feat: Support download from mirrors

src/main/java/i18nupdatemod/core/I18nConfig.java

@@ -11,9 +11,15 @@
 
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
 import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 
+import static i18nupdatemod.util.AssetUtil.getFastestUrl;
+import static i18nupdatemod.util.AssetUtil.getGitIndex;
+
 public class I18nConfig {
     /**
      * <a href="https://github.com/CFPAOrg/Minecraft-Mod-Language-Package">CFPAOrg/Minecraft-Mod-Language-Package</a>
@@ -58,17 +64,60 @@ public static GameAssetDetail getAssetDetail(String minecraftVersion, String loa
         GameMetaData convert = getGameMetaData(minecraftVersion);
         GameAssetDetail ret = new GameAssetDetail();
 
-        ret.downloads = convert.convertFrom.stream().map(it -> getAssetMetaData(it, loader)).map(it -> {
+        String asset_root = getFastestUrl();
+        Log.debug("Using asset root: " + asset_root);
+
+        if (asset_root.contains("github")) {
+            ret.downloads = createDownloadDetailsFromGit(convert, loader);
+        } else {
+            ret.downloads = createDownloadDetails(convert, loader, asset_root);
+        }
+
+        ret.covertPackFormat = convert.packFormat;
+        ret.covertFileName =
+                String.format("Minecraft-Mod-Language-Modpack-Converted-%s.zip", minecraftVersion);
+        return ret;
+    }
+
+    private static List<GameAssetDetail.AssetDownloadDetail> createDownloadDetails(GameMetaData convert, String loader, String asset_root) {
+        return convert.convertFrom.stream().map(it -> getAssetMetaData(it, loader)).map(it -> {
             GameAssetDetail.AssetDownloadDetail adi = new GameAssetDetail.AssetDownloadDetail();
             adi.fileName = it.filename;
-            adi.fileUrl = CFPA_ASSET_ROOT + it.filename;
-            adi.md5Url = CFPA_ASSET_ROOT + it.md5Filename;
+            adi.fileUrl = asset_root + it.filename;
+            adi.md5Url = asset_root + it.md5Filename;
             adi.targetVersion = it.targetVersion;
             return adi;
         }).collect(Collectors.toList());
-        ret.covertPackFormat = convert.packFormat;
-        ret.covertFileName =
-                String.format("Minecraft-Mod-Language-Modpack-Converted-%s.zip", minecraftVersion);
-        return ret;
+    }
+
+    private static List<GameAssetDetail.AssetDownloadDetail> createDownloadDetailsFromGit(GameMetaData convert, String loader) {
+        try {
+            Map<String, String> index = getGitIndex();
+            String releaseTag;
+            String version = convert.gameVersions.substring(1,5);
+
+            if(loader.toLowerCase().contains("fabric")){
+                releaseTag = index.get(version + "-fabric");
+            }else{
+                releaseTag = index.get(version);
+            }
+            if (releaseTag == null) {
+                Log.debug("Error getting index: " + version + "-" + loader);
+                Log.debug(index.toString());
+                throw new Exception();
+            }
+            String asset_root = "https://github.com/CFPAOrg/Minecraft-Mod-Language-Package/releases/download/" + releaseTag + "/";
+
+            return convert.convertFrom.stream().map(it -> getAssetMetaData(it, loader)).map(it -> {
+                GameAssetDetail.AssetDownloadDetail adi = new GameAssetDetail.AssetDownloadDetail();
+                adi.fileName = it.filename;
+                adi.fileUrl = (asset_root + it.filename).replace("Minecraft-Mod-Language-Modpack-1-","Minecraft-Mod-Language-Package-1.");
+                adi.md5Url = asset_root + it.md5Filename;
+                adi.targetVersion = it.targetVersion;
+                return adi;
+            }).collect(Collectors.toList());
+        } catch (Exception ignore) {
+            return createDownloadDetails(convert, loader, CFPA_ASSET_ROOT);
+        }
     }
 }

src/main/java/i18nupdatemod/util/AssetUtil.java

@@ -1,16 +1,39 @@
 package i18nupdatemod.util;
 
