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微信小程序登錄數(shù)據(jù)解密及狀態(tài)維持實(shí)例詳解

更新時(shí)間：2019年05月06日 11:12:31 作者：行走即歌

這篇文章主要介紹了微信小程序登錄數(shù)據(jù)解密及狀態(tài)維持,結(jié)合實(shí)例形式分析了微信小程序解密敏感信息及獲取session保持登陸狀態(tài)的相關(guān)操作技巧,需要的朋友可以參考下

本文實(shí)例講述了微信小程序登錄數(shù)據(jù)解密及狀態(tài)維持。分享給大家供大家參考，具體如下：

學(xué)習(xí)過(guò)小程序的朋友應(yīng)該知道，在小程序中是不支持cookie的，借助小程序中的緩存我們也可以存儲(chǔ)一些信息，但是對(duì)于一些比較重要的信息，我們需要通過(guò)登錄狀態(tài)維持來(lái)保存，同時(shí)，為了安全起見(jiàn)，用戶(hù)的敏感信息，也是需要加密在網(wǎng)絡(luò)上傳輸?shù)摹?/p>

前臺(tái)，service。封裝了http請(qǐng)求，同時(shí)封裝了getSession（通過(guò)code獲取服務(wù)器生成的session）、getUserInfo（獲取用戶(hù)信息）、getDecryptionData（解密數(shù)據(jù)）

//service.js
//封裝了http服務(wù),getUserInfo,提供回調(diào)函數(shù)
var recourse = {
 doMain: "http://www.domain.com/"
}
module.exports = {
 //Http Get
 requestGet: function (url, data, cb) {
  wx.request({
   url: recourse.doMain + url,
   data: data,
   method: 'GET',
   header: {},
   success: function (res) {
    cb(res, true)
   },
   fail: function () {
    cb(data, false)
   }
  })
 },
 //Http POST
 requestPost: function (url, data, cb) {
  wx.request({
   url: recourse.doMain + url,
   data: data,
   method: 'POST',
   header: {},
   success: function (res) {
    cb(res, true)
   },
   fail: function () {
    cb(data, false)
   }
  })
 },
 //獲取第三方sessionId
 getSession: function (code, cb) {
  wx.request({
   url: recourse.doMain + 'SmallRoutine/PostCode',
   data: { code: code },
   method: 'POST',
   success: function (res) {
    cb(res, true)
   },
   fail: function (res) {
    cb(res, false)
   }
  })
 },
 //獲取用戶(hù)信息
 getUserInfo: function (cb) {
  wx.getUserInfo({
   success: function (res) {
    cb(res, true)
   },
   fail: function (res) {
    cb(res, false)
   }
  })
 },
 //獲取解密數(shù)據(jù)
 getDecryptionData: function (cb) {
  wx.request({
   url: recourse.doMain+'SmallRoutine/Decryption',
   data: {
    encryptedData: wx.getStorageSync('encryptedData'),
    iv: wx.getStorageSync('iv'),
    session: wx.getStorageSync('thirdSessionId'),
   },
   method: 'POST',
   success: function (res) {
    cb(res, true)
   },
   fail: function (res) {
    cb(res, false)
   }
  })
 }
}

后臺(tái)，根據(jù)code獲取session，客戶(hù)端用來(lái)保持登錄狀態(tài)

[HttpPost]
public ActionResult PostCode(string code)
{
  try
  {
    if(!string.IsNullOrEmpty(code))
    {
      HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(string.Format("https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code",appId,appSecret,code));
      request.Method = "GET";
      HttpWebResponse response = (HttpWebResponse)request.GetResponse();
      StreamReader sr = new StreamReader(response.GetResponseStream());
      string content = sr.ReadToEnd();
      if(response.StatusCode == HttpStatusCode.OK)
      {
        var successModel = Newtonsoft.Json.JsonConvert.DeserializeObject<ValidateCodeSuccess>(content);
        if(null != successModel.session_key)
        {
          //session_key是微信服務(wù)器生成的針對(duì)用戶(hù)數(shù)據(jù)加密簽名的密鑰,不應(yīng)該傳輸?shù)娇蛻?hù)端
          var session_key = successModel.session_key;
          //3re_session用于服務(wù)器和小程序之間做登錄狀態(tài)校驗(yàn)
          var thirdSession = Guid.NewGuid().ToString().Replace("-","");
          var now = DateTime.Now;
          //存到數(shù)據(jù)庫(kù)或者redis緩存,這里一小時(shí)過(guò)期
          Service.AddLogin(new Domain.Login()
          {
            Code = code,
            Createime = now,
            OpenId = successModel.openid,
            OverdueTime = now.AddMinutes(60),
            SessionKey = successModel.session_key,
            SessionRd = thirdSession
          });
          return Json(new { success = true,session = thirdSession,openId = successModel.openid });
        }
        else
        {
          var errModel = Newtonsoft.Json.JsonConvert.DeserializeObject<ValidateCodeFail>(content);
          return Json(new { success = false,msg = errModel.errcode + ":" + errModel.errmsg });
        }
      }
      else
      {
        var errModel = Newtonsoft.Json.JsonConvert.DeserializeObject<ValidateCodeFail>(content);
        return Json(new { success = false,msg = errModel.errcode + ":" + errModel.errmsg });
      }
    }
    else
    {
      return Json(new { success = false,msg = "code不能為null" });
    }
  }
  catch(Exception e)
  {
    return Json(new { success = false });
  }
}

