From 4be55289f11432ae8f1525e88839e5c5732836db 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/CommandBlockListenerAbstract.java b/src/main/java/net/minecraft/server/CommandBlockListenerAbstract.java
index 7867122974..ef2a496eda 100644
--- a/src/main/java/net/minecraft/server/CommandBlockListenerAbstract.java
+++ b/src/main/java/net/minecraft/server/CommandBlockListenerAbstract.java
@@ -59,7 +59,7 @@ public abstract class CommandBlockListenerAbstract implements ICommandListener {
         this.command = nbttagcompound.getString("Command");
         this.successCount = nbttagcompound.getInt("SuccessCount");
         if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-            this.setName(IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName")));
+            this.setName(MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound)); // Paper - Catch ParseException
         }
 
         if (nbttagcompound.hasKeyOfType("TrackOutput", 1)) {
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index e8b70a5ca5..9a23380600 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -1679,7 +1679,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
                     this.Z();
                     this.setYawPitch(this.yaw, this.pitch);
                     if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-                        this.setCustomName(IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName")));
+                        this.setCustomName(MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound)); // Paper - Catch ParseException
                     }
 
                     this.setCustomNameVisible(nbttagcompound.getBoolean("CustomNameVisible"));
diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
index 2a22bc6f3e..3a482466ec 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -409,4 +409,19 @@ public final class MCUtil {
                 return null;
         }
     }
+
+    @Nullable
+    public static IChatBaseComponent getBaseComponentFromNbt(String key, NBTTagCompound compound) {
+        if (!compound.hasKey(key)) {
+            return null;
+        }
+        String string = compound.getString(key);
+        try {
+            return IChatBaseComponent.ChatSerializer.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/server/TileEntityBanner.java b/src/main/java/net/minecraft/server/TileEntityBanner.java
index 93911a8251..d35604edb2 100644
--- a/src/main/java/net/minecraft/server/TileEntityBanner.java
+++ b/src/main/java/net/minecraft/server/TileEntityBanner.java
@@ -60,7 +60,7 @@ public class TileEntityBanner extends TileEntity implements INamableTileEntity {
     public void load(NBTTagCompound nbttagcompound) {
         super.load(nbttagcompound);
         if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-            this.a = IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName"));
+            this.a = MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound); // Paper - Catch ParseException
         }
 
         if (this.hasWorld()) {
diff --git a/src/main/java/net/minecraft/server/TileEntityContainer.java b/src/main/java/net/minecraft/server/TileEntityContainer.java
index 473ec2cbde..ab6b86e4e9 100644
--- a/src/main/java/net/minecraft/server/TileEntityContainer.java
+++ b/src/main/java/net/minecraft/server/TileEntityContainer.java
@@ -17,7 +17,7 @@ public abstract class TileEntityContainer extends TileEntity implements IInvento
         super.load(nbttagcompound);
         this.chestLock = ChestLock.b(nbttagcompound);
         if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-            this.customName = IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName"));
+            this.customName = MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound); // Paper - Catch ParseException
         }
 
     }
-- 
2.25.0