mirror of
https://github.com/yushijinhun/authlib-injector.git
synced 2024-06-03 00:59:00 +02:00
63 lines
2.3 KiB
Java
63 lines
2.3 KiB
Java
/*
|
|
* Copyright (C) 2022 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 org.objectweb.asm.Opcodes.*;
|
|
import java.util.Optional;
|
|
import org.objectweb.asm.ClassVisitor;
|
|
import org.objectweb.asm.MethodVisitor;
|
|
import moe.yushi.authlibinjector.transform.TransformContext;
|
|
import moe.yushi.authlibinjector.transform.TransformUnit;
|
|
|
|
/**
|
|
* Disables PaperMC's username check.
|
|
* See <https://github.com/PaperMC/Paper/blob/master/patches/server/0823-Validate-usernames.patch>.
|
|
*/
|
|
public class PaperUsernameCheckTransformer implements TransformUnit {
|
|
|
|
@Override
|
|
public Optional<ClassVisitor> transform(ClassLoader classLoader, String className, ClassVisitor writer, TransformContext context) {
|
|
if (!context.getStringConstants().contains("Invalid characters in username")) {
|
|
return Optional.empty();
|
|
}
|
|
|
|
return Optional.of(new ClassVisitor(ASM9, writer) {
|
|
@Override
|
|
public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
|
|
return new MethodVisitor(ASM9, super.visitMethod(access, name, descriptor, signature, exceptions)) {
|
|
|
|
@Override
|
|
public void visitFieldInsn(int opcode, String owner, String name, String descriptor) {
|
|
if (opcode == GETFIELD && "iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation".equals(name)) {
|
|
context.markModified();
|
|
visitInsn(POP);
|
|
visitInsn(ICONST_1);
|
|
} else {
|
|
super.visitFieldInsn(opcode, owner, name, descriptor);
|
|
}
|
|
}
|
|
};
|
|
}
|
|
});
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
return "Paper Username Checker Transformer";
|
|
}
|
|
}
|