From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Dreeam <61569423+Dreeam-qwq@users.noreply.github.com>
Date: Sat, 3 Feb 2024 18:45:53 -0500
Subject: [PATCH] Configurable LibraryLoader maven repos

Add JVM flag `-DLeaf.library-download-repo=link` to choose library download repo link.
e.g. `-DLeaf.library-download-repo=https://maven.aliyun.com/repository/public`

diff --git a/src/main/java/io/papermc/paper/plugin/loader/library/impl/MavenLibraryResolver.java b/src/main/java/io/papermc/paper/plugin/loader/library/impl/MavenLibraryResolver.java
index 107705db2d82b7c191e5e625ec888e0bc3b03831..d7dc6ff0b372de04c956cae6fc27d2679b88e0f7 100644
--- a/src/main/java/io/papermc/paper/plugin/loader/library/impl/MavenLibraryResolver.java
+++ b/src/main/java/io/papermc/paper/plugin/loader/library/impl/MavenLibraryResolver.java
@@ -3,9 +3,11 @@ package io.papermc.paper.plugin.loader.library.impl;
 import io.papermc.paper.plugin.loader.library.ClassPathLibrary;
 import io.papermc.paper.plugin.loader.library.LibraryLoadingException;
 import io.papermc.paper.plugin.loader.library.LibraryStore;
+
 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
+
 import org.apache.maven.repository.internal.MavenRepositorySystemUtils;
 import org.eclipse.aether.DefaultRepositorySystemSession;
 import org.eclipse.aether.RepositorySystem;
@@ -57,6 +59,13 @@ public class MavenLibraryResolver implements ClassPathLibrary {
     private final List<RemoteRepository> repositories = new ArrayList<>();
     private final List<Dependency> dependencies = new ArrayList<>();
 
+    // Leaf start - Configurable LibraryLoader maven repos
+    @org.jspecify.annotations.Nullable
+    public static final RemoteRepository MAVEN_CENTRAL_MIRROR_REPO = getCentralMirrorRepo();
+    private static final String[] MAVEN_CENTRAL_URLS = new String[]{
+    };
+    // Leaf end - Configurable LibraryLoader maven repos
+
     /**
      * Creates a new maven library resolver instance.
      * <p>
@@ -102,9 +111,24 @@ public class MavenLibraryResolver implements ClassPathLibrary {
      * repository.
      *
      * @param remoteRepository the configuration that defines the maven repository this library resolver should fetch
-     * dependencies from
+     *                         dependencies from
      */
     public void addRepository(final RemoteRepository remoteRepository) {
+        // Leaf start - Configurable LibraryLoader maven repos
+        for (String url : MAVEN_CENTRAL_URLS) {
+            if (remoteRepository.getUrl().startsWith(url)) {
+                RemoteRepository mirrorRepo = MAVEN_CENTRAL_MIRROR_REPO;
+                if (mirrorRepo != null) {
+                    this.repositories.add(mirrorRepo);
+                    return;
+                }
+                LOGGER.warn(
+                    "Use of Maven Central as a CDN is against the Maven Central Terms of Service. Use MavenLibraryResolver.MAVEN_CENTRAL_DEFAULT_MIRROR instead.",
+                    new RuntimeException("Plugin used Maven Central for library resolution")
+                );
+            }
+        }
+        // Leaf end - Configurable LibraryLoader maven repos
         this.repositories.add(remoteRepository);
     }
 
@@ -130,4 +154,15 @@ public class MavenLibraryResolver implements ClassPathLibrary {
             store.addLibrary(file.toPath());
         }
     }
+
+    // Leaf start - Configurable LibraryLoader maven repos
+    @org.jspecify.annotations.Nullable
+    private static RemoteRepository getCentralMirrorRepo() {
+        String mirrorAddr = System.getProperty("Leaf.library-download-repo");
+        if (mirrorAddr != null) {
+            new RemoteRepository.Builder("central", "default", mirrorAddr).build();
+        }
+        return null;
+    }
+    // Leaf end - Configurable LibraryLoader maven repos
 }
diff --git a/src/main/java/org/bukkit/plugin/java/LibraryLoader.java b/src/main/java/org/bukkit/plugin/java/LibraryLoader.java
index cfe41c0a67c8d729b6bd23b0cfa32db3c9db9f74..05d3b793bf9cb320774f9f488a3b78bedab6a9d4 100644
--- a/src/main/java/org/bukkit/plugin/java/LibraryLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/LibraryLoader.java
@@ -47,6 +47,8 @@ public class LibraryLoader {
     public static java.util.function.BiFunction<URL[], ClassLoader, URLClassLoader> LIBRARY_LOADER_FACTORY; // Paper - rewrite reflection in libraries
     public static java.util.function.Function<List<java.nio.file.Path>, List<java.nio.file.Path>> REMAPPER; // Paper - remap libraries
 
+    if (io.papermc.paper.plugin.loader.library.impl.MavenLibraryResolver.MAVEN_CENTRAL_MIRROR_REPO != null) return List.of(io.papermc.paper.plugin.loader.library.impl.MavenLibraryResolver.MAVEN_CENTRAL_MIRROR_REPO); // Leaf - Configurable LibraryLoader maven repos
+
     public LibraryLoader(@NotNull Logger logger) {
         this.logger = logger;