[CrOS Tether]: Add LocalDeviceDataProvider, which fetches device data for the local device.

chromeos/components/tether/local_device_data_provider.cc

Index: chromeos/components/tether/local_device_data_provider.cc
diff --git a/chromeos/components/tether/local_device_data_provider.cc b/chromeos/components/tether/local_device_data_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6bdc6c8c720c100b1d1c3df26623b740622aedde
--- /dev/null
+++ b/chromeos/components/tether/local_device_data_provider.cc
@@ -0,0 +1,87 @@
+// Copyright 2015 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 "chromeos/components/tether/local_device_data_provider.h"
+
+#include "components/cryptauth/cryptauth_device_manager.h"
+#include "components/cryptauth/cryptauth_enrollment_manager.h"
+#include "components/cryptauth/proto/cryptauth_api.pb.h"
+
+namespace chromeos {
+
+namespace tether {
+
+LocalDeviceDataProvider::LocalDeviceDataProvider(
+    const cryptauth::CryptAuthDeviceManager* cryptauth_device_manager,
+    const cryptauth::CryptAuthEnrollmentManager* cryptauth_enrollment_manager)
+    : LocalDeviceDataProvider(
+          base::MakeUnique<LocalDeviceDataProviderContextImpl>(
+              cryptauth_device_manager,
+              cryptauth_enrollment_manager)) {}
+
+LocalDeviceDataProvider::LocalDeviceDataProvider(
+    std::unique_ptr<LocalDeviceDataProviderContext> context)
+    : context_(std::move(context)) {}
+
+LocalDeviceDataProvider::~LocalDeviceDataProvider() {}
+
+LocalDeviceDataProvider::LocalDeviceDataProviderContextImpl::
+    LocalDeviceDataProviderContextImpl(
+        const cryptauth::CryptAuthDeviceManager* cryptauth_device_manager,
+        const cryptauth::CryptAuthEnrollmentManager*
+            cryptauth_enrollment_manager)
+    : cryptauth_device_manager_(cryptauth_device_manager),
+      cryptauth_enrollment_manager_(cryptauth_enrollment_manager) {}
+
+LocalDeviceDataProvider::LocalDeviceDataProviderContextImpl::
+    ~LocalDeviceDataProviderContextImpl() {}
+
+std::string
+LocalDeviceDataProvider::LocalDeviceDataProviderContextImpl::GetUserPublicKey()
+    const {
+  return cryptauth_enrollment_manager_->GetUserPublicKey();
+}
+
+std::vector<cryptauth::ExternalDeviceInfo>
+LocalDeviceDataProvider::LocalDeviceDataProviderContextImpl::GetSyncedDevices()
+    const {
+  return cryptauth_device_manager_->GetSyncedDevices();
+}
+
+bool LocalDeviceDataProvider::GetLocalDeviceData(
+    std::string* public_key_out,
+    std::vector<cryptauth::BeaconSeed>* beacon_seeds_out) const {
+  DCHECK(public_key_out || beacon_seeds_out);
+
+  std::string public_key = context_->GetUserPublicKey();
+  if (public_key.empty()) {
+    return false;
+  }
+
+  std::vector<cryptauth::ExternalDeviceInfo> synced_devices =
+      context_->GetSyncedDevices();
+  for (const auto& device : synced_devices) {
+    if (device.has_public_key() && device.public_key() == public_key &&
+        device.beacon_seeds_size() > 0) {
+      if (public_key_out) {
+        public_key_out->assign(public_key);
+      }
+
+      if (beacon_seeds_out) {
+        beacon_seeds_out->clear();
+        for (int i = 0; i < device.beacon_seeds_size(); i++) {
+          beacon_seeds_out->push_back(device.beacon_seeds(i));
+        }
+      }
+
+      return true;
+    }
+  }
+
+  return false;
+}
+
+}  // namespace tether
+
+}  // namespace cryptauth