/*
* This file is part of Sponge, licensed under the MIT License (MIT).
*
* Copyright (c) SpongePowered <https://www.spongepowered.org>
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.spongepowered.server.network;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Singleton;
import io.netty.buffer.Unpooled;
import net.minecraft.network.NetHandlerPlayServer;
import net.minecraft.network.PacketBuffer;
import net.minecraft.network.play.client.CPacketCustomPayload;
import net.minecraft.network.play.server.SPacketCustomPayload;
import net.minecraft.server.management.PlayerList;
import org.spongepowered.api.Platform;
import org.spongepowered.api.network.ChannelBinding;
import org.spongepowered.api.network.ChannelRegistrationException;
import org.spongepowered.api.network.RemoteConnection;
import org.spongepowered.api.plugin.PluginContainer;
import org.spongepowered.common.SpongeImpl;
import org.spongepowered.common.network.SpongeNetworkManager;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
@Singleton
public class VanillaChannelRegistrar extends SpongeNetworkManager {
public static final String INTERNAL_PREFIX = "MC|";
public static final String REGISTER_CHANNEL = "REGISTER";
public static final String UNREGISTER_CHANNEL = "UNREGISTER";
public static final char CHANNEL_SEPARATOR = '\0';
private static final Joiner CHANNEL_JOINER = Joiner.on(CHANNEL_SEPARATOR);
private final Map<String, VanillaChannelBinding> channels = new HashMap<>();
private static boolean isReservedChannel(String name) {
return name.startsWith(INTERNAL_PREFIX) || name.equals(REGISTER_CHANNEL) || name.equals(UNREGISTER_CHANNEL);
}
private void validateChannel(String name) {
if (isReservedChannel(name)) {
throw new ChannelRegistrationException("Reserved channels cannot be registered by plugins");
}
ChannelBinding current = this.channels.get(name);
if (current != null) {
throw new ChannelRegistrationException("Channel '" + name + "' is already registered by " + current.getOwner());
}
}
private void registerChannel(VanillaChannelBinding channel) {
final String name = channel.getName();
this.channels.put(name, channel);
PlayerList playerList = SpongeImpl.getServer().getPlayerList();
if (playerList != null) {
playerList.sendPacketToAllPlayers(getRegPacket(name));
}
}
@Override
public ChannelBinding.IndexedMessageChannel createChannel(Object plugin, String name) throws ChannelRegistrationException {
PluginContainer container = checkCreateChannelArgs(plugin, name);
validateChannel(name);
VanillaIndexedMessageChannel channel = new VanillaIndexedMessageChannel(this, name, container);
registerChannel(channel);
return channel;
}
@Override
public ChannelBinding.RawDataChannel createRawChannel(Object plugin, String name) throws ChannelRegistrationException {
PluginContainer container = checkCreateChannelArgs(plugin, name);
validateChannel(name);
VanillaRawDataChannel channel = new VanillaRawDataChannel(this, name, container);
registerChannel(channel);
return channel;
}
@Override
public Optional<ChannelBinding> getChannel(String channel) {
return Optional.ofNullable(this.channels.get(channel));
}
@Override
public void unbindChannel(ChannelBinding channel) {
final String name = channel.getName();
VanillaChannelBinding binding = this.channels.remove(name);
checkState(binding != null, "Channel is already unbound");
binding.invalidate();
PlayerList playerList = SpongeImpl.getServer().getPlayerList();
if (playerList != null) {
playerList.sendPacketToAllPlayers(getUnregPacket(name));
}
}
@Override
public Set<String> getRegisteredChannels(Platform.Type side) {
if (side == Platform.Type.SERVER) {
return ImmutableSet.copyOf(this.channels.keySet());
} else {
return ImmutableSet.of();
}
}
@Override
public boolean isChannelAvailable(String name) {
return !isReservedChannel(name) && !this.channels.containsKey(name);
}
public void post(RemoteConnection connection, CPacketCustomPayload packet) {
VanillaChannelBinding binding = this.channels.get(packet.getChannelName());
if (binding != null) {
binding.post(connection, packet.getBufferData());
}
}
public void registerChannels(NetHandlerPlayServer netHandler) {
// Register our channel list on the client
String channels = CHANNEL_JOINER.join(this.channels.keySet());
PacketBuffer buffer = new PacketBuffer(Unpooled.wrappedBuffer(channels.getBytes(StandardCharsets.UTF_8)));
netHandler.sendPacket(new SPacketCustomPayload(REGISTER_CHANNEL, buffer));
}
}