钉钉企业微应用开发C#-HTTP回调接口

官方的STREAM回调推送的方式，试了几次都认证不过，就放弃了还是用HTTP的模式吧。


        /// 
        /// 应用回调
        /// 
        /// 
        /// 
        public static Dictionary<string, string> CallBack(DingCallBackModel model)
        {
            WriteLogHelper.WriteLogsAsync(JsonHelper.SerializeObject(model), "实例回调日志");
            var timeStamp = GetTimestamp(DateTime.Now).ToString();
            // 2. 使用加解密类型
            DingTalkEncryptor callbackCrypto = new DingTalkEncryptor(AppsettingsConfig.DingDingConfig.Token, AppsettingsConfig.DingDingConfig.AesKey, AppsettingsConfig.DingDingConfig.AppKey);
            string decryptMsg = callbackCrypto.getDecryptMsg(model.Msg_signature, model.TimeStamp, model.Nonce, model.Encrypt);
            string msg = "success";
            // 3. 反序列化回调事件json数据
            var approveModel = JsonHelper.DeserializeObject(decryptMsg);
            WriteLogHelper.WriteLogsAsync(JsonHelper.SerializeObject(approveModel), "实例回调日志-解密");
            var type = approveModel.EventType;
            switch (type)
            {
                case "check_url":
                    WriteLogHelper.WriteLogsAsync("审批回调：" + JsonHelper.SerializeObject(model), "实例回调日志");
                    // 测试回调
                    break;
                case "bpms_instance_change":
                    // 实例改变
                   
                    break;
            }
 
            var rspMsg = callbackCrypto.getEncryptedMap(msg);
            return rspMsg;
        }

check_url就是钉应用后台设置回调URL时传入数据的类型。拿到数据

public string Msg_signature { set; get; } = "";
public string TimeStamp { set; get; }
public string Nonce { set; get; } = "123456";
///

/// 加密后的结果
///

public string Encrypt { set; get; }

分为几部分，前面几项用来解密Encrypt密文的参数。

通过提供的DingTalkEncryptor 的 getDecryptMsg方法来进行解密

得到解密后的内容序列化成对象。


 /**
     * 钉钉开放平台加解密方法
     */
    public class DingTalkEncryptor
    {
        //private static readonly Charset CHARSET = Charset.forName("utf-8");
        //private static readonly Base64         base64  = new Base64();
        private byte[] aesKey;
        private String token;
        private String corpId;
        /**ask getPaddingBytes key固定长度**/
        private static readonly int AES_ENCODE_KEY_LENGTH = 43;
        /**加密随机字符串字节长度**/
        private static readonly int RANDOM_LENGTH = 16;
 
        /**
         * 构造函数
         * @param token            钉钉开放平台上，开发者设置的token
         * @param encodingAesKey   钉钉开放台上，开发者设置的EncodingAESKey
         * @param corpId           企业自建应用-事件订阅, 使用appKey
         *                         企业自建应用-注册回调地址, 使用corpId
         *                         第三方企业应用, 使用suiteKey
         *
         * @throws DingTalkEncryptException 执行失败，请查看该异常的错误码和具体的错误信息
         */
        public DingTalkEncryptor(String token, String encodingAesKey, String corpId)
        {
            if (null == encodingAesKey || encodingAesKey.Length != AES_ENCODE_KEY_LENGTH)
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.AES_KEY_ILLEGAL);
            }
            this.token = token;
            this.corpId = corpId;
            aesKey = Convert.FromBase64String(encodingAesKey + "=");
        }
 
        /**
         * 将和钉钉开放平台同步的消息体加密,返回加密Map
         */
        public Dictionary getEncryptedMap(String plaintext)
        {
 
            var time = DateTime.Now.Millisecond;
            return getEncryptedMap(plaintext, time);
        }
 
        /**
         * 将和钉钉开放平台同步的消息体加密,返回加密Map
         * @param plaintext     传递的消息体明文
         * @param timeStamp      时间戳
         * @param nonce           随机字符串
         * @return
         * @throws DingTalkEncryptException
         */
        public Dictionary getEncryptedMap(String plaintext, long timeStamp)
        {
            if (null == plaintext)
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.ENCRYPTION_PLAINTEXT_ILLEGAL);
            }
            var nonce = Utils.getRandomStr(RANDOM_LENGTH);
            if (null == nonce)
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.ENCRYPTION_NONCE_ILLEGAL);
            }
 
