New: Use Artist/Album aliases for indexer search and parsing

src/NzbDrone.Core/Datastore/Migration/035_release_group_alias.cs

@@ -0,0 +1,14 @@
+using FluentMigrator;
+using NzbDrone.Core.Datastore.Migration.Framework;
+
+namespace NzbDrone.Core.Datastore.Migration
+{
+    [Migration(35)]
+    public class release_group_alias : NzbDroneMigrationBase
+    {
+        protected override void MainDbUpgrade()
+        {
+            Alter.Table("Albums").AddColumn("Aliases").AsString().WithDefaultValue("[]");
+        }
+    }
+}

src/NzbDrone.Core/DecisionEngine/Specifications/Search/SingleAlbumSearchMatchSpecification.cs

@@ -31,15 +31,15 @@ namespace NzbDrone.Core.DecisionEngine.Specifications.Search
                 return Decision.Accept();
             }
 
-            if (Parser.Parser.CleanArtistName(singleAlbumSpec.AlbumTitle) != Parser.Parser.CleanArtistName(remoteAlbum.ParsedAlbumInfo.AlbumTitle))
+            if (!remoteAlbum.Albums.Any(x => x.Title == singleAlbumSpec.AlbumTitle))
             {
                 _logger.Debug("Album does not match searched album title, skipping.");
                 return Decision.Reject("Wrong album");
             }
 
-            if (!remoteAlbum.ParsedAlbumInfo.AlbumTitle.Any())
+            if (remoteAlbum.Albums.Count > 1)
             {
-                _logger.Debug("Full discography result during single album search, skipping.");
+                _logger.Debug("Discography result during single album search, skipping.");
                 return Decision.Reject("Full artist pack");
             }
 

src/NzbDrone.Core/IndexerSearch/Definitions/AlbumSearchCriteria.cs

@@ -1,3 +1,6 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using NzbDrone.Common.Extensions;
 
 namespace NzbDrone.Core.IndexerSearch.Definitions
@@ -5,10 +8,21 @@ namespace NzbDrone.Core.IndexerSearch.Definitions
     public class AlbumSearchCriteria : SearchCriteriaBase
     {
         public string AlbumTitle { get; set; }
+        public List<string> AlbumAliases { get; set; }
         public int AlbumYear { get; set; }
         public string Disambiguation { get; set; }
 
-        public string AlbumQuery => GetQueryTitle($"{AlbumTitle}{(Disambiguation.IsNullOrWhiteSpace() ? string.Empty : $"+{Disambiguation}")}");
+        public string AlbumQuery => GetQueryTitle(AddDisambiguation(AlbumTitle));
+
+        public List<string> AlbumQueries => OrderQueries(AlbumTitle, AlbumAliases)
+            .Select(x => GetQueryTitle(AddDisambiguation(x)))
+            .Distinct()
+            .ToList();
+
+        private string AddDisambiguation(string term)
+        {
+            return Disambiguation.IsNullOrWhiteSpace() ? term : $"{term}+{Disambiguation}";
+        }
 
         public override string ToString()
         {

src/NzbDrone.Core/IndexerSearch/Definitions/SearchCriteriaBase.cs

@@ -12,6 +12,7 @@ namespace NzbDrone.Core.IndexerSearch.Definitions
         private static readonly Regex SpecialCharacter = new Regex(@"[`'’.]", RegexOptions.IgnoreCase | RegexOptions.Compiled);
         private static readonly Regex NonWord = new Regex(@"[\W]", RegexOptions.IgnoreCase | RegexOptions.Compiled);
         private static readonly Regex BeginningThe = new Regex(@"^the\s", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+        private static readonly Regex IsAllWord = new Regex(@"^[\sA-Za-z0-9_`'’.&:-]*$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
         public virtual bool MonitoredEpisodesOnly { get; set; }
         public virtual bool UserInvokedSearch { get; set; }
@@ -22,6 +23,39 @@ namespace NzbDrone.Core.IndexerSearch.Definitions
         public List<Track> Tracks { get; set; }
 
         public string ArtistQuery => GetQueryTitle(Artist.Name);
+        public List<string> ArtistQueries => OrderQueries(Artist.Metadata.Value.Name, Artist.Metadata.Value.Aliases);
+
+        protected List<string> OrderQueries(string title, List<string> aliases)
+        {
+            var result = new List<string>();
+
+            // find the primary search term.  This will be title if there are no special characters in the title,
+            // otherwise the first alias with no special characters
+            if (IsAllWord.IsMatch(title))
+            {
+                result.Add(title);
+            }
+            else
+            {
+                result.Add(aliases.FirstOrDefault(x => IsAllWord.IsMatch(x)) ?? title);
+                result.Add(title);
+            }
+
+            // insert remaining aliases
+            result.AddRange(aliases.Except(result));
+
+            return result;
+        }
+
+        protected List<List<string>> GetQueryTiers(List<string> titles)
+        {
+            var result = new List<List<string>>();
+
+            var queries = titles.Select(GetQueryTitle).Distinct();
+            result.Add(queries.Take(1).ToList());
+            result.Add(queries.Skip(1).ToList());
+            return result;
+        }
 
