From 64e3e00b0d04cf06cb339c4804a6f30d4668d75f 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 e929ba452..033fcf50e 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -220,4 +220,9 @@ public class PaperConfig {
     private static void regionFileCacheSize() {
         regionFileCacheSize = getInt("settings.region-file-cache-size", 256);
     }
+
+    public static boolean enablePlayerCollisions = true;
+    private static void enablePlayerCollisions() {
+        enablePlayerCollisions = getBoolean("settings.enable-player-collisions", true);
+    }
 }
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index c5359ae24..43cd6d2c6 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -438,6 +438,20 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
             this.loadSpawn(worldserver.getChunkProvider().playerChunkMap.worldLoadListener, worldserver);
         }
 
+        // Paper start - Handle collideRule team for player collision toggle
+        final Scoreboard scoreboard = this.getScoreboard();
+        final java.util.Collection<String> toRemove = scoreboard.getTeams().stream().filter(team -> team.getName().startsWith("collideRule_")).map(ScoreboardTeam::getName).collect(java.util.stream.Collectors.toList());
+        for (String teamName : toRemove) {
+            scoreboard.removeTeam(scoreboard.getTeam(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);
+            ScoreboardTeam collideTeam = scoreboard.createTeam(this.getPlayerList().collideRuleTeamName);
+            collideTeam.setCanSeeFriendlyInvisibles(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));
         // CraftBukkit end
diff --git a/src/main/java/net/minecraft/server/PacketPlayOutScoreboardTeam.java b/src/main/java/net/minecraft/server/PacketPlayOutScoreboardTeam.java
index b0740965a..6b1a914d2 100644
--- a/src/main/java/net/minecraft/server/PacketPlayOutScoreboardTeam.java
+++ b/src/main/java/net/minecraft/server/PacketPlayOutScoreboardTeam.java
@@ -96,7 +96,7 @@ public class PacketPlayOutScoreboardTeam implements Packet<PacketListenerPlayOut
             packetdataserializer.a(this.b);
             packetdataserializer.writeByte(this.j);
             packetdataserializer.a(this.e);
-            packetdataserializer.a(this.f);
+            packetdataserializer.a(!com.destroystokyo.paper.PaperConfig.enablePlayerCollisions ? "never" : this.f); // Paper
             packetdataserializer.a((Enum) this.g);
             packetdataserializer.a(this.c);
             packetdataserializer.a(this.d);
diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
index b3343fca2..7003c4a93 100644
--- a/src/main/java/net/minecraft/server/PlayerList.java
+++ b/src/main/java/net/minecraft/server/PlayerList.java
@@ -72,6 +72,7 @@ public abstract class PlayerList {
     // CraftBukkit start
     private CraftServer cserver;
     private final Map<String,EntityPlayer> playersByName = new java.util.HashMap<>();
+    @Nullable String collideRuleTeamName; // Paper - Team name used for collideRule
 
     public PlayerList(MinecraftServer minecraftserver, int i) {
         this.cserver = minecraftserver.server = new CraftServer((DedicatedServer) minecraftserver, this);
@@ -284,6 +285,13 @@ public abstract class PlayerList {
         }
 
         entityplayer.syncInventory();
+        // Paper start - Add to collideRule team if needed
+        final Scoreboard scoreboard = this.getServer().getWorldServer(DimensionManager.OVERWORLD).getScoreboard();
+        final ScoreboardTeam collideRuleTeam = scoreboard.getTeam(collideRuleTeamName);
+        if (this.collideRuleTeamName != null && collideRuleTeam != null && entityplayer.getScoreboardTeam() == null) {
+            scoreboard.addPlayerToTeam(entityplayer.getName(), collideRuleTeam);
+        }
+        // Paper end
         // CraftBukkit - Moved from above, added world
         PlayerList.LOGGER.info("{}[{}] logged in with entity id {} at ([{}]{}, {}, {})", entityplayer.getDisplayName().getString(), s1, entityplayer.getId(), entityplayer.world.worldData.getName(), entityplayer.locX, entityplayer.locY, entityplayer.locZ);
     }
@@ -402,6 +410,16 @@ public abstract class PlayerList {
         entityplayer.playerTick();// SPIGOT-924
         // CraftBukkit end
 
+        // Paper start - Remove from collideRule team if needed
+        if (this.collideRuleTeamName != null) {
+            final Scoreboard scoreBoard = this.server.getWorldServer(DimensionManager.OVERWORLD).getScoreboard();
+            final ScoreboardTeam team = scoreBoard.getTeam(this.collideRuleTeamName);
+            if (entityplayer.getScoreboardTeam() == team && team != null) {
+                scoreBoard.removePlayerFromTeam(entityplayer.getName(), team);
+            }
+        }
+        // Paper end
+
         this.savePlayerFile(entityplayer);
         if (entityplayer.isPassenger()) {
             Entity entity = entityplayer.getRootVehicle();
@@ -1024,7 +1042,13 @@ public abstract class PlayerList {
             player.playerConnection.disconnect(this.server.server.getShutdownMessage()); // CraftBukkit - add custom shutdown message
         }
         // CraftBukkit end
-
+        // Paper start - Remove collideRule team if it exists
+        if (this.collideRuleTeamName != null) {
+            final Scoreboard scoreboard = this.getServer().getWorldServer(DimensionManager.OVERWORLD).getScoreboard();
+            final ScoreboardTeam team = scoreboard.getTeam(this.collideRuleTeamName);
+            if (team != null) scoreboard.removeTeam(team);
+        }
+        // Paper end
     }
 
     // CraftBukkit start
-- 
2.21.0