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/*
* Copyright 2019 by Dash Core Group
*
* 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 org.bitcoinj.wallet;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import org.bitcoinj.core.Address;
import org.bitcoinj.core.ECKey;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.core.Sha256Hash;
import org.bitcoinj.crypto.*;
import org.bitcoinj.evolution.EvolutionContact;
import org.bitcoinj.script.Script;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.security.SecureRandom;
import java.util.*;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static org.bitcoinj.wallet.FriendKeyChain.*;
public class FriendKeyChainGroup extends KeyChainGroup {
private static final Logger log = LoggerFactory.getLogger(FriendKeyChainGroup.class);
/**
* Builder for {@link FriendKeyChainGroup}. Use {@link FriendKeyChainGroup#builder(NetworkParameters)} to acquire an instance.
*/
public static class Builder {
private final NetworkParameters params;
private final KeyChainGroupStructure structure;
private final List chains = new LinkedList<>();
private int lookaheadSize = -1, lookaheadThreshold = -1;
private Builder(NetworkParameters params, KeyChainGroupStructure structure) {
this.params = params;
this.structure = structure;
}
/**
* Add chain from a random source.
* In the case of P2PKH, just a P2PKH chain is created and activated which is then the default chain for fresh
* addresses. It can be upgraded to P2WPKH later.
* In the case of P2WPKH, both a P2PKH and a P2WPKH chain are created and activated, the latter being the default
* chain. This behaviour will likely be changed with bitcoinj 0.16 such that only a P2WPKH chain is created and
* activated.
* @param outputScriptType type of addresses (aka output scripts) to generate for receiving
*/
public FriendKeyChainGroup.Builder fromRandom(Script.ScriptType outputScriptType) {
DeterministicSeed seed = new DeterministicSeed(new SecureRandom(),
DeterministicSeed.DEFAULT_SEED_ENTROPY_BITS, "");
fromSeed(seed, outputScriptType);
return this;
}
/**
* Add chain from a given seed.
* In the case of P2PKH, just a P2PKH chain is created and activated which is then the default chain for fresh
* addresses. It can be upgraded to P2WPKH later.
* In the case of P2WPKH, both a P2PKH and a P2WPKH chain are created and activated, the latter being the default
* chain. This behaviour will likely be changed with bitcoinj 0.16 such that only a P2WPKH chain is created and
* activated.
* @param seed deterministic seed to derive all keys from
* @param outputScriptType type of addresses (aka output scripts) to generate for receiving
*/
public FriendKeyChainGroup.Builder fromSeed(DeterministicSeed seed, Script.ScriptType outputScriptType) {
if (outputScriptType == Script.ScriptType.P2PKH) {
DeterministicKeyChain chain = DeterministicKeyChain.builder().seed(seed)
.outputScriptType(Script.ScriptType.P2PKH)
.accountPath(structure.accountPathFor(Script.ScriptType.P2PKH)).build();
this.chains.clear();
this.chains.add(chain);
} else {
throw new IllegalArgumentException(outputScriptType.toString());
}
return this;
}
/**
* Add a single chain.
* @param chain to add
*/
public FriendKeyChainGroup.Builder addChain(DeterministicKeyChain chain) {
this.chains.add(chain);
return this;
}
/**
* Add multiple chains.
