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