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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PROXIMITY_REMOTE_DEVICE_LOADER_H
#define COMPONENTS_PROXIMITY_REMOTE_DEVICE_LOADER_H
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "components/proximity_auth/cryptauth/proto/cryptauth_api.pb.h"
#include "components/proximity_auth/remote_device.h"
namespace proximity_auth {
class ProximityAuthPrefManager;
class SecureMessageDelegate;
// Loads a collection of RemoteDevice objects from the given ExternalDeviceInfo
// protos that were synced from CryptAuth. We need to derive the PSK, which is
// a symmetric key used to authenticate each remote device.
class RemoteDeviceLoader {
public:
// Creates the instance:
// |unlock_keys|: The unlock keys previously synced from CryptAuth.
// |user_private_key|: The private key of the user's local device. Used to
// derive the PSK.
// |secure_message_delegate|: Used to derive each persistent symmetric key.
// |pref_manager|: Used to retrieve the Bluetooth address of BLE devices.
RemoteDeviceLoader(
const std::vector<cryptauth::ExternalDeviceInfo>& unlock_keys,
const std::string& user_id,
const std::string& user_private_key,
scoped_ptr<SecureMessageDelegate> secure_message_delegate,
ProximityAuthPrefManager* pref_manager);
~RemoteDeviceLoader();
// Loads the RemoteDevice objects. |callback| will be invoked upon completion.
typedef base::Callback<void(const std::vector<RemoteDevice>&)>
RemoteDeviceCallback;
void Load(const RemoteDeviceCallback& callback);
private:
// Called when the PSK is derived for each unlock key. If the PSK for all
// unlock have been derived, then we can invoke |callback_|.
void OnPSKDerived(const cryptauth::ExternalDeviceInfo& unlock_key,
const std::string& psk);
// The remaining unlock keys whose PSK we're waiting on.
std::vector<cryptauth::ExternalDeviceInfo> remaining_unlock_keys_;
// The id of the user who the remote devices belong to.
const std::string user_id_;
// The private key of the user's local device.
const std::string user_private_key_;
// Performs the PSK key derivation.
scoped_ptr<SecureMessageDelegate> secure_message_delegate_;
// Used to retrieve the address for BLE devices. Not owned.
ProximityAuthPrefManager* pref_manager_;
// Invoked when the RemoteDevices are loaded.
RemoteDeviceCallback callback_;
// The collection of RemoteDevices to return.
std::vector<RemoteDevice> remote_devices_;
base::WeakPtrFactory<RemoteDeviceLoader> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(RemoteDeviceLoader);
};
} // namespace proximity_auth
#endif // COMPONENTS_PROXIMITY_REMOTE_DEVICE_LOADER_H
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