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|
// Copyright (c) 2011-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <qt/walletmodel.h>
#include <qt/addresstablemodel.h>
#include <qt/clientmodel.h>
#include <qt/guiconstants.h>
#include <qt/guiutil.h>
#include <qt/optionsmodel.h>
#include <qt/paymentserver.h>
#include <qt/recentrequeststablemodel.h>
#include <qt/sendcoinsdialog.h>
#include <qt/transactiontablemodel.h>
#include <common/args.h> // for GetBoolArg
#include <interfaces/handler.h>
#include <interfaces/node.h>
#include <key_io.h>
#include <node/interface_ui.h>
#include <psbt.h>
#include <util/translation.h>
#include <wallet/coincontrol.h>
#include <wallet/wallet.h> // for CRecipient
#include <stdint.h>
#include <functional>
#include <QDebug>
#include <QMessageBox>
#include <QSet>
#include <QTimer>
using wallet::CCoinControl;
using wallet::CRecipient;
using wallet::DEFAULT_DISABLE_WALLET;
WalletModel::WalletModel(std::unique_ptr<interfaces::Wallet> wallet, ClientModel& client_model, const PlatformStyle *platformStyle, QObject *parent) :
QObject(parent),
m_wallet(std::move(wallet)),
m_client_model(&client_model),
m_node(client_model.node()),
optionsModel(client_model.getOptionsModel()),
timer(new QTimer(this))
{
fHaveWatchOnly = m_wallet->haveWatchOnly();
addressTableModel = new AddressTableModel(this);
transactionTableModel = new TransactionTableModel(platformStyle, this);
recentRequestsTableModel = new RecentRequestsTableModel(this);
subscribeToCoreSignals();
}
WalletModel::~WalletModel()
{
unsubscribeFromCoreSignals();
}
void WalletModel::startPollBalance()
{
// Update the cached balance right away, so every view can make use of it,
// so them don't need to waste resources recalculating it.
pollBalanceChanged();
// This timer will be fired repeatedly to update the balance
// Since the QTimer::timeout is a private signal, it cannot be used
// in the GUIUtil::ExceptionSafeConnect directly.
connect(timer, &QTimer::timeout, this, &WalletModel::timerTimeout);
GUIUtil::ExceptionSafeConnect(this, &WalletModel::timerTimeout, this, &WalletModel::pollBalanceChanged);
timer->start(MODEL_UPDATE_DELAY);
}
void WalletModel::setClientModel(ClientModel* client_model)
{
m_client_model = client_model;
if (!m_client_model) timer->stop();
}
void WalletModel::updateStatus()
{
EncryptionStatus newEncryptionStatus = getEncryptionStatus();
if(cachedEncryptionStatus != newEncryptionStatus) {
Q_EMIT encryptionStatusChanged();
}
}
void WalletModel::pollBalanceChanged()
{
// Avoid recomputing wallet balances unless a TransactionChanged or
// BlockTip notification was received.
if (!fForceCheckBalanceChanged && m_cached_last_update_tip == getLastBlockProcessed()) return;
// Try to get balances and return early if locks can't be acquired. This
// avoids the GUI from getting stuck on periodical polls if the core is
// holding the locks for a longer time - for example, during a wallet
// rescan.
