MemberCenter/JCWXCore-master/PublicLibrary/Common.Wechat/WechatHelper.cs

 using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using Microsoft.AspNetCore.Http;
using Common;
using ZcPeng.weixin.PublicAccount;
using Newtonsoft.Json;
using JCSoft.WX.Framework.Models.ApiRequests;
using JCSoft.WX.Framework.Models;
using Microsoft.AspNetCore.Authentication.Cookies;
using System.Security.Claims;
using JCSoft.WX.Framework.Api;
using Microsoft.AspNetCore.Authentication;
using JCSoft.WX.Framework.Models.ApiResponses;

namespace Common.Wechat
{
    public class WechatHelper
    {
        /// <summary>
        /// 验证微信签名
        /// </summary>
        public static bool CheckSignature(string token, string signature, string timestamp, string nonce)
        {
            string[] ArrTmp = { token, timestamp, nonce };

            Array.Sort(ArrTmp);
            string tmpStr = string.Join("", ArrTmp);

            //tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
            //tmpStr = Membership.CreateUser(tmpStr, "SHA1");
            tmpStr = tmpStr.ToLower();

            if (tmpStr == signature)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        public static void ReGetOpenId(HttpContext reqContext,string param = "")
        {
            string Appid = Config.WeChatAppKey;
            string Secret = Config.WeChatAppSecret;
            string url = GetAbsoluteUri(reqContext.Request);//获取当前url
            Log log = new Log(AppDomain.CurrentDomain.BaseDirectory + @"/log/Log.txt");
            if (reqContext.Session.GetString("openid") == "" || reqContext.Session.GetString("openid") == null)
            {
                //先要判断是否是获取code后跳转过来的
                if (reqContext.Request.Query["code"].FirstOrDefault()== "" 
                    || reqContext.Request.Query["code"].FirstOrDefault() == null)
                {
                    //Code为空时，先获取Code
                    string GetCodeUrls = GetCodeUrl(url,Appid, "");
                    log.log("获取openid 前 GetCodeUrls：" + GetCodeUrls);
                    reqContext.Response.Redirect(GetCodeUrls);//先跳转到微信的服务器，取得code后会跳回来这页面的
                }
                else
                {
                    //Code非空，已经获取了code后跳回来啦，现在重新获取openid
                    string openid = "";
                    openid = GetOauthAccessOpenId(reqContext.Request.Query["Code"].FirstOrDefault(),Appid, Secret);//重新取得用户的openid
                    reqContext.Session.SetString("openid",openid);
                    log.log("走完获取openid的方法之后，当前Session的值是：" + reqContext.Session.GetString("openid")); 
                }
            }
        }

        #region 重新获取Code的跳转链接(没有用户授权的，只能获取基本信息）
        /// <summary>重新获取Code,以后面实现带着Code重新跳回目标页面(没有用户授权的，只能获取基本信息（openid））</summary>
        /// <param name="url">目标页面</param>
        /// <returns></returns>
        public static string GetCodeUrl(string url,string Appid,string param="")
        {
            Log log = new Log(AppDomain.CurrentDomain.BaseDirectory + @"/log/Log.txt");
            string CodeUrl = "";
            //对url进行编码
            url = System.Web.HttpUtility.UrlEncode(url+ param);
            CodeUrl = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + Appid + "&redirect_uri=" + url 
                + "&response_type=code&scope=snsapi_base&state=1#wechat_redirect");//?action=viewtest
            log.log("拿到code的url是：" + CodeUrl);

            return CodeUrl;

        }
        #endregion


        #region 以Code换取用户的openid、access_token
        /// <summary>根据Code获取用户的openid、access_token</summary>
        public static string GetOauthAccessOpenId(string code,string Appid,string Secret)
        {
            Log log = new Log(AppDomain.CurrentDomain.BaseDirectory + @"/log/Log.txt");
            string Openid = "";
            string url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + Appid + "&secret=" + Secret + "&code=" + code + "&grant_type=authorization_code";
            string result = HttpHelper.HttpGet(url, "application/json");
            log.log("拿到的url是：" + url);
            log.log("获取到的result是" + result);

            var jsonData = JsonConvert.DeserializeAnonymousType(result, new { access_token = "", openid = "", errcode = 0 });
            if (jsonData.errcode != 0)
            {
                return "";
            }
            log.log("能否从html里拿到openid=" + jsonData.openid);
            Openid = jsonData.openid;
            return Openid;
        }
        #endregion
        
        public static string GetAbsoluteUri(HttpRequest request)
        {
            //TODO:delete test code 
            return new StringBuilder()
                //.Append(request.Scheme)
                .Append("https")
                .Append("://")
                //.Append(request.Host)
                //.Append("119.27.191.247")
                .Append(Config.Host)
                .Append(request.PathBase)
                .Append(request.Path)
                .Append(request.QueryString)
                .ToString();
        }

        /// <summary>
        /// 这个方法不用了
        /// </summary>
        /// <param name="_client"></param>
        /// <returns></returns>
        public static AccountInfo getAccessToken(IApiClient _client )
        {
            var info = AccountInfoCollection.GetAccountInfo(Config.WeChatAppName);
            if (info == null || info.Token == null || info.Token == "") { 
                var request = new AccessTokenRequest(new AppIdentication(Config.WeChatAppKey, Config.WeChatAppSecret));

                var response = _client.Execute(request);
                bool IsSuccess = !response.IsError;
                if (!response.IsError)
                {
                    //加入测试公众号
                    AccountInfo account = new AccountInfo(Config.WeChatAppName, Config.WeChatAppKey, Config.WeChatAppSecret, response.Access_Token, null,response.Expires_In);
                    AccountInfoCollection.SetAccountInfo(account);
                    //加入正式公众号
                    //AccountInfoCollection.SetAccountInfo(new AccountInfo("YourId2", "AppId", "AppSecret", "Token", "EncodingAesKey", "非測試"));
                    return account;
                }
                else
                {
                    return null;
                }
            }
            return info;
        }
        
    }

}