Android Open Source - NewAndroidTwitter Oauth Util

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License

The source code is released under:

Apache License

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Java Source Code

package net.londatiga.android.twitter.oauth;
/* w w  w  .  jav  a 2 s .com*/
import java.security.MessageDigest;
import java.security.SecureRandom;

/**
 * Oauth utils.
 * 
 * @author Lorensius W. L. T <lorenz@londatiga.net>
 *
 */
public class OauthUtil {
  public static final String SIGNATURE_METHOD = "HMAC-SHA1";
  public static final String OAUTH_VERSION = "1.0";
  public static final String OAUTH_VERIFIER = "oauth_verifier";
  public static final String OAUTH_CALLBACK_CONFIRMED = "oauth_callback_confirmed";
  public static final String OAUTH_TOKEN = "oauth_token";
  public static final String OAUTH_TOKEN_SECRET = "oauth_token_secret";
  public static final String USER_ID = "user_id";
  public static final String SCREEN_NAME = "screen_name";
  
  public static final String OAUTH_REQUEST_URL = "https://api.twitter.com/oauth/request_token";  
  public static final String OAUTH_AUTHENTICATION_URL = "https://api.twitter.com/oauth/authenticate";
  public static final String OAUTH_AUTHORIZATION_URL = "https://api.twitter.com/oauth/authorize";
  public static final String OAUTH_ACCESSTOKEN_URL = "https://api.twitter.com/oauth/access_token";
  
  public static String createNonce() {
    String nonce = "";
    
    try {
      SecureRandom prng   = SecureRandom.getInstance("SHA1PRNG");
      String randomNum  = String.valueOf(prng.nextInt());

      MessageDigest sha   = MessageDigest.getInstance("SHA-1");
      byte[] result     =  sha.digest( randomNum.getBytes() );
      nonce         = OauthUtil.hexEncode(result);
    } catch (Exception e) {      
    }
    
       return nonce;
  }
  
  public static String hexEncode( byte[] aInput){
      StringBuilder result = new StringBuilder();
      
      char[] digits = {'0', '1', '2', '3', '4','5','6','7','8','9','a','b','c','d','e','f'};
      
      for ( int idx = 0; idx < aInput.length; ++idx) {
        byte b = aInput[idx];
        
        result.append( digits[ (b&0xf0) >> 4 ] );
        result.append( digits[ b&0x0f] );
      }
      
      return result.toString();
  }
  
  public static String getTimeStamp() {
    return String.valueOf(System.currentTimeMillis()/1000);
  }
}

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