1 files changed, 48 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Tango.Web/Storage/ExtensionMethods.cs b/Software/Visual_Studio/Tango.Web/Storage/ExtensionMethods.cs
new file mode 100644
index 000000000..4acd10082
--- /dev/null
+++ b/Software/Visual_Studio/Tango.Web/Storage/ExtensionMethods.cs
@@ -0,0 +1,48 @@
+using Microsoft.WindowsAzure.Storage.Blob;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Tango.Web.Storage
+{
+    public static class ExtensionMethods
+    {
+        public static CloudBlockBlob CreateEmptyBlob(this CloudBlobContainer container, String name)
+        {
+            CloudBlockBlob emptyBlob = container.GetBlockBlobReference(name);
+            using (MemoryStream ms = new MemoryStream())
+            {
+                emptyBlob.UploadFromStream(ms);//Empty memory stream. Will create an empty blob.
+            }
+
+            return emptyBlob;
+        }
+
+        public static String GenerateReadSignature(this CloudBlockBlob blob, TimeSpan duration)
+        {
+            String signature = blob.GetSharedAccessSignature(new SharedAccessBlobPolicy()
+            {
+                SharedAccessStartTime = DateTime.UtcNow,
+                SharedAccessExpiryTime = DateTime.UtcNow.Add(duration),
+                Permissions = SharedAccessBlobPermissions.Read
+            });
+
+            return new Uri(blob.Uri + signature).ToString();
+        }
+
+        public static String GenerateWriteSignature(this CloudBlockBlob blob, TimeSpan duration)
+        {
+            String signature = blob.GetSharedAccessSignature(new SharedAccessBlobPolicy()
+            {
+                SharedAccessStartTime = DateTime.UtcNow,
+                SharedAccessExpiryTime = DateTime.UtcNow.Add(duration),
+                Permissions = SharedAccessBlobPermissions.Write
+            });
+
+            return new Uri(blob.Uri + signature).ToString();
+        }
+    }
+}