1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
content / browser / attribution_reporting / aggregatable_attribution_utils.cc [blame]
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/attribution_reporting/aggregatable_attribution_utils.h"
#include <stddef.h>
#include <stdint.h>
#include <iterator>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "base/check.h"
#include "base/feature_list.h"
#include "base/functional/overloaded.h"
#include "base/metrics/histogram_functions.h"
#include "base/notreached.h"
#include "base/numerics/checked_math.h"
#include "base/numerics/clamped_math.h"
#include "base/numerics/safe_conversions.h"
#include "base/ranges/algorithm.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/time.h"
#include "base/values.h"
#include "components/attribution_reporting/aggregatable_trigger_config.h"
#include "components/attribution_reporting/aggregatable_trigger_data.h"
#include "components/attribution_reporting/aggregatable_utils.h"
#include "components/attribution_reporting/aggregatable_values.h"
#include "components/attribution_reporting/aggregation_keys.h"
#include "components/attribution_reporting/constants.h"
#include "components/attribution_reporting/features.h"
#include "components/attribution_reporting/filters.h"
#include "components/attribution_reporting/source_registration_time_config.mojom.h"
#include "components/attribution_reporting/source_type.mojom-forward.h"
#include "components/attribution_reporting/suitable_origin.h"
#include "content/browser/aggregation_service/aggregatable_report.h"
#include "content/browser/aggregation_service/aggregation_service_features.h"
#include "content/browser/attribution_reporting/attribution_info.h"
#include "content/browser/attribution_reporting/attribution_report.h"
#include "net/base/schemeful_site.h"
#include "third_party/abseil-cpp/absl/types/variant.h"
#include "third_party/blink/public/mojom/aggregation_service/aggregatable_report.mojom.h"
namespace content {
namespace {
// Note: use the same time serialization as in aggregatable_report.cc.
// Consider sharing logic if more call-sites need this.
std::string SerializeTimeRoundedDownToWholeDayInSeconds(base::Time time) {
// TODO(csharrison, linnan): Validate that `time` is valid (e.g. not null /
// inf).
base::Time rounded =
attribution_reporting::RoundDownToWholeDaySinceUnixEpoch(time);
return base::NumberToString(rounded.InMillisecondsSinceUnixEpoch() /
base::Time::kMillisecondsPerSecond);
}
bool IsAggregatableFilteringIdsEnabled() {
return base::FeatureList::IsEnabled(
attribution_reporting::features::
kAttributionReportingAggregatableFilteringIds) &&
base::FeatureList::IsEnabled(
kPrivacySandboxAggregationServiceFilteringIds);
}
} // namespace
std::vector<blink::mojom::AggregatableReportHistogramContribution>
CreateAggregatableHistogram(
const attribution_reporting::FilterData& source_filter_data,
attribution_reporting::mojom::SourceType source_type,
const base::Time& source_time,
const base::Time& trigger_time,
const attribution_reporting::AggregationKeys& keys,
const std::vector<attribution_reporting::AggregatableTriggerData>&
aggregatable_trigger_data,
const std::vector<attribution_reporting::AggregatableValues>&
aggregatable_values) {
size_t num_trigger_data_filtered = 0;
attribution_reporting::AggregationKeys::Keys buckets = keys.keys();
// For each piece of trigger data specified, check if its filters/not_filters
// match for the given source, and if applicable modify the bucket based on
// the given key piece.
for (const auto& data : aggregatable_trigger_data) {
if (!source_filter_data.Matches(source_type, source_time, trigger_time,
data.filters())) {
++num_trigger_data_filtered;
continue;
}
for (const auto& source_key : data.source_keys()) {
auto bucket = buckets.find(source_key);
if (bucket == buckets.end()) {
continue;
}
bucket->second |= data.key_piece();
}
}
std::vector<blink::mojom::AggregatableReportHistogramContribution>
contributions;
const bool filtering_id_enabled = IsAggregatableFilteringIdsEnabled();
for (const auto& aggregatable_value : aggregatable_values) {
if (source_filter_data.Matches(source_type, source_time, trigger_time,
aggregatable_value.filters())) {
const attribution_reporting::AggregatableValues::Values& values =
aggregatable_value.values();
for (const auto& [key_id, key] : buckets) {
auto value = values.find(key_id);
if (value == values.end()) {
continue;
}
std::optional<uint64_t> filtering_id;
if (filtering_id_enabled) {
filtering_id = value->second.filtering_id();
}
contributions.emplace_back(
key, base::checked_cast<int32_t>(value->second.value()),
filtering_id);
}
break;
}
}
if (!aggregatable_trigger_data.empty()) {
base::ClampedNumeric<size_t> percentage = num_trigger_data_filtered;
percentage *= 100;
percentage /= aggregatable_trigger_data.size();
base::UmaHistogramPercentage(
"Conversions.AggregatableReport.FilteredTriggerDataPercentage",
percentage);
}
if (!buckets.empty()) {
base::ClampedNumeric<size_t> percentage = buckets.size();
percentage -= contributions.size();
percentage *= 100;
percentage /= buckets.size();
base::UmaHistogramPercentage(
"Conversions.AggregatableReport.DroppedKeysPercentage", percentage);
}
static_assert(attribution_reporting::kMaxAggregationKeysPerSource == 20,
"Bump the version for histogram "
"Conversions.AggregatableReport.NumContributionsPerReport2");
base::UmaHistogramExactLinear(
"Conversions.AggregatableReport.NumContributionsPerReport2",
base::saturated_cast<int>(contributions.size()),
attribution_reporting::kMaxAggregationKeysPerSource + 1);
// If total values exceeds the max, log the metrics as 100,000 to measure
// how often the max is exceeded.
