用Java访问Poloniex HTTP

Question

我尝试连接到poloniex.com API https://poloniex.com/support/api/，它说：

(对交易API的所有调用都通过HTTP发送到https://poloniex.com/tradingApi，并且必须包含以下标头：

• 密钥-你的API密钥。
• 签名-根据HMAC- The 512方法，查询的POST数据由您的密钥的“机密”签名。

此外，所有查询都必须包含"nonce“POST参数。nonce参数是一个整数，必须始终大于以前使用的整数。)

但我总是

{"error":"Invalid
API key\/secret pair."}

我的hmac512Digest很好，我已经检查过了。

我的代码一定有问题。

有人能帮忙吗？

   public class Pol2 {

    public static String POLONIEX_SECRET_KEY = "12345"; 
    public static String POLONIEX_API_KEY = "ABX"; 


    public static void main(String[] args) {
        try {
            accessPoloniex();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static final void accessPoloniex() throws IOException {

        final String nonce = String.valueOf(System.currentTimeMillis());

        String connectionString = "https://poloniex.com/tradingApi";

        String queryArgs = "command=returnBalances";

        String hmac512 = hmac512Digest(queryArgs, POLONIEX_SECRET_KEY);

        // Produce the output
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        Writer writer = new OutputStreamWriter(out, "UTF-8");
        writer.append(queryArgs);
        writer.flush();

        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost post = new HttpPost(connectionString);
        post.addHeader("Key", POLONIEX_API_KEY); //or setHeader?
        post.addHeader("Sign", hmac512);  //or setHeader?

        post.setEntity(new ByteArrayEntity(out.toByteArray()));
        List<NameValuePair> params = new ArrayList<>();

        params.add(new BasicNameValuePair("command", "returnBalances"));
        params.add(new BasicNameValuePair("nonce", nonce));

        CloseableHttpResponse response = null;
        Scanner in = null;
        try {
            post.setEntity(new UrlEncodedFormEntity(params));
            response = httpClient.execute(post);
            HttpEntity entity = response.getEntity();
            in = new Scanner(entity.getContent());
            while (in.hasNext()) {
                System.out.println(in.next());
            }
            EntityUtils.consume(entity);
        } finally {
            in.close();
            response.close();
        }
    }
}

Answer 1

我查看了他们在页面上链接到的Python示例。nonce参数必须与命令一起添加MAC‘，最后的MAC以十六进制编码格式追加：

String queryArgs = "command=returnBalances&nonce=" + nonce;
String hmac512 = hmac512Digest(queryArgs, POLONIEX_SECRET_KEY);

另外，以下几点

ByteArrayOutputStream out = new ByteArrayOutputStream();
Writer writer = new OutputStreamWriter(out, "UTF-8");
writer.append(queryArgs);
writer.flush();
//...
post.setEntity(new ByteArrayEntity(out.toByteArray()));

可以被还原为

post.setEntity(new ByteArrayEntity(queryArgs.getBytes("UTF-8")));

Answer 2

我自己也和这件事做了斗争，终于开始工作了。下面是一个非常基本的工作示例：

public class PoloTest {

  public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeyException, ClientProtocolException, IOException {

    String key = "YOUR API KEY HERE";
    String secret = "YOUR API SECRET HERE";
    String url = "https://poloniex.com/tradingApi";
    String nonce = String.valueOf(System.currentTimeMillis());
    String queryArgs = "command=returnBalances&nonce=" + nonce;

    Mac shaMac = Mac.getInstance("HmacSHA512");
    SecretKeySpec keySpec = new SecretKeySpec(secret.getBytes(), "HmacSHA512");
    shaMac.init(keySpec);
    final byte[] macData = shaMac.doFinal(queryArgs.getBytes());
    String sign = Hex.encodeHexString(macData);

    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpPost post = new HttpPost(url);
    post.addHeader("Key", key); 
    post.addHeader("Sign", sign);

    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("command", "returnBalances"));
    params.add(new BasicNameValuePair("nonce", nonce));
    post.setEntity(new UrlEncodedFormEntity(params));

    CloseableHttpResponse response = httpClient.execute(post);
    HttpEntity responseEntity = response.getEntity();
    System.out.println(response.getStatusLine());
    System.out.println(EntityUtils.toString(responseEntity));
  }

}

Answer 3

现在的参数必须和命令一起修改.如果散列是一个单向函数，而Polo不知道我现在可以选择什么(或者，如果我使用UTC)，那么Polo如何从我发送的内容中提取任何有意义的内容。