            String encrypt = this.encrypt(nonce, plaintext);
            String signature = getSignature(token, timeStamp.ToString(), nonce, encrypt);
            Dictionary resultMap = new Dictionary();
            resultMap["msg_signature"] = signature;
            resultMap["encrypt"] = encrypt;
            resultMap["timeStamp"] = timeStamp.ToString();
            resultMap["nonce"] = nonce;
            return resultMap;
        }
 
        /**
         * 密文解密
         * @param msgSignature     签名串
         * @param timeStamp        时间戳
         * @param nonce             随机串
         * @param encryptMsg       密文
         * @return                  解密后的原文
         * @throws DingTalkEncryptException
         */
        public String getDecryptMsg(String msgSignature, String timeStamp, String nonce, String encryptMsg)
        {
            //校验签名
            String signature = getSignature(token, timeStamp, nonce, encryptMsg);
            if (!signature.Equals(msgSignature))
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_SIGNATURE_ERROR);
            }
            // 解密
            String result = decrypt(encryptMsg);
            return result;
        }
 
 
        /*
         * 对明文加密.
         * @param text 需要加密的明文
         * @return 加密后base64编码的字符串
         */
        private String encrypt(String random, String plaintext)
        {
            try
            {
                byte[] randomBytes = System.Text.Encoding.UTF8.GetBytes(random);// random.getBytes(CHARSET);
                byte[] plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plaintext);// plaintext.getBytes(CHARSET);
                byte[] lengthByte = Utils.int2Bytes(plainTextBytes.Length);
                byte[] corpidBytes = System.Text.Encoding.UTF8.GetBytes(corpId);// corpId.getBytes(CHARSET);
                //MemoryStream byteStream = new MemoryStream();
                var bytestmp = new List<byte>();
                bytestmp.AddRange(randomBytes);
                bytestmp.AddRange(lengthByte);
                bytestmp.AddRange(plainTextBytes);
                bytestmp.AddRange(corpidBytes);
                byte[] padBytes = PKCS7Padding.getPaddingBytes(bytestmp.Count);
                bytestmp.AddRange(padBytes);
                byte[] unencrypted = bytestmp.ToArray();
 
                RijndaelManaged rDel = new RijndaelManaged();
                rDel.Mode = CipherMode.CBC;
                rDel.Padding = PaddingMode.Zeros;
                rDel.Key = aesKey;
                rDel.IV = aesKey.ToList().Take(16).ToArray();
                ICryptoTransform cTransform = rDel.CreateEncryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(unencrypted, 0, unencrypted.Length);
                return Convert.ToBase64String(resultArray, 0, resultArray.Length);
 
 
                //Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
                //SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");
                //IvParameterSpec iv = new IvParameterSpec(aesKey, 0, 16);
                //cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);
                //byte[] encrypted = cipher.doFinal(unencrypted);
                //String result = base64.encodeToString(encrypted);
                //return result;
            }
            catch (Exception e)
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_ENCRYPT_TEXT_ERROR);
            }
        }
 
        /*
         * 对密文进行解密.
         * @param text 需要解密的密文
         * @return 解密得到的明文
         */
        private String decrypt(String text)
        {
            byte[] originalArr;
            try
            {
                byte[] toEncryptArray = Convert.FromBase64String(text);
                RijndaelManaged rDel = new RijndaelManaged();
                rDel.Mode = CipherMode.CBC;
                rDel.Padding = PaddingMode.Zeros;
                rDel.Key = aesKey;
                rDel.IV = aesKey.ToList().Take(16).ToArray();
                ICryptoTransform cTransform = rDel.CreateDecryptor();
                originalArr = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
                //return System.Text.UTF8Encoding.UTF8.GetString(resultArray);
 
