From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Encode42 <me@encode42.dev>
Date: Wed, 24 Mar 2021 17:59:54 -0400
Subject: [PATCH] Config to allow for unsafe enchants


diff --git a/src/main/java/net/minecraft/server/commands/EnchantCommand.java b/src/main/java/net/minecraft/server/commands/EnchantCommand.java
index 7c012f1e37b0085c0939797b0dae8996b4953ab8..155b0a1aa58b891e98a55e10f112f611ff0b35c5 100644
--- a/src/main/java/net/minecraft/server/commands/EnchantCommand.java
+++ b/src/main/java/net/minecraft/server/commands/EnchantCommand.java
@@ -44,7 +44,7 @@ public class EnchantCommand {
     }
 
     private static int enchant(CommandSourceStack source, Collection<? extends Entity> targets, Enchantment enchantment, int level) throws CommandSyntaxException {
-        if (level > enchantment.getMaxLevel()) {
+        if (!org.purpurmc.purpur.PurpurConfig.allowUnsafeEnchantCommand && level > enchantment.getMaxLevel()) { // Purpur
             throw ERROR_LEVEL_TOO_HIGH.create(level, enchantment.getMaxLevel());
         } else {
             int i = 0;
@@ -54,7 +54,7 @@ public class EnchantCommand {
                     LivingEntity livingEntity = (LivingEntity)entity;
                     ItemStack itemStack = livingEntity.getMainHandItem();
                     if (!itemStack.isEmpty()) {
-                        if (enchantment.canEnchant(itemStack) && EnchantmentHelper.isEnchantmentCompatible(EnchantmentHelper.getEnchantments(itemStack).keySet(), enchantment)) {
+                        if ((enchantment.canEnchant(itemStack) && EnchantmentHelper.isEnchantmentCompatible(EnchantmentHelper.getEnchantments(itemStack).keySet(), enchantment)) || (org.purpurmc.purpur.PurpurConfig.allowUnsafeEnchantCommand && !itemStack.hasEnchantment(enchantment))) { // Purpur
                             itemStack.enchant(enchantment, level);
                             ++i;
                         } else if (targets.size() == 1) {
diff --git a/src/main/java/net/minecraft/world/inventory/AnvilMenu.java b/src/main/java/net/minecraft/world/inventory/AnvilMenu.java
index 92efc8caf43661b24e95653f7a43bc4cfa0f4110..ad76e9608c8941fe45469c39e80851d1bef1db54 100644
--- a/src/main/java/net/minecraft/world/inventory/AnvilMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AnvilMenu.java
@@ -209,7 +209,8 @@ public class AnvilMenu extends ItemCombinerMenu {
                             int i2 = (Integer) map1.get(enchantment);
 
                             i2 = l1 == i2 ? i2 + 1 : Math.max(i2, l1);
-                            boolean flag3 = canDoUnsafeEnchants || enchantment.canEnchant(itemstack); // Purpur
+                            boolean flag3 = canDoUnsafeEnchants || (org.purpurmc.purpur.PurpurConfig.allowUnsafeEnchants && org.purpurmc.purpur.PurpurConfig.allowInapplicableEnchants) || enchantment.canEnchant(itemstack); // Purpur
+                            boolean flag4 = true; // Purpur
 
                             if (this.player.getAbilities().instabuild || itemstack.is(Items.ENCHANTED_BOOK)) {
                                 flag3 = true;
@@ -221,16 +222,16 @@ public class AnvilMenu extends ItemCombinerMenu {
                                 Enchantment enchantment1 = (Enchantment) iterator1.next();
 
                                 if (enchantment1 != enchantment && !enchantment.isCompatibleWith(enchantment1)) {
-                                    flag3 = canDoUnsafeEnchants; // Purpur
+                                    flag4 = canDoUnsafeEnchants || (org.purpurmc.purpur.PurpurConfig.allowUnsafeEnchants && org.purpurmc.purpur.PurpurConfig.allowIncompatibleEnchants); // Purpur flag3 -> flag4
                                     ++i;
                                 }
                             }
 
-                            if (!flag3) {
+                            if (!flag3 || !flag4) { // Purpur
                                 flag2 = true;
                             } else {
                                 flag1 = true;
-                                if (i2 > enchantment.getMaxLevel()) {
+                                if ((!org.purpurmc.purpur.PurpurConfig.allowUnsafeEnchants || !org.purpurmc.purpur.PurpurConfig.allowHigherEnchantsLevels) && i2 > enchantment.getMaxLevel()) { // Purpur
                                     i2 = enchantment.getMaxLevel();
                                 }
 
