Paper/patches/server/0355-Move-player-to-spawn-point-if-spawn-in-unloaded-worl.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: 2277 <38501234+2277@users.noreply.github.com>
Date: Tue, 31 Mar 2020 10:33:55 +0100
Subject: [PATCH] Move player to spawn point if spawn in unloaded world

If the playerdata contains an invalid world (missing, unloaded, invalid,
etc.), spawn the player at the spawn point of the main world.

Co-authored-by: Wyatt Childers <wchilders@nearce.com>
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>

diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 06926750f21fa9234bcc60b1e932a29a36831bdc..48f3e51d8904a51f146e9b8c8fe195ef012fecd8 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -197,6 +197,7 @@ public abstract class PlayerList {
         }
 
         Optional<CompoundTag> optional = this.load(player); // CraftBukkit - decompile error
+        ResourceKey<Level> resourcekey = null; // Paper
         // CraftBukkit start - Better rename detection
         if (optional.isPresent()) {
             CompoundTag nbttagcompound = optional.get();
@@ -206,19 +207,47 @@ public abstract class PlayerList {
             }
         }
         // CraftBukkit end
-        ResourceKey<Level> resourcekey = (ResourceKey) optional.flatMap((nbttagcompound) -> {
+        // Paper start - move logic in Entity to here, to use bukkit supplied world UUID & reset to main world spawn if no valid world is found
+        boolean[] invalidPlayerWorld = {false};
+        bukkitData: if (optional.isPresent()) {
+            // The main way for bukkit worlds to store the world is the world UUID despite mojang adding custom worlds
+            final org.bukkit.World bWorld;
+            if (optional.get().contains("WorldUUIDMost") && optional.get().contains("WorldUUIDLeast")) {
+                bWorld = org.bukkit.Bukkit.getServer().getWorld(new UUID(optional.get().getLong("WorldUUIDMost"), optional.get().getLong("WorldUUIDLeast")));
+            } else if (optional.get().contains("world", net.minecraft.nbt.Tag.TAG_STRING)) { // Paper - legacy bukkit world name
+                bWorld = org.bukkit.Bukkit.getServer().getWorld(optional.get().getString("world"));
+            } else {
+                break bukkitData; // if neither of the bukkit data points exist, proceed to the vanilla migration section
+            }
+            if (bWorld != null) {
+                resourcekey = ((CraftWorld) bWorld).getHandle().dimension();
+            } else {
+                resourcekey = Level.OVERWORLD;
+                invalidPlayerWorld[0] = true;
+            }
+        }
+        if (resourcekey == null) { // only run the vanilla logic if we haven't found a world from the bukkit data
+        // Below is the vanilla way of getting the dimension, this is for migration from vanilla servers
+        resourcekey = optional.flatMap((nbttagcompound) -> {
+            // Paper end
             DataResult<ResourceKey<Level>> dataresult = DimensionType.parseLegacy(new Dynamic(NbtOps.INSTANCE, nbttagcompound.get("Dimension"))); // CraftBukkit - decompile error
             Logger logger = PlayerList.LOGGER;
 
             Objects.requireNonNull(logger);
-            return dataresult.resultOrPartial(logger::error);
-        }).orElse(player.serverLevel().dimension()); // CraftBukkit - SPIGOT-7507: If no dimension, fall back to existing dimension loaded from "WorldUUID", which in turn defaults to World.OVERWORLD
+            // Paper start - reset to main world spawn if no valid world is found
+            final Optional<ResourceKey<Level>> result = dataresult.resultOrPartial(logger::error);
+            invalidPlayerWorld[0] = result.isEmpty();
+            return result;
+        }).orElse(Level.OVERWORLD); // Paper - revert to vanilla default main world, this isn't an "invalid world" since no player data existed
+        }
+        // Paper end
         ServerLevel worldserver = this.server.getLevel(resourcekey);
         ServerLevel worldserver1;
 
         if (worldserver == null) {
             PlayerList.LOGGER.warn("Unknown respawn dimension {}, defaulting to overworld", resourcekey);
             worldserver1 = this.server.overworld();
+            invalidPlayerWorld[0] = true; // Paper - reset to main world if no world with parsed value is found
         } else {
             worldserver1 = worldserver;
         }
@@ -226,6 +255,10 @@ public abstract class PlayerList {
         // Paper start - Entity#getEntitySpawnReason
         if (optional.isEmpty()) {
             player.spawnReason = org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.DEFAULT; // set Player SpawnReason to DEFAULT on first login
+            // Paper start - reset to main world spawn if first spawn or invalid world
+        }
+        if (optional.isEmpty() || invalidPlayerWorld[0]) {
+            // Paper end - reset to main world spawn if first spawn or invalid world
             player.fudgeSpawnLocation(worldserver1); // Paper - Don't move existing players to world spawn
         }
         // Paper end - Entity#getEntitySpawnReason
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index f1b8e3f06db9bef44319c6d53574b1e7188c5931..04bd6d6bc6af0e423f56329dc3554b04170932f9 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -2317,27 +2317,8 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
             }
             // CraftBukkit end
 
-            // CraftBukkit start - Reset world
-            if (this instanceof ServerPlayer) {
-                Server server = Bukkit.getServer();
-                org.bukkit.World bworld = null;
-
-                // TODO: Remove World related checks, replaced with WorldUID
-                String worldName = nbt.getString("world");
-
-                if (nbt.contains("WorldUUIDMost") && nbt.contains("WorldUUIDLeast")) {
-                    UUID uid = new UUID(nbt.getLong("WorldUUIDMost"), nbt.getLong("WorldUUIDLeast"));
-                    bworld = server.getWorld(uid);
-                } else {
-                    bworld = server.getWorld(worldName);
-                }
-
-                if (bworld == null) {
-                    bworld = ((org.bukkit.craftbukkit.CraftServer) server).getServer().getLevel(Level.OVERWORLD).getWorld();
-                }
-
-                ((ServerPlayer) this).setLevel(bworld == null ? null : ((CraftWorld) bworld).getHandle());
-            }
+            // CraftBukkit start
+            // Paper - move world parsing/loading to PlayerList#placeNewPlayer
             this.getBukkitEntity().readBukkitValues(nbt);
             if (nbt.contains("Bukkit.invisible")) {
                 boolean bukkitInvisible = nbt.getBoolean("Bukkit.invisible");