Privacy Focused Local Browser in C++

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// PrivacyBrowser.cpp - Local Windows Privacy Browser
// Blocks all cloud tracking, telemetry, and external connections
// Night soft light mode UI with dark theme optimized for private browsing
// Built with Win32 API + WebView2 for modern rendering without cloud dependencies
// Compile with: cl PrivacyBrowser.cpp /EHsc /link ole32.lib urlmon.lib

#include <windows.h>
#include <webview2.h>
#include <wrl/client.h>
#include <string>
#include <vector>
#include <fstream>
#include <shlobj.h>
#include <shlwapi.h>
#include <iostream>

#pragma comment(lib, "ole32.lib")
#pragma comment(lib, "urlmon.lib")
#pragma comment(lib, "shlwapi.lib")

using namespace Microsoft::WRL;

const wchar_t* APP_NAME = L"ShadowBrowse - Local Privacy Browser";
const wchar_t* USER_DATA_FOLDER = L"ShadowBrowseData";
const COLORREF NIGHT_BG = RGB(15, 18, 25);
const COLORREF NIGHT_SOFT = RGB(35, 42, 55);
const COLORREF TEXT_COLOR = RGB(180, 190, 205);

class PrivacyBrowser {
private:
    HWND hwnd = NULL;
    ICoreWebView2* webview = NULL;
    ICoreWebView2Controller* controller = NULL;
    std::wstring profilePath;

// Hardcoded blocklist - blocks all major tracking domains
    std::vector<std::wstring> blocklist = {
        L"google-analytics.com", L"googletagmanager.com", L"doubleclick.net",
        L"facebook.com", L"fb.com", L"connect.facebook.net",
        L"analytics.", L"tracker.", L"pixel.", L"beacon.",
        L"amazon-adsystem.com", L"adobe.com", L"omtrdc.net",
        L"scorecardresearch.com", L"quantserve.com", L"matomo.",
        L"cloudfront.net", L"akamai.net", L"edgecast.com",
        L"telemetry.", L"metrics.", L"crash.", L"sentry.io",
        L"mixpanel.com", L"segment.com", L"amplitude.com",
        L"hotjar.com", L"intercom.io", L"drift.com"
    };

public:
    PrivacyBrowser() {
        wchar_t path[MAX_PATH];
        SHGetFolderPathW(NULL, CSIDL_APPDATA, NULL, 0, path);
        profilePath = std::wstring(path) + L"\\" + USER_DATA_FOLDER;
        CreateDirectoryW(profilePath.c_str(), NULL);
        
        // Create local block rules file
        CreateBlockRules();
    }

~PrivacyBrowser() {
        if (controller) controller->Release();
        if (webview) webview->Release();
    }

void CreateBlockRules() {
        std::wofstream rules(profilePath + L"\\blockrules.txt");
        rules << "# ShadowBrowse - All cloud tracking blocked\n";
        for (const auto& domain : blocklist) {
            rules << "127.0.0.1 " << domain << "\n";
            rules << "127.0.0.1 www." << domain << "\n";
        }
        rules.close();
    }

bool Initialize(HINSTANCE hInstance) {
        WNDCLASSEXW wc = {0};
        wc.cbSize = sizeof(WNDCLASSEXW);
        wc.lpfnWndProc = WndProc;
        wc.hInstance = hInstance;
        wc.lpszClassName = L"ShadowBrowseClass";
        wc.hbrBackground = CreateSolidBrush(NIGHT_BG);
        wc.hCursor = LoadCursor(NULL, IDC_ARROW);
        RegisterClassExW(&wc);

hwnd = CreateWindowExW(0, L"ShadowBrowseClass", APP_NAME, 
            WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 
            1280, 800, NULL, NULL, hInstance, this);

if (!hwnd) return false;

// Set night soft light theme
        SetWindowTheme(hwnd, L"DarkMode_Explorer", NULL);
        
        ShowWindow(hwnd, SW_SHOW);
        UpdateWindow(hwnd);

// Initialize WebView2 with strict local profile and no tracking
        return CreateWebView();
    }

bool CreateWebView() {
        auto envOptions = Make<CoreWebView2EnvironmentOptions>();
        envOptions->put_AdditionalBrowserArguments(
            L"--disable-features=OptimizationHints,InterestFeed,MediaRouter,"
            L"WebRTC,AutofillServerCommunication,ChromeBrowserCloudManagement,"
            L"CalculateNativeWinOcclusion --disable-sync --no-first-run "
            L"--disable-background-networking --disable-component-update "
            L"--disable-domain-reliability --disable-metrics --disable-breakpad "
            L"--disable-client-side-phishing-detection --disable-default-apps "
            L"--disable-sync --disable-google-services --disable-logging "
            L"--disable-web-resources --disable-features=AutofillServerCommunication"
        );

