Add auth fallback for use in offline servers

Author: michael-r-elp

MultiplayerCore/Patches/PlatformAuthenticationTokenProviderPatch.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using HarmonyLib;
+
+namespace MultiplayerCore.Patches
+{
+	[HarmonyPatch]
+	internal class PlatformAuthenticationTokenProviderPatch
+	{
+		public static readonly string DummyAuth = "77686f5f69735f72656d5f3f";
+
+		[HarmonyPostfix]
+		[HarmonyPatch(typeof(PlatformAuthenticationTokenProvider), nameof(PlatformAuthenticationTokenProvider.GetAuthenticationToken))]
+		private static void GetAuthenticationToken(PlatformAuthenticationTokenProvider __instance, ref Task<AuthenticationToken> __result)
+		{
+			__result = __result.ContinueWith<AuthenticationToken>(task =>
+			{
+				AuthenticationToken result;
+				if (task.IsFaulted || string.IsNullOrWhiteSpace((result = task.Result).sessionToken))
+				{
+					Plugin.Logger.Error("An error occurred while attempting to get the auth token: " + task.Exception);
+					Plugin.Logger.Warn("Failed to get auth token, returning custom authentication token!");
+					return new AuthenticationToken(__instance.platform, __instance.hashedUserId, __instance.userName, DummyAuth);
+				}
+				Plugin.Logger.Debug("Successfully got auth token!");
+				return result;
+			});
+		}
+	}
+}