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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 "content/browser/interest_group/auction_nonce_manager.h"
#include <memory>
#include <string>
#include <string_view>
#include "base/containers/contains.h"
#include "base/feature_list.h"
#include "base/strings/string_number_conversions.h"
#include "base/uuid.h"
#include "content/browser/devtools/devtools_instrumentation.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "third_party/blink/public/common/features_generated.h"
namespace content {
AuctionNonceManager::AuctionNonceManager(RenderFrameHostImpl* frame_host)
: frame_host_(frame_host) {}
AuctionNonceManager::~AuctionNonceManager() = default;
namespace {
// Returns true iff the first 30 characters of the two provided UUIDs are
// identical. Each UUID follows the standard structure of a UUIDv4, such that
// each is represented as a 36-character string of groups of hexadecimal digits
// separated by dashes. If either Uuid provided is not valid, this always return
// false.
bool HasIdenticalNoncePrefix(base::Uuid base_nonce, AuctionNonce nonce) {
if (!base_nonce.is_valid() || !nonce->is_valid()) {
return false;
}
const std::string& base_nonce_string = base_nonce.AsLowercaseString();
const std::string& nonce_string = nonce->AsLowercaseString();
return base_nonce_string.substr(0, 30) == nonce_string.substr(0, 30);
}
// Gets the three least significant bytes of the provided nonce and returns
// them as a uint32_t. This expects that the nonce was already verified to be
// valid.
uint32_t GetNonceSuffix(AuctionNonce nonce) {
const std::string& nonce_string = nonce->AsLowercaseString();
uint32_t nonce_suffix;
CHECK(base::HexStringToUInt(std::string_view(nonce_string).substr(30),
&nonce_suffix));
return nonce_suffix;
}
} // namespace
bool AuctionNonceManager::ClaimAuctionNonceIfAvailable(AuctionNonce nonce) {
if (!frame_host_ || !nonce->is_valid()) {
return false;
}
if (!HasIdenticalNoncePrefix(frame_host_->GetBaseAuctionNonce(), nonce)) {
devtools_instrumentation::LogWorkletMessage(
*frame_host_, blink::mojom::ConsoleMessageLevel::kError,
"Invalid AuctionConfig. The config provided an auctionNonce value "
"that was _not_ created by a previous call to createAuctionNonce.");
return false;
}
uint32_t nonce_suffix = GetNonceSuffix(nonce);
if (base::Contains(claimed_auction_nonce_suffixes_, nonce_suffix)) {
devtools_instrumentation::LogWorkletMessage(
*frame_host_, blink::mojom::ConsoleMessageLevel::kError,
"Invalid AuctionConfig. The config provided an auctionNonce value "
"that was already used by a previous call auction config.");
return false;
}
claimed_auction_nonce_suffixes_.insert(nonce_suffix);
return true;
}
} // namespace content
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