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// Copyright 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/search/hotword_service.h"
#include "base/i18n/case_conversion.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/prefs/pref_service.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/extensions/extension_constants.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_service.h"
#include "extensions/browser/extension_system.h"
#include "extensions/common/extension.h"
#include "ui/base/l10n/l10n_util.h"
namespace {
const int kMaxTimesToShowOptInPopup = 10;
// Enum describing the state of the hotword preference.
// This is used for UMA stats -- do not reorder or delete items; only add to
// the end.
enum HotwordEnabled {
UNSET = 0, // The hotword preference has not been set.
ENABLED, // The hotword preference is enabled.
DISABLED, // The hotword preference is disabled.
NUM_HOTWORD_ENABLED_METRICS
};
// Enum describing the availability state of the hotword extension.
// This is used for UMA stats -- do not reorder or delete items; only add to
// the end.
enum HotwordExtensionAvailability {
UNAVAILABLE = 0,
AVAILABLE,
PENDING_DOWNLOAD,
DISABLED_EXTENSION,
NUM_HOTWORD_EXTENSION_AVAILABILITY_METRICS
};
void RecordAvailabilityMetrics(
ExtensionService* service,
const extensions::Extension* extension) {
HotwordExtensionAvailability availability_state = UNAVAILABLE;
if (extension) {
availability_state = AVAILABLE;
} else if (service->pending_extension_manager() &&
service->pending_extension_manager()->IsIdPending(
extension_misc::kHotwordExtensionId)) {
availability_state = PENDING_DOWNLOAD;
} else if (!service->IsExtensionEnabled(
extension_misc::kHotwordExtensionId)) {
availability_state = DISABLED_EXTENSION;
}
UMA_HISTOGRAM_ENUMERATION("Hotword.HotwordExtensionAvailability",
availability_state,
NUM_HOTWORD_EXTENSION_AVAILABILITY_METRICS);
}
void RecordLoggingMetrics(Profile* profile) {
// If the user is not opted in to hotword voice search, the audio logging
// metric is not valid so it is not recorded.
if (!profile->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled))
return;
UMA_HISTOGRAM_BOOLEAN(
"Hotword.HotwordAudioLogging",
profile->GetPrefs()->GetBoolean(prefs::kHotwordAudioLoggingEnabled));
}
ExtensionService* GetExtensionService(Profile* profile) {
CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
extensions::ExtensionSystem* extension_system =
extensions::ExtensionSystem::Get(profile);
if (extension_system)
return extension_system->extension_service();
return NULL;
}
} // namespace
namespace hotword_internal {
// Constants for the hotword field trial.
const char kHotwordFieldTrialName[] = "VoiceTrigger";
const char kHotwordFieldTrialDisabledGroupName[] = "Disabled";
} // namespace hotword_internal
// static
bool HotwordService::DoesHotwordSupportLanguage(Profile* profile) {
std::string locale =
#if defined(OS_CHROMEOS)
// On ChromeOS locale is per-profile.
profile->GetPrefs()->GetString(prefs::kApplicationLocale);
#else
g_browser_process->GetApplicationLocale();
#endif
// Only available for English now.
std::string normalized_locale = l10n_util::NormalizeLocale(locale);
return normalized_locale == "en" || normalized_locale == "en_us" ||
normalized_locale =="en_US";
}
HotwordService::HotwordService(Profile* profile)
: profile_(profile) {
// This will be called during profile initialization which is a good time
// to check the user's hotword state.
HotwordEnabled enabled_state = UNSET;
if (profile_->GetPrefs()->HasPrefPath(prefs::kHotwordSearchEnabled)) {
if (profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled))
enabled_state = ENABLED;
else
enabled_state = DISABLED;
} else {
// If the preference has not been set the hotword extension should
// not be running.
