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

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/extensions/api/sessions/sessions_api.h"
   6
   7 #include <vector>
   8
   9 #include "base/i18n/rtl.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/stringprintf.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "base/time/time.h"
  16 #include "chrome/browser/extensions/api/sessions/session_id.h"
  17 #include "chrome/browser/extensions/api/tabs/windows_util.h"
  18 #include "chrome/browser/extensions/extension_tab_util.h"
  19 #include "chrome/browser/extensions/window_controller.h"
  20 #include "chrome/browser/extensions/window_controller_list.h"
  21 #include "chrome/browser/profiles/profile.h"
  22 #include "chrome/browser/search/search.h"
  23 #include "chrome/browser/sessions/session_restore.h"
  24 #include "chrome/browser/sessions/tab_restore_service_delegate.h"
  25 #include "chrome/browser/sessions/tab_restore_service_factory.h"
  26 #include "chrome/browser/sync/glue/synced_session.h"
  27 #include "chrome/browser/sync/open_tabs_ui_delegate.h"
  28 #include "chrome/browser/sync/profile_sync_service.h"
  29 #include "chrome/browser/sync/profile_sync_service_factory.h"
  30 #include "chrome/browser/ui/browser.h"
  31 #include "chrome/browser/ui/browser_finder.h"
  32 #include "chrome/browser/ui/host_desktop.h"
  33 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  34 #include "chrome/common/pref_names.h"
  35 #include "content/public/browser/web_contents.h"
  36 #include "extensions/browser/extension_function_dispatcher.h"
  37 #include "extensions/browser/extension_function_registry.h"
  38 #include "extensions/browser/extension_system.h"
  39 #include "extensions/common/error_utils.h"
  40 #include "net/base/net_util.h"
  41 #include "ui/base/layout.h"
  42
  43 namespace extensions {
  44
  45 namespace GetRecentlyClosed = api::sessions::GetRecentlyClosed;
  46 namespace GetDevices = api::sessions::GetDevices;
  47 namespace Restore = api::sessions::Restore;
  48 namespace tabs = api::tabs;
  49 namespace windows = api::windows;
  50
  51 const char kNoRecentlyClosedSessionsError[] =
  52     "There are no recently closed sessions.";
  53 const char kInvalidSessionIdError[] = "Invalid session id: \"*\".";
  54 const char kNoBrowserToRestoreSession[] =
  55     "There are no browser windows to restore the session.";
  56 const char kSessionSyncError[] = "Synced sessions are not available.";
  57 const char kRestoreInIncognitoError[] =
  58     "Can not restore sessions in incognito mode.";
  59
  60 // Comparator function for use with std::sort that will sort sessions by
  61 // descending modified_time (i.e., most recent first).
  62 bool SortSessionsByRecency(const browser_sync::SyncedSession* s1,
  63                            const browser_sync::SyncedSession* s2) {
  64   return s1->modified_time > s2->modified_time;
  65 }
  66
  67 // Comparator function for use with std::sort that will sort tabs in a window
  68 // by descending timestamp (i.e., most recent first).
  69 bool SortTabsByRecency(const sessions::SessionTab* t1,
  70                        const sessions::SessionTab* t2) {
  71   return t1->timestamp > t2->timestamp;
  72 }
  73
  74 scoped_ptr<tabs::Tab> CreateTabModelHelper(
  75     Profile* profile,
  76     const sessions::SerializedNavigationEntry& current_navigation,
  77     const std::string& session_id,
  78     int index,
  79     bool pinned,
  80     int selected_index,
  81     const Extension* extension) {
  82   scoped_ptr<tabs::Tab> tab_struct(new tabs::Tab);
  83
  84   const GURL& url = current_navigation.virtual_url();
  85   std::string title = base::UTF16ToUTF8(current_navigation.title());
  86
  87   tab_struct->session_id.reset(new std::string(session_id));
  88   tab_struct->url.reset(new std::string(url.spec()));
  89   tab_struct->fav_icon_url.reset(
  90       new std::string(current_navigation.favicon_url().spec()));
  91   if (!title.empty()) {
  92     tab_struct->title.reset(new std::string(title));
  93   } else {
  94     const std::string languages =
  95         profile->GetPrefs()->GetString(prefs::kAcceptLanguages);
  96     tab_struct->title.reset(
  97         new std::string(base::UTF16ToUTF8(net::FormatUrl(url, languages))));
  98   }
  99   tab_struct->index = index;
 100   tab_struct->pinned = pinned;
 101   // Note: |selected_index| from the sync sessions model is what we call
 102   // "active" in extensions terminology.  "selected" is deprecated because it's
 103   // not clear whether it means "active" (user can see) or "highlighted" (user
 104   // has highlighted, since you can select tabs without bringing them into the
 105   // foreground).
