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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/media_device_salt/media_device_salt_database.h"
#include <vector>
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/time/time.h"
#include "sql/meta_table.h"
#include "sql/recovery.h"
#include "sql/statement.h"
#include "sql/transaction.h"
#include "third_party/blink/public/common/storage_key/storage_key.h"
namespace media_device_salt {
namespace {
// The current version of the database schema.
constexpr int kCurrentVersion = 1;
// The lowest version of the database schema such that old versions of the code
// can still read/write the current database.
constexpr int kCompatibleVersion = 1;
} // namespace
std::string CreateRandomSalt() {
return base::UnguessableToken::Create().ToString();
}
MediaDeviceSaltDatabase::MediaDeviceSaltDatabase(const base::FilePath& db_path)
: db_path_(db_path),
db_(sql::DatabaseOptions().set_cache_size(16),
/*tag=*/"MediaDeviceSalts") {}
std::optional<std::string> MediaDeviceSaltDatabase::GetOrInsertSalt(
const blink::StorageKey& storage_key,
std::optional<std::string> candidate_salt) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (storage_key.origin().opaque() || !EnsureOpen()) {
return std::nullopt;
}
sql::Transaction transaction(&db_);
if (!transaction.Begin()) {
return std::nullopt;
}
static constexpr char kGetSaltSql[] =
"SELECT salt FROM media_device_salts WHERE storage_key=?";
DCHECK(db_.IsSQLValid(kGetSaltSql));
sql::Statement select_statement(
db_.GetCachedStatement(SQL_FROM_HERE, kGetSaltSql));
select_statement.BindString(0, storage_key.Serialize());
if (select_statement.Step()) {
return select_statement.ColumnString(0);
}
if (!select_statement.Succeeded()) {
return std::nullopt;
}
static constexpr char kInsertSaltSql[] =
"INSERT INTO media_device_salts(storage_key,creation_time,salt) "
"VALUES(?,?,?)";
DCHECK(db_.IsSQLValid(kInsertSaltSql));
sql::Statement insert_statement(
db_.GetCachedStatement(SQL_FROM_HERE, kInsertSaltSql));
insert_statement.BindString(0, storage_key.Serialize());
insert_statement.BindTime(1, base::Time::Now());
std::string new_salt = candidate_salt.value_or(CreateRandomSalt());
insert_statement.BindString(2, new_salt);
return insert_statement.Run() && transaction.Commit()
? std::make_optional(new_salt)
: std::nullopt;
}
void MediaDeviceSaltDatabase::DeleteEntries(
base::Time delete_begin,
base::Time delete_end,
content::StoragePartition::StorageKeyMatcherFunction matcher) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!EnsureOpen()) {
return;
}
if (matcher.is_null()) {
static constexpr char kDeleteSaltsSql[] =
"DELETE FROM media_device_salts "
"WHERE creation_time>=? AND creation_time<=?";
DCHECK(db_.IsSQLValid(kDeleteSaltsSql));
sql::Statement statement(db_.GetUniqueStatement(kDeleteSaltsSql));
statement.BindTime(0, delete_begin);
statement.BindTime(1, delete_end);
statement.Run();
return;
}
sql::Transaction transaction(&db_);
if (!transaction.Begin()) {
return;
}
static constexpr char kGetStorageKeysSql[] =
"SELECT storage_key "
"FROM media_device_salts "
"WHERE creation_time>=? AND creation_time<=?";
DCHECK(db_.IsSQLValid(kGetStorageKeysSql));
sql::Statement select_statement(db_.GetUniqueStatement(kGetStorageKeysSql));
select_statement.BindTime(0, delete_begin);
select_statement.BindTime(1, delete_end);
std::vector<std::string> serialized_storage_keys;
while (select_statement.Step()) {
serialized_storage_keys.push_back(select_statement.ColumnString(0));
}
std::erase_if(serialized_storage_keys,
[&matcher](const std::string& serialized_storage_key) {
std::optional<blink::StorageKey> storage_key =
blink::StorageKey::Deserialize(serialized_storage_key);
if (!storage_key.has_value()) {
// This shouldn't happen, but include non-Deserializable
// keys for deletion if they're found.
return false;
}
return !matcher.Run(*storage_key);
});
if (serialized_storage_keys.empty()) {
return;
}
const std::string delete_storage_keys_sql =
base::StrCat({"DELETE FROM media_device_salts "
"WHERE storage_key IN ('",
base::JoinString(serialized_storage_keys, "','"), "')"});
DCHECK(db_.IsSQLValid(delete_storage_keys_sql));
sql::Statement delete_statement(
db_.GetUniqueStatement(delete_storage_keys_sql));
delete_statement.Run() && transaction.Commit();
}
void MediaDeviceSaltDatabase::DeleteEntry(
const blink::StorageKey& storage_key) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (storage_key.origin().opaque() || !EnsureOpen()) {
return;
}
static constexpr char kDeleteStorageKeySql[] =
"DELETE FROM media_device_salts "
"WHERE storage_key=?";
DCHECK(db_.IsSQLValid(kDeleteStorageKeySql));
sql::Statement statement(db_.GetUniqueStatement(kDeleteStorageKeySql));
statement.BindString(0, storage_key.Serialize());
statement.Run();
}
std::vector<blink::StorageKey> MediaDeviceSaltDatabase::GetAllStorageKeys() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!EnsureOpen()) {
return {};
}
std::vector<blink::StorageKey> storage_keys;
static constexpr char kGetStorageKeysSql[] =
"SELECT storage_key FROM media_device_salts";
DCHECK(db_.IsSQLValid(kGetStorageKeysSql));
sql::Statement statement(db_.GetUniqueStatement(kGetStorageKeysSql));
while (statement.Step()) {
std::optional<blink::StorageKey> key =
blink::StorageKey::Deserialize(statement.ColumnStringView(0));
if (key.has_value()) {
storage_keys.push_back(*key);
}
}
return storage_keys;
}
bool MediaDeviceSaltDatabase::EnsureOpen(bool is_retry) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (db_.is_open()) {
return true;
}
if (force_error_) {
return false;
}
// base::Unretained() is safe here because `this` owns `db`.
db_.set_error_callback(base::BindRepeating(
&MediaDeviceSaltDatabase::OnDatabaseError, base::Unretained(this)));
if (db_path_.empty()) {
if (!db_.OpenInMemory()) {
return false;
}
} else if (!db_.Open(db_path_)) {
return false;
}
sql::Transaction transaction(&db_);
if (transaction.Begin()) {
sql::MetaTable metatable;
if (metatable.Init(&db_, kCurrentVersion, kCompatibleVersion) &&
metatable.GetCompatibleVersionNumber() <= kCurrentVersion &&
db_.Execute("CREATE TABLE IF NOT EXISTS media_device_salts("
" storage_key TEXT PRIMARY KEY NOT NULL,"
" creation_time INTEGER NOT NULL,"
" salt TEXT NOT NULL)") &&
db_.Execute("CREATE INDEX IF NOT EXISTS creation_time ON "
"media_device_salts(creation_time)") &&
transaction.Commit()) {
return true;
}
transaction.Rollback();
}
db_.Raze();
return is_retry ? false : EnsureOpen(/*is_retry=*/true);
}
void MediaDeviceSaltDatabase::OnDatabaseError(int error,
sql::Statement* statement) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
sql::UmaHistogramSqliteResult("Media.MediaDevices.SaltDatabaseErrors", error);
std::ignore = sql::Recovery::RecoverIfPossible(
&db_, error, sql::Recovery::Strategy::kRecoverWithMetaVersionOrRaze);
}
} // namespace media_device_salt
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