.NET Core 企業微信回調配置

2022 年 6 月 17 日
筆記
企業微信

1.配置API接收

2.下載加密解密庫

地址：//developer.work.weixin.qq.com/devtool/introduce?id=36388，也可以複製下面的代碼

2.1 WXBizMsgCrypt.cs

　　該方法封裝了VerifyURL, DecryptMsg, EncryptMsg三個接口，分別用於開發者驗證回調url，收到用戶回復消息的解密以及開發者回復消息的加密過程。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Collections;
//using System.Web;
using System.Security.Cryptography;
//-40001 ： 簽名驗證錯誤
//-40002 :  xml解析失敗
//-40003 :  sha加密生成簽名失敗
//-40004 :  AESKey 非法
//-40005 :  corpid 校驗錯誤
//-40006 :  AES 加密失敗
//-40007 ： AES 解密失敗
//-40008 ： 解密後得到的buffer非法
//-40009 :  base64加密異常
//-40010 :  base64解密異常
namespace Entity
{
    public class WXBizMsgCrypt
    {
        string m_sToken;
        string m_sEncodingAESKey;
        string m_sReceiveId;
        enum WXBizMsgCryptErrorCode
        {
            WXBizMsgCrypt_OK = 0,
            WXBizMsgCrypt_ValidateSignature_Error = -40001,
            WXBizMsgCrypt_ParseXml_Error = -40002,
            WXBizMsgCrypt_ComputeSignature_Error = -40003,
            WXBizMsgCrypt_IllegalAesKey = -40004,
            WXBizMsgCrypt_ValidateCorpid_Error = -40005,
            WXBizMsgCrypt_EncryptAES_Error = -40006,
            WXBizMsgCrypt_DecryptAES_Error = -40007,
            WXBizMsgCrypt_IllegalBuffer = -40008,
            WXBizMsgCrypt_EncodeBase64_Error = -40009,
            WXBizMsgCrypt_DecodeBase64_Error = -40010
        };

        //構造函數
        // @param sToken: 企業微信後台，開發者設置的Token
        // @param sEncodingAESKey: 企業微信後台，開發者設置的EncodingAESKey
        // @param sReceiveId: 不同場景含義不同，詳見文檔說明
        public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string sReceiveId)
        {
            m_sToken = sToken;
            m_sReceiveId = sReceiveId;
            m_sEncodingAESKey = sEncodingAESKey;
        }

        //驗證URL
        // @param sMsgSignature: 簽名串，對應URL參數的msg_signature
        // @param sTimeStamp: 時間戳，對應URL參數的timestamp
        // @param sNonce: 隨機串，對應URL參數的nonce
        // @param sEchoStr: 隨機串，對應URL參數的echostr
        // @param sReplyEchoStr: 解密之後的echostr，當return返回0時有效
        // @return：成功0，失敗返回對應的錯誤碼
        public int VerifyURL(string sMsgSignature, string sTimeStamp, string sNonce, string sEchoStr, ref string sReplyEchoStr)
        {
            int ret = 0;
            if (m_sEncodingAESKey.Length!=43)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
            }
            ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEchoStr, sMsgSignature);
            if (0 != ret)
            {
                return ret;
            }
            sReplyEchoStr = "";
            string cpid = "";
            try
            {
                sReplyEchoStr = Cryptography.AES_decrypt(sEchoStr, m_sEncodingAESKey, ref cpid); //m_sReceiveId);
            }
            catch (Exception)
            {
                sReplyEchoStr = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
            }
            if (cpid != m_sReceiveId)
            {
                sReplyEchoStr = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
            }
            return 0;
        }

