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// Copyright 2024 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/registration_info.h"
#include <optional>
#include <string>
#include <string_view>
#include "base/metrics/histogram_functions.h"
#include "base/types/expected.h"
#include "base/types/expected_macros.h"
#include "components/attribution_reporting/parsing_utils.h"
#include "components/attribution_reporting/registrar.h"
#include "net/http/structured_headers.h"
namespace attribution_reporting {
namespace {
base::expected<std::optional<Registrar>, ParseError> ParsePreferredPlatform(
const net::structured_headers::Dictionary& dict) {
auto iter = dict.find("preferred-platform");
if (iter == dict.end()) {
return std::nullopt;
}
const auto& parameterized_member = iter->second;
if (parameterized_member.member_is_inner_list) {
return base::unexpected(ParseError());
}
const auto& parameterized_item = parameterized_member.member.front();
if (!parameterized_item.item.is_token()) {
return base::unexpected(ParseError());
}
const std::string& token = parameterized_item.item.GetString();
if (token == "web") {
return Registrar::kWeb;
} else if (token == "os") {
return Registrar::kOs;
} else {
return base::unexpected(ParseError());
}
}
base::expected<bool, ParseError> ParseReportHeaderErrors(
const net::structured_headers::Dictionary& dict) {
auto iter = dict.find("report-header-errors");
if (iter == dict.end()) {
return false;
}
const auto& parameterized_member = iter->second;
if (parameterized_member.member_is_inner_list) {
return base::unexpected(ParseError());
}
const auto& parameterized_item = parameterized_member.member.front();
if (!parameterized_item.item.is_boolean()) {
return base::unexpected(ParseError());
}
return parameterized_item.item.GetBoolean();
}
} // namespace
// static
base::expected<RegistrationInfo, RegistrationInfoError>
RegistrationInfo::ParseInfo(std::string_view header) {
if (header.empty()) {
return RegistrationInfo();
}
base::expected<RegistrationInfo, RegistrationInfoError> info =
base::unexpected(RegistrationInfoError::kRootInvalid);
if (const auto dict = net::structured_headers::ParseDictionary(header)) {
info = ParseInfo(*dict);
}
if (!info.has_value()) {
RecordRegistrationInfoError(info.error());
}
return info;
}
// static
base::expected<RegistrationInfo, RegistrationInfoError>
RegistrationInfo::ParseInfo(const net::structured_headers::Dictionary& dict) {
ASSIGN_OR_RETURN(std::optional<Registrar> preferred_platform,
ParsePreferredPlatform(dict).transform_error([](ParseError) {
return RegistrationInfoError::kInvalidPreferredPlatform;
}));
ASSIGN_OR_RETURN(
bool report_header_errors,
ParseReportHeaderErrors(dict).transform_error([](ParseError) {
return RegistrationInfoError::kInvalidReportHeaderErrors;
}));
return RegistrationInfo(preferred_platform, report_header_errors);
}
void RecordRegistrationInfoError(RegistrationInfoError error) {
base::UmaHistogramEnumeration("Conversions.RegistrationInfoError", error);
}
} // namespace attribution_reporting
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