Fixed: NRE importing Spotify saved albums / followed artists (#962)

src/NzbDrone.Core.Test/ImportListTests/Spotify/SpotifyFollowedArtistsFixture.cs

@@ -0,0 +1,173 @@
+using System.Collections.Generic;
+using FluentAssertions;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Core.ImportLists.Spotify;
+using NzbDrone.Core.Test.Framework;
+using SpotifyAPI.Web;
+using SpotifyAPI.Web.Models;
+
+namespace NzbDrone.Core.Test.ImportListTests
+{
+    [TestFixture]
+    public class SpotifyFollowedArtistsFixture : CoreTest<SpotifyFollowedArtists>
+    {
+        // placeholder, we don't use real API
+        private readonly SpotifyWebAPI api = null;
+
+        [Test]
+        public void should_not_throw_if_followed_is_null()
+        {
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetFollowedArtists(It.IsAny<SpotifyFollowedArtists>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(default(FollowedArtists));
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_not_throw_if_followed_artists_is_null()
+        {
+            var followed = new FollowedArtists {
+                Artists = null
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetFollowedArtists(It.IsAny<SpotifyFollowedArtists>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(followed);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_not_throw_if_followed_artist_items_is_null()
+        {
+            var followed = new FollowedArtists {
+                Artists = new CursorPaging<FullArtist> {
+                    Items = null
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetFollowedArtists(It.IsAny<SpotifyFollowedArtists>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(followed);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+            Subject.Fetch(api);
+        }
+
+        [Test]
+        public void should_not_throw_if_artist_is_null()
+        {
+            var followed = new FollowedArtists {
+                Artists = new CursorPaging<FullArtist> {
+                    Items = new List<FullArtist> {
+                        null
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetFollowedArtists(It.IsAny<SpotifyFollowedArtists>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(followed);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+            Subject.Fetch(api);
+        }
+
+        [Test]
+        public void should_parse_followed_artist()
+        {
+            var followed = new FollowedArtists {
+                Artists = new CursorPaging<FullArtist> {
+                    Items = new List<FullArtist> {
+                        new FullArtist {
+                            Name = "artist"
+                        }
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetFollowedArtists(It.IsAny<SpotifyFollowedArtists>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(followed);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().HaveCount(1);
+        }
+
+        [Test]
+        public void should_not_throw_if_get_next_page_returns_null()
+        {
+            var followed = new FollowedArtists {
+                Artists = new CursorPaging<FullArtist> {
+                    Items = new List<FullArtist> {
+                        new FullArtist {
+                            Name = "artist"
+                        }
+                    },
+                    Next = "DummyToMakeHasNextTrue"
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetFollowedArtists(It.IsAny<SpotifyFollowedArtists>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(followed);
+
+            Mocker.GetMock<ISpotifyProxy>()
+                .Setup(x => x.GetNextPage(It.IsAny<SpotifyFollowedArtists>(),
+                                          It.IsAny<SpotifyWebAPI>(),
+                                          It.IsAny<CursorPaging<FullArtist>>()))
+                .Returns(default(CursorPaging<FullArtist>));
+
+            var result = Subject.Fetch(api);
+
+            result.Should().HaveCount(1);
+
+            Mocker.GetMock<ISpotifyProxy>()
+                .Verify(v => v.GetNextPage(It.IsAny<SpotifyFollowedArtists>(),
+                                           It.IsAny<SpotifyWebAPI>(),
+                                           It.IsAny<CursorPaging<FullArtist>>()),
+                        Times.Once());
+        }
+
+        [TestCase(null)]
+        [TestCase("")]
+        public void should_skip_bad_artist_names(string name)
+        {
+            var followed = new FollowedArtists {
+                Artists = new CursorPaging<FullArtist> {
+                    Items = new List<FullArtist> {
+                        new FullArtist {
+                            Name = name
+                        }
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetFollowedArtists(It.IsAny<SpotifyFollowedArtists>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(followed);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+        }
+    }
+}