        // 檢驗消息的真實性，並且獲取解密後的明文
        // @param sMsgSignature: 簽名串，對應URL參數的msg_signature
        // @param sTimeStamp: 時間戳，對應URL參數的timestamp
        // @param sNonce: 隨機串，對應URL參數的nonce
        // @param sPostData: 密文，對應POST請求的數據
        // @param sMsg: 解密後的原文，當return返回0時有效
        // @return: 成功0，失敗返回對應的錯誤碼
        public int DecryptMsg(string sMsgSignature, string sTimeStamp, string sNonce, string sPostData, ref string sMsg)
        {
            if (m_sEncodingAESKey.Length!=43)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
            }
            XmlDocument doc = new XmlDocument();
            XmlNode root;
            string sEncryptMsg;
            try
            {
                doc.LoadXml(sPostData);
                root = doc.FirstChild;
                sEncryptMsg = root["Encrypt"].InnerText;
            }
            catch (Exception)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ParseXml_Error;
            }
            //verify signature
            int ret = 0;
            ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEncryptMsg, sMsgSignature);
            if (ret != 0)
                return ret;
            //decrypt
            string cpid = "";
            try
            {
                sMsg = Cryptography.AES_decrypt(sEncryptMsg, m_sEncodingAESKey, ref cpid);
            }
            catch (FormatException)
            {
                sMsg = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecodeBase64_Error;
            }
            catch (Exception)
            {
                sMsg = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
            }
            if (cpid != m_sReceiveId)
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
            return 0;
        }

        //將企業號回復用戶的消息加密打包
        // @param sReplyMsg: 企業號待回復用戶的消息，xml格式的字符串
        // @param sTimeStamp: 時間戳，可以自己生成，也可以用URL參數的timestamp
        // @param sNonce: 隨機串，可以自己生成，也可以用URL參數的nonce
        // @param sEncryptMsg: 加密後的可以直接回復用戶的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串,
        //                        當return返回0時有效
        // return：成功0，失敗返回對應的錯誤碼
        public int EncryptMsg(string sReplyMsg, string sTimeStamp, string sNonce, ref string sEncryptMsg)
        {
            if (m_sEncodingAESKey.Length!=43)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
            }
            string raw = "";
            try
            {
                raw = Cryptography.AES_encrypt(sReplyMsg, m_sEncodingAESKey, m_sReceiveId);
            }
            catch (Exception)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_EncryptAES_Error;
            }
            string MsgSigature = "";
            int ret = 0;
            ret = GenarateSinature(m_sToken, sTimeStamp, sNonce, raw, ref MsgSigature);
            if (0 != ret)
                return ret;
            sEncryptMsg = "";

            string EncryptLabelHead = "<Encrypt><![CDATA[";
            string EncryptLabelTail = "]]></Encrypt>";
            string MsgSigLabelHead = "<MsgSignature><![CDATA[";
            string MsgSigLabelTail = "]]></MsgSignature>";
            string TimeStampLabelHead = "<TimeStamp><![CDATA[";
            string TimeStampLabelTail = "]]></TimeStamp>";
            string NonceLabelHead = "<Nonce><![CDATA[";
            string NonceLabelTail = "]]></Nonce>";
            sEncryptMsg = sEncryptMsg + "<xml>" + EncryptLabelHead + raw + EncryptLabelTail;
            sEncryptMsg = sEncryptMsg + MsgSigLabelHead + MsgSigature + MsgSigLabelTail;
            sEncryptMsg = sEncryptMsg + TimeStampLabelHead + sTimeStamp + TimeStampLabelTail;
            sEncryptMsg = sEncryptMsg + NonceLabelHead + sNonce + NonceLabelTail;
            sEncryptMsg += "</xml>";
            return 0;
        }

        public class DictionarySort : System.Collections.IComparer
        {
            public int Compare(object oLeft, object oRight)
            {
                string sLeft = oLeft as string;
                string sRight = oRight as string;
                int iLeftLength = sLeft.Length;
                int iRightLength = sRight.Length;
                int index = 0;
                while (index < iLeftLength && index < iRightLength)
                {
                    if (sLeft[index] < sRight[index])
                        return -1;
                    else if (sLeft[index] > sRight[index])
                        return 1;
                    else
                        index++;
                }
                return iLeftLength - iRightLength;

            }
        }
        //Verify Signature
        private static int VerifySignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, string sSigture)
        {
            string hash = "";
            int ret = 0;
            ret = GenarateSinature(sToken, sTimeStamp, sNonce, sMsgEncrypt, ref hash);
            if (ret != 0)
                return ret;
            if (hash == sSigture)
                return 0;
            else
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateSignature_Error;
            }
        }

        public static int GenarateSinature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt ,ref string sMsgSignature)
        {
            ArrayList AL = new ArrayList();
            AL.Add(sToken);
            AL.Add(sTimeStamp);
            AL.Add(sNonce);
            AL.Add(sMsgEncrypt);
            AL.Sort(new DictionarySort());
            string raw = "";
            for (int i = 0; i < AL.Count; ++i)
            {
                raw += AL[i];
            }