         public static string GetQueryTitle(string title)
         {

src/NzbDrone.Core/IndexerSearch/NzbSearchService.cs

@@ -73,6 +73,7 @@ namespace NzbDrone.Core.IndexerSearch
             var searchSpec = Get<AlbumSearchCriteria>(artist, new List<Album> { album }, userInvokedSearch, interactiveSearch);
 
             searchSpec.AlbumTitle = album.Title;
+            searchSpec.AlbumAliases = album.Aliases;
             if (album.ReleaseDate.HasValue)
             {
                 searchSpec.AlbumYear = album.ReleaseDate.Value.Year;

src/NzbDrone.Core/Indexers/Newznab/NewznabRequestGenerator.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using NzbDrone.Common.Extensions;
@@ -69,42 +70,83 @@ namespace NzbDrone.Core.Indexers.Newznab
 
             if (SupportsAudioSearch)
             {
-                AddAudioPageableRequests(pageableRequests, searchCriteria,
+                AddAlbumRequests(pageableRequests, searchCriteria, "&artist={0}&album={1}", AddAudioPageableRequests);
-                    NewsnabifyTitle($"&artist={searchCriteria.ArtistQuery}&album={searchCriteria.AlbumQuery}"));
             }
 
             if (SupportsSearch)
             {
-                pageableRequests.AddTier();
+                AddAlbumRequests(pageableRequests, searchCriteria, "&q={0}+{1}", AddSearchPageableRequests);
-
-                pageableRequests.Add(GetPagedRequests(MaxPages, Settings.Categories, "search",
-                    NewsnabifyTitle($"&q={searchCriteria.ArtistQuery}+{searchCriteria.AlbumQuery}")));
             }
 
             return pageableRequests;
         }
 
+        private void AddAlbumRequests(IndexerPageableRequestChain pageableRequests, AlbumSearchCriteria searchCriteria, string paramFormat, Action<IndexerPageableRequestChain, SearchCriteriaBase, string> AddRequests)
+        {
+            var albumQuery = searchCriteria.AlbumQueries[0];
+            var artistQuery = searchCriteria.ArtistQueries[0];
+
+            // search using standard name
+            pageableRequests.AddTier();
+            AddRequests(pageableRequests, searchCriteria, NewsnabifyTitle(string.Format(paramFormat, artistQuery, albumQuery)));
+
+            // using artist alias
+            pageableRequests.AddTier();
+            foreach (var artistAlt in searchCriteria.ArtistQueries.Skip(1))
+            {
+                AddRequests(pageableRequests, searchCriteria, NewsnabifyTitle(string.Format(paramFormat, artistAlt, albumQuery)));
+            }
+
+            // using album alias
+            pageableRequests.AddTier();
+            foreach (var albumAlt in searchCriteria.AlbumQueries.Skip(1))
+            {
+                AddRequests(pageableRequests, searchCriteria, NewsnabifyTitle(string.Format(paramFormat, artistQuery, albumAlt)));
+            }
+
+            // using aliases for both
+            foreach (var artistAlt in searchCriteria.ArtistQueries.Skip(1))
+            {
+                foreach (var albumAlt in searchCriteria.AlbumQueries.Skip(1))
+                {
+                    AddRequests(pageableRequests, searchCriteria, NewsnabifyTitle(string.Format(paramFormat, artistAlt, albumAlt)));
+                }
+            }
+        }
+
         public virtual IndexerPageableRequestChain GetSearchRequests(ArtistSearchCriteria searchCriteria)
         {
             var pageableRequests = new IndexerPageableRequestChain();
 
             if (SupportsAudioSearch)
             {
-                AddAudioPageableRequests(pageableRequests, searchCriteria,
+                AddArtistRequests(pageableRequests, searchCriteria, "&artist={0}", AddAudioPageableRequests);
-                    NewsnabifyTitle($"&artist={searchCriteria.ArtistQuery}"));
             }
 
             if (SupportsSearch)
             {
-                pageableRequests.AddTier();
+                AddArtistRequests(pageableRequests, searchCriteria, "&q={0}", AddSearchPageableRequests);
-
-                pageableRequests.Add(GetPagedRequests(MaxPages, Settings.Categories, "search",
-                    NewsnabifyTitle($"&q={searchCriteria.ArtistQuery}")));
             }
 
