Move import logic to shared implementation

osu.Game/IPC/ArchiveImportIPCChannel.cs

@@ -0,0 +1,49 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using osu.Framework.Platform;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.IPC
+{
+    public class ArchiveImportIPCChannel : IpcChannel<ArchiveImportMessage>
+    {
+        private readonly ICanImportArchives importer;
+
+        public ArchiveImportIPCChannel(IIpcHost host, ICanImportArchives importer = null)
+            : base(host)
+        {
+            this.importer = importer;
+            MessageReceived += msg =>
+            {
+                Debug.Assert(importer != null);
+                ImportAsync(msg.Path).ContinueWith(t =>
+                {
+                    if (t.Exception != null) throw t.Exception;
+                }, TaskContinuationOptions.OnlyOnFaulted);
+            };
+        }
+
+        public async Task ImportAsync(string path)
+        {
+            if (importer == null)
+            {
+                //we want to contact a remote osu! to handle the import.
+                await SendMessageAsync(new ArchiveImportMessage { Path = path });
+                return;
+            }
+
+            if (importer.HandledExtensions.Contains(Path.GetExtension(path)))
+                importer.Import(path);
+        }
+    }
+
+    public class ArchiveImportMessage
+    {
+        public string Path;
+    }
+}