在 Windows 平台通过 GeoID 检测用户所处国家/区域 (#3891)

Author: Glavo

HMCL/src/main/java/org/jackhuang/hmcl/ui/account/AccountListPage.java

@@ -43,9 +43,14 @@
 import org.jackhuang.hmcl.ui.decorator.DecoratorPage;
 import org.jackhuang.hmcl.util.javafx.BindingMapping;
 import org.jackhuang.hmcl.util.javafx.MappedObservableList;
+import org.jackhuang.hmcl.util.platform.NativeUtils;
+import org.jackhuang.hmcl.util.platform.OperatingSystem;
+import org.jackhuang.hmcl.util.platform.windows.Kernel32;
+import org.jackhuang.hmcl.util.platform.windows.WinConstants;
 
 import java.net.URI;
 import java.time.ZoneId;
+import java.time.ZonedDateTime;
 import java.util.Locale;
 
 import static org.jackhuang.hmcl.setting.ConfigHolder.globalConfig;
@@ -57,11 +62,28 @@
 public final class AccountListPage extends DecoratorAnimatedPage implements DecoratorPage {
     static final BooleanProperty RESTRICTED = new SimpleBooleanProperty(true);
 
+    private static boolean isExemptedRegion() {
+        if ("Asia/Shanghai".equals(ZoneId.systemDefault().getId()))
+            return true;
+
+        if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS
+                && NativeUtils.USE_JNA
+                && ZonedDateTime.now().getOffset().getTotalSeconds() == 8 * 3600) { // GMT+8
+            Kernel32 kernel32 = Kernel32.INSTANCE;
+
+            // https://learn.microsoft.com/windows/win32/intl/table-of-geographical-locations
+            if (kernel32 != null && kernel32.GetUserGeoID(WinConstants.GEOCLASS_NATION) == 45)
+                return true;
+        }
+
+        return false;
+    }
+
     static {
         String property = System.getProperty("hmcl.offline.auth.restricted", "auto");
 
         if ("false".equals(property)
-                || "auto".equals(property) && "Asia/Shanghai".equals(ZoneId.systemDefault().getId())
+                || "auto".equals(property) && isExemptedRegion()
                 || globalConfig().isEnableOfflineAccount())
             RESTRICTED.set(false);
         else

HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/windows/Kernel32.java

@@ -44,4 +44,8 @@ public interface Kernel32 extends StdCallLibrary {
      */
     int GetACP();
 
+    /**
+     * @see <a href="https://learn.microsoft.com/windows/win32/api/winnls/nf-winnls-getusergeoid">GetUserGeoID function</a>
+     */
+    int GetUserGeoID(int geoClass);
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/windows/WinConstants.java

@@ -36,4 +36,8 @@ public interface WinConstants {
     long HKEY_CURRENT_CONFIG = 0x80000005L;
     long HKEY_DYN_DATA = 0x80000006L;
     long HKEY_CURRENT_USER_LOCAL_SETTINGS = 0x80000007L;
+
+    int GEOCLASS_NATION = 16;
+    int GEOCLASS_REGION = 14;
+    int GEOCLASS_ALL = 0;
 }