src/NzbDrone.Core.Test/ImportListTests/Spotify/SpotifyPlaylistFixture.cs

@@ -0,0 +1,239 @@
+using System.Collections.Generic;
+using FluentAssertions;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Core.ImportLists.Spotify;
+using NzbDrone.Core.Test.Framework;
+using SpotifyAPI.Web;
+using SpotifyAPI.Web.Models;
+
+namespace NzbDrone.Core.Test.ImportListTests
+{
+    [TestFixture]
+    public class SpotifyPlaylistFixture : CoreTest<SpotifyPlaylist>
+    {
+        // placeholder, we don't use real API
+        private readonly SpotifyWebAPI api = null;
+
+        [Test]
+        public void should_not_throw_if_playlist_tracks_is_null()
+        {
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetPlaylistTracks(It.IsAny<SpotifyPlaylist>(),
+                                               It.IsAny<SpotifyWebAPI>(),
+                                               It.IsAny<string>(),
+                                               It.IsAny<string>()))
+                .Returns(default(Paging<PlaylistTrack>));
+
+            var result = Subject.Fetch(api, "playlistid");
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_not_throw_if_playlist_tracks_items_is_null()
+        {
+            var playlistTracks = new Paging<PlaylistTrack> {
+                Items = null
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetPlaylistTracks(It.IsAny<SpotifyPlaylist>(),
+                                               It.IsAny<SpotifyWebAPI>(),
+                                               It.IsAny<string>(),
+                                               It.IsAny<string>()))
+                .Returns(playlistTracks);
+
+            var result = Subject.Fetch(api, "playlistid");
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_not_throw_if_playlist_track_is_null()
+        {
+            var playlistTracks = new Paging<PlaylistTrack> {
+                Items = new List<PlaylistTrack> {
+                    null
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetPlaylistTracks(It.IsAny<SpotifyPlaylist>(),
+                                               It.IsAny<SpotifyWebAPI>(),
+                                               It.IsAny<string>(),
+                                               It.IsAny<string>()))
+                .Returns(playlistTracks);
+
+            var result = Subject.Fetch(api, "playlistid");
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_use_album_artist_when_it_exists()
+        {
+            var playlistTracks = new Paging<PlaylistTrack> {
+                Items = new List<PlaylistTrack> {
+                    new PlaylistTrack {
+                        Track = new FullTrack {
+                            Album = new SimpleAlbum {
+                                Name = "Album",
+                                Artists = new List<SimpleArtist> {
+                                    new SimpleArtist {
+                                        Name = "AlbumArtist"
+                                    }
+                                }
+                            },
+                            Artists = new List<SimpleArtist> {
+                                new SimpleArtist {
+                                    Name = "TrackArtist"
+                                }
+                            }
+                        }
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetPlaylistTracks(It.IsAny<SpotifyPlaylist>(),
+                                               It.IsAny<SpotifyWebAPI>(),
+                                               It.IsAny<string>(),
+                                               It.IsAny<string>()))
+                .Returns(playlistTracks);
+
+            var result = Subject.Fetch(api, "playlistid");
+
+            result.Should().HaveCount(1);
+            result[0].Artist.Should().Be("AlbumArtist");
+        }
+
+        [Test]
+        public void should_fall_back_to_track_artist_if_album_artist_missing()
+        {
+            var playlistTracks = new Paging<PlaylistTrack> {
+                Items = new List<PlaylistTrack> {
+                    new PlaylistTrack {
+                        Track = new FullTrack {
+                            Album = new SimpleAlbum {
+                                Name = "Album",
+                                Artists = new List<SimpleArtist> {
+                                    new SimpleArtist {
+                                        Name = null
+                                    }
+                                }
+                            },