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
+import org.jetbrains.annotations.NotNull;
 
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.lang.reflect.Type;
+import java.net.HttpURLConnection;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.net.URL;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
-import java.util.concurrent.TimeUnit;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.*;
 
 public class AssetUtil {
+    private static final String CFPA_ASSET_ROOT = "http://downloader1.meitangdehulu.com:22943/";
+    private static final List<String> MIRRORS;
+
+    static {
+        // 镜像地址可以改成服务器下发
+        MIRRORS = new ArrayList<>();
+        // MIRRORS.add("http://localhost:8080/");
+        MIRRORS.add("https://raw.githubusercontent.com/");
+    }
+
     public static void download(String url, Path localFile) throws IOException, URISyntaxException {
         Log.info("Downloading: %s -> %s", url, localFile);
         FileUtils.copyURLToFile(new URI(url).toURL(), localFile.toFile(),
@@ -21,4 +44,84 @@ public static void download(String url, Path localFile) throws IOException, URIS
     public static String getString(String url) throws IOException, URISyntaxException {
         return IOUtils.toString(new URI(url).toURL(), StandardCharsets.UTF_8);
     }
+
+    public static String getFastestUrl() {
+        List<String> urls = new ArrayList<>(MIRRORS);
+        urls.add(CFPA_ASSET_ROOT);
+
+        ExecutorService executor = Executors.newFixedThreadPool(Math.max(urls.size(), 10));
+        try {
+            List<CompletableFuture<String>> futures = new ArrayList<>();
+            for (String url : urls) {
+                CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> {
+                    try {
+                        return testUrlConnection(url);
+                    } catch (IOException e) {
+                        return null; // 表示失败
+                    }
+                }, executor);
+                futures.add(future);
+            }
+
+            // 阻塞等待最快完成且成功的任务
+            String fastest = null;
+            while (!futures.isEmpty()) {
+                CompletableFuture<Object> first = CompletableFuture.anyOf(futures.toArray(new CompletableFuture[0]));
+                fastest = (String) first.join();
+
+                // 移除已完成的 future
+                futures.removeIf(CompletableFuture::isDone);
+
+                if (fastest != null) {
+                    // 成功，取消其他任务
+                    for (CompletableFuture<String> f : futures) {
+                        f.cancel(true);
+                    }
+                    Log.info("Using fastest url: %s", fastest);
+                    return fastest;
+                }
+            }
+
+            // 全部失败，返回默认 URL
+            Log.info("All urls are unreachable, using CFPA_ASSET_ROOT");
+            return CFPA_ASSET_ROOT;
+
+        } finally {
+            executor.shutdownNow();
+        }
+    }
+
+    private static String testUrlConnection(String url) throws IOException {
+        HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
+        conn.setRequestMethod("HEAD");
+        conn.setConnectTimeout(3000);
+        conn.setReadTimeout(5000);
+        conn.connect();
+        int code = conn.getResponseCode();
+        if (code >= 200 && code < 300) {
+            return url;
+        }
+        Log.debug("URL unreachable: %s, code: %d", url, code);
+        throw new IOException("URL unreachable: " + url);
+    }
+
+    @NotNull
+    public static Map<String,String> getGitIndex(){
+        try{
+            URL index_url = new URL("https://raw.githubusercontent.com/CFPAOrg/Minecraft-Mod-Language-Package/refs/heads/main/version-index.json");
+            HttpURLConnection httpConn = (HttpURLConnection) index_url.openConnection();
+            httpConn.setRequestMethod("GET");
+            httpConn.setConnectTimeout(5000);
+            httpConn.setReadTimeout(5000);
+
+            try (InputStreamReader reader = new InputStreamReader(httpConn.getInputStream())) {
+                Type mapType = new TypeToken<Map<String, String>>(){}.getType();
+                return new Gson().fromJson(reader, mapType);
+            } finally {
+                httpConn.disconnect();
+            }
+        } catch (Exception ignore) {
+            return new HashMap<>();
+        }
+    }
 }