            SHA1 sha;
            ASCIIEncoding enc;
            string hash = "";
            try
            {
                sha = new SHA1CryptoServiceProvider();
                enc = new ASCIIEncoding();
                byte[] dataToHash = enc.GetBytes(raw);
                byte[] dataHashed = sha.ComputeHash(dataToHash);
                hash = BitConverter.ToString(dataHashed).Replace("-", "");
                hash = hash.ToLower();
            }
            catch (Exception)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ComputeSignature_Error;
            }
            sMsgSignature = hash;
            return 0;
        }
    }
}

2.2 Cryptography.cs

　　該文件封裝了AES加解密過程

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using System.Net;
namespace Entity
{
    public class Cryptography
    {
        public static UInt32 HostToNetworkOrder(UInt32 inval)
        {
            UInt32 outval = 0;
            for (int i = 0; i < 4; i++)
                outval = (outval << 8) + ((inval >> (i * 8)) & 255);
            return outval;
        }

        public static Int32 HostToNetworkOrder(Int32 inval)
        {
            Int32 outval = 0;
            for (int i = 0; i < 4; i++)
                outval = (outval << 8) + ((inval >> (i * 8)) & 255);
            return outval;
        }
        /// <summary>
        /// 解密方法
        /// </summary>
        /// <param name="Input">密文</param>
        /// <param name="EncodingAESKey"></param>
        /// <returns></returns>
        /// 
        public static string AES_decrypt(String Input, string EncodingAESKey, ref string corpid)
        {
            byte[] Key;
            Key = Convert.FromBase64String(EncodingAESKey + "=");
            byte[] Iv = new byte[16];
            Array.Copy(Key, Iv, 16);
            byte[] btmpMsg = AES_decrypt(Input, Iv, Key);

            int len = BitConverter.ToInt32(btmpMsg, 16);
            len = IPAddress.NetworkToHostOrder(len);


            byte[] bMsg = new byte[len];
            byte[] bCorpid = new byte[btmpMsg.Length - 20 - len];
            Array.Copy(btmpMsg, 20, bMsg, 0, len);
            Array.Copy(btmpMsg, 20+len , bCorpid, 0, btmpMsg.Length - 20 - len);
            string oriMsg = Encoding.UTF8.GetString(bMsg);
            corpid = Encoding.UTF8.GetString(bCorpid);

            
            return oriMsg;
        }

        public static String AES_encrypt(String Input, string EncodingAESKey, string corpid)
        {
            byte[] Key;
            Key = Convert.FromBase64String(EncodingAESKey + "=");
            byte[] Iv = new byte[16];
            Array.Copy(Key, Iv, 16);
            string Randcode = CreateRandCode(16);
            byte[] bRand = Encoding.UTF8.GetBytes(Randcode);
            byte[] bCorpid = Encoding.UTF8.GetBytes(corpid);
            byte[] btmpMsg = Encoding.UTF8.GetBytes(Input);
            byte[] bMsgLen = BitConverter.GetBytes(HostToNetworkOrder(btmpMsg.Length));
            byte[] bMsg = new byte[bRand.Length + bMsgLen.Length + bCorpid.Length + btmpMsg.Length];

            Array.Copy(bRand, bMsg, bRand.Length);
            Array.Copy(bMsgLen, 0, bMsg, bRand.Length, bMsgLen.Length);
            Array.Copy(btmpMsg, 0, bMsg, bRand.Length + bMsgLen.Length, btmpMsg.Length);
            Array.Copy(bCorpid, 0, bMsg, bRand.Length + bMsgLen.Length + btmpMsg.Length, bCorpid.Length);
   
            return AES_encrypt(bMsg, Iv, Key);

        }
        private static string CreateRandCode(int codeLen)
        {
            string codeSerial = "2,3,4,5,6,7,a,c,d,e,f,h,i,j,k,m,n,p,r,s,t,A,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,U,V,W,X,Y,Z";
            if (codeLen == 0)
            {
                codeLen = 16;
            }
            string[] arr = codeSerial.Split(',');
            string code = "";
            int randValue = -1;
            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
            for (int i = 0; i < codeLen; i++)
            {
                randValue = rand.Next(0, arr.Length - 1);
                code += arr[randValue];
            }
            return code;
        }

        private static String AES_encrypt(String Input, byte[] Iv, byte[] Key)
        {
            var aes = new RijndaelManaged();
            //秘鑰的大小，以位為單位
            aes.KeySize = 256;
            //支持的塊大小
            aes.BlockSize = 128;
            //填充模式
            aes.Padding = PaddingMode.PKCS7;
            aes.Mode = CipherMode.CBC;
            aes.Key = Key;
            aes.IV = Iv;
            var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
            byte[] xBuff = null;

