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/**
* Copyright 2011 Google Inc.
* Copyright 2014 Andreas Schildbach
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.matthewmitchell.nubitsj.core;
import com.matthewmitchell.nubitsj.core.TransactionConfidence.ConfidenceType;
import com.matthewmitchell.nubitsj.crypto.TransactionSignature;
import com.matthewmitchell.nubitsj.script.Script;
import com.matthewmitchell.nubitsj.script.ScriptBuilder;
import com.matthewmitchell.nubitsj.script.ScriptOpCodes;
import com.matthewmitchell.nubitsj.utils.ExchangeRate;
import com.matthewmitchell.nubitsj.wallet.WalletTransaction.Pool;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableMap;
import com.google.common.primitives.Ints;
import com.google.common.primitives.Longs;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.io.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
import static com.matthewmitchell.nubitsj.core.Utils.*;
import static com.google.common.base.Preconditions.checkState;
/**
* <p>A transaction represents the movement of coins from some addresses to some other addresses. It can also represent
* the minting of new coins. A Transaction object corresponds to the equivalent in the Nubits C++ implementation.</p>
*
* <p>Transactions are the fundamental atoms of Nubits and have many powerful features. Read
* <a href="http://code.google.com/p/bitcoinj/wiki/WorkingWithTransactions">"Working with transactions"</a> in the
* documentation to learn more about how to use this class.</p>
*
* <p>All Nubits transactions are at risk of being reversed, though the risk is much less than with traditional payment
* systems. Transactions have <i>confidence levels</i>, which help you decide whether to trust a transaction or not.
* Whether to trust a transaction is something that needs to be decided on a case by case basis - a rule that makes
* sense for selling MP3s might not make sense for selling cars, or accepting payments from a family member. If you
* are building a wallet, how to present confidence to your users is something to consider carefully.</p>
*/
public class Transaction extends ChildMessage implements Serializable {
/**
* A comparator that can be used to sort transactions by their updateTime field. The ordering goes from most recent
* into the past.
*/
public static final Comparator<Transaction> SORT_TX_BY_UPDATE_TIME = new Comparator<Transaction>() {
@Override
public int compare(final Transaction tx1, final Transaction tx2) {
final long time1 = tx1.getUpdateTime().getTime();
final long time2 = tx2.getUpdateTime().getTime();
final int updateTimeComparison = -(Longs.compare(time1, time2));
//If time1==time2, compare by tx hash to make comparator consistent with equals
return updateTimeComparison != 0 ? updateTimeComparison : tx1.getHash().compareTo(tx2.getHash());
}
};
/** A comparator that can be used to sort transactions by their chain height. */
public static final Comparator<Transaction> SORT_TX_BY_HEIGHT = new Comparator<Transaction>() {
@Override
public int compare(final Transaction tx1, final Transaction tx2) {
final int height1 = tx1.getConfidence().getAppearedAtChainHeight();
final int height2 = tx2.getConfidence().getAppearedAtChainHeight();
final int heightComparison = -(Ints.compare(height1, height2));
//If height1==height2, compare by tx hash to make comparator consistent with equals
return heightComparison != 0 ? heightComparison : tx1.getHash().compareTo(tx2.getHash());
}
};
private static final Logger log = LoggerFactory.getLogger(Transaction.class);
private static final long serialVersionUID = -8567546957352643140L;
/** Threshold for lockTime: below this value it is interpreted as block number, otherwise as timestamp. **/
public static final int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC
/** How many bytes a transaction can be before it won't be relayed anymore. Currently 100kb. */
public static final int MAX_STANDARD_TX_SIZE = 100000;
/**
* If fee is lower than this value (in satoshis), a default reference client will treat it as if there were no fee.
*/
public static final Coin REFERENCE_DEFAULT_MIN_TX_FEE = Coin.valueOf(100);
/**
* Any standard (ie pay-to-address) output smaller than this value (in satoshis) will be rejected by the network.
* Currently it's 100 satoshis.
*/
public static final Coin MIN_OUTPUT_VALUE = Coin.valueOf(100);
public final static byte NUSHARES = 'S';
public final static byte NUBITS = 'B';
// These are serialized in both nubits and java serialization.
private long version;
private long time;
private ArrayList<TransactionInput> inputs;
private ArrayList<TransactionOutput> outputs;
private byte coinType;
private long lockTime;
// This is either the time the transaction was broadcast as measured from the local clock, or the time from the
// block in which it was included. Note that this can be changed by re-orgs so the wallet may update this field.
// Old serialized transactions don't have this field, thus null is valid. It is used for returning an ordered
// list of transactions from a wallet, which is helpful for presenting to users.
private Date updatedAt;
// This is an in memory helper only.
private transient Sha256Hash hash;
// Data about how confirmed this tx is. Serialized, may be null.
@Nullable private TransactionConfidence confidence;
// Records a map of which blocks the transaction has appeared in (keys) to an index within that block (values).
// The "index" is not a real index, instead the values are only meaningful relative to each other. For example,
// consider two transactions that appear in the same block, t1 and t2, where t2 spends an output of t1. Both
// will have the same block hash as a key in their appearsInHashes, but the counter would be 1 and 2 respectively
// regardless of where they actually appeared in the block.
//
// If this transaction is not stored in the wallet, appearsInHashes is null.
private Map<Sha256Hash, Integer> appearsInHashes;
// Transactions can be encoded in a way that will use more bytes than is optimal
// (due to VarInts having multiple encodings)
// MAX_BLOCK_SIZE must be compared to the optimal encoding, not the actual encoding, so when parsing, we keep track
// of the size of the ideal encoding in addition to the actual message size (which Message needs) so that Blocks
// can properly keep track of optimal encoded size
private transient int optimalEncodingMessageSize;
/**
* This enum describes the underlying reason the transaction was created. It's useful for rendering wallet GUIs
* more appropriately.
*/
public enum Purpose {
/** Used when the purpose of a transaction is genuinely unknown. */
UNKNOWN,
/** Transaction created to satisfy a user payment request. */
USER_PAYMENT,
/** Transaction automatically created and broadcast in order to reallocate money from old to new keys. */
KEY_ROTATION,
/** Transaction that uses up pledges to an assurance contract */
ASSURANCE_CONTRACT_CLAIM,
/** Transaction that makes a pledge to an assurance contract. */
ASSURANCE_CONTRACT_PLEDGE,
/** Send-to-self transaction that exists just to create an output of the right size we can pledge. */
ASSURANCE_CONTRACT_STUB
// In future: de/refragmentation, privacy boosting/mixing, child-pays-for-parent fees, etc.
