KTALa8JG

1public class BitmexClient {
2    private final OkHttpClient client = new OkHttpClient();
3
4    private String api = "";
5    private String secret = "";
6
7    public void setApi(String api, String secret) {
8        this.api = api;
9        this.secret=secret;
10    }
11
12    //API REQUEST BUILDING
13
14    private Response apicall(String verb, String endpoint, JSONObject jsonBody) 
15            throws NoSuchAlgorithmException, InvalidKeyException, IOException {
16        String expires = String.valueOf(Instant.now().getEpochSecond()+3600);
17        Request.Builder builder = new Request.Builder()
18                .url("https://www.bitmex.com/api/v1/"+endpoint)
19                .addHeader("user-agent", "bmcTest-v1.122323222")
20                .addHeader("content-type", "application/json; charset=utf-8")
21                .addHeader("accept", "application/json; charset=utf-8")
22                .addHeader("api-expires", expires)
23                .addHeader("api-key", api)
24                .addHeader("api-signature", encodeHexHmacSignature(secret, verb+"/api/v1/"+endpoint
25                        +expires+jsonBody.toString()));
26                /*if (verb.equals("POST")){
27                    builder.post(RequestBody.create(MediaType.get("text/plain"), jsonBody));
28                } else if (verb.equalsIgnoreCase("PUT")){
29                    builder.put(RequestBody.create(MediaType.get("text/plain"), jsonBody));
30                }*/
31                //builder.method("POST", RequestBody.create(MediaType.get("application/json; charset=utf-8"), jsonBody));
32                Request request = builder.build();
33                System.out.println(request.toString()+" - "+request.headers());
34        return client.newCall(request).execute();
35    }
36
37
38    private String encodeHexHmacSignature(String key, String data) 
39            throws NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeyException {
40        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
41        SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
42        sha256_HMAC.init(secret_key);
43        return Hex.encodeHexString(sha256_HMAC.doFinal(data.getBytes("UTF-8")));
44    }
45
46    //TRADING METHODS
47    public void placeOrder(){
48        String data = "{\"symbol\":\"XBTUSD\",\"orderQty\":20,\"ordType\":\"Market\"}";
49        try {
50            Response r = apicall("POST", "order", new JSONObject(data));
51            System.out.println(r.toString()+"\n"+r.headers().toString()+r.body().string());
52        } catch (NoSuchAlgorithmException | InvalidKeyException | IOException e) {
53            e.printStackTrace();
54        }
55    }
56}