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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.
#include "components/proximity_auth/remote_device_loader.h"
#include <utility>
#include "base/base64url.h"
#include "base/bind.h"
#include "components/proximity_auth/cryptauth/secure_message_delegate.h"
#include "components/proximity_auth/logging/logging.h"
#include "components/proximity_auth/proximity_auth_pref_manager.h"
namespace proximity_auth {
RemoteDeviceLoader::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)
: remaining_unlock_keys_(unlock_keys),
user_id_(user_id),
user_private_key_(user_private_key),
secure_message_delegate_(std::move(secure_message_delegate)),
pref_manager_(pref_manager),
weak_ptr_factory_(this) {}
RemoteDeviceLoader::~RemoteDeviceLoader() {}
void RemoteDeviceLoader::Load(const RemoteDeviceCallback& callback) {
DCHECK(callback_.is_null());
callback_ = callback;
PA_LOG(INFO) << "Loading " << remaining_unlock_keys_.size()
<< " remote devices";
if (remaining_unlock_keys_.empty()) {
callback_.Run(remote_devices_);
return;
}
std::vector<cryptauth::ExternalDeviceInfo> all_unlock_keys =
remaining_unlock_keys_;
for (const auto& unlock_key : all_unlock_keys) {
secure_message_delegate_->DeriveKey(
user_private_key_, unlock_key.public_key(),
base::Bind(&RemoteDeviceLoader::OnPSKDerived,
weak_ptr_factory_.GetWeakPtr(), unlock_key));
}
}
void RemoteDeviceLoader::OnPSKDerived(
const cryptauth::ExternalDeviceInfo& unlock_key,
const std::string& psk) {
std::string public_key = unlock_key.public_key();
auto iterator = std::find_if(
remaining_unlock_keys_.begin(), remaining_unlock_keys_.end(),
[&public_key](const cryptauth::ExternalDeviceInfo& unlock_key) {
return unlock_key.public_key() == public_key;
});
DCHECK(iterator != remaining_unlock_keys_.end());
remaining_unlock_keys_.erase(iterator);
PA_LOG(INFO) << "Derived PSK for " << unlock_key.friendly_device_name()
<< ", " << remaining_unlock_keys_.size() << " keys remaining.";
// TODO(tengs): We assume that devices without a |bluetooth_address| field are
// BLE devices. Ideally, we should have a separate field for this information.
RemoteDevice::BluetoothType bluetooth_type =
unlock_key.bluetooth_address().empty() ? RemoteDevice::BLUETOOTH_LE
: RemoteDevice::BLUETOOTH_CLASSIC;
std::string bluetooth_address = unlock_key.bluetooth_address();
if (bluetooth_address.empty() && pref_manager_) {
std::string b64_public_key;
base::Base64UrlEncode(unlock_key.public_key(),
base::Base64UrlEncodePolicy::INCLUDE_PADDING,
&b64_public_key);
bluetooth_address = pref_manager_->GetDeviceAddress(b64_public_key);
PA_LOG(INFO) << "The BLE address of " << unlock_key.friendly_device_name()
<< " is " << bluetooth_address;
}
remote_devices_.push_back(RemoteDevice(
user_id_, unlock_key.friendly_device_name(), unlock_key.public_key(),
bluetooth_type, bluetooth_address, psk, std::string()));
if (!remaining_unlock_keys_.size())
callback_.Run(remote_devices_);
}
} // namespace proximity_auth
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