Add Device Policy Handler for Bluetooth, and allow disabling the Bluetooth adapter on Chrome OS

chrome/browser/chromeos/policy/bluetooth_policy_handler.cc

+// Copyright (c) 2016 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 "chrome/browser/chromeos/policy/bluetooth_policy_handler.h"
+
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "chromeos/settings/cros_settings_names.h"
+#include "chromeos/settings/cros_settings_provider.h"
+#include "device/bluetooth/bluetooth_adapter.h"
+#include "device/bluetooth/bluetooth_adapter_factory.h"
+
+namespace policy {
+
+namespace {
+
+void SetBluetoothPolicy(bool allow_bluetooth,
+                        scoped_refptr<device::BluetoothAdapter> adapter) {
+  if (!allow_bluetooth)
+    adapter->Shutdown();

[scheib, 2016/04/18 17:10:57]

If all references to the adapter are released then a new adapter can be
constructed and it will be available. You must hold a reference to the adapter
to keep it shut down.

[Ivan Šandrk, 2016/04/19 15:53:58]

Done.

+}
+
+}  // namespace
+
+BluetoothPolicyHandler::BluetoothPolicyHandler(
+    chromeos::CrosSettings* cros_settings)
+    : cros_settings_(cros_settings), weak_factory_(this) {
+  bluetooth_policy_subscription_ = cros_settings_->AddSettingsObserver(
+      chromeos::kAllowBluetooth,
+      base::Bind(&BluetoothPolicyHandler::OnBluetoothPolicyChanged,
+                 weak_factory_.GetWeakPtr()));
+
+  // Fire it once so we're sure we get an invocation on startup.
+  OnBluetoothPolicyChanged();
+}
+
+BluetoothPolicyHandler::~BluetoothPolicyHandler() {}
+
+void BluetoothPolicyHandler::OnBluetoothPolicyChanged() {
+  chromeos::CrosSettingsProvider::TrustedStatus status =
+      cros_settings_->PrepareTrustedValues(
+          base::Bind(&BluetoothPolicyHandler::OnBluetoothPolicyChanged,
+                     weak_factory_.GetWeakPtr()));
+  if (status != chromeos::CrosSettingsProvider::TRUSTED)
+    return;
+
+  // Get the updated policy.
+  bool allow_bluetooth = true;
+  cros_settings_->GetBoolean(chromeos::kAllowBluetooth, &allow_bluetooth);
+
+  device::BluetoothAdapterFactory::GetAdapter(
+      base::Bind(&SetBluetoothPolicy, allow_bluetooth));
+}
+
+}  // namespace policy