+                            Artists = new List<SimpleArtist> {
+                                new SimpleArtist {
+                                    Name = "TrackArtist"
+                                }
+                            }
+                        }
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetPlaylistTracks(It.IsAny<SpotifyPlaylist>(),
+                                               It.IsAny<SpotifyWebAPI>(),
+                                               It.IsAny<string>(),
+                                               It.IsAny<string>()))
+                .Returns(playlistTracks);
+
+            var result = Subject.Fetch(api, "playlistid");
+
+            result.Should().HaveCount(1);
+            result[0].Artist.Should().Be("TrackArtist");
+        }
+
+
+        [TestCase(null, null, "Album")]
+        [TestCase("AlbumArtist", null, null)]
+        [TestCase(null, "TrackArtist", null)]
+        public void should_skip_bad_artist_or_album_names(string albumArtistName, string trackArtistName, string albumName)
+        {
+            var playlistTracks = new Paging<PlaylistTrack> {
+                Items = new List<PlaylistTrack> {
+                    new PlaylistTrack {
+                        Track = new FullTrack {
+                            Album = new SimpleAlbum {
+                                Name = albumName,
+                                Artists = new List<SimpleArtist> {
+                                    new SimpleArtist {
+                                        Name = albumArtistName
+                                    }
+                                }
+                            },
+                            Artists = new List<SimpleArtist> {
+                                new SimpleArtist {
+                                    Name = trackArtistName
+                                }
+                            }
+                        }
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetPlaylistTracks(It.IsAny<SpotifyPlaylist>(),
+                                               It.IsAny<SpotifyWebAPI>(),
+                                               It.IsAny<string>(),
+                                               It.IsAny<string>()))
+                .Returns(playlistTracks);
+
+            var result = Subject.Fetch(api, "playlistid");
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_not_throw_if_get_next_page_returns_null()
+        {
+            var playlistTracks = new Paging<PlaylistTrack> {
+                Items = new List<PlaylistTrack> {
+                    new PlaylistTrack {
+                        Track = new FullTrack {
+                            Album = new SimpleAlbum {
+                                Name = "Album",
+                                Artists = new List<SimpleArtist> {
+                                    new SimpleArtist {
+                                        Name = null
+                                    }
+                                }
+                            },
+                            Artists = new List<SimpleArtist> {
+                                new SimpleArtist {
+                                    Name = "TrackArtist"
+                                }
+                            }
+                        }
+                    }
+                },
+                Next = "DummyToMakeHasNextTrue"
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetPlaylistTracks(It.IsAny<SpotifyPlaylist>(),
+                                               It.IsAny<SpotifyWebAPI>(),
+                                               It.IsAny<string>(),
+                                               It.IsAny<string>()))
+                .Returns(playlistTracks);
+
+            Mocker.GetMock<ISpotifyProxy>()
+                .Setup(x => x.GetNextPage(It.IsAny<SpotifyFollowedArtists>(),
+                                          It.IsAny<SpotifyWebAPI>(),
+                                          It.IsAny<Paging<PlaylistTrack>>()))
+                .Returns(default(Paging<PlaylistTrack>));
+
+            var result = Subject.Fetch(api, "playlistid");
+
+            result.Should().HaveCount(1);
+
+            Mocker.GetMock<ISpotifyProxy>()
+                .Verify(x => x.GetNextPage(It.IsAny<SpotifyPlaylist>(),
+                                           It.IsAny<SpotifyWebAPI>(),
+                                           It.IsAny<Paging<PlaylistTrack>>()),
+                        Times.Once());
+        }
+    }
+}