}
private Purpose purpose = Purpose.UNKNOWN;
/**
* This field can be used by applications to record the exchange rate that was valid when the transaction happened.
* It's optional.
*/
@Nullable
private ExchangeRate exchangeRate;
/**
* This field can be used to record the memo of the payment request that initiated the transaction. It's optional.
*/
@Nullable
private String memo;
public Transaction(NetworkParameters params) {
super(params);
version = 1;
time = Utils.currentTimeSeconds();
inputs = new ArrayList<TransactionInput>();
outputs = new ArrayList<TransactionOutput>();
coinType = NUBITS;
// We don't initialize appearsIn deliberately as it's only useful for transactions stored in the wallet.
length = 8; // 8 for std fields
}
public Transaction(NetworkParameters params, byte coinType) {
this(params);
this.coinType = coinType;
}
/**
* Creates a transaction from the given serialized bytes, eg, from a block or a tx network message.
*/
public Transaction(NetworkParameters params, byte[] payloadBytes) throws ProtocolException {
super(params, payloadBytes, 0);
}
/**
* Creates a transaction by reading payload starting from offset bytes in. Length of a transaction is fixed.
*/
public Transaction(NetworkParameters params, byte[] payload, int offset) throws ProtocolException {
super(params, payload, offset);
// inputs/outputs will be created in parse()
}
/**
* Creates a transaction by reading payload starting from offset bytes in. Length of a transaction is fixed.
* @param params NetworkParameters object.
* @param payload Nubits protocol formatted byte array containing message content.
* @param offset The location of the first payload byte within the array.
* @param parseLazy Whether to perform a full parse immediately or delay until a read is requested.
* @param parseRetain Whether to retain the backing byte array for quick reserialization.
* If true and the backing byte array is invalidated due to modification of a field then
* the cached bytes may be repopulated and retained if the message is serialized again in the future.
* @param length The length of message if known. Usually this is provided when deserializing of the wire
* as the length will be provided as part of the header. If unknown then set to Message.UNKNOWN_LENGTH
* @throws ProtocolException
*/
public Transaction(NetworkParameters params, byte[] payload, int offset, @Nullable Message parent, boolean parseLazy, boolean parseRetain, int length)
throws ProtocolException {
super(params, payload, offset, parent, parseLazy, parseRetain, length);
}
/**
* Creates a transaction by reading payload. Length of a transaction is fixed.
*/
public Transaction(NetworkParameters params, byte[] payload, @Nullable Message parent, boolean parseLazy, boolean parseRetain, int length)
throws ProtocolException {
super(params, payload, 0, parent, parseLazy, parseRetain, length);
}
/**
* Returns the transaction hash as you see them in the block explorer.
*/
@Override
public Sha256Hash getHash() {
if (hash == null) {
byte[] bits = nubitsSerialize();
hash = Sha256Hash.wrapReversed(Sha256Hash.hashTwice(bits));
}
return hash;
}
/**
* Used by NubitsSerializer. The serializer has to calculate a hash for checksumming so to
* avoid wasting the considerable effort a set method is provided so the serializer can set it.
*
* No verification is performed on this hash.
*/
void setHash(Sha256Hash hash) {
this.hash = hash;
}
public String getHashAsString() {
return getHash().toString();
}
/**
* Calculates the sum of the outputs that are sending coins to a key in the wallet. The flag controls whether to
* include spent outputs or not.
*/
Coin getValueSentToMe(TransactionBag transactionBag, boolean includeSpent) {
maybeParse();
// This is tested in WalletTest.
Coin v = Coin.ZERO;
for (TransactionOutput o : outputs) {
if (!o.isMineOrWatched(transactionBag)) continue;
if (!includeSpent && !o.isAvailableForSpending()) continue;
v = v.add(o.getValue());
}
return v;
}
/*
* If isSpent - check that all my outputs spent, otherwise check that there at least
* one unspent.
*/
boolean isConsistent(TransactionBag transactionBag, boolean isSpent) {
boolean isActuallySpent = true;
for (TransactionOutput o : outputs) {
if (o.isAvailableForSpending()) {
if (o.isMineOrWatched(transactionBag)) isActuallySpent = false;
if (o.getSpentBy() != null) {
log.error("isAvailableForSpending != spentBy");
return false;
}
} else {
if (o.getSpentBy() == null) {
log.error("isAvailableForSpending != spentBy");
return false;
}
}
}
return isActuallySpent == isSpent;
}
/**
* Calculates the sum of the outputs that are sending coins to a key in the wallet.
*/
public Coin getValueSentToMe(TransactionBag transactionBag) {
return getValueSentToMe(transactionBag, true);
}
/**
* Returns a map of block [hashes] which contain the transaction mapped to relativity counters, or null if this
* transaction doesn't have that data because it's not stored in the wallet or because it has never appeared in a
* block.
*/
@Nullable
public Map<Sha256Hash, Integer> getAppearsInHashes() {
return appearsInHashes != null ? ImmutableMap.copyOf(appearsInHashes) : null;
}
/**
* Convenience wrapper around getConfidence().getConfidenceType()
* @return true if this transaction hasn't been seen in any block yet.
*/
public boolean isPending() {
return getConfidence().getConfidenceType() == TransactionConfidence.ConfidenceType.PENDING;
}
/**
* <p>Puts the given block in the internal set of blocks in which this transaction appears. This is
* used by the wallet to ensure transactions that appear on side chains are recorded properly even though the
* block stores do not save the transaction data at all.</p>
*
* <p>If there is a re-org this will be called once for each block that was previously seen, to update which block
* is the best chain. The best chain block is guaranteed to be called last. So this must be idempotent.</p>
*
* <p>Sets updatedAt to be the earliest valid block time where this tx was seen.</p>
*
* @param block The {@link StoredBlock} in which the transaction has appeared.
* @param bestChain whether to set the updatedAt timestamp from the block header (only if not already set)
* @param relativityOffset A number that disambiguates the order of transactions within a block.
