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DefaultRiskAnalysis: Consider transactions that opt into replace-by-fee at risk for double spending.

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This commit is contained in:
Andreas Schildbach 2015-11-29 12:33:47 +01:00
parent 786a11187e
commit 54780491fc
2 changed files with 36 additions and 21 deletions
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7
core/src/main/java/org/bitcoinj/wallet/DefaultRiskAnalysis.java
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@ -84,6 +84,12 @@ public class DefaultRiskAnalysis implements RiskAnalysis {
if (tx.getConfidence().getSource() == TransactionConfidence.Source.SELF)
return Result.OK;
// We consider transactions that opt into replace-by-fee at risk of double spending.
if (tx.isOptInFullRBF()) {
nonFinal = tx;
return Result.NON_FINAL;
}
if (wallet == null)
return null;
@ -103,6 +109,7 @@ public class DefaultRiskAnalysis implements RiskAnalysis {
return Result.NON_FINAL;
}
}
return Result.OK;
}

50
core/src/test/java/org/bitcoinj/wallet/DefaultRiskAnalysisTest.java
View file

@ -22,6 +22,7 @@ import org.bitcoinj.core.*;
import org.bitcoinj.crypto.*;
import org.bitcoinj.params.*;
import org.bitcoinj.script.*;
import org.bitcoinj.testing.FakeTxBuilder;
import org.bitcoinj.wallet.DefaultRiskAnalysis.*;
import org.junit.*;
@ -54,6 +55,16 @@ public class DefaultRiskAnalysisTest {
};
}
@Test(expected = IllegalStateException.class)
public void analysisCantBeUsedTwice() {
Transaction tx = new Transaction(params);
DefaultRiskAnalysis analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.OK, analysis.analyze());
assertNull(analysis.getNonFinal());
// Verify we can't re-use a used up risk analysis.
analysis.analyze();
}
@Test
public void nonFinal() throws Exception {
// Verify that just having a lock time in the future is not enough to be considered risky (it's still final).
@ -61,32 +72,20 @@ public class DefaultRiskAnalysisTest {
TransactionInput input = tx.addInput(params.getGenesisBlock().getTransactions().get(0).getOutput(0));
tx.addOutput(COIN, key1);
tx.setLockTime(TIMESTAMP + 86400);
{
DefaultRiskAnalysis analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.OK, analysis.analyze());
assertNull(analysis.getNonFinal());
// Verify we can't re-use a used up risk analysis.
try {
analysis.analyze();
fail();
} catch (IllegalStateException e) {}
}
DefaultRiskAnalysis analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.OK, analysis.analyze());
assertNull(analysis.getNonFinal());
// Set a sequence number on the input to make it genuinely non-final. Verify it's risky.
input.setSequenceNumber(1);
{
DefaultRiskAnalysis analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.NON_FINAL, analysis.analyze());
assertEquals(tx, analysis.getNonFinal());
}
input.setSequenceNumber(TransactionInput.NO_SEQUENCE - 1);
analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.NON_FINAL, analysis.analyze());
assertEquals(tx, analysis.getNonFinal());
// If the lock time is the current block, it's about to become final and we consider it non-risky.
tx.setLockTime(1000);
{
DefaultRiskAnalysis analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.OK, analysis.analyze());
}
analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.OK, analysis.analyze());
}
@Test
@ -223,4 +222,13 @@ public class DefaultRiskAnalysisTest {
tx.addOutput(Coin.CENT, ScriptBuilder.createOpReturnScript("hi there".getBytes()));
assertEquals(RiskAnalysis.Result.OK, DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS).analyze());
}
@Test
public void optInFullRBF() throws Exception {
Transaction tx = FakeTxBuilder.createFakeTx(params);
tx.getInput(0).setSequenceNumber(TransactionInput.NO_SEQUENCE - 2);
DefaultRiskAnalysis analysis = DefaultRiskAnalysis.FACTORY.create(wallet, tx, NO_DEPS);
assertEquals(RiskAnalysis.Result.NON_FINAL, analysis.analyze());
assertEquals(tx, analysis.getNonFinal());
}
}