mojo api for view based lockscreen

chrome/browser/ui/ash/lock_screen_client_chromeos.cc

+// Copyright 2017 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/ui/ash/lock_screen_client_chromeos.h"
+
+#include "ash/public/interfaces/constants.mojom.h"
+#include "chrome/browser/chromeos/login/lock/screen_locker.h"
+#include "content/public/common/service_manager_connection.h"
+#include "services/service_manager/public/cpp/connector.h"
+
+namespace {
+LockScreenClientChromeOS* g_instance = nullptr;
+}  // namespace
+
+LockScreenClientChromeOS::LockScreenClientChromeOS() : binding_(this) {
+  content::ServiceManagerConnection::GetForProcess()
+      ->GetConnector()
+      ->BindInterface(ash::mojom::kServiceName, &lock_screen_);
+  // Register this object as the client interface implementation.
+  lock_screen_->SetClient(binding_.CreateInterfacePtrAndBind());
+
+  DCHECK(!g_instance);
+  g_instance = this;
+}
+
+LockScreenClientChromeOS::~LockScreenClientChromeOS() {
+  DCHECK_EQ(this, g_instance);
+  g_instance = nullptr;
+}
+
+// static
+LockScreenClientChromeOS* LockScreenClientChromeOS::Get() {
+  return g_instance;
+}
+
+void LockScreenClientChromeOS::AuthenticateUser(
+    const AccountId& account_id,
+    const std::string& hashed_password,
+    bool authenticated_by_pin) {
+  // TODO(xiaoyinh@): Complete the implementation below.

[James Cook, 2017/05/15 21:15:01]

super-nit: No "@" in todos. :-)

[xiaoyinh(OOO Sep 11-29), 2017/05/16 17:32:50]

Done.

+  // It should be similar as SigninScreenHandler::HandleAuthenticateUser.
+  chromeos::UserContext user_context(account_id);
+  chromeos::Key key(chromeos::Key::KEY_TYPE_SALTED_SHA256_TOP_HALF,
+                    std::string(), hashed_password);
+  user_context.SetKey(key);
+  user_context.SetIsUsingPin(authenticated_by_pin);
+  chromeos::ScreenLocker::default_screen_locker()->Authenticate(user_context);
+}
+
+void LockScreenClientChromeOS::ShowErrorMessage() {
+  lock_screen_->ShowErrorMessage();
+}
+
+void LockScreenClientChromeOS::ClearErrors() {
+  lock_screen_->ClearErrors();
+}