*/
public void setBlockAppearance(StoredBlock block, boolean bestChain, int relativityOffset) {
long blockTime = block.getHeader().getTimeSeconds() * 1000;
if (bestChain && (updatedAt == null || updatedAt.getTime() == 0 || updatedAt.getTime() > blockTime)) {
updatedAt = new Date(blockTime);
}
addBlockAppearance(block.getHeader().getHash(), relativityOffset);
if (bestChain) {
TransactionConfidence transactionConfidence = getConfidence();
// This sets type to BUILDING and depth to one.
transactionConfidence.setAppearedAtChainHeight(block.getHeight());
}
}
public void addBlockAppearance(final Sha256Hash blockHash, int relativityOffset) {
if (appearsInHashes == null) {
// TODO: This could be a lot more memory efficient as we'll typically only store one element.
appearsInHashes = new TreeMap<Sha256Hash, Integer>();
}
appearsInHashes.put(blockHash, relativityOffset);
}
/**
* Calculates the sum of the inputs that are spending coins with keys in the wallet. This requires the
* transactions sending coins to those keys to be in the wallet. This method will not attempt to download the
* blocks containing the input transactions if the key is in the wallet but the transactions are not.
*
* @return sum of the inputs that are spending coins with keys in the wallet
*/
public Coin getValueSentFromMe(TransactionBag wallet) throws ScriptException {
maybeParse();
// This is tested in WalletTest.
Coin v = Coin.ZERO;
for (TransactionInput input : inputs) {
// This input is taking value from a transaction in our wallet. To discover the value,
// we must find the connected transaction.
TransactionOutput connected = input.getConnectedOutput(wallet.getTransactionPool(Pool.UNSPENT));
if (connected == null)
connected = input.getConnectedOutput(wallet.getTransactionPool(Pool.SPENT));
if (connected == null)
connected = input.getConnectedOutput(wallet.getTransactionPool(Pool.PENDING));
if (connected == null)
continue;
// The connected output may be the change to the sender of a previous input sent to this wallet. In this
// case we ignore it.
if (!connected.isMineOrWatched(wallet))
continue;
v = v.add(connected.getValue());
}
return v;
}
@Nullable private Coin cachedValue;
@Nullable private TransactionBag cachedForBag;
/**
* Returns the difference of {@link Transaction#getValueSentToMe(TransactionBag)} and {@link Transaction#getValueSentFromMe(TransactionBag)}.
*/
public Coin getValue(TransactionBag wallet) throws ScriptException {
// FIXME: TEMP PERF HACK FOR ANDROID - this crap can go away once we have a real payments API.
boolean isAndroid = Utils.isAndroidRuntime();
if (isAndroid && cachedValue != null && cachedForBag == wallet)
return cachedValue;
Coin result = getValueSentToMe(wallet).subtract(getValueSentFromMe(wallet));
if (isAndroid) {
cachedValue = result;
cachedForBag = wallet;
}
return result;
}
/**
* The transaction fee is the difference of the value of all inputs and the value of all outputs. Currently, the fee
* can only be determined for transactions created by us.
*
* @return fee, or null if it cannot be determined
*/
public Coin getFee() {
Coin fee = Coin.ZERO;
for (TransactionInput input : inputs) {
if (input.getValue() == null)
return null;
fee = fee.add(input.getValue());
}
for (TransactionOutput output : outputs) {
fee = fee.subtract(output.getValue());
}
return fee;
}
/**
* Returns true if any of the outputs is marked as spent.
*/
public boolean isAnyOutputSpent() {
maybeParse();
for (TransactionOutput output : outputs) {
if (!output.isAvailableForSpending())
return true;
}
return false;
}
/**
* Returns false if this transaction has at least one output that is owned by the given wallet and unspent, true
* otherwise.
*/
public boolean isEveryOwnedOutputSpent(TransactionBag transactionBag) {
maybeParse();
for (TransactionOutput output : outputs) {
if (output.isAvailableForSpending() && output.isMineOrWatched(transactionBag))
return false;
}
return true;
}
public long getTime() {
return time;
}
public void setTime(long nTime) {
this.time = nTime;
}
/**
* Returns the earliest time at which the transaction was seen (broadcast or included into the chain),
* or the epoch if that information isn't available.
*/
public Date getUpdateTime() {
if (updatedAt == null) {
// Older wallets did not store this field. Set to the epoch.
updatedAt = new Date(0);
}
return updatedAt;
}
public void setUpdateTime(Date updatedAt) {
this.updatedAt = updatedAt;
}
/**
* These constants are a part of a scriptSig signature on the inputs. They define the details of how a
* transaction can be redeemed, specifically, they control how the hash of the transaction is calculated.
* <p/>
* In the official client, this enum also has another flag, SIGHASH_ANYONECANPAY. In this implementation,
* that's kept separate. Only SIGHASH_ALL is actually used in the official client today. The other flags
* exist to allow for distributed contracts.
*/
public enum SigHash {
ALL, // 1
NONE, // 2
SINGLE, // 3
}
public static final byte SIGHASH_ANYONECANPAY_VALUE = (byte) 0x80;
@Override
protected void unCache() {
super.unCache();
hash = null;
}
@Override
protected void parseLite() throws ProtocolException {
//skip this if the length has been provided i.e. the tx is not part of a block
if (parseLazy && length == UNKNOWN_LENGTH) {
//If length hasn't been provided this tx is probably contained within a block.
//In parseRetain mode the block needs to know how long the transaction is
//unfortunately this requires a fairly deep (though not total) parse.
//This is due to the fact that transactions in the block's list do not include a
//size header and inputs/outputs are also variable length due the contained
//script so each must be instantiated so the scriptlength varint can be read
//to calculate total length of the transaction.
//We will still persist will this semi-light parsing because getting the lengths
//of the various components gains us the ability to cache the backing bytearrays
//so that only those subcomponents that have changed will need to be reserialized.