             return pageableRequests;
         }
 
+        private void AddArtistRequests(IndexerPageableRequestChain pageableRequests, SearchCriteriaBase searchCriteria, string paramFormat, Action<IndexerPageableRequestChain, SearchCriteriaBase, string> AddRequests)
+        {
+            var artistQuery = searchCriteria.ArtistQueries[0];
+
+            // search using standard name
+            pageableRequests.AddTier();
+            AddRequests(pageableRequests, searchCriteria, NewsnabifyTitle(string.Format(paramFormat, artistQuery)));
+
+            // using artist alias
+            pageableRequests.AddTier();
+            foreach (var artistAlt in searchCriteria.ArtistQueries.Skip(1))
+            {
+                AddRequests(pageableRequests, searchCriteria, NewsnabifyTitle(string.Format(paramFormat, artistAlt)));
+            }
+        }
+
         private void AddAudioPageableRequests(IndexerPageableRequestChain chain, SearchCriteriaBase searchCriteria, string parameters)
         {
             chain.AddTier();
@@ -112,6 +154,11 @@ namespace NzbDrone.Core.Indexers.Newznab
             chain.Add(GetPagedRequests(MaxPages, Settings.Categories, "music", $"&q={parameters}"));
         }
 
+        private void AddSearchPageableRequests(IndexerPageableRequestChain chain, SearchCriteriaBase searchCriteria, string parameters)
+        {
+            chain.Add(GetPagedRequests(MaxPages, Settings.Categories, "search", parameters));
+        }
+
         private IEnumerable<IndexerRequest> GetPagedRequests(int maxPages, IEnumerable<int> categories, string searchType, string parameters)
         {
             if (categories.Empty())

src/NzbDrone.Core/MetadataSource/SkyHook/Resource/AlbumResource.cs

@@ -5,6 +5,12 @@ namespace NzbDrone.Core.MetadataSource.SkyHook.Resource
 {
     public class AlbumResource
     {
+        public AlbumResource()
+        {
+            Aliases = new List<string>();
+        }
+
+        public List<string> Aliases { get; set; }
         public string ArtistId { get; set; }
         public List<ArtistResource> Artists { get; set; }
         public string Disambiguation { get; set; }

src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs

@@ -3,7 +3,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Net;
 using NLog;
-using NzbDrone.Common.Cloud;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Http;
 using NzbDrone.Core.Exceptions;
@@ -300,6 +299,7 @@ namespace NzbDrone.Core.MetadataSource.SkyHook
             album.ForeignAlbumId = resource.Id;
             album.OldForeignAlbumIds = resource.OldIds;
             album.Title = resource.Title;
+            album.Aliases = resource.Aliases;
             album.Overview = resource.Overview;
             album.Disambiguation = resource.Disambiguation;
             album.ReleaseDate = resource.ReleaseDate;

src/NzbDrone.Core/Music/Album.cs

@@ -12,6 +12,7 @@ namespace NzbDrone.Core.Music
     {
         public Album()
         {
+            Aliases = new List<string>();
             Genres = new List<string>();
             Images = new List<MediaCover.MediaCover>();
             Links = new List<Links>();
@@ -28,6 +29,7 @@ namespace NzbDrone.Core.Music
         public string ForeignAlbumId { get; set; }
         public List<string> OldForeignAlbumIds { get; set; }
         public string Title { get; set; }
+        public List<string> Aliases { get; set; }
         public string Overview { get; set; }
         public string Disambiguation { get; set; }
         public DateTime? ReleaseDate { get; set; }
@@ -80,6 +82,7 @@ namespace NzbDrone.Core.Music
                 ForeignAlbumId == other.ForeignAlbumId &&
                 (OldForeignAlbumIds?.SequenceEqual(other.OldForeignAlbumIds) ?? true) &&
                 Title == other.Title &&
+                (Aliases?.SequenceEqual(other.Aliases) ?? true) &&
                 Overview == other.Overview &&
                 Disambiguation == other.Disambiguation &&
                 ReleaseDate == other.ReleaseDate &&
@@ -123,6 +126,7 @@ namespace NzbDrone.Core.Music
                 hash = hash * 23 + ForeignAlbumId.GetHashCode();
                 hash = hash * 23 + OldForeignAlbumIds?.GetHashCode() ?? 0;
                 hash = hash * 23 + Title?.GetHashCode() ?? 0;
+                hash = hash * 23 + Aliases?.GetHashCode() ?? 0;
                 hash = hash * 23 + Overview?.GetHashCode() ?? 0;
                 hash = hash * 23 + Disambiguation?.GetHashCode() ?? 0;
                 hash = hash * 23 + ReleaseDate?.GetHashCode() ?? 0;

