Sessions API - previously Session Restore API. Supports restoring currently open foreign windows an…

chrome/browser/extensions/api/sessions/sessions_api.cc

Index: chrome/browser/extensions/api/sessions/sessions_api.cc
diff --git a/chrome/browser/extensions/api/sessions/sessions_api.cc b/chrome/browser/extensions/api/sessions/sessions_api.cc
new file mode 100644
index 0000000000000000000000000000000000000000..720ea142cfff135e2f20f89ca65b8fec147bb992
--- /dev/null
+++ b/chrome/browser/extensions/api/sessions/sessions_api.cc
@@ -0,0 +1,593 @@
+// Copyright (c) 2013 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/extensions/api/sessions/sessions_api.h"
+
+#include <vector>
+
+#include "base/i18n/rtl.h"
+#include "base/lazy_instance.h"
+#include "base/prefs/pref_service.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/time/time.h"
+#include "chrome/browser/extensions/api/sessions/session_id.h"
+#include "chrome/browser/extensions/api/tabs/windows_util.h"
+#include "chrome/browser/extensions/extension_function_dispatcher.h"
+#include "chrome/browser/extensions/extension_function_registry.h"
+#include "chrome/browser/extensions/extension_tab_util.h"
+#include "chrome/browser/extensions/window_controller.h"
+#include "chrome/browser/extensions/window_controller_list.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/search/search.h"
+#include "chrome/browser/sessions/session_restore.h"
+#include "chrome/browser/sessions/tab_restore_service_delegate.h"
+#include "chrome/browser/sessions/tab_restore_service_factory.h"
+#include "chrome/browser/sync/glue/session_model_associator.h"
+#include "chrome/browser/sync/glue/synced_session.h"
+#include "chrome/browser/sync/profile_sync_service.h"
+#include "chrome/browser/sync/profile_sync_service_factory.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/host_desktop.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/web_contents.h"
+#include "extensions/common/error_utils.h"
+#include "net/base/net_util.h"
+#include "ui/base/layout.h"
+
+namespace extensions {
+
+namespace GetRecentlyClosed = api::sessions::GetRecentlyClosed;
+namespace GetDevices = api::sessions::GetDevices;
+namespace Restore = api::sessions::Restore;
+namespace tabs = api::tabs;
+namespace windows = api::windows;
+
+const char kNoRecentlyClosedSessionsError[] =
+    "There are no recently closed sessions.";
+const char kInvalidSessionIdError[] = "Invalid session id: \"*\".";
+const char kNoBrowserToRestoreSession[] =
+    "There are no browser windows to restore the session.";
+const char kSessionSyncError[] = "Synced sessions are not available.";
+
+// Comparator function for use with std::sort that will sort sessions by
+// descending modified_time (i.e., most recent first).
+bool SortSessionsByRecency(const browser_sync::SyncedSession* s1,
+                           const browser_sync::SyncedSession* s2) {
+  return s1->modified_time > s2->modified_time;
+}
+
+// Comparator function for use with std::sort that will sort tabs in a window
+// by descending timestamp (i.e., most recent first).
