From d1f5b09fd5fdf02c801d861b9934e2c8f554034c Mon Sep 17 00:00:00 2001
From: Rhea <napkinorton@gmail.com>
Date: Thu, 4 Dec 2025 16:17:29 -0500
Subject: [PATCH] packager: block use of net.runelite namespace

---
 .../runelite/pluginhub/packager/Plugin.java   |  6 +++++
 .../pluginhub/packager/PluginTest.java        | 27 ++++++++++++++++++-
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/package/package/src/main/java/net/runelite/pluginhub/packager/Plugin.java b/package/package/src/main/java/net/runelite/pluginhub/packager/Plugin.java
index 8893a8a99..29c2c3745 100644
--- a/package/package/src/main/java/net/runelite/pluginhub/packager/Plugin.java
+++ b/package/package/src/main/java/net/runelite/pluginhub/packager/Plugin.java
@@ -714,6 +714,12 @@ public class Plugin implements Closeable
 										.withFile(fileName);
 								}
 
+								if (name != null && name.startsWith("net/runelite/"))
+								{
+									throw PluginBuildException.of(Plugin.this, "use of net.runelite package namespace is not allowed")
+										.withFile(fileName);
+								}
+
 								jarClasses.add(name.replace('/', '.'));
 
 								extendsPlugin = "net/runelite/client/plugins/Plugin".equals(superName);
diff --git a/package/package/src/test/java/net/runelite/pluginhub/packager/PluginTest.java b/package/package/src/test/java/net/runelite/pluginhub/packager/PluginTest.java
index 0661099c4..feb17a431 100644
--- a/package/package/src/test/java/net/runelite/pluginhub/packager/PluginTest.java
+++ b/package/package/src/test/java/net/runelite/pluginhub/packager/PluginTest.java
@@ -136,6 +136,31 @@ public class PluginTest
 		}
 	}
 
+	@Test
+	public void testNetRuneLitePackage() throws InterruptedException, DisabledPluginException, PluginBuildException, IOException
+	{
+		try (Plugin p = createExamplePlugin("net-runelite-package"))
+		{
+			File pluginClassFile = new File(p.repositoryDirectory, "src/main/java/com/example/TestExamplePlugin.java");
+			String pluginClassSrc = Files.asCharSource(pluginClassFile, StandardCharsets.UTF_8).read();
+			pluginClassSrc = pluginClassSrc.replace("package com.example;", "package net.runelite;");
+			Files.asCharSink(pluginClassFile, StandardCharsets.UTF_8).write(pluginClassSrc);
+
+			File configClassFile = new File(p.repositoryDirectory, "src/main/java/com/example/TestExampleConfig.java");
+			String configClassSrc = Files.asCharSource(configClassFile, StandardCharsets.UTF_8).read();
+			configClassSrc = configClassSrc.replace("package com.example;", "package net.runelite;");
+			Files.asCharSink(configClassFile, StandardCharsets.UTF_8).write(configClassSrc);
+
+			p.build(Util.readRLVersion(), true);
+			Assert.fail();
+		}
+		catch (PluginBuildException e)
+		{
+			assertContains(e.getMessage(), "use of net.runelite package namespace is not allowed");
+			log.info("ok: ", e);
+		}
+	}
+
 	private static void writeProperties(Properties props, File fi) throws IOException
 	{
 		try (FileOutputStream fos = new FileOutputStream(fi))
@@ -191,4 +216,4 @@ public class PluginTest
 	{
 		Assert.assertTrue(haystack, haystack.contains(needle));
 	}
-}
\ No newline at end of file
+}