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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_INTEREST_GROUP_INTEREST_GROUP_PMT_REPORT_UTIL_H_
#define CONTENT_BROWSER_INTEREST_GROUP_INTEREST_GROUP_PMT_REPORT_UTIL_H_
#include <optional>
#include <string>
#include "base/uuid.h"
#include "components/cbor/values.h"
#include "content/browser/interest_group/bidding_and_auction_server_key_fetcher.h"
#include "content/services/auction_worklet/public/mojom/bidder_worklet.mojom.h"
#include "url/origin.h"
namespace content {
// This class is meant to hold all the data necessary for building a request
// for the Private Model Training API.
class CONTENT_EXPORT PrivateModelTrainingRequest {
public:
static constexpr size_t kPublicKeyByteLength = X25519_PUBLIC_VALUE_LEN;
// Used as a prefix for the authenticated information (i.e. context info).
// This value must not be reused for new protocols or versions of this
// protocol unless the ciphertexts are intended to be compatible. This ensures
// that, even if public keys are reused, the same ciphertext cannot be (i.e.
// no cross-protocol attacks).
static constexpr std::string_view kDomainSeparationPrefix =
"private_model_training";
PrivateModelTrainingRequest(
auction_worklet::mojom::PrivateModelTrainingRequestDataPtr
pmt_request_data,
url::Origin reporting_origin,
BiddingAndAuctionServerKey public_key);
PrivateModelTrainingRequest(PrivateModelTrainingRequest&&);
PrivateModelTrainingRequest& operator=(PrivateModelTrainingRequest&&);
PrivateModelTrainingRequest(const PrivateModelTrainingRequest&) = delete;
PrivateModelTrainingRequest& operator=(const PrivateModelTrainingRequest&) =
delete;
~PrivateModelTrainingRequest();
static PrivateModelTrainingRequest CreateRequestForTesting(
auction_worklet::mojom::PrivateModelTrainingRequestDataPtr
pmt_request_data,
url::Origin reporting_origin,
BiddingAndAuctionServerKey public_key,
base::Uuid report_id,
base::Time scheduled_report_time);
// Handles serializing the entire request into CBOR.
std::optional<std::vector<uint8_t>> SerializeAndEncryptRequest();
// Returns shared info as CBOR prefixed with the `kDomainSeparationPrefix`.
std::optional<std::vector<uint8_t>> GetSharedInfoCborWithPrefix();
private:
PrivateModelTrainingRequest(
auction_worklet::mojom::PrivateModelTrainingRequestDataPtr
pmt_request_data,
url::Origin reporting_origin,
BiddingAndAuctionServerKey public_key,
base::Uuid report_id,
base::Time scheduled_report_time);
struct SharedInfo {
SharedInfo(base::Uuid report_id,
url::Origin reporting_origin,
base::Time scheduled_report_time);
~SharedInfo();
SharedInfo(const SharedInfo&);
SharedInfo(SharedInfo&&);
SharedInfo& operator=(const SharedInfo& other);
SharedInfo& operator=(SharedInfo&& other);
std::string api = "private-model-training";
std::string version = "1.0";
base::Uuid report_id;
url::Origin reporting_origin;
base::Time scheduled_report_time;
};
cbor::Value::MapValue GetSharedInfoCborMap();
SharedInfo shared_info_;
auction_worklet::mojom::PrivateModelTrainingRequestDataPtr pmt_request_data_;
BiddingAndAuctionServerKey public_key_;
};
} // namespace content
#endif // CONTENT_BROWSER_INTEREST_GROUP_INTEREST_GROUP_PMT_REPORT_UTIL_H_
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