用Java实现Kraken API
所以我目前正致力于Kraken API for Java 。 我正在使用我在http://pastebin.com/nHJDAbH8上找到的示例代码。
Kraken （ https://www.kraken.com/help/api ）描述的一般用法是：
API-Key= API密钥
API-Sign=使用HMAC-SHA512的消息签名
( URI path + SHA256( nonce + POST data ) )和base64解码的秘密API密钥
和
nonce=总是增加无符号的64位整数
otp=双因素密码（如果启用了双因素，否则不需要）
但是我面临以下回应：
{"error":["EAPI:Invalid key"]}
我已经尝试了几种方法（获得一个新的API，尝试更改sha256方法，因为我认为它被散列的方式有问题）
所以这是代码：
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.URL; import java.security.InvalidKeyException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; import org.apache.commons.codec.binary.Base64; public class KrakenClient { protected static String key = "myAPIKey"; // API key protected static String secret = "MySecret===="; // API secret protected static String url = "api.kraken.com"; // API base URL protected static String version = "0"; // API version public static void main(String[] args) throws Exception { queryPrivateMethod("Balance"); } public static void queryPrivateMethod(String method) throws NoSuchAlgorithmException, IOException{ long nonce = System.currentTimeMillis(); String path = "/" + version + "/private/" + method; // The path like "/0/private/Balance" String urlComp = "https://"+url+path; // The complete url like "https://api.kraken.com/0/private/Balance" String postdata = "nonce="+nonce; String sign = createSignature(nonce, path, postdata); postConnection(urlComp, sign, postdata); } /** * @param nonce * @param path * @param postdata * @return * @throws NoSuchAlgorithmException * @throws IOException */ private static String createSignature(long nonce, String path, String postdata) throws NoSuchAlgorithmException, IOException { return hmac(path+sha256(nonce + postdata), new String(Base64.decodeBase64(secret))); } public static String sha256Hex(String text) throws NoSuchAlgorithmException, IOException{ return org.apache.commons.codec.digest.DigestUtils.sha256Hex(text); } public static byte[] sha256(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException{ MessageDigest md = MessageDigest.getInstance("SHA-256"); md.update(text.getBytes()); byte[] digest = md.digest(); return digest; } public static void postConnection(String url1, String sign, String postData) throws IOException{ URL url = new URL( url1 ); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.addRequestProperty("API-Key", key); connection.addRequestProperty("API-Sign", Base64.encodeBase64String(sign.getBytes())); // connection.addRequestProperty("API-Sign", sign); connection.addRequestProperty("User-Agent", "Mozilla/4.0"); connection.setRequestMethod( "POST" ); connection.setDoInput( true ); connection.setDoOutput( true ); connection.setUseCaches( false ); // connection.setRequestProperty( "Content-Type", // "application/x-www-form-urlencoded" ); connection.setRequestProperty( "Content-Length", String.valueOf(postData.length()) ); OutputStreamWriter writer = new OutputStreamWriter( connection.getOutputStream() ); writer.write( postData ); writer.flush(); BufferedReader reader = new BufferedReader( new InputStreamReader(connection.getInputStream()) ); for ( String line; (line = reader.readLine()) != null; ) { System.out.println( line ); } writer.close(); reader.close(); } public static String hmac(String text, String secret){ Mac mac =null; SecretKeySpec key = null; // Create a new secret key try { key = new SecretKeySpec( secret.getBytes( "UTF-8"), "HmacSHA512" ); } catch( UnsupportedEncodingException uee) { System.err.println( "Unsupported encoding exception: " + uee.toString()); return null; } // Create a new mac try { mac = Mac.getInstance( "HmacSHA512" ); } catch( NoSuchAlgorithmException nsae) { System.err.println( "No such algorithm exception: " + nsae.toString()); return null; } // Init mac with key. try { mac.init( key); } catch( InvalidKeyException ike) { System.err.println( "Invalid key exception: " + ike.toString()); return null; } // Encode the text with the secret try { return new String( mac.doFinal(text.getBytes( "UTF-8"))); } catch( UnsupportedEncodingException uee) { System.err.println( "Unsupported encoding exception: " + uee.toString()); return null; } } }
这是一个工作示例：
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; }