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 a0728e95251e8110bcecd00512c7a266fe120794..da504702bc9423774b35dff792d2dbe7fc270fe3 100644
--- a/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
+++ b/src/main/java/net/minecraft/world/level/BaseCommandBlock.java
@@ -72,7 +72,7 @@ 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 601cf7b9aa4b3483a2134a2db0d617ed8938ea48..c6ce5dc5dafc15f1f12b0ea4c9d55325f6a76529 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
@@ -98,7 +98,7 @@ 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 a34ae15cd4048bda965fd1449c75f3bd8f0e530b..adf67868eef7d578b7858a5afd54e37ea0d5102f 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
@@ -30,7 +30,7 @@ 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 0c699c08ef85ca3339ada5c869b571581092a11d..349b89dd4d34b92d1077ddadb30c36642fd85622 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
@@ -365,7 +365,7 @@ 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 3a8bdb788b07b0a8cda3d4b872ede52ca9a005c4..2341a5a249d455628165fc6ba508fc6d70c3dbfb 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
@@ -42,7 +42,7 @@ 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
         }
 
     }