WeChat Development-ACCESS TOKEN Expiration Solution

WeChat Development-ACCESS TOKEN Expiration Solution

Cause: Because of the importance of access_token, everyone who has developed WeChat knows it, but it has its own life cycle. The official explanation is: "The validity period is 7200 seconds ", called 2,000 times a day. Once the traffic is high, it will be over. There is no way. If Brother Long doesn't help us solve the problem, we have to solve it ourselves. We can't wait to die.

The solution is very simple: create public access token data, and do not re-create access_token during the validity period.

Solution:
1. WeChat class library: directly read the json data in the access token data file during the validity period. When it expires, re-obtain and create new access token data. File
2, data file: stores valid access token data, specifically: access_token.json and jsapi_ticket.json

The core code is as follows:

Index: wxjsSDK.cs
===================================================================
--- wxjsSDK.cs	(revision 0)
+++ wxjsSDK.cs	(revision 1)
@@ -0,0 +1,209 @@
+using System;
+using System.Collections.Generic;
+using System.Web;
+using System.IO;
+using System.Security.Cryptography;
+using System.Runtime.Serialization.Json;
+using System.Runtime.Serialization;
+using System.Net;
+using System.Runtime.Serialization.Formatters.Binary;
+using System.Text; 
+
+namespace JR.Common
+{
+    public class wxjsSDK
+    {
+        private string appId; 
+        private string appSecret;
+
+
+        public wxjsSDK(string appId, string appSecret) 
+        { 
+            this.appId = appId; 
+            this.appSecret = appSecret; 
+        } 
+   
+   
+   
+        //得到数据包，返回使用页面 
+        public System.Collections.Hashtable getSignPackage() 
+        { 
+            string jsapiTicket = getJsApiTicket(); 
+            string url = HttpContext.Current.Request.Url.ToString(); //"http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]"; 
+            string timestamp = Convert.ToString(ConvertDateTimeInt(DateTime.Now)); 
+            string nonceStr = createNonceStr(); 
+            // 这里参数的顺序要按照 key 值 ASCII 码升序排序 
+            string rawstring = "jsapi_ticket=" + jsapiTicket + "&noncestr=" + nonceStr + "&timestamp=" + timestamp + "&url=" + url + ""; 
+            string signature = SHA1_Hash(rawstring); 
+            var signPackage = new System.Collections.Hashtable(); 
+            signPackage.Add("appId", appId); 
+            signPackage.Add("nonceStr", nonceStr); 
+            signPackage.Add("timestamp", timestamp); 
+            signPackage.Add("url", url); 
+            signPackage.Add("signature", signature); 
+            signPackage.Add("rawString", rawstring); 
+            return signPackage; 
+        } 
+   
+   
+        //创建随机字符串 
+        private string createNonceStr()
+        {
+            int length = 16;
+            string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+            string str = "";
+            var rad = new Random();
+            for (int i = 0; i < length; i++)
+            {
+                str += chars.Substring(rad.Next(0, chars.Length - 1), 1);
+            }
+            return str;
+        }
+
+
+        //得到ticket 如果文件里时间 超时则重新获取 
+        private string getJsApiTicket()
+        {
+            string ticket = "";
+            // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例 
+            string path = HttpContext.Current.Server.MapPath(@"/log/jssdk/jsapi_ticket.json");
+            if (!File.Exists(path))
+            {
+                File.Create(path).Close();
+            }
+            StreamReader sr = new StreamReader(path, System.Text.Encoding.Default);
+            string filecontent = sr.ReadToEnd();
+            CommonJsonModel jsonModel = null;
+            if (!string.IsNullOrEmpty(filecontent))
+            {
+                jsonModel = new CommonJsonModel(filecontent);
+            }
+            sr.Close();
+            sr.Dispose();
+            if (jsonModel == null || int.Parse(jsonModel.GetValue("expires_in")) < ConvertDateTimeInt(DateTime.Now))
+            {
+                string accessToken = getAccessToken();
+                string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=" + accessToken;
+                jsonModel = new CommonJsonModel(httpGet(url));
+                ticket = jsonModel.GetValue("ticket");
+                if (ticket != "")
+                {
+                    string json = "{\"ticket\":\"" + ticket + "\",\"expires_in\":" + (ConvertDateTimeInt(DateTime.Now) + 7000) + "}";
