V3.ts

import axios from "axios";
import {format} from "date-fns";

const CryptoJS = require('crypto-js')

let fp: string = '', tk: string = '', genKey: any = null

async function requestAlgo(appId: string, USER_AGENT: string = 'jdpingou;') {
  function generateFp() {
    let e = "0123456789";
    let a = 13;
    let i = '';
    for (; a--;)
      i += e[Math.random() * e.length | 0];
    return (i + Date.now()).slice(0, 16)
  }

  fp = generateFp()
  let {data} = await axios.post(`https://cactus.jd.com/request_algo?g_ty=ajax`, `{"version":"3.0","fp":"${fp}","appId":"${appId}","timestamp":${Date.now()},"platform":"web","expandParams":""}`, {
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json',
      "Accept-Encoding": "gzip, deflate, br",
      "Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
      'host': 'cactus.jd.com',
      'Referer': 'https://cactus.jd.com',
      'User-Agent': USER_AGENT
    }
  })
  tk = data.data.result.tk;
  genKey = new Function(`return ${data.data.result.algo}`)();
  return {fp, tk, genKey}
}

function geth5st(t: { key: string, value: string } [], appId: string) {
  let a = ''
  t.forEach(({key, value}) => {
    a += `${key}:${value}&`
  })
  a = a.slice(0, -1)
  let time = Date.now()
  let timestamp = format(time, "yyyyMMddHHmmssSSS");
  let hash1 = genKey(tk, fp.toString(), timestamp.toString(), appId.toString(), CryptoJS).toString(CryptoJS.enc.Hex);
  const hash2 = CryptoJS.HmacSHA256(a, hash1).toString();
  return encodeURIComponent(["".concat(timestamp.toString()), "".concat(fp.toString()), "".concat(appId.toString()), "".concat(tk), "".concat(hash2), "3.0", "".concat(time.toString())].join(";"))
}

export {
  requestAlgo,
  geth5st,
}