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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 CONTENT_BROWSER_CONVERSIONS_CONVERSION_POLICY_H_
#define CONTENT_BROWSER_CONVERSIONS_CONVERSION_POLICY_H_
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include "base/optional.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
namespace content {
// Class for controlling certain constraints and configurations for handling,
// storing, and sending impressions and conversions.
class CONTENT_EXPORT ConversionPolicy {
public:
// Helper class that generates noised conversion data. Can be overridden to
// make testing deterministic.
class CONTENT_EXPORT NoiseProvider {
public:
NoiseProvider() = default;
virtual ~NoiseProvider() = default;
// Returns a noise value of |conversion_data|. By default, this reports
// completely random data for 5% of conversions, and sends the real data for
// 95%. Virtual for testing.
virtual uint64_t GetNoisedConversionData(uint64_t conversion_data) const;
};
static std::unique_ptr<ConversionPolicy> CreateForTesting(
std::unique_ptr<NoiseProvider> noise_provider);
// |debug_mode| indicates whether the API is currently running in a mode where
// it should not use noise.
explicit ConversionPolicy(bool debug_mode = false);
ConversionPolicy(const ConversionPolicy& other) = delete;
ConversionPolicy& operator=(const ConversionPolicy& other) = delete;
virtual ~ConversionPolicy();
// Gets the sanitized conversion data for a conversion. This strips entropy
// from the provided to data to at most 3 bits of information.
virtual std::string GetSanitizedConversionData(
uint64_t conversion_data) const;
// Gets the sanitized impression data for an impression. Returns the decoded
// number as a hexadecimal string.
virtual std::string GetSanitizedImpressionData(
uint64_t impression_data) const;
// Returns the expiry time for an impression that is clamped to a maximum
// value of 30 days from |impression_time|.
virtual base::Time GetExpiryTimeForImpression(
const base::Optional<base::TimeDelta>& declared_expiry,
base::Time impression_time) const;
// Delays reports that should have been sent while the browser was not open by
// given them a noisy report time to help disassociate them from other
// reports.
virtual base::Time GetReportTimeForExpiredReportAtStartup(
base::Time now) const;
private:
// For testing only.
explicit ConversionPolicy(std::unique_ptr<NoiseProvider> noise_provider);
// Whether the API is running in debug mode. No noise or delay should be used.
const bool debug_mode_;
std::unique_ptr<NoiseProvider> noise_provider_;
};
} // namespace content
#endif // CONTENT_BROWSER_CONVERSIONS_CONVERSION_POLICY_H_
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