Implementation of Kraken API in Java

Question

So I currently working on an implementation of the Kraken API for Java. I am using this sample code I found on http://pastebin.com/nHJDAbH8.

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Answer 1

Here is a working example:

static String key = "---myKey---";
static String secret = "---mySecret---";
String nonce, signature, data, path;
static String domain = "https://api.kraken.com";

void account_balance() {
    nonce = String.valueOf(System.currentTimeMillis());
    data = "nonce=" + nonce;
    path = "/0/private/Balance";
    calculateSignature();
    String answer = post(domain + path, data);
    // on empty accounts, returns {"error":[],"result":{}}
    // this is a known Kraken bug
    ...
}

String post(String address, String output) {
    String answer = "";
    HttpsURLConnection c = null;
    try {
        URL u = new URL(address); 
        c = (HttpsURLConnection)u.openConnection();
        c.setRequestMethod("POST");
        c.setRequestProperty("API-Key", key);
        c.setRequestProperty("API-Sign", signature);
        c.setDoOutput(true);
        DataOutputStream os = new DataOutputStream(c.getOutputStream());
        os.writeBytes(output);
        os.flush();
        os.close();
        BufferedReader br = null;
        if(c.getResponseCode() >= 400) {
            System.exit(1);
        }
        br = new BufferedReader(new InputStreamReader((c.getInputStream())));
        String line;
        while ((line = br.readLine()) != null)
            answer += line;
    } catch (Exception x) {
        System.exit(1);
    } finally {
        c.disconnect();
    }
    return answer;        
}

void calculateSignature() {
    signature = "";
    try {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update((nonce + data).getBytes());
        Mac mac = Mac.getInstance("HmacSHA512");
        mac.init(new SecretKeySpec(Base64.decodeBase64(secret.getBytes()), "HmacSHA512"));
        mac.update(path.getBytes());
        signature = new String(Base64.encodeBase64(mac.doFinal(md.digest())));
    } catch(Exception e) {}
    return;
}