interfaces::WalletBalances new_balances;
uint256 block_hash;
if (!m_wallet->tryGetBalances(new_balances, block_hash)) {
return;
}
if (fForceCheckBalanceChanged || block_hash != m_cached_last_update_tip) {
fForceCheckBalanceChanged = false;
// Balance and number of transactions might have changed
m_cached_last_update_tip = block_hash;
checkBalanceChanged(new_balances);
if(transactionTableModel)
transactionTableModel->updateConfirmations();
}
}
void WalletModel::checkBalanceChanged(const interfaces::WalletBalances& new_balances)
{
if (new_balances.balanceChanged(m_cached_balances)) {
m_cached_balances = new_balances;
Q_EMIT balanceChanged(new_balances);
}
}
interfaces::WalletBalances WalletModel::getCachedBalance() const
{
return m_cached_balances;
}
void WalletModel::updateTransaction()
{
// Balance and number of transactions might have changed
fForceCheckBalanceChanged = true;
}
void WalletModel::updateAddressBook(const QString &address, const QString &label,
bool isMine, wallet::AddressPurpose purpose, int status)
{
if(addressTableModel)
addressTableModel->updateEntry(address, label, isMine, purpose, status);
}
void WalletModel::updateWatchOnlyFlag(bool fHaveWatchonly)
{
fHaveWatchOnly = fHaveWatchonly;
Q_EMIT notifyWatchonlyChanged(fHaveWatchonly);
}
bool WalletModel::validateAddress(const QString& address) const
{
return IsValidDestinationString(address.toStdString());
}
WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransaction &transaction, const CCoinControl& coinControl)
{
CAmount total = 0;
bool fSubtractFeeFromAmount = false;
QList<SendCoinsRecipient> recipients = transaction.getRecipients();
std::vector<CRecipient> vecSend;
if(recipients.empty())
{
return OK;
}
QSet<QString> setAddress; // Used to detect duplicates
int nAddresses = 0;
// Pre-check input data for validity
for (const SendCoinsRecipient &rcp : recipients)
{
if (rcp.fSubtractFeeFromAmount)
fSubtractFeeFromAmount = true;
{ // User-entered bitcoin address / amount:
if(!validateAddress(rcp.address))
{
return InvalidAddress;
}
if(rcp.amount <= 0)
{
return InvalidAmount;
}
setAddress.insert(rcp.address);
++nAddresses;
CRecipient recipient{DecodeDestination(rcp.address.toStdString()), rcp.amount, rcp.fSubtractFeeFromAmount};
vecSend.push_back(recipient);
total += rcp.amount;
}
}
if(setAddress.size() != nAddresses)
{
return DuplicateAddress;
}
// If no coin was manually selected, use the cached balance
// Future: can merge this call with 'createTransaction'.
CAmount nBalance = getAvailableBalance(&coinControl);
if(total > nBalance)
{
return AmountExceedsBalance;
}
try {
CAmount nFeeRequired = 0;
int nChangePosRet = -1;
auto& newTx = transaction.getWtx();
const auto& res = m_wallet->createTransaction(vecSend, coinControl, /*sign=*/!wallet().privateKeysDisabled(), nChangePosRet, nFeeRequired);
newTx = res ? *res : nullptr;
transaction.setTransactionFee(nFeeRequired);
if (fSubtractFeeFromAmount && newTx)
transaction.reassignAmounts(nChangePosRet);
if(!newTx)
{
if(!fSubtractFeeFromAmount && (total + nFeeRequired) > nBalance)
{
return SendCoinsReturn(AmountWithFeeExceedsBalance);
}
Q_EMIT message(tr("Send Coins"), QString::fromStdString(util::ErrorString(res).translated),
CClientUIInterface::MSG_ERROR);
return TransactionCreationFailed;
}
// Reject absurdly high fee. (This can never happen because the
// wallet never creates transactions with fee greater than
// m_default_max_tx_fee. This merely a belt-and-suspenders check).
if (nFeeRequired > m_wallet->getDefaultMaxTxFee()) {
return AbsurdFee;
}
} catch (const std::runtime_error& err) {
// Something unexpected happened, instruct user to report this bug.
Q_EMIT message(tr("Send Coins"), QString::fromStdString(err.what()),
CClientUIInterface::MSG_ERROR);
return TransactionCreationFailed;
}
return SendCoinsReturn(OK);
}
void WalletModel::sendCoins(WalletModelTransaction& transaction)
{
QByteArray transaction_array; /* store serialized transaction */
{
std::vector<std::pair<std::string, std::string>> vOrderForm;
for (const SendCoinsRecipient &rcp : transaction.getRecipients())
{
if (!rcp.message.isEmpty()) // Message from normal bitcoin:URI (bitcoin:123...?message=example)
vOrderForm.emplace_back("Message", rcp.message.toStdString());
}
auto& newTx = transaction.getWtx();
wallet().commitTransaction(newTx, /*value_map=*/{}, std::move(vOrderForm));
DataStream ssTx;
ssTx << TX_WITH_WITNESS(*newTx);
transaction_array.append((const char*)ssTx.data(), ssTx.size());
}
// Add addresses / update labels that we've sent to the address book,
// and emit coinsSent signal for each recipient
for (const SendCoinsRecipient &rcp : transaction.getRecipients())
{
{
std::string strAddress = rcp.address.toStdString();
CTxDestination dest = DecodeDestination(strAddress);
std::string strLabel = rcp.label.toStdString();
{
// Check if we have a new address or an updated label
std::string name;
if (!m_wallet->getAddress(
dest, &name, /* is_mine= */ nullptr, /* purpose= */ nullptr))
{
m_wallet->setAddressBook(dest, strLabel, wallet::AddressPurpose::SEND);
}
else if (name != strLabel)
{
m_wallet->setAddressBook(dest, strLabel, {}); // {} means don't change purpose
}
}
}
Q_EMIT coinsSent(this, rcp, transaction_array);
}
checkBalanceChanged(m_wallet->getBalances()); // update balance immediately, otherwise there could be a short noticeable delay until pollBalanceChanged hits
}
OptionsModel* WalletModel::getOptionsModel() const
{
return optionsModel;
}
AddressTableModel* WalletModel::getAddressTableModel() const
{
return addressTableModel;
}
TransactionTableModel* WalletModel::getTransactionTableModel() const
{
return transactionTableModel;
}
RecentRequestsTableModel* WalletModel::getRecentRequestsTableModel() const
{
return recentRequestsTableModel;
}
WalletModel::EncryptionStatus WalletModel::getEncryptionStatus() const
{
if(!m_wallet->isCrypted())
{
// A previous bug allowed for watchonly wallets to be encrypted (encryption keys set, but nothing is actually encrypted).
