bool isDust(const QString& address, qint64 amount)
{
CTxDestination dest = CPatacoinAddress(address.toStdString()).Get();
CScript script; script.SetDestination(dest);
CTxOut txOut(amount, script);
return txOut.IsDust(CTransaction::nMinRelayTxFee);
}
bool isDust(interfaces::Node& node, const QString& address, const CAmount& amount)
{
CTxDestination dest = DecodeDestination(address.toStdString());
CScript script = GetScriptForDestination(dest);
CTxOut txOut(amount, script);
return IsDust(txOut, node.getDustRelayFee());
}
bool isDust(const QString& address, const CAmount& amount)
{
CTxDestination dest = CBitcoinAddress(address.toStdString()).Get();
CScript script = GetScriptForDestination(dest);
CTxOut txOut(amount, script);
return txOut.IsDust(::minRelayTxFee);
}
bool isDust(const QString& address, const CAmount& amount)
{
CTxDestination dest = DecodeDestination(address.toStdString());
CScript script = GetScriptForDestination(dest);
CTxOut txOut(amount, script);
return IsDust(txOut, ::dustRelayFee);
}
bool PaymentServer::processPaymentRequest(const PaymentRequestPlus& request, SendCoinsRecipient& recipient)
{
if (!optionsModel)
return false;
if (request.IsInitialized()) {
// Payment request network matches client network?
if (!verifyNetwork(request.getDetails())) {
Q_EMIT message(tr("Payment request rejected"), tr("Payment request network doesn't match client network."),
CClientUIInterface::MSG_ERROR);
return false;
}
// Make sure any payment requests involved are still valid.
// This is re-checked just before sending coins in WalletModel::sendCoins().
if (verifyExpired(request.getDetails())) {
Q_EMIT message(tr("Payment request rejected"), tr("Payment request expired."),
CClientUIInterface::MSG_ERROR);
return false;
}
} else {
Q_EMIT message(tr("Payment request error"), tr("Payment request is not initialized."),
CClientUIInterface::MSG_ERROR);
return false;
}
recipient.paymentRequest = request;
recipient.message = GUIUtil::HtmlEscape(request.getDetails().memo());
request.getMerchant(certStore.get(), recipient.authenticatedMerchant);
QList<std::pair<CScript, CAmount> > sendingTos = request.getPayTo();
QStringList addresses;
for (const std::pair<CScript, CAmount>& sendingTo : sendingTos) {
// Extract and check destination addresses
CTxDestination dest;
if (ExtractDestination(sendingTo.first, dest)) {
// Append destination address
addresses.append(QString::fromStdString(EncodeDestination(dest)));
}
else if (!recipient.authenticatedMerchant.isEmpty()) {
// Unauthenticated payment requests to custom bitcoin addresses are not supported
// (there is no good way to tell the user where they are paying in a way they'd
// have a chance of understanding).
Q_EMIT message(tr("Payment request rejected"),
tr("Unverified payment requests to custom payment scripts are unsupported."),
CClientUIInterface::MSG_ERROR);
return false;
}
// Bitcoin amounts are stored as (optional) uint64 in the protobuf messages (see paymentrequest.proto),
// but CAmount is defined as int64_t. Because of that we need to verify that amounts are in a valid range
// and no overflow has happened.
if (!verifyAmount(sendingTo.second)) {
Q_EMIT message(tr("Payment request rejected"), tr("Invalid payment request."), CClientUIInterface::MSG_ERROR);
return false;
}
// Extract and check amounts
CTxOut txOut(sendingTo.second, sendingTo.first);
if (IsDust(txOut, ::dustRelayFee)) {
Q_EMIT message(tr("Payment request error"), tr("Requested payment amount of %1 is too small (considered dust).")
.arg(BitcoinUnits::formatWithUnit(optionsModel->getDisplayUnit(), sendingTo.second)),
CClientUIInterface::MSG_ERROR);
return false;
}
recipient.amount += sendingTo.second;
// Also verify that the final amount is still in a valid range after adding additional amounts.
if (!verifyAmount(recipient.amount)) {
Q_EMIT message(tr("Payment request rejected"), tr("Invalid payment request."), CClientUIInterface::MSG_ERROR);
return false;
}
}
// Store addresses and format them to fit nicely into the GUI
recipient.address = addresses.join("<br />");
if (!recipient.authenticatedMerchant.isEmpty()) {
qDebug() << "PaymentServer::processPaymentRequest: Secure payment request from " << recipient.authenticatedMerchant;
}
else {
qDebug() << "PaymentServer::processPaymentRequest: Insecure payment request to " << addresses.join(", ");
}
return true;
}