//parse();
//parsed = true;
length = calcLength(payload, offset);
cursor = offset + length;
}
}
protected static int calcLength(byte[] buf, int offset) {
VarInt varint;
// jump past version (uint32) and time (uint32)
int cursor = offset + 8;
int i;
long scriptLen;
varint = new VarInt(buf, cursor);
long txInCount = varint.value;
cursor += varint.getOriginalSizeInBytes();
for (i = 0; i < txInCount; i++) {
// 36 = length of previous_outpoint
cursor += 36;
varint = new VarInt(buf, cursor);
scriptLen = varint.value;
// 4 = length of sequence field (unint32)
cursor += scriptLen + 4 + varint.getOriginalSizeInBytes();
}
varint = new VarInt(buf, cursor);
long txOutCount = varint.value;
cursor += varint.getOriginalSizeInBytes();
for (i = 0; i < txOutCount; i++) {
// 8 = length of tx value field (uint64)
cursor += 8;
varint = new VarInt(buf, cursor);
scriptLen = varint.value;
cursor += scriptLen + varint.getOriginalSizeInBytes();
}
// 5 = length of lock_time field (uint32) plus coin type
return cursor - offset + 5;
}
@Override
void parse() throws ProtocolException {
if (parsed)
return;
cursor = offset;
version = readUint32();
time = readUint32();
optimalEncodingMessageSize = 8;
// First come the inputs.
long numInputs = readVarInt();
optimalEncodingMessageSize += VarInt.sizeOf(numInputs);
inputs = new ArrayList<TransactionInput>((int) numInputs);
for (long i = 0; i < numInputs; i++) {
TransactionInput input = new TransactionInput(params, this, payload, cursor, parseLazy, parseRetain);
inputs.add(input);
long scriptLen = readVarInt(TransactionOutPoint.MESSAGE_LENGTH);
optimalEncodingMessageSize += TransactionOutPoint.MESSAGE_LENGTH + VarInt.sizeOf(scriptLen) + scriptLen + 4;
cursor += scriptLen + 4;
}
// Now the outputs
long numOutputs = readVarInt();
optimalEncodingMessageSize += VarInt.sizeOf(numOutputs);
outputs = new ArrayList<TransactionOutput>((int) numOutputs);
for (long i = 0; i < numOutputs; i++) {
TransactionOutput output = new TransactionOutput(params, this, payload, cursor, parseLazy, parseRetain);
outputs.add(output);
long scriptLen = readVarInt(8);
optimalEncodingMessageSize += 8 + VarInt.sizeOf(scriptLen) + scriptLen;
cursor += scriptLen;
}
lockTime = readUint32();
coinType = payload[cursor++];
optimalEncodingMessageSize += 5;
length = cursor - offset;
}
public int getOptimalEncodingMessageSize() {
if (optimalEncodingMessageSize != 0)
return optimalEncodingMessageSize;
maybeParse();
if (optimalEncodingMessageSize != 0)
return optimalEncodingMessageSize;
optimalEncodingMessageSize = getMessageSize();
return optimalEncodingMessageSize;
}
/**
* A coinbase transaction is one that creates a new coin. They are the first transaction in each block and their
* value is determined by a formula that all implementations of Nubits share. In 2011 the value of a coinbase
* transaction is 50 coins, but in future it will be less. A coinbase transaction is defined not only by its
* position in a block but by the data in the inputs.
*/
public boolean isCoinBase() {
maybeParse();
return inputs.size() == 1 && inputs.get(0).isCoinBase();
}
/**
* A transaction is mature if it is either a building coinbase tx that is as deep or deeper than the required coinbase depth, or a non-coinbase tx.
*/
public boolean isMature() {
if (!isCoinBase())
return true;
if (getConfidence().getConfidenceType() != ConfidenceType.BUILDING)
return false;
return getConfidence().getDepthInBlocks() >= params.getSpendableCoinbaseDepth();
}
@Override
public String toString() {
return toString(null);
}
/**
* A human readable version of the transaction useful for debugging. The format is not guaranteed to be stable.
* @param chain If provided, will be used to estimate lock times (if set). Can be null.
*/
public String toString(@Nullable AbstractBlockChain chain) {
// Basic info about the tx.
StringBuilder s = new StringBuilder();
s.append(" ").append(getHashAsString()).append('\n');
if (hasConfidence())
s.append(" confidence: ").append(getConfidence()).append('\n');
if (isTimeLocked()) {
String time;
if (lockTime < LOCKTIME_THRESHOLD) {
time = "block " + lockTime;
if (chain != null) {
time = time + " (estimated to be reached at " +
chain.estimateBlockTime((int)lockTime).toString() + ")";
}
} else {
time = new Date(lockTime*1000).toString();
}
s.append(String.format(Locale.US, " time locked until %s%n", time));
}
if (inputs.size() == 0) {
s.append(String.format(Locale.US, " INCOMPLETE: No inputs!%n"));
return s.toString();
}
if (isCoinBase()) {
String script;
String script2;
try {
script = inputs.get(0).getScriptSig().toString();
script2 = outputs.get(0).getScriptPubKey().toString();
} catch (ScriptException e) {
script = "???";
script2 = "???";
}
s.append(" == COINBASE TXN (scriptSig ").append(script)
.append(") (scriptPubKey ").append(script2).append(")\n");
return s.toString();
}
for (TransactionInput in : inputs) {
s.append(" ");
s.append("in ");
try {
Script scriptSig = in.getScriptSig();
s.append(scriptSig);
if (in.getValue() != null)
s.append(" ").append(in.getValue().toFriendlyString());
s.append("\n ");
s.append("outpoint:");
final TransactionOutPoint outpoint = in.getOutpoint();
s.append(outpoint.toString());
final TransactionOutput connectedOutput = outpoint.getConnectedOutput();
if (connectedOutput != null) {
Script scriptPubKey = connectedOutput.getScriptPubKey();
if (scriptPubKey.isSentToAddress() || scriptPubKey.isPayToScriptHash()) {
s.append(" hash160:");
s.append(Utils.HEX.encode(scriptPubKey.getPubKeyHash()));
}
}
if (in.hasSequence())
s.append("\n (has sequence)");
} catch (Exception e) {
s.append("[exception: ").append(e.getMessage()).append("]");
}
s.append(String.format(Locale.US, "%n"));
}
for (TransactionOutput out : outputs) {
s.append(" ");
s.append("out ");
try {
Script scriptPubKey = out.getScriptPubKey();
s.append(scriptPubKey);
s.append(" ");
s.append(out.getValue().toFriendlyString());
if (!out.isAvailableForSpending()) {
s.append(" Spent");
}
if (out.getSpentBy() != null) {
s.append(" by ");
s.append(out.getSpentBy().getParentTransaction().getHashAsString());
}
} catch (Exception e) {
s.append("[exception: ").append(e.getMessage()).append("]");
}
s.append(String.format(Locale.US, "%n"));
}
final Coin fee = getFee();
if (fee != null) {
final int size = unsafeNubitsSerialize().length;
s.append(" fee ").append(fee.multiply(1000).divide(size).toFriendlyString()).append("/kB, ")
.append(fee.toFriendlyString()).append(" for ").append(size).append(" bytes\n");
}
if (purpose != null)
s.append(" prps ").append(purpose).append(String.format(Locale.US, "%n"));
return s.toString();
}
/**
* Removes all the inputs from this transaction.
