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disable papermc's username check

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Haowei Wen 2022-07-02 12:53:41 +08:00
parent dbfcbf5b8c
commit 942b056c58
2 changed files with 64 additions and 0 deletions
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2
src/main/java/moe/yushi/authlibinjector/AuthlibInjector.java
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@ -61,6 +61,7 @@ import moe.yushi.authlibinjector.transform.support.ConstantURLTransformUnit;
import moe.yushi.authlibinjector.transform.support.MC52974Workaround;
import moe.yushi.authlibinjector.transform.support.MC52974_1710Workaround;
import moe.yushi.authlibinjector.transform.support.MainArgumentsTransformer;
import moe.yushi.authlibinjector.transform.support.PaperUsernameCheckTransformer;
import moe.yushi.authlibinjector.transform.support.ProxyParameterWorkaround;
import moe.yushi.authlibinjector.transform.support.SkinWhitelistTransformUnit;
import moe.yushi.authlibinjector.transform.support.UsernameCharacterCheckTransformer;
@ -277,6 +278,7 @@ public final class AuthlibInjector {
transformer.units.add(new ConcatenateURLTransformUnit());
transformer.units.add(new BungeeCordAllowedCharactersTransformer());
transformer.units.add(new UsernameCharacterCheckTransformer());
transformer.units.add(new PaperUsernameCheckTransformer());
transformer.units.add(new SkinWhitelistTransformUnit());
SkinWhitelistTransformUnit.getWhitelistedDomains().addAll(config.getSkinDomains());

62
src/main/java/moe/yushi/authlibinjector/transform/support/PaperUsernameCheckTransformer.java Normal file
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@ -0,0 +1,62 @@
/*
* 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";
}
}