钉钉审批接口支持三方通过接口传附件

     之前钉钉是不支持直接接口进行传附件的，只能通过前端获取参数然后点击传输；新接口通过代码封装获取数据流，上传附件然后提交附件，把返回的数据包解析适合于三方的发起格式数据，上传即可，剩下就是通过接口传审批带附件内容的数据。

主要使用的接口:

•  获取钉盘空间信息接口

  POST /v1.0/workflow/processInstances/spaces/infos/query HTTP/1.1
  Host:api.dingtalk.com
  x-acs-dingtalk-access-token:String
  Content-Type:application/json

  {
  "userId" : "String",
  "agentId" : Long
  }

• 获取文件上传信息接口

  POST /v1.0/storage/spaces/{spaceId}/files/uploadInfos/query?unionId=String HTTP/1.1
  Host:api.dingtalk.com
  x-acs-dingtalk-access-token:String
  Content-Type:application/json

  {
  "protocol" : "String",
  "multipart" : Boolean,
  "option" : {
  "storageDriver" : "String",
  "preCheckParam" : {
  "md5" : "String",
  "size" : Long,
  "parentId" : "String",
  "name" : "String"
  },
  "preferRegion" : "String",
  "preferIntranet" : Boolean
  }
  }

• 使用OSS的header加签方式上传文件
  public static string HttpRequest(string url, string filePath, Dictionary<string, string> headers) {

  
  

      FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

      BinaryReader reader = new BinaryReader(fileStream);

      reader.BaseStream.Seek(0, SeekOrigin.Begin);

      byte[] datas = reader.ReadBytes((int)reader.BaseStream.Length);

      HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

      request.Method = "PUT";

      request.Timeout = 150000;

      foreach (var header in headers) {

          request.Headers.Add($"{header.Key}", $"{header.Value}");

      }

      Stream requestStream = null;

      string responseStr = null;

      try {

          if (datas != null) {

              request.ContentLength = datas.Length;

              requestStream = request.GetRequestStream();

              requestStream.Write(datas, 0, datas.Length);

              requestStream.Close();

          } else {

              request.ContentLength = 0;

          }

          HttpWebResponse response = request.GetResponse() as HttpWebResponse;

          responseStr = response.Headers.GetValues("x-oss-request-id")[0];

      } catch (Exception ex) {

          Console.WriteLine("error");

      } finally {

          request = null;

          requestStream = null;

      }

      return responseStr;

  }
• 提交文件

• POST /v1.0/storage/spaces/{spaceId}/files/commit?unionId=String HTTP/1.1
  Host:api.dingtalk.com
  x-acs-dingtalk-access-token:String
  Content-Type:application/json

  {
  "uploadKey" : "String",
  "name" : "String",
  "parentId" : "String",
  "option" : {
  "size" : Long,
  "conflictStrategy" : "String",
  "appProperties" : [ {
  "name" : "String",
  "value" : "String",
  "visibility" : "String"
  } ]
  }
  }