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// Copyright 2020 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_FEDERATED_LEARNING_FLOC_ID_H_
#define COMPONENTS_FEDERATED_LEARNING_FLOC_ID_H_
#include "base/optional.h"
#include "base/time/time.h"
#include "base/version.h"
#include <stdint.h>
#include <string>
#include <unordered_set>
namespace federated_learning {
// ID used to represent a cohort of people with similar browsing habits. For
// more context, see the explainer at
// https://github.com/jkarlin/floc/blob/master/README.md
class FlocId {
public:
static uint64_t SimHashHistory(
const std::unordered_set<std::string>& domains);
FlocId();
explicit FlocId(uint64_t id,
base::Time history_begin_time,
base::Time history_end_time,
uint32_t sorting_lsh_version);
FlocId(const FlocId& id);
~FlocId();
FlocId& operator=(const FlocId& id);
FlocId& operator=(FlocId&& id);
bool operator==(const FlocId& other) const;
bool operator!=(const FlocId& other) const;
bool IsValid() const;
// The id, followed by the chrome floc version, followed by the async floc
// component versions (i.e. model and sorting-lsh). This is the format to be
// exposed to the JS API. Precondition: |id_| must be valid.
std::string ToStringForJsApi() const;
base::Time history_begin_time() const { return history_begin_time_; }
base::Time history_end_time() const { return history_end_time_; }
private:
base::Optional<uint64_t> id_;
// The time range of the actual history used to compute the floc. This should
// always be within the time range of each history query.
base::Time history_begin_time_;
base::Time history_end_time_;
// The main version (i.e. 1st int) of the sorting lsh component version.
uint32_t sorting_lsh_version_ = 0;
};
} // namespace federated_learning
#endif // COMPONENTS_FEDERATED_LEARNING_FLOC_ID_H_
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