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find signing nodes and keystores from transaction

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This commit is contained in:
Craig Raw 2021-01-11 12:26:28 +02:00
parent 4da2c024d4
commit 3e91bdb46c
1 changed files with 96 additions and 0 deletions
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96
src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
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@ -16,6 +16,7 @@ import java.util.*;
import java.util.function.Function;
import java.util.stream.Collectors;
import static com.sparrowwallet.drongo.protocol.ScriptType.*;
import static com.sparrowwallet.drongo.protocol.Transaction.WITNESS_SCALE_FACTOR;
public class Wallet {
@ -646,6 +647,101 @@ public class Wallet {
return true;
}
public boolean canSign(Transaction transaction) {
return isValid() && !getSigningNodes(transaction).isEmpty();
}
/**
* Determines which nodes in this wallet can sign which inputs in the provided transaction
*
* @param transaction The transaction to be signed, or that has been signed
* @return A map if the PSBT inputs and the nodes that can sign them
*/
public Map<TransactionInput, WalletNode> getSigningNodes(Transaction transaction) {
Map<TransactionInput, WalletNode> signingNodes = new LinkedHashMap<>();
Map<Script, WalletNode> walletOutputScripts = getWalletOutputScripts();
for(TransactionInput txInput : transaction.getInputs()) {
BlockTransaction blockTransaction = transactions.get(txInput.getOutpoint().getHash());
if(blockTransaction != null && blockTransaction.getTransaction().getOutputs().size() > txInput.getOutpoint().getIndex()) {
TransactionOutput utxo = blockTransaction.getTransaction().getOutputs().get((int)txInput.getOutpoint().getIndex());
if(utxo != null) {
Script scriptPubKey = utxo.getScript();
WalletNode signingNode = walletOutputScripts.get(scriptPubKey);
if(signingNode != null) {
signingNodes.put(txInput, signingNode);
}
}
}
}
return signingNodes;
}
/**
* Determines which keystores have signed a transaction
*
* @param transaction The signed transaction
* @return A map keyed with the transactionInput mapped to a map of the signatures and associated keystores that signed it
*/
public Map<TransactionInput, Map<TransactionSignature, Keystore>> getSignedKeystores(Transaction transaction) {
Map<TransactionInput, WalletNode> signingNodes = getSigningNodes(transaction);
Map<TransactionInput, Map<TransactionSignature, Keystore>> signedKeystores = new LinkedHashMap<>();
for(TransactionInput txInput : signingNodes.keySet()) {
WalletNode walletNode = signingNodes.get(txInput);
Map<ECKey, Keystore> keystoreKeysForNode = getKeystores().stream().collect(Collectors.toMap(keystore -> keystore.getPubKey(walletNode), Function.identity(),
(u, v) -> { throw new IllegalStateException("Duplicate keys from different keystores for node " + walletNode.getDerivationPath()); },
LinkedHashMap::new));
Map<ECKey, TransactionSignature> keySignatureMap = new LinkedHashMap<>();
BlockTransaction blockTransaction = transactions.get(txInput.getOutpoint().getHash());
if(blockTransaction != null && blockTransaction.getTransaction().getOutputs().size() > txInput.getOutpoint().getIndex()) {
TransactionOutput spentTxo = blockTransaction.getTransaction().getOutputs().get((int)txInput.getOutpoint().getIndex());
Script signingScript = getSigningScript(txInput, spentTxo);
Sha256Hash hash = txInput.hasWitness() ? transaction.hashForWitnessSignature(txInput.getIndex(), signingScript, spentTxo.getValue(), SigHash.ALL) : transaction.hashForLegacySignature(txInput.getIndex(), signingScript, SigHash.ALL);
for(ECKey sigPublicKey : keystoreKeysForNode.keySet()) {
for(TransactionSignature signature : txInput.hasWitness() ? txInput.getWitness().getSignatures() : txInput.getScriptSig().getSignatures()) {
if(sigPublicKey.verify(hash, signature)) {
keySignatureMap.put(sigPublicKey, signature);
}
}
}
keystoreKeysForNode.keySet().retainAll(keySignatureMap.keySet());
Map<TransactionSignature, Keystore> inputSignatureKeystores = new LinkedHashMap<>();
for(ECKey signingKey : keystoreKeysForNode.keySet()) {
inputSignatureKeystores.put(keySignatureMap.get(signingKey), keystoreKeysForNode.get(signingKey));
}
signedKeystores.put(txInput, inputSignatureKeystores);
}
}
return signedKeystores;
}
private Script getSigningScript(TransactionInput txInput, TransactionOutput spentTxo) {
Script signingScript = spentTxo.getScript();
if(P2SH.isScriptType(signingScript)) {
signingScript = txInput.getScriptSig().getFirstNestedScript();
}
if(P2WPKH.isScriptType(signingScript)) {
signingScript = ScriptType.P2PKH.getOutputScript(signingScript.getPubKeyHash());
} else if(P2WSH.isScriptType(signingScript) && txInput.hasWitness()) {
signingScript = txInput.getWitness().getWitnessScript();
}
return signingScript;
}
public boolean canSign(PSBT psbt) {
return isValid() && !getSigningNodes(psbt).isEmpty();
}