248 lines
9.4 KiB
Java
248 lines
9.4 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2021 ViaVersion and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package com.viaversion.viaversion.api.protocol.base;
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import com.viaversion.viaversion.api.connection.UserConnection;
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import com.viaversion.viaversion.api.data.MappingData;
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import com.viaversion.viaversion.api.platform.providers.ViaProviders;
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import com.viaversion.viaversion.api.protocol.AbstractSimpleProtocol;
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import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
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import com.viaversion.viaversion.api.protocol.packet.Direction;
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import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
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import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
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import com.viaversion.viaversion.api.protocol.packet.State;
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import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
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import org.checkerframework.checker.nullness.qual.Nullable;
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import java.util.List;
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/**
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* Abstract protocol class handling packet transformation between two protocol versions.
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* Clientbound and serverbount packet types can be set to enforce correct usage of them.
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*
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* @param <C1> old clientbound packet types
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* @param <C2> new clientbound packet types
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* @param <S1> old serverbound packet types
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* @param <S2> new serverbound packet types
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* @see AbstractSimpleProtocol for a helper class if you do not want to define any of the types above
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*/
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public interface Protocol<C1 extends ClientboundPacketType, C2 extends ClientboundPacketType, S1 extends ServerboundPacketType, S2 extends ServerboundPacketType> {
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/**
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* Should this protocol filter an object packet from this class.
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* Default: false
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*
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* @param packetClass The class of the current input
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* @return True if it should handle the filtering
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*/
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default boolean isFiltered(Class packetClass) {
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return false;
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}
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/**
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* Filter a packet into the output
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*
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* @param info The current user connection
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* @param packet The input packet as an object (NMS)
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* @param output The list to put the object into.
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* @throws Exception Throws exception if cancelled / error.
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*/
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void filterPacket(UserConnection info, Object packet, List output) throws Exception;
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/**
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* Loads the mappingdata.
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*/
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void loadMappingData();
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/**
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* Handle protocol registration phase, use this to register providers / tasks.
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* <p>
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* To be overridden if needed.
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*
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* @param providers The current providers
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*/
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void register(ViaProviders providers);
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/**
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* Initialise a user for this protocol setting up objects.
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* /!\ WARNING - May be called more than once in a single {@link UserConnection}
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* <p>
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* To be overridden if needed.
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*
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* @param userConnection The user to initialise
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*/
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void init(UserConnection userConnection);
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/**
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* Register an incoming packet, with simple id transformation.
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*
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* @param state The state which the packet is sent in.
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* @param oldPacketID The old packet ID
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* @param newPacketID The new packet ID
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*/
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void registerIncoming(State state, int oldPacketID, int newPacketID);
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/**
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* Register an incoming packet, with id transformation and remapper.
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*
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* @param state The state which the packet is sent in.
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* @param oldPacketID The old packet ID
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* @param newPacketID The new packet ID
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* @param packetRemapper The remapper to use for the packet
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*/
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void registerIncoming(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper);
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void registerIncoming(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper, boolean override);
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void cancelIncoming(State state, int oldPacketID, int newPacketID);
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void cancelIncoming(State state, int newPacketID);
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/**
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* Register an outgoing packet, with simple id transformation.
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*
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* @param state The state which the packet is sent in.
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* @param oldPacketID The old packet ID
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* @param newPacketID The new packet ID
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*/
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void registerOutgoing(State state, int oldPacketID, int newPacketID);
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/**
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* Register an outgoing packet, with id transformation and remapper.
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*
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* @param state The state which the packet is sent in.
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* @param oldPacketID The old packet ID
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* @param newPacketID The new packet ID
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* @param packetRemapper The remapper to use for the packet
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*/
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void registerOutgoing(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper);
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void cancelOutgoing(State state, int oldPacketID, int newPacketID);
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void cancelOutgoing(State state, int oldPacketID);
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void registerOutgoing(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper, boolean override);
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/**
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* Registers an outgoing protocol and automatically maps it to the new id.
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*
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* @param packetType clientbound packet type the server sends
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* @param packetRemapper remapper
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*/
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void registerOutgoing(C1 packetType, @Nullable PacketRemapper packetRemapper);
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/**
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* Registers an outgoing protocol.
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*
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* @param packetType clientbound packet type the server initially sends
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* @param mappedPacketType clientbound packet type after transforming for the client
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* @param packetRemapper remapper
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*/
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void registerOutgoing(C1 packetType, C2 mappedPacketType, @Nullable PacketRemapper packetRemapper);
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/**
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* Maps a packet type to another packet type without a packet handler.
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* Note that this should not be called for simple channel mappings of the same packet; this is already done automatically.
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*
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* @param packetType clientbound packet type the server initially sends
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* @param mappedPacketType clientbound packet type after transforming for the client
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*/
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void registerOutgoing(C1 packetType, C2 mappedPacketType);
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void cancelOutgoing(C1 packetType);
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/**
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* Registers an incoming protocol and automatically maps it to the server's id.
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*
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* @param packetType serverbound packet type the client sends
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* @param packetRemapper remapper
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*/
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void registerIncoming(S2 packetType, @Nullable PacketRemapper packetRemapper);
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/**
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* Registers an incoming protocol.
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*
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* @param packetType serverbound packet type initially sent by the client
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* @param mappedPacketType serverbound packet type after transforming for the server
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* @param packetRemapper remapper
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*/
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void registerIncoming(S2 packetType, S1 mappedPacketType, @Nullable PacketRemapper packetRemapper);
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void cancelIncoming(S2 packetType);
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/**
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* Checks if an outgoing packet has already been registered.
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*
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* @param state state which the packet is sent in
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* @param oldPacketID old packet ID
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* @return true if already registered
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*/
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boolean hasRegisteredOutgoing(State state, int oldPacketID);
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/**
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* Checks if an incoming packet has already been registered.
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*
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* @param state state which the packet is sent in
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* @param newPacketId packet ID
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* @return true if already registered
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*/
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boolean hasRegisteredIncoming(State state, int newPacketId);
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/**
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* Transform a packet using this protocol
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*
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* @param direction The direction the packet is going in
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* @param state The current protocol state
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* @param packetWrapper The packet wrapper to transform
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* @throws Exception Throws exception if it fails to transform
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*/
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void transform(Direction direction, State state, PacketWrapper packetWrapper) throws Exception;
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@Nullable <T> T get(Class<T> objectClass);
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void put(Object object);
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/**
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* Returns true if this Protocol's {@link #loadMappingData()} method should be called.
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* <p>
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* This does *not* necessarily mean that {@link #getMappingData()} is non-null, since this may be
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* overriden, depending on special cases.
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*
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* @return true if this Protocol's {@link #loadMappingData()} method should be called
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*/
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boolean hasMappingDataToLoad();
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default @Nullable MappingData getMappingData() {
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return null;
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}
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/**
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* Returns whether this protocol is a base protocol.
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*
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* @return whether this represents a base protocol
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*/
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default boolean isBaseProtocol() {
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return false;
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}
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}
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