188 lines
7.3 KiB
Java
188 lines
7.3 KiB
Java
/*
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* Copyright 2015 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.bitmessage;
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import ch.dissem.bitmessage.entity.BitmessageAddress;
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import ch.dissem.bitmessage.entity.ObjectMessage;
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import ch.dissem.bitmessage.entity.Plaintext;
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import ch.dissem.bitmessage.entity.payload.*;
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import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
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import ch.dissem.bitmessage.exception.DecryptionFailedException;
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import ch.dissem.bitmessage.ports.Labeler;
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import ch.dissem.bitmessage.ports.NetworkHandler;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.List;
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import static ch.dissem.bitmessage.entity.Plaintext.Status.PUBKEY_REQUESTED;
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class DefaultMessageListener implements NetworkHandler.MessageListener, InternalContext.ContextHolder {
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private final static Logger LOG = LoggerFactory.getLogger(DefaultMessageListener.class);
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private final Labeler labeler;
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private final BitmessageContext.Listener listener;
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private InternalContext ctx;
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public DefaultMessageListener(Labeler labeler, BitmessageContext.Listener listener) {
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this.labeler = labeler;
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this.listener = listener;
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}
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@Override
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public void setContext(InternalContext context) {
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this.ctx = context;
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}
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@Override
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@SuppressWarnings("ConstantConditions")
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public void receive(ObjectMessage object) throws IOException {
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ObjectPayload payload = object.getPayload();
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if (payload.getType() == null) {
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if (payload instanceof GenericPayload) {
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receive((GenericPayload) payload);
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}
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return;
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}
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switch (payload.getType()) {
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case GET_PUBKEY: {
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receive(object, (GetPubkey) payload);
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break;
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}
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case PUBKEY: {
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receive(object, (Pubkey) payload);
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break;
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}
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case MSG: {
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receive(object, (Msg) payload);
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break;
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}
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case BROADCAST: {
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receive(object, (Broadcast) payload);
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break;
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}
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default: {
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throw new IllegalArgumentException("Unknown payload type " + payload.getType());
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}
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}
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}
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protected void receive(ObjectMessage object, GetPubkey getPubkey) {
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BitmessageAddress identity = ctx.getAddressRepository().findIdentity(getPubkey.getRipeTag());
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if (identity != null && identity.getPrivateKey() != null && !identity.isChan()) {
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LOG.info("Got pubkey request for identity " + identity);
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// FIXME: only send pubkey if it wasn't sent in the last 28 days
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ctx.sendPubkey(identity, object.getStream());
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}
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}
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protected void receive(ObjectMessage object, Pubkey pubkey) throws IOException {
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BitmessageAddress address;
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try {
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if (pubkey instanceof V4Pubkey) {
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V4Pubkey v4Pubkey = (V4Pubkey) pubkey;
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address = ctx.getAddressRepository().findContact(v4Pubkey.getTag());
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if (address != null) {
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v4Pubkey.decrypt(address.getPublicDecryptionKey());
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}
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} else {
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address = ctx.getAddressRepository().findContact(pubkey.getRipe());
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}
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if (address != null) {
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updatePubkey(address, pubkey);
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}
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} catch (DecryptionFailedException ignore) {
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}
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}
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private void updatePubkey(BitmessageAddress address, Pubkey pubkey) {
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address.setPubkey(pubkey);
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LOG.info("Got pubkey for contact " + address);
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ctx.getAddressRepository().save(address);
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List<Plaintext> messages = ctx.getMessageRepository().findMessages(PUBKEY_REQUESTED, address);
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LOG.info("Sending " + messages.size() + " messages for contact " + address);
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for (Plaintext msg : messages) {
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ctx.getLabeler().markAsSending(msg);
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ctx.getMessageRepository().save(msg);
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ctx.send(msg);
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}
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}
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protected void receive(ObjectMessage object, Msg msg) throws IOException {
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for (BitmessageAddress identity : ctx.getAddressRepository().getIdentities()) {
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try {
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msg.decrypt(identity.getPrivateKey().getPrivateEncryptionKey());
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Plaintext plaintext = msg.getPlaintext();
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plaintext.setTo(identity);
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if (!object.isSignatureValid(plaintext.getFrom().getPubkey())) {
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LOG.warn("Msg with IV " + object.getInventoryVector() + " was successfully decrypted, but signature check failed. Ignoring.");
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} else {
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receive(object.getInventoryVector(), plaintext);
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}
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break;
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} catch (DecryptionFailedException ignore) {
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}
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}
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}
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protected void receive(GenericPayload ack) {
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if (ack.getData().length == Msg.ACK_LENGTH) {
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Plaintext msg = ctx.getMessageRepository().getMessageForAck(ack.getData());
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if (msg != null) {
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ctx.getLabeler().markAsAcknowledged(msg);
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ctx.getMessageRepository().save(msg);
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}
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}
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}
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protected void receive(ObjectMessage object, Broadcast broadcast) throws IOException {
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byte[] tag = broadcast instanceof V5Broadcast ? ((V5Broadcast) broadcast).getTag() : null;
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for (BitmessageAddress subscription : ctx.getAddressRepository().getSubscriptions(broadcast.getVersion())) {
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if (tag != null && !Arrays.equals(tag, subscription.getTag())) {
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continue;
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}
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try {
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broadcast.decrypt(subscription.getPublicDecryptionKey());
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if (!object.isSignatureValid(broadcast.getPlaintext().getFrom().getPubkey())) {
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LOG.warn("Broadcast with IV " + object.getInventoryVector() + " was successfully decrypted, but signature check failed. Ignoring.");
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} else {
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receive(object.getInventoryVector(), broadcast.getPlaintext());
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}
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} catch (DecryptionFailedException ignore) {
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}
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}
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}
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protected void receive(InventoryVector iv, Plaintext msg) {
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msg.setInventoryVector(iv);
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labeler.setLabels(msg);
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ctx.getMessageRepository().save(msg);
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listener.receive(msg);
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updatePubkey(msg.getFrom(), msg.getFrom().getPubkey());
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if (msg.getType() == Plaintext.Type.MSG && msg.getTo().has(Pubkey.Feature.DOES_ACK)) {
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ObjectMessage ack = msg.getAckMessage();
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if (ack != null) {
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ctx.getInventory().storeObject(ack);
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ctx.getNetworkHandler().offer(ack.getInventoryVector());
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}
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}
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}
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}
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