DepotDownloader/DepotDownloader/DepotDownloaderAuthenticator.cs

using System;
using System.Threading.Tasks;
using SteamKit2.Authentication;

namespace DepotDownloader;

public class DepotDownloaderAuthenticator : IAuthenticator
{
    public Task<string> GetDeviceCodeAsync(bool previousCodeWasIncorrect)
    {
        if (previousCodeWasIncorrect)
        {
            Console.Out.WriteLine("[2FA]|[Wrong]|The previous 2-factor auth code you have provided is incorrect.");
        }

        string? code;

        do
        {
            Console.Out.Write("[2FA]|Please enter your 2 factor auth code from your authenticator app: ");
            code = Console.ReadLine()?.Trim();

            if (code == null)
            {
                break;
            }
        } while (string.IsNullOrEmpty(code));

        return Task.FromResult(code!);
    }

    public Task<string> GetEmailCodeAsync(string email, bool previousCodeWasIncorrect)
    {
        if (previousCodeWasIncorrect)
        {
            Console.Out.WriteLine("[Guard]|[Wrong]|The previous 2-factor auth code you have provided is incorrect.");
        }

        string? code;

        do
        {
            Console.Out.Write($"[Guard]|Please enter the authentication code sent to your email address: ");
            code = Console.ReadLine()?.Trim();

            if (code == null)
            {
                break;
            }
        } while (string.IsNullOrEmpty(code));

        return Task.FromResult(code!);
    }

    public Task<bool> AcceptDeviceConfirmationAsync()
    {
        Console.Out.WriteLine("[MobileApp]|Use the Steam Mobile App to confirm your sign in...");
        return Task.FromResult(true);
    }
}