Here is an example. Make sure you add a string setting called RefreshToken and reference System.Security or find another way to safely store the refresh token.
private static byte[] aditionalEntropy = { 1, 2, 3, 4, 5 };
private static IAuthorizationState GetAuthorization(NativeApplicationClient arg)
{
// Get the auth URL:
IAuthorizationState state = new AuthorizationState(new[] { PlusService.Scopes.PlusMe.GetStringValue() });
state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
string refreshToken = LoadRefreshToken();
if (!String.IsNullOrWhiteSpace(refreshToken))
{
state.RefreshToken = refreshToken;
if (arg.RefreshToken(state))
return state;
}
Uri authUri = arg.RequestUserAuthorization(state);
// Request authorization from the user (by opening a browser window):
Process.Start(authUri.ToString());
Console.Write(" Authorization Code: ");
string authCode = Console.ReadLine();
Console.WriteLine();
// Retrieve the access token by using the authorization code:
var result = arg.ProcessUserAuthorization(authCode, state);
StoreRefreshToken(state);
return result;
}
private static string LoadRefreshToken()
{
return Encoding.Unicode.GetString(ProtectedData.Unprotect(Convert.FromBase64String(Properties.Settings.Default.RefreshToken), aditionalEntropy, DataProtectionScope.CurrentUser));
}
private static void StoreRefreshToken(IAuthorizationState state)
{
Properties.Settings.Default.RefreshToken = Convert.ToBase64String(ProtectedData.Protect(Encoding.Unicode.GetBytes(state.RefreshToken), aditionalEntropy, DataProtectionScope.CurrentUser));
Properties.Settings.Default.Save();
}