            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
                {
                    byte[] xXml = Encoding.UTF8.GetBytes(Input);
                    cs.Write(xXml, 0, xXml.Length);
                }
                xBuff = ms.ToArray();
            }
            String Output = Convert.ToBase64String(xBuff);
            return Output;
        }

        private static String AES_encrypt(byte[] Input, byte[] Iv, byte[] Key)
        {
            var aes = new RijndaelManaged();
            //秘鑰的大小，以位為單位
            aes.KeySize = 256;
            //支持的塊大小
            aes.BlockSize = 128;
            //填充模式
            //aes.Padding = PaddingMode.PKCS7;
            aes.Padding = PaddingMode.None;
            aes.Mode = CipherMode.CBC;
            aes.Key = Key;
            aes.IV = Iv;
            var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
            byte[] xBuff = null;

            #region 自己進行PKCS7補位，用系統自己帶的不行
            byte[] msg = new byte[Input.Length + 32 - Input.Length % 32];
            Array.Copy(Input, msg, Input.Length);
            byte[] pad = KCS7Encoder(Input.Length);
            Array.Copy(pad, 0, msg, Input.Length, pad.Length);
            #endregion

            #region 注釋的也是一種方法，效果一樣
            //ICryptoTransform transform = aes.CreateEncryptor();
            //byte[] xBuff = transform.TransformFinalBlock(msg, 0, msg.Length);
            #endregion

            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
                {
                    cs.Write(msg, 0, msg.Length);
                }
                xBuff = ms.ToArray();
            }

            String Output = Convert.ToBase64String(xBuff);
            return Output;
        }

        private static byte[] KCS7Encoder(int text_length)
        {
            int block_size = 32;
            // 計算需要填充的位數
            int amount_to_pad = block_size - (text_length % block_size);
            if (amount_to_pad == 0)
            {
                amount_to_pad = block_size;
            }
            // 獲得補位所用的字符
            char pad_chr = chr(amount_to_pad);
            string tmp = "";
            for (int index = 0; index < amount_to_pad; index++)
            {
                tmp += pad_chr;
            }
            return Encoding.UTF8.GetBytes(tmp);
        }
        /**
         * 將數字轉化成ASCII碼對應的字符，用於對明文進行補碼
         * 
         * @param a 需要轉化的數字
         * @return 轉化得到的字符
         */
        static char chr(int a)
        {

            byte target = (byte)(a & 0xFF);
            return (char)target;
        }
        private static byte[] AES_decrypt(String Input, byte[] Iv, byte[] Key)
        {
            RijndaelManaged aes = new RijndaelManaged();
            aes.KeySize = 256;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.None;
            aes.Key = Key;
            aes.IV = Iv;
            var decrypt = aes.CreateDecryptor(aes.Key, aes.IV);
            byte[] xBuff = null;
            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write))
                {
                    byte[] xXml = Convert.FromBase64String(Input);
                    byte[] msg = new byte[xXml.Length + 32 - xXml.Length % 32];
                    Array.Copy(xXml, msg, xXml.Length);
                    cs.Write(xXml, 0, xXml.Length);
                }
                xBuff = decode2(ms.ToArray());
            }
            return xBuff;
        }
        private static byte[] decode2(byte[] decrypted)
        {
            int pad = (int)decrypted[decrypted.Length - 1];
            if (pad < 1 || pad > 32)
            {
                pad = 0;
            }
            byte[] res = new byte[decrypted.Length - pad];
            Array.Copy(decrypted, 0, res, 0, decrypted.Length - pad);
            return res;
        }
    }
}

3.編寫回調API

3.1 支持Http Get請求驗證URL有效性

假設企業的接收消息的URL設置為//api.com/callback/interAspect

企業管理員在保存回調配置信息時，企業微信會發送一條驗證消息到填寫的URL，請求內容如下：

請求方式：GET
請求地址：//api.com/callback/interAspect?msg_signature=ASDFQWEXZCVAQFASDFASDFSS&timestamp=13500001234&nonce=123412323&echostr=ENCRYPT_STR

