234 lines
6.6 KiB
Java
234 lines
6.6 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.entity;
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import ch.dissem.bitmessage.entity.payload.ObjectPayload;
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import ch.dissem.bitmessage.entity.payload.ObjectType;
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import ch.dissem.bitmessage.entity.payload.Pubkey;
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import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
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import ch.dissem.bitmessage.entity.valueobject.PrivateKey;
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import ch.dissem.bitmessage.exception.DecryptionFailedException;
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import ch.dissem.bitmessage.utils.Bytes;
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import ch.dissem.bitmessage.utils.Encode;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import static ch.dissem.bitmessage.utils.Singleton.security;
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/**
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* The 'object' command sends an object that is shared throughout the network.
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*/
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public class ObjectMessage implements MessagePayload {
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private byte[] nonce;
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private long expiresTime;
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private long objectType;
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/**
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* The object's version
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*/
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private long version;
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private long stream;
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private ObjectPayload payload;
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private byte[] payloadBytes;
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private ObjectMessage(Builder builder) {
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nonce = builder.nonce;
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expiresTime = builder.expiresTime;
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objectType = builder.objectType;
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version = builder.payload.getVersion();
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stream = builder.streamNumber;
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payload = builder.payload;
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}
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@Override
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public Command getCommand() {
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return Command.OBJECT;
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}
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public byte[] getNonce() {
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return nonce;
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}
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public void setNonce(byte[] nonce) {
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this.nonce = nonce;
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}
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public long getExpiresTime() {
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return expiresTime;
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}
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public long getType() {
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return objectType;
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}
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public ObjectPayload getPayload() {
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return payload;
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}
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public long getVersion() {
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return version;
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}
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public long getStream() {
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return stream;
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}
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public InventoryVector getInventoryVector() {
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return new InventoryVector(
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Bytes.truncate(security().doubleSha512(nonce, getPayloadBytesWithoutNonce()), 32)
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);
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}
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private boolean isEncrypted() {
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return payload instanceof Encrypted && !((Encrypted) payload).isDecrypted();
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}
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public boolean isSigned() {
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return payload.isSigned();
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}
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private byte[] getBytesToSign() {
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try {
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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writeHeaderWithoutNonce(out);
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payload.writeBytesToSign(out);
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return out.toByteArray();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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public void sign(PrivateKey key) {
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if (payload.isSigned()) {
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payload.setSignature(security().getSignature(getBytesToSign(), key));
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}
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}
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public void decrypt(PrivateKey key) throws IOException, DecryptionFailedException {
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if (payload instanceof Encrypted) {
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((Encrypted) payload).decrypt(key.getPrivateEncryptionKey());
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}
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}
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public void decrypt(byte[] privateEncryptionKey) throws IOException, DecryptionFailedException {
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if (payload instanceof Encrypted) {
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((Encrypted) payload).decrypt(privateEncryptionKey);
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}
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}
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public void encrypt(byte[] publicEncryptionKey) throws IOException {
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if (payload instanceof Encrypted) {
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((Encrypted) payload).encrypt(publicEncryptionKey);
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}
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}
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public void encrypt(Pubkey publicKey) {
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try {
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if (payload instanceof Encrypted) {
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((Encrypted) payload).encrypt(publicKey.getEncryptionKey());
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}
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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public boolean isSignatureValid(Pubkey pubkey) throws IOException {
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if (isEncrypted()) throw new IllegalStateException("Payload must be decrypted first");
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return security().isSignatureValid(getBytesToSign(), payload.getSignature(), pubkey);
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}
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@Override
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public void write(OutputStream out) throws IOException {
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if (nonce != null) {
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out.write(nonce);
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} else {
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out.write(new byte[8]);
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}
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out.write(getPayloadBytesWithoutNonce());
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}
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private void writeHeaderWithoutNonce(OutputStream out) throws IOException {
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Encode.int64(expiresTime, out);
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Encode.int32(objectType, out);
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Encode.varInt(version, out);
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Encode.varInt(stream, out);
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}
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public byte[] getPayloadBytesWithoutNonce() {
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try {
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if (payloadBytes == null) {
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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writeHeaderWithoutNonce(out);
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payload.write(out);
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payloadBytes = out.toByteArray();
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}
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return payloadBytes;
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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public static final class Builder {
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private byte[] nonce;
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private long expiresTime;
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private long objectType = -1;
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private long streamNumber;
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private ObjectPayload payload;
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public Builder() {
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}
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public Builder nonce(byte[] nonce) {
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this.nonce = nonce;
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return this;
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}
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public Builder expiresTime(long expiresTime) {
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this.expiresTime = expiresTime;
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return this;
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}
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public Builder objectType(long objectType) {
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this.objectType = objectType;
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return this;
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}
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public Builder objectType(ObjectType objectType) {
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this.objectType = objectType.getNumber();
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return this;
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}
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public Builder stream(long streamNumber) {
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this.streamNumber = streamNumber;
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return this;
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}
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public Builder payload(ObjectPayload payload) {
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this.payload = payload;
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if (this.objectType == -1)
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this.objectType = payload.getType().getNumber();
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return this;
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}
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public ObjectMessage build() {
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return new ObjectMessage(this);
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}
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}
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}
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