src/NzbDrone.Core.Test/ImportListTests/Spotify/SpotifySavedAlbumsFixture.cs

@@ -0,0 +1,166 @@
+using System.Collections.Generic;
+using FluentAssertions;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Core.ImportLists.Spotify;
+using NzbDrone.Core.Test.Framework;
+using SpotifyAPI.Web;
+using SpotifyAPI.Web.Models;
+
+namespace NzbDrone.Core.Test.ImportListTests
+{
+    [TestFixture]
+    public class SpotifySavedAlbumsFixture : CoreTest<SpotifySavedAlbums>
+    {
+        // placeholder, we don't use real API
+        private readonly SpotifyWebAPI api = null;
+
+        [Test]
+        public void should_not_throw_if_saved_albums_is_null()
+        {
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetSavedAlbums(It.IsAny<SpotifySavedAlbums>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(default(Paging<SavedAlbum>));
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_not_throw_if_saved_album_items_is_null()
+        {
+            var savedAlbums = new Paging<SavedAlbum> {
+                Items = null
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetSavedAlbums(It.IsAny<SpotifySavedAlbums>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(savedAlbums);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+        }
+
+        [Test]
+        public void should_not_throw_if_saved_album_is_null()
+        {
+            var savedAlbums = new Paging<SavedAlbum> {
+                Items = new List<SavedAlbum> {
+                    null
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetSavedAlbums(It.IsAny<SpotifySavedAlbums>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(savedAlbums);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+        }
+
+        [TestCase("Artist", "Album")]
+        public void should_parse_saved_album(string artistName, string albumName)
+        {
+            var savedAlbums = new Paging<SavedAlbum> {
+                Items = new List<SavedAlbum> {
+                    new SavedAlbum {
+                        Album = new FullAlbum {
+                            Name = albumName,
+                            Artists = new List<SimpleArtist> {
+                                new SimpleArtist {
+                                    Name = artistName
+                                }
+                            }
+                        }
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetSavedAlbums(It.IsAny<SpotifySavedAlbums>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(savedAlbums);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().HaveCount(1);
+        }
+
+        [Test]
+        public void should_not_throw_if_get_next_page_returns_null()
+        {
+            var savedAlbums = new Paging<SavedAlbum> {
+                Items = new List<SavedAlbum> {
+                    new SavedAlbum {
+                        Album = new FullAlbum {
+                            Name = "Album",
+                            Artists = new List<SimpleArtist> {
+                                new SimpleArtist {
+                                    Name = "Artist"
+                                }
+                            }
+                        }
+                    }
+                },
+                Next = "DummyToMakeHasNextTrue"
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetSavedAlbums(It.IsAny<SpotifySavedAlbums>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(savedAlbums);
+
+            Mocker.GetMock<ISpotifyProxy>()
+                .Setup(x => x.GetNextPage(It.IsAny<SpotifyFollowedArtists>(),
+                                          It.IsAny<SpotifyWebAPI>(),
+                                          It.IsAny<Paging<SavedAlbum>>()))
+                .Returns(default(Paging<SavedAlbum>));
+
+            var result = Subject.Fetch(api);
+
+            result.Should().HaveCount(1);
+
+            Mocker.GetMock<ISpotifyProxy>()
+                .Verify(x => x.GetNextPage(It.IsAny<SpotifySavedAlbums>(),
+                                           It.IsAny<SpotifyWebAPI>(),
+                                           It.IsAny<Paging<SavedAlbum>>()),
+                        Times.Once());
+        }
+
+        [TestCase(null, "Album")]
+        [TestCase("Artist", null)]
+        [TestCase(null, null)]
+        public void should_skip_bad_artist_or_album_names(string artistName, string albumName)
+        {
+            var savedAlbums = new Paging<SavedAlbum> {
+                Items = new List<SavedAlbum> {
+                    new SavedAlbum {
+                        Album = new FullAlbum {
+                            Name = albumName,
+                            Artists = new List<SimpleArtist> {
+                                new SimpleArtist {
+                                    Name = artistName
+                                }
+                            }
+                        }
+                    }
+                }
+            };
+
+            Mocker.GetMock<ISpotifyProxy>().
+                Setup(x => x.GetSavedAlbums(It.IsAny<SpotifySavedAlbums>(),
+                                                It.IsAny<SpotifyWebAPI>()))
+                .Returns(savedAlbums);
+
+            var result = Subject.Fetch(api);
+
+            result.Should().BeEmpty();
+        }
+    }
+}

src/NzbDrone.Core/ImportLists/Spotify/SpotifyFollowedArtists.cs

@@ -6,7 +6,7 @@ using NzbDrone.Core.Configuration;
 using NzbDrone.Core.Parser;
 using NzbDrone.Core.Parser.Model;
 using SpotifyAPI.Web;
-using SpotifyAPI.Web.Enums;
+using SpotifyAPI.Web.Models;
 
 namespace NzbDrone.Core.ImportLists.Spotify
 {
@@ -17,13 +17,14 @@ namespace NzbDrone.Core.ImportLists.Spotify
 
     public class SpotifyFollowedArtists : SpotifyImportListBase<SpotifyFollowedArtistsSettings>
     {
-        public SpotifyFollowedArtists(IImportListStatusService importListStatusService,
+        public SpotifyFollowedArtists(ISpotifyProxy spotifyProxy,
+                                      IImportListStatusService importListStatusService,
                                       IImportListRepository importListRepository,
                                       IConfigService configService,
                                       IParsingService parsingService,
-                                      HttpClient httpClient,
+                                      IHttpClient httpClient,
                                       Logger logger)
-        : base(importListStatusService, importListRepository, configService, parsingService, httpClient, logger)
+        : base(spotifyProxy, importListStatusService, importListRepository, configService, parsingService, httpClient, logger)
         {
         }
 