參數說明：

參數	類型	說明
msg_signature	String	企業微信加密簽名，msg_signature計算結合了企業填寫的token、請求中的timestamp、nonce、加密的消息體。簽名計算方法參考消息體簽名檢驗
timestamp	Integer	時間戳。與nonce結合使用，用於防止請求重放攻擊。
nonce	String	隨機數。與timestamp結合使用，用於防止請求重放攻擊。
echostr	String	加密的字符串。需要解密得到消息內容明文，解密後有random、msg_len、msg、receiveid四個字段，其中msg即為消息內容明文

    [HttpGet, Route("callback/interAspect")]
        public ContentResult ReveiceMsg(string msg_signature,string timestamp,string nonce,string echostr)
        {
            //驗證
            WXBizMsgCrypt wxcpt = new WXBizMsgCrypt(AppSetting.Configuration["Wx:CallBackToken"]
                , AppSetting.Configuration["Wx:EncodingAESKey"]
                , AppSetting.Configuration["Wx:corpid"]);
            
            int ret = 0;
            string sEchoStr = "";
            ret = wxcpt.VerifyURL(msg_signature, timestamp, nonce, echostr, ref sEchoStr);
            if (ret != 0)
            {
                return Content(null);
            }

            return Content(sEchoStr);
        }

3.2支持Http Post請求接收業務數據

假設企業的接收消息的URL設置為//api.com/callback/interAspect。
當用戶觸發回調行為時，企業微信會發送回調消息到填寫的URL，請求內容如下：
請求方式：POST
請求地址：//api.com/callback/interAspect?msg_signature=ASDFQWEXZCVAQFASDFASDFSS&timestamp=13500001234&nonce=123412323

參數說明：

參數	類型	說明
msg_signature	String	企業微信加密簽名，msg_signature結合了企業填寫的token、請求中的timestamp、nonce參數、加密的消息體
timestamp	Integer	時間戳。與nonce結合使用，用於防止請求重放攻擊。
nonce	String	隨機數。與timestamp結合使用，用於防止請求重放攻擊。
ToUserName	String	企業微信的CorpID，當為第三方應用回調事件時，CorpID的內容為suiteid
AgentID	String	接收的應用id，可在應用的設置頁面獲取。僅應用相關的回調會帶該字段。
Encrypt	String	消息結構體加密後的字符串

其中Encrypt為Xml格式，需要從請求體獲取。

[HttpPost, Route("callback/interAspect")]
        public ContentResult AcceptMessage(string msg_signature,string timestamp,string nonce)
        {
            //獲取Encrypt參數
            string encrypt = "";
            using (StreamReader sr = new StreamReader(Request.Body, Encoding.UTF8))
            {
                encrypt = sr.ReadToEndAsync().Result;

            }
            //驗證
            WXBizMsgCrypt wxcpt = new WXBizMsgCrypt(AppSetting.Configuration["Wx:CallBackToken"]
                , AppSetting.Configuration["Wx:EncodingAESKey"]
                , AppSetting.Configuration["Wx:corpid"]);

            string sMsg = "";  // 解析之後的明文
            int ret = wxcpt.DecryptMsg(msg_signature, timestamp, nonce, encrypt, ref sMsg);
            if (ret != 0)
            {
                throw new Exception();
            }
            // ret==0表示解密成功，sMsg表示解密之後的明文xml串
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(sMsg);
            XmlNode root = doc.FirstChild;

            string userName = root["FromUserName"].InnerText;
            string eventKey = root["EventKey"].InnerText;
            string responseCode = root["ResponseCode"].InnerText;

            //這邊寫回調業務邏輯 
             return Content("成功");
        }

4.寫在最後

1.測試回調模式地址,位置建立連接 => 測試回調模式，用於測試Get接口是否具備解密能力，

鏈接//open.work.weixin.qq.com/wwopen/devtool/interface/combine

2.openapi回調地址請求不通過: //www.cnblogs.com/zspwf/p/16381688.html

3. POST回調不執行: 可能產生的原因有錯誤接收Encrypt參數，需注意Encrypt參數為Xml類型。Post無法調試，需發佈到服務器中，可通過輸出到系統日誌，獲取報錯原因。

4.域名必須為公網域名。

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