Access Poloniex trading API from JAVA

flash10101

full member

Activity: 372

Merit: 130

So I added the nonce to the queryArgs, but still the same result Sad

Code:

public class Poloniex {

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

public static void main(String[] args) {

try {
accessPoloniex();
} catch (IOException e) {
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(Poloniex.generateNonce()).toString();

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

String queryArgs = "command=returnDepositAddresses&nonce="+nonce;

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.setHeader("Content-Type", "application/json");
post.setEntity(new ByteArrayEntity(queryArgs.getBytes()));
List params = new ArrayList<>();
params.add(new BasicNameValuePair("nonce", nonce));

CloseableHttpResponse response = null;
try
{
// post.setEntity(new UrlEncodedFormEntity(params));
response = httpClient.execute(post);

System.out.println(response.getStatusLine());

String result = EntityUtils.toString(response.getEntity());

System.out.println("result: "+result);
} finally
{
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
return Base64.getEncoder().encodeToString(macData);
} catch (Exception e1) {
e1.printStackTrace();
}
return null;
}
}

flash10101

full member

Activity: 372

Merit: 130

Quote from: Herbert2020 on August 24, 2016, 11:44:29 PM

i am not so familiar with Java so i can't really say anything about the rest of your code but the way you are making nonce (d.getTime() Wink

is wrong. google it and you find solutions for generating nonce correctly.

The Poloniex API documentation says: 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.

So I think an increasing number should be correct.

Quote from: Herbert2020 on August 24, 2016, 11:44:29 PM

also your queryArgs needs nonce inside of it you generate it but never use it. add &nonce=### to your queryArgs

As I understood it, it should be just added as POST parameter as I did. But I will try to add it to the queryArgs as well.

Herbert2020

legendary

Activity: 1946

Merit: 1137

i am not so familiar with Java so i can't really say anything about the rest of your code but the way you are making nonce (d.getTime() Wink

is wrong. google it and you find solutions for generating nonce correctly.

also your queryArgs needs nonce inside of it you generate it but never use it. add &nonce=### to your queryArgs

flash10101

full member

Activity: 372

Merit: 130

I am trying to connect to the Poloniex API with Java, followed the Poloniex documentation and came up with the following code, but for some reason, I always get the error: Invalid command

Any idea what I am doing wrong?

Code:

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 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;
}

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