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      1 // Copyright (c) 2012 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/history/web_history_service_factory.h"
      6 
      7 #include "base/command_line.h"
      8 #include "chrome/browser/content_settings/cookie_settings.h"
      9 #include "chrome/browser/history/web_history_service.h"
     10 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
     11 #include "chrome/browser/sync/profile_sync_service.h"
     12 #include "chrome/browser/sync/profile_sync_service_factory.h"
     13 #include "components/keyed_service/content/browser_context_dependency_manager.h"
     14 
     15 namespace {
     16 // Returns true if the user is signed in and full history sync is enabled,
     17 // and false otherwise.
     18 bool IsHistorySyncEnabled(Profile* profile) {
     19   ProfileSyncService* sync =
     20       ProfileSyncServiceFactory::GetInstance()->GetForProfile(profile);
     21   return sync &&
     22       sync->sync_initialized() &&
     23       sync->GetActiveDataTypes().Has(syncer::HISTORY_DELETE_DIRECTIVES);
     24 }
     25 
     26 }  // namespace
     27 
     28 // static
     29 WebHistoryServiceFactory* WebHistoryServiceFactory::GetInstance() {
     30   return Singleton<WebHistoryServiceFactory>::get();
     31 }
     32 
     33 // static
     34 history::WebHistoryService* WebHistoryServiceFactory::GetForProfile(
     35       Profile* profile) {
     36   if (IsHistorySyncEnabled(profile)) {
     37     return static_cast<history::WebHistoryService*>(
     38         GetInstance()->GetServiceForBrowserContext(profile, true));
     39   }
     40   return NULL;
     41 }
     42 
     43 KeyedService* WebHistoryServiceFactory::BuildServiceInstanceFor(
     44     content::BrowserContext* context) const {
     45   Profile* profile = static_cast<Profile*>(context);
     46 
     47   // Ensure that the service is not instantiated or used if the user is not
     48   // signed into sync, or if web history is not enabled.
     49   return IsHistorySyncEnabled(profile) ?
     50       new history::WebHistoryService(profile) : NULL;
     51 }
     52 
     53 WebHistoryServiceFactory::WebHistoryServiceFactory()
     54     : BrowserContextKeyedServiceFactory(
     55         "WebHistoryServiceFactory",
     56         BrowserContextDependencyManager::GetInstance()) {
     57   DependsOn(CookieSettings::Factory::GetInstance());
     58   DependsOn(ProfileOAuth2TokenServiceFactory::GetInstance());
     59 }
     60 
     61 WebHistoryServiceFactory::~WebHistoryServiceFactory() {
     62 }
     63