(Java) Twitter - Application Only Authentication

Demonstrates how to get a Twitter OAuth2 token for application-only authentication.

This example is deprecated and no longer valid.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // It requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Note: Define your Twitter apps at https://apps.twitter.com/

    // We're going to send an HTTPS POST that looks like this:

    // POST /oauth2/token HTTP/1.1
    // Host: api.twitter.com
    // User-Agent: My Twitter App v1.0.23
    // Authorization: Basic eHZ6MWV2RlM0d0VFUFRHRUZQSEJvZzpMOHFxOVBaeVJn
    //                      NmllS0dFS2hab2xHQzB2SldMdzhpRUo4OERSZHlPZw==
    // Content-Type: application/x-www-form-urlencoded;charset=UTF-8
    // Content-Length: 29
    // Accept-Encoding: gzip
    // 
    // grant_type=client_credentials

    // Update these values with your consumer key and secret (also known as API key and API secret).
    String consumerKey = "TWITTER_CONSUMER_KEY";
    String consumerSecret = "TWITTER_CONSUMER_SECRET";

    CkHttp http = new CkHttp();

    http.put_BasicAuth(true);
    http.put_Login(consumerKey);
    http.put_Password(consumerSecret);

    CkHttpRequest req = new CkHttpRequest();
    req.AddParam("grant_type","client_credentials");

    CkHttpResponse resp = http.PostUrlEncoded("https://api.twitter.com/oauth2/token",req);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    System.out.println("Response Status Code: " + resp.get_StatusCode());

    if (resp.get_StatusCode() != 200) {
        System.out.println("Expected a 200 response status code for success.");
        System.out.println(resp.bodyStr());
        return;
        }

    // We should get a JSON response like this:

    // {
    //     "token_type":"bearer",
    //     "access_token":"..."
    // }

    CkJsonObject json = new CkJsonObject();
    json.Load(resp.bodyStr());

    System.out.println("Access token = " + json.stringOf("access_token"));
  }
}