Handle 2FA authentication in Octokit.net

octokit2fa.linq

<Query Kind="Program">
  <NuGetReference>Octokit</NuGetReference>
  <Namespace>Octokit</Namespace>
  <Namespace>System.Threading.Tasks</Namespace>
</Query>

static string product = "Octokit-LINQPad-2FA-Demo";
IGitHubClient _Client = new GitHubClient(new ProductHeaderValue(product));
string clientId = "client-id-of-your-registered-github-application";
string clientSecret = "client-secret-of-your-registered-github-application";

async Task Main()
{
	await Login();
}

private async Task Login()
{
	string Username = Util.ReadLine();
	string Password = Util.GetPassword("github password", true);

	_Client.Connection.Credentials = new Credentials(Username, Password);

	var newAuthorization = new NewAuthorization
	{
		Scopes = new List<string> { "user", "repo" },
		Note = product
	};

	try
	{
		var authorization = await _Client.Authorization.GetOrCreateApplicationAuthentication(
			clientId,
			clientSecret,
			newAuthorization);

		_Client.Connection.Credentials = new Credentials(authorization.Token);

		"Successfully authenticated with username password".Dump();
	}
	catch (TwoFactorRequiredException)
	{
		await AuthenticateWithOTP();
	}
	catch (Exception ex)
	{
		throw ex;
	}
}

private async Task AuthenticateWithOTP()
{
	string OneTimePassword = Util.GetPassword("github otp", true);
	
	var newAuthorization = new NewAuthorization
	{
		Scopes = new List<string> { "user", "repo" },
		Note = product
	};

	try
	{
		var authorization = await _Client.Authorization.GetOrCreateApplicationAuthentication(
			clientId,
			clientSecret,
			newAuthorization,
			OneTimePassword);

		_Client.Connection.Credentials = new Credentials(authorization.Token);

		"Successfully authenticated with One Time Password".Dump();
	}
	catch (Exception ex)
	{
		throw ex;
	}
}