* Note that this also invalidates the length attribute
*/
public void clearInputs() {
unCache();
for (TransactionInput input : inputs) {
input.setParent(null);
}
inputs.clear();
// You wanted to reserialize, right?
this.length = this.nubitsSerialize().length;
}
/**
* Adds an input to this transaction that imports value from the given output. Note that this input is NOT
* complete and after every input is added with addInput() and every output is added with addOutput(),
* signInputs() must be called to finalize the transaction and finish the inputs off. Otherwise it won't be
* accepted by the network. Returns the newly created input.
*/
public TransactionInput addInput(TransactionOutput from) {
return addInput(new TransactionInput(params, this, from));
}
/** Adds an input directly, with no checking that it's valid. Returns the new input. */
public TransactionInput addInput(TransactionInput input) {
unCache();
input.setParent(this);
inputs.add(input);
adjustLength(inputs.size(), input.length);
return input;
}
/** Adds an input directly, with no checking that it's valid. Returns the new input. */
public TransactionInput addInput(Sha256Hash spendTxHash, long outputIndex, Script script) {
return addInput(new TransactionInput(params, this, script.getProgram(), new TransactionOutPoint(params, outputIndex, spendTxHash)));
}
/**
* Adds a new and fully signed input for the given parameters. Note that this method is <b>not</b> thread safe
* and requires external synchronization. Please refer to general documentation on Nubits scripting and contracts
* to understand the values of sigHash and anyoneCanPay: otherwise you can use the other form of this method
* that sets them to typical defaults.
*
* @throws ScriptException if the scriptPubKey is not a pay to address or pay to pubkey script.
*/
public TransactionInput addSignedInput(TransactionOutPoint prevOut, Script scriptPubKey, ECKey sigKey,
SigHash sigHash, boolean anyoneCanPay) throws ScriptException {
// Verify the API user didn't try to do operations out of order.
checkState(!outputs.isEmpty(), "Attempting to sign tx without outputs.");
TransactionInput input = new TransactionInput(params, this, new byte[]{}, prevOut);
addInput(input);
Sha256Hash hash = hashForSignature(inputs.size() - 1, scriptPubKey, sigHash, anyoneCanPay);
ECKey.ECDSASignature ecSig = sigKey.sign(hash);
TransactionSignature txSig = new TransactionSignature(ecSig, sigHash, anyoneCanPay);
if (scriptPubKey.isSentToRawPubKey())
input.setScriptSig(ScriptBuilder.createInputScript(txSig));
else if (scriptPubKey.isSentToAddress())
input.setScriptSig(ScriptBuilder.createInputScript(txSig, sigKey));
else
throw new ScriptException("Don't know how to sign for this kind of scriptPubKey: " + scriptPubKey);
return input;
}
/**
* Same as {@link #addSignedInput(TransactionOutPoint, com.matthewmitchell.nubitsj.script.Script, ECKey, com.matthewmitchell.nubitsj.core.Transaction.SigHash, boolean)}
* but defaults to {@link SigHash#ALL} and "false" for the anyoneCanPay flag. This is normally what you want.
*/
public TransactionInput addSignedInput(TransactionOutPoint prevOut, Script scriptPubKey, ECKey sigKey) throws ScriptException {
return addSignedInput(prevOut, scriptPubKey, sigKey, SigHash.ALL, false);
}
/**
* Adds an input that points to the given output and contains a valid signature for it, calculated using the
* signing key.
*/
public TransactionInput addSignedInput(TransactionOutput output, ECKey signingKey) {
return addSignedInput(output.getOutPointFor(), output.getScriptPubKey(), signingKey);
}
/**
* Adds an input that points to the given output and contains a valid signature for it, calculated using the
* signing key.
*/
public TransactionInput addSignedInput(TransactionOutput output, ECKey signingKey, SigHash sigHash, boolean anyoneCanPay) {
return addSignedInput(output.getOutPointFor(), output.getScriptPubKey(), signingKey, sigHash, anyoneCanPay);
}
/**
* Removes all the outputs from this transaction.
* Note that this also invalidates the length attribute
*/
public void clearOutputs() {
unCache();
for (TransactionOutput output : outputs) {
output.setParent(null);
}
outputs.clear();
// You wanted to reserialize, right?
this.length = this.nubitsSerialize().length;
}
/**
* Adds the given output to this transaction. The output must be completely initialized. Returns the given output.
*/
public TransactionOutput addOutput(TransactionOutput to) {
unCache();
to.setParent(this);
outputs.add(to);
adjustLength(outputs.size(), to.length);
return to;
}
/**
* Creates an output based on the given address and value, adds it to this transaction, and returns the new output.
*/
public TransactionOutput addOutput(Coin value, Address address) {
return addOutput(new TransactionOutput(params, this, value, address));
}
/**
* Creates an output that pays to the given pubkey directly (no address) with the given value, adds it to this
* transaction, and returns the new output.
*/
public TransactionOutput addOutput(Coin value, ECKey pubkey) {
return addOutput(new TransactionOutput(params, this, value, pubkey));
}
/**
* Creates an output that pays to the given script. The address and key forms are specialisations of this method,
* you won't normally need to use it unless you're doing unusual things.
*/
public TransactionOutput addOutput(Coin value, Script script) {
return addOutput(new TransactionOutput(params, this, value, script.getProgram()));
}
/**
* Calculates a signature that is valid for being inserted into the input at the given position. This is simply
* a wrapper around calling {@link Transaction#hashForSignature(int, byte[], com.matthewmitchell.nubitsj.core.Transaction.SigHash, boolean)}
* followed by {@link ECKey#sign(Sha256Hash)} and then returning a new {@link TransactionSignature}. The key
* must be usable for signing as-is: if the key is encrypted it must be decrypted first external to this method.
*
* @param inputIndex Which input to calculate the signature for, as an index.
* @param key The private key used to calculate the signature.
* @param redeemScript Byte-exact contents of the scriptPubKey that is being satisified, or the P2SH redeem script.
* @param hashType Signing mode, see the enum for documentation.
* @param anyoneCanPay Signing mode, see the SigHash enum for documentation.
* @return A newly calculated signature object that wraps the r, s and sighash components.
