This series of slides describes how to develop a twitter application. This slide contains OAuth and its programming with Twitter4J.

1. Linked Data &
Semantic Web
Technology
Development of
Twitter Applications
Part 3. OAuth
Dr. Myungjin Lee

2. Twitter4J
• What is Twitter4J?
– an unofficial Java library for the Twitter API
– easily to integrate your Java application with the
Twitter service
– http://twitter4j.org/en/index.html
• Features
– 100% Pure Java - works on any Java Platform version
5 or later
– Android platform and Google App Engine ready
– Zero dependency : No additional jars required
– Built-in OAuth support
– Out-of-the-box gzip support
– 100% Twitter API 1.1 compatible
• API Support matrix
– http://twitter4j.org/en/api-support.html
2
Linked Data & Semantic Web Technology

3. OAuth
• What is OAuth?
– an open standard for authorization
– a method for clients to access server resources on
behalf of a resource owner
– a process for end-users to authorize third-party access
to their server resources without sharing their
credentials
• Twitter’s OAuth
– OAuth v1.0a to provide authorized access to Twitter
API
– using HMAC-SHA1 signature
3
Linked Data & Semantic Web Technology

4. OAuth Process for Desktop Application
4
Linked Data & Semantic Web Technology

5. Registering Your Application
• https://dev.twitter.com/apps/new
your application name
your application description
your application’s publicly
accessible home page
webpage URL where twitter returns
after successfully authenticating
Linked Data & Semantic Web Technology

6. Registering Your Application
Consumer Key and Secret to get user’s Access Token
6
Linked Data & Semantic Web Technology

7. Application type
• Read only
– Read Tweets from your timeline.
– See who you follow.
• Read and Write
– Read Tweets from your timeline.
– See who you follow, and follow new people.
– Update your profile.
– Post Tweets for you.
• Read, Write and Access direct messages
– Read Tweets from your timeline.
– See who you follow, and follow new people.
– Update your profile.
– Post Tweets for you.
– Access your direct messages.
7
Linked Data & Semantic Web Technology

8. Primary Classes and Interfaces of Twitter4J
• TwitterFactory Class
– A factory class for Twitter
• Twitter Interface
– basic interface to use all of APIs
• AccessToken Class
– Representing authorized Access Token which is
passed to the service provider in order to access
protected resources
8
Linked Data & Semantic Web Technology

9. Getting Access Token
1. // The factory instance is re-useable and thread safe.
2. Twitter twitter = TwitterFactory.getSingleton();
3. twitter.setOAuthConsumer("[consumer key]", "[consumer secret]");
4. RequestToken requestToken = null;
5. try {
6. requestToken = twitter.getOAuthRequestToken();
7. } catch (TwitterException e) {
8. // TODO Auto-generated catch block
9. e.printStackTrace();
10. }
11. AccessToken accessToken = null;
12. BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
13. while (null == accessToken) {
14. System.out.println("Open the following URL and grant access to your account:");
15. System.out.println(requestToken.getAuthorizationURL());
16. System.out.print("Enter the PIN(if aviailable) or just hit enter.[PIN]:");
17. String pin = new String();
18. try {
19. pin = br.readLine();
20. } catch (IOException e) {
21. // TODO Auto-generated catch block
22. e.printStackTrace();
23. }
24. try {
25. if (pin.length() > 0) {
26. accessToken = twitter.getOAuthAccessToken(requestToken, pin);
27. } else {
28. accessToken = twitter.getOAuthAccessToken();
29. }
30. } catch (TwitterException te) {
31. if (401 == te.getStatusCode()) {
32. System.out.println("Unable to get the access token.");
33. } else {
34. te.printStackTrace();
35. }
36. }
37. }
38. // persist to the accessToken for future reference.
39. try {
40. storeAccessToken(twitter.verifyCredentials().getId(), accessToken);
41. } catch (TwitterException e) {
42. // TODO Auto-generated catch block
43. e.printStackTrace();
44. }
9
Linked Data & Semantic Web Technology

10. Getting Access Token
1. private static void storeAccessToken(long useId, AccessToken accessToken) {
2. // store accessToken.getToken() and accessToken.getTokenSecret()
3. System.out.println("User ID: " + useId);
4. System.out.println("Access Token: " + accessToken.getToken());
5. System.out.println("Access Token Secret: "
6. + accessToken.getTokenSecret());
7. }
8. public static AccessToken loadAccessToken() {
9. String token = "[access token]";
10. String tokenSecret = "[access token secret]";
11. return new AccessToken(token, tokenSecret);
12. }
10
Linked Data & Semantic Web Technology

11. Test Code for Authentication
1. import twitter4j.IDs;
2. import twitter4j.Paging;
3. import twitter4j.Twitter;
4. import twitter4j.TwitterException;
5. import twitter4j.TwitterFactory;
6. import twitter4j.User;
7. import twitter4j.auth.AccessToken;
8. public class TwitterFriends {
9. public static void main(String args[]) {
10. Twitter twitter = TwitterFactory.getSingleton();
11. AccessToken accessToken = TwitterAccessToken.loadAccessToken();
12. twitter.setOAuthConsumer(TwitterAccessToken.consumerKey,
13. TwitterAccessToken.consumerSecret);
14. twitter.setOAuthAccessToken(accessToken);
15. IDs ids = null;
16. try {
17. ids = twitter.getFollowersIDs(-1);
18. } catch (TwitterException e) {
19. // TODO Auto-generated catch block
20. e.printStackTrace();
21. }
22. long[] idArray = ids.getIDs();
23. for (int i = 0; i < idArray.length; i++) {
24. User u = null;
25. try {
26. u = twitter.showUser(idArray[i]);
27. } catch (TwitterException e) {
28. // TODO Auto-generated catch block
29. e.printStackTrace();
30. }
31. System.out.println("Name: " + u.getName());
32. }
33. }
34. }
11
Linked Data & Semantic Web Technology

12. References
• http://en.wikipedia.org/wiki/Oauth
• http://twitter4j.org/en/index.html
• http://www.semantics.kr/?p=185
12
Linked Data & Semantic Web Technology