// To avoid misrepresenting the encryption status of such wallets, we only return NoKeys for watchonly wallets that are unencrypted.
if (m_wallet->privateKeysDisabled()) {
return NoKeys;
}
return Unencrypted;
}
else if(m_wallet->isLocked())
{
return Locked;
}
else
{
return Unlocked;
}
}
bool WalletModel::setWalletEncrypted(const SecureString& passphrase)
{
return m_wallet->encryptWallet(passphrase);
}
bool WalletModel::setWalletLocked(bool locked, const SecureString &passPhrase)
{
if(locked)
{
// Lock
return m_wallet->lock();
}
else
{
// Unlock
return m_wallet->unlock(passPhrase);
}
}
bool WalletModel::changePassphrase(const SecureString &oldPass, const SecureString &newPass)
{
m_wallet->lock(); // Make sure wallet is locked before attempting pass change
return m_wallet->changeWalletPassphrase(oldPass, newPass);
}
// Handlers for core signals
static void NotifyUnload(WalletModel* walletModel)
{
qDebug() << "NotifyUnload";
bool invoked = QMetaObject::invokeMethod(walletModel, "unload");
assert(invoked);
}
static void NotifyKeyStoreStatusChanged(WalletModel *walletmodel)
{
qDebug() << "NotifyKeyStoreStatusChanged";
bool invoked = QMetaObject::invokeMethod(walletmodel, "updateStatus", Qt::QueuedConnection);
assert(invoked);
}
static void NotifyAddressBookChanged(WalletModel *walletmodel,
const CTxDestination &address, const std::string &label, bool isMine,
wallet::AddressPurpose purpose, ChangeType status)
{
QString strAddress = QString::fromStdString(EncodeDestination(address));
QString strLabel = QString::fromStdString(label);
qDebug() << "NotifyAddressBookChanged: " + strAddress + " " + strLabel + " isMine=" + QString::number(isMine) + " purpose=" + QString::number(static_cast<uint8_t>(purpose)) + " status=" + QString::number(status);
bool invoked = QMetaObject::invokeMethod(walletmodel, "updateAddressBook",
Q_ARG(QString, strAddress),
Q_ARG(QString, strLabel),
Q_ARG(bool, isMine),
Q_ARG(wallet::AddressPurpose, purpose),
Q_ARG(int, status));
assert(invoked);
}
static void NotifyTransactionChanged(WalletModel *walletmodel, const uint256 &hash, ChangeType status)
{
Q_UNUSED(hash);
Q_UNUSED(status);
bool invoked = QMetaObject::invokeMethod(walletmodel, "updateTransaction", Qt::QueuedConnection);
assert(invoked);
}
static void ShowProgress(WalletModel *walletmodel, const std::string &title, int nProgress)
{
// emits signal "showProgress"
bool invoked = QMetaObject::invokeMethod(walletmodel, "showProgress", Qt::QueuedConnection,
Q_ARG(QString, QString::fromStdString(title)),
Q_ARG(int, nProgress));
assert(invoked);
}
static void NotifyWatchonlyChanged(WalletModel *walletmodel, bool fHaveWatchonly)
{
bool invoked = QMetaObject::invokeMethod(walletmodel, "updateWatchOnlyFlag", Qt::QueuedConnection,
Q_ARG(bool, fHaveWatchonly));
assert(invoked);
}
static void NotifyCanGetAddressesChanged(WalletModel* walletmodel)
{
bool invoked = QMetaObject::invokeMethod(walletmodel, "canGetAddressesChanged");
assert(invoked);
}
void WalletModel::subscribeToCoreSignals()
{
// Connect signals to wallet
m_handler_unload = m_wallet->handleUnload(std::bind(&NotifyUnload, this));
m_handler_status_changed = m_wallet->handleStatusChanged(std::bind(&NotifyKeyStoreStatusChanged, this));
m_handler_address_book_changed = m_wallet->handleAddressBookChanged(std::bind(NotifyAddressBookChanged, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5));
m_handler_transaction_changed = m_wallet->handleTransactionChanged(std::bind(NotifyTransactionChanged, this, std::placeholders::_1, std::placeholders::_2));
m_handler_show_progress = m_wallet->handleShowProgress(std::bind(ShowProgress, this, std::placeholders::_1, std::placeholders::_2));
m_handler_watch_only_changed = m_wallet->handleWatchOnlyChanged(std::bind(NotifyWatchonlyChanged, this, std::placeholders::_1));
m_handler_can_get_addrs_changed = m_wallet->handleCanGetAddressesChanged(std::bind(NotifyCanGetAddressesChanged, this));
