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 ebb52c2c8d5fe8ca25513aadae8168180a3d426e..006a86da6afa1b7b80df5df073ebd236e27cd2b5 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
@@ -60,12 +60,16 @@ public class MavenLibraryResolver implements ClassPathLibrary {
      * <p>This repository is also used by the legacy {@link org.bukkit.plugin.java.LibraryLoader}.</p>
      */
     public static final String MAVEN_CENTRAL_DEFAULT_MIRROR = getDefaultMavenCentralMirror();
-    private static final List<String> MAVEN_CENTRAL_URLS = List.of(
+    // 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[]{
         "https://repo1.maven.org/maven2",
         "http://repo1.maven.org/maven2",
         "https://repo.maven.apache.org/maven2",
         "http://repo.maven.apache.org/maven2"
-    );
+    };
+    // Leaf end - Configurable LibraryLoader maven repos
     // Paper end - Avoid and discourage use of Maven Central as a CDN
 
     private static final Logger LOGGER = LoggerFactory.getLogger("MavenLibraryResolver");
@@ -124,12 +128,21 @@ public class MavenLibraryResolver implements ClassPathLibrary {
      */
     public void addRepository(final RemoteRepository remoteRepository) {
         // Paper start - Avoid and discourage use of Maven Central as a CDN
-        if (MAVEN_CENTRAL_URLS.stream().anyMatch(remoteRepository.getUrl()::startsWith)) {
-            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 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
         // Paper end - Avoid and discourage use of Maven Central as a CDN
         this.repositories.add(remoteRepository);
     }
@@ -169,4 +182,15 @@ public class MavenLibraryResolver implements ClassPathLibrary {
         return central;
     }
     // Paper end - Avoid and discourage use of Maven Central as a CDN
+
+    // 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 1f2e86e9a830b990bbba3704889671465816ea1c..a16da10e38889af3a5878a6273d2982c707e93d2 100644
--- a/src/main/java/org/bukkit/plugin/java/LibraryLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/LibraryLoader.java
@@ -49,6 +49,7 @@ public class LibraryLoader {
 
     // Paper start - Avoid and discourage use of Maven Central as a CDN
     private static List<RemoteRepository> getRepositories() {
+        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
         return List.of(new RemoteRepository.Builder("central", "default", io.papermc.paper.plugin.loader.library.impl.MavenLibraryResolver.MAVEN_CENTRAL_DEFAULT_MIRROR).build());
     }
     // Paper end - Avoid and discourage use of Maven Central as a CDN