PaperMC/patches/server-remapped/0291-Catch-JsonParseException-in-Entity-and-TE-names.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.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 68c3f069f8f832ab3d146748348aded69b5ad823..1fecc81b25109592907623741225a6222a8c5ccc 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -7,6 +7,8 @@ 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;
@@ -514,4 +516,19 @@ public final class MCUtil {
                 return null;
         }
     }
+
+    @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;
+    }
 }
diff --git a/src/main/java/net/minecraft/world/level/BaseCommandBlock.java b/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
index 9ad077259563a3d960d32a59d4b6fc3cfbe3440c..00dc4cd436023b946d7005f17a7ba983a4bbdfb6 100644
--- a/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
+++ b/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
@@ -12,6 +12,7 @@ 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;
@@ -72,7 +73,7 @@ public abstract class BaseCommandBlock implements CommandSource {
         this.command = tag.getString("Command");
         this.successCount = tag.getInt("SuccessCount");
         if (tag.contains("CustomName", 8)) {
-            this.setName(Component.Serializer.fromJson(tag.getString("CustomName")));
+            this.setName(MCUtil.getBaseComponentFromNbt("CustomName", tag)); // Paper - Catch ParseException
         }
 
         if (tag.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 2e3ec85e7bd1c375db0662dba2617d8924dbd2a6..2c885be67b9c992b96f5caf78130d46abb455ceb 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
@@ -9,6 +9,7 @@ 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;
@@ -70,7 +71,7 @@ public class BannerBlockEntity extends BlockEntity implements Nameable {
     public void load(BlockState state, CompoundTag tag) {
         super.load(state, tag);
         if (tag.contains("CustomName", 8)) {
-            this.name = Component.Serializer.fromJson(tag.getString("CustomName"));
+            this.name = MCUtil.getBaseComponentFromNbt("CustomName", tag); // Paper - Catch ParseException
         }
 
         if (this.hasLevel()) {
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 a7358274fe367a113b304a5ce332b8dcf721b7af..2b420109e9bed184aaa4ffbcee666b4c325c5a28 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
@@ -4,6 +4,7 @@ import javax.annotation.Nullable;
 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;
@@ -30,7 +31,7 @@ public abstract class BaseContainerBlockEntity extends BlockEntity implements Co
         super.load(state, tag);
         this.lockKey = LockCode.fromTag(tag);
         if (tag.contains("CustomName", 8)) {
-            this.name = Component.Serializer.fromJson(tag.getString("CustomName"));
+            this.name = MCUtil.getBaseComponentFromNbt("CustomName", tag); // Paper - Catch ParseException
         }
 
     }