+bool SortTabsByRecency(const SessionTab* t1, const SessionTab* t2) {
+  return t1->timestamp > t2->timestamp;
+}
+
+scoped_ptr<tabs::Tab> CreateTabModelHelper(
+    Profile* profile,
+    const sessions::SerializedNavigationEntry& current_navigation,
+    const std::string& session_id,
+    int index,
+    bool pinned,
+    int selected_index,
+    const Extension* extension) {
+  scoped_ptr<tabs::Tab> tab_struct(new tabs::Tab);
+
+  GURL gurl = current_navigation.virtual_url();
+  std::string title = UTF16ToUTF8(current_navigation.title());
+
+  tab_struct->session_id.reset(new std::string(session_id));
+  tab_struct->url.reset(new std::string(gurl.spec()));
+  if (!title.empty()) {
+    tab_struct->title.reset(new std::string(title));
+  } else {
+    const std::string languages =
+        profile->GetPrefs()->GetString(prefs::kAcceptLanguages);
+    tab_struct->title.reset(new std::string(UTF16ToUTF8(
+        net::FormatUrl(gurl, languages))));
+  }
+  tab_struct->index = index;
+  tab_struct->pinned = pinned;
+  tab_struct->selected = index == selected_index;
+  tab_struct->active = false;
+  tab_struct->highlighted = false;
+  tab_struct->incognito = false;
+  ExtensionTabUtil::ScrubTabForExtension(extension, tab_struct.get());
+  return tab_struct.Pass();
+}
+
+scoped_ptr<windows::Window> CreateWindowModelHelper(
+    scoped_ptr<std::vector<linked_ptr<tabs::Tab> > > tabs,
+    const std::string& session_id,
+    const windows::Window::Type& type,
+    const windows::Window::State& state) {
+  scoped_ptr<windows::Window> window_struct(new windows::Window);
+  window_struct->tabs = tabs.Pass();
+  window_struct->session_id.reset(new std::string(session_id));
+  window_struct->incognito = false;
+  window_struct->always_on_top = false;
+  window_struct->focused = false;
+  window_struct->type = type;
+  window_struct->state = state;
+  return window_struct.Pass();
+}
+
+scoped_ptr<api::sessions::Session> CreateSessionModelHelper(
+    int last_modified,
+    scoped_ptr<tabs::Tab> tab,
+    scoped_ptr<windows::Window> window) {
+  scoped_ptr<api::sessions::Session> session_struct(new api::sessions::Session);
+  session_struct->last_modified = last_modified;
+  if (tab)
+    session_struct->tab = tab.Pass();
+  else if (window)
+    session_struct->window = window.Pass();
+  else
+    NOTREACHED();
+  return session_struct.Pass();
+}
+
+bool is_tab_entry(const TabRestoreService::Entry* entry) {
+  return entry->type == TabRestoreService::TAB;
+}
+
+bool is_window_entry(const TabRestoreService::Entry* entry) {
+  return entry->type == TabRestoreService::WINDOW;
+}
+
+scoped_ptr<tabs::Tab> SessionsGetRecentlyClosedFunction::CreateTabModel(
+    const TabRestoreService::Tab& tab, int session_id, int selected_index) {
+  return CreateTabModelHelper(profile(),
+                              tab.navigations[tab.current_navigation_index],
+                              base::IntToString(session_id),
+                              tab.tabstrip_index,
+                              tab.pinned,
+                              selected_index,
+                              GetExtension());
+}
+
+scoped_ptr<windows::Window>
+    SessionsGetRecentlyClosedFunction::CreateWindowModel(
+        const TabRestoreService::Window& window,
+        int session_id) {
+  DCHECK(!window.tabs.empty());
+
+  scoped_ptr<std::vector<linked_ptr<tabs::Tab> > > tabs(
+      new std::vector<linked_ptr<tabs::Tab> >);
+  for (size_t i = 0; i < window.tabs.size(); ++i) {
+    tabs->push_back(make_linked_ptr(
+        CreateTabModel(window.tabs[i], window.tabs[i].id,
+                       window.selected_tab_index).release()));
+  }
+
+  return CreateWindowModelHelper(tabs.Pass(),
+                                 base::IntToString(session_id),
+                                 windows::Window::TYPE_NORMAL,
+                                 windows::Window::STATE_NORMAL);
+}
+
+scoped_ptr<api::sessions::Session>
+    SessionsGetRecentlyClosedFunction::CreateSessionModel(
+        const TabRestoreService::Entry* entry) {
+  scoped_ptr<tabs::Tab> tab;
+  scoped_ptr<windows::Window> window;
+  switch (entry->type) {
+    case TabRestoreService::TAB:
+      tab = CreateTabModel(
+          *static_cast<const TabRestoreService::Tab*>(entry), entry->id, -1);
+      break;
+    case TabRestoreService::WINDOW:
+      window = CreateWindowModel(
+        *static_cast<const TabRestoreService::Window*>(entry), entry->id);
+      break;
+    default:
+      NOTREACHED();
+  }
+  return CreateSessionModelHelper(entry->timestamp.ToTimeT(),
+                                  tab.Pass(),
+                                  window.Pass());
+}
+
+bool SessionsGetRecentlyClosedFunction::RunImpl() {
+  scoped_ptr<GetRecentlyClosed::Params> params(
+      GetRecentlyClosed::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params);
+  int max_results = api::sessions::MAX_SESSION_RESULTS;
+  if (params->filter && params->filter->max_results)
+    max_results = *params->filter->max_results;
+  EXTENSION_FUNCTION_VALIDATE(max_results >= 0 &&
+      max_results <= api::sessions::MAX_SESSION_RESULTS);
+
+  std::vector<linked_ptr<api::sessions::Session> > result;
+  TabRestoreService* tab_restore_service =
+      TabRestoreServiceFactory::GetForProfile(profile());
+  DCHECK(tab_restore_service);
+
+  // List of entries. They are ordered from most to least recent.
