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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
#define CHROMEOS_ASH_COMPONENTS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
#include <stdint.h>
#include <optional>
#include <string>
#include <vector>
#include "base/component_export.h"
#include "base/functional/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "chromeos/ash/components/dbus/cryptohome/UserDataAuth.pb.h"
namespace ash {
// This class is used to get the system salt from cryptohome and cache it.
class COMPONENT_EXPORT(CHROMEOS_ASH_COMPONENTS_CRYPTOHOME) SystemSaltGetter {
public:
using GetSystemSaltCallback =
base::OnceCallback<void(const std::string& system_salt)>;
using RawSalt = std::vector<uint8_t>;
// Manage an explicitly initialized global instance.
static void Initialize();
static bool IsInitialized();
static void Shutdown();
static SystemSaltGetter* Get();
SystemSaltGetter(const SystemSaltGetter&) = delete;
SystemSaltGetter& operator=(const SystemSaltGetter&) = delete;
// Converts |salt| to a hex encoded string.
static std::string ConvertRawSaltToHexString(const RawSalt& salt);
// Returns system hash in hex encoded ascii format. Note: this may return
// an empty string (e.g. errors in D-Bus layer)
void GetSystemSalt(GetSystemSaltCallback callback);
// Adds another callback to be called when system salt is received.
// (If system salt is available, closure will be called immediately).
void AddOnSystemSaltReady(base::OnceClosure closure);
// Returns pointer to binary system salt if it is already known.
// Returns nullptr if system salt is not known.
// WARNING: This pointer is null early in startup. Do not assume it is valid.
// Prefer GetSystemSalt() above. https://crbug.com/1122674
const RawSalt* GetRawSalt() const;
// This is for browser tests API.
void SetRawSaltForTesting(const RawSalt& raw_salt);
protected:
SystemSaltGetter();
~SystemSaltGetter();
private:
// Used to implement GetSystemSalt().
void DidWaitForServiceToBeAvailable(GetSystemSaltCallback callback,
bool service_is_available);
void DidGetSystemSalt(
GetSystemSaltCallback system_salt_callback,
std::optional<::user_data_auth::GetSystemSaltReply> system_salt_reply);
RawSalt raw_salt_;
std::string system_salt_;
// List of callbacks waiting for system salt ready event.
std::vector<base::OnceClosure> on_system_salt_ready_;
base::WeakPtrFactory<SystemSaltGetter> weak_ptr_factory_{this};
};
} // namespace ash
#endif // CHROMEOS_ASH_COMPONENTS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
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