* @param chains to add
*/
public FriendKeyChainGroup.Builder chains(List chains) {
this.chains.clear();
this.chains.addAll(chains);
return this;
}
/**
* Set a custom lookahead size for all deterministic chains
* @param lookaheadSize lookahead size
*/
public FriendKeyChainGroup.Builder lookaheadSize(int lookaheadSize) {
this.lookaheadSize = lookaheadSize;
return this;
}
/**
* Set a custom lookahead threshold for all deterministic chains
* @param lookaheadThreshold lookahead threshold
*/
public FriendKeyChainGroup.Builder lookaheadThreshold(int lookaheadThreshold) {
this.lookaheadThreshold = lookaheadThreshold;
return this;
}
public FriendKeyChainGroup build() {
return new FriendKeyChainGroup(params, null, chains, lookaheadSize, lookaheadThreshold, null, null);
}
}
public static FriendKeyChainGroup.Builder friendlybuilder(NetworkParameters params) {
return new Builder(params, KeyChainGroupStructure.DEFAULT);
}
HashMap, DeterministicKey> currentContactKeys;
protected FriendKeyChainGroup(NetworkParameters params, @Nullable BasicKeyChain basicKeyChain, List chains,
int lookAheadSize, int lookAheadThreshold,
@Nullable HashMap, DeterministicKey> currentKeys, @Nullable KeyCrypter crypter) {
super(params, basicKeyChain, chains, lookAheadSize, lookAheadThreshold,null, crypter);
currentContactKeys = currentKeys != null ? currentKeys :
new HashMap, DeterministicKey>();
}
public FriendKeyChain getFriendKeyChain(Sha256Hash myBlockchainUserId, int account, Sha256Hash theirBlockchainUserId, int friendAccountReference, FriendKeyChain.KeyChainType type) {
Preconditions.checkNotNull(theirBlockchainUserId);
Preconditions.checkArgument(!theirBlockchainUserId.isZero());
Sha256Hash to, from;
int accountReference;
if(type == FriendKeyChain.KeyChainType.RECEIVING_CHAIN)
{
from = theirBlockchainUserId;
to = myBlockchainUserId;
accountReference = account;
} else {
to = theirBlockchainUserId;
from = myBlockchainUserId;
accountReference = friendAccountReference;
}
for(DeterministicKeyChain chain : chains) {
ImmutableList accountPath = chain.getAccountPath();
if(accountPath.get(PATH_INDEX_ACCOUNT).equals(new ChildNumber(accountReference, true)) &&
accountPath.get(PATH_INDEX_TO_ID).equals(new ExtendedChildNumber(to)) &&
accountPath.get(PATH_INDEX_FROM_ID).equals(new ExtendedChildNumber(from)))
return (FriendKeyChain)chain;
}
return null;
}
@Deprecated
public FriendKeyChain getFriendKeyChain(Sha256Hash myBlockchainUserId, Sha256Hash theirBlockchainUserId, FriendKeyChain.KeyChainType type ) {
return getFriendKeyChain(myBlockchainUserId, 0, theirBlockchainUserId, 0, type);
}
public FriendKeyChain getFriendKeyChain(EvolutionContact contact, FriendKeyChain.KeyChainType type ) {
return getFriendKeyChain(contact.getEvolutionUserId(), contact.getUserAccount(), contact.getFriendUserId(), contact.getFriendAccountReference(), type);
}
@Override
public void addAndActivateHDChain(DeterministicKeyChain chain) {
if(chain instanceof FriendKeyChain)
super.addAndActivateHDChain(chain);
else throw new IllegalArgumentException("chain is not of type FriendKeyChain");
}
public boolean hasKeyChains() { return !chains.isEmpty(); }
static FriendKeyChainGroup fromProtobufUnencrypted(NetworkParameters params, List keys, KeyChainType type) throws UnreadableWalletException {
return fromProtobufUnencrypted(params, keys, new DefaultKeyChainFactory(), type);
}
public static FriendKeyChainGroup fromProtobufUnencrypted(NetworkParameters params, List keys, KeyChainFactory factory, KeyChainType type) throws UnreadableWalletException {
BasicKeyChain basicKeyChain = BasicKeyChain.fromProtobufUnencrypted(keys);
List chains = DeterministicKeyChain.fromProtobuf(keys, null, factory);
for(DeterministicKeyChain chain : chains) {
Preconditions.checkState(chain instanceof FriendKeyChain);
}
HashMap, DeterministicKey> currentKeys = null;
int lookaheadSize = -1, lookaheadThreshold = -1;
if (!chains.isEmpty()) {
DeterministicKeyChain activeChain = chains.get(chains.size() - 1);
lookaheadSize = activeChain.getLookaheadSize();
lookaheadThreshold = activeChain.getLookaheadThreshold();
currentKeys = createCurrentContactKeysMap(chains);
}
return new FriendKeyChainGroup(params, basicKeyChain, chains, lookaheadSize, lookaheadThreshold, currentKeys, null);
