Question

Has anyone use any good Java API for four square oauth ? I am looking for something that is thread safe ?

Cheers,

Answer 1

I started by using foursquare4j, but was unable to get it to successfully retrieve an access token, which is the final step needed before calling signing calls to the Foursquare API.
So I switched to using signpost to get through the authentication bit and get an access token and secret, and then used foursquare4j as it encapsulates the API as a very nice object model.
I don’t know if signpost or foursquare4j are inherently thread safe – you could ask that question in their forums.
Below is a flatten version of the code I am using to authentication my App.
I’m using the Play framework – authorize() receives the initial request for authentication, and oauth() is where foursquare redirects to once the user has allowed access.

public class Foursquare extends Controller {

    static final String FOURSQUARE_OAUTH_REQUEST_TOKEN = "http://foursquare.com/oauth/request_token";
    static final String FOURSQUARE_OAUTH_ACCESS_TOKEN = "http://foursquare.com/oauth/access_token";
    static final String FOURSQUARE_OAUTH_AUTHORIZE = "http://foursquare.com/oauth/authorize";
    static final String CONSUMER_KEY = "N4FKW2GFLMU1UGR3DDQYE4IGJQRGID1JFXYPJS3XFLZN3EU6";
    static final String CONSUMER_SECRET = "DDGHBF25J3RJDD4N4QC2CMRF8YMA1CG94OGFRPTY4RQNLMVH";


    // Handle Request for foursquare Authorization
    public static void authorize() throws OAuthMessageSignerException, OAuthNotAuthorizedException, OAuthExpectationFailedException, OAuthCommunicationException {

        oauth.signpost.OAuthProvider provider = new DefaultOAuthProvider(FOURSQUARE_OAUTH_REQUEST_TOKEN, FOURSQUARE_OAUTH_ACCESS_TOKEN,FOURSQUARE_OAUTH_AUTHORIZE);
        oauth.signpost.OAuthConsumer consumer = new DefaultOAuthConsumer(CONSUMER_KEY,CONSUMER_SECRET);
        String authURL;

        authURL = provider.retrieveRequestToken(consumer,"");

        String tokenSecret = consumer.getTokenSecret();
        session.put("secret", tokenSecret);
        redirect(authURL);
    }

    // Handle call back from foursquare after user Accepts
    public static void oauth() throws IOException, OAuthMessageSignerException, OAuthNotAuthorizedException, OAuthExpectationFailedException, OAuthCommunicationException {

        oauth.signpost.OAuthProvider provider = new DefaultOAuthProvider(FOURSQUARE_OAUTH_REQUEST_TOKEN, FOURSQUARE_OAUTH_ACCESS_TOKEN,FOURSQUARE_OAUTH_AUTHORIZE);
        oauth.signpost.OAuthConsumer consumer = new DefaultOAuthConsumer(CONSUMER_KEY,CONSUMER_SECRET);
        String secret = session.get("secret");
        String pinCode = params.get("oauth_token");
        consumer.setTokenWithSecret(pinCode, secret);
        provider.retrieveAccessToken(consumer, pinCode);

        // Get the access token and secret
        String token = consumer.getToken();
        String tokenSecret = consumer.getTokenSecret();

        // Set foursquare4j Credentials
        foursquare4j.type.Credentials credentials = new Credentials();
        credentials.setTokenSecret(tokenSecret);
        credentials.setAccessToken(token);

        foursquare4j.oauth.OAuthConsumer newConsumer = new OAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);

        foursquare4j.oauth.FoursquareOAuthImpl fs = new FoursquareOAuthImpl(newConsumer, credentials);

        try {
            // Get last 50 checkins
            Checkins checkins = fs.history("50", "");

            render(checkins);
        } catch (FoursquareException e) {
            e.printStackTrace();
        }
    }
}