co.rsk.net.discovery.message.FindNodePeerMessage.java Source code

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Here is the source code for co.rsk.net.discovery.message.FindNodePeerMessage.java

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/*
 * This file is part of RskJ
 * Copyright (C) 2017 RSK Labs Ltd.
 *
 * This program 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.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package co.rsk.net.discovery.message;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.ethereum.crypto.ECKey;
import org.ethereum.util.RLP;
import org.ethereum.util.RLPItem;
import org.ethereum.util.RLPList;
import org.spongycastle.util.encoders.Hex;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

/**
 * Created by mario on 16/02/17.
 */
public class FindNodePeerMessage extends PeerDiscoveryMessage {

    private byte[] nodeId;
    private String messageId;

    public FindNodePeerMessage(byte[] wire, byte[] mdc, byte[] signature, byte[] type, byte[] data) {
        super(wire, mdc, signature, type, data);
        this.parse(data);
    }

    private FindNodePeerMessage() {
    }

    public static FindNodePeerMessage create(byte[] nodeId, String check, ECKey privKey) {

        /* RLP Encode data */
        byte[] rlpCheck = RLP.encodeElement(check.getBytes(StandardCharsets.UTF_8));
        byte[] rlpNodeId = RLP.encodeElement(nodeId);

        byte[] type = new byte[] { (byte) DiscoveryMessageType.FIND_NODE.getTypeValue() };
        byte[] data = RLP.encodeList(rlpNodeId, rlpCheck);

        FindNodePeerMessage message = new FindNodePeerMessage();
        message.encode(type, data, privKey);

        message.messageId = check;
        message.nodeId = nodeId;

        return message;
    }

    @Override
    public final void parse(byte[] data) {

        RLPList dataList = (RLPList) RLP.decode2OneItem(data, 0);
        RLPItem chk = (RLPItem) dataList.get(1);
        this.messageId = new String(chk.getRLPData(), Charset.forName("UTF-8"));
        RLPItem nodeRlp = (RLPItem) dataList.get(0);
        this.nodeId = nodeRlp.getRLPData();
    }

    public String getMessageId() {
        return this.messageId;
    }

    @Override
    public DiscoveryMessageType getMessageType() {
        return DiscoveryMessageType.FIND_NODE;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this).append(Hex.toHexString(this.nodeId)).append(this.messageId).toString();
    }

}