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腾讯微信已经成为当今绝大多数用户必不可少的聊天和通讯工具,腾讯也是国内最早也是最大的即时通信开发商 。腾讯云将高并发、高可靠的即时通信能力以 SDK 和 REST API的形式进行开放,推出即时通信 IM 产品,可以通过简易的方式将腾讯云提供的 IM SDK 集成进自有应用中,配合服务端 REST API 调用,即可轻松拥有微信一样强大的即时通信能力。
UserSig 是用户登录即时通信 IM 的密码,其本质是对 UserID 等信息加密后得到的密文,采用服务端计算 UserSig,可以最大限度地保障计算 UserSig 所用的密钥信息不被泄露。本文将介绍如何使用 C# 通过 TLSSigAPIv2 类计算 UserSig 的方法。
操作系统: Windows Server 2019 DataCenter
.net版本: .netFramework4.0 或以上
开发工具:VS2019 C#
TLSSigAPIv2 类提供了一系列方法,用于生成UserSig,其关键属性方法说明如下:
序号 | 项 | 类型 | 说明 |
---|---|---|---|
1 | private readonly int sdkappid | 属性 | sdk开发者id,如何获取请参照如下链接: |
2 | private readonly string key | 属性 | sdk开发者key ,如何获取请参照如下链接: |
3 | private string HMACSHA256(string identifier, long currTime, int expire, string base64UserBuf, bool userBufEnabled) | 方法 | HMAC-SHA256 算法方法。即时通信 IM 服务自2019.07.19开始启用新的签名算法,从之前的 ECDSA-SHA256 升级为 HMAC-SHA256。 2019.07.19以后创建的 SDKAppID 均会采用新的 HMAC-SHA256 算法。 |
4 | public string GenSig(string identifier, int expire = 180 * 86400) | 方法 | 生成UserSig方法。 参数:Identifier为用户 ID; 参数:expire为有效期,单位为秒。建议 UserSig 有效期最短不小于24小时,最长不超过50年。为了您的账号安全,建议将 UserSig 有效期设置为两个月。 |
实现代码如下:
- public class TLSSigAPIv2
- {
- private readonly int sdkappid;
- private readonly string key;
-
- public TLSSigAPIv2(int sdkappid, string key)
- {
- this.sdkappid = sdkappid;
- this.key = key;
- }
-
- public byte[] GetUserBuf(string account, uint authId, uint expireTime, uint privilegeBitMap, uint accountType)
- {
- int length = 1 + 2 + account.Length + 20;
- int offset = 0;
- byte[] userBuf = new byte[length];
-
- userBuf[offset++] = 0;
-
- userBuf[offset++] = (byte)((account.Length & 0xFF00) >> 8);
- userBuf[offset++] = (byte)(account.Length & 0x00FF);
-
- byte[] accountByte = System.Text.Encoding.UTF8.GetBytes(account);
- accountByte.CopyTo(userBuf, offset);
- offset += account.Length;
-
- userBuf[offset++] = (byte)((sdkappid & 0xFF000000) >> 24);
- userBuf[offset++] = (byte)((sdkappid & 0x00FF0000) >> 16);
- userBuf[offset++] = (byte)((sdkappid & 0x0000FF00) >> 8);
- userBuf[offset++] = (byte)(sdkappid & 0x000000FF);
-
- userBuf[offset++] = (byte)((authId & 0xFF000000) >> 24);
- userBuf[offset++] = (byte)((authId & 0x00FF0000) >> 16);
- userBuf[offset++] = (byte)((authId & 0x0000FF00) >> 8);
- userBuf[offset++] = (byte)(authId & 0x000000FF);
-
- userBuf[offset++] = (byte)((expireTime & 0xFF000000) >> 24);
- userBuf[offset++] = (byte)((expireTime & 0x00FF0000) >> 16);
- userBuf[offset++] = (byte)((expireTime & 0x0000FF00) >> 8);
- userBuf[offset++] = (byte)(expireTime & 0x000000FF);
-
- userBuf[offset++] = (byte)((privilegeBitMap & 0xFF000000) >> 24);
- userBuf[offset++] = (byte)((privilegeBitMap & 0x00FF0000) >> 16);
- userBuf[offset++] = (byte)((privilegeBitMap & 0x0000FF00) >> 8);
- userBuf[offset++] = (byte)(privilegeBitMap & 0x000000FF);
-
- userBuf[offset++] = (byte)((accountType & 0xFF000000) >> 24);
- userBuf[offset++] = (byte)((accountType & 0x00FF0000) >> 16);
- userBuf[offset++] = (byte)((accountType & 0x0000FF00) >> 8);
- userBuf[offset++] = (byte)(accountType & 0x000000FF);
-
- return userBuf;
- }
-
- private static byte[] CompressBytes(byte[] sourceByte)
- {
- MemoryStream inputStream = new MemoryStream(sourceByte);
- Stream outStream = CompressStream(inputStream);
- byte[] outPutByteArray = new byte[outStream.Length];
- outStream.Position = 0;
- outStream.Read(outPutByteArray, 0, outPutByteArray.Length);
- return outPutByteArray;
- }
-
