ApproveTransaction.java

/******************************************************************************
 * Copyright © 2013-2016 The Nxt Core Developers.                             *
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 * See the AUTHORS.txt, DEVELOPER-AGREEMENT.txt and LICENSE.txt files at      *
 * the top-level directory of this distribution for the individual copyright  *
 * holder information and the developer policies on copyright and licensing.  *
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 * Unless otherwise agreed in a custom licensing agreement, no part of the    *
 * Nxt software, including this file, may be copied, modified, propagated,    *
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 * file.                                                                      *
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 ******************************************************************************/

package nxt.http;


import nxt.Account;
import nxt.Attachment;
import nxt.Constants;
import nxt.NxtException;
import nxt.PhasingPoll;
import nxt.util.Convert;
import org.json.simple.JSONStreamAware;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;

import static nxt.http.JSONResponses.MISSING_TRANSACTION_FULL_HASH;
import static nxt.http.JSONResponses.TOO_MANY_PHASING_VOTES;
import static nxt.http.JSONResponses.UNKNOWN_TRANSACTION_FULL_HASH;

public class ApproveTransaction extends CreateTransaction {
    static final ApproveTransaction instance = new ApproveTransaction();

    private ApproveTransaction() {
        super(new APITag[]{APITag.CREATE_TRANSACTION, APITag.PHASING}, "transactionFullHash", "transactionFullHash", "transactionFullHash",
                "revealedSecret", "revealedSecretIsText");
    }

    @Override
    JSONStreamAware processRequest(HttpServletRequest req) throws NxtException {
        String[] phasedTransactionValues = req.getParameterValues("transactionFullHash");

        if (phasedTransactionValues == null || phasedTransactionValues.length == 0) {
            return MISSING_TRANSACTION_FULL_HASH;
        }

        if (phasedTransactionValues.length > Constants.MAX_PHASING_VOTE_TRANSACTIONS) {
            return TOO_MANY_PHASING_VOTES;
        }

        List<byte[]> phasedTransactionFullHashes = new ArrayList<>(phasedTransactionValues.length);
        for (String phasedTransactionValue : phasedTransactionValues) {
            byte[] hash = Convert.parseHexString(phasedTransactionValue);
            PhasingPoll phasingPoll = PhasingPoll.getPoll(Convert.fullHashToId(hash));
            if (phasingPoll == null) {
                return UNKNOWN_TRANSACTION_FULL_HASH;
            }
            phasedTransactionFullHashes.add(hash);
        }

        byte[] secret;
        String secretValue = Convert.emptyToNull(req.getParameter("revealedSecret"));
        if (secretValue != null) {
            boolean isText = "true".equalsIgnoreCase(req.getParameter("revealedSecretIsText"));
            secret = isText ? Convert.toBytes(secretValue) : Convert.parseHexString(secretValue);
        } else {
            String secretText = Convert.emptyToNull(req.getParameter("revealedSecretText"));
            if (secretText != null) {
                secret = Convert.toBytes(secretText);
            } else {
                secret = Convert.EMPTY_BYTE;
            }
        }
        Account account = ParameterParser.getSenderAccount(req);
        Attachment attachment = new Attachment.MessagingPhasingVoteCasting(phasedTransactionFullHashes, secret);
        return createTransaction(req, account, attachment);
    }
}