Alfajor

A ViaVersion hack library to intercept and override packet mappers of specific protocols.

Example code

public class DemoBukkitPlugin extends JavaPlugin {

    @Override
    public void onLoad() {
        // Shortcut of Via.getManager().getProtocolManager().getProtocol();
        Protocol1_9To1_8 proto = ViaAlfajor.getProtocol(Protocol1_9To1_8.class);
        // Class to start the dirty tricks
        ProtocolHandle<ClientboundPackets1_8, ServerboundPackets1_9> handle = ProtocolHandle.wrap(protocol);
        // Inject a PacketRemapper into spawn_mob remappers
        // It wouldn't override any registered remapper
        handle.injectClientbound(ClientboundPackets1_8.SPAWN_MOB,
            remapper -> {
                // Do whatever you want here
            });

        // Inject a remapper for serverbound packets
        handle.injectServerbound(ServerboundPackets1_9.VEHICLE_MOVE,
            remapper -> {
                //...
            }
        );

        // Inject a remapper overriding all the spawn_mob remappers.
        handle.injectOverrideClientbound(ClientboundPackets1_8.SPAWN_MOB,
            remapper -> {
                // ...
            });
    }
}

Note:

• PacketRemapper needs to map their fields
• Be careful with adding remappers; fields and objects might already be consumed and will throw an exception

There is a plugin example of coloured beds for clients that support it with a 1.8.8 server base.

Dependency

Maven:

<repositories>
    <repository>
        <id>unnamed-snapshots</id>
        <url>https://repo.unnamed.team/repository/unnamed-snapshots/</url>
    </repository>
</repositories>

<dependency>
    <groupId>me.oczi.alfajor</groupId>
    <artifactId>Alfajor-api</artifactId>
    <version>1.1-SNAPSHOT</version>
    <scope>compile</scope>
</dependency>

Gradle:

repositories {
    maven { url 'https://repo.unnamed.team/repository/unnamed-snapshots/' }
}

compileOnly('me.oczi.alfajor:Alfajor-api:1.1-SNAPSHOT')

Build

The entire project is built with JDK 8 using ViaVersion 4.4.2 as the target.

The API is licensed under The MIT License and the plugin example is under GPL v3 License.