DisableHotwordExtension(GetExtensionService(profile_));
}
UMA_HISTOGRAM_ENUMERATION("Hotword.Enabled", enabled_state,
NUM_HOTWORD_ENABLED_METRICS);
pref_registrar_.Init(profile_->GetPrefs());
pref_registrar_.Add(
prefs::kHotwordSearchEnabled,
base::Bind(&HotwordService::OnHotwordSearchEnabledChanged,
base::Unretained(this)));
registrar_.Add(this,
chrome::NOTIFICATION_EXTENSION_INSTALLED,
content::Source<Profile>(profile_));
}
HotwordService::~HotwordService() {
}
void HotwordService::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
if (type == chrome::NOTIFICATION_EXTENSION_INSTALLED) {
const extensions::Extension* extension =
content::Details<const extensions::InstalledExtensionInfo>(details)
->extension;
if (extension->id() == extension_misc::kHotwordExtensionId &&
!profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled)) {
DisableHotwordExtension(GetExtensionService(profile_));
// Once the extension is disabled, it will not be enabled until the
// user opts in at which point the pref registrar will take over
// enabling and disabling.
registrar_.Remove(this,
chrome::NOTIFICATION_EXTENSION_INSTALLED,
content::Source<Profile>(profile_));
}
}
}
bool HotwordService::ShouldShowOptInPopup() {
if (profile_->IsOffTheRecord())
return false;
// Profile is not off the record.
if (profile_->GetPrefs()->HasPrefPath(prefs::kHotwordSearchEnabled))
return false; // Already opted in or opted out;
int number_shown = profile_->GetPrefs()->GetInteger(
prefs::kHotwordOptInPopupTimesShown);
return number_shown < MaxNumberTimesToShowOptInPopup();
}
int HotwordService::MaxNumberTimesToShowOptInPopup() {
return kMaxTimesToShowOptInPopup;
}
void HotwordService::ShowOptInPopup() {
int number_shown = profile_->GetPrefs()->GetInteger(
prefs::kHotwordOptInPopupTimesShown);
profile_->GetPrefs()->SetInteger(prefs::kHotwordOptInPopupTimesShown,
++number_shown);
// TODO(rlp): actually show opt in popup when linked up to extension.
}
bool HotwordService::IsServiceAvailable() {
extensions::ExtensionSystem* system =
extensions::ExtensionSystem::Get(profile_);
ExtensionService* service = system->extension_service();
// Include disabled extensions (true parameter) since it may not be enabled
// if the user opted out.
const extensions::Extension* extension =
service->GetExtensionById(extension_misc::kHotwordExtensionId, true);
RecordAvailabilityMetrics(service, extension);
RecordLoggingMetrics(profile_);
return extension && IsHotwordAllowed();
}
bool HotwordService::IsHotwordAllowed() {
std::string group = base::FieldTrialList::FindFullName(
hotword_internal::kHotwordFieldTrialName);
return !group.empty() &&
group != hotword_internal::kHotwordFieldTrialDisabledGroupName &&
DoesHotwordSupportLanguage(profile_);
}
bool HotwordService::RetryHotwordExtension() {
ExtensionService* extension_service = GetExtensionService(profile_);
if (!extension_service)
return false;
extension_service->ReloadExtension(extension_misc::kHotwordExtensionId);
return true;
}
void HotwordService::EnableHotwordExtension(
ExtensionService* extension_service) {
if (extension_service)
extension_service->EnableExtension(extension_misc::kHotwordExtensionId);
}
void HotwordService::DisableHotwordExtension(
ExtensionService* extension_service) {
if (extension_service) {
extension_service->DisableExtension(
extension_misc::kHotwordExtensionId,
extensions::Extension::DISABLE_USER_ACTION);
}
}
void HotwordService::OnHotwordSearchEnabledChanged(
const std::string& pref_name) {
DCHECK_EQ(pref_name, std::string(prefs::kHotwordSearchEnabled));
ExtensionService* extension_service = GetExtensionService(profile_);
if (profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled))
EnableHotwordExtension(extension_service);
else
DisableHotwordExtension(extension_service);
}
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