qbittorrent: client plugin based heavily on uTorrent

supports a minimum qBittorrent version of 3.2.4, and uses labels for
v3.3.0 and later

Signed-off-by: Casey Bodley <cbodley@gmail.com>

src/NzbDrone.Core.Test/Download/DownloadClientTests/QBittorrentTests/QBittorrentFixture.cs

@@ -0,0 +1,297 @@
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using FluentAssertions;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Common.Http;
+using NzbDrone.Core.MediaFiles.TorrentInfo;
+using NzbDrone.Core.Download;
+using NzbDrone.Core.Download.Clients.QBittorrent;
+using NzbDrone.Test.Common;
+
+namespace NzbDrone.Core.Test.Download.DownloadClientTests.QBittorrentTests
+{
+    [TestFixture]
+    public class QBittorrentFixture : DownloadClientFixtureBase<QBittorrent>
+    {
+        [SetUp]
+        public void Setup()
+        {
+            Subject.Definition = new DownloadClientDefinition();
+            Subject.Definition.Settings = new QBittorrentSettings
+                                          {
+                                              Host = "127.0.0.1",
+                                              Port = 2222,
+                                              Username = "admin",
+                                              Password = "pass",
+                                              TvCategory = "tv"
+                                          };
+
+            Mocker.GetMock<ITorrentFileInfoReader>()
+                  .Setup(s => s.GetHashFromTorrentFile(It.IsAny<Byte[]>()))
+                  .Returns("CBC2F069FE8BB2F544EAE707D75BCD3DE9DCF951");
+
+            Mocker.GetMock<IHttpClient>()
+                  .Setup(s => s.Get(It.IsAny<HttpRequest>()))
+                  .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), new Byte[0]));
+        }
+
+        protected void GivenRedirectToMagnet()
+        {
+            var httpHeader = new HttpHeader();
+            httpHeader["Location"] = "magnet:?xt=urn:btih:ZPBPA2P6ROZPKRHK44D5OW6NHXU5Z6KR&tr=udp";
+
+            Mocker.GetMock<IHttpClient>()
+                  .Setup(s => s.Get(It.IsAny<HttpRequest>()))
+                  .Returns<HttpRequest>(r => new HttpResponse(r, httpHeader, new Byte[0], System.Net.HttpStatusCode.SeeOther));
+        }
+
+        protected void GivenRedirectToTorrent()
+        {
+            var httpHeader = new HttpHeader();
+            httpHeader["Location"] = "http://test.sonarr.tv/not-a-real-torrent.torrent";
+
+            Mocker.GetMock<IHttpClient>()
+                  .Setup(s => s.Get(It.Is<HttpRequest>(h => h.Url.AbsoluteUri == _downloadUrl)))
+                  .Returns<HttpRequest>(r => new HttpResponse(r, httpHeader, new Byte[0], System.Net.HttpStatusCode.Found));
+        }
+
+        protected void GivenFailedDownload()
+        {
+            Mocker.GetMock<IQBittorrentProxy>()
+                .Setup(s => s.AddTorrentFromUrl(It.IsAny<string>(), It.IsAny<QBittorrentSettings>()))
+                .Throws<InvalidOperationException>();
+        }
+
+        protected void GivenSuccessfulDownload()
+        {
+            Mocker.GetMock<IQBittorrentProxy>()
+                .Setup(s => s.AddTorrentFromUrl(It.IsAny<string>(), It.IsAny<QBittorrentSettings>()))
+                .Callback(() =>
+                {
+                    var torrent = new QBittorrentTorrent
+                    {
+                        Hash = "HASH",
+                        Name = _title,
+                        Size = 1000,
+                        Progress = 1.0,
