/// <summary>
/// Validate refresh token
/// </summary>
/// <returns>if token is valid - (true, null), otherwise (false, [reason])</returns>
private async Task <bool> ValidaateRefreshToken(string userName, string sessionId, string refreshTokenToVerify)
{
IAuthToken savedRefreshToken = await _userStore.GetRefreshToken(userName, sessionId); //retrieve the refresh token from data storage
if (savedRefreshToken == null ||
savedRefreshToken.Token != refreshTokenToVerify ||
savedRefreshToken.ExpireDate < DateTime.UtcNow)
{
return(false);
}
return(true);
}