Converts key-value pair to appropriate signature for Facebook. : Http Connection « Network « Android

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Converts key-value pair to appropriate signature for Facebook.

    
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//package fb4java.util;

import java.net.URI;
import java.net.URISyntaxException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URIUtils;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.message.BasicNameValuePair;

/**
 * 
 * fb4java<br />
 * fb4java.util
 * 
 * @author Choongsan Ro
 * @version 1.0 2010. 2. 26.
 */
 class Utility {
  private final static String HASHING_METHOD = "MD5";

  private static final String DEFAULT_CHARSET = "UTF-8";

  /**
   * Converts key-value pair to appropriate signature for Facebook.
   * 
   * @param keyVal
   *            list of key-value pairs that user has supplied
   * @param apiSecret
   *            Facebook api secret
   * @return MD5 hashed signature
   */
  public static String convetToSignature(Map<String, String> keyVal,
      String apiSecret) {

    if (keyVal == null || apiSecret == null || keyVal.size() <= 0
        || apiSecret.trim().equals("")) {
      throw new IllegalArgumentException(
          "keyVal or api secret is not valid. Please Check it again.");
    }

    Iterator<Entry<String, String>> iterator = keyVal.entrySet().iterator();
    StringBuffer rslt = new StringBuffer();
    byte[] signature = null;

    while (iterator.hasNext()) {
      Entry<String, String> entry = iterator.next();
      rslt.append(entry.getKey());
      rslt.append("=");
      rslt.append(entry.getValue());
    }
    rslt.append(apiSecret);

    // convert sig to md5 hash
    try {
      MessageDigest md5 = MessageDigest.getInstance(HASHING_METHOD);
      md5.reset();
      md5.update(rslt.toString().getBytes());
      rslt.delete(0, rslt.length());

      signature = md5.digest();

      for (int i = 0; i < signature.length; i++) {
        String hex = Integer.toHexString(0xff & signature[i]);
        if (hex.length() == 1) {
          rslt.append('0');
        }
        rslt.append(hex);
      }

    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }

    return rslt.toString();
  }

  /**
   * 
   * @param keyVal
   *            list of key value pair which contains REST method's parameter
   *            and it's value.
   * @param protocol
   *            connection protocol such as http, https, etc.
   * @param server
   *            server address <br>
   *            e.g.<br>
   *            Facebook:api.facebook.com, MySpace:api.myspace.com
   * @param rscURL
   *            resource url <br>
   *            e.g.<br>
   *            Facebook:/restserver.php MySpace:/v1/users/{personId}
   * @param charset
   *            char set to be used for this URI. If it is set to null or an
   *            empty string, then it considers it's char set as UTF-8 as
   *            default.
   * @return Created URI with supplied parameters
   * @throws URISyntaxException
   */
  public static URI createURI(Map<String, String> keyVal, String protocol,
      String server, String rscURL, String signature, String charset)
      throws URISyntaxException {
    URI rslt = null;

    if (keyVal == null || keyVal.size() <= 0) {
      throw new IllegalArgumentException(
          "keyVal is invalid. Please provide with proper key value.");
    }

    if (charset == null || charset.equals("")) {
      charset = DEFAULT_CHARSET;
    }

    List<NameValuePair> qparams = new ArrayList<NameValuePair>();
    Set<String> keys = keyVal.keySet();

    for (String key : keys) {
      qparams.add(new BasicNameValuePair(key, keyVal.get(key)));
    }
    // adds signature in url parameter
    qparams.add(new BasicNameValuePair("sig", signature.toLowerCase()));

    rslt = URIUtils.createURI(protocol, server, -1, rscURL, URLEncodedUtils
        .format(qparams, charset), null);

    return rslt;
  }
}

   
    
    
    
  

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