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 f12c25f35f3d26dc69e05c7965385e66a3d3d545..768b60e13435dc8eca6fc343081a663a37a6d0e7 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 +60,25 @@ 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 CUSTOM_MAVEN_CENTRAL_MIRROR_REPO = getCustomCentralMirrorRepo();
+    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"
-    );
+    };
+    // From https://storage-download.googleapis.com/maven-central/index.html
+    private static final String[] MAVEN_CENTRAL_GOOGLE_MIRROR_URLS = new String[]{
+        "https://maven-central.storage-download.googleapis.com/maven2",
+        "http://maven-central.storage-download.googleapis.com/maven2",
+        "https://maven-central-eu.storage-download.googleapis.com/maven2",
+        "http://maven-central-eu.storage-download.googleapis.com/maven2",
+        "https://maven-central-asia.storage-download.googleapis.com/maven2",
+        "http://maven-central-asia.storage-download.googleapis.com/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");
@@ -124,13 +137,32 @@ 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)) {
-            try {
-                throw new RuntimeException("Plugin used Maven Central for library resolution");
-            } catch (RuntimeException e) {
-                LOGGER.error("Use of Maven Central as a CDN is against the Maven Central Terms of Service. Use MavenLibraryResolver.MAVEN_CENTRAL_DEFAULT_MIRROR instead.", e);
+        // Leaf start - Configurable LibraryLoader maven repos
+         for (String url : MAVEN_CENTRAL_URLS) {
+             if (remoteRepository.getUrl().startsWith(url)) {
+                 RemoteRepository mirrorRepo = CUSTOM_MAVEN_CENTRAL_MIRROR_REPO;
+                 if (mirrorRepo != null) {
+                     this.repositories.add(mirrorRepo);
+                     return;
+                 }
+                 try {
+                     throw new RuntimeException("Plugin used Maven Central for library resolution");
+                 } catch (RuntimeException e) {
+                     LOGGER.error("Use of Maven Central as a CDN is against the Maven Central Terms of Service. Use MavenLibraryResolver.MAVEN_CENTRAL_DEFAULT_MIRROR instead.", e);
+                 }
+             }
+        }
+         // Match google api maven central mirror urls
+        for (String url : MAVEN_CENTRAL_GOOGLE_MIRROR_URLS) {
+            if (remoteRepository.getUrl().startsWith(url)) {
+                RemoteRepository mirrorRepo = CUSTOM_MAVEN_CENTRAL_MIRROR_REPO;
+                if (mirrorRepo != null) {
+                    this.repositories.add(mirrorRepo);
+                    return;
+                }
             }
         }
+        // Leaf end - Configurable LibraryLoader maven repos
         // Paper end - Avoid and discourage use of Maven Central as a CDN
         this.repositories.add(remoteRepository);
     }
@@ -170,4 +202,15 @@ 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 getCustomCentralMirrorRepo() {
+        String mirrorAddr = System.getProperty("Leaf.library-download-repo");
+        if (mirrorAddr != null) {
+            return 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 998a5278f39d13ed6b0a6d03514658f28b0d420f..330553fe8e6e4f23681df98d2519f10ebb0cfe5d 100644
--- a/src/main/java/org/bukkit/plugin/java/LibraryLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/LibraryLoader.java
@@ -51,6 +51,7 @@ 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.CUSTOM_MAVEN_CENTRAL_MIRROR_REPO != null) return List.of(io.papermc.paper.plugin.loader.library.impl.MavenLibraryResolver.CUSTOM_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