本文实例讲述了微信小程序登录数据解密及状态维持。分享给大家供大家参考，具体如下：
学习过小程序的朋友应该知道，在小程序中是不支持cookie的，借助小程序中的缓存我们也可以存储一些信息，但是对于一些比较重要的信息，我们需要通过登录状态维持来保存，同时，为了安全起见，用户的敏感信息，也是需要加密在网络上传输的。
前台，service。封装了http请求，同时封装了getSession（通过code获取服务器生成的session）、getUserInfo（获取用户信息）、getDecryptionData（解密数据）
//service.js//封装了http服务,getUserInfo,提供回调函数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) } }) }, //获取第三方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) } }) }, //获取用户信息 getUserInfo: function (cb) { wx.getUserInfo({ success: function (res) { cb(res, true) }, fail: function (res) { cb(res, false) } }) }, //获取解密数据 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) } }) }} 后台，根据code获取session，客户端用来保持登录状态
[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是微信服务器生成的针对用户数据加密签名的密钥,不应该传输到客户端 var session_key = successModel.session_key; //3re_session用于服务器和小程序之间做登录状态校验 var thirdSession = Guid.NewGuid().ToString().Replace("-",""); var now = DateTime.Now; //存到数据库或者redis缓存,这里一小时过期 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不能为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) { //服务器可以更新用户信息 return Json(new { success = true,data = data }); } } } catch(Exception e) { Service.AddLog("翻译错误："+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);} 判断用户是否掉线
[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 });} 前台index.js
//index.jsvar app = getApp()Page({ data: { userInfo: {}, }, onLoad: function () { var that = this app.getUserInfo(function (userInfo) { //更新数据 that.setData({ userInfo: userInfo }) }) }}) 前台app.js
var service = require('./service/service.js')var appConfig = { getUserInfo: function (cb) { var that = this if (that.globalData.userInfo) { //从缓存中用户信息 } else { //wx api 登录 wx.login({ success: function (res) { console.log('登录成功 code 为：' + res.code); if (res.code) { service.getSession(res.code, function (res, success) { if (success) { console.log('通过 code 获取第三方服务器 session 成功， session 为：' + res.data.session); //缓存起来 wx.setStorageSync('thirdSessionId', res.data.session); //wx api 获取用户信息 service.getUserInfo(function (res, success) { if (success) { console.log('获取用户信息成功， 加密数据为：' + res.encryptedData); console.log('获取用户信息成功， 加密向量为：' + res.iv); //缓存敏感的用户信息,解密向量 wx.setStorageSync('encryptedData', res.encryptedData); wx.setStorageSync('iv', res.iv); that.globalData.userInfo = res.userInfo; //解密数据 service.getDecryptionData(function (res, success) { if (success) { console.log("解密数据成功"); console.log(res.data.data); } else { console.log('解密数据失败'); } }) } else { console.log('获取用户信息失败') } }); } else { console.log('通过 code 获取第三方服务器 session 失败'); } }); } else { console.log('登录失败:'); } } }) } }, globalData: { userInfo: null }}App(appConfig) 运行输出
希望本文所述对大家微信小程序开发有所帮助。
