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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.
#include "components/federated_learning/floc_id.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "components/federated_learning/sim_hash.h"
namespace federated_learning {
namespace {
constexpr char kFlocVersion[] = "1.0.0";
// This is only for experimentation and won't be served to websites.
constexpr size_t kNumberOfBitsInFloc = 50;
static_assert(kNumberOfBitsInFloc > 0 &&
kNumberOfBitsInFloc <= std::numeric_limits<uint64_t>::digits,
"Number of bits in the floc id must be greater than 0 and no "
"greater than 64.");
} // namespace
// static
FlocId FlocId::CreateFromHistory(
const std::unordered_set<std::string>& domains) {
return FlocId(SimHashStrings(domains, kNumberOfBitsInFloc));
}
FlocId::FlocId() = default;
FlocId::FlocId(uint64_t id) : id_(id) {}
FlocId::FlocId(const FlocId& id) = default;
FlocId::~FlocId() = default;
FlocId& FlocId::operator=(const FlocId& id) = default;
FlocId& FlocId::operator=(FlocId&& id) = default;
bool FlocId::IsValid() const {
return id_.has_value();
}
uint64_t FlocId::ToUint64() const {
DCHECK(id_.has_value());
return id_.value();
}
std::string FlocId::ToDebugHeaderValue() const {
if (!id_.has_value())
return "null";
return ToHeaderValue();
}
std::string FlocId::ToHeaderValue() const {
DCHECK(id_.has_value());
return base::StrCat({base::NumberToString(id_.value()), ".", kFlocVersion});
}
} // namespace federated_learning
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