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#region Disclaimer / License
// Copyright (C) 2015, The Duplicati Team
// http://www.duplicati.com, info@duplicati.com
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using Duplicati.Library.Interface;
using System.Collections.Specialized;
using System.Web;
using System.Linq;
namespace Duplicati.Library.DynamicLoader
{
/// <summary>
/// Loads all backends dynamically and exposes a list of those
/// </summary>
public class BackendLoader
{
/// <summary>
/// Implementation overrides specific to backends
/// </summary>
private class BackendLoaderSub : DynamicLoader<IBackend>
{
/// <summary>
/// Returns the protocol key
/// </summary>
/// <param name="item">The item to load the key for</param>
/// <returns>The protocol key</returns>
protected override string GetInterfaceKey(IBackend item)
{
return item.ProtocolKey;
}
/// <summary>
/// Returns the subfolders searched for backends
/// </summary>
protected override string[] Subfolders
{
get { return new string[] {"backends"}; }
}
/// <summary>
/// Instanciates a specific backend, given the url and options
/// </summary>
/// <param name="url">The url to create the instance for</param>
/// <param name="options">The options to pass to the instance constructor</param>
/// <returns>The instanciated backend or null if the url is not supported</returns>
public IBackend GetBackend(string url, Dictionary<string, string> options)
{
var uri = new Utility.Uri(url);
LoadInterfaces();
var newOpts = new Dictionary<string, string>(options);
foreach (var key in uri.QueryParameters.AllKeys)
newOpts[key] = uri.QueryParameters[key];
lock (m_lock)
{
try
{
if (m_interfaces.ContainsKey(uri.Scheme))
return (IBackend)Activator.CreateInstance(m_interfaces[uri.Scheme].GetType(), url, newOpts);
else if (uri.Scheme.EndsWith("s"))
{
var tmpscheme = uri.Scheme.Substring(0, uri.Scheme.Length - 1);
if (m_interfaces.ContainsKey(tmpscheme))
{
var commands = m_interfaces[tmpscheme].SupportedCommands;
if (commands != null && (commands.Where(x =>
x.Name.Equals("use-ssl", StringComparison.InvariantCultureIgnoreCase) ||
(x.Aliases != null && x.Aliases.Where(y => y.Equals("use-ssl", StringComparison.InvariantCultureIgnoreCase)).Any())
).Any()))
{
newOpts["use-ssl"] = "true";
return (IBackend)Activator.CreateInstance(m_interfaces[tmpscheme].GetType(), url, newOpts);
}
}
}
}
catch (System.Reflection.TargetInvocationException tex)
{
// Unwrap exceptions for nicer display
if (tex.InnerException != null)
throw tex.InnerException;
throw;
}
return null;
}
}
/// <summary>
/// Gets the supported commands for a certain url
/// </summary>
/// <param name="url">The url to find commands for</param>
/// <returns>The supported commands or null if the url scheme was not supported</returns>
public IList<ICommandLineArgument> GetSupportedCommands(string url)
{
var uri = new Utility.Uri(url);
LoadInterfaces();
lock (m_lock)
{
IBackend b;
if (m_interfaces.TryGetValue(uri.Scheme, out b) && b != null)
return b.SupportedCommands;
else if (uri.Scheme.EndsWith("s"))
{
var tmpscheme = uri.Scheme.Substring(0, uri.Scheme.Length - 1);
if (m_interfaces.ContainsKey(tmpscheme))
return m_interfaces[tmpscheme].SupportedCommands;
}
return null;
}
}
}
/// <summary>
/// The static instance used to access backend information
/// </summary>
private static BackendLoaderSub _backendLoader = new BackendLoaderSub();
#region Public static API
/// <summary>
/// Gets a list of loaded backends, the instances can be used to extract interface information, not used to interact with the backend.
/// </summary>
public static IBackend[] Backends { get { return _backendLoader.Interfaces; } }
/// <summary>
/// Gets a list of keys supported
/// </summary>
public static string[] Keys { get { return _backendLoader.Keys; } }
/// <summary>
/// Gets the supported commands for a given backend
/// </summary>
/// <param name="url">The url to find the commands for</param>
/// <returns>The supported commands or null if the url is not supported</returns>
public static IList<ICommandLineArgument> GetSupportedCommands(string url)
{
if (string.IsNullOrEmpty(url))
throw new ArgumentNullException("url");
return _backendLoader.GetSupportedCommands(url);
}
/// <summary>
/// Instanciates a specific backend, given the url and options
/// </summary>
/// <param name="url">The url to create the instance for</param>
/// <param name="options">The options to pass to the instance constructor</param>
/// <returns>The instanciated backend or null if the url is not supported</returns>
public static IBackend GetBackend(string url, Dictionary<string, string> options)
{
return _backendLoader.GetBackend(url, options);
}
#endregion
}
}
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