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// Copyright 2015 The Chromium Authors
// 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 <memory>
#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 "components/prefs/pref_service.h"
#include "components/safe_browsing/core/common/safe_browsing_prefs.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::NumberToString(static_cast<int>(type)));
base::Value::Dict& incidents_sent = GetPrefDict();
base::Value::Dict* type_dict = incidents_sent.EnsureDict(type_string);
type_dict->Set(key, base::NumberToString(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::NumberToString(static_cast<int>(type)));
const base::Value::Dict* const_type_dict =
store_->incidents_sent_->FindDict(type_string);
if (const_type_dict && const_type_dict->Find(key)) {
base::Value::Dict* type_dict = GetPrefDict().FindDict(type_string);
type_dict->Remove(key);
}
}
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::NumberToString(static_cast<int>(type)));
if (store_->incidents_sent_->FindDict(type_string))
GetPrefDict().Remove(type_string);
}
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::Value::Dict& StateStore::Transaction::GetPrefDict() {
if (!pref_update_) {
pref_update_ = std::make_unique<ScopedDictPrefUpdate>(
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(base::Value::Dict pref_dict) {
GetPrefDict() = std::move(pref_dict);
}
// 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.
incidents_sent_ =
&profile_->GetPrefs()->GetDict(prefs::kSafeBrowsingIncidentsSent);
// Apply the platform data.
Transaction transaction(this);
std::optional<base::Value::Dict> value_dict(
platform_state_store::Load(profile_));
if (value_dict.has_value()) {
if (value_dict->empty()) {
transaction.ClearAll();
} else if (!incidents_sent_ || *incidents_sent_ != value_dict.value()) {
transaction.ReplacePrefDict(std::move(value_dict.value()));
}
}
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::Value::Dict* type_dict =
incidents_sent_ ? incidents_sent_->FindDict(
base::NumberToString(static_cast<int>(type)))
: nullptr;
if (!type_dict)
return false;
const std::string* digest_string = type_dict->FindString(key);
return (digest_string && *digest_string == base::NumberToString(digest));
}
void StateStore::CleanLegacyValues(Transaction* transaction) {
static const IncidentType kLegacyTypes[] = {
IncidentType::OBSOLETE_BLOCKLIST_LOAD,
IncidentType::OBSOLETE_SUSPICIOUS_MODULE};
for (IncidentType type : kLegacyTypes)
transaction->ClearForType(type);
}
} // namespace safe_browsing
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