added azure storage implementation for new IAssetStore methods.

src/Squidex.Infrastructure.Azure/Storage/AzureBlobAssetStore.cs

@@ -9,6 +9,7 @@
 using System;
 using System.IO;
 using System.Threading.Tasks;
+using Microsoft.WindowsAzure.Storage;
 using Microsoft.WindowsAzure.Storage.Blob;
 using Squidex.Infrastructure.Assets;
 
@@ -31,6 +32,33 @@ namespace Squidex.Infrastructure.Azure.Storage
             this.containerName = containerName;
         }
 
+        public async Task CopyTemporaryAsync(string name, string id, long version, string suffix)
+        {
+            var blobName = GetObjectName(id, version, suffix);
+            var blobSource = blobContainer.GetBlockBlobReference(name);
+            var targetTemporaryBlob = blobContainer.GetBlobReference(blobName);
+
+            try
+            {
+                await targetTemporaryBlob.StartCopyAsync(blobSource.Uri);
+                while (targetTemporaryBlob.CopyState.Status == CopyStatus.Pending)
+                {
+                    await Task.Delay(500);
+                    await targetTemporaryBlob.FetchAttributesAsync();
+                }
+
+                if (targetTemporaryBlob.CopyState.Status != CopyStatus.Success)
+                    throw new Exception($"Copy of temporary file failed: {targetTemporaryBlob.CopyState.Status}");
+            }
+            catch (StorageException ex)
+            {
+                var requestInformation = ex.RequestInformation;
+                if (requestInformation.HttpStatusCode == 404)
+                    throw new AssetNotFoundException($"Asset {name} not found.", ex);
+                throw;
+            }
+        }
+
         public async Task DownloadAsync(string id, long version, string suffix, Stream stream)
         {
             var blobName = GetObjectName(id, version, suffix);
@@ -42,6 +70,12 @@ namespace Squidex.Infrastructure.Azure.Storage
             await blob.DownloadToStreamAsync(stream);
         }
 
+        public async Task UploadTemporaryAsync(string name, Stream stream)
+        {
+            var blob = blobContainer.GetBlockBlobReference(name);
+            await blob.UploadFromStreamAsync(stream);
+        }
+
         public async Task UploadAsync(string id, long version, string suffix, Stream stream)
         {
             var blobName = GetObjectName(id, version, suffix);
@@ -54,6 +88,12 @@ namespace Squidex.Infrastructure.Azure.Storage
             await blob.SetMetadataAsync();
         }
 
+        public async Task DeleteTemporaryAsync(string name)
+        {
+            var blob = blobContainer.GetBlockBlobReference(name);
+            await blob.DeleteIfExistsAsync();
+        }
+
         public void Connect()
         {
             try