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/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 584d3a0f839cbcb6b3161f695c7f7d4869d04577..ae48897bd52934d35fcb10c545ae79cc4fb57d5a 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -244,4 +244,9 @@ public class PaperConfig {
     private static void regionFileCacheSize() {
         regionFileCacheSize = Math.max(getInt("settings.region-file-cache-size", 256), 4);
     }
+
+    public static boolean enablePlayerCollisions = true;
+    private static void enablePlayerCollisions() {
+        enablePlayerCollisions = getBoolean("settings.enable-player-collisions", true);
+    }
 }
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..c5339618c195507c1d1482e4e77e262e8db240a5 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(!com.destroystokyo.paper.PaperConfig.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 68a4fa890250f6c54367cbe319dd9485c988bbb7..4a84a0cea0ccc5de699c5b1e1a6686a72b954e40 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -150,6 +150,7 @@ import net.minecraft.world.level.storage.loot.LootTables;
 import net.minecraft.world.level.storage.loot.PredicateManager;
 import net.minecraft.world.phys.Vec2;
 import net.minecraft.world.phys.Vec3;
+import net.minecraft.world.scores.PlayerTeam; // Paper
 import org.apache.commons.lang3.Validate;
 import org.slf4j.Logger;
 
@@ -576,6 +577,20 @@ 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(PlayerTeam::getName).collect(java.util.stream.Collectors.toList());
+        for (String teamName : toRemove) {
+            scoreboard.removePlayerTeam(scoreboard.getPlayerTeam(teamName)); // Clean up after ourselves
+        }
+
+        if (!com.destroystokyo.paper.PaperConfig.enablePlayerCollisions) {
+            this.getPlayerList().collideRuleTeamName = org.apache.commons.lang3.StringUtils.left("collideRule_" + java.util.concurrent.ThreadLocalRandom.current().nextInt(), 16);
+            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 4cf2264208ce681d92441cd06bf8120d586bc82a..e0b279d9437b30ca4a18a3036bf59664570a746f 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -98,6 +98,7 @@ 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;
 
@@ -154,6 +155,7 @@ 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, RegistryAccess.Frozen registryManager, PlayerDataStorage saveHandler, int maxPlayers) {
         this.cserver = server.server = new CraftServer((DedicatedServer) server, this);
@@ -389,6 +391,13 @@ 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());
     }
 
@@ -508,6 +517,16 @@ 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();
@@ -1136,6 +1155,13 @@ 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