Add azure blob storage support

samples/TestFtpServer/Configuration/FileSystemAzureBlobStorageOptions.cs

@@ -0,0 +1,27 @@
+// <copyright file="FileSystemAmazonS3Options.cs" company="Fubar Development Junker">
+// Copyright (c) Fubar Development Junker. All rights reserved.
+// </copyright>
+
+namespace TestFtpServer.Configuration
+{
+    /// <summary>
+    /// Options for the Azure blob storage file system.
+    /// </summary>
+    public class FileSystemAzureBlobStorageOptions
+    {
+        /// <summary>
+        /// Gets or sets the root name.
+        /// </summary>
+        public string? RootPath { get; set; }
+
+        /// <summary>
+        /// Gets or sets the container name.
+        /// </summary>
+        public string? ContainerName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the connection string.
+        /// </summary>
+        public string? ConnectionString { get; set; }
+    }
+}

samples/TestFtpServer/Configuration/FileSystemType.cs

@@ -38,5 +38,10 @@ public enum FileSystemType
         /// Amazon S3 file system.
         /// </summary>
         AmazonS3,
+
+        /// <summary>
+        /// Azure Blob Storage file system.
+        /// </summary>
+        AzureBlobStorage,
     }
 }

samples/TestFtpServer/Configuration/FtpOptions.cs

@@ -58,6 +58,7 @@ public string Backend
                 switch (BackendType)
                 {
                     case FileSystemType.AmazonS3: return "amazon-s3";
+                    case FileSystemType.AzureBlobStorage: return "azureblobstorage";
                     case FileSystemType.InMemory: return "in-memory";
                     case FileSystemType.SystemIO: return "system-io";
                     case FileSystemType.Unix: return "unix";
@@ -77,6 +78,9 @@ public string Backend
                     case "amazon-s3":
                         BackendType = FileSystemType.AmazonS3;
                         break;
+                    case "azureblobstorage":
+                        BackendType = FileSystemType.AzureBlobStorage;
+                        break;
                     case "inMemory":
                     case "in-memory":
                         BackendType = FileSystemType.InMemory;
@@ -98,7 +102,7 @@ public string Backend
                         break;
                     default:
                         throw new ArgumentOutOfRangeException(
-                            $"Value must be one of \"in-memory\", \"system-io\", \"unix\", \"google-drive:user\", \"google-drive:service\", \"amazon-s3\" but was , \"{value}\"");
+                            $"Value must be one of \"in-memory\", \"system-io\", \"unix\", \"google-drive:user\", \"google-drive:service\", \"amazon-s3\", \"azureblobstorage\" but was , \"{value}\"");
                 }
             }
         }
@@ -170,6 +174,11 @@ public string Layout
         /// </summary>
         public FileSystemAmazonS3Options AmazonS3 { get; set; } = new FileSystemAmazonS3Options();
 
+        /// <summary>
+        /// Gets or sets azure blob storage system options.
+        /// </summary>
+        public FileSystemAzureBlobStorageOptions AzureBlobStorage { get; set; } = new FileSystemAzureBlobStorageOptions();
+
         internal FileSystemLayoutType LayoutType
         {
             get => _layout ?? FileSystemLayoutType.SingleRoot;

samples/TestFtpServer/ServiceCollectionExtensions.cs

@@ -13,6 +13,7 @@
 using FubarDev.FtpServer.CommandExtensions;
 using FubarDev.FtpServer.Commands;
 using FubarDev.FtpServer.FileSystem;
+using FubarDev.FtpServer.FileSystem.AzureBlobStorage;
 using FubarDev.FtpServer.FileSystem.DotNet;
 using FubarDev.FtpServer.FileSystem.GoogleDrive;
 using FubarDev.FtpServer.FileSystem.InMemory;
@@ -93,7 +94,12 @@ public static IServiceCollection AddFtpServices(
                         opt.BucketRegion = options.AmazonS3.BucketRegion;
                         opt.AwsAccessKeyId = options.AmazonS3.AwsAccessKeyId;
                         opt.AwsSecretAccessKey = options.AmazonS3.AwsSecretAccessKey;
-                    });
+                    })
+               .Configure<AzureBlobStorageFileSystemOptions>(opt =>
+               {
+                   opt.ContainerName = options.AzureBlobStorage.ContainerName;
+                   opt.ConnectionString = options.AzureBlobStorage.ConnectionString;
+               });
 #if NETCOREAPP
             services
                .Configure<PamMembershipProviderOptions>(
@@ -184,6 +190,10 @@ public static IServiceCollection AddFtpServices(
                     services = services
                        .AddFtpServer(sb => sb.ConfigureAuthentication(options).UseS3FileSystem().ConfigureServer(options));
                     break;
+                case FileSystemType.AzureBlobStorage:
+                    services = services
+                       .AddFtpServer(sb => sb.ConfigureAuthentication(options).UseAzureBlobStorageFileSystem().ConfigureServer(options));
+                    break;
                 default:
                     throw new NotSupportedException(
                         $"Backend of type {options.Backend} cannot be run from configuration file options.");

