const querystring = require('querystring');
const uuid = require('uuid');

const appkey = '';
const secretkey = '';
const timestamp = Math.floor(Date.now() / 1000);
const params = {
  appkey: appkey,
  timestamp: timestamp,
  nonce: timestamp,
};

// 步骤4：按照参数名进行字典序排序
const sortedParams = Object.keys(params).sort().reduce((result, key) => {
  result[key] = params[key];
  return result;
}, {});

// 步骤5：拼接参数字符串
const queryString = querystring.stringify(sortedParams);

// 步骤6：HMAC-SHA256加密
var hash = CryptoJS.HmacSHA256(queryString, secretkey);
var hmac = CryptoJS.enc.Base64.stringify(hash);

// 步骤7：MD5加密并截取
let signatureStr = CryptoJS.MD5(hmac).toString();
console.log(signatureStr)
let signature = signatureStr.substr(5, 10);
console.log(queryString,signature)
// 步骤8：将signature加入参数中
const finalParams = Object.assign({}, sortedParams, { signature: signature });

// 构造请求参数
const finalQueryString = querystring.stringify(finalParams);

console.log(finalQueryString);