/// <summary>
/// Refreshes the access token if (a) there is a refresh token, and (b) there is not an unexpired accesstoken
/// </summary>
/// <returns>True if the update happened and was successful</returns>
public async Task <bool> RefreshAccessToken()
{
return(await Task.Run <bool>(() =>
{
// Don't refresh if no refresh token, or if current access token is still valid
if (CheckAccessToken() || String.IsNullOrEmpty(AuthState.RefreshToken))
{
return false;
}
WebServerClient client = Client();
try
{
client.RefreshAuthorization(AuthState);
}
catch (DotNetOpenAuth.Messaging.ProtocolException ex)
{
GDriveError error = JsonConvert.DeserializeObject <GDriveError>(ExtractResponseString(ex.InnerException as WebException));
if (error == null)
{
throw;
}
else if (error.error.CompareCurrentCultureIgnoreCase("invalid_grant") == 0)
{
throw new MyFlightbookException(Branding.ReBrand(Resources.LocalizedText.GoogleDriveBadAuth), ex);
}
else
{
throw new MyFlightbookException(String.Format(CultureInfo.CurrentCulture, "Error from Google Drive: {0} {1} {2}", error.error, error.error_description, error.error_uri), ex);
}
}
return true;
}));
}
private static void ThrowGDriveError(Exception ex)
{
if (ex == null)
{
return;
}
GDriveError error = JsonConvert.DeserializeObject <GDriveError>(ExtractResponseString(ex.InnerException as WebException));
if (error == null)
{
throw new MyFlightbookException("Unknown error refreshing access token", ex);
}
else if (error.error.CompareCurrentCultureIgnoreCase("invalid_grant") == 0)
{
throw new UnauthorizedAccessException(Branding.ReBrand(Resources.LocalizedText.GoogleDriveBadAuth), ex);
}
else
{
throw new MyFlightbookException(String.Format(CultureInfo.CurrentCulture, "Error from Google Drive: {0} {1} {2}", error.error, error.error_description, error.error_link), ex);
}
}
