微信小程序wx.request()方法封装并对参数进行MD5加密

1.创建request.js

/* 公共request 方法 */
import md5 from './md5.js';
const util = require('./util.js')
const app = getApp()
const requestApi = ({
  url,
  params,
  success,
  method = "post"
}) => {
  wx.showLoading({
    title: '加载中',
    mask: true
  });
  var header = {
    'content-type': 'application/x-www-form-urlencoded',
  }
  /**封装公共参数 fromDevice randomStr deviceId*/
  params.fromDevice = app.globalData.systemInfo.model;//获取设备的型号，自行修改
  params.randomStr= randomStr();
  params.deviceId = util.getDeviceId(16);

  var dataSignStr = '';
  var arr = Object.keys(params);
  /**参数key排序 */
  arr.sort();
  for (var i in arr) {
    if (arr[i] != 'dataSign') {
      dataSignStr += arr[i] + "=" + params[arr[i]] + '&';
    }
  }
  dataSignStr = dataSignStr.substring(0, dataSignStr.length - 1);
  /**md532位加密 */
  var dataSign = md5(dataSignStr).toUpperCase();
  /**新增dataSign属性 */
  params.dataSign = dataSign;//用此处加密字段和服务端加密的字段对比，判断是否篡改参数
  /**封装request */
  return new Promise(function (resolve, reject) {
      wx.request({
        url: app.globalData.host + url,
        method: method,
        data: params,
        header: header,
        success: (res) => {
          wx.hideLoading();
          if (res.data.result === 'error' || res['statusCode'] !== 200) {
            wx.showToast({
              title: res.data.msg || '请求出错',
              icon: 'none',
              duration: 2000,
              mask: true
            })
          }
          resolve(res.data)
        },
        fail: function (res) {
          wx.hideLoading();
          wx.showToast({
            title: res.errMsg || '',
            icon: 'none',
            duration: 2000,
            mask: true
          })
          reject(res)
        },
        complete: function () {
          wx.hideLoading()
        }
      })
    })
    .catch((res) => {})
}
/**
 * 随机64位数字
 */
const randomStr = () => {
  var randomStr = "";
  for (var i = 0; i < 64; i++) {
    randomStr += Math.random().toString(36).substr(2, 1);
  }
  return randomStr.toUpperCase();
}
/*暴露公共方法 */
module.exports = {
  requestApi: requestApi,
  randomStr: randomStr
}

2.创建md5.js

/*  
 * 小程序MD5加密算法封装
 * +-----------------------------------------------------
 * Author: zzb
 * Created: 2020-06-05
 * +-----------------------------------------------------
 * Usage: 
 * 
 *    引入(比如index.js页面引入md5.js):
 *       //pages/index.js
 *       import md5 from 'utils/md5.js';
 * 
 *    调用base64MD5加密:
 *       var encryptedStr = md5('需要加密的字符串');
 */

function safe_add(x, y) {
  var lsw = (x & 0xFFFF) + (y & 0xFFFF),
    msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xFFFF);
}

/*
* Bitwise rotate a 32-bit number to the left.
*/
function bit_rol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt));
}

/*
* These functions implement the four basic operations the algorithm uses.
*/
function md5_cmn(q, a, b, x, s, t) {
  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
}
function md5_ff(a, b, c, d, x, s, t) {
  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t) {
  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t) {
  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t) {
  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
* Calculate the MD5 of an array of little-endian words, and a bit length.
*/
function binl_md5(x, len) {
  /* append padding */
  x[len >> 5] |= 0x80 << (len % 32);
  x[(((len + 64) >>> 9) << 4) + 14] = len;

  var i, olda, oldb, oldc, oldd,
    a = 1732584193,
    b = -271733879,
    c = -1732584194,
    d = 271733878;

  for (i = 0; i < x.length; i += 16) {
    olda = a;
    oldb = b;
    oldc = c;
    oldd = d;

    a = md5_ff(a, b, c, d, x[i], 7, -680876936);
    d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
    c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
    b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
    a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
    d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
    c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
    b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
    a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
    d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
    c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
    b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
    a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
    d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
    c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
    b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);

    a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
    d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
    c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
    b = md5_gg(b, c, d, a, x[i], 20, -373897302);
    a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
    d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
    c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
    b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
    a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
    d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
    c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
    b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
    a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
    d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
    c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
    b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);

    a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
    d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
    c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
    b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
    a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
    d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
    c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
    b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
    a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
    d = md5_hh(d, a, b, c, x[i], 11, -358537222);
    c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
    b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
    a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
    d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
    c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
    b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);

    a = md5_ii(a, b, c, d, x[i], 6, -198630844);
    d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
    c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
    b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
    a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
    d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
    c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
    b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
    a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
    d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
    c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
    b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
    a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
    d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
    c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
    b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);

    a = safe_add(a, olda);
    b = safe_add(b, oldb);
    c = safe_add(c, oldc);
    d = safe_add(d, oldd);
  }
  return [a, b, c, d];
}