@@ -32,27 +33,43 @@ namespace NzbDrone.Core.ImportLists.Spotify
         public override IList<ImportListItemInfo> Fetch(SpotifyWebAPI api)
         {
             var result = new List<ImportListItemInfo>();
-            
-            var followed = Execute(api, (x) => x.GetFollowedArtists(FollowType.Artist, 50));
-            var artists = followed.Artists;
+
+            var followedArtists = _spotifyProxy.GetFollowedArtists(this, api);
+            var artists = followedArtists?.Artists;
+
             while (true)
             {
+                if (artists?.Items == null)
+                {
+                    return result;
+                }
+
                 foreach (var artist in artists.Items)
                 {
-                    if (artist.Name.IsNotNullOrWhiteSpace())
-                    {
-                        result.AddIfNotNull(new ImportListItemInfo
-                                            {
-                                                Artist = artist.Name,
-                                            });
-                    }
+                    result.AddIfNotNull(ParseFullArtist(artist));
                 }
+
                 if (!artists.HasNext())
+                {
                     break;
-                artists = Execute(api, (x) => x.GetNextPage(artists));
+                }
+
+                artists = _spotifyProxy.GetNextPage(this, api, artists);
             }
 
             return result;
         }
+
+        private ImportListItemInfo ParseFullArtist(FullArtist artist)
+        {
+            if (artist?.Name.IsNotNullOrWhiteSpace() ?? false)
+            {
+                return new ImportListItemInfo {
+                    Artist = artist.Name,
+                };
+            }
+
+            return null;
+        }
     }
 }

src/NzbDrone.Core/ImportLists/Spotify/SpotifyImportListBase.cs

@@ -20,21 +20,27 @@ namespace NzbDrone.Core.ImportLists.Spotify
         private IHttpClient _httpClient;
         private IImportListRepository _importListRepository;
 
-        public SpotifyImportListBase(IImportListStatusService importListStatusService,
-                                     IImportListRepository importListRepository,
-                                     IConfigService configService,
-                                     IParsingService parsingService,
-                                     HttpClient httpClient,
-                                     Logger logger)
+        protected ISpotifyProxy _spotifyProxy;
+
+        protected SpotifyImportListBase(ISpotifyProxy spotifyProxy,
+                                        IImportListStatusService importListStatusService,
+                                        IImportListRepository importListRepository,
+                                        IConfigService configService,
+                                        IParsingService parsingService,
+                                        IHttpClient httpClient,
+                                        Logger logger)
         : base(importListStatusService, configService, parsingService, logger)
         {
             _httpClient = httpClient;
             _importListRepository = importListRepository;
+            _spotifyProxy = spotifyProxy;
         }
 
         public override ImportListType ListType => ImportListType.Spotify;
 
-        private void RefreshToken()
+        public string AccessToken => Settings.AccessToken;
+
+        public void RefreshToken()
         {
             _logger.Trace("Refreshing Token");
 
@@ -68,7 +74,7 @@ namespace NzbDrone.Core.ImportLists.Spotify
 
         }
         
-        protected SpotifyWebAPI GetApi()
+        public SpotifyWebAPI GetApi()
         {
             Settings.Validate().Filter("AccessToken", "RefreshToken").ThrowOnError();
             _logger.Trace($"Access token expires at {Settings.Expires}");
@@ -85,35 +91,6 @@ namespace NzbDrone.Core.ImportLists.Spotify
             };
         }
 
-        protected T Execute<T>(SpotifyWebAPI api, Func<SpotifyWebAPI, T> method, bool allowReauth = true) where T : BasicModel
-        {
-            T result = method(api);
-            if (result.HasError())
-            {
-                // If unauthorized, refresh token and try again
-                if (result.Error.Status == 401)
-                {
-                    if (allowReauth)
-                    {
-                        _logger.Debug("Spotify authorization error, refreshing token and retrying");
-                        RefreshToken();
-                        api.AccessToken = Settings.AccessToken;
-                        return Execute(api, method, false);
-                    }
-                    else
-                    {
-                        throw new SpotifyAuthorizationException(result.Error.Message);
-                    }
-                }
-                else
-                {
-                    throw new SpotifyException("[{0}] {1}", result.Error.Status, result.Error.Message);
-                }
-            }
-
-            return result;
-        }
-
         public override IList<ImportListItemInfo> Fetch()
         {
             using (var api = GetApi())
@@ -162,7 +139,7 @@ namespace NzbDrone.Core.ImportLists.Spotify
             {
                 using (var api = GetApi())
                 {
-                    var profile = Execute(api, (x) => x.GetPrivateProfile());
+                    var profile = _spotifyProxy.GetPrivateProfile(this, api);
                     _logger.Debug($"Connected to spotify profile {profile.DisplayName} [{profile.Id}]");
                     return null;
                 }

