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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_IP_PROTECTION_ANDROID_IP_PROTECTION_TOKEN_IPC_FETCHER_H_
#define COMPONENTS_IP_PROTECTION_ANDROID_IP_PROTECTION_TOKEN_IPC_FETCHER_H_
#include <memory>
#include <optional>
#include <string>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "base/threading/sequence_bound.h"
#include "components/ip_protection/android/blind_sign_message_android_impl.h"
#include "components/ip_protection/common/ip_protection_data_types.h"
#include "components/ip_protection/common/ip_protection_token_fetcher.h"
#include "components/ip_protection/common/ip_protection_token_fetcher_helper.h"
#include "net/third_party/quiche/src/quiche/blind_sign_auth/blind_sign_auth_interface.h"
namespace ip_protection {
// An implementation of IpProtectionTokenFetcher that makes IPC calls to
// service implementing IP Protection in the `quiche::BlindSignAuth` library for
// retrieving blind-signed authentication tokens for IP Protection.
class IpProtectionTokenIpcFetcher : public IpProtectionTokenFetcher {
public:
// A delegate to support making requests.
class Delegate {
public:
virtual ~Delegate() = default;
// Checks if IP Protection is disabled via user settings.
virtual bool IsTokenFetchEnabled() = 0;
};
explicit IpProtectionTokenIpcFetcher(
Delegate* delegate,
std::unique_ptr<quiche::BlindSignAuthInterface>
blind_sign_auth_for_testing = nullptr);
~IpProtectionTokenIpcFetcher() override;
// IpProtectionTokenFetcher implementation:
void TryGetAuthTokens(uint32_t batch_size,
ProxyLayer proxy_layer,
TryGetAuthTokensCallback callback) override;
private:
void OnFetchBlindSignedTokenCompleted(
base::TimeTicks bsa_get_tokens_start_time,
TryGetAuthTokensCallback callback,
absl::StatusOr<std::vector<quiche::BlindSignToken>> tokens);
// Finish a call to `TryGetAuthTokens()` by recording the result and invoking
// its callback.
void TryGetAuthTokensComplete(
std::optional<std::vector<ip_protection::BlindSignedAuthToken>>
bsa_tokens,
TryGetAuthTokensCallback callback,
ip_protection::TryGetAuthTokensAndroidResult result,
std::optional<base::TimeDelta> duration = std::nullopt);
// Calculates the backoff time for the given result, based on
// `last_try_get_auth_tokens_..` fields, and updates those fields.
std::optional<base::TimeDelta> CalculateBackoff(
ip_protection::TryGetAuthTokensAndroidResult result);
raw_ptr<Delegate> delegate_;
// The result of the last call to `TryGetAuthTokens()`, and the
// backoff applied to `try_again_after`. `last_try_get_auth_tokens_backoff_`
// will be set to `base::TimeDelta::Max()` if no further attempts to get
// tokens should be made. These will be updated by calls from any receiver.
ip_protection::TryGetAuthTokensAndroidResult
last_try_get_auth_tokens_result_ =
ip_protection::TryGetAuthTokensAndroidResult::kSuccess;
std::optional<base::TimeDelta> last_try_get_auth_tokens_backoff_;
// The thread pool task runner on which BSA token generation takes place,
// isolating this CPU-intensive process from the UI thread.
scoped_refptr<base::SequencedTaskRunner> thread_pool_task_runner_;
// The helper, sequence-bound to `thread_pool_task_runner_`.
base::SequenceBound<ip_protection::IpProtectionTokenFetcherHelper> helper_;
// The BlindSignAuth implementation used to fetch blind-signed auth tokens.
std::unique_ptr<ip_protection::BlindSignMessageAndroidImpl>
blind_sign_message_android_impl_;
std::unique_ptr<quiche::BlindSignAuthInterface> blind_sign_auth_;
SEQUENCE_CHECKER(sequence_checker_);
// This must be the last member in this class.
base::WeakPtrFactory<IpProtectionTokenIpcFetcher> weak_ptr_factory_{this};
};
} // namespace ip_protection
#endif // COMPONENTS_IP_PROTECTION_ANDROID_IP_PROTECTION_TOKEN_IPC_FETCHER_H_
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