Azure Blob Storage FileSystemProvider for Umbraco

AzureFileSystemProvider.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using Umbraco.Core.IO;

namespace MyNamespace
{
	public class AzureFileSystemProvider : IFileSystem
	{
		private readonly CloudBlobContainer _container;

		private readonly string _storageUrl;
		private readonly string _containerName;

		public AzureFileSystemProvider(
			string storageUrl, 
			string containerName,
			string connectionStringName)
		{
			_containerName = containerName;
			_storageUrl = storageUrl;

			CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
				ConfigurationManager.ConnectionStrings[connectionStringName].ConnectionString);

			CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

			_container = blobClient.GetContainerReference(_containerName);

			if (!_container.Exists())
			{
				_container.Create(BlobContainerPublicAccessType.Blob);
			}
		}

		public IEnumerable<string> GetDirectories(string path)
		{
			return _container.ListBlobs(path)
				.Where(b => b is CloudBlobDirectory)
				.Select(b => b.Uri.ToString());
		}

		public void DeleteDirectory(string path)
		{
			
		}

		public void DeleteDirectory(string path, bool recursive)
		{
			
		}

		public bool DirectoryExists(string path)
		{
			return _container.GetBlockBlobReference(path).Exists();
		}

		public void AddFile(string path, Stream stream)
		{
			AddFile(path, stream, false);
		}

		public void AddFile(string path, Stream stream, bool overrideIfExists)
		{
			CloudBlockBlob blockBlob = _container.GetBlockBlobReference(path);

			blockBlob.UploadFromStream(stream);
		}

		public IEnumerable<string> GetFiles(string path)
		{
			return _container.ListBlobs(path)
				.Where(b => b is CloudBlockBlob)
				.Select(b => b.Uri.ToString());
		}

		public IEnumerable<string> GetFiles(string path, string filter)
		{
			return _container.ListBlobs(path)
				.Where(b => b is CloudBlockBlob)
				.Select(b => b.Uri.ToString());
		}

		public Stream OpenFile(string path)
		{
			CloudBlockBlob blockBlob = _container.GetBlockBlobReference(path);

			Stream stream = new MemoryStream();
			blockBlob.DownloadToStream(stream);

			return stream;
		}

		public void DeleteFile(string path)
		{
			string azureUrl = path
				.Replace(Path.DirectorySeparatorChar, '/')
				.TrimStart('/');

			CloudBlockBlob blockBlob = _container.GetBlockBlobReference(azureUrl);

			blockBlob.Delete();
		}

		public bool FileExists(string path)
		{
			return _container.GetBlockBlobReference(path).Exists();
		}

		public string GetRelativePath(string fullPathOrUrl)
		{
			string path = fullPathOrUrl
				.Replace(
					string.Format("{0}/{1}",
						_storageUrl,
						_containerName),
					string.Empty)
				.Replace('/', Path.DirectorySeparatorChar);

			return path;
		}

		public string GetFullPath(string path)
		{
			string fullPath = string.Format("{0}",
				path.TrimStart(Path.DirectorySeparatorChar));

			return fullPath;
		}

		public string GetUrl(string path)
		{
			string url = string.Format("{0}{1}{2}{1}{3}",
				_storageUrl,
				Path.DirectorySeparatorChar,
				_containerName,
				path
				)
				.Replace(Path.DirectorySeparatorChar, '/');

			return url;
		}

		public DateTimeOffset GetLastModified(string path)
		{
			return DateTimeOffset.UtcNow;
		}

		public DateTimeOffset GetCreated(string path)
		{
			return DateTimeOffset.UtcNow;
		}
	}
}

FileSystemProviders.config

<?xml version="1.0"?>
<FileSystemProviders>
	<Provider alias="media" type="MyNamespace.AzureFileSystemProvider, MyAssembly">
		<Parameters>
			<add key="storageUrl" value="http://mystorageaccount.blob.core.windows.net" />
			<add key="containerName" value="umbraco-media" />
			<add key="connectionStringName" value="AzureStorageConnectionString" />
		</Parameters>
	</Provider>
</FileSystemProviders>

Web.config

<connectionStrings>
  <add name="AzureStorageConnectionString" connectionString="DefaultEndpointsProtocol=https;AccountName=mystorageaccount;AccountKey=MyStorageAccountKey" />	
</connectionStrings>