+  // We prune the list to contain max 25 entries at any time and removes
+  // uninteresting entries.
+  TabRestoreService::Entries entries = tab_restore_service->entries();
+  for (TabRestoreService::Entries::const_iterator it = entries.begin();
+       it != entries.end() && static_cast<int>(result.size()) < max_results;
+       ++it) {
+    TabRestoreService::Entry* entry = *it;
+    result.push_back(make_linked_ptr(CreateSessionModel(entry).release()));
+  }
+
+  results_ = GetRecentlyClosed::Results::Create(result);
+  return true;
+}
+
+scoped_ptr<tabs::Tab> SessionsGetDevicesFunction::CreateTabModel(
+    const std::string& session_tag,
+    const SessionTab& tab,
+    int tab_index,
+    int selected_index) {
+  std::string session_id = SessionId(session_tag, tab.tab_id.id()).ToString();
+  return CreateTabModelHelper(profile(),
+                              tab.navigations[tab.current_navigation_index],
+                              session_id,
+                              tab_index,
+                              tab.pinned,
+                              selected_index,
+                              GetExtension());
+}
+
+scoped_ptr<windows::Window> SessionsGetDevicesFunction::CreateWindowModel(
+        const SessionWindow& window, const std::string& session_tag) {
+  DCHECK(!window.tabs.empty());
+
+  // Prune tabs that are not syncable or are NewTabPage. Then, sort the tabs
+  // from most recent to least recent.
+  std::vector<const SessionTab*> tabs_in_window;
+  for (size_t i = 0; i < window.tabs.size(); ++i) {
+    const SessionTab* tab = window.tabs[i];
+    if (tab->navigations.empty())
+      continue;
+    const sessions::SerializedNavigationEntry& current_navigation =
+        tab->navigations.at(tab->normalized_navigation_index());
+    if (chrome::IsNTPURL(current_navigation.virtual_url(), profile())) {
+      continue;
+    }
+    tabs_in_window.push_back(tab);
+  }
+  if (tabs_in_window.empty())
+    return scoped_ptr<windows::Window>();
+  std::sort(tabs_in_window.begin(), tabs_in_window.end(), SortTabsByRecency);
+
+  scoped_ptr<std::vector<linked_ptr<tabs::Tab> > > tabs(
+      new std::vector<linked_ptr<tabs::Tab> >);
+  for (size_t i = 0; i < window.tabs.size(); ++i) {
+    tabs->push_back(make_linked_ptr(
+        CreateTabModel(session_tag, *window.tabs[i], i,
+                       window.selected_tab_index).release()));
+  }
+
+  std::string session_id =
+      SessionId(session_tag, window.window_id.id()).ToString();
+
+  windows::Window::Type type = windows::Window::TYPE_NONE;
+  switch (window.type) {
+    case Browser::TYPE_TABBED:
+      type = windows::Window::TYPE_NORMAL;
+      break;
+    case Browser::TYPE_POPUP:
+      type = windows::Window::TYPE_POPUP;
+      break;
+  }
+
+  windows::Window::State state = windows::Window::STATE_NONE;
+  switch (window.show_state) {
+    case ui::SHOW_STATE_NORMAL:
+      state = windows::Window::STATE_NORMAL;
+      break;
+    case ui::SHOW_STATE_MINIMIZED:
+      state = windows::Window::STATE_MINIMIZED;
+      break;
+    case ui::SHOW_STATE_MAXIMIZED:
+      state = windows::Window::STATE_MAXIMIZED;
+      break;
+    case ui::SHOW_STATE_FULLSCREEN:
+      state = windows::Window::STATE_FULLSCREEN;
+      break;
+    case ui::SHOW_STATE_DEFAULT:
+    case ui::SHOW_STATE_INACTIVE:
+    case ui::SHOW_STATE_DETACHED:
+    case ui::SHOW_STATE_END:
+      break;
+  }
+
+  scoped_ptr<windows::Window> window_struct(
+      CreateWindowModelHelper(tabs.Pass(), session_id, type, state));
+  // TODO(dwankri): Dig deeper to resolve bounds not being optional, so closed
+  // windows in GetRecentlyClosed can have set values in Window helper.