 106   tab_struct->active = index == selected_index;
 107   ExtensionTabUtil::ScrubTabForExtension(extension, tab_struct.get());
 108   return tab_struct.Pass();
 109 }
 110
 111 scoped_ptr<windows::Window> CreateWindowModelHelper(
 112     scoped_ptr<std::vector<linked_ptr<tabs::Tab>>> tabs,
 113     const std::string& session_id,
 114     const windows::WindowType& type,
 115     const windows::WindowState& state) {
 116   scoped_ptr<windows::Window> window_struct(new windows::Window);
 117   window_struct->tabs = tabs.Pass();
 118   window_struct->session_id.reset(new std::string(session_id));
 119   window_struct->incognito = false;
 120   window_struct->always_on_top = false;
 121   window_struct->focused = false;
 122   window_struct->type = type;
 123   window_struct->state = state;
 124   return window_struct.Pass();
 125 }
 126
 127 scoped_ptr<api::sessions::Session> CreateSessionModelHelper(
 128     int last_modified,
 129     scoped_ptr<tabs::Tab> tab,
 130     scoped_ptr<windows::Window> window) {
 131   scoped_ptr<api::sessions::Session> session_struct(new api::sessions::Session);
 132   session_struct->last_modified = last_modified;
 133   if (tab)
 134     session_struct->tab = tab.Pass();
 135   else if (window)
 136     session_struct->window = window.Pass();
 137   else
 138     NOTREACHED();
 139   return session_struct.Pass();
 140 }
 141
 142 bool is_tab_entry(const TabRestoreService::Entry* entry) {
 143   return entry->type == TabRestoreService::TAB;
 144 }
 145
 146 bool is_window_entry(const TabRestoreService::Entry* entry) {
 147   return entry->type == TabRestoreService::WINDOW;
 148 }
 149
 150 scoped_ptr<tabs::Tab> SessionsGetRecentlyClosedFunction::CreateTabModel(
 151     const TabRestoreService::Tab& tab, int session_id, int selected_index) {
 152   return CreateTabModelHelper(GetProfile(),
 153                               tab.navigations[tab.current_navigation_index],
 154                               base::IntToString(session_id),
 155                               tab.tabstrip_index,
 156                               tab.pinned,
 157                               selected_index,
 158                               extension());
 159 }
 160
 161 scoped_ptr<windows::Window>
 162     SessionsGetRecentlyClosedFunction::CreateWindowModel(
 163         const TabRestoreService::Window& window,
 164         int session_id) {
 165   DCHECK(!window.tabs.empty());
 166
 167   scoped_ptr<std::vector<linked_ptr<tabs::Tab> > > tabs(
 168       new std::vector<linked_ptr<tabs::Tab> >);
 169   for (size_t i = 0; i < window.tabs.size(); ++i) {
 170     tabs->push_back(make_linked_ptr(
 171         CreateTabModel(window.tabs[i], window.tabs[i].id,
 172                        window.selected_tab_index).release()));
 173   }
 174
 175   return CreateWindowModelHelper(tabs.Pass(), base::IntToString(session_id),
 176                                  windows::WINDOW_TYPE_NORMAL,
 177                                  windows::WINDOW_STATE_NORMAL);
 178 }
 179
 180 scoped_ptr<api::sessions::Session>
 181     SessionsGetRecentlyClosedFunction::CreateSessionModel(
 182         const TabRestoreService::Entry* entry) {
 183   scoped_ptr<tabs::Tab> tab;
 184   scoped_ptr<windows::Window> window;
 185   switch (entry->type) {