- private static Stream CompressStream(Stream sourceStream)
- {
- MemoryStream streamOut = new MemoryStream();
- ZOutputStream streamZOut = new ZOutputStream(streamOut, zlibConst.Z_DEFAULT_COMPRESSION);
- CopyStream(sourceStream, streamZOut);
- streamZOut.finish();
- return streamOut;
- }
-
- public static void CopyStream(System.IO.Stream input, System.IO.Stream output)
- {
- byte[] buffer = new byte[2000];
- int len;
- while ((len = input.Read(buffer, 0, 2000)) > 0)
- {
- output.Write(buffer, 0, len);
- }
- output.Flush();
- }
-
- private string HMACSHA256(string identifier, long currTime, int expire, string base64UserBuf, bool userBufEnabled)
- {
- string rawContentToBeSigned = "TLS.identifier:" + identifier + "\n"
- + "TLS.sdkappid:" + sdkappid + "\n"
- + "TLS.time:" + currTime + "\n"
- + "TLS.expire:" + expire + "\n";
- if (true == userBufEnabled)
- {
- rawContentToBeSigned += "TLS.userbuf:" + base64UserBuf + "\n";
- }
- using (HMACSHA256 hmac = new HMACSHA256())
- {
- UTF8Encoding encoding = new UTF8Encoding();
- Byte[] textBytes = encoding.GetBytes(rawContentToBeSigned);
- Byte[] keyBytes = encoding.GetBytes(key);
- Byte[] hashBytes;
- using (HMACSHA256 hash = new HMACSHA256(keyBytes))
- hashBytes = hash.ComputeHash(textBytes);
- return Convert.ToBase64String(hashBytes);
- }
- }
-
- private string GenSig(string identifier, int expire, byte[] userbuf, bool userBufEnabled)
- {
- DateTime epoch = new DateTime(1970, 1, 1); // unix 时间戳
- Int64 currTime = (Int64)(DateTime.UtcNow - epoch).TotalMilliseconds / 1000;
-
- string base64UserBuf;
- string jsonData;
- if (true == userBufEnabled)
- {
- base64UserBuf = Convert.ToBase64String(userbuf);
- string base64sig = HMACSHA256(identifier, currTime, expire, base64UserBuf, userBufEnabled);
- // 没有引入 json 库,所以这里手动进行组装,
- // 这里如果用户 identifier 中出现 json 元字符将会出错
- jsonData = String.Format("{{"
- + "\"TLS.ver\":" + "\"2.0\","
- + "\"TLS.identifier\":" + "\"{0}\","
- + "\"TLS.sdkappid\":" + "{1},"
- + "\"TLS.expire\":" + "{2},"
- + "\"TLS.time\":" + "{3},"
- + "\"TLS.sig\":" + "\"{4}\","
- + "\"TLS.userbuf\":" + "\"{5}\""
- + "}}", identifier, sdkappid, expire, currTime, base64sig, base64UserBuf);
- }
- else
- {
- // 没有引入 json 库,所以这里手动进行组装
- string base64sig = HMACSHA256(identifier, currTime, expire, "", false);
- jsonData = String.Format("{{"
- + "\"TLS.ver\":" + "\"2.0\","
- + "\"TLS.identifier\":" + "\"{0}\","
- + "\"TLS.sdkappid\":" + "{1},"
- + "\"TLS.expire\":" + "{2},"
- + "\"TLS.time\":" + "{3},"
- + "\"TLS.sig\":" + "\"{4}\""
- + "}}", identifier, sdkappid, expire, currTime, base64sig);
- }
-
- byte[] buffer = Encoding.UTF8.GetBytes(jsonData);
- return Convert.ToBase64String(CompressBytes(buffer))
- .Replace('+', '*').Replace('/', '-').Replace('=', '_');
- }
-
- public string GenSig(string identifier, int expire = 180 * 86400)
- {
- return GenSig(identifier, expire, null, false);
- }
-
- public string GenSigWithUserBuf(string identifier, int expire, byte[] userBuf)
- {
- return GenSig(identifier, expire, userBuf, true);
- }
- }
服务端的调用引用代码如下:
- string SDKAppId="申请的SDKAppID";
- string SDKAppIdSecret="申请的SDKAppIdSecret";
- string AppAdminId="IM平台超级管理员UserID";
-
- TLSSigAPIv2 sig = new TLSSigAPIv2(int.Parse(SDKAppId),SDKAppIdSecret);
- string _sig = sig.GenSig(AppAdminId);
后续我们将介绍如何通过UserSig 来实现 IM 服务端 REST API,REST API 是即时通信 IM 提供给 App 后台的 HTTP 管理接口,是一组原始的且管理功能强大的API。
本文代码仅供您参考使用,感谢您的阅读,希望本文能够对您有所帮助。
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