Implements WebHistoryServiceFactory on iOS

ios/chrome/browser/history/web_history_service_factory.cc

+// Copyright 2015 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 "ios/chrome/browser/history/web_history_service_factory.h"
+
+#include "base/memory/singleton.h"
+#include "base/prefs/pref_service.h"
+#include "components/history/core/browser/web_history_service.h"
+#include "components/keyed_service/ios/browser_state_dependency_manager.h"
+#include "components/signin/core/browser/profile_oauth2_token_service.h"
+#include "components/signin/core/browser/signin_manager.h"
+#include "components/sync_driver/sync_service.h"
+#include "ios/public/provider/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/public/provider/chrome/browser/keyed_service_provider.h"
+#include "net/url_request/url_request_context_getter.h"
+
+namespace ios {
+namespace {
+
+// Returns true if the user is signed-in and full history sync is enabled,
+// false otherwise.
+bool IsHistorySyncEnabled(ios::ChromeBrowserState* browser_state) {
+  sync_driver::SyncService* sync_service =
+      GetKeyedServiceProvider()->GetSyncServiceForBrowserState(browser_state);
+  return sync_service && sync_service->IsSyncActive() &&
+         sync_service->GetActiveDataTypes().Has(
+             syncer::HISTORY_DELETE_DIRECTIVES);
+}
+
+}  // namespace
+
+// static
+history::WebHistoryService* WebHistoryServiceFactory::GetForBrowserState(
+    ios::ChromeBrowserState* browser_state) {
+  // Ensure that the service is not instantiated or used if the user is not
+  // signed into sync, or if web history is not enabled.
+  if (!IsHistorySyncEnabled(browser_state))
+    return nullptr;
+
+  return static_cast<history::WebHistoryService*>(
+      GetInstance()->GetServiceForBrowserState(browser_state, true));
+}
+
+// static
+WebHistoryServiceFactory* WebHistoryServiceFactory::GetInstance() {
+  return Singleton<WebHistoryServiceFactory>::get();
+}
+
+WebHistoryServiceFactory::WebHistoryServiceFactory()
+    : BrowserStateKeyedServiceFactory(
+          "WebHistoryService",
+          BrowserStateDependencyManager::GetInstance()) {
+  ios::KeyedServiceProvider* provider = ios::GetKeyedServiceProvider();
+  DependsOn(provider->GetSyncServiceFactory());
+  DependsOn(provider->GetProfileOAuth2TokenServiceFactory());
+  DependsOn(provider->GetSigninManagerFactory());
+}
+
+WebHistoryServiceFactory::~WebHistoryServiceFactory() {
+}
+
+scoped_ptr<KeyedService> WebHistoryServiceFactory::BuildServiceInstanceFor(
+    web::BrowserState* context) const {
+  ios::ChromeBrowserState* browser_state =
+      ios::ChromeBrowserState::FromBrowserState(context);
+  ios::KeyedServiceProvider* provider = ios::GetKeyedServiceProvider();
+  return make_scoped_ptr(new history::WebHistoryService(
+      provider->GetProfileOAuth2TokenServiceForBrowserState(browser_state),
+      provider->GetSigninManagerForBrowserState(browser_state),
+      browser_state->GetRequestContext()));
+}
+
+}  // namespace ios