/*
* Convert an array of little-endian words to a string
*/
function binl2rstr(input) {
  var i,
    output = '';
  for (i = 0; i < input.length * 32; i += 8) {
    output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF);
  }
  return output;
}

/*
* Convert a raw string to an array of little-endian words
* Characters >255 have their high-byte silently ignored.
*/
function rstr2binl(input) {
  var i,
    output = [];
  output[(input.length >> 2) - 1] = undefined;
  for (i = 0; i < output.length; i += 1) {
    output[i] = 0;
  }
  for (i = 0; i < input.length * 8; i += 8) {
    output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32);
  }
  return output;
}

/*
* Calculate the MD5 of a raw string
*/
function rstr_md5(s) {
  return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
}

/*
* Calculate the HMAC-MD5, of a key and some data (raw strings)
*/
function rstr_hmac_md5(key, data) {
  var i,
    bkey = rstr2binl(key),
    ipad = [],
    opad = [],
    hash;
  ipad[15] = opad[15] = undefined;
  if (bkey.length > 16) {
    bkey = binl_md5(bkey, key.length * 8);
  }
  for (i = 0; i < 16; i += 1) {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }
  hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
  return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
}

/*
* Convert a raw string to a hex string
*/
function rstr2hex(input) {
  var hex_tab = '0123456789abcdef',
    output = '',
    x,
    i;
  for (i = 0; i < input.length; i += 1) {
    x = input.charCodeAt(i);
    output += hex_tab.charAt((x >>> 4) & 0x0F) +
      hex_tab.charAt(x & 0x0F);
  }
  return output;
}

/*
* Encode a string as utf-8
*/
function str2rstr_utf8(input) {
  return unescape(encodeURIComponent(input));
}

/*
* Take string arguments and return either raw or hex encoded strings
*/
function raw_md5(s) {
  return rstr_md5(str2rstr_utf8(s));
}
function hex_md5(s) {
  return rstr2hex(raw_md5(s));
}
function raw_hmac_md5(k, d) {
  return rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d));
}
function hex_hmac_md5(k, d) {
  return rstr2hex(raw_hmac_md5(k, d));
}

/** 
 * 暴露接口给小程序 因为export default，所以引入的时候可以自定义方法名称 
 * +--------------------
 * @param {String}   string  需要加密的字符串
 * @param {String}   key     加密key
 * @param {Boolean}  raw     规则 false: 返回hex_md5, true: 返回raw_md5
 */
export default function md5(string, key, raw) {
  if (!key) {
    if (!raw) {
      return hex_md5(string);
    }
    return raw_md5(string);
  }
  if (!raw) {
    return hex_hmac_md5(key, string);
  }
  return raw_hmac_md5(key, string);
}

3.创建util.js

const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : '0' + n
}

/**
 * 生成唯一不重复ID
 */
function genID(length) {
  return Number(Math.random().toString().substr(3, length) + Date.now()).toString(36);
}

/**
 * 模拟生成deviceId
 */
function getDeviceId(length) {
  var str = Math.random().toString(36).substr(2);
    if (str.length>=length) {
        return str.substr(0, length);
    }
    str += getDeviceId(length-str.length);
    return str;
}
module.exports = {
  formatTime: formatTime,
  genID: genID,
  getDeviceId: getDeviceId
}

4.调用示例

const request = require('../../../utils/request.js')//页面引用

request.requestApi({
      url: "/接口地址",//域名已经在请求方法中拼接
      params: {
        mobileNum: page.data.phone_num,
        mobileCode: page.data.phone_code
      },
      method: "post",
    }).then(res => {
        console.log(res)
    })

参数加密规则：

1.对传递到后台的参数key进行排序

2.对已经排序的参数以 key=value&key=value 进行拼接

3.对拼接的参数进行MD5加密并转换为大写

4.后台对接收的参数做同上操作，校验参数，防止被篡改