}
static FriendKeyChainGroup fromProtobufEncrypted(NetworkParameters params, List keys, KeyCrypter crypter, KeyChainType type) throws UnreadableWalletException {
return fromProtobufEncrypted(params, keys, crypter, new DefaultKeyChainFactory(), type);
}
public static FriendKeyChainGroup fromProtobufEncrypted(NetworkParameters params, List keys, KeyCrypter crypter, KeyChainFactory factory, KeyChainType type) throws UnreadableWalletException {
checkNotNull(crypter);
BasicKeyChain basicKeyChain = BasicKeyChain.fromProtobufEncrypted(keys, crypter);
List chains = DeterministicKeyChain.fromProtobuf(keys, crypter, factory);
for(DeterministicKeyChain chain : chains) {
Preconditions.checkState(chain instanceof FriendKeyChain);
}
HashMap, DeterministicKey> currentKeys = null;
int lookaheadSize = -1, lookaheadThreshold = -1;
if (!chains.isEmpty()) {
DeterministicKeyChain activeChain = chains.get(chains.size() - 1);
lookaheadSize = activeChain.getLookaheadSize();
lookaheadThreshold = activeChain.getLookaheadThreshold();
currentKeys = createCurrentContactKeysMap(chains);
}
return new FriendKeyChainGroup(params, basicKeyChain, chains, lookaheadSize, lookaheadThreshold, currentKeys, crypter);
}
/**
* Returns a key that hasn't been seen in a transaction yet, and which is suitable for displaying in a wallet
* user interface as "a convenient key to receive funds on" when the purpose parameter is
* {@link KeyChain.KeyPurpose#RECEIVE_FUNDS}. The returned key is stable until
* it's actually seen in a pending or confirmed transaction, at which point this method will start returning
* a different key (for each purpose independently).
* This method is not supposed to be used for married keychains and will throw UnsupportedOperationException if
* the active chain is married.
* For married keychains use {@link #currentAddress(KeyChain.KeyPurpose)}
* to get a proper P2SH address
*/
public DeterministicKey currentKey(EvolutionContact contact, FriendKeyChain.KeyChainType type) {
DeterministicKeyChain chain = getFriendKeyChain(contact, type);
if (chain.isMarried()) {
throw new UnsupportedOperationException("Key is not suitable to receive coins for married keychains." +
" Use freshAddress to get P2SH address instead");
}
ImmutableList accountPath = chain.getAccountPath();
DeterministicKey current = currentContactKeys.get(accountPath);
if (current == null) {
current = freshKey(contact, type);
currentContactKeys.put(accountPath, current);
}
return current;
}
/**
* Returns address for a {@link #currentKey(org.bitcoinj.evolution.EvolutionContact, KeyChainType)}
*/
public Address currentAddress(EvolutionContact contact, FriendKeyChain.KeyChainType type, KeyChain.KeyPurpose purpose) {
DeterministicKeyChain chain = getFriendKeyChain(contact, type);
if (chain.isMarried()) {
Address current = currentAddresses.get(purpose);
if (current == null) {
current = freshAddress(purpose);
currentAddresses.put(purpose, current);
}
return current;
} else {
return Address.fromKey(params, currentKey(purpose));
}
}
/**
* Returns a key that has not been returned by this method before (fresh). You can think of this as being
* a newly created key, although the notion of "create" is not really valid for a
* {@link DeterministicKeyChain}. The returned key is suitable for being put
* into a receive coins wizard type UI. You should use this when the user is definitely going to hand this key out
* to someone who wishes to send money.
* This method is not supposed to be used for married keychains and will throw UnsupportedOperationException if
* the active chain is married.
* For married keychains use {@link #freshAddress(org.bitcoinj.evolution.EvolutionContact, org.bitcoinj.wallet.FriendKeyChain.KeyChainType)}
* to get a proper P2SH address
*/
public DeterministicKey freshKey(EvolutionContact contact, KeyChainType type) {
return freshKeys(contact, type, 1).get(0);
}
/**
* Returns a key/s that have not been returned by this method before (fresh). You can think of this as being
* newly created key/s, although the notion of "create" is not really valid for a
* {@link DeterministicKeyChain}. You should use this when the user is definitely going to hand this key out
* to someone who wishes to send money.