*/
public synchronized TransactionSignature calculateSignature(int inputIndex, ECKey key,
byte[] redeemScript,
SigHash hashType, boolean anyoneCanPay) {
Sha256Hash hash = hashForSignature(inputIndex, redeemScript, hashType, anyoneCanPay);
return new TransactionSignature(key.sign(hash), hashType, anyoneCanPay);
}
/**
* Calculates a signature that is valid for being inserted into the input at the given position. This is simply
* a wrapper around calling {@link Transaction#hashForSignature(int, byte[], com.matthewmitchell.nubitsj.core.Transaction.SigHash, boolean)}
* followed by {@link ECKey#sign(Sha256Hash)} and then returning a new {@link TransactionSignature}.
*
* @param inputIndex Which input to calculate the signature for, as an index.
* @param key The private key used to calculate the signature.
* @param redeemScript The scriptPubKey that is being satisified, or the P2SH redeem script.
* @param hashType Signing mode, see the enum for documentation.
* @param anyoneCanPay Signing mode, see the SigHash enum for documentation.
* @return A newly calculated signature object that wraps the r, s and sighash components.
*/
public synchronized TransactionSignature calculateSignature(int inputIndex, ECKey key,
Script redeemScript,
SigHash hashType, boolean anyoneCanPay) {
Sha256Hash hash = hashForSignature(inputIndex, redeemScript.getProgram(), hashType, anyoneCanPay);
return new TransactionSignature(key.sign(hash), hashType, anyoneCanPay);
}
/**
* <p>Calculates a signature hash, that is, a hash of a simplified form of the transaction. How exactly the transaction
* is simplified is specified by the type and anyoneCanPay parameters.</p>
*
* <p>This is a low level API and when using the regular {@link Wallet} class you don't have to call this yourself.
* When working with more complex transaction types and contracts, it can be necessary. When signing a P2SH output
* the redeemScript should be the script encoded into the scriptSig field, for normal transactions, it's the
* scriptPubKey of the output you're signing for.</p>
*
* @param inputIndex input the signature is being calculated for. Tx signatures are always relative to an input.
* @param redeemScript the bytes that should be in the given input during signing.
* @param type Should be SigHash.ALL
* @param anyoneCanPay should be false.
*/
public synchronized Sha256Hash hashForSignature(int inputIndex, byte[] redeemScript,
SigHash type, boolean anyoneCanPay) {
byte sigHashType = (byte) TransactionSignature.calcSigHashValue(type, anyoneCanPay);
return hashForSignature(inputIndex, redeemScript, sigHashType);
}
/**
* <p>Calculates a signature hash, that is, a hash of a simplified form of the transaction. How exactly the transaction
* is simplified is specified by the type and anyoneCanPay parameters.</p>
*
* <p>This is a low level API and when using the regular {@link Wallet} class you don't have to call this yourself.
* When working with more complex transaction types and contracts, it can be necessary. When signing a P2SH output
* the redeemScript should be the script encoded into the scriptSig field, for normal transactions, it's the
* scriptPubKey of the output you're signing for.</p>
*
* @param inputIndex input the signature is being calculated for. Tx signatures are always relative to an input.
* @param redeemScript the script that should be in the given input during signing.
* @param type Should be SigHash.ALL
* @param anyoneCanPay should be false.
*/
public synchronized Sha256Hash hashForSignature(int inputIndex, Script redeemScript,
SigHash type, boolean anyoneCanPay) {
int sigHash = TransactionSignature.calcSigHashValue(type, anyoneCanPay);
return hashForSignature(inputIndex, redeemScript.getProgram(), (byte) sigHash);
}
/**
* This is required for signatures which use a sigHashType which cannot be represented using SigHash and anyoneCanPay
* See transaction c99c49da4c38af669dea436d3e73780dfdb6c1ecf9958baa52960e8baee30e73, which has sigHashType 0
*/
public synchronized Sha256Hash hashForSignature(int inputIndex, byte[] connectedScript, byte sigHashType) {
// The SIGHASH flags are used in the design of contracts, please see this page for a further understanding of
// the purposes of the code in this method:
//
// https://en.bitcoin.it/wiki/Contracts
try {
// Store all the input scripts and clear them in preparation for signing. If we're signing a fresh
// transaction that step isn't very helpful, but it doesn't add much cost relative to the actual
// EC math so we'll do it anyway.
//
// Also store the input sequence numbers in case we are clearing them with SigHash.NONE/SINGLE
byte[][] inputScripts = new byte[inputs.size()][];
long[] inputSequenceNumbers = new long[inputs.size()];
for (int i = 0; i < inputs.size(); i++) {
inputScripts[i] = inputs.get(i).getScriptBytes();
inputSequenceNumbers[i] = inputs.get(i).getSequenceNumber();
inputs.get(i).setScriptBytes(TransactionInput.EMPTY_ARRAY);
}
// This step has no purpose beyond being synchronized with the reference clients bugs. OP_CODESEPARATOR
// is a legacy holdover from a previous, broken design of executing scripts that shipped in Nubits 0.1.
// It was seriously flawed and would have let anyone take anyone elses money. Later versions switched to
// the design we use today where scripts are executed independently but share a stack. This left the
// OP_CODESEPARATOR instruction having no purpose as it was only meant to be used internally, not actually
// ever put into scripts. Deleting OP_CODESEPARATOR is a step that should never be required but if we don't
// do it, we could split off the main chain.
connectedScript = Script.removeAllInstancesOfOp(connectedScript, ScriptOpCodes.OP_CODESEPARATOR);
// Set the input to the script of its output. Satoshi does this but the step has no obvious purpose as
// the signature covers the hash of the prevout transaction which obviously includes the output script
// already. Perhaps it felt safer to him in some way, or is another leftover from how the code was written.
TransactionInput input = inputs.get(inputIndex);
input.setScriptBytes(connectedScript);
ArrayList<TransactionOutput> outputs = this.outputs;
if ((sigHashType & 0x1f) == (SigHash.NONE.ordinal() + 1)) {
// SIGHASH_NONE means no outputs are signed at all - the signature is effectively for a "blank cheque".
this.outputs = new ArrayList<TransactionOutput>(0);
// The signature isn't broken by new versions of the transaction issued by other parties.
for (int i = 0; i < inputs.size(); i++)
if (i != inputIndex)
inputs.get(i).setSequenceNumber(0);
} else if ((sigHashType & 0x1f) == (SigHash.SINGLE.ordinal() + 1)) {
// SIGHASH_SINGLE means only sign the output at the same index as the input (ie, my output).
if (inputIndex >= this.outputs.size()) {
// The input index is beyond the number of outputs, it's a buggy signature made by a broken
// Nubits implementation. The reference client also contains a bug in handling this case:
// any transaction output that is signed in this case will result in both the signed output
// and any future outputs to this public key being steal-able by anyone who has
// the resulting signature and the public key (both of which are part of the signed tx input).
