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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/unexportable_keys/unexportable_key_loader.h"
#include <memory>
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ref.h"
#include "base/memory/weak_ptr.h"
#include "components/unexportable_keys/background_task_priority.h"
#include "components/unexportable_keys/service_error.h"
#include "components/unexportable_keys/unexportable_key_id.h"
#include "components/unexportable_keys/unexportable_key_service.h"
#include "crypto/signature_verifier.h"
namespace unexportable_keys {
// static
std::unique_ptr<UnexportableKeyLoader>
UnexportableKeyLoader::CreateFromWrappedKey(
UnexportableKeyService& unexportable_key_service,
base::span<const uint8_t> wrapped_key,
BackgroundTaskPriority priority) {
std::unique_ptr<UnexportableKeyLoader> loader =
base::WrapUnique(new UnexportableKeyLoader());
loader->LoadFromWrappedKey(unexportable_key_service, wrapped_key, priority);
return loader;
}
// static
std::unique_ptr<UnexportableKeyLoader> UnexportableKeyLoader::CreateWithNewKey(
UnexportableKeyService& unexportable_key_service,
base::span<const crypto::SignatureVerifier::SignatureAlgorithm>
acceptable_algorithms,
BackgroundTaskPriority priority) {
std::unique_ptr<UnexportableKeyLoader> loader =
base::WrapUnique(new UnexportableKeyLoader());
loader->GenerateNewKey(unexportable_key_service, acceptable_algorithms,
priority);
return loader;
}
UnexportableKeyLoader::~UnexportableKeyLoader() = default;
void UnexportableKeyLoader::InvokeCallbackAfterKeyLoaded(
base::OnceCallback<void(ServiceErrorOr<UnexportableKeyId>)> callback) {
if (state_ == State::kReady) {
// The key is ready, we can invoke the callback immediately.
std::move(callback).Run(key_id_or_error_);
return;
}
CHECK_EQ(state_, State::kLoading);
on_load_callbacks_.push_back(std::move(callback));
}
ServiceErrorOr<UnexportableKeyId> UnexportableKeyLoader::GetKeyIdOrError() {
return key_id_or_error_;
}
UnexportableKeyLoader::State UnexportableKeyLoader::GetStateForTesting() {
return state_;
}
UnexportableKeyLoader::UnexportableKeyLoader() = default;
void UnexportableKeyLoader::LoadFromWrappedKey(
UnexportableKeyService& unexportable_key_service,
base::span<const uint8_t> wrapped_key,
BackgroundTaskPriority priority) {
CHECK_EQ(state_, State::kNotStarted);
state_ = State::kLoading;
unexportable_key_service.FromWrappedSigningKeySlowlyAsync(
wrapped_key, priority,
base::BindOnce(&UnexportableKeyLoader::OnKeyLoaded,
weak_ptr_factory_.GetWeakPtr()));
}
void UnexportableKeyLoader::GenerateNewKey(
UnexportableKeyService& unexportable_key_service,
base::span<const crypto::SignatureVerifier::SignatureAlgorithm>
acceptable_algorithms,
BackgroundTaskPriority priority) {
CHECK_EQ(state_, State::kNotStarted);
state_ = State::kLoading;
unexportable_key_service.GenerateSigningKeySlowlyAsync(
acceptable_algorithms, priority,
base::BindOnce(&UnexportableKeyLoader::OnKeyLoaded,
weak_ptr_factory_.GetWeakPtr()));
}
void UnexportableKeyLoader::OnKeyLoaded(
ServiceErrorOr<UnexportableKeyId> key_id_or_error) {
CHECK_EQ(state_, State::kLoading);
state_ = State::kReady;
key_id_or_error_ = key_id_or_error;
std::vector<base::OnceCallback<void(ServiceErrorOr<UnexportableKeyId>)>>
callbacks;
callbacks.swap(on_load_callbacks_);
// `this` may be destroyed after invoking a callback.
for (auto& callback : callbacks) {
std::move(callback).Run(key_id_or_error);
}
}
} // namespace unexportable_keys
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