MtGox/API/HTTP/JavaExample

package com.mtgox.api;

import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.util.HashMap; import java.util.logging.Level; import java.util.logging.Logger; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder;

public class Client {

   protected String key;
   protected String secret;
   
   /**

• @param args the command line arguments
• /

   public static void main(String[] args) {
       Client client = new Client(
               "your key here",
               "your secret here"
       );
       HashMap<String, String> query_args = new HashMap<>();
       query_args.put("currency", "BTC");
       query_args.put("amount", "5.0");
       query_args.put("return_success", "https://mtgox.com/success");
       query_args.put("return_failure", "https://mtgox.com/failure");
       
       client.query("1/generic/private/merchant/order/create", query_args);
   }
   
   public Client(String key, String secret) {
       this.key = key;
       this.secret = secret;
   }
   
   public String query(String path, HashMap<String, String> args) {
       try {
           // add nonce and build arg list
           args.put("nonce", String.valueOf(System.currentTimeMillis()));
           String post_data = this.buildQueryString(args);
           
           // args signature
           Mac mac = Mac.getInstance("HmacSHA512");
           SecretKeySpec secret_spec = new SecretKeySpec((new BASE64Decoder()).decodeBuffer(this.secret), "HmacSHA512");
           mac.init(secret_spec);
           String signature = (new BASE64Encoder()).encode(mac.doFinal(post_data.getBytes()));

           // build URL
           URL queryUrl = new URL("https://mtgox.com/api/" + path);
           
           // create connection
           HttpURLConnection connection = (HttpURLConnection)queryUrl.openConnection();
           connection.setDoOutput(true);
           // set signature
           connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; Java Test client)");
           connection.setRequestProperty("Rest-Key", this.key);
           connection.setRequestProperty("Rest-Sign", signature.replaceAll("\n", ""));

           // write post
           connection.getOutputStream().write(post_data.getBytes());
           
           // read info
           byte buffer[] = new byte[16384];
           int len = connection.getInputStream().read(buffer, 0, 16384);
           System.out.print(new String(buffer, 0, len, "UTF-8"));
       } catch (Exception ex) {
           Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
       }
       return "foo";
   }
   
   protected String buildQueryString(HashMap<String, String> args) {
       String result = new String();
       for (String hashkey : args.keySet()) {
           if (result.length() > 0) result += '&';
           try {
               result += URLEncoder.encode(hashkey, "UTF-8") + "="
                       + URLEncoder.encode(args.get(hashkey), "UTF-8");
           } catch (Exception ex) {
               Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
           }
       }
       return result;
   }

}