}
void WalletModel::unsubscribeFromCoreSignals()
{
// Disconnect signals from wallet
m_handler_unload->disconnect();
m_handler_status_changed->disconnect();
m_handler_address_book_changed->disconnect();
m_handler_transaction_changed->disconnect();
m_handler_show_progress->disconnect();
m_handler_watch_only_changed->disconnect();
m_handler_can_get_addrs_changed->disconnect();
}
// WalletModel::UnlockContext implementation
WalletModel::UnlockContext WalletModel::requestUnlock()
{
// Bugs in earlier versions may have resulted in wallets with private keys disabled to become "encrypted"
// (encryption keys are present, but not actually doing anything).
// To avoid issues with such wallets, check if the wallet has private keys disabled, and if so, return a context
// that indicates the wallet is not encrypted.
if (m_wallet->privateKeysDisabled()) {
return UnlockContext(this, /*valid=*/true, /*relock=*/false);
}
bool was_locked = getEncryptionStatus() == Locked;
if(was_locked)
{
// Request UI to unlock wallet
Q_EMIT requireUnlock();
}
// If wallet is still locked, unlock was failed or cancelled, mark context as invalid
bool valid = getEncryptionStatus() != Locked;
return UnlockContext(this, valid, was_locked);
}
WalletModel::UnlockContext::UnlockContext(WalletModel *_wallet, bool _valid, bool _relock):
wallet(_wallet),
valid(_valid),
relock(_relock)
{
}
WalletModel::UnlockContext::~UnlockContext()
{
if(valid && relock)
{
wallet->setWalletLocked(true);
}
}
bool WalletModel::bumpFee(uint256 hash, uint256& new_hash)
{
CCoinControl coin_control;
coin_control.m_signal_bip125_rbf = true;
std::vector<bilingual_str> errors;
CAmount old_fee;
CAmount new_fee;
CMutableTransaction mtx;
if (!m_wallet->createBumpTransaction(hash, coin_control, errors, old_fee, new_fee, mtx)) {
QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Increasing transaction fee failed") + "<br />(" +
(errors.size() ? QString::fromStdString(errors[0].translated) : "") +")");
return false;
}
// allow a user based fee verification
/*: Asks a user if they would like to manually increase the fee of a transaction that has already been created. */
QString questionString = tr("Do you want to increase the fee?");
questionString.append("<br />");
questionString.append("<table style=\"text-align: left;\">");
questionString.append("<tr><td>");
questionString.append(tr("Current fee:"));
questionString.append("</td><td>");
questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), old_fee));
questionString.append("</td></tr><tr><td>");
questionString.append(tr("Increase:"));
questionString.append("</td><td>");
questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), new_fee - old_fee));
questionString.append("</td></tr><tr><td>");
questionString.append(tr("New fee:"));
questionString.append("</td><td>");
questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), new_fee));
questionString.append("</td></tr></table>");
// Display warning in the "Confirm fee bump" window if the "Coin Control Features" option is enabled
if (getOptionsModel()->getCoinControlFeatures()) {
questionString.append("<br><br>");
questionString.append(tr("Warning: This may pay the additional fee by reducing change outputs or adding inputs, when necessary. It may add a new change output if one does not already exist. These changes may potentially leak privacy."));
}
const bool enable_send{!wallet().privateKeysDisabled() || wallet().hasExternalSigner()};
const bool always_show_unsigned{getOptionsModel()->getEnablePSBTControls()};
auto confirmationDialog = new SendConfirmationDialog(tr("Confirm fee bump"), questionString, "", "", SEND_CONFIRM_DELAY, enable_send, always_show_unsigned, nullptr);
confirmationDialog->setAttribute(Qt::WA_DeleteOnClose);
// TODO: Replace QDialog::exec() with safer QDialog::show().