+  window_struct->left.reset(new int(window.bounds.x()));
+  window_struct->top.reset(new int(window.bounds.y()));
+  window_struct->width.reset(new int(window.bounds.width()));
+  window_struct->height.reset(new int(window.bounds.height()));
+
+  return window_struct.Pass();
+}
+
+scoped_ptr<api::sessions::Session>
+SessionsGetDevicesFunction::CreateSessionModel(
+    const SessionWindow& window, const std::string& session_tag) {
+  scoped_ptr<windows::Window> window_model(
+      CreateWindowModel(window, session_tag));
+  // There is a chance that after pruning uninteresting tabs the window will be
+  // empty.
+  return !window_model ? scoped_ptr<api::sessions::Session>()
+      : CreateSessionModelHelper(window.timestamp.ToTimeT(),
+                                 scoped_ptr<tabs::Tab>(),
+                                 window_model.Pass());
+}
+
+scoped_ptr<api::sessions::Device> SessionsGetDevicesFunction::CreateDeviceModel(
+    const browser_sync::SyncedSession* session) {
+  int max_results = api::sessions::MAX_SESSION_RESULTS;
+  // Already validated in RunImpl().
+  scoped_ptr<GetDevices::Params> params(GetDevices::Params::Create(*args_));
+  if (params->filter && params->filter->max_results)
+    max_results = *params->filter->max_results;
+
+  scoped_ptr<api::sessions::Device> device_struct(new api::sessions::Device);
+  device_struct->info = session->session_name;
+
+  for (browser_sync::SyncedSession::SyncedWindowMap::const_iterator it =
+       session->windows.begin(); it != session->windows.end() &&
+       static_cast<int>(device_struct->sessions.size()) < max_results; ++it) {
+    scoped_ptr<api::sessions::Session> session_model(CreateSessionModel(
+        *it->second, session->session_tag));
+    if (session_model)
+      device_struct->sessions.push_back(make_linked_ptr(
+          session_model.release()));
+  }
+  return device_struct.Pass();
+}
+
+bool SessionsGetDevicesFunction::RunImpl() {
+  ProfileSyncService* service =
+      ProfileSyncServiceFactory::GetInstance()->GetForProfile(profile());
+  if (!(service && service->GetPreferredDataTypes().Has(syncer::SESSIONS))) {
+    // Sync not enabled.
+    results_ = GetDevices::Results::Create(
+        std::vector<linked_ptr<api::sessions::Device> >());
+    return true;
+  }
+
+  browser_sync::SessionModelAssociator* associator =
+      service->GetSessionModelAssociator();
+  std::vector<const browser_sync::SyncedSession*> sessions;
+  if (!(associator && associator->GetAllForeignSessions(&sessions))) {
+    results_ = GetDevices::Results::Create(
+        std::vector<linked_ptr<api::sessions::Device> >());
+    return true;
+  }
+
+  scoped_ptr<GetDevices::Params> params(GetDevices::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params);
+  if (params->filter && params->filter->max_results) {
+    EXTENSION_FUNCTION_VALIDATE(*params->filter->max_results >= 0 &&
+        *params->filter->max_results <= api::sessions::MAX_SESSION_RESULTS);
+  }
+
+  std::vector<linked_ptr<api::sessions::Device> > result;
+  // Sort sessions from most recent to least recent.