+                        Eta = 8640000,
+                        State = "queuedUP",
+                        Label = "",
+                        SavePath = ""
+                    };
+                    GivenTorrents(new List<QBittorrentTorrent> { torrent });
+                });
+        }
+
+        protected virtual void GivenTorrents(List<QBittorrentTorrent> torrents)
+        {
+            if (torrents == null)
+                torrents = new List<QBittorrentTorrent>();
+
+            Mocker.GetMock<IQBittorrentProxy>()
+                .Setup(s => s.GetTorrents(It.IsAny<QBittorrentSettings>()))
+                .Returns(torrents);
+        }
+
+        [Test]
+        public void error_item_should_have_required_properties()
+        {
+            var torrent = new QBittorrentTorrent
+            {
+                Hash = "HASH",
+                Name = _title,
+                Size = 1000,
+                Progress = 0.7,
+                Eta = 8640000,
+                State = "error",
+                Label = "",
+                SavePath = ""
+            };
+            GivenTorrents(new List<QBittorrentTorrent> { torrent });
+
+            var item = Subject.GetItems().Single();
+            VerifyFailed(item);
+        }
+
+        [Test]
+        public void paused_item_should_have_required_properties()
+        {
+            var torrent = new QBittorrentTorrent
+            {
+                Hash = "HASH",
+                Name = _title,
+                Size = 1000,
+                Progress = 0.7,
+                Eta = 8640000,
+                State = "pausedDL",
+                Label = "",
+                SavePath = ""
+            };
+            GivenTorrents(new List<QBittorrentTorrent> { torrent });
+
+            var item = Subject.GetItems().Single();
+            VerifyPaused(item);
+            item.RemainingTime.Should().NotBe(TimeSpan.Zero);
+        }
+
+        [TestCase("pausedUP")]
+        [TestCase("queuedUP")]
+        [TestCase("uploading")]
+        [TestCase("stalledUP")]
+        [TestCase("checkingUP")]
+        public void completed_item_should_have_required_properties(string state)
+        {
+            var torrent = new QBittorrentTorrent
+            {
+                Hash = "HASH",
+                Name = _title,
+                Size = 1000,
+                Progress = 1.0,
+                Eta = 8640000,
+                State = state,
+                Label = "",
+                SavePath = ""
+            };
+            GivenTorrents(new List<QBittorrentTorrent> { torrent });
+
+            var item = Subject.GetItems().Single();
+            VerifyCompleted(item);
+            item.RemainingTime.Should().Be(TimeSpan.Zero);
+        }
+
+        [TestCase("queuedDL")]
+        [TestCase("checkingDL")]
+        public void queued_item_should_have_required_properties(string state)
+        {
+            var torrent = new QBittorrentTorrent
+            {
+                Hash = "HASH",
+                Name = _title,
+                Size = 1000,
+                Progress = 0.7,
+                Eta = 8640000,
+                State = state,
+                Label = "",
+                SavePath = ""
+            };
+            GivenTorrents(new List<QBittorrentTorrent> { torrent });
+
+            var item = Subject.GetItems().Single();
+            VerifyQueued(item);
+            item.RemainingTime.Should().NotBe(TimeSpan.Zero);
+        }
+
+        [Test]