HRESULT hr = CreateCoreWebView2EnvironmentWithOptions(
            profilePath.c_str(), nullptr, envOptions.Get(),
            Callback<ICoreWebView2CreateCoreWebView2EnvironmentCompletedHandler>(
                [this](HRESULT result, ICoreWebView2Environment* env) -> HRESULT {
                    if (FAILED(result)) return result;

env->CreateCoreWebView2Controller(
                        hwnd, 
                        Callback<ICoreWebView2CreateCoreWebView2ControllerCompletedHandler>(
                            [this](HRESULT result, ICoreWebView2Controller* ctrl) -> HRESULT {
                                if (FAILED(result)) return result;
                                
                                controller = ctrl;
                                controller->get_CoreWebView2(&webview);
                                
                                // Apply strict privacy settings
                                ICoreWebView2Settings* settings;
                                webview->get_Settings(&settings);
                                settings->put_IsScriptEnabled(TRUE);
                                settings->put_IsWebMessageEnabled(FALSE);
                                settings->put_IsStatusBarEnabled(FALSE);
                                settings->put_AreDefaultContextMenusEnabled(FALSE);
                                settings->put_AreDevToolsEnabled(TRUE); // For local debugging only
                                settings->put_IsPasswordAutosaveEnabled(FALSE);
                                settings->put_IsGeneralAutofillEnabled(FALSE);
                                
                                // Block all external tracking via navigation handler
                                EventRegistrationToken token;
                                webview->add_NavigationStarting(
                                    Callback<ICoreWebView2NavigationStartingEventHandler>(
                                        [this](ICoreWebView2* sender, ICoreWebView2NavigationStartingEventArgs* args) -> HRESULT {
                                            wil::unique_cotaskmem_string uri;
                                            args->get_Uri(&uri);
                                            std::wstring url(uri.get());
                                            
                                            for (const auto& blocked : blocklist) {
                                                if (url.find(blocked) != std::wstring::npos) {
                                                    args->put_Cancel(TRUE);
                                                    return S_OK;
                                                }
                                            }
                                            return S_OK;
                                        }).Get(), &token);

// Set initial blank page with night soft theme
                                webview->Navigate(L"about:blank");
                                InjectNightModeCSS();
                                
                                RECT bounds;
                                GetClientRect(hwnd, &bounds);
                                controller->put_Bounds(bounds);
                                
                                return S_OK;
                            }).Get());
                    return S_OK;
                }).Get());

return SUCCEEDED(hr);
    }

void InjectNightModeCSS() {
        if (!webview) return;
        
        std::wstring css = L"document.documentElement.style.setProperty('--bg', '#0f1219');"
                          L"document.documentElement.style.setProperty('--soft', '#232a37');"
                          L"document.body.style.backgroundColor = '#0f1219';"
                          L"document.body.style.color = '#b4becd';"
                          L"if (document.head) {"
                          L"  var style = document.createElement('style');"
                          L"  style.innerHTML = 'body { background: #0f1219 !important; color: #b4becd !important; } "
                          L"a { color: #7a9cc9 !important; } input, textarea { background: #232a37 !important; color: #b4becd !important; border-color: #3a4555 !important; }';"
                          L"  document.head.appendChild(style);"
                          L"}";
        
        webview->ExecuteScript(css.c_str(), nullptr);
    }

static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
        PrivacyBrowser* browser = reinterpret_cast<PrivacyBrowser*>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
        
        switch (msg) {
            case WM_CREATE: {
                LPCREATESTRUCT pcs = reinterpret_cast<LPCREATESTRUCT>(lParam);
                SetWindowLongPtr(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(pcs->lpCreateParams));
                return 0;
            }
            case WM_SIZE: {
                if (browser && browser->controller) {
                    RECT bounds;
                    GetClientRect(hwnd, &bounds);
                    browser->controller->put_Bounds(bounds);
                }
                return 0;
            }
            case WM_DESTROY:
                PostQuitMessage(0);
                return 0;
            case WM_PAINT: {
                PAINTSTRUCT ps;
                HDC hdc = BeginPaint(hwnd, &ps);
                RECT rect;
                GetClientRect(hwnd, &rect);
                
                // Soft night glow border effect
                HBRUSH softBrush = CreateSolidBrush(NIGHT_SOFT);
                SelectObject(hdc, softBrush);
                Rectangle(hdc, rect.left, rect.top, rect.right, rect.bottom);
                DeleteObject(softBrush);
                
                SetTextColor(hdc, TEXT_COLOR);
                SetBkMode(hdc, TRANSPARENT);
                DrawTextW(hdc, L"ShadowBrowse - Zero Cloud Tracking • All Local", -1, 
                         &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
                EndPaint(hwnd, &ps);
                return 0;
            }
        }
        return DefWindowProcW(hwnd, msg, wParam, lParam);
    }

void Run() {
        MSG msg;
        while (GetMessage(&msg, NULL, 0, 0)) {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
};

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR, int) {
    // Force high privacy Windows settings
    SetEnvironmentVariableW(L"WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS", 
        L"--disable-features=OptimizationHints,InterestFeed,MediaRouter,WebRTC,"
        L"AutofillServerCommunication --disable-sync --no-first-run --disable-background-networking");
    
    PrivacyBrowser browser;
    if (browser.Initialize(hInstance)) {
        browser.Run();
    }
    return 0;
}