钉钉企业应用C#开发笔记之一(免登)

关于钉钉

钉钉是阿里推出的企业移动OA平台,本身提供了丰富的通用应用,同时其强大的后台API接入能力让企业接入自主开发的应用成为可能,可以让开发者实现几乎任何需要的功能。

近期因为工作需要研究了一下钉钉的接入,发现其接入文档、SDK都是基于java编写的,而我们的企业网站使用Asp.Net MVC(C#)开发,所以接入只能从头自己做SDK。

接入主要包括免登、获取数据、修改数据等接口。

免登流程

首先需要理解一下钉钉的免登流程,借用官方文档的图片:

钉钉企业应用C#开发笔记之一(免登)

是不是很熟悉?是的,基本是按照OAUTH的原理来的,版本嘛,里面有计算签名的部分,我觉得应该是OAUTH1.0。

有的读者会问,那第一步是不是应该跳转到第三方认证页面啊。我觉得“魔法”就藏在用来打开页面的钉钉内置浏览器里,在dd.config()这一步里,“魔法”就生效了。

其实简单来说,主要分为五步:

  1. 在你的Web服务器端调用api,传入CorpId和CorpSecret,获取accessToken,即访问令牌。
  2. 在服务器端调用api,传入accessToken,获取JsApiTicket,即JsApi的访问许可(门票)。
  3. 按照既定规则,在后台由JsApiTicket、NonceStr、Timestamp、本页面Url生成字符串,计算SHA1消息摘要,即签名Signature。
  4. 将AgentId、CorpId、Timestamp、NonceStr、Signature等参数传递到前台,在前台调用api,得到authCode,即授权码。
  5. 根据授权码,在前台或后台调用api,获得userId,进而再根据userId,调用api获取用户详细信息。

PS:为什么需要在后台完成一些api的调用呢?应该是因为js跨域调用的问题,我具体没有深究。

实践方法

理解了上述步骤,我对登陆过程的实现也大致有了一个设想,既然免登需要前后端一起来完成,那就添加一个专门的登陆页面,将登陆过程都在里面实现,将登陆结果写入到Session,并重定向回业务页面,即算完成。图示如下:

钉钉企业应用C#开发笔记之一(免登)

其中每个api的调用方式,在官方文档中都有说明。同时,我在阿里云开发者论坛找到了网友提供的SDK,有兴趣可以下载:钉钉非官方.Net SDK

另外,GitHub上还有官方的JQuery版免登开发Demo,可以参考:GitHub JQuery免登

我参考的是.Net SDK,将其中的代码,提取出了我所需要的部分,做了简化处理。基本原理就是每次调用API都是发起HttpRequest,将结果做JSON反序列化。

核心代码如下:

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using DDApi.Model; namespace DDApi
{
public static class DDHelper
{
public static string GetAccessToken(string corpId, string corpSecret)
{
string url = string.Format("https://oapi.dingtalk.com/gettoken?corpid={0}&corpsecret={1}", corpId, corpSecret);
try
{
string response = HttpRequestHelper.Get(url);
AccessTokenModel oat = Newtonsoft.Json.JsonConvert.DeserializeObject<AccessTokenModel>(response); if (oat != null)
{
if (oat.errcode == )
{
return oat.access_token;
}
}
}
catch (Exception ex)
{
throw;
}
return string.Empty;
} /* https://oapi.dingtalk.com/get_jsapi_ticket?access_token=79721ed2fc46317197e27d9bedec0425
*
* errmsg "ok"
* ticket "KJWkoWOZ0BMYaQzWFDF5AUclJOHgO6WvzmNNJTswpAMPh3S2Z98PaaJkRzkjsmT5HaYFfNkMdg8lFkvxSy9X01"
* expires_in 7200
* errcode 0
*/
public static string GetJsApiTicket(string accessToken)
{
string url = string.Format("https://oapi.dingtalk.com/get_jsapi_ticket?access_token={0}", accessToken);
try
{
string response = HttpRequestHelper.Get(url);
JsApiTicketModel model = Newtonsoft.Json.JsonConvert.DeserializeObject<JsApiTicketModel>(response); if (model != null)
{
if (model.errcode == )
{
return model.ticket;
}
}
}
catch (Exception ex)
{
throw;
}
return string.Empty;
} public static long GetTimeStamp()
{
TimeSpan ts = DateTime.UtcNow - new DateTime(, , , , , , );
return Convert.ToInt64(ts.TotalSeconds);
} public static string GetUserId(string accessToken, string code)
{
string url = string.Format("https://oapi.dingtalk.com/user/getuserinfo?access_token={0}&code={1}", accessToken, code);
try
{
string response = HttpRequestHelper.Get(url);
GetUserInfoModel model = Newtonsoft.Json.JsonConvert.DeserializeObject<GetUserInfoModel>(response); if (model != null)
{
if (model.errcode == )
{
return model.userid;
}
else
{
throw new Exception(model.errmsg);
}
}
}
catch (Exception ex)
{
throw;
}
return string.Empty;
} public static string GetUserDetailJson(string accessToken, string userId)
{
string url = string.Format("https://oapi.dingtalk.com/user/get?access_token={0}&userid={1}", accessToken, userId);
try
{
string response = HttpRequestHelper.Get(url);
return response;
}
catch (Exception ex)
{
throw;
}
return null;
} public static UserDetailInfo GetUserDetail(string accessToken, string userId)
{
string url = string.Format("https://oapi.dingtalk.com/user/get?access_token={0}&userid={1}", accessToken, userId);
try
{
string response = HttpRequestHelper.Get(url);
UserDetailInfo model = Newtonsoft.Json.JsonConvert.DeserializeObject<UserDetailInfo>(response); if (model != null)
{
if (model.errcode == )
{
return model;
}
}
}
catch (Exception ex)
{
throw;
}
return null;
} public static List<DepartmentInfo> GetDepartmentList(string accessToken, int parentId = )
{
string url = string.Format("https://oapi.dingtalk.com/department/list?access_token={0}", accessToken);
if (parentId >= )
{
url += string.Format("&id={0}", parentId);
}
try
{
string response = HttpRequestHelper.Get(url);
GetDepartmentListModel model = Newtonsoft.Json.JsonConvert.DeserializeObject<GetDepartmentListModel>(response); if (model != null)
{
if (model.errcode == )
{
return model.department.ToList();
}
}
}
catch (Exception ex)
{
throw;
}
return null;
}
}
}
 using System.IO;
using System.Net; namespace DDApi
{
public class HttpRequestHelper
{
public static string Get(string url)
{
WebRequest request = HttpWebRequest.Create(url);
WebResponse response = request.GetResponse();
Stream stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream);
string content = reader.ReadToEnd();
return content;
} public static string Post(string url)
{
WebRequest request = HttpWebRequest.Create(url);
request.Method = "POST";
WebResponse response = request.GetResponse();
Stream stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream);
string content = reader.ReadToEnd();
return content;
}
}
}

HttpRequestHelper

其中的Model,就不再一一贴出来了,大家可以根据官方文档自己建立,这里只举一个例子,即GetAccessToken的返回结果:

    public class AccessTokenModel
{
public string access_token { get; set; } public int errcode { get; set; } public string errmsg { get; set; }
}

