show auth server name in menu screen

README.en.md

@@ -76,4 +76,9 @@ Configure Minecraft server with the following JVM parameter:
     Features (see below) depending on local HTTP server will be unavailable:
      - Mojang namespace
      - Legacy skin API polyfill
+
+-Dauthlibinjector.noShowServerName
+    Do not show authentication server name in Minecraft menu screen.
+    By default, authlib-injector alters --versionType parameter to display the authentication server name.
+    This feature can be disabled using this option.
 ```

README.md

@@ -75,6 +75,10 @@ gradle
     以下依赖内建 HTTP 服务器的功能将不可用:
      - Mojang 命名空间
      - 旧式皮肤 API polyfill
+
+-Dauthlibinjector.noShowServerName
+    不要在 Minecraft 主界面展示验证服务器名称.
+    默认情况下, authlib-injector 通过更改 --versionType 参数来在 Minecraft 主界面显示验证服务器名称, 使用本选项可以禁用该功能.
 ```
 
 ## 捐助

src/main/java/moe/yushi/authlibinjector/AuthlibInjector.java

@@ -50,6 +50,7 @@ import moe.yushi.authlibinjector.httpd.URLFilter;
 import moe.yushi.authlibinjector.httpd.URLProcessor;
 import moe.yushi.authlibinjector.transform.ClassTransformer;
 import moe.yushi.authlibinjector.transform.DumpClassListener;
+import moe.yushi.authlibinjector.transform.support.AuthServerNameInjector;
 import moe.yushi.authlibinjector.transform.support.AuthlibLogInterceptor;
 import moe.yushi.authlibinjector.transform.support.CitizensTransformer;
 import moe.yushi.authlibinjector.transform.support.ConstantURLTransformUnit;
@@ -94,6 +95,9 @@ public final class AuthlibInjector {
 		ProxyParameterWorkaround.init();
 		MC52974Workaround.init();
 		MC52974_1710Workaround.init();
+		if (!Config.noShowServerName) {
+			AuthServerNameInjector.init(apiMetadata);
+		}
 	}
 
 	private static Optional<String> getPrefetchedResponse() {

src/main/java/moe/yushi/authlibinjector/Config.java

@@ -59,6 +59,7 @@ public final class Config {
 	public static Set<String> ignoredPackages;
 	public static FeatureOption mojangNamespace;
 	public static FeatureOption legacySkinPolyfill;
+	public static boolean noShowServerName;
 
 	private static void initDebugOptions() {
 		String prop = System.getProperty("authlibinjector.debug");
@@ -202,5 +203,6 @@ public final class Config {
 		mojangNamespace = parseFeatureOption("authlibinjector.mojangNamespace");
 		legacySkinPolyfill = parseFeatureOption("authlibinjector.legacySkinPolyfill");
 		httpdDisabled = System.getProperty("authlibinjector.disableHttpd") != null;
+		noShowServerName = System.getProperty("authlibinjector.noShowServerName") != null;
 	}
 }

src/main/java/moe/yushi/authlibinjector/transform/support/AuthServerNameInjector.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2020  Haowei Wen <yushijinhun@gmail.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package moe.yushi.authlibinjector.transform.support;
+
+import static moe.yushi.authlibinjector.util.Logging.log;
+import moe.yushi.authlibinjector.APIMetadata;
+import moe.yushi.authlibinjector.util.Logging.Level;
+
+public final class AuthServerNameInjector {
+	private AuthServerNameInjector() {}
+
+	private static String getServerName(APIMetadata meta) {
+		Object serverName = meta.getMeta().get("serverName");
+		if (serverName instanceof String) {
+			return (String) serverName;
+		} else {
+			return meta.getApiRoot();
+		}
+	}
+
+	public static void init(APIMetadata meta) {
+		MainArgumentsTransformer.getArgumentsListeners().add(args -> {
+			for (int i = 0; i < args.length - 1; i++) {
+				if ("--versionType".equals(args[i])) {
+					String serverName = getServerName(meta);
+					log(Level.DEBUG, "Setting versionType to server name: " + serverName);
+					args[i + 1] = serverName;
+					break;
+				}
+			}
+			return args;
+		});
+	}
+
+}