As a workaround for not currently being able to add attachments as streams (see restsharp/RestSharp#70 ) - the attachment is added as a byte array.

Author: jforsell

src/SymphonyOSS.RestApiClient/Api/AgentApi/AttachmentsApi.cs

@@ -15,7 +15,10 @@
 // specific language governing permissions and limitations
 // under the License.
 
+using System;
 using System.IO;
+using RestSharp;
+using RestSharp.Extensions;
 
 namespace SymphonyOSS.RestApiClient.Api.AgentApi
 {
@@ -56,11 +59,14 @@ public AttachmentsApi(IAuthTokens authTokens, Configuration configuration, IApiE
         /// be used on a message in that stream.
         /// </summary>
         /// <param name="sid">Stream ID.</param>
-        /// <param name="file">The file to upload as an attachment.</param>
+        /// <param name="file">The path of the file to upload as an attachment.</param>
         /// <returns>Attachment info.</returns>
-        public AttachmentInfo UploadAttachment(string sid, Stream file)
+        public AttachmentInfo UploadAttachment(string sid, string file)
         {
-            return _apiExecutor.Execute(_attachmentsApi.V1StreamSidAttachmentCreatePost, sid, _authTokens.SessionToken, _authTokens.KeyManagerToken, file);
+            using (var stream = File.OpenRead(file))
+            {
+                return _apiExecutor.Execute(UploadAttachment, sid, Path.GetFileName(file), stream);
+            }
         }
 
         /// <summary>
@@ -74,5 +80,17 @@ public byte[] DownloadAttachment(string sid, string messageId, string fileId)
         {
             return _apiExecutor.Execute(_attachmentsApi.V1StreamSidAttachmentGet, sid, fileId, messageId, _authTokens.SessionToken, _authTokens.KeyManagerToken);
         }
+
+        private AttachmentInfo UploadAttachment(string sid, string filename, Stream file)
+        {
+            var request = new RestRequest("v1/stream/" + sid + "/attachment/create", Method.POST);
+            request.AddHeader("sessionToken", _authTokens.SessionToken);
+            request.AddHeader("keyManagerToken", _authTokens.KeyManagerToken);
+            request.AddFile("file", file.ReadAsBytes(), filename, "application/octet-stream");
+
+            var apiClient = _attachmentsApi.Configuration.ApiClient;
+            var response = apiClient.RestClient.Execute(request);
+            return (AttachmentInfo)apiClient.Deserialize(response, typeof(AttachmentInfo));
+        }
     }
 }

test/SymphonyOSS.RestApiClient.Tests/AttachmentsApiTest.cs

@@ -55,12 +55,20 @@ public void EnsureDownloadAttachment_uses_retry_strategy()
         }
 
         [Fact]
-        public void EnsureUploadAttachment_uses_retry_strategy()
+        public void EnsureUploadAttachment_throws_FileNotFoundException()
         {
             const string sid = "sid";
-            var file = new Mock<Stream>().Object;
-            _attachmentsApi.UploadAttachment(sid, file);
-            _apiExecutorMock.Verify(obj => obj.Execute(It.IsAny<Func<string, string, string, Stream, AttachmentInfo>>(), sid, "sessionToken", "keyManagerToken", file));
+            var file = "does_not_exist.png";
+            Exception exception = null;
+            try
+            {
+                _attachmentsApi.UploadAttachment(sid, file);
+            }
+            catch (Exception e)
+            {
+                exception = e;
+            }
+            Assert.IsType<FileNotFoundException>(exception);
         }
     }
 }