 186     case TabRestoreService::TAB:
 187       tab = CreateTabModel(
 188           *static_cast<const TabRestoreService::Tab*>(entry), entry->id, -1);
 189       break;
 190     case TabRestoreService::WINDOW:
 191       window = CreateWindowModel(
 192         *static_cast<const TabRestoreService::Window*>(entry), entry->id);
 193       break;
 194     default:
 195       NOTREACHED();
 196   }
 197   return CreateSessionModelHelper(entry->timestamp.ToTimeT(),
 198                                   tab.Pass(),
 199                                   window.Pass());
 200 }
 201
 202 bool SessionsGetRecentlyClosedFunction::RunSync() {
 203   scoped_ptr<GetRecentlyClosed::Params> params(
 204       GetRecentlyClosed::Params::Create(*args_));
 205   EXTENSION_FUNCTION_VALIDATE(params);
 206   int max_results = api::sessions::MAX_SESSION_RESULTS;
 207   if (params->filter && params->filter->max_results)
 208     max_results = *params->filter->max_results;
 209   EXTENSION_FUNCTION_VALIDATE(max_results >= 0 &&
 210       max_results <= api::sessions::MAX_SESSION_RESULTS);
 211
 212   std::vector<linked_ptr<api::sessions::Session> > result;
 213   TabRestoreService* tab_restore_service =
 214       TabRestoreServiceFactory::GetForProfile(GetProfile());
 215
 216   // TabRestoreServiceFactory::GetForProfile() can return NULL (i.e., when in
 217   // incognito mode)
 218   if (!tab_restore_service) {
 219     DCHECK_NE(GetProfile(), GetProfile()->GetOriginalProfile())
 220         << "TabRestoreService expected for normal profiles";
 221     results_ = GetRecentlyClosed::Results::Create(
 222         std::vector<linked_ptr<api::sessions::Session> >());
 223     return true;
 224   }
 225
 226   // List of entries. They are ordered from most to least recent.
 227   // We prune the list to contain max 25 entries at any time and removes
 228   // uninteresting entries.
 229   TabRestoreService::Entries entries = tab_restore_service->entries();
 230   for (TabRestoreService::Entries::const_iterator it = entries.begin();
 231        it != entries.end() && static_cast<int>(result.size()) < max_results;
 232        ++it) {
 233     TabRestoreService::Entry* entry = *it;
 234     result.push_back(make_linked_ptr(CreateSessionModel(entry).release()));
 235   }
 236
 237   results_ = GetRecentlyClosed::Results::Create(result);
 238   return true;
 239 }
 240
 241 scoped_ptr<tabs::Tab> SessionsGetDevicesFunction::CreateTabModel(
 242     const std::string& session_tag,
 243     const sessions::SessionTab& tab,
 244     int tab_index,
 245     int selected_index) {
 246   std::string session_id = SessionId(session_tag, tab.tab_id.id()).ToString();
 247   return CreateTabModelHelper(
 248       GetProfile(),
 249       tab.navigations[tab.normalized_navigation_index()],
 250       session_id,
 251       tab_index,
 252       tab.pinned,
 253       selected_index,
 254       extension());
 255 }
 256
 257 scoped_ptr<windows::Window> SessionsGetDevicesFunction::CreateWindowModel(
 258         const sessions::SessionWindow& window, const std::string& session_tag) {
 259   DCHECK(!window.tabs.empty());
 260
 261   // Prune tabs that are not syncable or are NewTabPage. Then, sort the tabs
 262   // from most recent to least recent.
