How the WeChat applet server obtains user decrypted information

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C# WeChat applet server to obtain user decrypted information Example code

Implementation code:

using AIOWeb.Models; 
using Newtonsoft.Json; 
using Newtonsoft.Json.Linq; 
using System; 
using System.Collections.Generic; 
using System.Data; 
using System.Data.SqlClient; 
using System.Linq; 
using System.Web; 
 
namespace AIOWeb 
{ 
  /// <summary> 
  /// wxapi 的摘要说明 
  /// </summary> 
  public class wxapi : IHttpHandler 
  { 
    public void ProcessRequest(HttpContext context) 
    { 
      context.Response.ContentType = "text/plain"; 
 
      string code = ""; 
      string iv = ""; 
      string encryptedData = ""; 
      try 
      { 
        code = HttpContext.Current.Request.QueryString["code"].ToString(); 
        iv = HttpContext.Current.Request.QueryString["iv"].ToString(); 
        encryptedData = HttpContext.Current.Request.QueryString["encryptedData"].ToString(); 
      } 
      catch (Exception ex) 
      { 
        context.Response.Write(ex.ToString()); 
      } 
 
      string Appid = "wxdb2641f85b04f1b3"; 
      string Secret = "8591d8cd7197b9197e17b3275329a1e7"; 
      string grant_type = "authorization_code"; 
 
      //向微信服务端 使用登录凭证 code 获取 session_key 和 openid  
      string url = "https://api.weixin.qq.com/sns/jscode2session?appid=" + Appid + "&secret=" + Secret + "&js_code=" + code + "&grant_type=" + grant_type; 
      string type = "utf-8"; 
 
      AIOWeb.Models.GetUsersHelper GetUsersHelper = new AIOWeb.Models.GetUsersHelper(); 
      string j = GetUsersHelper.GetUrltoHtml(url, type);//获取微信服务器返回字符串 
 
      //将字符串转换为json格式 
      JObject jo = (JObject)JsonConvert.DeserializeObject(j); 
 
      result res = new result(); 
      try 
      { 
        //微信服务器验证成功 
        res.openid = jo["openid"].ToString(); 
        res.session_key = jo["session_key"].ToString(); 
      } 
      catch (Exception) 
      { 
        //微信服务器验证失败 
        res.errcode = jo["errcode"].ToString(); 
        res.errmsg = jo["errmsg"].ToString(); 
      } 
      if (!string.IsNullOrEmpty(res.openid)) 
      { 
        //用户数据解密 
        GetUsersHelper.AesIV = iv; 
        GetUsersHelper.AesKey = res.session_key; 
 
        string result = GetUsersHelper.AESDecrypt(encryptedData); 
 
 
        //存储用户数据 
        JObject _usrInfo = (JObject)JsonConvert.DeserializeObject(result); 
 
        userInfo userInfo = new userInfo(); 
        userInfo.openId = _usrInfo["openId"].ToString(); 
 
        try //部分验证返回值中没有unionId 
        { 
          userInfo.unionId = _usrInfo["unionId"].ToString(); 
        } 
        catch (Exception) 
        { 
          userInfo.unionId = "unionId"; 
        } 
         
        userInfo.nickName = _usrInfo["nickName"].ToString(); 
        userInfo.gender = _usrInfo["gender"].ToString(); 
        userInfo.city = _usrInfo["city"].ToString(); 
        userInfo.province = _usrInfo["province"].ToString(); 
        userInfo.country = _usrInfo["country"].ToString(); 
        userInfo.avatarUrl = _usrInfo["avatarUrl"].ToString(); 
 
        object watermark = _usrInfo["watermark"].ToString(); 
        object appid = _usrInfo["watermark"]["appid"].ToString(); 
        object timestamp = _usrInfo["watermark"]["timestamp"].ToString(); 
 
