Add OsuOnlineStore for proxying external media lookups

osu.Game/Audio/PreviewTrackManager.cs

@@ -6,9 +6,10 @@ using osu.Framework.Audio;
 using osu.Framework.Audio.Track;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
-using osu.Framework.IO.Stores;
 using osu.Framework.Logging;
 using osu.Game.Beatmaps;
+using osu.Game.Online;
+using osu.Game.Online.API;
 
 namespace osu.Game.Audio
 {
@@ -28,9 +29,9 @@ namespace osu.Game.Audio
         }
 
         [BackgroundDependencyLoader]
-        private void load(AudioManager audioManager)
+        private void load(AudioManager audioManager, IAPIProvider api)
         {
-            trackStore = audioManager.GetTrackStore(new OnlineStore());
+            trackStore = audioManager.GetTrackStore(new OsuOnlineStore(api.APIEndpointUrl));
         }
 
         /// <summary>

osu.Game/Online/OsuOnlineStore.cs

@@ -0,0 +1,29 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.IO.Stores;
+
+namespace osu.Game.Online
+{
+    /// <summary>
+    /// An <see cref="OnlineStore"/> which proxies external media lookups through osu-web.
+    /// </summary>
+    public class OsuOnlineStore : OnlineStore
+    {
+        private readonly string apiEndpointUrl;
+
+        public OsuOnlineStore(string apiEndpointUrl)
+        {
+            this.apiEndpointUrl = apiEndpointUrl;
+        }
+
+        protected override string GetLookupUrl(string url)
+        {
+            if (Uri.TryCreate(url, UriKind.Absolute, out Uri? uri) && uri.Host.EndsWith(@".ppy.sh", StringComparison.OrdinalIgnoreCase))
+                return url;
+
+            return $@"{apiEndpointUrl}/beatmapsets/discussions/media-url?url={url}";
+        }
+    }
+}

osu.Game/OsuGame.cs

@@ -29,6 +29,7 @@ using osu.Framework.Input;
 using osu.Framework.Input.Bindings;
 using osu.Framework.Input.Events;
 using osu.Framework.Input.Handlers.Tablet;
+using osu.Framework.IO.Stores;
 using osu.Framework.Localisation;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
@@ -819,6 +820,8 @@ namespace osu.Game
 
         protected override Container CreateScalingContainer() => new ScalingContainer(ScalingMode.Everything);
 
+        protected override OnlineStore CreateOnlineStore() => new OsuOnlineStore(CreateEndpoints().APIEndpointUrl);
+
         #region Beatmap progression
 
         private void beatmapChanged(ValueChangedEvent<WorkingBeatmap> beatmap)

osu.Game/OsuGameBase.cs

@@ -279,7 +279,7 @@ namespace osu.Game
             dependencies.CacheAs(Storage);
 
             var largeStore = new LargeTextureStore(Host.Renderer, Host.CreateTextureLoaderStore(new NamespacedResourceStore<byte[]>(Resources, @"Textures")));
-            largeStore.AddTextureSource(Host.CreateTextureLoaderStore(new OnlineStore()));
+            largeStore.AddTextureSource(Host.CreateTextureLoaderStore(CreateOnlineStore()));
             dependencies.Cache(largeStore);
 
             dependencies.CacheAs(LocalConfig);