+                    StreamWriterMetod(json, path);
+                }
+            }
+            else
+            {
+                ticket = jsonModel.GetValue("ticket");
+            }
+            return ticket;
+        }
+
+
+        //得到accesstoken 如果文件里时间 超时则重新获取 
+        private string getAccessToken()
+        {
+            // access_token 应该全局存储与更新，以下代码以写入到文件中做示例 
+            string access_token = "";
+            string path = HttpContext.Current.Server.MapPath(@"/log/jssdk/access_token.json");
+            if (!File.Exists(path))
+            {
+                File.Create(path).Close();
+            }
+            StreamReader sr = new StreamReader(path, System.Text.Encoding.Default);
+            string filecontent = sr.ReadToEnd();
+            CommonJsonModel jsonModel = null;
+            if (!string.IsNullOrEmpty(filecontent))
+            {
+                jsonModel = new CommonJsonModel(filecontent);
+            }
+            sr.Close();
+            sr.Dispose();
+            if (jsonModel == null || int.Parse(jsonModel.GetValue("expires_in")) < ConvertDateTimeInt(DateTime.Now))
+            {
+                string url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId +
+                             "&secret=" + appSecret + "";
+                jsonModel = new CommonJsonModel(httpGet(url));
+                access_token = jsonModel.GetValue("access_token");
+                if (access_token != "")
+                {
+                    string json = "{\"access_token\":\"" + access_token + "\",\"expires_in\":" + (ConvertDateTimeInt(DateTime.Now) + 7000) + "}";
+                    StreamWriterMetod(json, path);
+                }
+            }
+            else
+            {
+                access_token = jsonModel.GetValue("access_token");
+            }
+            return access_token;
+        }
+
+
+        //发起一个http请球，返回值 
+        private string httpGet(string url) 
+        {
+            try
+            {
+                var MyWebClient = new WebClient();
+                MyWebClient.Credentials = CredentialCache.DefaultCredentials; //获取或设置用于向Internet资源的请求进行身份验证的网络凭据 
+                Byte[] pageData = MyWebClient.DownloadData(url); //从指定网站下载数据 
+                string pageHtml = System.Text.Encoding.Default.GetString(pageData);//如果获取网站页面采用的是GB2312，则使用这句             
+                //string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8，则使用这句 
+                return pageHtml;
+            }
+            catch (WebException webEx)
+            {
+                Console.WriteLine(webEx.Message.ToString());
+                return null;
+            }
+        } 
+   
+   
+        //SHA1哈希加密算法 
+        private string SHA1_Hash(string str_sha1_in) 
+        { 
+            SHA1 sha1 = new SHA1CryptoServiceProvider(); 
+            byte[] bytes_sha1_in = System.Text.UTF8Encoding.Default.GetBytes(str_sha1_in); 
+            byte[] bytes_sha1_out = sha1.ComputeHash(bytes_sha1_in); 
+            string str_sha1_out = BitConverter.ToString(bytes_sha1_out); 
+            str_sha1_out = str_sha1_out.Replace("-", "").ToLower(); 
+            return str_sha1_out; 
+        } 
+   
+   
+        /// <summary> 
+        /// StreamWriter写入文件方法 
+        /// </summary> 
+        private void StreamWriterMetod(string str, string patch) 
+        {
+            FileStream stream = new FileStream(patch, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Delete | FileShare.ReadWrite);
+            StreamWriter writer = new StreamWriter(stream);
+            writer.WriteLine(str);
+            stream.Flush();
+            writer.Close();
+            stream.Close();
+            stream.Dispose();
+            writer.Dispose();
+        } 
+  
+   
+   
+   
+        /// <summary> 
+        /// 将c# DateTime时间格式转换为Unix时间戳格式 
+        /// </summary> 
+        /// <param name="time">时间</param> 
+        /// <returns>double</returns> 
+        private int ConvertDateTimeInt(System.DateTime time) 
+        { 
+            int intResult = 0; 
+            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); 
+            intResult = Convert.ToInt32((time - startTime).TotalSeconds); 
+            return intResult; 
+        } 
+
+
+    }
+
+
+}
 
 
access_token.json
{"access_token":"4H14BVCUrAxxxxxxxxxxxxWeLu-zKETaBYqsoKFjsHZDc3xOwc-m43WDw2HjzxEkng2nC7iJuHydNt5PqRDY7HCoAU4lmuaPoYsIQHdW9kA","expire_time":1428599121}

access_token.json
{"jsapi_ticket":"bxLdikRXVbTPdHSM05e5u1wgoccccccccccccccccccccccccccccc11FFzYsiqbXZN0SDGN6Dnksnt2Q","expire_time":1428599122}

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