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Google / OAuth 2 - automatic login

I play a little with OAuth 2.0 in combination with some Google APIs. Although the authorization process is quite simple, before starting authorization, I had a problem with automatic authorization.

So:

1. Authorization is done for the first time. (user grants access, I get the token etc etc)
2. User exits the application
3. User starts the application again
4. How to logon automatically here?

At point 4, I have a refresh_token, so I just need to request a new token using this request_token. But I still get 401 Unauthorized results for my calls.

So what I'm trying to do is that my application can log in quietly so that the user does not provide access every time.

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2 answers

You must update the OAuth 2.0 token using the following query:

POST /o/oauth2/token HTTP/1.1
Host: accounts.google.com
Content-Type: application/x-www-form-urlencoded

client_id=21302922996.apps.googleusercontent.com&
client_secret=XTHhXh1SlUNgvyWGwDk1EjXB&
refresh_token=1/6BMfW9j53gdGImsixUH6kU5RsR4zwI9lUVX-tqf8JXQ&
grant_type=refresh_token

Google OAuth 2.0.

curl, :

curl -d client_id=$CLIENT_ID -d client_secret=$CLIENT_SECRET -d refresh_token=$REFRESH_TOKEN -d grant_type=refresh_token https://accounts.google.com/o/oauth2/token

{"access_token":"$ACCESS_TOKEN","token_type":"Bearer","expires_in":3600}
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.NET Google.GData.Client. , , , , GOAuthRequestFactory.

public GOAuthRequestFactory GetGoogleOAuthFactory(int id)
    {
        // build the base parameters
        OAuthParameters parameters = new OAuthParameters
        {
            ConsumerKey = kConsumerKey,
            ConsumerSecret = kConsumerSecret
        };

        // check to see if we have saved tokens and set
        var tokens = (from a in context.GO_GoogleAuthorizeTokens where a.id = id select a);
        if (tokens.Count() > 0)
        {
            GO_GoogleAuthorizeToken token = tokens.First();
            parameters.Token = token.Token;
            parameters.TokenSecret = token.TokenSecret;
        }

        // now build the factory
        return new GOAuthRequestFactory("somevalue", kApplicationName, parameters);
    }

factory, api, , - :

// authenticate to the google calendar
CalendarService service = new CalendarService(kApplicationName);
service.RequestFactory = GetGoogleOAuthFactory([user id]);

// add from google doc record
EventEntry entry = new EventEntry();
entry.Title.Text = goEvent.Title;
entry.Content.Content = GoogleCalendarEventDescription(goEvent);

When eventTime = new When(goEvent.StartTime, goEvent.EndTime.HasValue ? goEvent.EndTime.Value : DateTime.MinValue, goEvent.AllDay);
entry.Times.Add(eventTime);

// add the location
Where eventLocation = new Where();
eventLocation.ValueString = String.Format("{0}, {1}, {2} {3}", goEvent.Address, goEvent.City, goEvent.State, goEvent.Zip);
entry.Locations.Add(eventLocation);

Uri postUri = new Uri(kCalendarURL);

// set the request and receive the response
EventEntry insertedEntry = service.Insert(postUri, entry);
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