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// Copyright 2016 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 "components/search_engines/desktop_search_utils.h"
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/user_metrics.h"
#include "base/strings/string_util.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/pref_service.h"
#include "components/search_engines/prepopulated_engines.h"
#include "components/search_engines/template_url_prepopulate_data.h"
#include "components/search_engines/template_url_service.h"
#include "components/search_engines/util.h"
#include "net/base/url_util.h"
namespace {
// Values for the Search.DesktopSearch.URLAction histogram.
enum DesktopSearchURLAction {
DESKTOP_SEARCH_URL_ACTION_NO_REDIRECTION_FEATURE_DISABLED = 0,
DESKTOP_SEARCH_URL_ACTION_NO_REDIRECTION_DEFAULT_SEARCH_IS_BING = 1,
DESKTOP_SEARCH_URL_ACTION_NO_REDIRECTION_INVALID_SEARCH_ENGINE = 2,
DESKTOP_SEARCH_URL_ACTION_REDIRECTION = 3,
DESKTOP_SEARCH_URL_ACTION_MAX
};
void RecordDesktopSearchURLAction(DesktopSearchURLAction action) {
DCHECK_LT(action, DESKTOP_SEARCH_URL_ACTION_MAX);
UMA_HISTOGRAM_ENUMERATION("Search.DesktopSearch.URLAction", action,
DESKTOP_SEARCH_URL_ACTION_MAX);
}
// Detects whether a |url| comes from a desktop search. If so, puts the search
// terms in |search_terms| and returns true.
bool DetectDesktopSearch(const GURL& url,
const SearchTermsData& search_terms_data,
base::string16* search_terms) {
DCHECK(search_terms);
search_terms->clear();
scoped_ptr<TemplateURLData> template_url_data =
TemplateURLPrepopulateData::MakeTemplateURLDataFromPrepopulatedEngine(
TemplateURLPrepopulateData::bing);
TemplateURL template_url(*template_url_data);
if (!template_url.ExtractSearchTermsFromURL(url, search_terms_data,
search_terms))
return false;
// Query parameter that tells the source of a Bing search URL, and values
// associated with desktop search.
const char kBingSourceQueryKey[] = "form";
const char kBingSourceDesktopText[] = "WNSGPH";
const char kBingSourceDesktopVoice[] = "WNSBOX";
for (net::QueryIterator it(url); !it.IsAtEnd(); it.Advance()) {
// Use a case-insensitive comparison because the key is sometimes in capital
// letters.
if (base::EqualsCaseInsensitiveASCII(it.GetKey(), kBingSourceQueryKey)) {
const std::string source = it.GetValue();
if (source == kBingSourceDesktopText || source == kBingSourceDesktopVoice)
return true;
}
}
return false;
}
} // namespace
namespace prefs {
const char kDesktopSearchRedirectionInfobarShownPref[] =
"desktop_search_redirection_infobar_shown";
} // namespace prefs
const base::Feature kDesktopSearchRedirectionFeature{
"DesktopSearchRedirection", base::FEATURE_DISABLED_BY_DEFAULT};
void RegisterDesktopSearchRedirectionPref(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterBooleanPref(
prefs::kDesktopSearchRedirectionInfobarShownPref, false);
}
bool ReplaceDesktopSearchURLWithDefaultSearchURLIfNeeded(
const PrefService* pref_service,
TemplateURLService* template_url_service,
GURL* url) {
DCHECK(pref_service);
DCHECK(template_url_service);
DCHECK(url);
// Check if |url| is a desktop search.
base::string16 search_terms;
if (!DetectDesktopSearch(*url, template_url_service->search_terms_data(),
&search_terms))
return false;
// Record that the user searched from the desktop.
base::RecordAction(base::UserMetricsAction("DesktopSearch"));
// Check if the redirection feature is enabled.
if (!base::FeatureList::IsEnabled(kDesktopSearchRedirectionFeature)) {
RecordDesktopSearchURLAction(
DESKTOP_SEARCH_URL_ACTION_NO_REDIRECTION_FEATURE_DISABLED);
return false;
}
// Check if the default search engine is Bing.
const TemplateURL* default_search_engine =
template_url_service->GetDefaultSearchProvider();
if (default_search_engine &&
TemplateURLPrepopulateData::GetEngineType(
*default_search_engine, template_url_service->search_terms_data()) ==
SEARCH_ENGINE_BING) {
RecordDesktopSearchURLAction(
DESKTOP_SEARCH_URL_ACTION_NO_REDIRECTION_DEFAULT_SEARCH_IS_BING);
return false;
}
// Replace |url| by a default search engine URL.
GURL search_url(
GetDefaultSearchURLForSearchTerms(template_url_service, search_terms));
if (!search_url.is_valid()) {
RecordDesktopSearchURLAction(
DESKTOP_SEARCH_URL_ACTION_NO_REDIRECTION_INVALID_SEARCH_ENGINE);
return false;
}
RecordDesktopSearchURLAction(DESKTOP_SEARCH_URL_ACTION_REDIRECTION);
url->Swap(&search_url);
return !pref_service->GetBoolean(
prefs::kDesktopSearchRedirectionInfobarShownPref);
}
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