// Put the transaction back to how we found it.
//
// TODO: Only allow this to happen if we are checking a signature, not signing a transactions
for (int i = 0; i < inputs.size(); i++) {
inputs.get(i).setScriptBytes(inputScripts[i]);
inputs.get(i).setSequenceNumber(inputSequenceNumbers[i]);
}
this.outputs = outputs;
// Satoshis bug is that SignatureHash was supposed to return a hash and on this codepath it
// actually returns the constant "1" to indicate an error, which is never checked for. Oops.
return Sha256Hash.wrap("0100000000000000000000000000000000000000000000000000000000000000");
}
// In SIGHASH_SINGLE the outputs after the matching input index are deleted, and the outputs before
// that position are "nulled out". Unintuitively, the value in a "null" transaction is set to -1.
this.outputs = new ArrayList<TransactionOutput>(this.outputs.subList(0, inputIndex + 1));
for (int i = 0; i < inputIndex; i++)
this.outputs.set(i, new TransactionOutput(params, this, Coin.NEGATIVE_SATOSHI, new byte[] {}));
// The signature isn't broken by new versions of the transaction issued by other parties.
for (int i = 0; i < inputs.size(); i++)
if (i != inputIndex)
inputs.get(i).setSequenceNumber(0);
}
ArrayList<TransactionInput> inputs = this.inputs;
if ((sigHashType & SIGHASH_ANYONECANPAY_VALUE) == SIGHASH_ANYONECANPAY_VALUE) {
// SIGHASH_ANYONECANPAY means the signature in the input is not broken by changes/additions/removals
// of other inputs. For example, this is useful for building assurance contracts.
this.inputs = new ArrayList<TransactionInput>();
this.inputs.add(input);
}
ByteArrayOutputStream bos = new UnsafeByteArrayOutputStream(length == UNKNOWN_LENGTH ? 256 : length + 4);
nubitsSerialize(bos);
// We also have to write a hash type (sigHashType is actually an unsigned char)
uint32ToByteStreamLE(0x000000ff & sigHashType, bos);
// Note that this is NOT reversed to ensure it will be signed correctly. If it were to be printed out
// however then we would expect that it is IS reversed.
Sha256Hash hash = Sha256Hash.twiceOf(bos.toByteArray());
bos.close();
// Put the transaction back to how we found it.
this.inputs = inputs;
for (int i = 0; i < inputs.size(); i++) {
inputs.get(i).setScriptBytes(inputScripts[i]);
inputs.get(i).setSequenceNumber(inputSequenceNumbers[i]);
}
this.outputs = outputs;
return hash;
} catch (IOException e) {
throw new RuntimeException(e); // Cannot happen.
}
}
@Override
protected void nubitsSerializeToStream(OutputStream stream) throws IOException {
uint32ToByteStreamLE(version, stream);
uint32ToByteStreamLE(time, stream);
stream.write(new VarInt(inputs.size()).encode());
for (TransactionInput in : inputs)
in.nubitsSerialize(stream);
stream.write(new VarInt(outputs.size()).encode());
for (TransactionOutput out : outputs)
out.nubitsSerialize(stream);
uint32ToByteStreamLE(lockTime, stream);
stream.write(coinType);
}
/**
* Transactions can have an associated lock time, specified either as a block height or in seconds since the
* UNIX epoch. A transaction is not allowed to be confirmed by miners until the lock time is reached, and
* since Nubits 0.8+ a transaction that did not end its lock period (non final) is considered to be non
* standard and won't be relayed or included in the memory pool either.
*/
public long getLockTime() {
maybeParse();
return lockTime;
}
/**
* Transactions can have an associated lock time, specified either as a block height or in seconds since the
* UNIX epoch. A transaction is not allowed to be confirmed by miners until the lock time is reached, and
* since Nubits 0.8+ a transaction that did not end its lock period (non final) is considered to be non
* standard and won't be relayed or included in the memory pool either.
*/
public void setLockTime(long lockTime) {
unCache();
boolean seqNumSet = false;
for (TransactionInput input : inputs) {
if (input.getSequenceNumber() != TransactionInput.NO_SEQUENCE) {
seqNumSet = true;
break;
}
}
if (lockTime != 0 && (!seqNumSet || inputs.isEmpty())) {
// At least one input must have a non-default sequence number for lock times to have any effect.
// For instance one of them can be set to zero to make this feature work.
log.warn("You are setting the lock time on a transaction but none of the inputs have non-default sequence numbers. This will not do what you expect!");
}
this.lockTime = lockTime;
}
/**
* @return the version
*/
public long getVersion() {
maybeParse();
return version;
}
/** Returns an unmodifiable view of all inputs. */
public List<TransactionInput> getInputs() {
maybeParse();
return Collections.unmodifiableList(inputs);
}
/** Returns an unmodifiable view of all outputs. */
public List<TransactionOutput> getOutputs() {
maybeParse();
return Collections.unmodifiableList(outputs);
}
public byte getCoinType() {
return coinType;
}
/**
* <p>Returns the list of transacion outputs, whether spent or unspent, that match a wallet by address or that are
* watched by a wallet, i.e., transaction outputs whose script's address is controlled by the wallet and transaction
* outputs whose script is watched by the wallet.</p>
*
* @param transactionBag The wallet that controls addresses and watches scripts.
* @return linked list of outputs relevant to the wallet in this transaction
*/
public List<TransactionOutput> getWalletOutputs(TransactionBag transactionBag){
maybeParse();
List<TransactionOutput> walletOutputs = new LinkedList<TransactionOutput>();
for (TransactionOutput o : outputs) {
if (!o.isMineOrWatched(transactionBag)) continue;
walletOutputs.add(o);
}
return walletOutputs;
}
/** Randomly re-orders the transaction outputs: good for privacy */
public void shuffleOutputs() {
maybeParse();
Collections.shuffle(outputs);
}
/** Same as getInputs().get(index). */
public TransactionInput getInput(long index) {
maybeParse();
return inputs.get((int)index);
}
/** Same as getOutputs().get(index) */
public TransactionOutput getOutput(long index) {
maybeParse();
return outputs.get((int)index);
}
/**
* Returns the confidence object for this transaction from the {@link com.matthewmitchell.nubitsj.core.TxConfidenceTable}
* referenced by the implicit {@link Context}.
