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// 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 "chrome/browser/safe_browsing/incident_reporting/state_store.h"
#include <utility>
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_number_conversions.h"
#include "base/values.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/safe_browsing/incident_reporting/incident.h"
#include "chrome/browser/safe_browsing/incident_reporting/platform_state_store.h"
#include "chrome/common/pref_names.h"
#include "components/prefs/pref_service.h"
namespace safe_browsing {
// StateStore::Transaction -----------------------------------------------------
StateStore::Transaction::Transaction(StateStore* store) : store_(store) {
#if DCHECK_IS_ON()
DCHECK(!store_->has_transaction_);
store_->has_transaction_ = true;
#endif
}
StateStore::Transaction::~Transaction() {
#if DCHECK_IS_ON()
store_->has_transaction_ = false;
#endif
if (pref_update_)
platform_state_store::Store(store_->profile_, store_->incidents_sent_);
}
void StateStore::Transaction::MarkAsReported(IncidentType type,
const std::string& key,
IncidentDigest digest) {
std::string type_string(base::IntToString(static_cast<int32_t>(type)));
base::DictionaryValue* incidents_sent = GetPrefDict();
base::DictionaryValue* type_dict = nullptr;
if (!incidents_sent->GetDictionaryWithoutPathExpansion(type_string,
&type_dict)) {
type_dict = new base::DictionaryValue();
incidents_sent->SetWithoutPathExpansion(type_string, type_dict);
}
type_dict->SetStringWithoutPathExpansion(key, base::UintToString(digest));
}
void StateStore::Transaction::Clear(IncidentType type, const std::string& key) {
// Nothing to do if the pref dict does not exist.
if (!store_->incidents_sent_)
return;
// Use the read-only view on the preference to figure out if there is a value
// to remove before committing to making a change since any use of GetPrefDict
// will result in a full serialize-and-write operation on the preferences
// store.
std::string type_string(base::IntToString(static_cast<int32_t>(type)));
const base::DictionaryValue* const_type_dict = nullptr;
if (store_->incidents_sent_->GetDictionaryWithoutPathExpansion(
type_string, &const_type_dict) &&
const_type_dict->GetWithoutPathExpansion(key, nullptr)) {
base::DictionaryValue* type_dict = nullptr;
GetPrefDict()->GetDictionaryWithoutPathExpansion(type_string, &type_dict);
type_dict->RemoveWithoutPathExpansion(key, nullptr);
}
}
void StateStore::Transaction::ClearForType(IncidentType type) {
// Nothing to do if the pref dict does not exist.
if (!store_->incidents_sent_)
return;
// Use the read-only view on the preference to figure out if there is a value
// to remove before committing to making a change since any use of GetPrefDict
// will result in a full serialize-and-write operation on the preferences
// store.
std::string type_string(base::IntToString(static_cast<int32_t>(type)));
const base::DictionaryValue* type_dict = nullptr;
if (store_->incidents_sent_->GetDictionaryWithoutPathExpansion(type_string,
&type_dict)) {
GetPrefDict()->RemoveWithoutPathExpansion(type_string, nullptr);
}
}
void StateStore::Transaction::ClearAll() {
// Clear the preference if it exists and contains any values.
if (store_->incidents_sent_ && !store_->incidents_sent_->empty())
GetPrefDict()->Clear();
}
base::DictionaryValue* StateStore::Transaction::GetPrefDict() {
if (!pref_update_) {
pref_update_.reset(new DictionaryPrefUpdate(
store_->profile_->GetPrefs(), prefs::kSafeBrowsingIncidentsSent));
// Getting the dict will cause it to be created if it doesn't exist.
// Unconditionally refresh the store's read-only view on the preference so
// that it will always be correct.
store_->incidents_sent_ = pref_update_->Get();
}
return pref_update_->Get();
}
void StateStore::Transaction::ReplacePrefDict(
std::unique_ptr<base::DictionaryValue> pref_dict) {
GetPrefDict()->Swap(pref_dict.get());
}
// StateStore ------------------------------------------------------------------
StateStore::StateStore(Profile* profile)
: profile_(profile),
incidents_sent_(nullptr)
#if DCHECK_IS_ON()
,
has_transaction_(false)
#endif
{
// Cache a read-only view of the preference.
const base::Value* value =
profile_->GetPrefs()->GetUserPrefValue(prefs::kSafeBrowsingIncidentsSent);
if (value)
value->GetAsDictionary(&incidents_sent_);
// Apply the platform data.
Transaction transaction(this);
std::unique_ptr<base::DictionaryValue> value_dict(
platform_state_store::Load(profile_));
InitializationResult state_store_init_result = PSS_MATCHES;
if (!value_dict) {
state_store_init_result = PSS_NULL;
} else if (value_dict->empty()) {
if (incidents_sent_ && !incidents_sent_->empty())
state_store_init_result = PSS_EMPTY;
transaction.ClearAll();
} else if (!incidents_sent_ || !incidents_sent_->Equals(value_dict.get())) {
state_store_init_result = PSS_DIFFERS;
transaction.ReplacePrefDict(std::move(value_dict));
}
UMA_HISTOGRAM_ENUMERATION("SBIRS.StateStoreInit", state_store_init_result,
NUM_INITIALIZATION_RESULTS);
if (incidents_sent_)
CleanLegacyValues(&transaction);
}
StateStore::~StateStore() {
#if DCHECK_IS_ON()
DCHECK(!has_transaction_);
#endif
}
bool StateStore::HasBeenReported(IncidentType type,
const std::string& key,
IncidentDigest digest) {
const base::DictionaryValue* type_dict = nullptr;
std::string digest_string;
return (incidents_sent_ &&
incidents_sent_->GetDictionaryWithoutPathExpansion(
base::IntToString(static_cast<int32_t>(type)), &type_dict) &&
type_dict->GetStringWithoutPathExpansion(key, &digest_string) &&
digest_string == base::UintToString(digest));
}
void StateStore::CleanLegacyValues(Transaction* transaction) {
static const IncidentType kLegacyTypes[] = {
// TODO(grt): remove in M44 (crbug.com/451173).
IncidentType::OMNIBOX_INTERACTION,
};
for (IncidentType type : kLegacyTypes)
transaction->ClearForType(type);
}
} // namespace safe_browsing
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