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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.common.ws;
import com.google.protobuf.ByteString;
import me.lucko.bytesocks.client.BytesocksClient;
import me.lucko.spark.common.SparkPlatform;
import me.lucko.spark.proto.SparkWebSocketProtos.PacketWrapper;
import me.lucko.spark.proto.SparkWebSocketProtos.RawPacket;
import java.io.IOException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.util.Base64;
import java.util.function.Consumer;
import java.util.logging.Level;
/**
* Controls a websocket connection between a spark server (the plugin/mod) and a spark client (the web viewer).
*/
public class ViewerSocketConnection implements BytesocksClient.Listener, AutoCloseable {
/** The protocol version */
public static final int VERSION_1 = 1;
/** The crypto algorithm used to sign/verify messages sent between the server and client */
public static final CryptoAlgorithm CRYPTO = CryptoAlgorithm.RSA2048;
/** The platform */
private final SparkPlatform platform;
/** The underlying listener */
private final Listener listener;
/** The private key used to sign messages sent from this connection */
private final PrivateKey privateKey;
/** The bytesocks socket */
private final BytesocksClient.Socket socket;
public ViewerSocketConnection(SparkPlatform platform, BytesocksClient client, Listener listener) throws Exception {
this.platform = platform;
this.listener = listener;
this.privateKey = platform.getTrustedKeyStore().getLocalPrivateKey();
this.socket = client.createAndConnect(this);
}
public interface Listener {
/**
* Checks if the given public key is trusted
*
* @param publicKey the public key
* @return true if trusted
*/
boolean isKeyTrusted(PublicKey publicKey);
/**
* Handles a packet sent to the socket
*
* @param packet the packet that was sent
* @param verified if the packet was signed by a trusted key
* @param publicKey the public key the packet was signed with
*/
void onPacket(PacketWrapper packet, boolean verified, PublicKey publicKey) throws Exception;
}
/**
* Gets the bytesocks channel id
*
* @return the channel id
*/
public String getChannelId() {
return this.socket.getChannelId();
}
/**
* Gets if the underlying socket is open
*
* @return true if the socket is open
*/
public boolean isOpen() {
return this.socket.isOpen();
}
@Override
public void onText(CharSequence data) {
try {
RawPacket packet = decodeRawPacket(data);
handleRawPacket(packet);
} catch (Exception e) {
this.platform.getPlugin().log(Level.WARNING, "Exception occurred while reading data from the socket");
e.printStackTrace();
}
}
@Override
public void onError(Throwable error) {
this.platform.getPlugin().log(Level.INFO, "Socket error: " + error.getClass().getName() + " " + error.getMessage());
error.printStackTrace();
}
@Override
public void onClose(int statusCode, String reason) {
//this.platform.getPlugin().log(Level.INFO, "Socket closed with status " + statusCode + " and reason " + reason);
}
/**
* Sends a packet to the socket.
*
* @param packetBuilder the builder to construct the wrapper packet
*/
public void sendPacket(Consumer<PacketWrapper.Builder> packetBuilder) {
PacketWrapper.Builder builder = PacketWrapper.newBuilder();
packetBuilder.accept(builder);
PacketWrapper wrapper = builder.build();
try {
sendPacket(wrapper);
} catch (Exception e) {
this.platform.getPlugin().log(Level.WARNING, "Exception occurred while sending data to the socket");
e.printStackTrace();
}
}
/**
* Sends a packet to the socket.
*
* @param packet the packet to send
*/
private void sendPacket(PacketWrapper packet) throws Exception {
ByteString msg = packet.toByteString();
// sign the message using the server private key
Signature sign = CRYPTO.createSignature();
sign.initSign(this.privateKey);
sign.update(msg.asReadOnlyByteBuffer());
byte[] signature = sign.sign();
sendRawPacket(RawPacket.newBuilder()
.setVersion(VERSION_1)
.setSignature(ByteString.copyFrom(signature))
.setMessage(msg)
.build()
);
}
/**
* Sends a raw packet to the socket.
*
* @param packet the packet to send
*/
private void sendRawPacket(RawPacket packet) throws IOException {
byte[] buf = packet.toByteArray();
String encoded = Base64.getEncoder().encodeToString(buf);
this.socket.send(encoded);
}
/**
* Decodes a raw packet sent to the socket.
*
* @param data the encoded data
* @return the decoded packet
*/
private RawPacket decodeRawPacket(CharSequence data) throws IOException {
byte[] buf = Base64.getDecoder().decode(data.toString());
return RawPacket.parseFrom(buf);
}
/**
* Handles a raw packet sent to the socket
*
* @param packet the packet
*/
private void handleRawPacket(RawPacket packet) throws Exception {
int version = packet.getVersion();
if (version != VERSION_1) {
throw new IllegalArgumentException("Unsupported packet version " + version);
}
ByteString message = packet.getMessage();
PublicKey publicKey = CRYPTO.decodePublicKey(packet.getPublicKey());
ByteString signature = packet.getSignature();
boolean verified = false;
if (signature != null && publicKey != null && this.listener.isKeyTrusted(publicKey)) {
Signature sign = CRYPTO.createSignature();
sign.initVerify(publicKey);
sign.update(message.asReadOnlyByteBuffer());
verified = sign.verify(signature.toByteArray());
}
PacketWrapper wrapper = PacketWrapper.parseFrom(message);
this.listener.onPacket(wrapper, verified, publicKey);
}
@Override
public void close() {
this.socket.close(1001 /* going away */, "spark plugin disconnected");
}
}
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