src/game/java/net/minecraft/client/multiplayer/resolver/AddressCheck.java

package net.minecraft.client.multiplayer.resolver;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Streams;
import com.mojang.blocklist.BlockListSupplier;
import java.util.Objects;
import java.util.ServiceLoader;
import java.util.function.Predicate;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public interface AddressCheck {
    boolean isAllowed(ResolvedServerAddress p_171829_);

    boolean isAllowed(ServerAddress p_171830_);

    static AddressCheck createFromService() {
        final ImmutableList<Predicate<String>> immutablelist = Streams.stream(ServiceLoader.load(BlockListSupplier.class))
            .map(BlockListSupplier::createBlockList)
            .filter(Objects::nonNull)
            .collect(ImmutableList.toImmutableList());
        return new AddressCheck() {
            @Override
            public boolean isAllowed(ResolvedServerAddress p_171835_) {
                String s = p_171835_.getHostName();
                String s1 = p_171835_.getHostIp();
                return immutablelist.stream().noneMatch(p_171841_ -> p_171841_.test(s) || p_171841_.test(s1));
            }

            @Override
            public boolean isAllowed(ServerAddress p_171837_) {
                String s = p_171837_.getHost();
                return immutablelist.stream().noneMatch(p_171844_ -> p_171844_.test(s));
            }
        };
    }
}