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// Copyright 2016 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/downgrade/user_data_downgrade.h"
#include <string>
#include "base/check.h"
#include "base/files/file_enumerator.h"
#include "base/files/file_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/downgrade/snapshot_manager.h"
#include "chrome/common/pref_names.h"
#include "components/prefs/pref_service.h"
namespace downgrade {
namespace {
base::Version GetVersionFromFileName(const base::FilePath& path) {
#if BUILDFLAG(IS_WIN)
// On Windows, for Unicode-aware applications, native pathnames are wchar_t
// arrays encoded in UTF-16.
return base::Version(base::WideToUTF8(path.BaseName().value()));
#elif BUILDFLAG(IS_POSIX)
// On most platforms, native pathnames are char arrays, and the encoding
// may or may not be specified. On Mac OS X, native pathnames are encoded
// in UTF-8.
return base::Version(path.BaseName().value());
#endif // BUILDFLAG(IS_WIN)
}
bool IsValidSnapshotDirectory(const base::FilePath& path) {
base::Version snapshot_version = GetVersionFromFileName(path);
return snapshot_version.IsValid() &&
base::PathExists(path.Append(kDowngradeLastVersionFile));
}
} // namespace
const base::FilePath::StringViewType kDowngradeLastVersionFile(
FILE_PATH_LITERAL("Last Version"));
const base::FilePath::StringViewType kDowngradeDeleteSuffix(
FILE_PATH_LITERAL(".CHROME_DELETE"));
const base::FilePath::StringViewType kSnapshotsDir(
FILE_PATH_LITERAL("Snapshots"));
base::FilePath GetLastVersionFile(const base::FilePath& user_data_dir) {
DCHECK(!user_data_dir.empty());
return user_data_dir.Append(kDowngradeLastVersionFile);
}
std::optional<base::Version> GetLastVersion(
const base::FilePath& user_data_dir) {
DCHECK(!user_data_dir.empty());
std::string last_version_str;
if (base::ReadFileToString(GetLastVersionFile(user_data_dir),
&last_version_str)) {
base::Version version(
base::TrimWhitespaceASCII(last_version_str, base::TRIM_ALL));
if (version.IsValid())
return version;
}
return std::nullopt;
}
base::FilePath GetDiskCacheDir() {
base::FilePath disk_cache_dir =
g_browser_process->local_state()->GetFilePath(prefs::kDiskCacheDir);
if (disk_cache_dir.ReferencesParent())
return base::MakeAbsoluteFilePath(disk_cache_dir);
return disk_cache_dir;
}
base::flat_set<base::Version> GetAvailableSnapshots(
const base::FilePath& snapshot_dir) {
std::vector<base::Version> result;
base::FileEnumerator enumerator(snapshot_dir, false,
base::FileEnumerator::DIRECTORIES);
for (base::FilePath path = enumerator.Next(); !path.empty();
path = enumerator.Next()) {
base::Version snapshot_version = GetVersionFromFileName(path);
if (!snapshot_version.IsValid() ||
!base::PathExists(path.Append(kDowngradeLastVersionFile))) {
continue;
}
result.push_back(std::move(snapshot_version));
}
return base::flat_set<base::Version>(std::move(result));
}
std::vector<base::FilePath> GetInvalidSnapshots(
const base::FilePath& snapshot_dir) {
std::vector<base::FilePath> result;
base::FileEnumerator enumerator(snapshot_dir, false,
base::FileEnumerator::DIRECTORIES);
for (base::FilePath path = enumerator.Next(); !path.empty();
path = enumerator.Next()) {
if (!IsValidSnapshotDirectory(path))
result.push_back(std::move(path));
}
return result;
}
std::optional<base::Version> GetSnapshotToRestore(
const base::Version& version,
const base::FilePath& user_data_dir) {
DCHECK(version.IsValid());
base::FilePath top_snapshot_dir = user_data_dir.Append(kSnapshotsDir);
auto available_snapshots = GetAvailableSnapshots(top_snapshot_dir);
auto upper_bound = available_snapshots.upper_bound(version);
if (upper_bound != available_snapshots.begin())
return *--upper_bound;
return std::nullopt;
}
void RemoveDataForProfile(base::Time delete_begin,
const base::FilePath& profile_path,
uint64_t remove_mask) {
SnapshotManager snapshot_manager(profile_path.DirName());
snapshot_manager.DeleteSnapshotDataForProfile(
delete_begin, profile_path.BaseName(), remove_mask);
}
} // namespace downgrade
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