com.codegoogle.twitterandroid.TwitterApp.java Source code

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Here is the source code for com.codegoogle.twitterandroid.TwitterApp.java

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.codegoogle.twitterandroid;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLDecoder;

import oauth.signpost.OAuthProvider;
import oauth.signpost.basic.DefaultOAuthProvider;
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.User;
import twitter4j.auth.AccessToken;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.view.Window;

public final class TwitterApp {
    //
    // This code is heavily based on
    // http://abhinavasblog.blogspot.com/2011/06/for-all-my-code-thirsty-friends-twitter.html
    //
    private final Context context;
    private final Twitter twitter;
    private final TwitterSession session;
    private final CommonsHttpOAuthConsumer httpOauthConsumer;
    private final OAuthProvider httpOauthprovider;
    private final String consumerKey;
    private final String secretKey;
    private final ProgressDialog progressDialog;
    private TwitterAuthListener listener;
    private AccessToken accessToken;

    public static final String CALLBACK_URL = "twitterapp://connect";
    private static final String TWITTER_ACCESS_TOKEN_URL = "https://api.twitter.com/oauth/access_token";
    private static final String TWITTER_AUTHORZE_URL = "https://api.twitter.com/oauth/authorize";
    private static final String TWITTER_REQUEST_URL = "https://api.twitter.com/oauth/request_token";

    public TwitterApp(Context context, String consumerKey, String secretKey) {
        this.context = context;
        this.consumerKey = consumerKey;
        this.secretKey = secretKey;

        twitter = new TwitterFactory().getInstance();
        session = new TwitterSession(context);
        progressDialog = new ProgressDialog(context);
        progressDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        httpOauthConsumer = new CommonsHttpOAuthConsumer(consumerKey, secretKey);

        String request_url = TWITTER_REQUEST_URL;
        String access_token_url = TWITTER_ACCESS_TOKEN_URL;
        String authorize_url = TWITTER_AUTHORZE_URL;

        httpOauthprovider = new DefaultOAuthProvider(request_url, access_token_url, authorize_url);
        accessToken = session.getAccessToken();

        configureToken();
    }

    public void setListener(TwitterAuthListener listener) {
        this.listener = listener;
    }

    private void configureToken() {
        if (accessToken != null) {
            twitter.setOAuthConsumer(consumerKey, secretKey);
            twitter.setOAuthAccessToken(accessToken);
        }
    }

    public boolean hasAccessToken() {
        return (accessToken == null) ? false : true;
    }

    public void resetAccessToken() {
        if (accessToken != null) {
            session.resetAccessToken();

            accessToken = null;
        }
    }

    public String getUsername() {
        return session.getUsername();
    }

    public void updateStatus(String status) throws Exception {
        try {
            twitter.updateStatus(status);
        } catch (TwitterException e) {
            throw e;
        }
    }

    public void authorize() {
        progressDialog.setMessage("Initializing ...");
        progressDialog.show();

        new Thread() {
            @Override
            public void run() {
                String authUrl = "";
                int what = 1;

                try {
                    authUrl = httpOauthprovider.retrieveRequestToken(httpOauthConsumer, CALLBACK_URL);
                    what = 0;
                } catch (Exception e) {
                    e.printStackTrace();
                }
                handler.sendMessage(handler.obtainMessage(what, 1, 0, authUrl));
            }
        }.start();
    }

    public void processToken(String callbackUrl) {
        progressDialog.setMessage("Finalizing ...");
        progressDialog.show();

        final String verifier = getVerifier(callbackUrl);

        new Thread() {
            @Override
            public void run() {
                int what = 1;

                try {
                    httpOauthprovider.retrieveAccessToken(httpOauthConsumer, verifier);

                    accessToken = new AccessToken(httpOauthConsumer.getToken(), httpOauthConsumer.getTokenSecret());

                    configureToken();

                    User user = twitter.verifyCredentials();

                    session.storeAccessToken(accessToken, user.getName());

                    what = 0;
                } catch (Exception e) {
                    e.printStackTrace();
                }

                handler.sendMessage(handler.obtainMessage(what, 2, 0));
            }
        }.start();
    }

    @SuppressWarnings("deprecation")
    private String getVerifier(String callbackUrl) {
        String verifier = "";

        try {
            callbackUrl = callbackUrl.replace("twitterapp", "http");

            URL url = new URL(callbackUrl);
            String query = url.getQuery();

            String array[] = query.split("&");

            for (String parameter : array) {
                String v[] = parameter.split("=");

                if (URLDecoder.decode(v[0]).equals(oauth.signpost.OAuth.OAUTH_VERIFIER)) {
                    verifier = URLDecoder.decode(v[1]);
                    break;
                }
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

        return verifier;
    }

    private void showLoginDialog(String url) {
        final TwitterAuthListener listener = new TwitterAuthListener() {
            @Override
            public void onComplete(String value) {
                processToken(value);
            }

            @Override
            public void onError(String value) {
                TwitterApp.this.listener.onError("Failed opening authorization page");
            }
        };

        new TwitterDialog(context, url, listener).show();
    }

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            progressDialog.dismiss();

            if (msg.what == 1) {
                if (msg.arg1 == 1)
                    listener.onError("Error getting request token");
                else
                    listener.onError("Error getting access token");
            } else {
                if (msg.arg1 == 1)
                    showLoginDialog((String) msg.obj);
                else
                    listener.onComplete("");
            }
        }
    };
}