@jashine/unipay-poslink/utils/utl.js

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"use strict";
/**
 * Created by luckyriko on 2022/1/14.
 */

const sha256 = require('crypto-js/sha256');
const hmacSHA256 = require('crypto-js/hmac-sha256');
const Base64 = require('crypto-js/enc-base64');
const dayjs = require('dayjs')
const { v4: uuidv4 } = require('uuid');

const utl = module.exports = {};
/**
 * 浅拷贝
 * @param obj
 * @returns {{}}
 */
utl.copy = function(obj) {
  var ret = {};
  for (var k in obj) {
    ret[k] = obj[k];
  }
  return ret;
};
/**
 * 对请求参数进行组装、编码
 * @param {Object} params  请求参数
 * @returns {Object}
 */
utl.encodeParams = function(params) {
  const keys = [];
  for (const k in params) {
    const v = params[k];
    if (v !== undefined && v !== "") keys.push(k);
  }
  keys.sort();

  let unencodeStr = "";
  let encodeStr = "";
  const len = keys.length;
  for (let i = 0; i < len; ++i) {
    const k = keys[i];
    if (i !== 0) {
      unencodeStr += "&";
      encodeStr += "&";
    }
    unencodeStr += k + "=" + (typeof params[k] == "object" ? JSON.stringify(params[k]) : params[k]);
    encodeStr += k + "=" + encodeURIComponent(params[k]);
  }
  return { unencode: unencodeStr, encode: encodeStr };
};

/**
 * 对字符串进行签名验证
 * @param {String} str  要验证的参数的字符串
 * @param {String} sign 要验证的签名
 * @param {String} key  商户应用key
 * @param {String} [signType] 签名类型
 * @returns {Boolean}
 */
utl.signVerify = function(str, sign, key, signType) {
  const _sign = utl.sign(str, key, signType);
  return _sign == sign.toLowerCase();
};

/**
 * 对字符串进行签名
 * @param {String} appid 要签名的字符串
 * @param {String} appkey 商户应用key
 * @param {String} params 请求参数
 * @returns {String}
 */
utl.sign = function(appid, appkey, params) {
  let nonce = uuidv4().replace(new RegExp('-','gm'), "");
  let timestamp = dayjs().format("YYYYMMDDHHmmss");

  let A = JSON.stringify(params);
  let B = sha256(A).toString();
  let C = appid+timestamp+nonce+B;
  let D = appkey;
  let E = hmacSHA256(C, D)
  let F = Base64.stringify(E);

  let authorization= `OPEN-BODY-SIG AppId="${appid}",Timestamp="${timestamp}",Nonce="${nonce}",Signature="${F}"`
  return authorization

};