 263   std::vector<const sessions::SessionTab*> tabs_in_window;
 264   for (size_t i = 0; i < window.tabs.size(); ++i) {
 265     const sessions::SessionTab* tab = window.tabs[i];
 266     if (tab->navigations.empty())
 267       continue;
 268     const sessions::SerializedNavigationEntry& current_navigation =
 269         tab->navigations.at(tab->normalized_navigation_index());
 270     if (chrome::IsNTPURL(current_navigation.virtual_url(), GetProfile())) {
 271       continue;
 272     }
 273     tabs_in_window.push_back(tab);
 274   }
 275   if (tabs_in_window.empty())
 276     return scoped_ptr<windows::Window>();
 277   std::sort(tabs_in_window.begin(), tabs_in_window.end(), SortTabsByRecency);
 278
 279   scoped_ptr<std::vector<linked_ptr<tabs::Tab> > > tabs(
 280       new std::vector<linked_ptr<tabs::Tab> >);
 281   for (size_t i = 0; i < tabs_in_window.size(); ++i) {
 282     tabs->push_back(make_linked_ptr(
 283         CreateTabModel(session_tag, *tabs_in_window[i], i,
 284                        window.selected_tab_index).release()));
 285   }
 286
 287   std::string session_id =
 288       SessionId(session_tag, window.window_id.id()).ToString();
 289
 290   windows::WindowType type = windows::WINDOW_TYPE_NONE;
 291   switch (window.type) {
 292     case sessions::SessionWindow::TYPE_TABBED:
 293       type = windows::WINDOW_TYPE_NORMAL;
 294       break;
 295     case sessions::SessionWindow::TYPE_POPUP:
 296       type = windows::WINDOW_TYPE_POPUP;
 297       break;
 298   }
 299
 300   windows::WindowState state = windows::WINDOW_STATE_NONE;
 301   switch (window.show_state) {
 302     case ui::SHOW_STATE_NORMAL:
 303       state = windows::WINDOW_STATE_NORMAL;
 304       break;
 305     case ui::SHOW_STATE_MINIMIZED:
 306       state = windows::WINDOW_STATE_MINIMIZED;
 307       break;
 308     case ui::SHOW_STATE_MAXIMIZED:
 309       state = windows::WINDOW_STATE_MAXIMIZED;
 310       break;
 311     case ui::SHOW_STATE_FULLSCREEN:
 312       state = windows::WINDOW_STATE_FULLSCREEN;
 313       break;
 314     case ui::SHOW_STATE_DEFAULT:
 315     case ui::SHOW_STATE_INACTIVE:
 316     case ui::SHOW_STATE_END:
 317       break;
 318   }
 319
 320   scoped_ptr<windows::Window> window_struct(
 321       CreateWindowModelHelper(tabs.Pass(), session_id, type, state));
 322   // TODO(dwankri): Dig deeper to resolve bounds not being optional, so closed
 323   // windows in GetRecentlyClosed can have set values in Window helper.
 324   window_struct->left.reset(new int(window.bounds.x()));
 325   window_struct->top.reset(new int(window.bounds.y()));
 326   window_struct->width.reset(new int(window.bounds.width()));
 327   window_struct->height.reset(new int(window.bounds.height()));
 328
 329   return window_struct.Pass();
 330 }
 331
 332 scoped_ptr<api::sessions::Session>
 333 SessionsGetDevicesFunction::CreateSessionModel(
 334     const sessions::SessionWindow& window, const std::string& session_tag) {
 335   scoped_ptr<windows::Window> window_model(
 336       CreateWindowModel(window, session_tag));
 337   // There is a chance that after pruning uninteresting tabs the window will be
 338   // empty.
 339   return !window_model ? scoped_ptr<api::sessions::Session>()
 340       : CreateSessionModelHelper(window.timestamp.ToTimeT(),
 341                                  scoped_ptr<tabs::Tab>(),
 342                                  window_model.Pass());
 343 }
 344
 345 scoped_ptr<api::sessions::Device> SessionsGetDevicesFunction::CreateDeviceModel(
 346     const browser_sync::SyncedSession* session) {
 347   int max_results = api::sessions::MAX_SESSION_RESULTS;
 348   // Already validated in RunAsync().
 349   scoped_ptr<GetDevices::Params> params(GetDevices::Params::Create(*args_));
 350   if (params->filter && params->filter->max_results)
 351     max_results = *params->filter->max_results;
 352
 353   scoped_ptr<api::sessions::Device> device_struct(new api::sessions::Device);
 354   device_struct->info = session->session_name;
 355   device_struct->device_name = session->session_name;
 356
 357   for (browser_sync::SyncedSession::SyncedWindowMap::const_iterator it =
 358        session->windows.begin(); it != session->windows.end() &&
 359        static_cast<int>(device_struct->sessions.size()) < max_results; ++it) {
 360     scoped_ptr<api::sessions::Session> session_model(CreateSessionModel(
 361         *it->second, session->session_tag));
 362     if (session_model)
 363       device_struct->sessions.push_back(make_linked_ptr(
 364           session_model.release()));
 365   }
 366   return device_struct.Pass();
 367 }
 368
 369 bool SessionsGetDevicesFunction::RunSync() {
 370   ProfileSyncService* service =
 371       ProfileSyncServiceFactory::GetInstance()->GetForProfile(GetProfile());
 372   if (!(service && service->GetPreferredDataTypes().Has(syncer::SESSIONS))) {
 373     // Sync not enabled.