+  std::sort(sessions.begin(), sessions.end(), SortSessionsByRecency);
+  for (size_t i = 0; i < sessions.size(); ++i) {
+    result.push_back(make_linked_ptr(CreateDeviceModel(sessions[i]).release()));
+  }
+
+  results_ = GetDevices::Results::Create(result);
+  return true;
+}
+
+void SessionsRestoreFunction::SetInvalidIdError(const std::string& invalid_id) {
+  SetError(ErrorUtils::FormatErrorMessage(kInvalidSessionIdError, invalid_id));
+}
+
+
+void SessionsRestoreFunction::SetResultRestoredTab(
+    const content::WebContents* contents) {
+  scoped_ptr<tabs::Tab> tab(tabs::Tab::FromValue(
+      *ExtensionTabUtil::CreateTabValue(contents, GetExtension())));
+  scoped_ptr<api::sessions::Session> restored_session(CreateSessionModelHelper(
+      base::Time::Now().ToTimeT(),
+      tab.Pass(),
+      scoped_ptr<windows::Window>()));
+  results_ = Restore::Results::Create(*restored_session);
+}
+
+bool SessionsRestoreFunction::SetResultRestoredWindow(int window_id) {
+    WindowController* controller = NULL;
+  if (!windows_util::GetWindowFromWindowID(this, window_id, &controller)) {
+    // error_ is set by GetWindowFromWindowId function call.
+    return false;
+  }
+  scoped_ptr<windows::Window> window(windows::Window::FromValue(
+      *controller->CreateWindowValueWithTabs(GetExtension())));
+  results_ = Restore::Results::Create(*CreateSessionModelHelper(
+      base::Time::Now().ToTimeT(),
+      scoped_ptr<tabs::Tab>(),
+      window.Pass()));
+  return true;
+}
+
+bool SessionsRestoreFunction::RestoreMostRecentlyClosed(Browser* browser) {
+  TabRestoreService* tab_restore_service =
+      TabRestoreServiceFactory::GetForProfile(profile());
+  chrome::HostDesktopType host_desktop_type = browser->host_desktop_type();
+  TabRestoreService::Entries entries = tab_restore_service->entries();
+
+  if (entries.empty()) {
+    SetError(kNoRecentlyClosedSessionsError);
+    return false;
+  }
+
+  bool is_window = is_window_entry(entries.front());
+  TabRestoreServiceDelegate* delegate =
+      TabRestoreServiceDelegate::FindDelegateForWebContents(
+          browser->tab_strip_model()->GetActiveWebContents());
+  std::vector<content::WebContents*> contents =
+      tab_restore_service->RestoreMostRecentEntry(delegate, host_desktop_type);
+  DCHECK(contents.size());
+
+  if (is_window) {
+    return SetResultRestoredWindow(
+        ExtensionTabUtil::GetWindowIdOfTab(contents[0]));
+  }
+
+  SetResultRestoredTab(contents[0]);
+  return true;
+}
+
+bool SessionsRestoreFunction::RestoreLocalSession(const SessionId& session_id,
+                                                  Browser* browser) {
+  TabRestoreService* tab_restore_service =
+      TabRestoreServiceFactory::GetForProfile(profile());
+  chrome::HostDesktopType host_desktop_type = browser->host_desktop_type();
+  TabRestoreService::Entries entries = tab_restore_service->entries();
+
+  if (entries.empty()) {
+    SetInvalidIdError(session_id.ToString());
+    return false;
+  }
+
+  // Check if the recently closed list contains an entry with the provided id.
+  bool is_window = false;
+  for (TabRestoreService::Entries::iterator it = entries.begin();
+       it != entries.end(); ++it) {
+    if ((*it)->id == session_id.id()) {
+      // The only time a full window is being restored is if the entry ID
+      // matches the provided ID and the entry type is Window.
+      is_window = is_window_entry(*it);
+      break;
+    }
+  }
+
+  TabRestoreServiceDelegate* delegate =
+      TabRestoreServiceDelegate::FindDelegateForWebContents(
+          browser->tab_strip_model()->GetActiveWebContents());
+  std::vector<content::WebContents*> contents =
+      tab_restore_service->RestoreEntryById(delegate,
+                                            session_id.id(),
+                                            host_desktop_type,
+                                            UNKNOWN);
+  // If the ID is invalid, contents will be empty.
