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// Copyright 2025 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/interest_group/ba_test_util.h"
#include <stddef.h>
#include <stdint.h>
#include <array>
#include <map>
#include <string>
#include <string_view>
#include <vector>
#include "base/base64.h"
#include "base/check.h"
#include "base/containers/span.h"
#include "components/cbor/reader.h"
#include "components/cbor/values.h"
#include "content/browser/interest_group/interest_group_auction.h"
#include "content/public/test/privacy_sandbox_coordinator_test_util.h"
#include "net/third_party/quiche/src/quiche/oblivious_http/common/oblivious_http_header_key_config.h"
#include "net/third_party/quiche/src/quiche/oblivious_http/oblivious_http_gateway.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/boringssl/src/include/openssl/hpke.h"
#include "third_party/zlib/google/compression_utils.h"
#include "url/origin.h"
namespace content {
JoinBidWinHistoryForTest::JoinBidWinHistoryForTest() = default;
JoinBidWinHistoryForTest::~JoinBidWinHistoryForTest() = default;
JoinBidWinHistoryForTest::JoinBidWinHistoryForTest(JoinBidWinHistoryForTest&) =
default;
JoinBidWinHistoryForTest& JoinBidWinHistoryForTest::operator=(
JoinBidWinHistoryForTest&) = default;
JoinBidWinHistoryForTest::JoinBidWinHistoryForTest(JoinBidWinHistoryForTest&&) =
default;
JoinBidWinHistoryForTest& JoinBidWinHistoryForTest::operator=(
JoinBidWinHistoryForTest&&) = default;
std::map<std::string, JoinBidWinHistoryForTest> ExtractJoinBidWinHistories(
const std::string_view bna_request,
const url::Origin& bidder) {
std::map<std::string, JoinBidWinHistoryForTest> result;
// Decrypt the message.
CHECK(!bna_request.empty());
auto key_config =
quiche::ObliviousHttpHeaderKeyConfig::Create(
kTestPrivacySandboxCoordinatorId, EVP_HPKE_DHKEM_X25519_HKDF_SHA256,
EVP_HPKE_HKDF_SHA256, EVP_HPKE_AES_256_GCM)
.value();
auto ohttp_gateway =
quiche::ObliviousHttpGateway::Create(
GetTestPrivacySandboxCoordinatorPrivateKey(), key_config)
.value();
EXPECT_EQ(0x00, bna_request[0]);
auto request = ohttp_gateway.DecryptObliviousHttpRequest(
bna_request.substr(1), kBiddingAndAuctionEncryptionRequestMediaType);
CHECK(request.ok()) << request.status();
auto plaintext_data = request->GetPlaintextData();
EXPECT_EQ(0x02, plaintext_data[0]);
size_t request_size = 0;
for (size_t idx = 0; idx < sizeof(uint32_t); idx++) {
request_size =
(request_size << 8) | static_cast<uint8_t>(plaintext_data[idx + 1]);
}
// Parse the top-level message and find `bidder` in interestGroups.
cbor::Value top_level_message =
cbor::Reader::Read(
base::as_byte_span(plaintext_data.substr(5, request_size)))
.value();
cbor::Value::BinaryValue compressed_groups =
top_level_message.GetMap()
.at(cbor::Value("interestGroups"))
.GetMap()
.at(cbor::Value(bidder.Serialize()))
.GetBytestring();
// Decompress the interest groups of `bidder`.
std::vector<uint8_t> uncompressed_groups_buf(
compression::GetUncompressedSize(compressed_groups));
CHECK(compression::GzipUncompress(/*input=*/compressed_groups,
/*output=*/uncompressed_groups_buf));
// Parse the interest groups of `bidder` and pull out their browser signals.
cbor::Value uncompressed_groups =
cbor::Reader::Read(uncompressed_groups_buf).value();
for (const cbor::Value& group_val : uncompressed_groups.GetArray()) {
const cbor::Value::MapValue& group = group_val.GetMap();
std::string name = group.at(cbor::Value("name")).GetString();
JoinBidWinHistoryForTest join_bid_win_history;
const cbor::Value::MapValue& browser_signals =
group.at(cbor::Value("browserSignals")).GetMap();
join_bid_win_history.join_count =
browser_signals.at(cbor::Value("joinCount")).GetInteger();
join_bid_win_history.bid_count =
browser_signals.at(cbor::Value("bidCount")).GetInteger();
for (const cbor::Value& prev_wins_val :
browser_signals.at(cbor::Value("prevWins")).GetArray()) {
JoinBidWinHistoryForTest::PrevWin prev_win;
const cbor::Value::ArrayValue& prev_wins = prev_wins_val.GetArray();
prev_win.prev_win_time_seconds = prev_wins.at(0).GetInteger();
prev_win.ad_render_id = prev_wins.at(1).GetString();
join_bid_win_history.prev_wins.emplace_back(std::move(prev_win));
}
result[name] = std::move(join_bid_win_history);
}
return result;
}
} // namespace content
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