WmptWeixin/weixinHelper.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Collections.Specialized;
using System.Web.Security;
using System.Collections;
using WMPT.Common;
using System.Reflection;
using System.IO;

namespace WMPT.Weixin
{
    /// <summary>
    /// 此类主要处理微信相关功能
    /// </summary>
    public class weixinHelper
    {
        const string token = "ihangjing.com";//微信平台设置的
        const string AssemblyPath = "WMPT.Weixin";//用于反射
        protected HttpContext context;

        public weixinHelper(HttpContext _context)
        {
            context = _context;
        }

        /// <summary>
        /// 通过签名，判断是否来自微信的请求,如果是返回 echostr，否则返回error
        ///  加密/校验流程：
        ///  1. 将token、timestamp、nonce三个参数进行字典序排序
        ///  2. 将三个参数字符串拼接成一个字符串进行sha1加密
        ///  3. 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信
        /// </summary>
        /// <returns></returns>
        public string isValidRequest()
        {
            string flag = "error";

            NameValueCollection coll;
            coll = context.Request.Params;
            String[] requestarr = coll.AllKeys;

            string signature = coll["signature"];


            string[] usetovalue = { "token", "nonce", "timestamp" };
            string[] Sortedstr = weixinHelper.BubbleSort(usetovalue);

            StringBuilder originalstr = new StringBuilder();
            foreach (var item in Sortedstr)
            {
                originalstr.Append(coll[item]);
                if (item == "token")
                {
                    originalstr.Append(token);
                }
            }