+  if (!contents.size()) {
+    SetInvalidIdError(session_id.ToString());
+    return false;
+  }
+
+  // Retrieve the window through any of the tabs in contents.
+  if (is_window) {
+    return SetResultRestoredWindow(
+        ExtensionTabUtil::GetWindowIdOfTab(contents[0]));
+  }
+
+  SetResultRestoredTab(contents[0]);
+  return true;
+}
+
+bool SessionsRestoreFunction::RestoreForeignSession(const SessionId& session_id,
+                                                    Browser* browser) {
+  ProfileSyncService* service =
+      ProfileSyncServiceFactory::GetInstance()->GetForProfile(profile());
+  if (!(service && service->GetPreferredDataTypes().Has(syncer::SESSIONS))) {
+    SetError(kSessionSyncError);
+    return false;
+  }
+  browser_sync::SessionModelAssociator* associator =
+      service->GetSessionModelAssociator();
+  if (!associator) {
+    SetError(kSessionSyncError);
+    return false;
+  }
+
+  const SessionTab* tab = NULL;
+  if (associator->GetForeignTab(session_id.session_tag(),
+                                session_id.id(),
+                                &tab)) {
+    TabStripModel* tab_strip = browser->tab_strip_model();
+    content::WebContents* contents = tab_strip->GetActiveWebContents();
+
+    content::WebContents* tab_contents =
+        SessionRestore::RestoreForeignSessionTab(contents, *tab,
+                                                 NEW_FOREGROUND_TAB);
+    SetResultRestoredTab(tab_contents);
+    return true;
+  }
+
+  // Restoring a full window.
+  std::vector<const SessionWindow*> windows;
+  if (!associator->GetForeignSession(session_id.session_tag(), &windows)) {
+    SetInvalidIdError(session_id.ToString());
+    return false;
+  }
+
+  std::vector<const SessionWindow*>::const_iterator window = windows.begin();
+  while (window != windows.end()
+         && (*window)->window_id.id() != session_id.id()) {
+    ++window;
+  }
+  if (window == windows.end()) {
+    SetInvalidIdError(session_id.ToString());
+    return false;
+  }
+
+  chrome::HostDesktopType host_desktop_type = browser->host_desktop_type();
+  // Only restore one window at a time.
+  std::vector<Browser*> browsers =
+      SessionRestore::RestoreForeignSessionWindows(profile(), host_desktop_type,
+                                                   window, window + 1);
+  // Will always create one browser because we only restore one window per call.
+  DCHECK_EQ(1u, browsers.size());
+  return SetResultRestoredWindow(ExtensionTabUtil::GetWindowId(browsers[0]));
+}
+
+bool SessionsRestoreFunction::RunImpl() {
+  scoped_ptr<Restore::Params> params(Restore::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params);
+
+  Browser* browser =
+      chrome::FindBrowserWithProfile(profile(),
+                                     chrome::HOST_DESKTOP_TYPE_NATIVE);
+  if (!browser) {
+    SetError(kNoBrowserToRestoreSession);
+    return false;
+  }
+
+  if (!params->session_id)
+    return RestoreMostRecentlyClosed(browser);
+
+  scoped_ptr<SessionId> session_id(SessionId::Parse(*params->session_id));
+  if (!session_id) {
+    SetInvalidIdError(*params->session_id);
+    return false;
+  }
+
+  return session_id->IsForeign() ?
+      RestoreForeignSession(*session_id, browser)
+      : RestoreLocalSession(*session_id, browser);
+}
+
+SessionsAPI::SessionsAPI(Profile* profile) {
+}
+
+SessionsAPI::~SessionsAPI() {
+}
+
+static base::LazyInstance<ProfileKeyedAPIFactory<SessionsAPI> >
+    g_factory = LAZY_INSTANCE_INITIALIZER;
+
+// static
+ProfileKeyedAPIFactory<SessionsAPI>*
+    SessionsAPI::GetFactoryInstance() {
+  return &g_factory.Get();
+}
+
+}  // namespace extensions