 374     results_ = GetDevices::Results::Create(
 375         std::vector<linked_ptr<api::sessions::Device> >());
 376     return true;
 377   }
 378
 379   browser_sync::OpenTabsUIDelegate* open_tabs =
 380       service->GetOpenTabsUIDelegate();
 381   std::vector<const browser_sync::SyncedSession*> sessions;
 382   if (!(open_tabs && open_tabs->GetAllForeignSessions(&sessions))) {
 383     results_ = GetDevices::Results::Create(
 384         std::vector<linked_ptr<api::sessions::Device> >());
 385     return true;
 386   }
 387
 388   scoped_ptr<GetDevices::Params> params(GetDevices::Params::Create(*args_));
 389   EXTENSION_FUNCTION_VALIDATE(params);
 390   if (params->filter && params->filter->max_results) {
 391     EXTENSION_FUNCTION_VALIDATE(*params->filter->max_results >= 0 &&
 392         *params->filter->max_results <= api::sessions::MAX_SESSION_RESULTS);
 393   }
 394
 395   std::vector<linked_ptr<api::sessions::Device> > result;
 396   // Sort sessions from most recent to least recent.
 397   std::sort(sessions.begin(), sessions.end(), SortSessionsByRecency);
 398   for (size_t i = 0; i < sessions.size(); ++i) {
 399     result.push_back(make_linked_ptr(CreateDeviceModel(sessions[i]).release()));
 400   }
 401
 402   results_ = GetDevices::Results::Create(result);
 403   return true;
 404 }
 405
 406 void SessionsRestoreFunction::SetInvalidIdError(const std::string& invalid_id) {
 407   SetError(ErrorUtils::FormatErrorMessage(kInvalidSessionIdError, invalid_id));
 408 }
 409
 410
 411 void SessionsRestoreFunction::SetResultRestoredTab(
 412     content::WebContents* contents) {
 413   scoped_ptr<base::DictionaryValue> tab_value(
 414       ExtensionTabUtil::CreateTabValue(contents, extension()));
 415   scoped_ptr<tabs::Tab> tab(tabs::Tab::FromValue(*tab_value));
 416   scoped_ptr<api::sessions::Session> restored_session(CreateSessionModelHelper(
 417       base::Time::Now().ToTimeT(),
 418       tab.Pass(),
 419       scoped_ptr<windows::Window>()));
 420   results_ = Restore::Results::Create(*restored_session);
 421 }
 422
 423 bool SessionsRestoreFunction::SetResultRestoredWindow(int window_id) {
 424   WindowController* controller = NULL;
 425   if (!windows_util::GetWindowFromWindowID(this, window_id, &controller)) {
 426     // error_ is set by GetWindowFromWindowId function call.