+        public void downloading_item_should_have_required_properties()
+        {
+            var torrent = new QBittorrentTorrent
+            {
+                Hash = "HASH",
+                Name = _title,
+                Size = 1000,
+                Progress = 0.7,
+                Eta = 60,
+                State = "downloading",
+                Label = "",
+                SavePath = ""
+            };
+            GivenTorrents(new List<QBittorrentTorrent> { torrent });
+
+            var item = Subject.GetItems().Single();
+            VerifyDownloading(item);
+            item.RemainingTime.Should().NotBe(TimeSpan.Zero);
+        }
+
+        [Test]
+        public void stalledDL_item_should_have_required_properties()
+        {
+            var torrent = new QBittorrentTorrent
+            {
+                Hash = "HASH",
+                Name = _title,
+                Size = 1000,
+                Progress = 0.7,
+                Eta = 8640000,
+                State = "stalledDL",
+                Label = "",
+                SavePath = ""
+            };
+            GivenTorrents(new List<QBittorrentTorrent> { torrent });
+
+            var item = Subject.GetItems().Single();
+            VerifyWarning(item);
+            item.RemainingTime.Should().NotBe(TimeSpan.Zero);
+        }
+
+        [Test]
+        public void Download_should_return_unique_id()
+        {
+            GivenSuccessfulDownload();
+
+            var remoteEpisode = CreateRemoteEpisode();
+
+            var id = Subject.Download(remoteEpisode);
+
+            id.Should().NotBeNullOrEmpty();
+        }
+
+        [TestCase("magnet:?xt=urn:btih:ZPBPA2P6ROZPKRHK44D5OW6NHXU5Z6KR&tr=udp", "CBC2F069FE8BB2F544EAE707D75BCD3DE9DCF951")]
+        public void Download_should_get_hash_from_magnet_url(string magnetUrl, string expectedHash)
+        {
+            GivenSuccessfulDownload();
+
+            var remoteEpisode = CreateRemoteEpisode();
+            remoteEpisode.Release.DownloadUrl = magnetUrl;
+
+            var id = Subject.Download(remoteEpisode);
+
+            id.Should().Be(expectedHash);
+        }
+
+        [Test]
+        public void should_return_status_with_outputdirs()
+        {
+            var configItems = new Dictionary<string, Object>();
+
+            configItems.Add("save_path", @"C:\Downloads\Finished\QBittorrent".AsOsAgnostic());
+
+            Mocker.GetMock<IQBittorrentProxy>()
+                .Setup(v => v.GetConfig(It.IsAny<QBittorrentSettings>()))
+                .Returns(configItems);
+
+            var result = Subject.GetStatus();
+
+            result.IsLocalhost.Should().BeTrue();
+            result.OutputRootFolders.Should().NotBeNull();
+            result.OutputRootFolders.First().Should().Be(@"C:\Downloads\Finished\QBittorrent".AsOsAgnostic());
+        }
+
+        [Test]
+        public void Download_should_handle_http_redirect_to_magnet()
+        {
+            GivenRedirectToMagnet();
+            GivenSuccessfulDownload();
+
+            var remoteEpisode = CreateRemoteEpisode();
+
+            var id = Subject.Download(remoteEpisode);
+
+            id.Should().NotBeNullOrEmpty();
+        }
+
+        [Test]
+        public void Download_should_handle_http_redirect_to_torrent()
+        {
+            GivenRedirectToTorrent();
+            GivenSuccessfulDownload();
+
+            var remoteEpisode = CreateRemoteEpisode();
+
+            var id = Subject.Download(remoteEpisode);
+
+            id.Should().NotBeNullOrEmpty();
+        }
+    }
+}