const auto retval = static_cast<QMessageBox::StandardButton>(confirmationDialog->exec());
// cancel sign&broadcast if user doesn't want to bump the fee
if (retval != QMessageBox::Yes && retval != QMessageBox::Save) {
return false;
}
// Short-circuit if we are returning a bumped transaction PSBT to clipboard
if (retval == QMessageBox::Save) {
// "Create Unsigned" clicked
PartiallySignedTransaction psbtx(mtx);
bool complete = false;
const TransactionError err = wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, nullptr, psbtx, complete);
if (err != TransactionError::OK || complete) {
QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Can't draft transaction."));
return false;
}
// Serialize the PSBT
DataStream ssTx{};
ssTx << psbtx;
GUIUtil::setClipboard(EncodeBase64(ssTx.str()).c_str());
Q_EMIT message(tr("PSBT copied"), tr("Fee-bump PSBT copied to clipboard"), CClientUIInterface::MSG_INFORMATION | CClientUIInterface::MODAL);
return true;
}
WalletModel::UnlockContext ctx(requestUnlock());
if (!ctx.isValid()) {
return false;
}
assert(!m_wallet->privateKeysDisabled() || wallet().hasExternalSigner());
// sign bumped transaction
if (!m_wallet->signBumpTransaction(mtx)) {
QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Can't sign transaction."));
return false;
}
// commit the bumped transaction
if(!m_wallet->commitBumpTransaction(hash, std::move(mtx), errors, new_hash)) {
QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Could not commit transaction") + "<br />(" +
QString::fromStdString(errors[0].translated)+")");
return false;
}
return true;
}
void WalletModel::displayAddress(std::string sAddress) const
{
CTxDestination dest = DecodeDestination(sAddress);
try {
util::Result<void> result = m_wallet->displayAddress(dest);
if (!result) {
QMessageBox::warning(nullptr, tr("Signer error"), QString::fromStdString(util::ErrorString(result).translated));
}
} catch (const std::runtime_error& e) {
QMessageBox::critical(nullptr, tr("Can't display address"), e.what());
}
}
bool WalletModel::isWalletEnabled()
{
return !gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET);
}
QString WalletModel::getWalletName() const
{
return QString::fromStdString(m_wallet->getWalletName());
}
QString WalletModel::getDisplayName() const
{
const QString name = getWalletName();
return name.isEmpty() ? "["+tr("default wallet")+"]" : name;
}
bool WalletModel::isMultiwallet() const
{
return m_node.walletLoader().getWallets().size() > 1;
}
void WalletModel::refresh(bool pk_hash_only)
{
addressTableModel = new AddressTableModel(this, pk_hash_only);
}
uint256 WalletModel::getLastBlockProcessed() const
{
return m_client_model ? m_client_model->getBestBlockHash() : uint256{};
}
CAmount WalletModel::getAvailableBalance(const CCoinControl* control)
{
// No selected coins, return the cached balance
if (!control || !control->HasSelected()) {
const interfaces::WalletBalances& balances = getCachedBalance();
CAmount available_balance = balances.balance;
// if wallet private keys are disabled, this is a watch-only wallet
// so, let's include the watch-only balance.
if (balances.have_watch_only && m_wallet->privateKeysDisabled()) {
available_balance += balances.watch_only_balance;
}
return available_balance;
}
// Fetch balance from the wallet, taking into account the selected coins
return wallet().getAvailableBalance(*control);
}
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