/
AutonatProtocol.java
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/
AutonatProtocol.java
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package org.peergos.protocol.autonat;
import com.google.protobuf.*;
import io.ipfs.multiaddr.*;
import io.ipfs.multihash.Multihash;
import io.libp2p.core.*;
import io.libp2p.core.Stream;
import io.libp2p.core.multiformats.*;
import io.libp2p.core.multistream.*;
import io.libp2p.protocol.*;
import org.jetbrains.annotations.*;
import org.peergos.*;
import org.peergos.protocol.autonat.pb.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.stream.*;
public class AutonatProtocol extends ProtobufProtocolHandler<AutonatProtocol.AutoNatController> {
public static class Binding extends StrictProtocolBinding<AutoNatController> {
public Binding() {
super("/libp2p/autonat/v1.0.0", new AutonatProtocol());
}
}
public interface AutoNatController {
CompletableFuture<Autonat.Message> rpc(Autonat.Message req);
default CompletableFuture<Autonat.Message.DialResponse> requestDial(PeerAddresses us) {
return rpc(Autonat.Message.newBuilder()
.setType(Autonat.Message.MessageType.DIAL)
.setDial(Autonat.Message.Dial.newBuilder()
.setPeer(Autonat.Message.PeerInfo.newBuilder()
.addAllAddrs(us.addresses.stream()
.map(a -> ByteString.copyFrom(a.serialize()))
.collect(Collectors.toList()))
.setId(ByteString.copyFrom(us.peerId.toBytes()))))
.build())
.thenApply(msg -> msg.getDialResponse());
}
}
public static class Sender implements ProtocolMessageHandler<Autonat.Message>, AutoNatController {
private final Stream stream;
private final LinkedBlockingDeque<CompletableFuture<Autonat.Message>> queue = new LinkedBlockingDeque<>();
public Sender(Stream stream) {
this.stream = stream;
}
@Override
public void onMessage(@NotNull Stream stream, Autonat.Message msg) {
queue.poll().complete(msg);
}
public CompletableFuture<Autonat.Message> rpc(Autonat.Message req) {
CompletableFuture<Autonat.Message> res = new CompletableFuture<>();
queue.add(res);
stream.writeAndFlush(req);
return res;
}
}
public static boolean isPublicAndReachable(MultiAddress addr, Multiaddr source) {
if (addr.isRelayed())
return false;
return addr.isPublic(true);
}
public static class Receiver implements ProtocolMessageHandler<Autonat.Message>, AutoNatController {
private final Stream p2pstream;
public Receiver(Stream p2pstream) {
this.p2pstream = p2pstream;
}
@Override
public void onMessage(@NotNull Stream stream, Autonat.Message msg) {
switch (msg.getType()) {
case DIAL: {
Autonat.Message.Dial dial = msg.getDial();
Multihash peerId = Multihash.deserialize(dial.getPeer().getId().toByteArray());
List<MultiAddress> requestedDials = dial.getPeer().getAddrsList().stream()
.map(b -> new MultiAddress(b.toByteArray()))
.collect(Collectors.toList());
PeerId streamPeerId = stream.remotePeerId();
if (! Arrays.equals(peerId.toBytes(), streamPeerId.getBytes())) {
p2pstream.close();
return;
}
Multiaddr remote = stream.getConnection().remoteAddress();
String remoteIp = new MultiAddress(remote.toString()).getHost();
Optional<MultiAddress> reachable = requestedDials.stream()
.filter(a -> a.getHost().equals(remoteIp))
.filter(a -> isPublicAndReachable(a, remote))
.findAny();
Autonat.Message.Builder resp = Autonat.Message.newBuilder()
.setType(Autonat.Message.MessageType.DIAL_RESPONSE);
if (reachable.isPresent()) {
resp = resp.setDialResponse(Autonat.Message.DialResponse.newBuilder()
.setStatus(Autonat.Message.ResponseStatus.OK)
.setAddr(ByteString.copyFrom(reachable.get().getBytes())));
} else {
resp = resp.setDialResponse(Autonat.Message.DialResponse.newBuilder()
.setStatus(Autonat.Message.ResponseStatus.E_DIAL_ERROR));
}
p2pstream.writeAndFlush(resp);
}
default: {}
}
}
public CompletableFuture<Autonat.Message> rpc(Autonat.Message msg) {
return CompletableFuture.failedFuture(new IllegalStateException("Cannot send form a receiver!"));
}
}
private static final int TRAFFIC_LIMIT = 2*1024;
public AutonatProtocol() {
super(Autonat.Message.getDefaultInstance(), TRAFFIC_LIMIT, TRAFFIC_LIMIT);
}
@NotNull
@Override
protected CompletableFuture<AutoNatController> onStartInitiator(@NotNull Stream stream) {
Sender replyPropagator = new Sender(stream);
stream.pushHandler(replyPropagator);
return CompletableFuture.completedFuture(replyPropagator);
}
@NotNull
@Override
protected CompletableFuture<AutoNatController> onStartResponder(@NotNull Stream stream) {
Receiver dialer = new Receiver(stream);
stream.pushHandler(dialer);
return CompletableFuture.completedFuture(dialer);
}
}