src/NzbDrone.Core/ImportLists/Spotify/SpotifyPlaylist.cs

@@ -15,60 +15,77 @@ namespace NzbDrone.Core.ImportLists.Spotify
 {
     public class SpotifyPlaylist : SpotifyImportListBase<SpotifyPlaylistSettings>
     {
-        public SpotifyPlaylist(IImportListStatusService importListStatusService,
+        public SpotifyPlaylist(ISpotifyProxy spotifyProxy,
+                               IImportListStatusService importListStatusService,
                                IImportListRepository importListRepository,
                                IConfigService configService,
                                IParsingService parsingService,
-                               HttpClient httpClient,
+                               IHttpClient httpClient,
                                Logger logger)
-        : base(importListStatusService, importListRepository, configService, parsingService, httpClient, logger)
+        : base(spotifyProxy, importListStatusService, importListRepository, configService, parsingService, httpClient, logger)
         {
         }
 
         public override string Name => "Spotify Playlists";
 
         public override IList<ImportListItemInfo> Fetch(SpotifyWebAPI api)
+        {
+            return Settings.PlaylistIds.SelectMany(x => Fetch(api, x)).ToList();
+        }
+
+        public IList<ImportListItemInfo> Fetch(SpotifyWebAPI api, string playlistId)
         {
             var result = new List<ImportListItemInfo>();
 
-            foreach (var id in Settings.PlaylistIds)
-            {
-                _logger.Trace($"Processing playlist {id}");
+            _logger.Trace($"Processing playlist {playlistId}");
+
+            var playlistTracks = _spotifyProxy.GetPlaylistTracks(this, api, playlistId, "next, items(track(name, album(name,artists)))");
 
-                var playlistTracks = Execute(api, (x) => x.GetPlaylistTracks(id, fields: "next, items(track(name, album(name,artists)))"));
-                while (true)
+            while (true)
+            {
+                if (playlistTracks?.Items == null)
                 {
-                    foreach (var track in playlistTracks.Items)
-                    {
-                        var fullTrack = track.Track;
-                        // From spotify docs: "Note, a track object may be null. This can happen if a track is no longer available."
-                        if (fullTrack != null)
-                        {
-                            var album = fullTrack.Album?.Name;
-                            var artist = fullTrack.Album?.Artists?.FirstOrDefault()?.Name ?? fullTrack.Artists.FirstOrDefault()?.Name;
+                    return result;
+                }
 
-                            if (album.IsNotNullOrWhiteSpace() && artist.IsNotNullOrWhiteSpace())
-                            {
-                                result.AddIfNotNull(new ImportListItemInfo
-                                                    {
-                                                        Artist = artist,
-                                                        Album = album,
-                                                        ReleaseDate = ParseSpotifyDate(fullTrack.Album.ReleaseDate, fullTrack.Album.ReleaseDatePrecision)
-                                                    });
-                                
-                            }
-                        }
-                    }
+                foreach (var playlistTrack in playlistTracks.Items)
+                {
+                    result.AddIfNotNull(ParsePlaylistTrack(playlistTrack));
+                }
                         
-                    if (!playlistTracks.HasNextPage())
-                        break;
-                    playlistTracks = Execute(api, (x) => x.GetNextPage(playlistTracks));
+                if (!playlistTracks.HasNextPage())
+                {
+                    break;
                 }
+
+                playlistTracks = _spotifyProxy.GetNextPage(this, api, playlistTracks);
             }
 
