使用API密钥和密码与交易API（Poloniex）的java连接

Question

我正在尝试连接到Poloniex交易API，它记录在这里：https://poloniex.com/support/api/

基本上，这描述了人们需要知道的一切：

All calls to the trading API are sent via HTTP POST to https://poloniex.com/tradingApi and must contain the following headers:

Key - Your API key.

Sign - The query's POST data signed by your key's "secret" according to the HMAC-SHA512 method.

Additionally, all queries must include a "nonce" POST parameter. The nonce parameter is an integer which must always be greater than the previous nonce used.

但由于某种原因，我得到了错误：无效命令。我试过各种命令，但都不管用

public static String POLONIEX_SECRET_KEY = "my secret"; //KEY
public static String POLONIEX_API_KEY = "my key"; // TODO API KEY


public static void main(String[] args) {

    try {
        accessPoloniex();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}
public static final long generateNonce(){

    Date d = new Date();
    return d.getTime();
}

public static final void accessPoloniex() throws IOException{

    String nonce = new BigDecimal(Polo2.generateNonce()).toString();

    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);


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

    post.setEntity(new ByteArrayEntity(out.toByteArray()));
    List<NameValuePair> params = new ArrayList<>();
    params.add(new BasicNameValuePair("nonce", nonce));

    CloseableHttpResponse response = null;
    Scanner in = null;
    try
    {
        post.setEntity(new UrlEncodedFormEntity(params));
        response = httpClient.execute(post);
        // System.out.println(response.getStatusLine());
        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();
    }

}

public static String hmac512Digest(String msg, String keyString) {

    Mac shaMac;
    try {
        shaMac = Mac.getInstance("HmacSHA512");
        SecretKeySpec  keySpec = new SecretKeySpec(keyString.getBytes(), "HmacSHA512");

        shaMac.init(keySpec);
        final byte[] macData = shaMac.doFinal(msg.getBytes());
        return Hex.encodeHexString(macData); //again with try/catch for InvalidKeyException

    } catch (Exception e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    } 
    return null;
}

有人看到代码中有什么问题吗

Answer 1

我想出来了：

我需要将“queryArgs”设置为“NameValuePair”，然后它就可以工作了：

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