* This method is not supposed to be used for married keychains and will throw UnsupportedOperationException if
* the active chain is married.
* For married keychains use {@link #freshAddress(KeyChain.KeyPurpose)}
* to get a proper P2SH address
*/
public List freshKeys(EvolutionContact contact, KeyChainType type, int numberOfKeys) {
DeterministicKeyChain chain = getFriendKeyChain(contact, type);
if (chain.isMarried()) {
throw new UnsupportedOperationException("Key is not suitable to receive coins for married keychains." +
" Use freshAddress to get P2SH address instead");
}
return chain.getKeys(KeyPurpose.RECEIVE_FUNDS, numberOfKeys); // Always returns the next key along the key chain.
}
/**
* Returns address for a {@link #freshKey(org.bitcoinj.evolution.EvolutionContact, org.bitcoinj.wallet.FriendKeyChain.KeyChainType)}
*/
public Address freshAddress(EvolutionContact contact, FriendKeyChain.KeyChainType type) {
DeterministicKeyChain chain = getFriendKeyChain(contact, type);
if (chain.isMarried()) {
Script outputScript = chain.freshOutputScript(KeyPurpose.RECEIVE_FUNDS);
checkState(outputScript.isPayToScriptHash()); // Only handle P2SH for now
Address freshAddress = Address.fromP2SHScript(params, outputScript);
maybeLookaheadScripts();
currentAddresses.put(KeyPurpose.RECEIVE_FUNDS, freshAddress);
return freshAddress;
} else {
return Address.fromKey(params, freshKey(contact, type));
}
}
protected static HashMap, DeterministicKey> createCurrentContactKeysMap(List chains) {
HashMap, DeterministicKey> currentKeys = new HashMap, DeterministicKey>(chains.size());
for(DeterministicKeyChain chain : chains) {
FriendKeyChain contactChain = (FriendKeyChain)chain;
// assuming that only RECEIVE and CHANGE keys are being used at the moment, we will treat latest issued external key
// as current RECEIVE key and latest issued internal key as CHANGE key. This should be changed as soon as other
// kinds of KeyPurpose are introduced.
if (contactChain.getIssuedExternalKeys() > 0) {
DeterministicKey currentExternalKey = contactChain.getKeyByPath(
HDUtils.append(
contactChain.getAccountPath(),
new ChildNumber(contactChain.getIssuedExternalKeys() - 1)));
currentKeys.put(chain.getAccountPath(), currentExternalKey);
}
}
return currentKeys;
}
/** If the given key is "current", advance the current key to a new one. */
protected void maybeMarkCurrentKeyAsUsed(DeterministicKey key) {
// It's OK for currentKeys to be empty here: it means we're a married wallet and the key may be a part of a
// rotating chain.
for (Map.Entry, DeterministicKey> entry : currentContactKeys.entrySet()) {
if (entry.getValue() != null && entry.getValue().equals(key)) {
log.info("Marking key as used: {}", key);
currentContactKeys.put(entry.getKey(), freshKey(new EvolutionContact(entry.getKey(), getKeyChainType() == KeyChainType.RECEIVING_CHAIN), getKeyChainType()));
return;
}
}
}
protected KeyChainType getKeyChainType() {
return chains.size() > 0 ? ((FriendKeyChain)chains.get(0)).type : null;
}
public EvolutionContact getFriendFromPublicKeyHash(byte [] pubKeyHash) {
ECKey key = findKeyFromPubKeyHash(pubKeyHash, Script.ScriptType.P2PKH);
if (key instanceof DeterministicKey) {
ImmutableList path = ((DeterministicKey)key).getPath();
Sha256Hash from = Sha256Hash.wrap(((ExtendedChildNumber)path.get(PATH_INDEX_FROM_ID)).bi());
Sha256Hash to = Sha256Hash.wrap(((ExtendedChildNumber)path.get(PATH_INDEX_TO_ID)).bi());
return new EvolutionContact(from, to);
}
return null;
}
}