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// Copyright 2021 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/sessions/session_data_service.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "chrome/browser/defaults.h"
#include "chrome/browser/lifetime/browser_shutdown.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/sessions/exit_type_service.h"
#include "chrome/browser/sessions/session_data_deleter.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/pref_service.h"
#include "storage/browser/quota/special_storage_policy.h"
namespace {
// Pref name for Status preference.
extern const char kSessionDataStatusPref[] = "sessions.session_data_status";
} // namespace
// static
void SessionDataService::RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterIntegerPref(kSessionDataStatusPref,
static_cast<int>(Status::kUninitialized));
}
SessionDataService::SessionDataService(
Profile* profile,
std::unique_ptr<SessionDataDeleter> deleter)
: profile_(profile), deleter_(std::move(deleter)) {
DCHECK(profile_);
DCHECK(!profile_->IsOffTheRecord());
DCHECK(deleter_);
Status last_status = static_cast<Status>(
profile_->GetPrefs()->GetInteger(kSessionDataStatusPref));
int int_status = static_cast<int>(last_status);
if (int_status < 0 || int_status > static_cast<int>(Status::kMaxValue))
last_status = Status::kUninitialized;
SetStatusPref(Status::kInitialized);
auto* policy = profile_->GetSpecialStoragePolicy();
if (policy && policy->HasSessionOnlyOrigins()) {
MaybeContinueDeletionFromLastSesssion(last_status);
}
for (Browser* browser : *BrowserList::GetInstance())
OnBrowserAdded(browser);
BrowserList::AddObserver(this);
}
SessionDataService::~SessionDataService() {
BrowserList::RemoveObserver(this);
}
void SessionDataService::MaybeContinueDeletionFromLastSesssion(
Status last_status) {
switch (last_status) {
case Status::kUninitialized:
case Status::kDeletionFinished:
case Status::kNoDeletionDueToForceKeepSessionData:
return; // No deletion needed.
case Status::kInitialized:
// Deletion did not happen on shutdown and we didn't even update the
// status preference. Check profile status:
switch (ExitTypeService::GetLastSessionExitType(profile_)) {
case ExitType::kCrashed:
// To allow the user to continue a session after a crash, we will not
// delete cookies.
return;
case ExitType::kClean:
case ExitType::kForcedShutdown:
// In case of a regular shutdown that skipped deletion, we should
// delete cookies.
break;
}
break;
case Status::kDeletionStarted:
case Status::kNoDeletionDueToShutdown:
break; // Deletion needed.
}
// Skip session cookie deletion as they already get cleared on startup.
// (SQLitePersistentCookieStore::Backend::DeleteSessionCookiesOnStartup)
deleter_->DeleteSessionOnlyData(
/*skip_session_cookies=*/true,
base::BindOnce(&SessionDataService::OnCleanupAtStartupFinished,
weak_factory_.GetWeakPtr()));
}
void SessionDataService::OnCleanupAtStartupFinished() {}
void SessionDataService::SetStatusPref(Status status) {
profile_->GetPrefs()->SetInteger(kSessionDataStatusPref,
static_cast<int>(status));
}
void SessionDataService::OnBrowserAdded(Browser* browser) {
if (browser->profile() != profile_)
return;
// A window was opened. Ensure that we run another cleanup the next time
// all windows are closed.
SetStatusPref(Status::kInitialized);
cleanup_started_ = false;
}
void SessionDataService::OnBrowserRemoved(Browser* browser) {
if (browser->profile() != profile_)
return;
// Check for any open windows for the current profile.
for (Browser* open_browser : *BrowserList::GetInstance()) {
if (open_browser->profile() == profile_)
return;
}
// Session cookies should stay alive on platforms where the browser stays
// alive without windows.
bool skip_session_cookies = browser_defaults::kBrowserAliveWithNoWindows;
// Clear session data if the last window for a profile has been closed.
StartCleanupInternal(skip_session_cookies);
}
void SessionDataService::StartCleanup() {
StartCleanupInternal(false);
}
void SessionDataService::StartCleanupInternal(bool skip_session_cookies) {
if (cleanup_started_)
return;
if (force_keep_session_state_)
return;
if (browser_shutdown::IsTryingToQuit()) {
SetStatusPref(Status::kNoDeletionDueToShutdown);
return;
}
cleanup_started_ = true;
SetStatusPref(Status::kDeletionStarted);
deleter_->DeleteSessionOnlyData(
skip_session_cookies,
base::BindOnce(&SessionDataService::OnCleanupAtSessionEndFinished,
weak_factory_.GetWeakPtr()));
}
void SessionDataService::OnCleanupAtSessionEndFinished() {
SetStatusPref(Status::kDeletionFinished);
}
void SessionDataService::SetForceKeepSessionState() {
SetStatusPref(Status::kNoDeletionDueToForceKeepSessionData);
force_keep_session_state_ = true;
}
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