308 lines
10 KiB
C#
308 lines
10 KiB
C#
// Copyright (C) 2024, The Duplicati Team
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// https://duplicati.com, hello@duplicati.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using CG.Web.MegaApiClient;
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using Duplicati.Library.Common.IO;
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using Duplicati.Library.Interface;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using OtpNet;
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namespace Duplicati.Library.Backend.Mega
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{
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// ReSharper disable once UnusedMember.Global
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// This class is instantiated dynamically in the BackendLoader.
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public class MegaBackend: IBackend, IStreamingBackend
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{
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private readonly string m_username = null;
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private readonly string m_password = null;
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private readonly string m_twoFactorKey = null;
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private Dictionary<string, List<INode>> m_filecache;
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private INode m_currentFolder = null;
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private readonly string m_prefix = null;
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private MegaApiClient m_client;
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public MegaBackend()
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{
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}
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private MegaApiClient Client
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{
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get
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{
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if (m_client == null)
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{
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var cl = new MegaApiClient();
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if (m_twoFactorKey == null)
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cl.Login(m_username, m_password);
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else
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{
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var totp = new Totp(Base32Encoding.ToBytes(m_twoFactorKey)).ComputeTotp();
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cl.Login(m_username, m_password, totp);
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}
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m_client = cl;
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}
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return m_client;
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}
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}
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public MegaBackend(string url, Dictionary<string, string> options)
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{
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var uri = new Utility.Uri(url);
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if (options.ContainsKey("auth-username"))
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m_username = options["auth-username"];
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if (options.ContainsKey("auth-password"))
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m_password = options["auth-password"];
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if (options.ContainsKey("auth-two-factor-key"))
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m_twoFactorKey = options["auth-two-factor-key"];
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if (!string.IsNullOrEmpty(uri.Username))
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m_username = uri.Username;
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if (!string.IsNullOrEmpty(uri.Password))
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m_password = uri.Password;
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if (string.IsNullOrEmpty(m_username))
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throw new UserInformationException(Strings.MegaBackend.NoUsernameError, "MegaNoUsername");
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if (string.IsNullOrEmpty(m_password))
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throw new UserInformationException(Strings.MegaBackend.NoPasswordError, "MegaNoPassword");
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m_prefix = uri.HostAndPath ?? "";
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}
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private void GetCurrentFolder(bool autocreate = false)
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{
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var parts = m_prefix.Split(new string[] { "/" }, StringSplitOptions.RemoveEmptyEntries);
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var nodes = Client.GetNodes();
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INode parent = nodes.First(x => x.Type == NodeType.Root);
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foreach(var n in parts)
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{
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var item = nodes.FirstOrDefault(x => x.Name == n && x.Type == NodeType.Directory && x.ParentId == parent.Id);
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if (item == null)
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{
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if (!autocreate)
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throw new FolderMissingException();
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item = Client.CreateFolder(n, parent);
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}
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parent = item;
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}
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m_currentFolder = parent;
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ResetFileCache(nodes);
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}
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private INode CurrentFolder
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{
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get
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{
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if (m_currentFolder == null)
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GetCurrentFolder(false);
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return m_currentFolder;
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}
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}
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private INode GetFileNode(string name)
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{
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if (m_filecache != null && m_filecache.ContainsKey(name))
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return m_filecache[name].OrderByDescending(x => x.ModificationDate).First();
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ResetFileCache();
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if (m_filecache != null && m_filecache.ContainsKey(name))
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return m_filecache[name].OrderByDescending(x => x.ModificationDate).First();
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throw new FileMissingException();
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}
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private void ResetFileCache(IEnumerable<INode> list = null)
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{
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if (m_currentFolder == null)
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{
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GetCurrentFolder(false);
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}
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else
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{
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m_filecache =
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(list ?? Client.GetNodes()).Where(x => x.Type == NodeType.File && x.ParentId == CurrentFolder.Id)
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.GroupBy(x => x.Name, x => x, (k, g) => new KeyValuePair<string, List<INode>>(k, g.ToList()))
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.ToDictionary(x => x.Key, x => x.Value);
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}
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}
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#region IStreamingBackend implementation
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public async Task PutAsync(string remotename, System.IO.Stream stream, CancellationToken cancelToken)
