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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.
#include "components/attribution_reporting/trigger_config.h"
#include <stdint.h>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "base/check.h"
#include "base/containers/flat_set.h"
#include "base/containers/flat_tree.h"
#include "base/metrics/histogram_functions.h"
#include "base/time/time.h"
#include "base/types/expected.h"
#include "base/types/expected_macros.h"
#include "base/values.h"
#include "components/attribution_reporting/constants.h"
#include "components/attribution_reporting/parsing_utils.h"
#include "components/attribution_reporting/source_registration_error.mojom.h"
#include "components/attribution_reporting/source_type.mojom.h"
#include "components/attribution_reporting/trigger_data_matching.mojom.h"
namespace attribution_reporting {
namespace {
using ::attribution_reporting::mojom::SourceRegistrationError;
using ::attribution_reporting::mojom::SourceType;
using ::attribution_reporting::mojom::TriggerDataMatching;
constexpr uint32_t DefaultTriggerDataCardinality(SourceType source_type) {
switch (source_type) {
case SourceType::kNavigation:
return 8;
case SourceType::kEvent:
return 2;
}
}
base::expected<TriggerDataSet::TriggerData, SourceRegistrationError>
ParseTriggerData(const base::Value& value) {
const base::Value::List* list = value.GetIfList();
if (!list) {
return base::unexpected(SourceRegistrationError::kTriggerDataListInvalid);
}
const size_t size = list->size();
if (size > kMaxTriggerDataPerSource) {
return base::unexpected(SourceRegistrationError::kExcessiveTriggerData);
}
TriggerDataSet::TriggerData trigger_data;
trigger_data.reserve(size);
for (const base::Value& item : *list) {
ASSIGN_OR_RETURN(uint32_t trigger_datum, ParseUint32(item), [](ParseError) {
return SourceRegistrationError::kTriggerDataListInvalid;
});
auto [_, inserted] = trigger_data.insert(trigger_datum);
if (!inserted) {
return base::unexpected(SourceRegistrationError::kDuplicateTriggerData);
}
}
return trigger_data;
}
bool IsTriggerDataValid(const TriggerDataSet::TriggerData& trigger_data) {
return trigger_data.size() <= kMaxTriggerDataPerSource;
}
base::expected<void, SourceRegistrationError>
ValidateTriggerDataForTriggerDataMatching(
const TriggerDataSet::TriggerData& trigger_data,
TriggerDataMatching trigger_data_matching) {
switch (trigger_data_matching) {
case TriggerDataMatching::kExact:
return base::ok();
case TriggerDataMatching::kModulus:
for (uint32_t i = 0; const uint32_t trigger_datum : trigger_data) {
if (trigger_datum != i) {
return base::unexpected(
SourceRegistrationError::kInvalidTriggerDataForMatchingMode);
}
++i;
}
return base::ok();
}
}
} // namespace
base::expected<TriggerDataMatching, SourceRegistrationError>
ParseTriggerDataMatching(const base::Value::Dict& dict) {
const base::Value* value = dict.Find(kTriggerDataMatching);
if (!value) {
return TriggerDataMatching::kModulus;
}
const std::string* str = value->GetIfString();
if (!str) {
return base::unexpected(
SourceRegistrationError::kTriggerDataMatchingValueInvalid);
} else if (*str == kTriggerDataMatchingExact) {
return TriggerDataMatching::kExact;
} else if (*str == kTriggerDataMatchingModulus) {
return TriggerDataMatching::kModulus;
} else {
return base::unexpected(
SourceRegistrationError::kTriggerDataMatchingValueInvalid);
}
}
void Serialize(base::Value::Dict& dict,
TriggerDataMatching trigger_data_matching) {
switch (trigger_data_matching) {
case TriggerDataMatching::kExact:
dict.Set(kTriggerDataMatching, kTriggerDataMatchingExact);
break;
case TriggerDataMatching::kModulus:
dict.Set(kTriggerDataMatching, kTriggerDataMatchingModulus);
break;
}
}
std::optional<uint32_t> TriggerDataSet::find(
uint64_t trigger_data,
TriggerDataMatching trigger_data_matching) const {
switch (trigger_data_matching) {
case TriggerDataMatching::kExact:
if (trigger_data_.contains(trigger_data)) {
return trigger_data;
}
return std::nullopt;
case TriggerDataMatching::kModulus:
// Prevent modulus-by-zero.
if (trigger_data_.empty()) {
return std::nullopt;
}
// `std::next()` is constant-time due to the underlying iterator being
// random-access.
const uint32_t out = *std::next(trigger_data_.begin(),
trigger_data % trigger_data_.size());
base::UmaHistogramBoolean(
"Conversions.TriggerDataMatchingModulusSameInputOutput",
trigger_data == out);
return out;
}
}
// static
base::expected<TriggerDataSet, SourceRegistrationError> TriggerDataSet::Parse(
const base::Value::Dict& registration,
SourceType source_type,
TriggerDataMatching trigger_data_matching) {
const base::Value* trigger_data = registration.Find(kTriggerData);
if (!trigger_data) {
return TriggerDataSet(source_type);
}
ASSIGN_OR_RETURN(TriggerData trigger_data_set,
ParseTriggerData(*trigger_data));
RETURN_IF_ERROR(ValidateTriggerDataForTriggerDataMatching(
trigger_data_set, trigger_data_matching));
return TriggerDataSet(std::move(trigger_data_set));
}
TriggerDataSet::TriggerDataSet(SourceType source_type) {
uint32_t cardinality = DefaultTriggerDataCardinality(source_type);
TriggerData::container_type trigger_data;
trigger_data.reserve(cardinality);
for (uint32_t i = 0; i < cardinality; ++i) {
trigger_data.push_back(i);
}
trigger_data_.replace(std::move(trigger_data));
}
// static
std::optional<TriggerDataSet> TriggerDataSet::Create(TriggerData trigger_data) {
if (!IsTriggerDataValid(trigger_data)) {
return std::nullopt;
}
return TriggerDataSet(std::move(trigger_data));
}
TriggerDataSet::TriggerDataSet(TriggerData trigger_data)
: trigger_data_(std::move(trigger_data)) {
CHECK(IsTriggerDataValid(trigger_data_));
}
TriggerDataSet::TriggerDataSet() = default;
TriggerDataSet::~TriggerDataSet() = default;
TriggerDataSet::TriggerDataSet(const TriggerDataSet&) = default;
TriggerDataSet& TriggerDataSet::operator=(const TriggerDataSet&) = default;
TriggerDataSet::TriggerDataSet(TriggerDataSet&&) = default;
TriggerDataSet& TriggerDataSet::operator=(TriggerDataSet&&) = default;
base::Value::Dict TriggerDataSet::ToJson() const {
base::Value::Dict dict;
Serialize(dict);
return dict;
}
void TriggerDataSet::Serialize(base::Value::Dict& dict) const {
auto trigger_data_list =
base::Value::List::with_capacity(trigger_data_.size());
for (const uint32_t trigger_data : trigger_data_) {
trigger_data_list.Append(Uint32ToJson(trigger_data));
}
dict.Set(kTriggerData, std::move(trigger_data_list));
}
} // namespace attribution_reporting
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