             return result;
         }
 
+        private ImportListItemInfo ParsePlaylistTrack(PlaylistTrack playlistTrack)
+        {
+            // From spotify docs: "Note, a track object may be null. This can happen if a track is no longer available."
+            if (playlistTrack?.Track?.Album != null)
+            {
+                var album = playlistTrack.Track.Album;
+                var albumName = album.Name;
+                var artistName = album.Artists?.FirstOrDefault()?.Name ?? playlistTrack.Track?.Artists?.FirstOrDefault()?.Name;
+
+                if (albumName.IsNotNullOrWhiteSpace() && artistName.IsNotNullOrWhiteSpace())
+                {
+                    return new ImportListItemInfo {
+                        Artist = artistName,
+                        Album = albumName,
+                        ReleaseDate = ParseSpotifyDate(album.ReleaseDate, album.ReleaseDatePrecision)
+                    };
+                }
+            }
+
+            return null;
+        }
+
         public override object RequestAction(string action, IDictionary<string, string> query)
         {
             if (action == "getPlaylists")
@@ -87,18 +104,26 @@ namespace NzbDrone.Core.ImportLists.Spotify
                 {
                     try
                     {
-                        var profile = Execute(api, (x) => x.GetPrivateProfile());
-                        var playlistPage = Execute(api, (x) => x.GetUserPlaylists(profile.Id));
+                        var profile = _spotifyProxy.GetPrivateProfile(this, api);
+                        var playlistPage = _spotifyProxy.GetUserPlaylists(this, api, profile.Id);
                         _logger.Trace($"Got {playlistPage.Total} playlists");
 
                         var playlists = new List<SimplePlaylist>(playlistPage.Total);
                         while (true)
                         {
+                            if (playlistPage == null)
+                            {
+                                break;
+                            }
+
                             playlists.AddRange(playlistPage.Items);
 
                             if (!playlistPage.HasNextPage())
+                            {
                                 break;
-                            playlistPage = Execute(api, (x) => x.GetNextPage(playlistPage));
+                            }
+
+                            playlistPage = _spotifyProxy.GetNextPage(this, api, playlistPage);
                         }
 
                         return new

src/NzbDrone.Core/ImportLists/Spotify/SpotifyProxy.cs

@@ -0,0 +1,109 @@
+using System;
+using NLog;
+using SpotifyAPI.Web;
+using SpotifyAPI.Web.Enums;
+using SpotifyAPI.Web.Models;
+
+namespace NzbDrone.Core.ImportLists.Spotify
+{
+    public interface ISpotifyProxy
+    {
+        PrivateProfile GetPrivateProfile<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
+        Paging<SimplePlaylist> GetUserPlaylists<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, string id)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
+        FollowedArtists GetFollowedArtists<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
+        Paging<SavedAlbum> GetSavedAlbums<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
+        Paging<PlaylistTrack> GetPlaylistTracks<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, string id, string fields)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
+        Paging<T> GetNextPage<T, TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, Paging<T> item)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
+        CursorPaging<T> GetNextPage<T, TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, CursorPaging<T> item)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
+    }
+
+    public class SpotifyProxy : ISpotifyProxy
+    {
+        private readonly Logger _logger;
+
+        public SpotifyProxy(Logger logger)
+        {
+            _logger = logger;
+        }
+
+        public PrivateProfile GetPrivateProfile<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, x => x.GetPrivateProfile());
+        }
+
+        public Paging<SimplePlaylist> GetUserPlaylists<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, string id)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, x => x.GetUserPlaylists(id));
+        }
+
+        public FollowedArtists GetFollowedArtists<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, x => x.GetFollowedArtists(FollowType.Artist));
+        }
+
+        public Paging<SavedAlbum> GetSavedAlbums<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, x => x.GetSavedAlbums(50));
+        }
+
+        public Paging<PlaylistTrack> GetPlaylistTracks<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, string id, string fields)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, x => x.GetPlaylistTracks(id, fields: fields));
+        }
+
+        public Paging<T> GetNextPage<T, TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, Paging<T> item)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, (x) => x.GetNextPage(item));
+        }
+
+        public CursorPaging<T> GetNextPage<T, TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, CursorPaging<T> item)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, (x) => x.GetNextPage(item));
+        }
+
+        public T Execute<T, TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, Func<SpotifyWebAPI, T> method, bool allowReauth = true)
+            where T : BasicModel
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            T result = method(api);
+            if (result.HasError())
+            {
+                // If unauthorized, refresh token and try again
+                if (result.Error.Status == 401)
+                {
+                    if (allowReauth)
+                    {
+                        _logger.Debug("Spotify authorization error, refreshing token and retrying");
+                        list.RefreshToken();
+                        api.AccessToken = list.AccessToken;
+                        return Execute(list, api, method, false);
+                    }
+                    else
+                    {
+                        throw new SpotifyAuthorizationException(result.Error.Message);
+                    }
+                }
+                else
+                {
+                    throw new SpotifyException("[{0}] {1}", result.Error.Status, result.Error.Message);
+                }
+            }
+
+            return result;
+        }
+    }
+}