src/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj

@@ -163,6 +163,7 @@
     <Compile Include="Download\DownloadClientTests\NzbgetTests\NzbgetFixture.cs" />
     <Compile Include="Download\DownloadClientTests\PneumaticProviderFixture.cs" />
     <Compile Include="Download\DownloadClientTests\RTorrentTests\RTorrentFixture.cs" />
+    <Compile Include="Download\DownloadClientTests\QBittorrentTests\QBittorrentFixture.cs" />
     <Compile Include="Download\DownloadClientTests\SabnzbdTests\SabnzbdFixture.cs" />
     <Compile Include="Download\DownloadClientTests\TransmissionTests\TransmissionFixture.cs" />
     <Compile Include="Download\DownloadClientTests\UTorrentTests\UTorrentFixture.cs" />

src/NzbDrone.Core/Download/Clients/qBittorrent/DigestAuthenticator.cs

@@ -0,0 +1,22 @@
+using RestSharp;
+using System.Net;
+
+namespace NzbDrone.Core.Download.Clients.QBittorrent
+{
+    public class DigestAuthenticator : IAuthenticator
+    {
+        private readonly string _user;
+        private readonly string _pass;
+
+        public DigestAuthenticator(string user, string pass)
+        {
+            _user = user;
+            _pass = pass;
+        }
+
+        public void Authenticate(IRestClient client, IRestRequest request)
+        {
+            request.Credentials = new NetworkCredential(_user, _pass);
+        }
+    }
+}