 427     return false;
 428   }
 429   scoped_ptr<base::DictionaryValue> window_value(
 430       controller->CreateWindowValueWithTabs(extension()));
 431   scoped_ptr<windows::Window> window(windows::Window::FromValue(
 432       *window_value));
 433   results_ = Restore::Results::Create(*CreateSessionModelHelper(
 434       base::Time::Now().ToTimeT(),
 435       scoped_ptr<tabs::Tab>(),
 436       window.Pass()));
 437   return true;
 438 }
 439
 440 bool SessionsRestoreFunction::RestoreMostRecentlyClosed(Browser* browser) {
 441   TabRestoreService* tab_restore_service =
 442       TabRestoreServiceFactory::GetForProfile(GetProfile());
 443   chrome::HostDesktopType host_desktop_type = browser->host_desktop_type();
 444   TabRestoreService::Entries entries = tab_restore_service->entries();
 445
 446   if (entries.empty()) {
 447     SetError(kNoRecentlyClosedSessionsError);
 448     return false;
 449   }
 450
 451   bool is_window = is_window_entry(entries.front());
 452   TabRestoreServiceDelegate* delegate =
 453       TabRestoreServiceDelegate::FindDelegateForWebContents(
 454           browser->tab_strip_model()->GetActiveWebContents());
 455   std::vector<content::WebContents*> contents =
 456       tab_restore_service->RestoreMostRecentEntry(delegate, host_desktop_type);
 457   DCHECK(contents.size());
 458
 459   if (is_window) {
 460     return SetResultRestoredWindow(
 461         ExtensionTabUtil::GetWindowIdOfTab(contents[0]));
 462   }
 463
 464   SetResultRestoredTab(contents[0]);
 465   return true;
 466 }
 467
 468 bool SessionsRestoreFunction::RestoreLocalSession(const SessionId& session_id,
 469                                                   Browser* browser) {
 470   TabRestoreService* tab_restore_service =
 471       TabRestoreServiceFactory::GetForProfile(GetProfile());
 472   chrome::HostDesktopType host_desktop_type = browser->host_desktop_type();
 473   TabRestoreService::Entries entries = tab_restore_service->entries();
 474
 475   if (entries.empty()) {
 476     SetInvalidIdError(session_id.ToString());
 477     return false;
 478   }
 479
 480   // Check if the recently closed list contains an entry with the provided id.
 481   bool is_window = false;
 482   for (TabRestoreService::Entries::iterator it = entries.begin();
 483        it != entries.end(); ++it) {
 484     if ((*it)->id == session_id.id()) {
 485       // The only time a full window is being restored is if the entry ID
 486       // matches the provided ID and the entry type is Window.
 487       is_window = is_window_entry(*it);
 488       break;
 489     }
 490   }
 491
 492   TabRestoreServiceDelegate* delegate =
 493       TabRestoreServiceDelegate::FindDelegateForWebContents(
 494           browser->tab_strip_model()->GetActiveWebContents());
 495   std::vector<content::WebContents*> contents =
 496       tab_restore_service->RestoreEntryById(delegate,
 497                                             session_id.id(),
 498                                             host_desktop_type,
 499                                             UNKNOWN);
 500   // If the ID is invalid, contents will be empty.
 501   if (!contents.size()) {
 502     SetInvalidIdError(session_id.ToString());
 503     return false;
 504   }
 505
 506   // Retrieve the window through any of the tabs in contents.
 507   if (is_window) {
 508     return SetResultRestoredWindow(
 509         ExtensionTabUtil::GetWindowIdOfTab(contents[0]));
 510   }
 511
 512   SetResultRestoredTab(contents[0]);
 513   return true;
 514 }
 515
 516 bool SessionsRestoreFunction::RestoreForeignSession(const SessionId& session_id,
 517                                                     Browser* browser) {
 518   ProfileSyncService* service =
 519       ProfileSyncServiceFactory::GetInstance()->GetForProfile(GetProfile());
 520   if (!(service && service->GetPreferredDataTypes().Has(syncer::SESSIONS))) {
 521     SetError(kSessionSyncError);
 522     return false;
 523   }
 524   browser_sync::OpenTabsUIDelegate* open_tabs =
 525       service->GetOpenTabsUIDelegate();
 526   if (!open_tabs) {
 527     SetError(kSessionSyncError);
 528     return false;
 529   }
 530
 531   const sessions::SessionTab* tab = NULL;
 532   if (open_tabs->GetForeignTab(session_id.session_tag(),
 533                                session_id.id(),
 534                                &tab)) {
 535     TabStripModel* tab_strip = browser->tab_strip_model();
 536     content::WebContents* contents = tab_strip->GetActiveWebContents();
 537
 538     content::WebContents* tab_contents =
 539         SessionRestore::RestoreForeignSessionTab(contents, *tab,
 540                                                  NEW_FOREGROUND_TAB);
 541     SetResultRestoredTab(tab_contents);
 542     return true;
 543   }
 544
 545   // Restoring a full window.
 546   std::vector<const sessions::SessionWindow*> windows;
 547   if (!open_tabs->GetForeignSession(session_id.session_tag(), &windows)) {
 548     SetInvalidIdError(session_id.ToString());
 549     return false;
 550   }
 551
 552   std::vector<const sessions::SessionWindow*>::const_iterator window =
 553       windows.begin();
 554   while (window != windows.end()
 555          && (*window)->window_id.id() != session_id.id()) {
 556     ++window;
 557   }
 558   if (window == windows.end()) {
 559     SetInvalidIdError(session_id.ToString());
 560     return false;
 561   }
 562
 563   chrome::HostDesktopType host_desktop_type = browser->host_desktop_type();
 564   // Only restore one window at a time.
