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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service
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/*
* Copyright (c) [2016] [ ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see .
*/
package org.ethereum.net.shh;
import org.apache.commons.collections4.map.LRUMap;
import org.ethereum.config.SystemProperties;
import org.ethereum.crypto.ECKey;
import org.ethereum.util.ByteUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.spongycastle.util.encoders.Hex;
import org.springframework.stereotype.Component;
import java.nio.charset.StandardCharsets;
import java.util.*;
@Component
public class WhisperImpl extends Whisper {
private final static Logger logger = LoggerFactory.getLogger("net.shh");
private Set filters = new HashSet<>();
private List knownTopics = new ArrayList<>();
private Map known = new LRUMap<>(1024); // essentially Set
private Map identities = new HashMap<>();
private List activePeers = new ArrayList<>();
BloomFilter hostBloomFilter = BloomFilter.createAll();
public WhisperImpl() {
}
@Override
public void send(String from, String to, byte[] payload, Topic[] topicList, int ttl, int workToProve) {
ECKey fromKey = null;
if (from != null && !from.isEmpty()) {
fromKey = getIdentity(from);
if (fromKey == null) {
throw new Error(String.format("Unknown identity to send from %s", from));
}
}
WhisperMessage m = new WhisperMessage()
.setFrom(fromKey)
.setTo(to)
.setPayload(payload)
.setTopics(topicList)
.setTtl(ttl)
.setWorkToProve(workToProve);
logger.info("Sending Whisper message: " + m);
addMessage(m, null);
}
public void processEnvelope(ShhEnvelopeMessage e, ShhHandler shhHandler) {
for (WhisperMessage message : e.getMessages()) {
message.decrypt(identities.values(), knownTopics);
logger.info("New Whisper message: " + message);
addMessage(message, shhHandler);
}
}
void addPeer(ShhHandler peer) {
activePeers.add(peer);
}
void removePeer(ShhHandler peer) {
activePeers.remove(peer);
}
public void watch(MessageWatcher f) {
filters.add(f);
for (Topic topic : f.getTopics()) {
hostBloomFilter.addTopic(topic);
knownTopics.add(topic);
}
notifyBloomFilterChanged();
}
public void unwatch(MessageWatcher f) {
filters.remove(f);
for (Topic topic : f.getTopics()) {
hostBloomFilter.removeTopic(topic);
}
notifyBloomFilterChanged();
}
private void notifyBloomFilterChanged() {
for (ShhHandler peer : activePeers) {
peer.sendHostBloom();
}
}
// Processing both messages:
// own outgoing messages (shhHandler == null)
// and inbound messages from peers
private void addMessage(WhisperMessage m, ShhHandler inboundPeer) {
if (!known.containsKey(m)) {
known.put(m, null);
if (inboundPeer != null) {
matchMessage(m);
}
for (ShhHandler peer : activePeers) {
if (peer != inboundPeer) {
peer.sendEnvelope(new ShhEnvelopeMessage(m));
}
}
}
}
private void matchMessage(WhisperMessage m) {
for (MessageWatcher f : filters) {
if (f.match(m.getTo(), m.getFrom(), m.getTopics())) {
f.newMessage(m);
}
}
}
public static String toIdentity(ECKey key) {
return Hex.toHexString(key.getNodeId());
}
public static ECKey fromIdentityToPub(String identity) {
try {
return identity == null ? null :
ECKey.fromPublicOnly(ByteUtil.merge(new byte[] {0x04}, Hex.decode(identity)));
} catch (Exception e) {
throw new RuntimeException("Converting identity '" + identity + "'", e);
}
}
@Override
public String addIdentity(ECKey key) {
String identity = toIdentity(key);
identities.put(identity, key);
return identity;
}
@Override
public String newIdentity() {
return addIdentity(new ECKey());
}
public ECKey getIdentity(String identity) {
if (identities.containsKey(identity)) {
return identities.get(identity);
}
return null;
}
}