src/NzbDrone.Core/Download/Clients/qBittorrent/QBittorrent.cs

@@ -0,0 +1,261 @@
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using NzbDrone.Common.Disk;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Common.Http;
+using NzbDrone.Core.Configuration;
+using NzbDrone.Core.MediaFiles.TorrentInfo;
+using NLog;
+using NzbDrone.Core.Validation;
+using FluentValidation.Results;
+using System.Net;
+using NzbDrone.Core.Parser.Model;
+using NzbDrone.Core.RemotePathMappings;
+
+namespace NzbDrone.Core.Download.Clients.QBittorrent
+{
+    public class QBittorrent : TorrentClientBase<QBittorrentSettings>
+    {
+        private readonly IQBittorrentProxy _proxy;
+
+        public QBittorrent(IQBittorrentProxy proxy,
+                           ITorrentFileInfoReader torrentFileInfoReader,
+                           IHttpClient httpClient,
+                           IConfigService configService,
+                           IDiskProvider diskProvider,
+                           IRemotePathMappingService remotePathMappingService,
+                           Logger logger)
+            : base(torrentFileInfoReader, httpClient, configService, diskProvider, remotePathMappingService, logger)
+        {
+            _proxy = proxy;
+        }
+
+        protected override string AddFromMagnetLink(RemoteEpisode remoteEpisode, string hash, string magnetLink)
+        {
+            _proxy.AddTorrentFromUrl(magnetLink, Settings);
+
+            if (Settings.TvCategory.IsNotNullOrWhiteSpace())
+            {
+                _proxy.SetTorrentLabel(hash.ToLower(), Settings.TvCategory, Settings);
+            }
+
+            var isRecentEpisode = remoteEpisode.IsRecentEpisode();
+
+            if (isRecentEpisode && Settings.RecentTvPriority == (int)QBittorrentPriority.First ||
+                !isRecentEpisode && Settings.OlderTvPriority == (int)QBittorrentPriority.First)
+            {
+                _proxy.MoveTorrentToTopInQueue(hash.ToLower(), Settings);
+            }
+
+            return hash;
+        }
+
+        protected override string AddFromTorrentFile(RemoteEpisode remoteEpisode, string hash, string filename, Byte[] fileContent)
+        {
+            _proxy.AddTorrentFromFile(filename, fileContent, Settings);
+
+            if (Settings.TvCategory.IsNotNullOrWhiteSpace())
+            {
+                _proxy.SetTorrentLabel(hash.ToLower(), Settings.TvCategory, Settings);
+            }
+
+            var isRecentEpisode = remoteEpisode.IsRecentEpisode();
+
+            if (isRecentEpisode && Settings.RecentTvPriority == (int)QBittorrentPriority.First ||
+                !isRecentEpisode && Settings.OlderTvPriority == (int)QBittorrentPriority.First)
+            {
+                _proxy.MoveTorrentToTopInQueue(hash.ToLower(), Settings);
+            }
+
+            return hash;
+        }
+
+        public override string Name
+        {
+            get
+            {
+                return "qBittorrent";
+            }
+        }
+
+        public override IEnumerable<DownloadClientItem> GetItems()
+        {
+            List<QBittorrentTorrent> torrents;
+
+            try
+            {
+                torrents = _proxy.GetTorrents(Settings);
+            }
+            catch (DownloadClientException ex)
+            {
+                _logger.ErrorException(ex.Message, ex);
+                return Enumerable.Empty<DownloadClientItem>();
+            }
+
+            var queueItems = new List<DownloadClientItem>();
+
+            foreach (var torrent in torrents)
+            {
+                var item = new DownloadClientItem();
+                item.DownloadId = torrent.Hash.ToUpper();
+                item.Category = torrent.Label;
+                item.Title = torrent.Name;
+                item.TotalSize = torrent.Size;
+                item.DownloadClient = Definition.Name;
+                item.RemainingSize = (long)(torrent.Size * (1.0 - torrent.Progress));
+                item.RemainingTime = TimeSpan.FromSeconds(torrent.Eta);
+
+                item.OutputPath = _remotePathMappingService.RemapRemoteToLocal(Settings.Host, new OsPath(torrent.SavePath));
+
+                if (!item.OutputPath.IsEmpty && item.OutputPath.FileName != torrent.Name)
+                {
+                    item.OutputPath += torrent.Name;
+                }
+
+                switch (torrent.State)
+                {
+                    case "error": // some error occurred, applies to paused torrents
+                        item.Status = DownloadItemStatus.Failed;
+                        item.Message = "QBittorrent is reporting an error";
+                        break;
+
+                    case "pausedDL": // torrent is paused and has NOT finished downloading
+                        item.Status = DownloadItemStatus.Paused;
+                        break;
+
+                    case "queuedDL": // queuing is enabled and torrent is queued for download
+                    case "checkingDL": // same as checkingUP, but torrent has NOT finished downloading
+                        item.Status = DownloadItemStatus.Queued;
+                        break;
+
+                    case "pausedUP": // torrent is paused and has finished downloading
+                    case "uploading": // torrent is being seeded and data is being transfered
