From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Wed, 25 Aug 2021 13:19:53 -0700
Subject: [PATCH] Vanilla command permission fixes

Fixes permission checks for vanilla commands which don't have a
requirement, as well as for namespaced vanilla commands.

== AT ==
public-f com.mojang.brigadier.tree.CommandNode requirement

diff --git a/src/main/java/com/mojang/brigadier/builder/ArgumentBuilder.java b/src/main/java/com/mojang/brigadier/builder/ArgumentBuilder.java
index 899008b2980d13f1be6280cd8cb959c53a29bebf..d5f7da3502575f6847f3c22ab0e942848a7c6031 100644
--- a/src/main/java/com/mojang/brigadier/builder/ArgumentBuilder.java
+++ b/src/main/java/com/mojang/brigadier/builder/ArgumentBuilder.java
@@ -14,9 +14,17 @@ import java.util.Collections;
 import java.util.function.Predicate;
 
 public abstract class ArgumentBuilder<S, T extends ArgumentBuilder<S, T>> {
+    // Paper start - Vanilla command permission fixes
+    private static final Predicate<Object> DEFAULT_REQUIREMENT = s -> true;
+
+    @SuppressWarnings("unchecked")
+    public static <S> Predicate<S> defaultRequirement() {
+        return (Predicate<S>) DEFAULT_REQUIREMENT;
+    }
+    // Paper end - Vanilla command permission fixes
     private final RootCommandNode<S> arguments = new RootCommandNode<>();
     private Command<S> command;
-    private Predicate<S> requirement = s -> true;
+    private Predicate<S> requirement = defaultRequirement(); // Paper - Vanilla command permission fixes
     private CommandNode<S> target;
     private RedirectModifier<S> modifier = null;
     private boolean forks;
diff --git a/src/main/java/net/minecraft/commands/Commands.java b/src/main/java/net/minecraft/commands/Commands.java
index d602c713696e23ba6a2d542b2e9e2cce46d79a66..800d1756db8c27b7d129a90addc125c4fc81e134 100644
--- a/src/main/java/net/minecraft/commands/Commands.java
+++ b/src/main/java/net/minecraft/commands/Commands.java
@@ -261,6 +261,13 @@ public class Commands {
             PublishCommand.register(this.dispatcher);
         }
 
+        // Paper start - Vanilla command permission fixes
+        for (final CommandNode<CommandSourceStack> node : this.dispatcher.getRoot().getChildren()) {
+            if (node.getRequirement() == com.mojang.brigadier.builder.ArgumentBuilder.<CommandSourceStack>defaultRequirement()) {
+                node.requirement = stack -> stack.source == CommandSource.NULL || stack.getBukkitSender().hasPermission(org.bukkit.craftbukkit.command.VanillaCommandWrapper.getPermission(node));
+            }
+        }
+        // Paper end - Vanilla command permission fixes
         // CraftBukkit start
     }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java b/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java
index 9b453830e4b949d67c2a01adc309ddc6ad019be1..35b05f9321ddbbbdf62f4bf726b58cf1205f0cfb 100644
--- a/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java
+++ b/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java
@@ -91,7 +91,21 @@ public final class VanillaCommandWrapper extends BukkitCommand {
     }
 
     public static String getPermission(CommandNode<CommandSourceStack> vanillaCommand) {
-        return "minecraft.command." + ((vanillaCommand.getRedirect() == null) ? vanillaCommand.getName() : vanillaCommand.getRedirect().getName());
+        // Paper start - Vanilla command permission fixes
+        while (vanillaCommand.getRedirect() != null) {
+            vanillaCommand = vanillaCommand.getRedirect();
+        }
+        final String commandName = vanillaCommand.getName();
+        return "minecraft.command." + stripDefaultNamespace(commandName);
+    }
+
+    private static String stripDefaultNamespace(final String maybeNamespaced) {
+        final String prefix = "minecraft:";
+        if (maybeNamespaced.startsWith(prefix)) {
+            return maybeNamespaced.substring(prefix.length());
+        }
+        return maybeNamespaced;
+        // Paper end - Vanilla command permission fixes
     }
 
     private String toDispatcher(String[] args, String name) {