解密敏感信息

[HttpPost]
public ActionResult Decryption(string encryptedData,string iv,string session)
{
  try
  {
    var sessionKey = Service.GetSessionKey(session);
    if(!string.IsNullOrEmpty(sessionKey))
    {
      var str = AESDecrypt(encryptedData,sessionKey,iv);
      var data = Newtonsoft.Json.JsonConvert.DeserializeObject<EncryptedData>(str);
      if(null != data)
      {
        //服務(wù)器可以更新用戶(hù)信息
        return Json(new { success = true,data = data });
      }
    }
  }
  catch(Exception e)
  {
    Service.AddLog("翻譯錯(cuò)誤："+e.ToString());
  }
  return Json(new { success = false });
}

AES解密

public static string AESDecrypt(string encryptedData,string key,string iv)
{
  if(string.IsNullOrEmpty(encryptedData)) return "";
  byte[] encryptedData2 = Convert.FromBase64String(encryptedData);
  System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
  {
    Key = Convert.FromBase64String(key),
    IV = Convert.FromBase64String(iv),
    Mode = System.Security.Cryptography.CipherMode.CBC,
    Padding = System.Security.Cryptography.PaddingMode.PKCS7
  };
  System.Security.Cryptography.ICryptoTransform ctf = rm.CreateDecryptor();
  Byte[] resultArray = ctf.TransformFinalBlock(encryptedData2,0,encryptedData2.Length);
  return Encoding.UTF8.GetString(resultArray);
}

判斷用戶(hù)是否掉線(xiàn)

[HttpPost]
public ActionResult PostSession(string session)
{
  if(!string.IsNullOrEmpty(session))
  {
    var loginInfo = Service.GetLoginInfo(session);
    if(null != loginInfo)
    {
      return Json(new { success = true,openId = loginInfo.OpenId });
    }
    else
    {
      return Json(new { success = false });
    }
  }
  return Json(new { success = false });
}

前臺(tái)index.js

//index.js
var app = getApp()
Page({
 data: {
  userInfo: {},
 },
 onLoad: function () {
  var that = this
  app.getUserInfo(function (userInfo) {
   //更新數(shù)據(jù)
   that.setData({
    userInfo: userInfo
   })
  })
 }
})

前臺(tái)app.js

var service = require('./service/service.js')
var appConfig = {
  getUserInfo: function (cb) {
    var that = this
    if (that.globalData.userInfo) {
      //從緩存中用戶(hù)信息
    } else {
      //wx api 登錄
      wx.login({
        success: function (res) {
          console.log('登錄成功 code 為：' + res.code);
          if (res.code) {
            service.getSession(res.code, function (res, success) {
              if (success) {
                console.log('通過(guò) code 獲取第三方服務(wù)器 session 成功， session 為：' + res.data.session);
                //緩存起來(lái)
                wx.setStorageSync('thirdSessionId', res.data.session);
                //wx api 獲取用戶(hù)信息
                service.getUserInfo(function (res, success) {
                  if (success) {
                    console.log('獲取用戶(hù)信息成功， 加密數(shù)據(jù)為：' + res.encryptedData);
                    console.log('獲取用戶(hù)信息成功， 加密向量為：' + res.iv);
                    //緩存敏感的用戶(hù)信息,解密向量
                    wx.setStorageSync('encryptedData', res.encryptedData);
                    wx.setStorageSync('iv', res.iv);
                    that.globalData.userInfo = res.userInfo;
                    //解密數(shù)據(jù)
                    service.getDecryptionData(function (res, success) {
                      if (success) {
                        console.log("解密數(shù)據(jù)成功");
                        console.log(res.data.data);
                      } else {
                        console.log('解密數(shù)據(jù)失敗');
                      }
                    })
                  } else {
                    console.log('獲取用戶(hù)信息失敗')
                  }
                });
              } else {
                console.log('通過(guò) code 獲取第三方服務(wù)器 session 失敗');
              }
            });
          } else {
            console.log('登錄失敗:');
          }
        }
      })
    }
  },
  globalData: {
    userInfo: null
  }
}
App(appConfig)

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