                 设置解密模式为AES的CBC模式
                //Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
                //SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");
                //IvParameterSpec iv = new IvParameterSpec(Arrays.copyOfRange(aesKey, 0, 16));
                //cipher.init(Cipher.DECRYPT_MODE, keySpec, iv);
                 使用BASE64对密文进行解码
                //byte[] encrypted = Base64.decodeBase64(text);
                 解密
                //originalArr = cipher.doFinal(encrypted);
            }
            catch (Exception e)
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_DECRYPT_TEXT_ERROR);
            }
 
            String plainText;
            String fromCorpid;
            try
            {
                // 去除补位字符
                byte[] bytes = PKCS7Padding.removePaddingBytes(originalArr);
                Console.Out.WriteLine("bytes size:" + bytes.Length);
 
                // 分离16位随机字符串,网络字节序和corpId
                byte[] networkOrder = bytes.Skip(16).Take(4).ToArray();// Arrays.copyOfRange(bytes, 16, 20);
                for (int i = 0; i < 4; i++)
                {
                    Console.Out.WriteLine("networkOrder size:" + (int)networkOrder[i]);
                }
 
                Console.Out.WriteLine("bytes plainText:" + networkOrder.Length + " " + JsonSerializer.Serialize(networkOrder));
                int plainTextLegth = Utils.bytes2int(networkOrder);
                Console.Out.WriteLine("bytes size:" + plainTextLegth);
 
                plainText = System.Text.UTF8Encoding.UTF8.GetString(bytes.Skip(20).Take(plainTextLegth).ToArray()); // new String(Arrays.copyOfRange(bytes, 20, 20 + plainTextLegth), CHARSET);
                fromCorpid = System.Text.UTF8Encoding.UTF8.GetString(bytes.Skip(20 + plainTextLegth).ToArray()); //new String(Arrays.copyOfRange(bytes, 20 + plainTextLegth, bytes.length), CHARSET);
                Console.Out.WriteLine("bytes plainText:" + plainText);
 
            }
            catch (Exception e)
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_DECRYPT_TEXT_LENGTH_ERROR);
            }
            Console.Out.WriteLine(fromCorpid + "=====" + corpId);
 
 
            // corpid不相同的情况
            if (!fromCorpid.Equals(corpId))
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_DECRYPT_TEXT_CORPID_ERROR);
            }
            return plainText;
        }
 
        /**
         * 数字签名
         * @param token         isv token
         * @param timestamp     时间戳
         * @param nonce          随机串
         * @param encrypt       加密文本
         * @return
         * @throws DingTalkEncryptException
         */
        public String getSignature(String token, String timestamp, String nonce, String encrypt)
        {
            try
            {
                Console.Out.WriteLine(encrypt);
 
                String[] array = new String[] { token, timestamp, nonce, encrypt };
                Array.Sort(array, StringComparer.Ordinal);
                //var tmparray = array.ToList();
                //tmparray.Sort(new JavaStringComper());
                //array = tmparray.ToArray();
                Console.Out.WriteLine("array:" + JsonSerializer.Serialize(array));
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < 4; i++)
                {
                    sb.Append(array[i]);
                }
                String str = sb.ToString();
                Console.Out.WriteLine(str);
                //MessageDigest md = MessageDigest.getInstance("SHA-1");
                //md.update(str.getBytes());
                //byte[] digest = md.digest();
                System.Security.Cryptography.SHA1 hash = System.Security.Cryptography.SHA1.Create();
                System.Text.Encoding encoder = System.Text.Encoding.ASCII;
                byte[] combined = encoder.GetBytes(str);
                byte 转换
                //sbyte[] myByte = new sbyte[]
                //byte[] mySByte = new byte[myByte.Length];
 
 
 
                //for (int i = 0; i < myByte.Length; i++)
 
                //{
 
                //    if (myByte[i] > 127)
 
                //        mySByte[i] = (sbyte)(myByte[i] - 256);
 
                //    else
 
                //        mySByte[i] = (sbyte)myByte[i];
 
                //}
 
                byte[] digest = hash.ComputeHash(combined);
                StringBuilder hexstr = new StringBuilder();
                String shaHex = "";
                for (int i = 0; i < digest.Length; i++)
                {
                    shaHex = ((int)digest[i]).ToString("x");// Integer.toHexString(digest[i] & 0xFF);
                    if (shaHex.Length < 2)
                    {
                        hexstr.Append(0);
                    }
                    hexstr.Append(shaHex);
                }
                return hexstr.ToString();
            }
            catch (Exception e)
            {
                throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_SIGNATURE_ERROR);
            }
        }
    }
 