src/NzbDrone.Core/Music/AlbumService.cs

@@ -87,6 +87,7 @@ namespace NzbDrone.Core.Music
             var scoringFunctions = new List<Tuple<Func<Album, string, double>, string>> {
                 tc((a, t) => a.CleanTitle.FuzzyMatch(t), cleanTitle),
                 tc((a, t) => a.Title.FuzzyMatch(t), title),
+                tc((a, t) => a.Aliases.Any() ? a.Aliases.Select(x => x.CleanArtistName().FuzzyMatch(t)).Max() : 0, cleanTitle),
                 tc((a, t) => a.CleanTitle.FuzzyMatch(t), title.RemoveBracketsAndContents().CleanArtistName()),
                 tc((a, t) => a.CleanTitle.FuzzyMatch(t), title.RemoveAfterDash().CleanArtistName()),
                 tc((a, t) => a.CleanTitle.FuzzyMatch(t), title.RemoveBracketsAndContents().RemoveAfterDash().CleanArtistName()),

src/NzbDrone.Core/Music/ArtistService.cs

@@ -104,7 +104,8 @@ namespace NzbDrone.Core.Music
             Func< Func<Artist, string, double>, string, Tuple<Func<Artist, string, double>, string>> tc = Tuple.Create;
             var scoringFunctions = new List<Tuple<Func<Artist, string, double>, string>> {
                 tc((a, t) => a.CleanName.FuzzyMatch(t), cleanTitle),
-                tc((a, t) => a.Name.FuzzyMatch(t), title),
+                tc((a, t) => a.Metadata.Value.Name.FuzzyMatch(t), title),
+                tc((a, t) => a.Metadata.Value.Aliases.Any() ? a.Metadata.Value.Aliases.Select(x => x.CleanArtistName().FuzzyMatch(t)).Max() : 0, cleanTitle)
             };
 
             if (title.StartsWith("The ", StringComparison.CurrentCultureIgnoreCase))

src/NzbDrone.Core/Music/RefreshAlbumService.cs

@@ -163,6 +163,7 @@ namespace NzbDrone.Core.Music
             local.LastInfoSync = DateTime.UtcNow;
             local.CleanTitle = remote.CleanTitle;
             local.Title = remote.Title ?? "Unknown";
+            local.Aliases = remote.Aliases;
             local.Overview = remote.Overview.IsNullOrWhiteSpace() ? local.Overview : remote.Overview;
             local.Disambiguation = remote.Disambiguation;
             local.AlbumType = remote.AlbumType;

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -174,6 +174,7 @@
     <Compile Include="Datastore\Migration\031_add_artistmetadataid_constraint.cs" />
     <Compile Include="Datastore\Migration\032_old_ids_and_artist_alias.cs" />
     <Compile Include="Datastore\Migration\033_download_propers_config.cs" />
+    <Compile Include="Datastore\Migration\035_release_group_alias.cs" />
     <Compile Include="Datastore\Migration\Framework\MigrationContext.cs" />
     <Compile Include="Datastore\Migration\Framework\MigrationController.cs" />
     <Compile Include="Datastore\Migration\Framework\MigrationDbFactory.cs" />

src/NzbDrone.Core/Parser/Parser.cs

@@ -322,8 +322,11 @@ namespace NzbDrone.Core.Parser
 
                 simpleTitle = CleanTorrentSuffixRegex.Replace(simpleTitle, string.Empty);
 
-                var escapedArtist = Regex.Escape(artist.Name.RemoveAccent()).Replace(@"\ ", @"[\W_]");
+                var artistAliases = new [] { artist.Name }.Concat(artist.Metadata.Value.Aliases);
-                var escapedAlbums = string.Join("|", album.Select(s => Regex.Escape(s.Title.RemoveAccent())).ToList()).Replace(@"\ ", @"[\W_]");
+                var escapedArtist = string.Join("|", artistAliases.Select(x => Regex.Escape(x.RemoveAccent())).ToList()).Replace(@"\ ", @"[\W_]");
+
+                var albumAliases = album.Select(x => x.Title).Concat(album.SelectMany(x => x.Aliases));
+                var escapedAlbums = string.Join("|", albumAliases.Select(s => Regex.Escape(s.RemoveAccent())).ToList()).Replace(@"\ ", @"[\W_]");
 
                 var releaseRegex = new Regex(@"^(\W*|\b)(?<artist>" + escapedArtist + @")(\W*|\b).*(\W*|\b)(?<album>" + escapedAlbums + @")(\W*|\b)", RegexOptions.IgnoreCase);