+                    case "stalledUP": // torrent is being seeded, but no connection were made
+                    case "queuedUP": // queuing is enabled and torrent is queued for upload
+                    case "checkingUP": // torrent has finished downloading and is being checked
+                        item.Status = DownloadItemStatus.Completed;
+                        item.RemainingTime = TimeSpan.Zero; // qBittorrent sends eta=8640000 for completed torrents
+                        break;
+
+                    case "stalledDL": // torrent is being downloaded, but no connection were made
+                        item.Status = DownloadItemStatus.Warning;
+                        item.Message = "The download is stalled with no connections";
+                        break;
+
+                    case "downloading": // torrent is being downloaded and data is being transfered
+                    default: // new status in API? default to downloading
+                        item.Status = DownloadItemStatus.Downloading;
+                        break;
+                }
+
+                queueItems.Add(item);
+            }
+
+            return queueItems;
+        }
+
+        public override void RemoveItem(string hash, bool deleteData)
+        {
+            _proxy.RemoveTorrent(hash.ToLower(), deleteData, Settings);
+        }
+
+        public override DownloadClientStatus GetStatus()
+        {
+            var config = _proxy.GetConfig(Settings);
+
+            var destDir = new OsPath((string)config.GetValueOrDefault("save_path"));
+
+            return new DownloadClientStatus
+            {
+                IsLocalhost = Settings.Host == "127.0.0.1" || Settings.Host == "localhost",
+                OutputRootFolders = new List<OsPath> { _remotePathMappingService.RemapRemoteToLocal(Settings.Host, destDir) }
+            };
+        }
+
+        protected override void Test(List<ValidationFailure> failures)
+        {
+            failures.AddIfNotNull(TestConnection());
+            if (failures.Any()) return;
+            failures.AddIfNotNull(TestGetTorrents());
+        }
+
+        private ValidationFailure TestConnection()
+        {
+            try
+            {
+                var version = _proxy.GetVersion(Settings);
+                if (version < 5)
+                {
+                    // API version 5 introduced the "save_path" property in /query/torrents
+                    return new NzbDroneValidationFailure("Host", "Unsupported client version")
+                    {
+                        DetailedDescription = "Please upgrade to qBittorrent version 3.2.4 or higher."
+                    };
+                }
+                else if (version < 6)
+                {
+                    // API version 6 introduced support for labels
+                    if (Settings.TvCategory.IsNotNullOrWhiteSpace())
+                    {
+                        return new NzbDroneValidationFailure("Category", "Category is not supported")
+                        {
+                            DetailedDescription = "Labels are not supported until qBittorrent version 3.3.0. Please upgrade or try again with an empty Category."
+                        };
+                    }
+                }
+                else if (Settings.TvCategory.IsNullOrWhiteSpace())
+                {
+                    // warn if labels are supported, but category is not provided
+                    return new NzbDroneValidationFailure("TvCategory", "Category is recommended")
+                    {
+                        IsWarning = true,
+                        DetailedDescription = "Sonarr will not attempt to import completed downloads without a category."
+                    };
+                }
+            }
+            catch (DownloadClientAuthenticationException ex)
+            {
+                _logger.ErrorException(ex.Message, ex);
+                return new NzbDroneValidationFailure("Username", "Authentication failure")
+                {
+                    DetailedDescription = "Please verify your username and password."
+                };
+            }
+            catch (WebException ex)
+            {
+                _logger.ErrorException(ex.Message, ex);
+                if (ex.Status == WebExceptionStatus.ConnectFailure)
+                {
+                    return new NzbDroneValidationFailure("Host", "Unable to connect")
+                    {
+                        DetailedDescription = "Please verify the hostname and port."
+                    };
+                }
+                return new NzbDroneValidationFailure(String.Empty, "Unknown exception: " + ex.Message);
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException(ex.Message, ex);
+                return new NzbDroneValidationFailure(String.Empty, "Unknown exception: " + ex.Message);
+            }
+
+            return null;
+        }
+
+        private ValidationFailure TestGetTorrents()
+        {
+            try
+            {
+                _proxy.GetTorrents(Settings);
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException(ex.Message, ex);
+                return new NzbDroneValidationFailure(String.Empty, "Failed to get the list of torrents: " + ex.Message);
+            }
+
+            return null;
+        }
+    }
+}

