1 files changed, 695 insertions, 0 deletions

diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
new file mode 100644
index 000000000..c8a2cb37e
--- /dev/null
+++ b/src/qt/walletmodel.cpp
@@ -0,0 +1,695 @@
+// Copyright (c) 2011-2015 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 "walletmodel.h"
+
+#include "addresstablemodel.h"
+#include "guiconstants.h"
+#include "guiutil.h"
+#include "paymentserver.h"
+#include "recentrequeststablemodel.h"
+#include "transactiontablemodel.h"
+
+#include "base58.h"
+#include "keystore.h"
+#include "main.h"
+#include "sync.h"
+#include "ui_interface.h"
+#include "wallet/wallet.h"
+#include "wallet/walletdb.h" // for BackupWallet
+
+#include <stdint.h>
+
+#include <QDebug>
+#include <QSet>
+#include <QTimer>
+
+#include <boost/foreach.hpp>
+
+WalletModel::WalletModel(const PlatformStyle *platformStyle, CWallet *_wallet, OptionsModel *_optionsModel, QObject *parent) :
+    QObject(parent), wallet(_wallet), optionsModel(_optionsModel), addressTableModel(0),
+    transactionTableModel(0),
+    recentRequestsTableModel(0),
+    cachedBalance(0), cachedUnconfirmedBalance(0), cachedImmatureBalance(0),
+    cachedEncryptionStatus(Unencrypted),
+    cachedNumBlocks(0)
+{
+    fHaveWatchOnly = wallet->HaveWatchOnly();
+    fForceCheckBalanceChanged = false;
+
+    addressTableModel = new AddressTableModel(wallet, this);
+    transactionTableModel = new TransactionTableModel(platformStyle, wallet, this);
+    recentRequestsTableModel = new RecentRequestsTableModel(wallet, this);
+
+    // This timer will be fired repeatedly to update the balance
+    pollTimer = new QTimer(this);
+    connect(pollTimer, SIGNAL(timeout()), this, SLOT(pollBalanceChanged()));
+    pollTimer->start(MODEL_UPDATE_DELAY);
+
+    subscribeToCoreSignals();
+}
+
+WalletModel::~WalletModel()
+{
+    unsubscribeFromCoreSignals();
+}
+
+CAmount WalletModel::getBalance(const CCoinControl *coinControl) const
+{
+    if (coinControl)
+    {
+        CAmount nBalance = 0;
+        std::vector<COutput> vCoins;
+        wallet->AvailableCoins(vCoins, true, coinControl);
+        BOOST_FOREACH(const COutput& out, vCoins)
+            if(out.fSpendable)
+                nBalance += out.tx->vout[out.i].nValue;
+
+        return nBalance;
+    }
+
+    return wallet->GetBalance();
+}
+
+CAmount WalletModel::getUnconfirmedBalance() const
+{
+    return wallet->GetUnconfirmedBalance();
+}
+
+CAmount WalletModel::getImmatureBalance() const
+{
+    return wallet->GetImmatureBalance();
+}
+
+bool WalletModel::haveWatchOnly() const
+{
+    return fHaveWatchOnly;
+}
+
+CAmount WalletModel::getWatchBalance() const
+{
+    return wallet->GetWatchOnlyBalance();
+}
+
+CAmount WalletModel::getWatchUnconfirmedBalance() const
+{
+    return wallet->GetUnconfirmedWatchOnlyBalance();
+}
+
+CAmount WalletModel::getWatchImmatureBalance() const
+{
+    return wallet->GetImmatureWatchOnlyBalance();
+}
+
+void WalletModel::updateStatus()
+{
+    EncryptionStatus newEncryptionStatus = getEncryptionStatus();
+
+    if(cachedEncryptionStatus != newEncryptionStatus)
+        Q_EMIT encryptionStatusChanged(newEncryptionStatus);
+}
+
+void WalletModel::pollBalanceChanged()
+{
+    // Get required locks upfront. 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.