static_assert(attribution_reporting::kMaxAggregatableValue == 65536);
const int64_t max_value = attribution_reporting::kMaxAggregatableValue + 1;
int64_t adjusted_value = std::min(
base::MakeStrictNum(max_value),
GetTotalAggregatableValues(contributions).ValueOrDefault(max_value));
base::UmaHistogramCounts100000(
"Conversions.AggregatableReport.TotalBudgetPerReport",
adjusted_value == max_value ? 100000
: base::saturated_cast<int>(adjusted_value));
return contributions;
}
std::optional<AggregatableReportRequest> CreateAggregatableReportRequest(
const AttributionReport& report) {
base::Time source_time;
const AttributionReport::CommonAggregatableData* common_aggregatable_data =
nullptr;
std::vector<blink::mojom::AggregatableReportHistogramContribution>
contributions;
absl::visit(
base::Overloaded{
[](const AttributionReport::EventLevelData&) {
NOTREACHED_IN_MIGRATION();
},
[&](const AttributionReport::AggregatableAttributionData& data) {
source_time = data.source_time;
common_aggregatable_data = &data.common_data;
contributions = data.contributions;
},
[&](const AttributionReport::NullAggregatableData& data) {
source_time = data.fake_source_time;
common_aggregatable_data = &data.common_data;
},
},
report.data());
DCHECK(common_aggregatable_data);
const AttributionInfo& attribution_info = report.attribution_info();
AggregatableReportSharedInfo::DebugMode debug_mode =
report.CanDebuggingBeEnabled()
? AggregatableReportSharedInfo::DebugMode::kEnabled
: AggregatableReportSharedInfo::DebugMode::kDisabled;
base::Value::Dict additional_fields;
switch (common_aggregatable_data->aggregatable_trigger_config
.source_registration_time_config()) {
case attribution_reporting::mojom::SourceRegistrationTimeConfig::kInclude:
additional_fields.Set(
"source_registration_time",
SerializeTimeRoundedDownToWholeDayInSeconds(source_time));
break;
case attribution_reporting::mojom::SourceRegistrationTimeConfig::kExclude:
break;
}
SetAttributionDestination(
additional_fields, net::SchemefulSite(attribution_info.context_origin));
std::optional<size_t> filtering_id_max_bytes;
if (IsAggregatableFilteringIdsEnabled()) {
filtering_id_max_bytes =
common_aggregatable_data->aggregatable_trigger_config
.aggregatable_filtering_id_max_bytes()
.value();
} else {
// We clear the filtering ids to avoid hitting `FilteringIdsFitInMaxBytes()`
// invalidly in case that filtering ids were unexpectedly set in the db for
// some reason like db corruption.
for (auto& contribution : contributions) {
contribution.filtering_id.reset();
}
}
return AggregatableReportRequest::Create(
AggregationServicePayloadContents(
AggregationServicePayloadContents::Operation::kHistogram,
std::move(contributions),
blink::mojom::AggregationServiceMode::kDefault,
common_aggregatable_data->aggregation_coordinator_origin
? std::make_optional(
**common_aggregatable_data->aggregation_coordinator_origin)
: std::nullopt,
/*max_contributions_allowed=*/
attribution_reporting::kMaxAggregationKeysPerSource,
filtering_id_max_bytes),
AggregatableReportSharedInfo(
report.initial_report_time(), report.external_report_id(),
report.reporting_origin(), debug_mode, std::move(additional_fields),
filtering_id_max_bytes.has_value()
? AttributionReport::CommonAggregatableData::
kVersionWithFlexibleContributionFiltering
: AttributionReport::CommonAggregatableData::kVersion,
AttributionReport::CommonAggregatableData::kApiIdentifier),
// The returned request cannot be serialized due to the null `delay_type`.
/*delay_type=*/std::nullopt);
}
base::CheckedNumeric<int64_t> GetTotalAggregatableValues(
const std::vector<blink::mojom::AggregatableReportHistogramContribution>&
contributions) {
base::CheckedNumeric<int64_t> total_value = 0;
for (const blink::mojom::AggregatableReportHistogramContribution&
contribution : contributions) {
total_value += contribution.value;
}
return total_value;
}
void SetAttributionDestination(base::Value::Dict& dict,
const net::SchemefulSite& destination) {
dict.Set("attribution_destination", destination.Serialize());
}
} // namespace content