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 ccdee183f02ab55723e16f41efce55dc51e96297..162aa7718488a74980843944e0d026ccfd5a65a5 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -7,6 +7,8 @@ import it.unimi.dsi.fastutil.objects.ObjectRBTreeSet;
 import java.lang.ref.Cleaner;
 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;
@@ -524,6 +526,21 @@ 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.fromJson(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 04a3627667498b841fbff547d1874d99cc708af4..5b125aa77e769983a0aee7c5f6eb6a8a146fead0 100644
--- a/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
+++ b/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
@@ -73,7 +73,7 @@ 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(net.minecraft.server.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 8854901b439cdeddc528e02fa5f8539869556a3c..aec30b264e2e24ea101f8b3296a93293b4c9eef4 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
@@ -97,7 +97,7 @@ 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 = net.minecraft.server.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 cfd1e2fbc029d928daa2d9f12df393c8cf30e850..72c4c367b3531b21f1f28601735a5250069b8713 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
@@ -31,7 +31,7 @@ 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 = net.minecraft.server.MCUtil.getBaseComponentFromNbt("CustomName", nbt); // Paper - Catch ParseException
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java
index 76a401bcfdacded2137142ed38d739ed65d9fae6..7c8809e679670ba0e0ea7a1e193913e45b34a97a 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java
@@ -360,7 +360,7 @@ public class BeaconBlockEntity extends BlockEntity implements MenuProvider {
         this.levels = nbt.getInt("Levels"); // SPIGOT-5053, use where available
         // CraftBukkit end
         if (nbt.contains("CustomName", 8)) {
-            this.name = Component.Serializer.fromJson(nbt.getString("CustomName"));
+            this.name = net.minecraft.server.MCUtil.getBaseComponentFromNbt("CustomName", nbt); // Paper - Catch ParseException
         }
 
         this.lockKey = LockCode.fromTag(nbt);
diff --git a/src/main/java/net/minecraft/world/level/block/entity/EnchantmentTableBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/EnchantmentTableBlockEntity.java
index b03621ebd0a94ab2dceb9006aee43fd5320094e3..424ad38b5522d9b76aa1bf726a9fe2c1e934598d 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/EnchantmentTableBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/EnchantmentTableBlockEntity.java
@@ -43,7 +43,7 @@ public class EnchantmentTableBlockEntity 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 = net.minecraft.server.MCUtil.getBaseComponentFromNbt("CustomName", nbt); // Paper - Catch ParseException
         }
 
     }
