From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 13 Apr 2016 02:10:49 -0400
Subject: [PATCH] Configurable Player Collision


diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundSetPlayerTeamPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundSetPlayerTeamPacket.java
index 1294b38262505b0d54089e428df9b363219de1f0..ee37ec0de1ca969144824427ae42b0c81434a1b4 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundSetPlayerTeamPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundSetPlayerTeamPacket.java
@@ -193,7 +193,7 @@ public class ClientboundSetPlayerTeamPacket implements Packet<ClientGamePacketLi
             buf.writeComponent(this.displayName);
             buf.writeByte(this.options);
             buf.writeUtf(this.nametagVisibility);
-            buf.writeUtf(this.collisionRule);
+            buf.writeUtf(!io.papermc.paper.configuration.GlobalConfiguration.get().collisions.enablePlayerCollisions ? "never" : this.collisionRule); // Paper
             buf.writeEnum(this.color);
             buf.writeComponent(this.playerPrefix);
             buf.writeComponent(this.playerSuffix);
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 7fca70658ecdc89b79381ca2ab33b931ce6871ae..feee1da3091fdbcef0336ab0ab85fd9f52ccac4b 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -589,6 +589,20 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.server.getPluginManager().callEvent(new org.bukkit.event.world.WorldLoadEvent(worldserver.getWorld()));
         }
 
+        // Paper start - Handle collideRule team for player collision toggle
+        final ServerScoreboard scoreboard = this.getScoreboard();
+        final java.util.Collection<String> toRemove = scoreboard.getPlayerTeams().stream().filter(team -> team.getName().startsWith("collideRule_")).map(net.minecraft.world.scores.PlayerTeam::getName).collect(java.util.stream.Collectors.toList());
+        for (String teamName : toRemove) {
+            scoreboard.removePlayerTeam(scoreboard.getPlayerTeam(teamName)); // Clean up after ourselves
+        }
+
+        if (!io.papermc.paper.configuration.GlobalConfiguration.get().collisions.enablePlayerCollisions) {
+            this.getPlayerList().collideRuleTeamName = org.apache.commons.lang3.StringUtils.left("collideRule_" + java.util.concurrent.ThreadLocalRandom.current().nextInt(), 16);
+            net.minecraft.world.scores.PlayerTeam collideTeam = scoreboard.addPlayerTeam(this.getPlayerList().collideRuleTeamName);
+            collideTeam.setSeeFriendlyInvisibles(false); // Because we want to mimic them not being on a team at all
+        }
+        // Paper end
+
         this.server.enablePlugins(org.bukkit.plugin.PluginLoadOrder.POSTWORLD);
         this.server.getPluginManager().callEvent(new ServerLoadEvent(ServerLoadEvent.LoadType.STARTUP));
         this.connection.acceptConnections();
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 233056040541993dd2c13602970c3438ee2eeba6..1fa3e06326a871d2d9562433c31e3b17a80fd08c 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -99,6 +99,7 @@ import net.minecraft.world.level.storage.PlayerDataStorage;
 import net.minecraft.world.phys.Vec3;
 import net.minecraft.world.scores.Objective;
 import net.minecraft.world.scores.PlayerTeam;
+import net.minecraft.world.scores.Scoreboard; // Paper
 import net.minecraft.world.scores.Team;
 import org.slf4j.Logger;
 
@@ -164,6 +165,7 @@ public abstract class PlayerList {
     // CraftBukkit start
     private CraftServer cserver;
     private final Map<String,ServerPlayer> playersByName = new java.util.HashMap<>();
+    public @Nullable String collideRuleTeamName; // Paper - Team name used for collideRule
 
     public PlayerList(MinecraftServer server, LayeredRegistryAccess<RegistryLayer> registryManager, PlayerDataStorage saveHandler, int maxPlayers) {
         this.cserver = server.server = new CraftServer((DedicatedServer) server, this);
@@ -416,6 +418,13 @@ public abstract class PlayerList {
 
         player.initInventoryMenu();
         // CraftBukkit - Moved from above, added world
+        // Paper start - Add to collideRule team if needed
+        final Scoreboard scoreboard = this.getServer().getLevel(Level.OVERWORLD).getScoreboard();
+        final PlayerTeam collideRuleTeam = scoreboard.getPlayerTeam(this.collideRuleTeamName);
+        if (this.collideRuleTeamName != null && collideRuleTeam != null && player.getTeam() == null) {
+            scoreboard.addPlayerToTeam(player.getScoreboardName(), collideRuleTeam);
+        }
+        // Paper end
         PlayerList.LOGGER.info("{}[{}] logged in with entity id {} at ([{}]{}, {}, {})", player.getName().getString(), s1, player.getId(), worldserver1.serverLevelData.getLevelName(), player.getX(), player.getY(), player.getZ());
     }
 
@@ -535,6 +544,16 @@ public abstract class PlayerList {
         entityplayer.doTick(); // SPIGOT-924
         // CraftBukkit end
 
+        // Paper start - Remove from collideRule team if needed
+        if (this.collideRuleTeamName != null) {
+            final Scoreboard scoreBoard = this.server.getLevel(Level.OVERWORLD).getScoreboard();
+            final PlayerTeam team = scoreBoard.getPlayersTeam(this.collideRuleTeamName);
+            if (entityplayer.getTeam() == team && team != null) {
+                scoreBoard.removePlayerFromTeam(entityplayer.getScoreboardName(), team);
+            }
+        }
+        // Paper end
+
         this.save(entityplayer);
         if (entityplayer.isPassenger()) {
             Entity entity = entityplayer.getRootVehicle();
@@ -1166,6 +1185,13 @@ public abstract class PlayerList {
         }
         // CraftBukkit end
 
+        // Paper start - Remove collideRule team if it exists
+        if (this.collideRuleTeamName != null) {
+            final Scoreboard scoreboard = this.getServer().getLevel(Level.OVERWORLD).getScoreboard();
+            final PlayerTeam team = scoreboard.getPlayersTeam(this.collideRuleTeamName);
+            if (team != null) scoreboard.removePlayerTeam(team);
+        }
+        // Paper end
     }
 
     // CraftBukkit start