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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/fingerprinting_protection/canvas_noise_token_data.h"
#include <cstdint>
#include <memory>
#include "base/feature_list.h"
#include "base/numerics/byte_conversions.h"
#include "base/supports_user_data.h"
#include "components/fingerprinting_protection_filter/interventions/common/interventions_features.h"
#include "content/public/browser/browser_context.h"
#include "third_party/blink/public/common/features.h"
namespace content {
namespace {
const void* const kBrowserContextCanvasNoiseTokenKey =
&kBrowserContextCanvasNoiseTokenKey;
} // namespace
// static
uint64_t CanvasNoiseTokenData::GetToken(BrowserContext* context) {
CHECK(base::FeatureList::IsEnabled(
fingerprinting_protection_interventions::features::kCanvasNoise));
CanvasNoiseTokenData* data = static_cast<CanvasNoiseTokenData*>(
context->GetUserData(&kBrowserContextCanvasNoiseTokenKey));
if (data != nullptr) {
return data->session_token_;
}
return CanvasNoiseTokenData::SetNewToken(context);
}
// static
uint64_t CanvasNoiseTokenData::SetNewToken(BrowserContext* context) {
CHECK(base::FeatureList::IsEnabled(
fingerprinting_protection_interventions::features::kCanvasNoise));
auto new_data = std::make_unique<CanvasNoiseTokenData>();
uint64_t token = new_data->session_token_;
context->SetUserData(&kBrowserContextCanvasNoiseTokenKey,
std::move(new_data));
return token;
}
} // namespace content
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