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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/destination_set.h"
#include <algorithm>
#include <optional>
#include <string>
#include <utility>
#include "base/check.h"
#include "base/containers/flat_set.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/source_registration_error.mojom-shared.h"
#include "components/attribution_reporting/suitable_origin.h"
#include "mojo/public/cpp/bindings/default_construct_tag.h"
#include "net/base/schemeful_site.h"
#include "third_party/abseil-cpp/absl/functional/overload.h"
namespace attribution_reporting {
namespace {
using ::attribution_reporting::mojom::SourceRegistrationError;
bool DestinationsValid(const DestinationSet::Destinations& destinations) {
return !destinations.empty() && destinations.size() <= kMaxDestinations &&
std::ranges::all_of(destinations, &IsSitePotentiallySuitable);
}
} // namespace
// static
std::optional<DestinationSet> DestinationSet::Create(
Destinations destinations) {
if (!DestinationsValid(destinations)) {
return std::nullopt;
}
return DestinationSet(std::move(destinations));
}
// static
base::expected<DestinationSet, SourceRegistrationError>
DestinationSet::FromJSON(const base::Value* v) {
if (!v) {
return base::unexpected(SourceRegistrationError::kDestinationMissing);
}
// Although we build this set iteratively, which results in O(n^2)
// construction, n is very small, so this is fine.
static_assert(kMaxDestinations == 3,
"Consider using more performant set construction if the size "
"limit increases.");
base::flat_set<net::SchemefulSite> destination_sites;
using AppendIfValidResult = base::expected<void, SourceRegistrationError>;
const auto append_if_valid =
[&](const std::string& str,
SourceRegistrationError error) -> AppendIfValidResult {
auto origin = SuitableOrigin::Deserialize(str);
if (!origin.has_value()) {
return base::unexpected(error);
}
destination_sites.emplace(*origin);
return base::ok();
};
RETURN_IF_ERROR(v->Visit(absl::Overload{
[&](const std::string& str) {
return append_if_valid(
str, SourceRegistrationError::kDestinationUntrustworthy);
},
[&](const base::Value::List& list) -> AppendIfValidResult {
if (list.empty()) {
return base::unexpected(
SourceRegistrationError::kDestinationWrongType);
}
destination_sites.reserve(std::min(list.size(), kMaxDestinations));
for (const auto& item : list) {
const std::string* str = item.GetIfString();
if (!str) {
return base::unexpected(
SourceRegistrationError::kDestinationWrongType);
}
RETURN_IF_ERROR(append_if_valid(
*str, SourceRegistrationError::kDestinationListUntrustworthy));
if (destination_sites.size() > kMaxDestinations) {
return base::unexpected(
SourceRegistrationError::kDestinationWrongType);
}
}
return base::ok();
},
[](const auto&) -> AppendIfValidResult {
return base::unexpected(SourceRegistrationError::kDestinationWrongType);
},
}));
return DestinationSet(std::move(destination_sites));
}
DestinationSet::DestinationSet(Destinations destinations)
: destinations_(std::move(destinations)) {
CHECK(IsValid());
}
DestinationSet::DestinationSet(mojo::DefaultConstruct::Tag) {
CHECK(!IsValid());
}
DestinationSet::~DestinationSet() = default;
DestinationSet::DestinationSet(const DestinationSet&) = default;
DestinationSet::DestinationSet(DestinationSet&&) = default;
DestinationSet& DestinationSet::operator=(const DestinationSet&) = default;
DestinationSet& DestinationSet::operator=(DestinationSet&&) = default;
bool DestinationSet::IsValid() const {
return DestinationsValid(destinations_);
}
base::Value DestinationSet::ToJson() const {
CHECK(IsValid());
if (destinations_.size() == 1) {
return base::Value(destinations_.begin()->Serialize());
}
auto list = base::Value::List::with_capacity(destinations_.size());
for (const auto& destination : destinations_) {
list.Append(destination.Serialize());
}
return base::Value(std::move(list));
}
} // namespace attribution_reporting
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