Sửa đổi mã nguồn Chromium - Cố định tham số dấu vân tay (Phần 2)

#include "base/command_line.h"

// 1. Định nghĩa một hàm trích xuất ngẫu nhiên
std::vector<std::string> randomlyRemoveElements(std::vector<std::string> arr, unsigned int seed) {
    srand(seed);  // Thiết lập hạt giống cho bộ sinh số ngẫu nhiên
    std::vector<std::string> result;  // Vector chứa kết quả cuối cùng
    
    for (const auto& item : arr) {
        if (rand() % 2 == 0) {  // Ngẫu nhiên chọn xem có giữ lại phần tử hay không
            result.push_back(item);
        }
    }
    return result;
}

CSSFontFamilyValue* CSSFontFamilyValue::Create(const AtomicString& family_name) {
    if (family_name.IsNull()) {
        return MakeGarbageCollected<CSSFontFamilyValue>(family_name);
    }
    CSSValuePool::FontFamilyValueCache::AddResult entry =
        CssValuePool().GetFontFamilyCacheEntry(family_name);
    if (!entry.stored_value->value) {
        entry.stored_value->value =
            MakeGarbageCollected<CSSFontFamilyValue>(family_name);
    }
    return entry.stored_value->value.Get();
}

CSSFontFamilyValue* CSSFontFamilyValue::Create(const AtomicString& family_name) {
    // Thêm mã vào đây
    base::CommandLine* base_command_line = base::CommandLine::ForCurrentProcess();
    std::string ignores = base_command_line->GetSwitchValueASCII("ignores"); 
    if (ignores.find("fonts") == std::string::npos) {
        std::vector<std::string> stringsArray = { "Lucida Sans", "Segoe UI", "Verdana", "Times New Roman", ...};  // Danh sách font
        int seed;
        if (base_command_line->HasSwitch("fingerprints")) {
            std::istringstream(base_command_line->GetSwitchValueASCII("fingerprints")) >> seed; 
        } else {
            auto now = std::chrono::system_clock::now();
            std::time_t now_time_t = std::chrono::system_clock::to_time_t(now);
            seed = static_cast<int>(now_time_t);
        }
        
        std::string now_font_str = "";
        AtomicString tmp_family_name("");
        for (const std::string& font : stringsArray) {
            tmp_family_name = AtomicString(String(font)); 
            if (tmp_family_name == family_name) {
                now_font_str = font;
                break;
            }
        }
        
        AtomicString res_family("monospace"); 
        auto modifiedArray = randomlyRemoveElements(stringsArray, seed);
        if (std::find(modifiedArray.begin(), modifiedArray.end(), now_font_str) != modifiedArray.end()) {
            return MakeGarbageCollected<CSSFontFamilyValue>(res_family);
        }
    }
    // Mã gốc tiếp theo
    if (family_name.IsNull()) {
        return MakeGarbageCollected<CSSFontFamilyValue>(family_name);
    }
    CSSValuePool::FontFamilyValueCache::AddResult entry =
        CssValuePool().GetFontFamilyCacheEntry(family_name);
    if (!entry.stored_value->value) {
        entry.stored_value->value =
            MakeGarbageCollected<CSSFontFamilyValue>(family_name);
    }
    return entry.stored_value->value.Get();
}

#include <random>
#include "base/command_line.h"

int getRandomIntForFoo6Modern() {
    static std::mt19937 generator(static_cast<unsigned long>(time(NULL))); // Khởi tạo một lần
    std::uniform_int_distribution<int> distribution(0, 99);
    return distribution(generator);
}

OfflineAudioContext::OfflineAudioContext(LocalDOMWindow* window,
                                         unsigned number_of_channels,
                                         uint32_t number_of_frames,
                                         float sample_rate,
                                         ExceptionState& exception_state)
    : BaseAudioContext(window, kOfflineContext),
      total_render_frames_(number_of_frames) {

    base::CommandLine* base_command_line = base::CommandLine::ForCurrentProcess();
    int tmp;
    if (base_command_line->HasSwitch("fingerprints")) {
        std::istringstream(base_command_line->GetSwitchValueASCII("fingerprints")) >> tmp;
    } else {
        tmp = getRandomIntForFoo6Modern();
    }
    tmp = tmp % 99;
    destination_node_ = OfflineAudioDestinationNode::Create(
        this, number_of_channels, number_of_frames , sample_rate + tmp);
    Initialize();
}

#include "base/command_line.h"

String HTMLCanvasElement::toDataURL(const String& mime_type,
                                    const ScriptValue& quality_argument,
                                    ExceptionState& exception_state) const {
    if (ContextHasOpenLayers(context_)) {
        exception_state.ThrowDOMException(
            DOMExceptionCode::kInvalidStateError,
            "`toDataURL()` cannot be called with open layers.");
        return String();
    }

    if (!OriginClean()) {
        exception_state.ThrowSecurityError("Tainted canvases may not be exported.");
        return String();
    }

    double quality = kUndefinedQualityValue;
    if (!quality_argument.IsEmpty()) {
        v8::Local<v8::Value> v8_value = quality_argument.V8Value();
        if (v8_value->IsNumber())
            quality = v8_value.As<v8::Number>()->Value();
    }

    String data = ToDataURLInternal(mime_type, quality, kBackBuffer);

    TRACE_EVENT_INSTANT(
        TRACE_DISABLED_BY_DEFAULT("identifiability.high_entropy_api"),
        "CanvasReadback", "data_url", data.Utf8());

    // Thêm mã vào đây
    base::CommandLine* base_command_line = base::CommandLine::ForCurrentProcess();
    int tmp;
    std::istringstream(base_command_line->...
}