Add and use ILinkHandler interface

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);
+    }
+}