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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.
#ifndef COMPONENTS_ATTRIBUTION_REPORTING_EVENT_LEVEL_EPSILON_H_
#define COMPONENTS_ATTRIBUTION_REPORTING_EVENT_LEVEL_EPSILON_H_
#include "base/component_export.h"
#include "base/types/expected.h"
#include "components/attribution_reporting/source_registration_error.mojom-forward.h"
namespace base {
class DictValue;
} // namespace base
namespace attribution_reporting {
// Controls the epsilon parameter used for obtaining a randomized response for
// the containing source registration.
//
// https://wicg.github.io/attribution-reporting-api/#obtain-a-randomized-source-response
class COMPONENT_EXPORT(ATTRIBUTION_REPORTING) EventLevelEpsilon {
public:
static base::expected<EventLevelEpsilon, mojom::SourceRegistrationError>
Parse(const base::DictValue&);
// Creates an epsilon with the maximum allowed value.
EventLevelEpsilon();
// `CHECK()`s that the given value is non-negative and less than the maximum.
explicit EventLevelEpsilon(double);
~EventLevelEpsilon() = default;
EventLevelEpsilon(const EventLevelEpsilon&) = default;
EventLevelEpsilon& operator=(const EventLevelEpsilon&) = default;
EventLevelEpsilon(EventLevelEpsilon&&) = default;
EventLevelEpsilon& operator=(EventLevelEpsilon&&) = default;
// This implicit conversion is allowed to ease drop-in use of
// this type in places currently requiring `int` with prior validation.
operator double() const { // NOLINT
return epsilon_;
}
[[nodiscard]] bool SetIfValid(double);
void Serialize(base::DictValue&) const;
private:
double epsilon_;
};
class COMPONENT_EXPORT(ATTRIBUTION_REPORTING)
ScopedMaxEventLevelEpsilonForTesting {
public:
explicit ScopedMaxEventLevelEpsilonForTesting(double);
~ScopedMaxEventLevelEpsilonForTesting();
ScopedMaxEventLevelEpsilonForTesting(
const ScopedMaxEventLevelEpsilonForTesting&) = delete;
ScopedMaxEventLevelEpsilonForTesting& operator=(
const ScopedMaxEventLevelEpsilonForTesting&) = delete;
ScopedMaxEventLevelEpsilonForTesting(ScopedMaxEventLevelEpsilonForTesting&&) =
delete;
ScopedMaxEventLevelEpsilonForTesting& operator=(
ScopedMaxEventLevelEpsilonForTesting&&) = delete;
private:
double previous_;
};
} // namespace attribution_reporting
#endif // COMPONENTS_ATTRIBUTION_REPORTING_EVENT_LEVEL_EPSILON_H_
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