mp-main/AppStart/Helper/WeChatPayBackService.cs

using System;
using System.Collections.Generic;
using Library;
using LitJson;
using System.Linq;
using MySystem.PxcModels;
using Org.BouncyCastle.Crypto.Modes;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Parameters;
using System.Text;
using System.Threading;

namespace MySystem
{
    public class WeChatPayBackService
    {
        public readonly static WeChatPayBackService Instance = new WeChatPayBackService();
        private WeChatPayBackService()
        { }

        public void Start()
        {
            Thread th = new Thread(dosomething);
            th.IsBackground = true;
            th.Start();
        }

        public void dosomething()
        {
            bool op = true;
            while (op)
            {
                string content = RedisDbconn.Instance.RPop<string>("WeChatPayBack");
                if (!string.IsNullOrEmpty(content))
                {
                    try
                    {
                        JsonData jsonObj = JsonMapper.ToObject(content);
                        if (jsonObj.Count > 0)
                        {
                            if (jsonObj["event_type"].ToString() == "TRANSACTION.SUCCESS")
                            {
                                JsonData resource = jsonObj["resource"];
                                //开始解密
                                string WxPayResourceDecryptModel = AesGcmDecrypt(resource["associated_data"].ToString(), resource["nonce"].ToString(), resource["ciphertext"].ToString());
                                // {\"sp_mchid\":\"1611167423\",\"sub_mchid\":\"1622024882\",\"sp_appid\":\"wxe2c051b3e46c0f6f\",\"out_trade_no\":\"2022022621562926396898863\",\"transaction_id\":\"4200001412202202267619496496\",\"trade_type\":\"JSAPI\",\"trade_state\":\"SUCCESS\",\"trade_state_desc\":\"支付成功\",\"bank_type\":\"OTHERS\",\"attach\":\"\",\"success_time\":\"2022-02-26T21:56:42+08:00\",\"payer\":{\"sp_openid\":\"omawy5W6jb0pgPfuKUVs6K3bEhzk\",\"sub_openid\":\"\"},\"amount\":{\"total\":1,\"payer_total\":1,\"currency\":\"CNY\",\"payer_currency\":\"CNY\"}}
                                JsonData orderObj = JsonMapper.ToObject(WxPayResourceDecryptModel);
                                string OrderNo = orderObj["out_trade_no"].ToString();
                                WebCMSEntities db = new WebCMSEntities();
                                ConsumerOrderForNo forNo = db.ConsumerOrderForNo.FirstOrDefault(m => m.OrderNo == OrderNo);
                                if (forNo != null)
                                {
                                    ConsumerOrders order = db.ConsumerOrders.FirstOrDefault(m => m.Id == forNo.OrderIds && m.Status == 0);
                                    if (order != null)
                                    {
                                        order.Status = 1;
                                        order.UpdateDate = DateTime.Now;
                                        order.PayMoney = order.PayMoney;
                                        order.MaxDivi = order.MaxDivi;
                                        db.SaveChanges();
                                        RedisDbconn.Instance.AddList("ConsumerOrdersStat", order.Id);
                                        RedisDbconn.Instance.AddList("ConsumerOrders:Divi:List", order.Id.ToString());
                                        RedisDbconn.Instance.AddRightList("ConsumerOrders:Divi:" + order.MerchantId, order);
                                        // ConsumerOrdersStatService.Instance.Stat(order);
                                    }
                                }
                                db.Dispose();
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        function.WriteLog(DateTime.Now.ToString() + ":" + ex.ToString(), "public_service");
                    }
                }
                else
                {
                    op = false;
                }
            }
        }

        private string ALGORITHM = "AES/GCM/NoPadding";
        private int TAG_LENGTH_BIT = 128;
        private int NONCE_LENGTH_BYTE = 12;

        public string AesGcmDecrypt(string associatedData, string nonce, string ciphertext)
        {
            GcmBlockCipher gcmBlockCipher = new GcmBlockCipher(new AesEngine());
            AeadParameters aeadParameters = new AeadParameters(
                new KeyParameter(Encoding.UTF8.GetBytes(AppConfig.WeChatParam.AesGemKey)),
                128,
                Encoding.UTF8.GetBytes(nonce),
                Encoding.UTF8.GetBytes(associatedData));
            gcmBlockCipher.Init(false, aeadParameters);

            byte[] data = Convert.FromBase64String(ciphertext);
            byte[] plaintext = new byte[gcmBlockCipher.GetOutputSize(data.Length)];
            int length = gcmBlockCipher.ProcessBytes(data, 0, data.Length, plaintext, 0);
            gcmBlockCipher.DoFinal(plaintext, length);
            return Encoding.UTF8.GetString(plaintext);
        }
    }
}