/src/se/istenes/twitter/utils/TwitterAuth.java

  1package se.istenes.twitter.utils;
  2
  3import java.io.InputStream;
  4
  5import org.brickred.socialauth.AuthProvider;
  6import org.brickred.socialauth.SocialAuthConfig;
  7import org.brickred.socialauth.android.DialogListener;
  8import org.brickred.socialauth.android.SocialAuthAdapter;
  9import org.brickred.socialauth.android.SocialAuthAdapter.Provider;
 10import org.brickred.socialauth.android.SocialAuthError;
 11
 12import twitter4j.Twitter;
 13import twitter4j.TwitterFactory;
 14import twitter4j.conf.ConfigurationBuilder;
 15import android.content.Context;
 16import android.content.SharedPreferences;
 17import android.os.Bundle;
 18
 19public class TwitterAuth {
 20	
 21	private Context ctx;
 22	private SocialAuthAdapter adapter;
 23	private static TwitterFactory factory;
 24	public final String AUTH_SETTINGS = "auth_settings";
 25	
 26	/***
 27	 * Creates a dialog for the user to authenticate
 28	 * @param ctx The current activity context
 29	 * @param tal A listener to check for successes or fails
 30	 */
 31	public TwitterAuth(final Context ctx, final TwitterAuthListener tal) {
 32		//Store Context to access shared preferences later
 33		this.ctx = ctx;
 34		final SharedPreferences preferences = ctx.getSharedPreferences(AUTH_SETTINGS, Context.MODE_PRIVATE);
 35		
 36		adapter = new SocialAuthAdapter(new DialogListener() {
 37			@Override
 38			public void onError(SocialAuthError arg0) {
 39				preferences.edit().clear().commit();
 40				tal.Fail(arg0.getInnerException());
 41			}
 42			
 43			@Override
 44			public void onComplete(Bundle arg0) {
 45				AuthProvider provider = adapter.getCurrentProvider();
 46		    	SocialAuthConfig config = new SocialAuthConfig();
 47		    	InputStream input;
 48				try {
 49					//piggybacks the consumer properties from the oauth_consumer file
 50					input = ctx.getAssets().open("oauth_consumer.properties");
 51			    	config.load(input);
 52				} catch (Exception e) {
 53					e.printStackTrace();
 54				}
 55				
 56				//Sets up the preferences so we don't need to authenticate again
 57				preferences.edit()
 58				.putString("consumer_key", config.getApplicationProperties().getProperty("twitter.com.consumer_key"))
 59				.putString("consumer_secret", config.getApplicationProperties().getProperty("twitter.com.consumer_secret"))
 60				.putString("access_key", provider.getAccessGrant().getKey())
 61				.putString("access_secret", provider.getAccessGrant().getSecret())
 62				.commit();
 63		
 64				tal.Success(setUpTwitter());
 65			}
 66			
 67			@Override
 68			public void onCancel() {
 69				preferences.edit().clear().commit();
 70				tal.Fail(new Exception("user aborted"));
 71			}
 72		});
 73		
 74		if(!preferences.contains("consumer_key")||
 75				!preferences.contains("consumer_secret")||
 76				!preferences.contains("access_key")||
 77				!preferences.contains("access_secret")) {			
 78			//Bring up the authorization dialog
 79			adapter.authorize(ctx, Provider.TWITTER);			
 80		} else {
 81			tal.Success(setUpTwitter());
 82		}
 83	}
 84	
 85	/***
 86	 * Sets up twitter4j with all the required parameters such as
 87	 * consumer and accesstokens. Also stores them privatly to the
 88	 * shared preferences.
 89	 * @return a new instance of twitter if successful.
 90	 * <br />NOTE: This instance is synchronous and must be used with AsyncTask
 91	 */
 92	private Twitter setUpTwitter() {
 93		//loads the keys and secrets
 94		SharedPreferences settings = ctx.getSharedPreferences(AUTH_SETTINGS, Context.MODE_PRIVATE);
 95		
 96		//Sets up twitter4j, set debug to false when deploying application
 97    	ConfigurationBuilder cb = new ConfigurationBuilder();
 98    	cb.setDebugEnabled(true)
 99    	  .setOAuthConsumerKey(settings.getString("consumer_key", ""))
100    	  .setOAuthConsumerSecret(settings.getString("consumer_secret", ""))
101    	  .setOAuthAccessToken(settings.getString("access_key", ""))
102    	  .setOAuthAccessTokenSecret(settings.getString("access_secret", ""));
103    	
104    	//builds a new factory based on the configurations, this is used to create a twitter instance
105		factory = new TwitterFactory(cb.build());
106		return factory.getInstance();
107	}
108	
109	/***
110	 * Get's the twitter "singleton"
111	 * @return Authorized twitter instance
112	 */
113	public static Twitter getInstance() {
114		return factory.getInstance();
115	}
116}