 
    /**
 * 钉钉开放平台加解密异常类
 */
    public class DingTalkEncryptException : Exception
    {
        /**成功**/
        public static readonly int SUCCESS = 0;
        /**加密明文文本非法**/
        public readonly static int ENCRYPTION_PLAINTEXT_ILLEGAL = 900001;
        /**加密时间戳参数非法**/
        public readonly static int ENCRYPTION_TIMESTAMP_ILLEGAL = 900002;
        /**加密随机字符串参数非法**/
        public readonly static int ENCRYPTION_NONCE_ILLEGAL = 900003;
        /**不合法的aeskey**/
        public readonly static int AES_KEY_ILLEGAL = 900004;
        /**签名不匹配**/
        public readonly static int SIGNATURE_NOT_MATCH = 900005;
        /**计算签名错误**/
        public readonly static int COMPUTE_SIGNATURE_ERROR = 900006;
        /**计算加密文字错误**/
        public readonly static int COMPUTE_ENCRYPT_TEXT_ERROR = 900007;
        /**计算解密文字错误**/
        public readonly static int COMPUTE_DECRYPT_TEXT_ERROR = 900008;
        /**计算解密文字长度不匹配**/
        public readonly static int COMPUTE_DECRYPT_TEXT_LENGTH_ERROR = 900009;
        /**计算解密文字corpid不匹配**/
        public readonly static int COMPUTE_DECRYPT_TEXT_CORPID_ERROR = 900010;
 
        private static Dictionary<int, String> msgMap = new Dictionary<int, String>();
        static DingTalkEncryptException()
        {
            msgMap[SUCCESS] = "成功";
            msgMap[ENCRYPTION_PLAINTEXT_ILLEGAL] = "加密明文文本非法";
            msgMap[ENCRYPTION_TIMESTAMP_ILLEGAL] = "加密时间戳参数非法";
            msgMap[ENCRYPTION_NONCE_ILLEGAL] = "加密随机字符串参数非法";
            msgMap[SIGNATURE_NOT_MATCH] = "签名不匹配";
            msgMap[COMPUTE_SIGNATURE_ERROR] = "签名计算失败";
            msgMap[AES_KEY_ILLEGAL] = "不合法的aes key";
            msgMap[COMPUTE_ENCRYPT_TEXT_ERROR] = "计算加密文字错误";
            msgMap[COMPUTE_DECRYPT_TEXT_ERROR] = "计算解密文字错误";
            msgMap[COMPUTE_DECRYPT_TEXT_LENGTH_ERROR] = "计算解密文字长度不匹配";
            msgMap[COMPUTE_DECRYPT_TEXT_CORPID_ERROR] = "计算解密文字corpid不匹配";
        }
 
        private int code;
        public DingTalkEncryptException(int exceptionCode) : base(msgMap[exceptionCode])
        {
            this.code = exceptionCode;
        }
    }
 
    /*
     * PKCS7算法的加密填充
     */
    public class PKCS7Padding
    {
        //private readonly static Charset CHARSET = Charset.forName("utf-8");
        private readonly static int BLOCK_SIZE = 32;
 
        /**
         * 填充mode字节
         * @param count
         * @return
         */
        public static byte[] getPaddingBytes(int count)
        {
            int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
            if (amountToPad == 0)
            {
                amountToPad = BLOCK_SIZE;
            }
            char padChr = chr(amountToPad);
            String tmp = string.Empty; ;
            for (int index = 0; index < amountToPad; index++)
            {
                tmp += padChr;
            }
            return System.Text.Encoding.UTF8.GetBytes(tmp);
        }
 
        /**
         * 移除mode填充字节
         * @param decrypted
         * @return
         */
        public static byte[] removePaddingBytes(byte[] decrypted)
        {
            int pad = (int)decrypted[decrypted.Length - 1];
            if (pad < 1 || pad > BLOCK_SIZE)
            {
                pad = 0;
            }
            //Array.Copy()
            var output = new byte[decrypted.Length - pad];
            Array.Copy(decrypted, output, decrypted.Length - pad);
            return output;
        }
 
        private static char chr(int a)
        {
            byte target = (byte)(a & 0xFF);
            return (char)target;
        }
 
