version 1.0

Author: pan90

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+
+lib

.idea/.gitignore

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+# FixUsernameCheck
+
+这是一个Minecraft服务器补丁，可以禁用玩家游戏名检查，从而可以在服务器中使用中文名
+
+## 使用方法
+
+1. 下载补丁的jar文件
+
+2. 启动服务器时添加`-javaagent:FixUsernameCheck.jar`参数。
+   如：`java -javaagent:FixUsernameCheck.jar -jar server.jar --nogui`
+   `FixUsernameCheck.jar`为你的补丁文件，这里与MC服务器核心放置在同一目录下
+
+## 说明
+
+- 如果补丁jar文件放置在其它目录下，请使用相对路径或绝对路径，如：
+  `java -javaagent:./fix/FixUsernameCheck.jar -jar server.jar --nogui`

.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>top.zpian</groupId>
+    <artifactId>FixUsernameCheck</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/org.ow2.asm/asm -->
+        <dependency>
+            <groupId>org.ow2.asm</groupId>
+            <artifactId>asm</artifactId>
+            <version>9.7.1</version>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-resources-plugin</artifactId>
+                <version>3.3.1</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.5.1</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <transformers>
+                                <transformer
+                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <manifestEntries>
+                                        <Premain-Class>top.zpian.fix_username_check.AgentMain</Premain-Class>
+                                        <Agent-Class>top.zpian.fix_username_check.AgentMain</Agent-Class>
+                                        <Can-Redefine-Classes>true</Can-Redefine-Classes>
+                                    </manifestEntries>
+                                </transformer>
+                            </transformers>
+
+                            <createDependencyReducedPom>false</createDependencyReducedPom>
+                            <filters>
+                                <filter>
+                                    <artifact>org.ow2.asm:asm</artifact>
+                                    <excludes>
+                                        <exclude>META-INF/MANIFEST.MF</exclude>
+                                        <exclude>module-info.class</exclude>
+                                    </excludes>
+                                </filter>
+                            </filters>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

.idea/misc.xml

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+package top.zpian.fix_username_check;
+
+import org.objectweb.asm.*;
+
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.lang.instrument.Instrumentation;
+import java.security.ProtectionDomain;
+
+public class AgentMain {
+    public static void premain(String arg, Instrumentation inst) {
+
+        System.out.println("FixUsernameCheck - premain");
+
+        inst.addTransformer(new ClassFileTransformer() {
+            @Override
+            public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
+
+                // 不是需要的类
+                if (!className.equals("com/destroystokyo/paper/profile/CraftPlayerProfile")) {
+                    return ClassFileTransformer.super.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
+                }
+
+                System.out.println("Transform class: " + className);
+
+                final ClassReader cr = new ClassReader(classfileBuffer);
+
+                final ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
+
+                cr.accept(new ClassVisitor(Opcodes.ASM9, cw) {
+                    @Override
+                    public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+
+                        if (!name.equals("createAuthLibProfile")) {
+                            return super.visitMethod(access, name, descriptor, signature, exceptions);
+                        }
+
+                        System.out.println("Transform method: " + name);
+
+                        final var mv = super.visitMethod(access, name, descriptor, signature, exceptions);
+                        return new MethodVisitor(Opcodes.ASM9, mv) {
+                            @Override
+                            public void visitMethodInsn(int opcode, String owner, String name, String descriptor, boolean isInterface) {
+
+//                                System.out.printf("%d %s %s %s %s%n", opcode, owner, name, descriptor, isInterface);
+
+                                if (opcode == Opcodes.INVOKESTATIC &&
+                                        name.equals("checkArgument") &&
+                                        owner.equals("com/google/common/base/Preconditions") &&
+                                        descriptor.equals("(ZLjava/lang/String;Ljava/lang/Object;)V") && !isInterface
+                                ) {
+                                    System.out.println("取消静态方法调用: " + owner + "/" + name);
+
+                                    // 弹出参数
+                                    this.visitInsn(Opcodes.POP);
+                                    this.visitInsn(Opcodes.POP);
+                                    this.visitInsn(Opcodes.POP);
+
+                                    return;
+                                }
+
+                                super.visitMethodInsn(opcode, owner, name, descriptor, isInterface);
+                            }
+                        };
+                    }
+                }, ClassReader.EXPAND_FRAMES);
+
+                return cw.toByteArray();
+            }
+        });
+    }
+}