# SDK开发库

**签名示例**

<a class="button secondary">复制</a>

```
/**
 * 生成sign
 **/
private String toSign(String timestamp, String method, String requestPath,
                             String queryString, String body, String secretKey) throws Exception {
    // 签名串
    String preHash = preHash(timestamp, method, requestPath, queryString, body);
    byte[] secretKeyBytes = secretKey.getBytes("UTF-8");
    SecretKeySpec secretKeySpec = new SecretKeySpec(secretKeyBytes, "HmacSHA256");
    Mac mac = (Mac) MAC.clone();
    mac.init(secretKeySpec);
    return Hex.encodeHexString(mac.doFinal(preHash.getBytes("UTF-8")));
}

/**
 * 签名串
 **/
private String preHash(String timestamp, String method, String requestPath, String queryString, String body) {
                                 
    StringBuilder preHash = new StringBuilder();
    preHash.append(timestamp);
    preHash.append(method.toUpperCase());
    preHash.append(requestPath);
    if (org.apache.commons.lang3.StringUtils.isNotEmpty(queryString)) {
        preHash.append("?").append(queryString);
    }
    if (org.apache.commons.lang3.StringUtils.isNotEmpty(body)) {
        preHash.append(body);
    }
    return preHash.toString();
}

/**
 * queryString
 **/
private String queryString(ServerHttpRequest request) {
    String url = request.getURI().toString();
    String queryString = "";
    if (url.contains("?")) {
        queryString = url.substring(url.lastIndexOf("?") + 1);
    }
    return queryString;
}
```

**下面是创建订单的样例**

* Java

<a class="button secondary">复制</a>

```
OkHttpClient client = new OkHttpClient().newBuilder()
.build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\"symbol\":\"BTCUSDT\",\"volume\":1,\"side\":\"BUY\",\"type\":\"LIMIT\",\"price\":10000,\"newClientOrderId\":\"\",\"recvWindow\":5000}");
Request request = new Request.Builder()
.url("https://openapi.xxx.com")
.method("POST", body)
.addHeader("X-CH-APIKEY", "Your API key")
.addHeader("X-CH-TS", "1596543296058")
.addHeader("Content-Type", "application/json")
.addHeader("X-CH-SIGN", "encrypt sign")
.build();
Response response = client.newCall(request).execute();
```

* Go

<a class="button secondary">复制</a>

```
package main
import (
"fmt"
"strings"
"net/http"
"io/ioutil"
)
func main() {
  url := "https://openapi.xxx.com"
  method := "POST"
  payload := strings.NewReader("{\"symbol\":\"BTCUSDT\",\"volume\":1,\"side\":\"BUY\",\"type\":\"LIMIT\",\"price\":10000,\"newClientOrderId\":\"\",\"recvWindow\":5000}")
  client := &http.Client {
}
  req, err := http.NewRequest(method, url, payload)
if err != nil {
    fmt.Println(err)
}
  req.Header.Add("X-CH-APIKEY", "Your API key")
  req.Header.Add("X-CH-TS", "1596543881257")
  req.Header.Add("Content-Type", "application/json")
  req.Header.Add("X-CH-SIGN", "encrypt sign")
  res, err := client.Do(req)
  defer res.Body.Close()
  body, err := ioutil.ReadAll(res.Body)
  fmt.Println(string(body))
}
```

* Python

<a class="button secondary">复制</a>

```
import requests
url = "https://openapi.xxx.com"
payload = "{\"symbol\":\"BTCUSDT\",\"volume\":1,\"side\":\"BUY\",\"type\":\"LIMIT\",\"price\":10000,\"newClientOrderId\":\"\",\"recvWindow\":5000}"
headers = {
'X-CH-APIKEY': 'Your API key',
'X-CH-TS': '1596543881257',
'Content-Type': 'application/json',
'X-CH-SIGN': 'encrypt sign'
}
response = requests.request("POST", url, headers=headers, data = payload)
print(response.text.encode('utf8'))
```

* Php

<a class="button secondary">复制</a>

```
<?php
require_once 'HTTP/Request2.php';
$request = new HTTP_Request2();
$request->setUrl('https://openapi.xxx.com');
$request->setMethod(HTTP_Request2::METHOD_POST);
$request->setConfig(array(
'follow_redirects' => TRUE
));
$request->setHeader(array(
'X-CH-APIKEY' => 'Your API key',
'X-CH-TS' => '1596543881257',
'Content-Type' => 'application/json',
'X-CH-SIGN' => 'encrypt sign'
));
$request->setBody('{"symbol":"BTCUSDT","volume":1,"side":"BUY","type":"LIMIT","price":10000,"newClientOrderId":"","recvWindow":5000}');
try {
  $response = $request->send();
if ($response->getStatus() == 200) {
    echo $response->getBody();
}
else {
    echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
    $response->getReasonPhrase();
}
}
catch(HTTP_Request2_Exception $e) {
  echo 'Error: ' . $e->getMessage();
}
```

* NodeJs

<a class="button secondary">复制</a>

```
var request = require('request');
var options = {
'method': 'POST',
'url': 'https://openapi.xxx.com',
'headers': {
'X-CH-APIKEY': 'Your API key',
'X-CH-TS': '1596543881257',
'Content-Type': 'application/json',
'X-CH-SIGN': 'encrypt sign'
},
  body: JSON.stringify({"symbol":"BTCUSDT","volume":1,"side":"BUY","type":"LIMIT","price":10000,"newClientOrderId":"","recvWindow":5000})
};
request(options, function (error, response) {
if (error) throw new Error(error);
  console.log(response.body);
});
```

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