/// <summary>
/// Determines if the user signed in.
/// </summary>
/// <param name="turnContext">Turn context.</param>
/// <param name="oauthConnectionName">OAuth connection name.</param>
/// <param name="state">Magic code.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>True if user is signed-in, false otherwise.</returns>
public static async Task <bool> IsUserSignedInAsync(this ITurnContext <IInvokeActivity> turnContext, string oauthConnectionName, string state, CancellationToken cancellationToken)
{
var tokenResponse = await turnContext.GetTokenResponseAsync(oauthConnectionName, state, cancellationToken);
return(!string.IsNullOrEmpty(tokenResponse?.Token));
}
