/*
* This file is part of LanternServer, licensed under the MIT License (MIT).
*
* Copyright (c) LanternPowered <https://www.lanternpowered.org>
* 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.lanternpowered.server.service.permission;
import static com.google.common.base.Preconditions.checkNotNull;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.LoadingCache;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import org.lanternpowered.server.game.Lantern;
import org.spongepowered.api.command.CommandSource;
import org.spongepowered.api.command.source.RemoteSource;
import org.spongepowered.api.service.context.Context;
import org.spongepowered.api.service.context.ContextCalculator;
import org.spongepowered.api.service.permission.Subject;
import org.spongepowered.api.world.Locatable;
import org.spongepowered.api.world.World;
import java.net.InetAddress;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
/**
* A context calculator handling world contexts.
*/
public class LanternContextCalculator implements ContextCalculator<Subject> {
private final LoadingCache<RemoteSource, Set<Context>> remoteIpCache = buildAddressCache(Context.REMOTE_IP_KEY,
input -> input.getConnection().getAddress().getAddress());
private final LoadingCache<RemoteSource, Set<Context>> localIpCache = buildAddressCache(Context.LOCAL_IP_KEY,
input -> input.getConnection().getVirtualHost().getAddress());
private LoadingCache<RemoteSource, Set<Context>> buildAddressCache(final String contextKey,
final Function<RemoteSource, InetAddress> function) {
return Caffeine.newBuilder()
.weakKeys()
.build(key -> {
final ImmutableSet.Builder<Context> builder = ImmutableSet.builder();
final InetAddress addr = checkNotNull(function.apply(key), "addr");
builder.add(new Context(contextKey, addr.getHostAddress()));
//noinspection Guava,ConstantConditions
for (String set : Maps.filterValues(Lantern.getGame().getGlobalConfig().getIpSets(),
input -> input.apply(addr)).keySet()) {
builder.add(new Context(contextKey, set));
}
return builder.build();
});
}
@Override
public void accumulateContexts(Subject subject, Set<Context> accumulator) {
final Optional<CommandSource> subjSource = subject.getCommandSource();
if (subjSource.isPresent()) {
final CommandSource source = subjSource.get();
if (source instanceof Locatable) {
final World currentExt = ((Locatable) source).getWorld();
accumulator.add(currentExt.getContext());
accumulator.add((currentExt.getDimension().getContext()));
}
if (source instanceof RemoteSource) {
final RemoteSource rem = (RemoteSource) source;
accumulator.addAll(this.remoteIpCache.get(rem));
accumulator.addAll(this.localIpCache.get(rem));
accumulator.add(new Context(Context.LOCAL_PORT_KEY, String.valueOf(rem.getConnection().getVirtualHost().getPort())));
accumulator.add(new Context(Context.LOCAL_HOST_KEY, rem.getConnection().getVirtualHost().getHostName()));
}
}
}
@Override
public boolean matches(Context context, Subject subject) {
final Optional<CommandSource> subjSource = subject.getCommandSource();
if (subjSource.isPresent()) {
final CommandSource source = subjSource.get();
if (source instanceof Locatable) {
final Locatable located = (Locatable) source;
if (context.getType().equals(Context.WORLD_KEY)) {
return located.getWorld().getContext().equals(context);
} else if (context.getType().equals(Context.DIMENSION_KEY)) {
return located.getWorld().getDimension().getContext().equals(context);
}
}
if (source instanceof RemoteSource) {
final RemoteSource remote = (RemoteSource) source;
if (context.getType().equals(Context.LOCAL_HOST_KEY)) {
return context.getValue().equals(remote.getConnection().getVirtualHost().getHostName());
} else if (context.getType().equals(Context.LOCAL_PORT_KEY)) {
return context.getValue().equals(String.valueOf(remote.getConnection().getVirtualHost().getPort()));
} else if (context.getType().equals(Context.LOCAL_IP_KEY)) {
return this.localIpCache.get(remote).contains(context);
} else if (context.getType().equals(Context.REMOTE_IP_KEY)) {
return this.remoteIpCache.get(remote).contains(context);
}
}
}
return false;
}
}