*/
public TransactionConfidence getConfidence() {
return getConfidence(Context.get());
}
/**
* Returns the confidence object for this transaction from the {@link com.matthewmitchell.nubitsj.core.TxConfidenceTable}
* referenced by the given {@link Context}.
*/
public TransactionConfidence getConfidence(Context context) {
return getConfidence(context.getConfidenceTable());
}
/**
* Returns the confidence object for this transaction from the {@link com.matthewmitchell.nubitsj.core.TxConfidenceTable}
*/
public TransactionConfidence getConfidence(TxConfidenceTable table) {
if (confidence == null)
confidence = table.getOrCreate(getHash()) ;
return confidence;
}
/** Check if the transaction has a known confidence */
public boolean hasConfidence() {
return getConfidence().getConfidenceType() != TransactionConfidence.ConfidenceType.UNKNOWN;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Transaction other = (Transaction) o;
return getHash().equals(other.getHash());
}
@Override
public int hashCode() {
return getHash().hashCode();
}
/**
* Ensure object is fully parsed before invoking java serialization. The backing byte array
* is transient so if the object has parseLazy = true and hasn't invoked checkParse yet
* then data will be lost during serialization.
*/
private void writeObject(ObjectOutputStream out) throws IOException {
maybeParse();
out.defaultWriteObject();
}
/**
* Gets the count of regular SigOps in this transactions
*/
public int getSigOpCount() throws ScriptException {
maybeParse();
int sigOps = 0;
for (TransactionInput input : inputs)
sigOps += Script.getSigOpCount(input.getScriptBytes());
for (TransactionOutput output : outputs)
sigOps += Script.getSigOpCount(output.getScriptBytes());
return sigOps;
}
/**
* <p>Checks the transaction contents for sanity, in ways that can be done in a standalone manner.
* Does <b>not</b> perform all checks on a transaction such as whether the inputs are already spent.
* Specifically this method verifies:</p>
*
* <ul>
* <li>That there is at least one input and output.</li>
* <li>That the serialized size is not larger than the max block size.</li>
* <li>That no outputs have negative value.</li>
* <li>That the outputs do not sum to larger than the max allowed quantity of coin in the system.</li>
* <li>If the tx is a coinbase tx, the coinbase scriptSig size is within range. Otherwise that there are no
* coinbase inputs in the tx.</li>
* </ul>
*
* @throws VerificationException
*/
public void verify() throws VerificationException {
maybeParse();
if (inputs.size() == 0 || outputs.size() == 0)
throw new VerificationException.EmptyInputsOrOutputs();
if (this.getMessageSize() > Block.MAX_BLOCK_SIZE)
throw new VerificationException.LargerThanMaxBlockSize();
Coin valueOut = Coin.ZERO;
HashSet<TransactionOutPoint> outpoints = new HashSet<TransactionOutPoint>();
for (TransactionInput input : inputs) {
if (outpoints.contains(input.getOutpoint()))
throw new VerificationException.DuplicatedOutPoint();
outpoints.add(input.getOutpoint());
}
try {
for (TransactionOutput output : outputs) {
if (output.getValue().signum() < 0) // getValue() can throw IllegalStateException
throw new VerificationException.NegativeValueOutput();
valueOut = valueOut.add(output.getValue());
// Duplicate the MAX_MONEY check from Coin.add() in case someone accidentally removes it.
if (valueOut.compareTo(NetworkParameters.MAX_MONEY) > 0)
throw new IllegalArgumentException();
}
} catch (IllegalStateException e) {
throw new VerificationException.ExcessiveValue();
} catch (IllegalArgumentException e) {
throw new VerificationException.ExcessiveValue();
}
if (isCoinBase()) {
if (inputs.get(0).getScriptBytes().length > 100)
throw new VerificationException.CoinbaseScriptSizeOutOfRange();
} else {
for (TransactionInput input : inputs)
if (input.isCoinBase())
throw new VerificationException.UnexpectedCoinbaseInput();
}
}
/**
* <p>A transaction is time locked if at least one of its inputs is non-final and it has a lock time</p>
*
* <p>To check if this transaction is final at a given height and time, see {@link Transaction#isFinal(int, long)}
* </p>
*/
public boolean isTimeLocked() {
if (getLockTime() == 0)
return false;
for (TransactionInput input : getInputs())
if (input.hasSequence())
return true;
return false;
}
/**
* <p>Returns true if this transaction is considered finalized and can be placed in a block. Non-finalized
* transactions won't be included by miners and can be replaced with newer versions using sequence numbers.
* This is useful in certain types of <a href="http://en.bitcoin.it/wiki/Contracts">contracts</a>, such as
* micropayment channels.</p>
*
* <p>Note that currently the replacement feature is disabled in the Satoshi client and will need to be
* re-activated before this functionality is useful.</p>
*/
public boolean isFinal(int height, long blockTimeSeconds) {
long time = getLockTime();
return time < (time < LOCKTIME_THRESHOLD ? height : blockTimeSeconds) || !isTimeLocked();
}
/**
* Returns either the lock time as a date, if it was specified in seconds, or an estimate based on the time in
* the current head block if it was specified as a block time.
*/
public Date estimateLockTime(AbstractBlockChain chain) {
if (lockTime < LOCKTIME_THRESHOLD)
return chain.estimateBlockTime((int)getLockTime());
else
return new Date(getLockTime()*1000);
}
/**
* Returns the purpose for which this transaction was created. See the javadoc for {@link Purpose} for more
* information on the point of this field and what it can be.
*/
public Purpose getPurpose() {
return purpose;
}
/**
* Marks the transaction as being created for the given purpose. See the javadoc for {@link Purpose} for more
* information on the point of this field and what it can be.
*/
public void setPurpose(Purpose purpose) {
this.purpose = purpose;
}
/**
* Getter for {@link #exchangeRate}.
*/
@Nullable
public ExchangeRate getExchangeRate() {
return exchangeRate;
}
/**
* Setter for {@link #exchangeRate}.
*/
public void setExchangeRate(ExchangeRate exchangeRate) {
this.exchangeRate = exchangeRate;
}
/**
* Returns the transaction {@link #memo}.
*/
public String getMemo() {
return memo;
}
/**
* Set the transaction {@link #memo}. It can be used to record the memo of the payment request that initiated the
* transaction.
*/
public void setMemo(String memo) {
this.memo = memo;
}
}