小程序接口封装签名

第一步：创建requestData.js 文件

var md5 = require('./md5.js');

//-----------封装签名请求--------

function requestSignFn(data) {

  

  var signString = 'vc14ww7acrp59jzkA'; 

  for(var i in data){

    signString = signString + i;

  }

  let key = '';

  

  let sdata = md5.md5(key + signString)

  

  return sdata

}

module.exports = {

  requestSign : requestSignFn ,  

}


在第一步引入：md5.js

var rotateLeft = function(lValue, iShiftBits) {  
    return(lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));  
}  
    
var addUnsigned = function(lX, lY) {  
    var lX4, lY4, lX8, lY8, lResult;  
    lX8 = (lX & 0x80000000);  
    lY8 = (lY & 0x80000000);  
    lX4 = (lX & 0x40000000);  
    lY4 = (lY & 0x40000000);  
    lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);  
    if(lX4 & lY4) return(lResult ^ 0x80000000 ^ lX8 ^ lY8);  
    if(lX4 | lY4) {  
        if(lResult & 0x40000000) return(lResult ^ 0xC0000000 ^ lX8 ^ lY8);  
        else return(lResult ^ 0x40000000 ^ lX8 ^ lY8);  
    } else {  
        return(lResult ^ lX8 ^ lY8);  
    }  
}  
    
var F = function(x, y, z) {  
    return(x & y) | ((~x) & z);  
}  
    
var G = function(x, y, z) {  
    return(x & z) | (y & (~z));  
}  
    
var H = function(x, y, z) {  
    return(x ^ y ^ z);  
}  
    
var I = function(x, y, z) {  
    return(y ^ (x | (~z)));  
}  
    
var FF = function(a, b, c, d, x, s, ac) {  
    a = addUnsigned(a, addUnsigned(addUnsigned(F(b, c, d), x), ac));  
    return addUnsigned(rotateLeft(a, s), b);  
};  
    
var GG = function(a, b, c, d, x, s, ac) {  
    a = addUnsigned(a, addUnsigned(addUnsigned(G(b, c, d), x), ac));  
    return addUnsigned(rotateLeft(a, s), b);  
};  
    
var HH = function(a, b, c, d, x, s, ac) {  
    a = addUnsigned(a, addUnsigned(addUnsigned(H(b, c, d), x), ac));  
    return addUnsigned(rotateLeft(a, s), b);  
};  
    
var II = function(a, b, c, d, x, s, ac) {  
    a = addUnsigned(a, addUnsigned(addUnsigned(I(b, c, d), x), ac));  
    return addUnsigned(rotateLeft(a, s), b);  
};  
    
var convertToWordArray = function(string) {  
    var lWordCount;  
    var lMessageLength = string.length;  
    var lNumberOfWordsTempOne = lMessageLength + 8;  
    var lNumberOfWordsTempTwo = (lNumberOfWordsTempOne - (lNumberOfWordsTempOne % 64)) / 64;  
    var lNumberOfWords = (lNumberOfWordsTempTwo + 1) * 16;  
    var lWordArray = Array(lNumberOfWords - 1);  
    var lBytePosition = 0;  
    var lByteCount = 0;  
    while(lByteCount < lMessageLength) {  
        lWordCount = (lByteCount - (lByteCount % 4)) / 4;  
        lBytePosition = (lByteCount % 4) * 8;  
        lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition));  
        lByteCount++;  
    }  
    lWordCount = (lByteCount - (lByteCount % 4)) / 4;  
    lBytePosition = (lByteCount % 4) * 8;  
    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);  
    lWordArray[lNumberOfWords - 2] = lMessageLength << 3;  
    lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;  
    return lWordArray;  
};  
    
var wordToHex = function(lValue) {  
    var WordToHexValue = "",  
        WordToHexValueTemp = "",  
        lByte, lCount;  
    for(lCount = 0; lCount <= 3; lCount++) {  
        lByte = (lValue >>> (lCount * 8)) & 255;  
        WordToHexValueTemp = "0" + lByte.toString(16);  
        WordToHexValue = WordToHexValue + WordToHexValueTemp.substr(WordToHexValueTemp.length - 2, 2);  
    }  
    return WordToHexValue;  
};  
    
var uTF8Encode = function(string) {  
    string = string.replace(/\x0d\x0a/g, "\x0a");  
    var output = "";  
    for(var n = 0; n < string.length; n++) {  
        var c = string.charCodeAt(n);  
        if(c < 128) {  
            output += String.fromCharCode(c);  
        } else if((c > 127) && (c < 2048)) {  
            output += String.fromCharCode((c >> 6) | 192);  
            output += String.fromCharCode((c & 63) | 128);  
        } else {  
            output += String.fromCharCode((c >> 12) | 224);  
            output += String.fromCharCode(((c >> 6) & 63) | 128);  
            output += String.fromCharCode((c & 63) | 128);  
        }  
    }  
    return output;  
};  
    
