Add and use ILinkHandler interface

osu.Game/Graphics/Containers/LinkFlowContainer.cs

@@ -13,6 +13,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Localisation;
 using osu.Framework.Platform;
+using osu.Game.Online;
 using osu.Game.Users;
 
 namespace osu.Game.Graphics.Containers
@@ -25,7 +26,7 @@ namespace osu.Game.Graphics.Containers
         }
 
         [Resolved(CanBeNull = true)]
-        private OsuGame game { get; set; }
+        private ILinkHandler linkHandler { get; set; }
 
         [Resolved]
         private GameHost host { get; set; }
@@ -81,8 +82,8 @@ namespace osu.Game.Graphics.Containers
             {
                 if (action != null)
                     action();
-                else if (game != null)
-                    game.HandleLink(link);
+                else if (linkHandler != null)
+                    linkHandler.HandleLink(link);
                 // fallback to handle cases where OsuGame is not available, ie. tournament client.
                 else if (link.Action == LinkAction.External)
                     host.OpenUrlExternally(link.Argument.ToString());

osu.Game/Graphics/Containers/Markdown/OsuMarkdownLinkText.cs

@@ -8,6 +8,7 @@ using Markdig.Syntax.Inlines;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers.Markdown;
+using osu.Game.Online;
 using osu.Game.Online.Chat;
 using osu.Game.Overlays;
 
@@ -16,7 +17,7 @@ namespace osu.Game.Graphics.Containers.Markdown
     public class OsuMarkdownLinkText : MarkdownLinkText
     {
         [Resolved(canBeNull: true)]
-        private OsuGame game { get; set; }
+        private ILinkHandler linkHandler { get; set; }
 
         private readonly string text;
         private readonly string title;
@@ -51,7 +52,7 @@ namespace osu.Game.Graphics.Containers.Markdown
             };
         }
 
-        protected override void OnLinkPressed() => game?.HandleLink(Url);
+        protected override void OnLinkPressed() => linkHandler?.HandleLink(Url);
 
         private class OsuMarkdownLinkCompiler : DrawableLinkCompiler
         {

osu.Game/Online/ILinkHandler.cs

@@ -0,0 +1,30 @@
+// 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 osu.Framework.Allocation;
+using osu.Game.Online.Chat;
+
+namespace osu.Game.Online
+{
+    /// <summary>
+    /// Handle an arbitrary URL. Displays via in-game overlays where possible.
+    /// Methods can be called from a non-thread-safe non-game-loaded state.
+    /// </summary>
+    [Cached]
+    public interface ILinkHandler
+    {
+        /// <summary>
+        /// Handle an arbitrary URL. Displays via in-game overlays where possible.
+        /// This can be called from a non-thread-safe non-game-loaded state.
+        /// </summary>
+        /// <param name="url">The URL to load.</param>
+        void HandleLink(string url);
+
+        /// <summary>
+        /// Handle a specific <see cref="LinkDetails"/>.
+        /// This can be called from a non-thread-safe non-game-loaded state.
+        /// </summary>
+        /// <param name="link">The link to load.</param>
+        void HandleLink(LinkDetails link);
+    }
+}

osu.Game/OsuGame.cs

@@ -39,6 +39,7 @@ using osu.Game.Input;
 using osu.Game.Input.Bindings;
 using osu.Game.IO;
 using osu.Game.Localisation;
+using osu.Game.Online;
 using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Online.Chat;
 using osu.Game.Overlays;
@@ -69,7 +70,7 @@ namespace osu.Game
     /// The full osu! experience. Builds on top of <see cref="OsuGameBase"/> to add menus and binding logic
     /// for initial components that are generally retrieved via DI.
     /// </summary>
-    public class OsuGame : OsuGameBase, IKeyBindingHandler<GlobalAction>, ILocalUserPlayInfo, IPerformFromScreenRunner, IOverlayManager
+    public class OsuGame : OsuGameBase, IKeyBindingHandler<GlobalAction>, ILocalUserPlayInfo, IPerformFromScreenRunner, IOverlayManager, ILinkHandler
     {
         /// <summary>
         /// The amount of global offset to apply when a left/right anchored overlay is displayed (ie. settings or notifications).