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// Copyright 2019 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/net/dns_util.h"
#include <algorithm>
#include <string>
#include "base/feature_list.h"
#include "base/strings/string_split.h"
#include "chrome/common/chrome_features.h"
#include "components/embedder_support/pref_names.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
#include "net/dns/public/util.h"
#include "net/third_party/uri_template/uri_template.h"
#include "url/gurl.h"
namespace chrome_browser_net {
namespace {
const char kAlternateErrorPagesBackup[] = "alternate_error_pages.backup";
} // namespace
void RegisterDNSProbesSettingBackupPref(PrefRegistrySimple* registry) {
registry->RegisterBooleanPref(kAlternateErrorPagesBackup, true);
}
void MigrateDNSProbesSettingToOrFromBackup(PrefService* prefs) {
// If the privacy settings redesign is enabled and the user value of the
// preference hasn't been backed up yet, back it up, and clear it. That way,
// the preference will revert to using the hardcoded default value (unless
// it's managed by a policy or an extension). This is necessary, as the
// privacy settings redesign removed the user-facing toggle, and so the
// user value of the preference is no longer modifiable.
if (base::FeatureList::IsEnabled(features::kPrivacySettingsRedesign) &&
!prefs->HasPrefPath(kAlternateErrorPagesBackup)) {
// If the user never changed the value of the preference and still uses the
// hardcoded default value, we'll consider it to be the user value for
// the purposes of this migration.
const base::Value* user_value =
prefs->FindPreference(embedder_support::kAlternateErrorPagesEnabled)
->HasUserSetting()
? prefs->GetUserPrefValue(
embedder_support::kAlternateErrorPagesEnabled)
: prefs->GetDefaultPrefValue(
embedder_support::kAlternateErrorPagesEnabled);
DCHECK(user_value->is_bool());
prefs->SetBoolean(kAlternateErrorPagesBackup, user_value->GetBool());
prefs->ClearPref(embedder_support::kAlternateErrorPagesEnabled);
}
// If the privacy settings redesign is rolled back and there is a backed up
// value of the preference, restore it to the original preference, and clear
// the backup.
if (!base::FeatureList::IsEnabled(features::kPrivacySettingsRedesign) &&
prefs->HasPrefPath(kAlternateErrorPagesBackup)) {
prefs->SetBoolean(embedder_support::kAlternateErrorPagesEnabled,
prefs->GetBoolean(kAlternateErrorPagesBackup));
prefs->ClearPref(kAlternateErrorPagesBackup);
}
}
std::vector<base::StringPiece> SplitDohTemplateGroup(base::StringPiece group) {
// Templates in a group are whitespace-separated.
return SplitStringPiece(group, " ", base::TRIM_WHITESPACE,
base::SPLIT_WANT_NONEMPTY);
}
bool IsValidDohTemplateGroup(base::StringPiece group) {
// All templates must be valid for the group to be considered valid.
std::vector<base::StringPiece> templates = SplitDohTemplateGroup(group);
return std::all_of(templates.begin(), templates.end(), [](auto t) {
std::string method;
return net::dns_util::IsValidDohTemplate(t, &method);
});
}
} // namespace chrome_browser_net
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