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{
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try
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{
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if (m_filecache == null)
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ResetFileCache();
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var el = await Client.UploadAsync(stream, remotename, CurrentFolder, new Progress(), null, cancelToken);
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if (m_filecache.ContainsKey(remotename))
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Delete(remotename);
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m_filecache[remotename] = new List<INode>();
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m_filecache[remotename].Add(el);
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}
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catch
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{
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m_filecache = null;
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throw;
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}
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}
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public void Get(string remotename, System.IO.Stream stream)
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{
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using(var s = Client.Download(GetFileNode(remotename)))
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Library.Utility.Utility.CopyStream(s, stream);
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}
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#endregion
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#region IBackend implementation
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public IEnumerable<IFileEntry> List()
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{
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if (m_filecache == null)
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ResetFileCache();
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return
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from n in m_filecache.Values
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let item = n.OrderByDescending(x => x.ModificationDate).First()
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select new FileEntry(item.Name, item.Size, item.ModificationDate ?? new DateTime(0), item.ModificationDate ?? new DateTime(0));
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}
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public async Task PutAsync(string remotename, string filename, CancellationToken cancelToken)
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{
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using (System.IO.FileStream fs = System.IO.File.OpenRead(filename))
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await PutAsync(remotename, fs, cancelToken);
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}
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public void Get(string remotename, string filename)
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{
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using (System.IO.FileStream fs = System.IO.File.Create(filename))
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Get(remotename, fs);
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}
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public void Delete(string remotename)
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{
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try
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{
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if (m_filecache == null || !m_filecache.ContainsKey(remotename))
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ResetFileCache();
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if (!m_filecache.ContainsKey(remotename))
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throw new FileMissingException();
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foreach(var n in m_filecache[remotename])
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Client.Delete(n, false);
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m_filecache.Remove(remotename);
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}
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catch
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{
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m_filecache = null;
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throw;
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}
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}
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public void Test()
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{
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this.TestList();
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}
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public void CreateFolder()
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{
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GetCurrentFolder(true);
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}
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public string DisplayName
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{
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get
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{
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return Strings.MegaBackend.DisplayName;
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}
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}
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public string ProtocolKey
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{
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get
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{
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return "mega";
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}
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}
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public IList<ICommandLineArgument> SupportedCommands
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{
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get
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{
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return new List<ICommandLineArgument>(new ICommandLineArgument[] {
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new CommandLineArgument("auth-password", CommandLineArgument.ArgumentType.Password, Strings.MegaBackend.AuthPasswordDescriptionShort, Strings.MegaBackend.AuthPasswordDescriptionLong),
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new CommandLineArgument("auth-username", CommandLineArgument.ArgumentType.String, Strings.MegaBackend.AuthUsernameDescriptionShort, Strings.MegaBackend.AuthUsernameDescriptionLong),
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new CommandLineArgument("auth-two-factor-key", CommandLineArgument.ArgumentType.Password, Strings.MegaBackend.AuthTwoFactorKeyDescriptionShort, Strings.MegaBackend.AuthTwoFactorKeyDescriptionLong),
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});
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}
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}
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public string Description
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{
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get
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{
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return Strings.MegaBackend.Description;
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}
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}
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public string[] DNSName
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{
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get { return null; }
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}
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#endregion
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#region IDisposable implementation
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public void Dispose()
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{
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}
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#endregion
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private class Progress : IProgress<double>
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{
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public void Report(double value)
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{
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// No implementation as we have already wrapped the stream in our own progress reporting stream
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}
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}
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}
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}
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