New: Custom import lists

Closes #3014

Co-authored-by: TheUltimateCoder <no@e.mail>
(cherry picked from commit 092186dab2b7c91219f9d137c614e068252aa166)

src/NzbDrone.Core/ImportLists/Custom/CustomAPIResource.cs

@@ -0,0 +1,7 @@
+namespace NzbDrone.Core.ImportLists.Custom
+{
+    public class CustomArtist
+    {
+        public string MusicBrainzId { get; set; }
+    }
+}

src/NzbDrone.Core/ImportLists/Custom/CustomImport.cs

@@ -0,0 +1,64 @@
+using System.Collections.Generic;
+using FluentValidation.Results;
+using NLog;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Configuration;
+using NzbDrone.Core.Parser;
+using NzbDrone.Core.Parser.Model;
+
+namespace NzbDrone.Core.ImportLists.Custom
+{
+    public class CustomImport : ImportListBase<CustomSettings>
+    {
+        private readonly ICustomImportProxy _customProxy;
+        public override string Name => "Custom List";
+
+        public override ImportListType ListType => ImportListType.Advanced;
+
+        public CustomImport(ICustomImportProxy customProxy,
+                            IImportListStatusService importListStatusService,
+                            IConfigService configService,
+                            IParsingService parsingService,
+                            Logger logger)
+            : base(importListStatusService, configService, parsingService, logger)
+        {
+            _customProxy = customProxy;
+        }
+
+        public override IList<ImportListItemInfo> Fetch()
+        {
+            var artists = new List<ImportListItemInfo>();
+
+            try
+            {
+                var remoteSeries = _customProxy.GetArtists(Settings);
+
+                foreach (var item in remoteSeries)
+                {
+                    artists.Add(new ImportListItemInfo
+                    {
+                        ArtistMusicBrainzId = item.MusicBrainzId
+                    });
+                }
+
+                _importListStatusService.RecordSuccess(Definition.Id);
+            }
+            catch
+            {
+                _importListStatusService.RecordFailure(Definition.Id);
+            }
+
+            return CleanupListItems(artists);
+        }
+
+        public override object RequestAction(string action, IDictionary<string, string> query)
+        {
+            return new { };
+        }
+
+        protected override void Test(List<ValidationFailure> failures)
+        {
+            failures.AddIfNotNull(_customProxy.Test(Settings));
+        }
+    }
+}

src/NzbDrone.Core/ImportLists/Custom/CustomImportProxy.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+using System.Net;
+using FluentValidation.Results;
+using Newtonsoft.Json;
+using NLog;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Common.Http;
+
+namespace NzbDrone.Core.ImportLists.Custom
+{
+    public interface ICustomImportProxy
+    {
+        List<CustomArtist> GetArtists(CustomSettings settings);
+        ValidationFailure Test(CustomSettings settings);
+    }
+
+    public class CustomImportProxy : ICustomImportProxy
+    {
+        private readonly IHttpClient _httpClient;
+        private readonly Logger _logger;
+
+        public CustomImportProxy(IHttpClient httpClient, Logger logger)
+        {
+            _httpClient = httpClient;
+            _logger = logger;
+        }
+
+        public List<CustomArtist> GetArtists(CustomSettings settings)
+        {
+            return Execute<CustomArtist>(settings);
+        }
+
+        public ValidationFailure Test(CustomSettings settings)
+        {
+            try
+            {
+                GetArtists(settings);
+            }
+            catch (HttpException ex)
+            {
+                if (ex.Response.StatusCode == HttpStatusCode.Unauthorized)
+                {
+                    _logger.Error(ex, "There was an authorization issue. We cannot get the list from the provider.");
+                    return new ValidationFailure("BaseUrl", "It seems we are unauthorized to make this request.");
+                }
+
+                _logger.Error(ex, "Unable to send test message");
+                return new ValidationFailure("BaseUrl", $"We are unable to make the request to that URL. StatusCode: {ex.Response.StatusCode}");
+            }
+            catch (Exception ex)
+            {
+                _logger.Error(ex, "Unable to send test message");
+                return new ValidationFailure("", "Unable to send test message");
+            }
+
+            return null;
+        }
+
+        private List<TResource> Execute<TResource>(CustomSettings settings)
+        {
+            if (settings.BaseUrl.IsNullOrWhiteSpace())
+            {
+                return new List<TResource>();
+            }
+
+            var baseUrl = settings.BaseUrl.TrimEnd('/');
+            var request = new HttpRequestBuilder(baseUrl).Accept(HttpAccept.Json).Build();
+            var response = _httpClient.Get(request);
+            var results = JsonConvert.DeserializeObject<List<TResource>>(response.Content);
+
+            return results;
+        }
+    }
+}

src/NzbDrone.Core/ImportLists/Custom/CustomSettings.cs

@@ -0,0 +1,33 @@
+using FluentValidation;
+
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.Validation;
+
+namespace NzbDrone.Core.ImportLists.Custom
+{
+    public class CustomSettingsValidator : AbstractValidator<CustomSettings>
+    {
+        public CustomSettingsValidator()
+        {
+            RuleFor(c => c.BaseUrl).ValidRootUrl();
+        }
+    }
+
+    public class CustomSettings : IImportListSettings
+    {
+        private static readonly CustomSettingsValidator Validator = new CustomSettingsValidator();
+
+        public CustomSettings()
+        {
+            BaseUrl = "";
+        }
+
+        [FieldDefinition(0, Label = "List URL", HelpText = "The URL for the artist list")]
+        public string BaseUrl { get; set; }
+
+        public NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
+    }
+}

src/NzbDrone.Core/ImportLists/ImportListType.cs

@@ -5,6 +5,7 @@ namespace NzbDrone.Core.ImportLists
         Program,
         Spotify,
         LastFm,
-        Other
+        Other,
+        Advanced
     }
 }