Scissors/patches/server/0002-UUID-validation.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Telesphoreo <me@telesphoreo.me>
Date: Sun, 24 Sep 2023 15:09:27 -0500
Subject: [PATCH] UUID validation


diff --git a/src/main/java/net/minecraft/nbt/NbtUtils.java b/src/main/java/net/minecraft/nbt/NbtUtils.java
index b65dcff9812dbc3256c080ac264c4aafd83ce276..82b53a7bfb37bfa1752a016a8a454c0b994b9108 100644
--- a/src/main/java/net/minecraft/nbt/NbtUtils.java
+++ b/src/main/java/net/minecraft/nbt/NbtUtils.java
@@ -74,7 +74,11 @@ public final class NbtUtils {
         UUID uUID = nbt.hasUUID("Id") ? nbt.getUUID("Id") : Util.NIL_UUID;
         // Paper start - support string UUID's
         if (nbt.contains("Id", Tag.TAG_STRING)) {
-            uUID = UUID.fromString(nbt.getString("Id"));
+            // Scissors start - Validate String UUIDs in game profiles
+            try {
+                uUID = UUID.fromString(nbt.getString("Id"));
+            } catch (Exception ignored) {}
+            // Scissors end
         }
         // Paper end
         String string = nbt.getString("Name");
diff --git a/src/main/java/net/minecraft/network/chat/HoverEvent.java b/src/main/java/net/minecraft/network/chat/HoverEvent.java
index 3ad05bbab726c59e7b67d9614af4b208d4520cb3..c0633f9553fb5aa52e8ffc863159521d09cb3bd5 100644
--- a/src/main/java/net/minecraft/network/chat/HoverEvent.java
+++ b/src/main/java/net/minecraft/network/chat/HoverEvent.java
@@ -174,7 +174,14 @@ public class HoverEvent {
             } else {
                 JsonObject jsonObject = json.getAsJsonObject();
                 EntityType<?> entityType = BuiltInRegistries.ENTITY_TYPE.get(new ResourceLocation(GsonHelper.getAsString(jsonObject, "type")));
-                UUID uUID = UUID.fromString(GsonHelper.getAsString(jsonObject, "id"));
+                // Scissors start
+                UUID uUID;
+                try {
+                    uUID = UUID.fromString(GsonHelper.getAsString(jsonObject, "id"));
+                } catch (Exception ex) {
+                    return null;
+                }
+                // Scissors end
                 Component component = Component.Serializer.fromJson(jsonObject.get("name"));
                 return new HoverEvent.EntityTooltipInfo(entityType, uUID, component);
             }
@@ -186,7 +193,14 @@ public class HoverEvent {
                 CompoundTag compoundTag = TagParser.parseTag(text.getString());
                 Component component = Component.Serializer.fromJson(compoundTag.getString("name"));
                 EntityType<?> entityType = BuiltInRegistries.ENTITY_TYPE.get(new ResourceLocation(compoundTag.getString("type")));
-                UUID uUID = UUID.fromString(compoundTag.getString("id"));
+                // Scissors start
+                UUID uUID;
+                try {
+                    uUID = UUID.fromString(compoundTag.getString("id"));
+                } catch (Exception ex) {
+                    return null;
+                }
+                // Scissors end
                 return new HoverEvent.EntityTooltipInfo(entityType, uUID, component);
             } catch (Exception var5) {
                 return null;