From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <1254957+zachbr@users.noreply.github.com>
Date: Sat, 22 Sep 2018 15:56:59 -0400
Subject: [PATCH] Catch JsonParseException in Entity and TE names

As a result, data that no longer parses correctly will not crash the server
instead just logging the exception and continuing (and in most cases should
fix the data)

Player data is fixed pretty much immediately but some block data (like
Shulkers) may need to be changed in order for it to re-save properly

No more crashing though.

diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -0,0 +0,0 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import it.unimi.dsi.fastutil.objects.ObjectRBTreeSet;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.chat.Component;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.level.ChunkPos;
@@ -0,0 +0,0 @@ public final class MCUtil {
         }
     }
 
+    @Nullable
+    public static Component getBaseComponentFromNbt(String key, CompoundTag compound) {
+        if (!compound.contains(key)) {
+            return null;
+        }
+        String string = compound.getString(key);
+        try {
+            return Component.Serializer.jsonToComponent(string);
+        } catch (com.google.gson.JsonParseException e) {
+            org.bukkit.Bukkit.getLogger().warning("Unable to parse " + key + " from " + compound +": " + e.getMessage());
+        }
+
+        return null;
+    }
+
     public static int getTicketLevelFor(net.minecraft.world.level.chunk.ChunkStatus status) {
         return net.minecraft.server.level.ChunkMap.MAX_VIEW_DISTANCE + net.minecraft.world.level.chunk.ChunkStatus.getDistance(status);
     }
diff --git a/src/main/java/net/minecraft/world/level/BaseCommandBlock.java b/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
+++ b/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
@@ -0,0 +0,0 @@ import net.minecraft.commands.CommandSourceStack;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.chat.TextComponent;
+import net.minecraft.server.MCUtil;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.util.StringUtil;
@@ -0,0 +0,0 @@ public abstract class BaseCommandBlock implements CommandSource {
         this.command = nbt.getString("Command");
         this.successCount = nbt.getInt("SuccessCount");
         if (nbt.contains("CustomName", 8)) {
-            this.setName(Component.Serializer.fromJson(nbt.getString("CustomName")));
+            this.setName(MCUtil.getBaseComponentFromNbt("CustomName", nbt)); // Paper - Catch ParseException
         }
 
         if (nbt.contains("TrackOutput", 1)) {
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BannerBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BannerBlockEntity.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BannerBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BannerBlockEntity.java
@@ -0,0 +0,0 @@ import net.minecraft.nbt.ListTag;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.chat.TranslatableComponent;
 import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
+import net.minecraft.server.MCUtil;
 import net.minecraft.world.Nameable;
 import net.minecraft.world.item.DyeColor;
 import net.minecraft.world.item.ItemStack;
@@ -0,0 +0,0 @@ public class BannerBlockEntity extends BlockEntity implements Nameable {
     public void load(CompoundTag nbt) {
         super.load(nbt);
         if (nbt.contains("CustomName", 8)) {
-            this.name = Component.Serializer.fromJson(nbt.getString("CustomName"));
+            this.name = MCUtil.getBaseComponentFromNbt("CustomName", nbt); // Paper - Catch ParseException
         }
 
         this.itemPatterns = nbt.getList("Patterns", 10);
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BaseContainerBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BaseContainerBlockEntity.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BaseContainerBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BaseContainerBlockEntity.java
@@ -0,0 +0,0 @@ import net.minecraft.core.BlockPos;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.chat.TranslatableComponent;
+import net.minecraft.server.MCUtil;
 import net.minecraft.sounds.SoundEvents;
 import net.minecraft.sounds.SoundSource;
 import net.minecraft.world.Container;
@@ -0,0 +0,0 @@ public abstract class BaseContainerBlockEntity extends BlockEntity implements Co
         super.load(nbt);
         this.lockKey = LockCode.fromTag(nbt);
         if (nbt.contains("CustomName", 8)) {
-            this.name = Component.Serializer.fromJson(nbt.getString("CustomName"));
+            this.name = MCUtil.getBaseComponentFromNbt("CustomName", nbt); // Paper - Catch ParseException
         }
 
     }
