.parameters().has_domain()) {
+      // TODO(zork): Remove this if we don't actually need the domain for UI.
+      // (http://crbug.com/405761)
+      if (message.parameters().domain() == kFakeEnrollmentDomain) {
+        pairing_api::CompleteSetup complete_setup;
+        complete_setup.set_api_version(kPairingAPIVersion);
+        // TODO(zork): Get AddAnother from UI (http://crbug.com/405757)
+        complete_setup.mutable_parameters()->set_add_another(false);
+
+        int size = 0;
+        scoped_refptr<net::IOBuffer> io_buffer(
+            ProtoDecoder::SendCompleteSetup(complete_setup, &size));
+
+        socket_->Send(
+            io_buffer, size,
+            base::Bind(&BluetoothControllerPairingController::OnSendComplete,
+                       ptr_factory_.GetWeakPtr()),
+            base::Bind(
+                &BluetoothControllerPairingController::OnErrorWithMessage,
+                ptr_factory_.GetWeakPtr()));
+        ChangeStage(STAGE_PAIRING_DONE);
+      } else {
+        ChangeStage(STAGE_HOST_ENROLLMENT_ERROR);
+      }
+    } else {
+      ChangeStage(STAGE_HOST_ENROLLMENT_ERROR);
+    }
+  } else {
+    got_initial_status_ = true;
+
+    // TODO(zork): Check domain. (http://crbug.com/405761)
+
+    // TODO(zork): Handling updating stages (http://crbug.com/405754).
+    ChangeStage(STAGE_WAITING_FOR_CREDENTIALS);
+  }
+}
+
+void BluetoothControllerPairingController::OnConfigureHostMessage(
+    const pairing_api::ConfigureHost& message) {
+  NOTREACHED();
+}
+
+void BluetoothControllerPairingController::OnPairDevicesMessage(
+    const pairing_api::PairDevices& message) {
+  NOTREACHED();
+}
+
+void BluetoothControllerPairingController::OnCompleteSetupMessage(
+    const pairing_api::CompleteSetup& message) {
+  NOTREACHED();
+}
+
+void BluetoothControllerPairingController::OnErrorMessage(
+    const pairing_api::Error& message) {
+  LOG(ERROR) << message.parameters().code() << ", " <<
+      message.parameters().description();
+  ChangeStage(STAGE_HOST_ENROLLMENT_ERROR);
+}
+
+void BluetoothControllerPairingController::DeviceAdded(
+    device::BluetoothAdapter* adapter,
+    device::BluetoothDevice* device) {
+  DCHECK_EQ(adapter, adapter_.get());
+  DeviceFound(device);
+}
+
+void BluetoothControllerPairingController::DeviceRemoved(
+    device::BluetoothAdapter* adapter,
+    device::BluetoothDevice* device) {
+  DCHECK_EQ(adapter, adapter_.get());
+  DeviceLost(device);
+}
+
+void BluetoothControllerPairingController::RequestPinCode(
+    device::BluetoothDevice* device) {
+  // Disallow unknown device.
+  device->RejectPairing();
+}
+
+void BluetoothControllerPairingController::RequestPasskey(
+    device::BluetoothDevice* device) {
+  // Disallow unknown device.
+  device->RejectPairing();
+}
+
+void BluetoothControllerPairingController::DisplayPinCode(
+    device::BluetoothDevice* device,
+    const std::string& pincode) {
+  // Disallow unknown device.
+  device->RejectPairing();
+}
+
+void BluetoothControllerPairingController::DisplayPasskey(
+    device::BluetoothDevice* device,
+    uint32 passkey) {
+  // Disallow unknown device.
+  device->RejectPairing();
+}
+
+void BluetoothControllerPairingController::KeysEntered(
+    device::BluetoothDevice* device,
+    uint32 entered) {
+  // Disallow unknown device.
+  device->RejectPairing();
+}
+
+void BluetoothControllerPairingController::ConfirmPasskey(
+    device::BluetoothDevice* device,
+    uint32 passkey) {
+  confirmation_code_ = base::StringPrintf("%06d", passkey);
+  ChangeStage(STAGE_WAITING_FOR_CODE_CONFIRMATION);
+}
+
+void BluetoothControllerPairingController::AuthorizePairing(
+    device::BluetoothDevice* device) {
+  // Disallow unknown device.
+  device->RejectPairing();
+}
+
+}  // namespace pairing_chromeos