Add support for UTF-8 encoded locale files

Fixes SKCraft#467

launcher/src/main/java/com/skcraft/launcher/util/LocaleEncodingControl.java

@@ -0,0 +1,81 @@
+package com.skcraft.launcher.util;
+
+import lombok.extern.java.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.net.URL;
+import java.net.URLConnection;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.Locale;
+import java.util.PropertyResourceBundle;
+import java.util.ResourceBundle;
+
+@Log
+public class LocaleEncodingControl extends ResourceBundle.Control {
+	@Override
+	public ResourceBundle newBundle(String baseName, Locale locale, String format, ClassLoader loader, boolean reload) throws IllegalAccessException, InstantiationException, IOException {
+		if (!format.equals("java.properties")) {
+			return super.newBundle(baseName, locale, format, loader, reload);
+		}
+
+		String bundleName = this.toBundleName(baseName, locale);
+		String resourceName = this.toResourceName(bundleName, "properties");
+
+		InputStream is = this.getResourceAsStream(resourceName, loader, reload);
+		if (is == null) {
+			return null;
+		}
+
+		// Let's do the timewalk
+		boolean isUtf8;
+		is.mark(3);
+		{
+			byte[] buf = new byte[3];
+			int read = 0;
+			while (read < 3) {
+				read = is.read(buf);
+			}
+
+			// the BOM is 0xEF,0xBB,0xBF
+			isUtf8 = buf[0] == (byte) 0xEF && buf[1] == (byte) 0xBB && buf[2] == (byte) 0xBF;
+		}
+		is.reset();
+
+		if (isUtf8) {
+			log.info("Found UTF-8 locale file " + resourceName);
+		}
+
+		Charset charset = isUtf8 ? StandardCharsets.UTF_8 : StandardCharsets.ISO_8859_1;
+		Reader reader = new InputStreamReader(is, charset);
+
+		try {
+			PropertyResourceBundle bundle = new PropertyResourceBundle(reader);
+			reader.close();
+
+			return bundle;
+		} finally {
+			// Just in case of exception...
+			reader.close();
+		}
+	}
+
+	private InputStream getResourceAsStream(String resourceName, ClassLoader loader, boolean reload) throws IOException {
+		if (reload) {
+			URL url = loader.getResource(resourceName);
+			if (url != null) {
+				URLConnection conn = url.openConnection();
+				if (conn != null) {
+					conn.setUseCaches(false);
+
+					return conn.getInputStream();
+				}
+			}
+		}
+
+		return loader.getResourceAsStream(resourceName);
+	}
+}

launcher/src/main/java/com/skcraft/launcher/util/SharedLocale.java

@@ -96,7 +96,7 @@ public static boolean loadBundle(@NonNull String baseName, @NonNull Locale local
         try {
             SharedLocale.locale = locale;
             bundle = ResourceBundle.getBundle(baseName, locale,
-                    SharedLocale.class.getClassLoader());
+                    SharedLocale.class.getClassLoader(), new LocaleEncodingControl());
             return true;
         } catch (MissingResourceException e) {
             log.log(Level.SEVERE, "Failed to load resource bundle", e);