v2rayN/v2rayN/v2rayN.Desktop/Views/SudoPasswordInputView.axaml.cs

using Avalonia.Controls;
using Avalonia.Threading;
using CliWrap.Buffered;
using DialogHostAvalonia;

namespace v2rayN.Desktop.Views;

public partial class SudoPasswordInputView : UserControl
{
    public SudoPasswordInputView()
    {
        InitializeComponent();

        this.Loaded += (s, e) => txtPassword.Focus();

        btnSave.Click += async (_, _) => await SavePasswordAsync();

        btnCancel.Click += (_, _) =>
        {
            DialogHost.Close(null);
        };
    }

    private async Task SavePasswordAsync()
    {
        if (txtPassword.Text.IsNullOrEmpty())
        {
            txtPassword.Focus();
            return;
        }

        var password = txtPassword.Text;
        btnSave.IsEnabled = false;

        try
        {
            // Verify if the password is correct
            if (await CheckSudoPasswordAsync(password))
            {
                // Password verification successful, return password and close dialog
                await Dispatcher.UIThread.InvokeAsync(() =>
                {
                    DialogHost.Close(null, password);
                });
            }
            else
            {
                // Password verification failed, display error and let user try again
                NoticeHandler.Instance.Enqueue(ResUI.SudoIncorrectPasswordTip);
                txtPassword.Focus();
            }
        }
        catch (Exception ex)
        {
            Logging.SaveLog("SudoPassword", ex);
        }
        finally
        {
            btnSave.IsEnabled = true;
        }
    }

    private async Task<bool> CheckSudoPasswordAsync(string password)
    {
        try
        {
            // Use sudo echo command to verify password
            var arg = new List<string>() { "-c", "sudo -S -k -p '' echo SUDO_CHECK" };
            var result = await CliWrap.Cli
                .Wrap(Global.LinuxBash)
                .WithArguments(arg)
                .WithStandardInputPipe(CliWrap.PipeSource.FromString(password))
                .ExecuteBufferedAsync();

            return result.ExitCode == 0;
        }
        catch (Exception ex)
        {
            Logging.SaveLog("CheckSudoPassword", ex);
            return false;
        }
    }
}