src/NzbDrone.Core/ImportLists/Spotify/SpotifySavedAlbums.cs

@@ -7,6 +7,7 @@ using NzbDrone.Core.Configuration;
 using NzbDrone.Core.Parser;
 using NzbDrone.Core.Parser.Model;
 using SpotifyAPI.Web;
+using SpotifyAPI.Web.Models;
 
 namespace NzbDrone.Core.ImportLists.Spotify
 {
@@ -17,13 +18,14 @@ namespace NzbDrone.Core.ImportLists.Spotify
 
     public class SpotifySavedAlbums : SpotifyImportListBase<SpotifySavedAlbumsSettings>
     {
-        public SpotifySavedAlbums(IImportListStatusService importListStatusService,
+        public SpotifySavedAlbums(ISpotifyProxy spotifyProxy,
+                                  IImportListStatusService importListStatusService,
                                   IImportListRepository importListRepository,
                                   IConfigService configService,
                                   IParsingService parsingService,
-                                  HttpClient httpClient,
+                                  IHttpClient httpClient,
                                   Logger logger)
-        : base(importListStatusService, importListRepository, configService, parsingService, httpClient, logger)
+        : base(spotifyProxy, importListStatusService, importListRepository, configService, parsingService, httpClient, logger)
         {
         }
 
@@ -33,32 +35,49 @@ namespace NzbDrone.Core.ImportLists.Spotify
         {
             var result = new List<ImportListItemInfo>();
 
-            var albums = Execute(api, (x) => x.GetSavedAlbums(50));
-            _logger.Trace($"Got {albums.Total} saved albums");
+            var savedAlbums = _spotifyProxy.GetSavedAlbums(this, api);
+
+            _logger.Trace($"Got {savedAlbums?.Total ?? 0} saved albums");
 
             while (true)
             {
-                foreach (var album in albums.Items)
+                if (savedAlbums?.Items == null)
                 {
-                    var artistName = album.Album.Artists.FirstOrDefault()?.Name;
-                    var albumName = album.Album.Name;
-                    _logger.Trace($"Adding {artistName} - {albumName}");
+                    return result;
+                }
 
-                    if (artistName.IsNotNullOrWhiteSpace() && albumName.IsNotNullOrWhiteSpace())
-                    {
-                        result.AddIfNotNull(new ImportListItemInfo
-                                            {
-                                                Artist = artistName,
-                                                Album = albumName
-                                            });
-                    }
+                foreach (var savedAlbum in savedAlbums.Items)
+                {
+                    result.AddIfNotNull(ParseSavedAlbum(savedAlbum));
                 }
-                if (!albums.HasNextPage())
+
+                if (!savedAlbums.HasNextPage())
+                {
                     break;
-                albums = Execute(api, (x) => x.GetNextPage(albums));
+                }
+
+                savedAlbums = _spotifyProxy.GetNextPage(this, api, savedAlbums);
             }
 
             return result;
         }
+
+        private ImportListItemInfo ParseSavedAlbum(SavedAlbum savedAlbum)
+        {
+            var artistName = savedAlbum?.Album?.Artists?.FirstOrDefault()?.Name;
+            var albumName = savedAlbum?.Album?.Name;
+            _logger.Trace($"Adding {artistName} - {albumName}");
+
+            if (artistName.IsNotNullOrWhiteSpace() && albumName.IsNotNullOrWhiteSpace())
+            {
+                return new ImportListItemInfo {
+                    Artist = artistName,
+                    Album = albumName,
+                    ReleaseDate = ParseSpotifyDate(savedAlbum?.Album?.ReleaseDate, savedAlbum?.Album?.ReleaseDatePrecision)
+                };
+            }
+
+            return null;
+        }
     }
 }