From 8b789e0f300991bd424b7e1daa4bda7d01080e46 Mon Sep 17 00:00:00 2001
From: Kieran Wallbanks <kieran.wallbanks@gmail.com>
Date: Wed, 6 Jul 2022 15:34:40 +0100
Subject: [PATCH] Allow changing the extensions folder via a system property

---
 .../server/extensions/ExtensionManager.java        |  3 ++-
 .../net/minestom/server/utils/PropertyUtils.java   | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/main/java/net/minestom/server/extensions/ExtensionManager.java b/src/main/java/net/minestom/server/extensions/ExtensionManager.java
index b703ad6de..7c92fd60a 100644
--- a/src/main/java/net/minestom/server/extensions/ExtensionManager.java
+++ b/src/main/java/net/minestom/server/extensions/ExtensionManager.java
@@ -7,6 +7,7 @@ import net.minestom.dependencies.maven.MavenRepository;
 import net.minestom.server.ServerProcess;
 import net.minestom.server.event.Event;
 import net.minestom.server.event.EventNode;
+import net.minestom.server.utils.PropertyUtils;
 import net.minestom.server.utils.validate.Check;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
@@ -39,7 +40,7 @@ public class ExtensionManager {
     private final Map<String, Extension> extensions = new LinkedHashMap<>();
     private final Map<String, Extension> immutableExtensions = Collections.unmodifiableMap(extensions);
 
-    private final File extensionFolder = new File("extensions");
+    private final File extensionFolder = new File(PropertyUtils.getString("minestom.extension.folder", "extensions"));
     private final File dependenciesFolder = new File(extensionFolder, ".libs");
     private Path extensionDataRoot = extensionFolder.toPath();
 
diff --git a/src/main/java/net/minestom/server/utils/PropertyUtils.java b/src/main/java/net/minestom/server/utils/PropertyUtils.java
index aef386e44..ec7c15e9b 100644
--- a/src/main/java/net/minestom/server/utils/PropertyUtils.java
+++ b/src/main/java/net/minestom/server/utils/PropertyUtils.java
@@ -1,6 +1,9 @@
 package net.minestom.server.utils;
 
 import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 @ApiStatus.Internal
 public final class PropertyUtils {
@@ -15,4 +18,15 @@ public final class PropertyUtils {
         }
         return result;
     }
+
+    @Contract("_, null -> null; _, !null -> !null")
+    public static String getString(@NotNull String name, @Nullable String defaultValue) {
+        final String value = System.getProperty(name);
+
+        if (value == null) {
+            return defaultValue;
+        } else {
+            return value;
+        }
+    }
 }