    }
 
    /**
 * 加解密工具类
 */
    public class Utils
    {
        /**
     *
     * @return
     */
        public static String getRandomStr(int count)
        {
            String baset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
            Random random = new Random();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < count; i++)
            {
                int number = random.Next(baset.Length);
                sb.Append(baset[number]);
            }
            return sb.ToString();
        }
 
 
        /*
         * int转byte数组,高位在前
         */
        public static byte[] int2Bytes(int count)
        {
            byte[] byteArr = new byte[4];
            byteArr[3] = (byte)(count & 0xFF);
            byteArr[2] = (byte)(count >> 8 & 0xFF);
            byteArr[1] = (byte)(count >> 16 & 0xFF);
            byteArr[0] = (byte)(count >> 24 & 0xFF);
            return byteArr;
        }
 
        /**
         * 高位在前bytes数组转int
         * @param byteArr
         * @return
         */
        public static int bytes2int(byte[] byteArr)
        {
            int count = 0;
            for (int i = 0; i < 4; ++i)
            {
                count <<= 8;
                count |= byteArr[i] & 255;
            }
            return count;
        }
    }
 
    public class JavaStringComper : IComparer<string>
    {
        public int Compare(string x, string y)
        {
            return String.Compare(x, y);
        }
    }
 
 
    // 测试加解密的正确性
    public class Program
    {
        public static void Main(string[] args)
        {
 
            String[] a = new String[] { "1", "W", "t" };
 
            var ding = new DingTalkEncryptor("tokenxxxx", "o1w0aum42yaptlz8alnhwikjd3jenzt9cb9wmzptgus", "dingxxxxxx");
            var msg = ding.getEncryptedMap("success");
            Console.Out.WriteLine(msg);
            //msg_signature, $data->timeStamp, $data->nonce, $data->encrypt
            var text = ding.getDecryptMsg(msg["msg_signature"], msg["timeStamp"], msg["nonce"], msg["encrypt"]);
            Console.Out.WriteLine(text);
            // "msg_signature":"c01beb7b06384cf416e04930aed794684aae98c1","encrypt":"","timeStamp":,"nonce":""
            //{"timeStamp":"1605695694141","msg_signature":"702c953056613f5c7568b79ed134a27bd2dcd8d0",
            //"encrypt":"","nonce":"WelUQl6bCqcBa2fMc6eI"}
            text = ding.getDecryptMsg("f36f4ba5337d426c7d4bca0dbcb06b3ddc1388fc", "1605695694141", "WelUQl6bCqcBa2fM", "X1VSe9cTJUMZu60d3kyLYTrBq5578ZRJtteU94wG0Q4Uk6E/wQYeJRIC0/UFW5Wkya1Ihz9oXAdLlyC9TRaqsQ==");
            Console.Out.WriteLine(text);
        }
    }

public class ApprovalInstanceModel
{

//public long Id { set; get; } = 0;
public string EventType { set; get; }
public string ProcessInstanceId { set; get; }
///

/// 企业ID
///

public string CorpId { set; get; }

public string Title { set; get; }
///

/// 审批状态类型
///

public string Type { set; get; }

///

/// 审批详情URL
///

public string Url { set; get; }
///

/// 审批结果 agree refuse 或为空
///

public string Result { set; get; }
///

/// 员工ID
///

public string StaffId { set; get; }

///

/// 审批模板code
///

public string ProcessCode { set; get; }
public long FinishTime { set; get; } = 0;
public long CreateTime { set; get; } = 0;

public DateTime CreateTimeNormal { set; get; }
public DateTime FinishTimeNormal { set; get; }

}

bpms_instance_change 类型是审批发起与结束时会触发的用来更新我们的微应用单据数据的状态，以及更新时有审批进度的URL,可以关联起来。

好了以上就是审批回调URL的接口内容了。

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原文地址：https://blog.csdn.net/u011540323/article/details/134249316