Add a per-player handicap option to the lobby.

Handicaps reduce unit health, firepower, and build speed.

OpenRA.Mods.Common/ServerTraits/LobbyCommands.cs

@@ -43,6 +43,7 @@ namespace OpenRA.Mods.Common.Server
 			{ "name", Name },
 			{ "faction", Faction },
 			{ "team", Team },
+			{ "handicap", Handicap },
 			{ "spawn", Spawn },
 			{ "clear_spawn", ClearPlayerSpawn },
 			{ "color", PlayerColor },
@@ -245,6 +246,7 @@ namespace OpenRA.Mods.Common.Server
 					client.Slot = null;
 					client.SpawnPoint = 0;
 					client.Team = 0;
+					client.Handicap = 0;
 					client.Color = Color.White;
 					server.SyncLobbyClients();
 					CheckAutoStart(server);
@@ -377,6 +379,7 @@ namespace OpenRA.Mods.Common.Server
 						Faction = "Random",
 						SpawnPoint = 0,
 						Team = 0,
+						Handicap = 0,
 						State = Session.ClientState.NotReady,
 						BotControllerClientIndex = controllerClientIndex
 					};
@@ -736,6 +739,7 @@ namespace OpenRA.Mods.Common.Server
 				targetClient.Slot = null;
 				targetClient.SpawnPoint = 0;
 				targetClient.Team = 0;
+				targetClient.Handicap = 0;
 				targetClient.Color = Color.White;
 				targetClient.State = Session.ClientState.NotReady;
 				server.SendMessage("{0} moved {1} to spectators.".F(client.Name, targetClient.Name));
@@ -824,6 +828,42 @@ namespace OpenRA.Mods.Common.Server
 			}
 		}
 
+		static bool Handicap(S server, Connection conn, Session.Client client, string s)
+		{
+			lock (server.LobbyInfo)
+			{
+				var parts = s.Split(' ');
+				var targetClient = server.LobbyInfo.ClientWithIndex(Exts.ParseIntegerInvariant(parts[0]));
+
+				// Only the host can change other client's info
+				if (targetClient.Index != client.Index && !client.IsAdmin)
+					return true;
+
+				// Map has disabled handicap changes
+				if (server.LobbyInfo.Slots[targetClient.Slot].LockHandicap)
+					return true;
+
+				if (!Exts.TryParseIntegerInvariant(parts[1], out var handicap))
+				{
+					Log.Write("server", "Invalid handicap: {0}", s);
+					return false;
+				}
+
+				// Handicaps may be set between 0 - 95% in steps of 5%
+				var options = Enumerable.Range(0, 20).Select(i => 5 * i);
+				if (!options.Contains(handicap))
+				{
+					Log.Write("server", "Invalid handicap: {0}", s);
+					return false;
+				}
+
+				targetClient.Handicap = handicap;
+				server.SyncLobbyClients();
+
+				return true;
+			}
+		}
+
 		static bool ClearPlayerSpawn(S server, Connection conn, Session.Client client, string s)
 		{
 			var spawnPoint = Exts.ParseIntegerInvariant(s);
@@ -1003,6 +1043,7 @@ namespace OpenRA.Mods.Common.Server
 				LockFaction = pr.LockFaction,
 				LockColor = pr.LockColor,
 				LockTeam = pr.LockTeam,
+				LockHandicap = pr.LockHandicap,
 				LockSpawn = pr.LockSpawn,
 				Required = pr.Required,
 			};