@@ -352,7 +353,7 @@ public class AnvilMenu extends ItemCombinerMenu {
             sendAllDataToRemote(); // CraftBukkit - SPIGOT-6686: Always send completed inventory to stay in sync with client
             this.broadcastChanges();
             // Purpur start
-            if (canDoUnsafeEnchants && itemstack1 != ItemStack.EMPTY) {
+            if ((canDoUnsafeEnchants || org.purpurmc.purpur.PurpurConfig.allowUnsafeEnchants) && itemstack1 != ItemStack.EMPTY) {
                 ((ServerPlayer) player).connection.send(new ClientboundContainerSetSlotPacket(containerId, incrementStateId(), 2, itemstack1));
                 ((ServerPlayer) player).connection.send(new ClientboundContainerSetDataPacket(containerId, 0, cost.get()));
             }
diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index 2b2115d218a279245f8be5e0c93a2b6200f81241..f7017c330ee2d8e17ab2be294865d7e3fd796456 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -1153,6 +1153,12 @@ public final class ItemStack {
         return this.tag != null && this.tag.contains("Enchantments", 9) ? !this.tag.getList("Enchantments", 10).isEmpty() : false;
     }
 
+    // Purpur start
+    public boolean hasEnchantment(Enchantment enchantment) {
+        return isEnchanted() && EnchantmentHelper.deserializeEnchantments(getEnchantmentTags()).containsKey(enchantment);
+    }
+    // Purpur end
+
     public void addTagElement(String key, Tag element) {
         this.getOrCreateTag().put(key, element);
     }
diff --git a/src/main/java/org/purpurmc/purpur/PurpurConfig.java b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
index 1659f76cfffab544b91cd1e6237047873ccfe256..09198dd9db8f39fadf95d58fddb70a9104b79e6c 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
@@ -283,14 +283,32 @@ public class PurpurConfig {
 
     public static boolean allowInfinityMending = false;
     public static boolean allowCrossbowInfinity = false;
+    public static boolean allowUnsafeEnchants = false;
+    public static boolean allowInapplicableEnchants = true;
+    public static boolean allowIncompatibleEnchants = true;
+    public static boolean allowHigherEnchantsLevels = true;
+    public static boolean allowUnsafeEnchantCommand = false;
     private static void enchantmentSettings() {
         if (version < 5) {
             boolean oldValue = getBoolean("settings.enchantment.allow-infinite-and-mending-together", false);
             set("settings.enchantment.allow-infinity-and-mending-together", oldValue);
             set("settings.enchantment.allow-infinite-and-mending-together", null);
         }
+        if (version < 30) {
+            boolean oldValue = getBoolean("settings.enchantment.allow-unsafe-enchants", false);
+            set("settings.enchantment.anvil.allow-unsafe-enchants", oldValue);
+            set("settings.enchantment.anvil.allow-inapplicable-enchants", true);
+            set("settings.enchantment.anvil.allow-incompatible-enchants", true);
+            set("settings.enchantment.anvil.allow-higher-enchants-levels", true);
+            set("settings.enchantment.allow-unsafe-enchants", null);
+        }
         allowInfinityMending = getBoolean("settings.enchantment.allow-infinity-and-mending-together", allowInfinityMending);
         allowCrossbowInfinity = getBoolean("settings.enchantment.allow-infinity-on-crossbow", allowCrossbowInfinity);
+        allowUnsafeEnchants = getBoolean("settings.enchantment.anvil.allow-unsafe-enchants", allowUnsafeEnchants);
+        allowInapplicableEnchants = getBoolean("settings.enchantment.anvil.allow-inapplicable-enchants", allowInapplicableEnchants);
+        allowIncompatibleEnchants = getBoolean("settings.enchantment.anvil.allow-incompatible-enchants", allowIncompatibleEnchants);
+        allowHigherEnchantsLevels = getBoolean("settings.enchantment.anvil.allow-higher-enchants-levels", allowHigherEnchantsLevels);
+        allowUnsafeEnchantCommand = getBoolean("settings.enchantment.allow-unsafe-enchant-command", allowUnsafeEnchants); // allowUnsafeEnchants as default for backwards compatability
     }
 
     public static boolean endermanShortHeight = false;