我创建了一个类DDApiService,将上述方法做了封装:

using DDApi.Model;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Security.Cryptography;
using System.Text; namespace DDApi
{
/// <summary>
///
/// </summary>
public class DDApiService
{
public static readonly DDApiService Instance = new DDApiService(); public string CorpId { get; private set; }
public string CorpSecret { get; private set; }
public string AgentId { get; private set; } private DDApiService()
{
CorpId = ConfigurationManager.AppSettings["corpId"];
CorpSecret = ConfigurationManager.AppSettings["corpSecret"];
AgentId = ConfigurationManager.AppSettings["agentId"];
} /// <summary>
/// 获取AccessToken
/// 开发者在调用开放平台接口前需要通过CorpID和CorpSecret获取AccessToken。
/// </summary>
/// <returns></returns>
public string GetAccessToken()
{
return DDHelper.GetAccessToken(CorpId, CorpSecret);
} public string GetJsApiTicket(string accessToken)
{
return DDHelper.GetJsApiTicket(accessToken);
} public string GetUserId(string accessToken, string code)
{
return DDHelper.GetUserId(accessToken, code);
} public UserDetailInfo GetUserDetail(string accessToken, string userId)
{
return DDHelper.GetUserDetail(accessToken, userId);
} public string GetUserDetailJson(string accessToken, string userId)
{
return DDHelper.GetUserDetailJson(accessToken, userId);
} public UserDetailInfo GetUserDetailFromJson(string jsonString)
{
UserDetailInfo model = Newtonsoft.Json.JsonConvert.DeserializeObject<UserDetailInfo>(jsonString); if (model != null)
{
if (model.errcode == )
{
return model;
}
}
return null;
} public string GetSign(string ticket, string nonceStr, long timeStamp, string url)
{
String plain = string.Format("jsapi_ticket={0}&noncestr={1}&timestamp={2}&url={3}", ticket, nonceStr, timeStamp, url); try
{
byte[] bytes = Encoding.UTF8.GetBytes(plain);
byte[] digest = SHA1.Create().ComputeHash(bytes);
string digestBytesString = BitConverter.ToString(digest).Replace("-", "");
return digestBytesString.ToLower();
}
catch (Exception e)
{
throw;
}
} public List<DepartmentInfo> GetDepartmentList(string accessToken, int parentId = )
{
return DDHelper.GetDepartmentList(accessToken, parentId);
}
}
}

DDApiService

以上是底层核心部分。登录页面的实现在控制器DDController中,代码如下:

using DDApi;
using DDApi.Model;
using System;
using System.Web.Mvc; namespace AppointmentWebApp.Controllers
{
public class DDController : Controller
{
//
// GET: /DD/
public ActionResult GetUserInfo(string accessToken, string code, bool setCurrentUser = true)
{
try
{
string userId = DDApiService.Instance.GetUserId(accessToken, code);
string jsonString = DDApiService.Instance.GetUserDetailJson(accessToken, userId);
UserDetailInfo userInfo = DDApiService.Instance.GetUserDetailFromJson(jsonString);
if (setCurrentUser)
{
Session["AccessToken"] = accessToken;
Session["CurrentUser"] = userInfo;
}
return Content(jsonString);
}
catch (Exception ex)
{
return Content(string.Format("{{'errcode': -1, 'errmsg':'{0}'}}", ex.Message));
}
} public ActionResult Login()
{
BeginDDAutoLogin();
return View();
} private void BeginDDAutoLogin()
{
string nonceStr = "helloDD";//todo:随机
ViewBag.NonceStr = nonceStr;
string accessToken = DDApiService.Instance.GetAccessToken();
ViewBag.AccessToken = accessToken;
string ticket = DDApiService.Instance.GetJsApiTicket(accessToken);
long timeStamp = DDHelper.GetTimeStamp();
string url = Request.Url.ToString();
string signature = DDApiService.Instance.GetSign(ticket, nonceStr, timeStamp, url); ViewBag.JsApiTicket = ticket;
ViewBag.Signature = signature;
ViewBag.NonceStr = nonceStr;
ViewBag.TimeStamp = timeStamp;
ViewBag.CorpId = DDApiService.Instance.CorpId;
ViewBag.CorpSecret = DDApiService.Instance.CorpSecret;
ViewBag.AgentId = DDApiService.Instance.AgentId;
}
}
}

DDController

视图View的代码:

@{
ViewBag.Title = "Login";
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
<title>@ViewBag.Title</title>
</head>
<body>
<h2 id="notice">正在登录...</h2>
<script src="//cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript" src="http://g.alicdn.com/dingding/open-develop/1.5.1/dingtalk.js"></script>
<script type="text/javascript">
var _config = [];
_config.agentId = "@ViewBag.AgentId";
_config.corpId = "@ViewBag.CorpId";
_config.timeStamp = "@ViewBag.TimeStamp";
_config.nonceStr = "@ViewBag.NonceStr";
_config.signature = "@ViewBag.Signature"; dd.config({
agentId: _config.agentId,
corpId: _config.corpId,
timeStamp: _config.timeStamp,
nonceStr: _config.nonceStr,
signature: _config.signature,
jsApiList: ['runtime.info', 'biz.contact.choose',
'device.notification.confirm', 'device.notification.alert',
'device.notification.prompt', 'biz.ding.post',
'biz.util.openLink']
}); dd.ready(function () {
dd.runtime.info({
onSuccess: function (info) {
logger.e('runtime info: ' + JSON.stringify(info));
},
onFail: function (err) {
logger.e('fail: ' + JSON.stringify(err));
}
}); dd.runtime.permission.requestAuthCode({
corpId: _config.corpId,
onSuccess: function (info) {//成功获得code值,code值在info中
//alert('authcode: ' + info.code);
//alert('token: @ViewBag.AccessToken');
/*
*$.ajax的是用来使得当前js页面和后台服务器交互的方法
*参数url:是需要交互的后台服务器处理代码,这里的userinfo对应WEB-INF -> classes文件中的UserInfoServlet处理程序
*参数type:指定和后台交互的方法,因为后台servlet代码中处理Get和post的doGet和doPost
*原本需要传输的参数可以用data来存储的,格式为data:{"code":info.code,"corpid":_config.corpid}
*其中success方法和error方法是回调函数,分别表示成功交互后和交互失败情况下处理的方法
*/
$.ajax({
url: '@Url.Action("GetUserInfo", "DD")?code=' + info.code + '&accessToken=@ViewBag.AccessToken',//userinfo为本企业应用服务器后台处理程序
type: 'GET',
/*
*ajax中的success为请求得到相应后的回调函数,function(response,status,xhr)
*response为响应的数据,status为请求状态,xhr包含XMLHttpRequest对象
*/
success: function (data, status, xhr) {
alert(data);
var info = JSON.parse(data);
if (info.errcode != 0) {
alert(data);
} else {
//alert("当前用户:" + info.name);
$('#notice').text("欢迎您:" + info.name + "。浏览器正在自动跳转...");
location.href = "@Url.Action("Index", "Home")";
}
},
error: function (xhr, errorType, error) {
logger.e("尝试获取用户信息失败:" + info.code);
alert(errorType + ', ' + error);
}
}); },
onFail: function (err) {//获得code值失败
alert('fail: ' + JSON.stringify(err));
}
});
});
dd.error(function (err) {
alert('dd error: ' + JSON.stringify(err));
});
</script>
</body>
</html>

Login.cshtml

其中nonstr理论上最好应该每次都随机,留待读者去完成吧:-)

钉钉免登就是这样,只要弄懂了就会觉得其实不难,还顺便理解了OAUTH。

后续改进

这个流程没有考虑到AccessToken、JsApiTicket的有效期时间(2小时),因为整个过程就在一个页面中都完成了。如果想要进一步扩展,多次调用api的话,需要考虑到上述有效期。

如果为了图简便每都去获取AccessToken也是可以的,但是会增加服务器负担,而且api的调用频率是有限制的(1500次/s好像),所以应当采取措施控制。例如可以将AccessToken、JsApiTicket存放在this.HttpContext.Application["accessToken"]中,每次判断有效期是否过期,如果过期就调用api重新申请一个。

以上就是这样,感谢阅读。


20170710编辑,更新mvc免登流程图片,修正一处错误。

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