Feat : add Liked Songs in Spotify Playlist import list

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

@@ -29,6 +29,8 @@ namespace NzbDrone.Core.ImportLists.Spotify
 
         public override string Name => "Spotify Playlists";
 
+        private const string LIKEDSONGSID = "LikedSongs";
+
         public override IList<SpotifyImportListItemInfo> Fetch(SpotifyWebAPI api)
         {
             return Settings.PlaylistIds.SelectMany(x => Fetch(api, x)).ToList();
@@ -40,7 +42,27 @@ namespace NzbDrone.Core.ImportLists.Spotify
 
             _logger.Trace($"Processing playlist {playlistId}");
 
-            var playlistTracks = _spotifyProxy.GetPlaylistTracks(this, api, playlistId, "next, items(track(name, artists(id, name), album(id, name, release_date, release_date_precision, artists(id, name))))");
+            Paging<PlaylistTrack> playlistTracks;
+
+            if (playlistId.Equals(LIKEDSONGSID))
+            {
+                var savedTracks = _spotifyProxy.GetSavedTracks(this, api);
+                playlistTracks = new Paging<PlaylistTrack>
+                {
+                    Href = savedTracks.Href,
+                    Limit = savedTracks.Limit,
+                    Offset = savedTracks.Offset,
+                    Next = savedTracks.Next,
+                    Previous = savedTracks.Previous,
+                    Total = savedTracks.Total,
+                    Error = savedTracks.Error,
+                    Items = savedTracks.Items.Select(t => new PlaylistTrack { AddedAt = t.AddedAt, Track = t.Track }).ToList()
+                };
+            }
+            else
+            {
+                playlistTracks = _spotifyProxy.GetPlaylistTracks(this, api, playlistId, "next, items(track(name, artists(id, name), album(id, name, release_date, release_date_precision, artists(id, name))))");
+            }
 
             while (true)
             {
@@ -140,7 +162,7 @@ namespace NzbDrone.Core.ImportLists.Spotify
                                     {
                                         id = p.Id,
                                         name = p.Name
-                                    })
+                                    }).Prepend(new { id = LIKEDSONGSID, name = "Liked Songs" }) // TODO : Add Translation
                             }
                         };
                     }

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

@@ -22,7 +22,7 @@ namespace NzbDrone.Core.ImportLists.Spotify
             PlaylistIds = System.Array.Empty<string>();
         }
 
-        public override string Scope => "playlist-read-private";
+        public override string Scope => "playlist-read-private user-library-read";
 
         [FieldDefinition(1, Label = "Playlists", Type = FieldType.Playlist)]
         public IEnumerable<string> PlaylistIds { get; set; }

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

@@ -18,6 +18,8 @@ namespace NzbDrone.Core.ImportLists.Spotify
             where TSettings : SpotifySettingsBase<TSettings>, new();
         Paging<PlaylistTrack> GetPlaylistTracks<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, string id, string fields)
             where TSettings : SpotifySettingsBase<TSettings>, new();
+        Paging<SavedTrack> GetSavedTracks<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new();
         Paging<T> GetNextPage<T, TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, Paging<T> item)
             where TSettings : SpotifySettingsBase<TSettings>, new();
         FollowedArtists GetNextPage<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, FollowedArtists item)
@@ -63,6 +65,12 @@ namespace NzbDrone.Core.ImportLists.Spotify
             return Execute(list, api, x => x.GetPlaylistTracks(id, fields: fields));
         }
 
+        public Paging<SavedTrack> GetSavedTracks<TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api)
+            where TSettings : SpotifySettingsBase<TSettings>, new()
+        {
+            return Execute(list, api, x => x.GetSavedTracks(50));
+        }
+
         public Paging<T> GetNextPage<T, TSettings>(SpotifyImportListBase<TSettings> list, SpotifyWebAPI api, Paging<T> item)
             where TSettings : SpotifySettingsBase<TSettings>, new()
         {