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()
+    : ptr_factory_(this),
+      current_stage_(STAGE_NONE),
+      got_initial_status_(false),
+      device_(NULL),
+      proto_decoder_(new ProtoDecoder(this)) {
+}

[achuithb, 2014/08/20 21:52:32]

Is this expected to be created and used on the UI Thread? Maybe we should add
DCHECKs, especially for the ctor/dtor and callbacks.

[Zachary Kuznia, 2014/08/21 00:42:07]

Done.

+
+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;
+  device_ = NULL;
+  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);
+  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);
+  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() {
+  adapter_->StartDiscoverySession(
+      base::Bind(&BluetoothControllerPairingController::OnStartDiscoverySession,
+                 ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothControllerPairingController::OnError,
+                 ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothControllerPairingController::OnGetAdapter(
+    scoped_refptr<device::BluetoothAdapter> adapter) {
+  CHECK(!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) {
+  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() {
+  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) {
+  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) {
+  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() {
+  ChangeStage(STAGE_DEVICE_NOT_FOUND);

[achuithb, 2014/08/20 21:52:32]

Shouldn't we be logging something here? Why STAGE_DEVICE_NOT_FOUND?

[Zachary Kuznia, 2014/08/21 00:42:07]

Added TODO and explanation.

+}
+
+void BluetoothControllerPairingController::OnErrorWithMessage(
+    const std::string& message) {
+  LOG(ERROR) << message;
+  Reset();

[achuithb, 2014/08/20 21:52:31]

Is this the best thing to do? What happens if we reset? Does the system recover?
Should we be retrying instead?

[Zachary Kuznia, 2014/08/21 00:42:06]

Added TODO and explanation.

+}
+
+void BluetoothControllerPairingController::OnConnectError(
+    device::BluetoothDevice::ConnectErrorCode error_code) {
+  if (device_->IsPaired()) {

[achuithb, 2014/08/20 21:52:32]

Could you add some comments here - why is connect error normal?

[Zachary Kuznia, 2014/08/21 00:42:06]

Added comment.

+    // Connection error is fine, 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();
+}
+
+// ControllerPairingController:

[achuithb, 2014/08/20 21:52:32]

Remove this comment

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+void BluetoothControllerPairingController::AddObserver(
+    ControllerPairingController::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void BluetoothControllerPairingController::RemoveObserver(
+    ControllerPairingController::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+ControllerPairingController::Stage
+BluetoothControllerPairingController::GetCurrentStage() {

[achuithb, 2014/08/20 21:52:31]

This should be current_stage() and defined in the header

[Zachary Kuznia, 2014/08/21 00:42:06]

This is virtual, as discussed.

+  return current_stage_;
+}
+
+void BluetoothControllerPairingController::StartPairing() {
+  DCHECK(current_stage_ == STAGE_NONE ||
+         current_stage_ == STAGE_DEVICE_NOT_FOUND ||
+         current_stage_ == STAGE_ESTABLISHING_CONNECTION_ERROR ||
+         current_stage_ == STAGE_HOST_ENROLLMENT_ERROR);
+  bool bluetooth_available =

[achuithb, 2014/08/20 21:52:32]

This variable seems unnecessary - why not inline it.

If you want to keep it, it should be const.

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+      device::BluetoothAdapterFactory::IsBluetoothAdapterAvailable();
+  // TODO(zork): Add a stage for no bluetooth.

[achuithb, 2014/08/20 21:52:32]

Let's add bug-ids for all TODOs.

[Zachary Kuznia, 2014/08/21 00:42:07]

Done.

+  if (!bluetooth_available)
+    ChangeStage(STAGE_DEVICE_NOT_FOUND);
+
+  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);
+  CHECK(discovered_devices_.count(device_id));

[achuithb, 2014/08/20 21:52:31]

Why CHECK?

[Zachary Kuznia, 2014/08/21 00:42:06]

DCHECK now.

+  // TODO: Consider using stop instead of reset().

[achuithb, 2014/08/20 21:52:33]

TODO(zork) + bug-id

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+  discovery_session_.reset();
+  device_ = adapter_->GetDevice(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() {
+  CHECK(current_stage_ == STAGE_DEVICE_NOT_FOUND ||

[achuithb, 2014/08/20 21:52:33]

Why CHECK and not DCHECK?

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+        current_stage_ == STAGE_ESTABLISHING_CONNECTION_ERROR ||
+        current_stage_ == STAGE_HOST_ENROLLMENT_ERROR);
+  Reset();
+  StartPairing();
+}
+
+std::string BluetoothControllerPairingController::GetConfirmationCode() {

[achuithb, 2014/08/20 21:52:32]

Return const std::string&

[Zachary Kuznia, 2014/08/21 00:42:07]

This is virtual, as discussed.

+  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);
+  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();
+    device_ = NULL;
+    RepeatDiscovery();
+  }
+}
+
+void BluetoothControllerPairingController::OnAuthenticationDone(
+    const chromeos::UserContext& user_context,
+    content::BrowserContext* browser_context) {
+  DCHECK_EQ(current_stage_, STAGE_WAITING_FOR_CREDENTIALS);
+
+  // TODO: Get configuration from UI and send to Host
+
+  // TODO: Get proper credentials.

[achuithb, 2014/08/20 21:52:33]

TODO(zork) + bug-id

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+  // 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:

[achuithb, 2014/08/20 21:52:32]

Remove this comment

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+void BluetoothControllerPairingController::OnHostStatusMessage(
+    const pairing_api::HostStatus& message) {
+  if (got_initial_status_) {
+    if (message.parameters().has_domain()) {
+      if (message.parameters().domain() == kFakeEnrollmentDomain) {

[achuithb, 2014/08/20 21:52:31]

Where is this domain supposed to come from?

[Zachary Kuznia, 2014/08/21 00:42:06]

Added a comment to explain.

+        pairing_api::CompleteSetup complete_setup;
+        complete_setup.set_api_version(kPairingAPIVersion);
+        // TODO: Get AddAnother from UI

[achuithb, 2014/08/20 21:52:32]

TODO(zork) + bug-id

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+        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,

[achuithb, 2014/08/20 21:52:31]

Should we be retrying?

[Zachary Kuznia, 2014/08/21 00:42:06]

No; if send fails, we'll have to restart the whole communication process, and
it's safest to restart the pairing.

+                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: Check domain.
+
+    // TODO: Handling updating stages.

[achuithb, 2014/08/20 21:52:32]

TODO(zork) + bug-id

[Zachary Kuznia, 2014/08/21 00:42:07]

Done.

+    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);
+}
+
+// device::BluetoothAdapter::Observer:

[achuithb, 2014/08/20 21:52:32]

REmove this comment

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+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);
+}
+
+// device::BluetoothDevice::PairingDelegate:

[achuithb, 2014/08/20 21:52:32]

REmove this comment

[Zachary Kuznia, 2014/08/21 00:42:06]

Done.

+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) {
+  DCHECK_EQ(device, device_);
+  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