Preserve content type of objects during metadata update operations (fixes #192)

Author: sharwell

src/corelib/Providers/Rackspace/CloudFilesProvider.cs

@@ -808,7 +808,11 @@ public void UpdateObjectMetadata(string container, string objectName, Dictionary
 
             var urlPath = new Uri(string.Format("{0}/{1}/{2}", GetServiceEndpointCloudFiles(identity, region, useInternalUrl), _encodeDecodeProvider.UrlEncode(container), _encodeDecodeProvider.UrlEncode(objectName)));
 
-            ExecuteRESTRequest(identity, urlPath, HttpMethod.POST, headers: headers);
+            RequestSettings settings = BuildDefaultRequestSettings();
+            // make sure the content type is not changed by the metadata operation
+            settings.ContentType = null;
+
+            ExecuteRESTRequest(identity, urlPath, HttpMethod.POST, headers: headers, settings: settings);
         }
 
         /// <inheritdoc />

src/testing/integration/Providers/Rackspace/UserObjectStorageTests.cs

@@ -864,19 +864,23 @@ public void TestUpdateObjectMetaData()
             string containerName = TestContainerPrefix + Path.GetRandomFileName();
             string objectName = Path.GetRandomFileName();
             string objectData = "";
+            string contentType = "text/plain-jane";
 
             ObjectStore result = provider.CreateContainer(containerName);
             Assert.AreEqual(ObjectStore.ContainerCreated, result);
 
             Stream stream = new MemoryStream(Encoding.UTF8.GetBytes(objectData));
-            provider.CreateObject(containerName, stream, objectName);
+            provider.CreateObject(containerName, stream, objectName, contentType);
+            Assert.AreEqual(contentType, GetObjectContentType(provider, containerName, objectName));
+
             Dictionary<string, string> metadata = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
             {
                 { "Key1", "Value 1" },
                 { "Key2", "Value ²" },
             };
 
             provider.UpdateObjectMetadata(containerName, objectName, new Dictionary<string, string>(metadata, StringComparer.OrdinalIgnoreCase));
+            Assert.AreEqual(contentType, GetObjectContentType(provider, containerName, objectName));
 
             Dictionary<string, string> actualMetadata = provider.GetObjectMetaData(containerName, objectName);
             Console.WriteLine("Object Metadata");
@@ -891,6 +895,7 @@ public void TestUpdateObjectMetaData()
                 { "Key2", "Value 2" }
             };
             provider.UpdateObjectMetadata(containerName, objectName, new Dictionary<string, string>(updatedMetadata, StringComparer.OrdinalIgnoreCase));
+            Assert.AreEqual(contentType, GetObjectContentType(provider, containerName, objectName));
 
             actualMetadata = provider.GetObjectMetaData(containerName, objectName);
             Console.WriteLine("Object Metadata");