ash: Add SessionController/Client mojo interfaces

ash/common/session/session_controller.cc

Index: ash/common/session/session_controller.cc
diff --git a/ash/common/session/session_controller.cc b/ash/common/session/session_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0a1c87583bef9af8872486cbe4313915e37e1a29
--- /dev/null
+++ b/ash/common/session/session_controller.cc
@@ -0,0 +1,176 @@
+// Copyright 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 "ash/common/session/session_controller.h"
+
+#include <algorithm>
+
+#include "ash/common/session/session_state_observer.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "components/signin/core/account_id/account_id.h"
+#include "services/service_manager/public/cpp/connector.h"
+
+namespace ash {
+
+SessionController::SessionController() {}
+
+SessionController::~SessionController() {}
+
+void SessionController::BindRequest(mojom::SessionControllerRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+int SessionController::GetMaximumNumberOfLoggedInUsers() const {
+  return static_cast<int>(max_users_);
+}
+
+int SessionController::NumberOfLoggedInUsers() const {
+  return static_cast<int>(user_sessions_.size());
+}
+
+AddUserSessionPolicy SessionController::GetAddUserPolicy() const {
+  return add_user_session_policy_;
+}
+
+bool SessionController::IsActiveUserSessionStarted() const {
+  return !user_sessions_.empty();
+}
+
+bool SessionController::CanLockScreen() const {
+  return can_lock_;
+}
+
+bool SessionController::IsScreenLocked() const {
+  return state_ == session_manager::SessionState::LOCKED;
+}
+
+bool SessionController::ShouldLockScreenAutomatically() const {
+  return should_lock_screen_automatically_;
+}
+
+bool SessionController::IsUserSessionBlocked() const {
+  return state_ != session_manager::SessionState::ACTIVE;
+}
+
+session_manager::SessionState SessionController::GetSessionState() const {
+  return state_;
+}
+
+const std::vector<mojom::UserSessionPtr>& SessionController::GetUserSessions()
+    const {
+  return user_sessions_;
+}
+
+void SessionController::LockScreen() {
+  if (client_)
+    client_->RequestLockScreen();
+}
+
+void SessionController::SwitchActiveUser(const AccountId& account_id) {
+  if (client_)
+    client_->SwitchActiveUser(account_id.Serialize());
+}
+
+void SessionController::CycleActiveUser(bool next_user) {
+  if (client_)
+    client_->CycleActiveUser(next_user);
+}
+
+void SessionController::AddSessionStateObserver(
+    SessionStateObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void SessionController::RemoveSessionStateObserver(
+    SessionStateObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void SessionController::SetClient(mojom::SessionControllerClientPtr client) {
+  client_ = std::move(client);
+}
+
+void SessionController::SetSessionInfo(mojom::SessionInfoPtr info) {
+  max_users_ = info->max_users;
+  can_lock_ = info->can_lock_screen;
+  should_lock_screen_automatically_ = info->should_lock_screen_automatically;
+  add_user_session_policy_ = info->add_user_session_policy;
+  SetSessionState(info->state);
+}
+
+void SessionController::UpdateUserSession(mojom::UserSessionPtr user_session) {
+  auto it =
+      std::find_if(user_sessions_.begin(), user_sessions_.end(),
+                   [&user_session](const mojom::UserSessionPtr& session) {
+                     return session->session_id == user_session->session_id;
+                   });
+  if (it == user_sessions_.end()) {
+    AddUserSession(std::move(user_session));
+    return;
+  }
+
+  *it = std::move(user_session);
+  // TODO(xiyuan): Notify observers about meta change to replace things such as
+  //     NOTIFICATION_LOGIN_USER_IMAGE_CHANGED. http://crbug.com/670422
+}
+
+void SessionController::SetUserSessionOrder(
+    const std::vector<uint32_t>& user_session_order) {
+  DCHECK_EQ(user_sessions_.size(), user_session_order.size());
+
+  // Adjusts |user_sessions_| to match the given order.
+  std::vector<mojom::UserSessionPtr> sessions;
+  for (const auto& session_id : user_session_order) {
+    auto it =
+        std::find_if(user_sessions_.begin(), user_sessions_.end(),
+                     [session_id](const mojom::UserSessionPtr& session) {
+                       return session && session->session_id == session_id;
+                     });
+    if (it == user_sessions_.end()) {
+      LOG(ERROR) << "Unknown session id =" << session_id;
+      continue;
+    }
+
+    sessions.push_back(std::move(*it));
+  }
+  user_sessions_.swap(sessions);
+
+  // Check active user change and notifies observers.
+  if (user_sessions_[0]->session_id != active_session_id_) {
+    active_session_id_ = user_sessions_[0]->session_id;
+
+    AccountId account_id(EmptyAccountId());
+    if (AccountId::Deserialize(user_sessions_[0]->serialized_account_id,
+                               &account_id)) {
+      for (auto& observer : observers_)
+        observer.ActiveUserChanged(account_id);
+    }
+  }
+}
+
+void SessionController::SetSessionState(session_manager::SessionState state) {
+  if (state_ == state)
+    return;
+
+  state_ = state;
+  for (auto& observer : observers_)
+    observer.SessionStateChanged(state_);
+}
+
+void SessionController::AddUserSession(mojom::UserSessionPtr user_session) {
+  AccountId account_id(EmptyAccountId());
+  if (!AccountId::Deserialize(user_session->serialized_account_id,
+                              &account_id)) {
+    LOG(ERROR) << "Failed to deserialize account id.";
+    return;
+  }
+
+  user_sessions_.push_back(std::move(user_session));
+
+  for (auto& observer : observers_)
+    observer.UserAddedToSession(account_id);
+}
+
+}  // namespace ash