mirror of
https://github.com/yushijinhun/authlib-injector.git
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64 lines
2.5 KiB
Java
64 lines
2.5 KiB
Java
/*
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* Copyright (C) 2022 Haowei Wen <yushijinhun@gmail.com> and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package moe.yushi.authlibinjector.transform.support;
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import static org.objectweb.asm.Opcodes.ASM9;
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import static org.objectweb.asm.Opcodes.ISTORE;
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import java.util.Optional;
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import org.objectweb.asm.ClassVisitor;
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import org.objectweb.asm.MethodVisitor;
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import moe.yushi.authlibinjector.transform.TransformContext;
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import moe.yushi.authlibinjector.transform.TransformUnit;
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/**
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* Hacks BungeeCord to allow special characters to occur in the username.
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*
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* Since <https://github.com/SpigotMC/BungeeCord/commit/3008d7ef2f50de7e3d38e76717df72dac7fe0da3>,
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* BungeeCord allows only certain characters to occur in the username when online-mode is on.
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*/
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public class BungeeCordAllowedCharactersTransformer implements TransformUnit {
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@Override
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public Optional<ClassVisitor> transform(ClassLoader classLoader, String className, ClassVisitor writer, TransformContext context) {
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if ("net.md_5.bungee.util.AllowedCharacters".equals(className)) {
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return Optional.of(new ClassVisitor(ASM9, writer) {
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@Override
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public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
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if ("isValidName".equals(name) && "(Ljava/lang/String;Z)Z".equals(descriptor)) {
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return new MethodVisitor(ASM9, super.visitMethod(access, name, descriptor, signature, exceptions)) {
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@Override
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public void visitCode() {
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super.visitCode();
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super.visitLdcInsn(0);
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super.visitVarInsn(ISTORE, 1);
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context.markModified();
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}
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};
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}
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return super.visitMethod(access, name, descriptor, signature, exceptions);
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}
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});
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}
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return Optional.empty();
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}
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@Override
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public String toString() {
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return "BungeeCord Allowed Characters Transformer";
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}
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}
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