 
        #region 
 
 
        //创建连接池对象（与数据库服务器进行连接） 
        SqlConnection conn = new SqlConnection("server=127.0.0.1;database=Test;uid=sa;pwd=1"); 
        //打开连接池 
        conn.Open(); 
        //创建命令对象 
        string Qrystr = "SELECT * FROM WeChatUsers WHERE openId=&#39;" + userInfo.openId + "&#39;"; 
        SqlCommand cmdQry = new SqlCommand(Qrystr, conn); 
        object obj = cmdQry.ExecuteScalar(); 
        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) 
        { 
          string str = "INSERT INTO WeChatUsers ([UnionId] ,[OpenId],[NickName],[Gender],[City],[Province],[Country],[AvatarUrl],[Appid],[Timestamp],[Memo],[counts])VALUES(&#39;" + userInfo.unionId + "&#39;,&#39;" + userInfo.openId + "&#39;,&#39;" + userInfo.nickName + "&#39;,&#39;" + userInfo.gender + "&#39;,&#39;" + userInfo.city + "&#39;,&#39;" + userInfo.province + "&#39;,&#39;" + userInfo.country + "&#39;,&#39;" + userInfo.avatarUrl + "&#39;,&#39;" + appid.ToString() + "&#39;,&#39;" + timestamp.ToString() + "&#39;,&#39;来自微信小程序&#39;,&#39;1&#39;)"; 
 
          SqlCommand cmdUp = new SqlCommand(str, conn); 
          // 执行操作 
          try 
          { 
            int row = cmdUp.ExecuteNonQuery(); 
          } 
          catch (Exception ex) 
          { 
            context.Response.Write(ex.ToString()); 
          } 
        } 
        else 
        { 
          //多次访问，记录访问次数counts  更新unionId是预防最初没有，后期关联后却仍未记录 
          string str = "UPDATE dbo.WeChatUsers SET counts = counts+1，UnionId = &#39;" + userInfo.unionId + "&#39; WHERE OpenId=&#39;" + userInfo.openId + "&#39;"; 
          SqlCommand cmdUp = new SqlCommand(str, conn); 
          int row = cmdUp.ExecuteNonQuery(); 
        } 
         
        //关闭连接池 
        conn.Close(); 
        #endregion 
 
        //返回解密后的用户数据 
        context.Response.Write(result); 
      } 
      else 
      { 
        context.Response.Write(j); 
      } 
    } 
 
    public bool IsReusable 
    { 
      get 
      { 
        return false; 
      } 
    } 
  } 
}

GetUsersHelper helper class

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using System.Security.Cryptography; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace AIOWeb.Models 
{ 
  public class GetUsersHelper 
  { 
 
    /// <summary> 
    /// 获取链接返回数据 
    /// </summary> 
    /// <param name="Url">链接</param> 
    /// <param name="type">请求类型</param> 
    /// <returns></returns> 
    public string GetUrltoHtml(string Url, string type) 
    { 
      try 
      { 
        System.Net.WebRequest wReq = System.Net.WebRequest.Create(Url); 
        // Get the response instance. 
        System.Net.WebResponse wResp = wReq.GetResponse(); 
        System.IO.Stream respStream = wResp.GetResponseStream(); 
        // Dim reader As StreamReader = New StreamReader(respStream) 
        using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream, Encoding.GetEncoding(type))) 
        { 
          return reader.ReadToEnd(); 
        } 
      } 
      catch (System.Exception ex) 
      { 
        return ex.Message; 
      } 
    } 
    #region 微信小程序用户数据解密 
 
    public static string AesKey; 
    public static string AesIV; 
 
    /// <summary> 
    /// AES解密 
    /// </summary> 
    /// <param name="inputdata">输入的数据encryptedData</param> 
    /// <param name="AesKey">key</param> 
    /// <param name="AesIV">向量128</param> 
    /// <returns name="result">解密后的字符串</returns> 
    public string AESDecrypt(string inputdata) 
    { 
      try 
      { 
        AesIV = AesIV.Replace(" ", "+"); 
        AesKey = AesKey.Replace(" ", "+"); 
        inputdata = inputdata.Replace(" ", "+"); 
        byte[] encryptedData = Convert.FromBase64String(inputdata); 
 
        RijndaelManaged rijndaelCipher = new RijndaelManaged(); 
        rijndaelCipher.Key = Convert.FromBase64String(AesKey); // Encoding.UTF8.GetBytes(AesKey); 
        rijndaelCipher.IV = Convert.FromBase64String(AesIV);// Encoding.UTF8.GetBytes(AesIV); 
        rijndaelCipher.Mode = CipherMode.CBC; 
        rijndaelCipher.Padding = PaddingMode.PKCS7; 
        ICryptoTransform transform = rijndaelCipher.CreateDecryptor(); 
        byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length); 
        string result = Encoding.UTF8.GetString(plainText); 
 
        return result; 
      } 
      catch (Exception) 
      { 
        return null; 
 
      } 
    } 
    #endregion 
  } 
}

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