Display banned status in Steam lobbies

desktop/src/mindustry/desktop/steam/SNet.java

@@ -107,6 +107,9 @@ public class SNet implements SteamNetworkingCallback, SteamMatchmakingCallback,
 
         Events.on(WaveEvent.class, e -> updateWave());
         Events.run(Trigger.newGame, this::updateWave);
+
+        Events.on(PlayerIpBanEvent.class, e -> updateBans(e.ip));
+        Events.on(PlayerIpUnbanEvent.class, e -> updateBans(e.ip));
     }
 
     public boolean isSteamClient(){
@@ -207,6 +210,12 @@ public class SNet implements SteamNetworkingCallback, SteamMatchmakingCallback,
         }
     }
 
+    /** Updates the ban list so that lobbies don't appear for banned players. The list will only be updated when a steam player is banned/unbanned. */
+    void updateBans(String changed){
+        if(changed != null && !changed.startsWith("steam:")) return; //hacky way to ignore non-steam ids
+        smat.setLobbyData(currentLobby, "banned", netServer.admins.bannedIPs.select(ip -> ip.contains("steam:")).reduce(new StringBuilder(), (ip, str) -> str.append(ip.substring(6)).append(',')).toString()); //list of handles split by commas
+    }
+
     @Override
     public void closeServer(){
         provider.closeServer();
@@ -321,6 +330,11 @@ public class SNet implements SteamNetworkingCallback, SteamMatchmakingCallback,
                     String mode = smat.getLobbyData(lobby, "gamemode");
                     //make sure versions are equal, don't list incompatible lobbies
                     if(mode == null || mode.isEmpty() || (Version.build != -1 && Strings.parseInt(smat.getLobbyData(lobby, "version"), -1) != Version.build)) continue;
+
+                    String banList = smat.getLobbyData(lobby, "banned");
+
+                    boolean banned = banList.length() > 0 && Structs.contains(banList.split(","), SVars.user.user.getSteamID().getAccountID() + "");
+
                     Host out = new Host(
                         -1, //invalid ping
                         smat.getLobbyData(lobby, "name"),
@@ -332,7 +346,7 @@ public class SNet implements SteamNetworkingCallback, SteamMatchmakingCallback,
                         smat.getLobbyData(lobby, "versionType"),
                         Gamemode.valueOf(mode),
                         smat.getLobbyMemberLimit(lobby),
-                        "",
+                        banned ? "[banned]" : "",
                         null
                     );
                     hosts.add(out);
@@ -365,6 +379,7 @@ public class SNet implements SteamNetworkingCallback, SteamMatchmakingCallback,
             smat.setLobbyData(steamID, "versionType", Version.type);
             smat.setLobbyData(steamID, "wave", state.wave + "");
             smat.setLobbyData(steamID, "gamemode", state.rules.mode().name() + "");
+            updateBans(null);
         }
     }