feat: 添加地理位置检查工具以优化资源下载源选择

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

@@ -23,12 +23,12 @@
 
 public class AssetUtil {
     private static final String CFPA_ASSET_ROOT = "http://downloader1.meitangdehulu.com:22943/";
+    private static final String GITHUB = "https://raw.githubusercontent.com/";
     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("https://raw.githubusercontent.com/");
         // 此镜像源维护者：502y
         MIRRORS.add("http://8.137.167.65:64684/");
     }
@@ -45,34 +45,38 @@ public static String getString(String url) throws IOException, URISyntaxExceptio
     }
 
     public static String getFastestUrl() {
-        List<String> urls = new ArrayList<>(MIRRORS);
-        urls.add(CFPA_ASSET_ROOT);
+        List<String> urls = new ArrayList<>();
+
+        // 根据地理位置选择源列表
+        if (LocationDetectUtil.isMainlandChina()) {
+            // 中国大陆：测速选择最快的国内源
+            urls.addAll(MIRRORS);
+            urls.add(CFPA_ASSET_ROOT);
+            Log.info("Inside mainland China: Testing mirrors...");
+        } else {
+            // 海外用户：直接使用 GitHub 源
+            urls.add(GITHUB);
+            Log.info("Outside mainland China: Using GitHub source...");
+        }
 
         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(() -> {
+                futures.add(CompletableFuture.supplyAsync(() -> {
                     try {
                         return testUrlConnection(url);
                     } catch (IOException e) {
-                        return null; // 表示失败
+                        return null;
                     }
-                }, executor);
-                futures.add(future);
+                }, executor));
             }
 
-            // 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
+                fastest = (String) CompletableFuture.anyOf(futures.toArray(new CompletableFuture[0])).join();
                 futures.removeIf(CompletableFuture::isDone);
-
                 if (fastest != null) {
-                    // 成功，取消其他任务
                     for (CompletableFuture<String> f : futures) {
                         f.cancel(true);
                     }
@@ -81,8 +85,7 @@ public static String getFastestUrl() {
                 }
             }
 
-            // 全部失败，返回默认 URL
-            Log.info("All urls are unreachable, using CFPA_ASSET_ROOT");
+            Log.info("All sources unreachable, using CFPA_ASSET_ROOT as fallback");
             return CFPA_ASSET_ROOT;
 
         } finally {

src/main/java/i18nupdatemod/util/LocationDetectUtil.java

@@ -0,0 +1,68 @@
+package i18nupdatemod.util;
+
+import org.apache.commons.io.IOUtils;
+
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+
+public class LocationDetectUtil {
+    private static Boolean cached = null;
+
+    private static final String[][] GEO_APIS = {
+            {"Kugou", "https://mips.kugou.com/check/iscn?&format=json"},
+            {"IP.SB", "https://api.ip.sb/geoip"}
+    };
+
+    public static boolean isMainlandChina() {
+        if (cached != null) {
+            return cached;
+        }
+
+        for (String[] api : GEO_APIS) {
+            Boolean result = tryApi(api[0], api[1]);
+            if (result != null) {
+                cached = result;
+                return cached;
+            }
+        }
+
+        cached = false;
+        return false;
+    }
+
+    private static Boolean tryApi(String name, String url) {
+        try {
+            HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
+            conn.setConnectTimeout(5000);
+            conn.setReadTimeout(5000);
+
+            if (conn.getResponseCode() == 200) {
+                String response = IOUtils.toString(conn.getInputStream(), StandardCharsets.UTF_8);
+                boolean isChina = parseResponse(response);
+                Log.info("Location Detected (" + name + " API): " + (isChina ? "Inside mainland China" : "Outside mainland China"));
+                return isChina;
+            }
+        } catch (Exception e) {
+            Log.debug(name + " API detection failed: " + e.getMessage());
+        }
+        return null;
+    }
+
+    private static boolean parseResponse(String response) {
+        response = response.trim();
+        // Kugou API JSON: {"flag": 1} 或 {"flag": true}
+        if (response.contains("\"flag\":1") || response.contains("\"flag\": 1") ||response.contains("\"flag\":true") || response.contains("\"flag\": true")) {
+            return true;
+        }
+        // IP.SB API JSON: {"country_code": "CN"}
+        if (response.contains("\"country_code\":\"CN\"") || response.contains("\"country_code\": \"CN\"")) {
+            return true;
+        }
+        return false;
+    }
+
+    public static void resetCache() {
+        cached = null;
+    }
+}