function md5(string) {  
    var x = Array();  
    var k, AA, BB, CC, DD, a, b, c, d;  
    var S11 = 7,  
        S12 = 12,  
        S13 = 17,  
        S14 = 22;  
    var S21 = 5,  
        S22 = 9,  
        S23 = 14,  
        S24 = 20;  
    var S31 = 4,  
        S32 = 11,  
        S33 = 16,  
        S34 = 23;  
    var S41 = 6,  
        S42 = 10,  
        S43 = 15,  
        S44 = 21;  
    string = uTF8Encode(string);  
    x = convertToWordArray(string);  
    a = 0x67452301;  
    b = 0xEFCDAB89;  
    c = 0x98BADCFE;  
    d = 0x10325476;  
    for(k = 0; k < x.length; k += 16) {  
        AA = a;  
        BB = b;  
        CC = c;  
        DD = d;  
        a = FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);  
        d = FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);  
        c = FF(c, d, a, b, x[k + 2], S13, 0x242070DB);  
        b = FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);  
        a = FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);  
        d = FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);  
        c = FF(c, d, a, b, x[k + 6], S13, 0xA8304613);  
        b = FF(b, c, d, a, x[k + 7], S14, 0xFD469501);  
        a = FF(a, b, c, d, x[k + 8], S11, 0x698098D8);  
        d = FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);  
        c = FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);  
        b = FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);  
        a = FF(a, b, c, d, x[k + 12], S11, 0x6B901122);  
        d = FF(d, a, b, c, x[k + 13], S12, 0xFD987193);  
        c = FF(c, d, a, b, x[k + 14], S13, 0xA679438E);  
        b = FF(b, c, d, a, x[k + 15], S14, 0x49B40821);  
        a = GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);  
        d = GG(d, a, b, c, x[k + 6], S22, 0xC040B340);  
        c = GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);  
        b = GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);  
        a = GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);  
        d = GG(d, a, b, c, x[k + 10], S22, 0x2441453);  
        c = GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);  
        b = GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);  
        a = GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);  
        d = GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);  
        c = GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);  
        b = GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);  
        a = GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);  
        d = GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);  
        c = GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);  
        b = GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);  
        a = HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);  
        d = HH(d, a, b, c, x[k + 8], S32, 0x8771F681);  
        c = HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);  
        b = HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);  
        a = HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);  
        d = HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);  
        c = HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);  
        b = HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);  
        a = HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);  
        d = HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);  
        c = HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);  
        b = HH(b, c, d, a, x[k + 6], S34, 0x4881D05);  
        a = HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);  
        d = HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);  
        c = HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);  
        b = HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);  
        a = II(a, b, c, d, x[k + 0], S41, 0xF4292244);  
        d = II(d, a, b, c, x[k + 7], S42, 0x432AFF97);  
        c = II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);  
        b = II(b, c, d, a, x[k + 5], S44, 0xFC93A039);  
        a = II(a, b, c, d, x[k + 12], S41, 0x655B59C3);  
        d = II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);  
        c = II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);  
        b = II(b, c, d, a, x[k + 1], S44, 0x85845DD1);  
        a = II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);  
        d = II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);  
        c = II(c, d, a, b, x[k + 6], S43, 0xA3014314);  
        b = II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);  
        a = II(a, b, c, d, x[k + 4], S41, 0xF7537E82);  
        d = II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);  
        c = II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);  
        b = II(b, c, d, a, x[k + 9], S44, 0xEB86D391);  
        a = addUnsigned(a, AA);  
        b = addUnsigned(b, BB);  
        c = addUnsigned(c, CC);  
        d = addUnsigned(d, DD);  
    }  
    var tempValue = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d);  
    return tempValue.toLowerCase();  
}  
    
module.exports.md5 = md5

　　
请求示例：

var requestSign = require('../../../utils/requestData.js');   //  引入签名

var api = require('../../../utils/api.js').open_api;   //   引入接口

var re = require('../../../utils/request.js');  //  引入请求promise

var util = require('../../../utils/util.js');  // 引入util公共方法

  

//请求示例：
  getLimitMpCode: function () {
    const that = this;
    const extConfig = wx.getExtConfigSync ? wx.getExtConfigSync() : {}
    var postData = {                // 参数
      'website_id': extConfig.website_id,
      'auth_id': extConfig.auth_id,
      'page': 'pages/goods/detail/index',
      "goodsId": that.data.goodsId
    };
    if (wx.getStorageSync('extend_code')) {
      postData.code = wx.getStorageSync('extend_code')
    }
    let datainfo = requestSign.requestSign(postData);
    header.sign = datainfo;
    re.request(api.get_getUnLimitMpCode, postData, header).then((res) => {
      if (res.data.code == 1) {
        let code_img = res.data.data;
        that.setData({
          code_img: code_img
        })
        //that.base64CodeImg(code_img)
      } else {
        that.setData({
          code_img: '/images/no-goods.png'
        })
      }
    })
  },

　　引入var re = require('../../../utils/request.js');  //  引入请求promise

 

// 请求方法
/**
 * url 请求地址
 * data 请求数据
 * header 带有签名信息的请求头
 */
export function request(url,data,header){
  return new Promise((resolve,reject) => {
    wx.request({
      url: url,
      data: data,
      header: header,
      method: 'POST',
      dataType: 'json',
      responseType: 'text',
      success: (res) => {
        resolve(res);               
      },
      fail: (res) => { },
    })
  })