src/NzbDrone.Core/Download/Clients/qBittorrent/QBittorrentPriority.cs

@@ -0,0 +1,8 @@
+namespace NzbDrone.Core.Download.Clients.QBittorrent
+{
+    public enum QBittorrentPriority
+    {
+        Last = 0,
+        First = 1
+    }
+}

src/NzbDrone.Core/Download/Clients/qBittorrent/QBittorrentProxy.cs

@@ -0,0 +1,192 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using NLog;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Rest;
+using RestSharp;
+using NzbDrone.Common.Cache;
+
+namespace NzbDrone.Core.Download.Clients.QBittorrent
+{
+    // API https://github.com/qbittorrent/qBittorrent/wiki/WebUI-API-Documentation
+
+    public interface IQBittorrentProxy
+    {
+        int GetVersion(QBittorrentSettings settings);
+        Dictionary<string, Object> GetConfig(QBittorrentSettings settings);
+        List<QBittorrentTorrent> GetTorrents(QBittorrentSettings settings);
+
+        void AddTorrentFromUrl(string torrentUrl, QBittorrentSettings settings);
+        void AddTorrentFromFile(string fileName, Byte[] fileContent, QBittorrentSettings settings);
+
+        void RemoveTorrent(string hash, Boolean removeData, QBittorrentSettings settings);
+        void SetTorrentLabel(string hash, string label, QBittorrentSettings settings);
+        void MoveTorrentToTopInQueue(string hash, QBittorrentSettings settings);
+    }
+
+    public class QBittorrentProxy : IQBittorrentProxy
+    {
+        private readonly Logger _logger;
+        private readonly CookieContainer _cookieContainer;
+        private readonly ICached<bool> _logins;
+        private readonly TimeSpan _loginTimeout = TimeSpan.FromSeconds(10);
+
+        public QBittorrentProxy(ICacheManager cacheManager, Logger logger)
+        {
+            _logger = logger;
+            _cookieContainer = new CookieContainer();
+            _logins = cacheManager.GetCache<bool>(GetType(), "logins");
+        }
+
+        public int GetVersion(QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/version/api", Method.GET);
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+            response.ValidateResponse(client);
+            return Convert.ToInt32(response.Content);
+        }
+
+        public Dictionary<string, Object> GetConfig(QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/query/preferences", Method.GET);
+            request.RequestFormat = DataFormat.Json;
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+            response.ValidateResponse(client);
+            return response.Read<Dictionary<string, Object>>(client);
+        }
+
+        public List<QBittorrentTorrent> GetTorrents(QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/query/torrents", Method.GET);
+            request.RequestFormat = DataFormat.Json;
+            request.AddParameter("label", settings.TvCategory);
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+            response.ValidateResponse(client);
+            return response.Read<List<QBittorrentTorrent>>(client);
+        }
+
+        public void AddTorrentFromUrl(string torrentUrl, QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/command/download", Method.POST);
+            request.AddParameter("urls", torrentUrl);
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+            response.ValidateResponse(client);
+        }
+
+        public void AddTorrentFromFile(string fileName, Byte[] fileContent, QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/command/upload", Method.POST);
+            request.AddFile("torrents", fileContent, fileName);
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+            response.ValidateResponse(client);
+        }
+
+        public void RemoveTorrent(string hash, Boolean removeData, QBittorrentSettings settings)
+        {
+            var cmd = removeData ? "/command/deletePerm" : "/command/delete";
+            var request = new RestRequest(cmd, Method.POST);
+            request.AddParameter("hashes", hash);
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+            response.ValidateResponse(client);
+        }
+
+        public void SetTorrentLabel(string hash, string label, QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/command/setLabel", Method.POST);
+            request.AddParameter("hashes", hash);
+            request.AddParameter("label", label);
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+            response.ValidateResponse(client);
+        }
+
+        public void MoveTorrentToTopInQueue(string hash, QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/command/topPrio", Method.POST);
+            request.AddParameter("hashes", hash);
+
+            var client = BuildClient(settings);
+            var response = ProcessRequest(client, request, settings);
+
+            // qBittorrent rejects all Prio commands with 403: Forbidden if Options -> BitTorrent -> Torrent Queueing is not enabled
+            if (response.StatusCode == HttpStatusCode.Forbidden)
+            {
+                return;
+            }
+
+            response.ValidateResponse(client);
+        }
+
+        private IRestResponse ProcessRequest(IRestClient client, IRestRequest request, QBittorrentSettings settings)
+        {
+            var response = client.Execute(request);
+
+            if (response.StatusCode == HttpStatusCode.Forbidden)
+            {
+                _logger.Info("Authentication required, logging in.");
+
+                var loggedIn = _logins.Get(settings.Username + settings.Password, () => Login(client, settings), _loginTimeout);
+
+                if (!loggedIn)
+                {
+                    throw new DownloadClientAuthenticationException("Failed to authenticate");
+                }
+
+                // success! retry the original request
+                response = client.Execute(request);
+            }
+
+            return response;
+        }
+
+        private bool Login(IRestClient client, QBittorrentSettings settings)
+        {
+            var request = new RestRequest("/login", Method.POST);
+            request.AddParameter("username", settings.Username);
+            request.AddParameter("password", settings.Password);
+
+            var response = client.Execute(request);
+
+            if (response.StatusCode != HttpStatusCode.OK)
+            {
+                _logger.Warn("Login failed with {0}.", response.StatusCode);
+                return false;
+            }
+
+            if (response.Content != "Ok.") // returns "Fails." on bad login
+            {
+                _logger.Warn("Login failed, incorrect username or password.");
+                return false;
+            }
+
+            response.ValidateResponse(client);
+            return true;
+        }
+
+        private IRestClient BuildClient(QBittorrentSettings settings)
+        {
+            var protocol = settings.UseSsl ? "https" : "http";
+            var url = String.Format(@"{0}://{1}:{2}", protocol, settings.Host, settings.Port);
+            var client = RestClientFactory.BuildClient(url);
+
+            client.Authenticator = new DigestAuthenticator(settings.Username, settings.Password);
+            client.CookieContainer = _cookieContainer;
+            return client;
+        }
+    }
+}

