Move hashing functionality to ArchiveModelManager

osu.Game/Beatmaps/BeatmapManager.cs

@@ -63,6 +63,8 @@ namespace osu.Game.Beatmaps
 
         public override string[] HandledExtensions => new[] { ".osz" };
 
+        protected override string[] HashableFileTypes => new[] { ".osu" };
+
         protected override string ImportFromStablePath => "Songs";
 
         private readonly RulesetStore rulesets;
@@ -129,9 +131,6 @@ namespace osu.Game.Beatmaps
                 beatmaps.ForEach(b => b.OnlineBeatmapID = null);
         }
 
-        protected override BeatmapSetInfo CheckForExisting(BeatmapSetInfo model) =>
-            beatmaps.ConsumableItems.FirstOrDefault(b => b.Hash == model.Hash);
-
         /// <summary>
         /// Downloads a beatmap.
         /// This will post notifications tracking progress.
@@ -307,20 +306,6 @@ namespace osu.Game.Beatmaps
         /// <returns>Results from the provided query.</returns>
         public IQueryable<BeatmapInfo> QueryBeatmaps(Expression<Func<BeatmapInfo, bool>> query) => beatmaps.Beatmaps.AsNoTracking().Where(query);
 
-        /// <summary>
-        /// Create a SHA-2 hash from the provided archive based on contained beatmap (.osu) file content.
-        /// </summary>
-        private string computeBeatmapSetHash(ArchiveReader reader)
-        {
-            // for now, concatenate all .osu files in the set to create a unique hash.
-            MemoryStream hashable = new MemoryStream();
-            foreach (string file in reader.Filenames.Where(f => f.EndsWith(".osu")))
-                using (Stream s = reader.GetStream(file))
-                    s.CopyTo(hashable);
-
-            return hashable.ComputeSHA2Hash();
-        }
-
         protected override BeatmapSetInfo CreateModel(ArchiveReader reader)
         {
             // let's make sure there are actually .osu files to import.
@@ -339,7 +324,6 @@ namespace osu.Game.Beatmaps
             {
                 OnlineBeatmapSetID = beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID,
                 Beatmaps = new List<BeatmapInfo>(),
-                Hash = computeBeatmapSetHash(reader),
                 Metadata = beatmap.Metadata,
             };
         }