 565   std::vector<Browser*> browsers = SessionRestore::RestoreForeignSessionWindows(
 566       GetProfile(), host_desktop_type, window, window + 1);
 567   // Will always create one browser because we only restore one window per call.
 568   DCHECK_EQ(1u, browsers.size());
 569   return SetResultRestoredWindow(ExtensionTabUtil::GetWindowId(browsers[0]));
 570 }
 571
 572 bool SessionsRestoreFunction::RunSync() {
 573   scoped_ptr<Restore::Params> params(Restore::Params::Create(*args_));
 574   EXTENSION_FUNCTION_VALIDATE(params);
 575
 576   Browser* browser = chrome::FindBrowserWithProfile(
 577       GetProfile(), chrome::HOST_DESKTOP_TYPE_NATIVE);
 578   if (!browser) {
 579     SetError(kNoBrowserToRestoreSession);
 580     return false;
 581   }
 582
 583   if (GetProfile() != GetProfile()->GetOriginalProfile()) {
 584     SetError(kRestoreInIncognitoError);
 585     return false;
 586   }
 587
 588   if (!params->session_id)
 589     return RestoreMostRecentlyClosed(browser);
 590
 591   scoped_ptr<SessionId> session_id(SessionId::Parse(*params->session_id));
 592   if (!session_id) {
 593     SetInvalidIdError(*params->session_id);
 594     return false;
 595   }
 596
 597   return session_id->IsForeign() ?
 598       RestoreForeignSession(*session_id, browser)
 599       : RestoreLocalSession(*session_id, browser);
 600 }
 601
 602 SessionsEventRouter::SessionsEventRouter(Profile* profile)
 603     : profile_(profile),
 604       tab_restore_service_(TabRestoreServiceFactory::GetForProfile(profile)) {
 605   // TabRestoreServiceFactory::GetForProfile() can return NULL (i.e., when in
 606   // incognito mode)
 607   if (tab_restore_service_) {
 608     tab_restore_service_->LoadTabsFromLastSession();
 609     tab_restore_service_->AddObserver(this);
 610   }
 611 }
 612
 613 SessionsEventRouter::~SessionsEventRouter() {
 614   if (tab_restore_service_)
 615     tab_restore_service_->RemoveObserver(this);
 616 }
 617
 618 void SessionsEventRouter::TabRestoreServiceChanged(
 619     TabRestoreService* service) {
 620   scoped_ptr<base::ListValue> args(new base::ListValue());
 621   EventRouter::Get(profile_)->BroadcastEvent(make_scoped_ptr(
 622       new Event(api::sessions::OnChanged::kEventName, args.Pass())));
 623 }
 624
 625 void SessionsEventRouter::TabRestoreServiceDestroyed(
 626     TabRestoreService* service) {
 627   tab_restore_service_ = NULL;
 628 }
 629
 630 SessionsAPI::SessionsAPI(content::BrowserContext* context)
 631     : browser_context_(context) {
 632   EventRouter::Get(browser_context_)->RegisterObserver(this,
 633       api::sessions::OnChanged::kEventName);
 634 }
 635
 636 SessionsAPI::~SessionsAPI() {
 637 }
 638
 639 void SessionsAPI::Shutdown() {
 640   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 641 }
 642
 643 static base::LazyInstance<BrowserContextKeyedAPIFactory<SessionsAPI> >
 644     g_factory = LAZY_INSTANCE_INITIALIZER;
 645
 646 BrowserContextKeyedAPIFactory<SessionsAPI>*
 647 SessionsAPI::GetFactoryInstance() {
 648   return g_factory.Pointer();
 649 }
 650
 651 void SessionsAPI::OnListenerAdded(const EventListenerInfo& details) {
 652   sessions_event_router_.reset(
 653       new SessionsEventRouter(Profile::FromBrowserContext(browser_context_)));
 654   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 655 }
 656
 657 }  // namespace extensions