src/NzbDrone.Core/Download/Clients/qBittorrent/QBittorrentSettings.cs

@@ -0,0 +1,58 @@
+using System;
+using FluentValidation;
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.ThingiProvider;
+using NzbDrone.Core.Validation;
+
+namespace NzbDrone.Core.Download.Clients.QBittorrent
+{
+    public class QBittorrentSettingsValidator : AbstractValidator<QBittorrentSettings>
+    {
+        public QBittorrentSettingsValidator()
+        {
+            RuleFor(c => c.Host).ValidHost();
+            RuleFor(c => c.Port).InclusiveBetween(0, 65535);
+        }
+    }
+
+    public class QBittorrentSettings : IProviderConfig
+    {
+        private static readonly QBittorrentSettingsValidator Validator = new QBittorrentSettingsValidator();
+
+        public QBittorrentSettings()
+        {
+            Host = "localhost";
+            Port = 9091;
+            TvCategory = "tv-sonarr";
+        }
+
+        [FieldDefinition(0, Label = "Host", Type = FieldType.Textbox)]
+        public string Host { get; set; }
+
+        [FieldDefinition(1, Label = "Port", Type = FieldType.Textbox)]
+        public int Port { get; set; }
+
+        [FieldDefinition(2, Label = "Username", Type = FieldType.Textbox)]
+        public string Username { get; set; }
+
+        [FieldDefinition(3, Label = "Password", Type = FieldType.Password)]
+        public string Password { get; set; }
+
+        [FieldDefinition(4, Label = "Category", Type = FieldType.Textbox, HelpText = "Adding a category specific to Sonarr avoids conflicts with unrelated downloads, but it's optional")]
+        public string TvCategory { get; set; }
+
+        [FieldDefinition(5, Label = "Recent Priority", Type = FieldType.Select, SelectOptions = typeof(QBittorrentPriority), HelpText = "Priority to use when grabbing episodes that aired within the last 14 days")]
+        public int RecentTvPriority { get; set; }
+
+        [FieldDefinition(6, Label = "Older Priority", Type = FieldType.Select, SelectOptions = typeof(QBittorrentPriority), HelpText = "Priority to use when grabbing episodes that aired over 14 days ago")]
+        public int OlderTvPriority { get; set; }
+
+        [FieldDefinition(7, Label = "Use SSL", Type = FieldType.Checkbox, HelpText = "Use a secure connection. See Options -> Web UI -> 'Use HTTPS instead of HTTP' in qBittorrent.")]
+        public bool UseSsl { get; set; }
+
+        public NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
+    }
+}

src/NzbDrone.Core/Download/Clients/qBittorrent/QBittorrentTorrent.cs

@@ -0,0 +1,26 @@
+using Newtonsoft.Json;
+using System;
+
+namespace NzbDrone.Core.Download.Clients.QBittorrent
+{
+    // torrent properties from the list returned by /query/torrents
+    public class QBittorrentTorrent
+    {
+        public string Hash { get; set; } // Torrent hash
+
+        public string Name { get; set; } // Torrent name
+
+        public long Size { get; set; } // Torrent size (bytes)
+
+        public double Progress { get; set; } // Torrent progress (%/100)
+
+        public int Eta { get; set; } // Torrent ETA (seconds)
+
+        public string State { get; set; } // Torrent state. See possible values here below
+
+        public string Label { get; set; } // Label of the torrent
+
+        [JsonProperty(PropertyName = "save_path")]
+        public string SavePath { get; set; } // Torrent save path
+    }
+}

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -356,7 +356,13 @@
     <Compile Include="Download\Clients\Nzbget\NzbgetSettings.cs" />
     <Compile Include="Download\Clients\Pneumatic\Pneumatic.cs" />
     <Compile Include="Download\Clients\Pneumatic\PneumaticSettings.cs" />
+    <Compile Include="Download\Clients\qBittorrent\DigestAuthenticator.cs" />
     <Compile Include="Download\Clients\rTorrent\RTorrentDirectoryValidator.cs" />
+    <Compile Include="Download\Clients\qBittorrent\QBittorrent.cs" />
+    <Compile Include="Download\Clients\qBittorrent\QBittorrentPriority.cs" />
+    <Compile Include="Download\Clients\qBittorrent\QBittorrentProxy.cs" />
+    <Compile Include="Download\Clients\qBittorrent\QBittorrentSettings.cs" />
+    <Compile Include="Download\Clients\qBittorrent\QBittorrentTorrent.cs" />
     <Compile Include="Download\Clients\Sabnzbd\JsonConverters\SabnzbdPriorityTypeConverter.cs" />
     <Compile Include="Download\Clients\Sabnzbd\JsonConverters\SabnzbdQueueTimeConverter.cs" />
     <Compile Include="Download\Clients\Sabnzbd\Responses\SabnzbdRetryResponse.cs" />