samples/TestFtpServer/TestFtpServer.csproj

@@ -22,6 +22,7 @@
     <PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\..\src\FubarDev.FtpServer.FileSystem.AzureBlobStorage\FubarDev.FtpServer.FileSystem.AzureBlobStorage.csproj" />
     <ProjectReference Include="..\..\src\FubarDev.FtpServer.FileSystem.DotNet\FubarDev.FtpServer.FileSystem.DotNet.csproj" />
     <ProjectReference Include="..\..\src\FubarDev.FtpServer.FileSystem.GoogleDrive\FubarDev.FtpServer.FileSystem.GoogleDrive.csproj" />
     <ProjectReference Include="..\..\src\FubarDev.FtpServer.FileSystem.InMemory\FubarDev.FtpServer.FileSystem.InMemory.csproj" />

samples/TestFtpServer/appsettings.json

@@ -159,5 +159,16 @@
     "awsAccessKeyId": null,
     /* The AWS secret key */
     "awsSecretAccessKey": null
+  },
+
+  /* Use Azure Blob Storage as backend */
+  "azureblobstorage": {
+    /* Name of the root path */
+    "rootPath":  null,
+    /* Name of the container */
+    "containerName": null,
+    /* Connection string to the blob storage */
+    "connectionString": null
   }
 }
+

src/FubarDev.FtpServer.FileSystem.AzureBlobStorage/AzureBlobStorageDirectoryEntry.cs

@@ -0,0 +1,33 @@
+// <copyright file="S3DirectoryEntry.cs" company="Fubar Development Junker">
+// Copyright (c) Fubar Development Junker. All rights reserved.
+// </copyright>
+
+using System.IO;
+
+
+namespace FubarDev.FtpServer.FileSystem.AzureBlobStorage
+{
+    /// <summary>
+    /// The virtual directory entry for blob objects.
+    /// </summary>
+    internal class AzureBlobStorageDirectoryEntry : AzureBlobStorageFileSystemEntry, IUnixDirectoryEntry
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AzureBlobStorageDirectoryEntry"/> class.
+        /// </summary>
+        /// <param name="key">The path/prefix of the child entries.</param>
+        /// <param name="isRoot">Determines if this is the root directory.</param>
+        public AzureBlobStorageDirectoryEntry(string key, bool isRoot = false)
+            : base(key.EndsWith("/") || isRoot ? key : key + "/", Path.GetFileName(key.TrimEnd('/')))
+        { 
+            IsRoot = isRoot;
+        }
+
+        /// <inheritdoc />
+        public bool IsRoot { get; }
+
+
+        /// <inheritdoc />
+        public bool IsDeletable => !IsRoot;
+    }
+}

src/FubarDev.FtpServer.FileSystem.AzureBlobStorage/AzureBlobStorageFileEntry.cs

@@ -0,0 +1,28 @@
+// <copyright file="S3FileEntry.cs" company="Fubar Development Junker">
+// Copyright (c) Fubar Development Junker. All rights reserved.
+// </copyright>
+
+using System.IO;
+
+namespace FubarDev.FtpServer.FileSystem.AzureBlobStorage
+{
+    /// <summary>
+    /// A file entry for an azure blob storage object.
+    /// </summary>
+    internal class AzureBlobStorageFileEntry : AzureBlobStorageFileSystemEntry, IUnixFileEntry
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AzureBlobStorageFileEntry"/> class.
+        /// </summary>
+        /// <param name="key">The blob object key.</param>
+        /// <param name="size">The object size.</param>
+        public AzureBlobStorageFileEntry(string key, long size)
+            : base(key, Path.GetFileName(key))
+        {
+            Size = size;
+        }
+
+        /// <inheritdoc />
+        public long Size { get; }
+    }
+}