+    TRY_LOCK(cs_main, lockMain);
+    if(!lockMain)
+        return;
+    TRY_LOCK(wallet->cs_wallet, lockWallet);
+    if(!lockWallet)
+        return;
+
+    if(fForceCheckBalanceChanged || chainActive.Height() != cachedNumBlocks)
+    {
+        fForceCheckBalanceChanged = false;
+
+        // Balance and number of transactions might have changed
+        cachedNumBlocks = chainActive.Height();
+
+        checkBalanceChanged();
+        if(transactionTableModel)
+            transactionTableModel->updateConfirmations();
+    }
+}
+
+void WalletModel::checkBalanceChanged()
+{
+    CAmount newBalance = getBalance();
+    CAmount newUnconfirmedBalance = getUnconfirmedBalance();
+    CAmount newImmatureBalance = getImmatureBalance();
+    CAmount newWatchOnlyBalance = 0;
+    CAmount newWatchUnconfBalance = 0;
+    CAmount newWatchImmatureBalance = 0;
+    if (haveWatchOnly())
+    {
+        newWatchOnlyBalance = getWatchBalance();
+        newWatchUnconfBalance = getWatchUnconfirmedBalance();
+        newWatchImmatureBalance = getWatchImmatureBalance();
+    }
+
+    if(cachedBalance != newBalance || cachedUnconfirmedBalance != newUnconfirmedBalance || cachedImmatureBalance != newImmatureBalance ||
+        cachedWatchOnlyBalance != newWatchOnlyBalance || cachedWatchUnconfBalance != newWatchUnconfBalance || cachedWatchImmatureBalance != newWatchImmatureBalance)
+    {
+        cachedBalance = newBalance;
+        cachedUnconfirmedBalance = newUnconfirmedBalance;
+        cachedImmatureBalance = newImmatureBalance;
+        cachedWatchOnlyBalance = newWatchOnlyBalance;
+        cachedWatchUnconfBalance = newWatchUnconfBalance;
+        cachedWatchImmatureBalance = newWatchImmatureBalance;
+        Q_EMIT balanceChanged(newBalance, newUnconfirmedBalance, newImmatureBalance,
+                            newWatchOnlyBalance, newWatchUnconfBalance, newWatchImmatureBalance);
+    }
+}
+
+void WalletModel::updateTransaction()
+{
+    // Balance and number of transactions might have changed
+    fForceCheckBalanceChanged = true;
+}
+
+void WalletModel::updateAddressBook(const QString &address, const QString &label,
+        bool isMine, const QString &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)
+{
+    CBitcoinAddress addressParsed(address.toStdString());
+    return addressParsed.IsValid();
+}
+
+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
+    Q_FOREACH(const SendCoinsRecipient &rcp, recipients)
+    {
+        if (rcp.fSubtractFeeFromAmount)
+            fSubtractFeeFromAmount = true;
+
+        if (rcp.paymentRequest.IsInitialized())
+        {   // PaymentRequest...
+            CAmount subtotal = 0;
+            const payments::PaymentDetails& details = rcp.paymentRequest.getDetails();
+            for (int i = 0; i < details.outputs_size(); i++)
+            {
+                const payments::Output& out = details.outputs(i);
+                if (out.amount() <= 0) continue;
+                subtotal += out.amount();
+                const unsigned char* scriptStr = (const unsigned char*)out.script().data();
+                CScript scriptPubKey(scriptStr, scriptStr+out.script().size());
+                CAmount nAmount = out.amount();
+                CRecipient recipient = {scriptPubKey, nAmount, rcp.fSubtractFeeFromAmount};
+                vecSend.push_back(recipient);
+            }
+            if (subtotal <= 0)
+            {
+                return InvalidAmount;
+            }
+            total += subtotal;
+        }
+        else
+        {   // User-entered bitcoin address / amount:
+            if(!validateAddress(rcp.address))
+            {
+                return InvalidAddress;
+            }
+            if(rcp.amount <= 0)
+            {
+                return InvalidAmount;
+            }
+            setAddress.insert(rcp.address);
+            ++nAddresses;
+
+            CScript scriptPubKey = GetScriptForDestination(CBitcoinAddress(rcp.address.toStdString()).Get());
+            CRecipient recipient = {scriptPubKey, rcp.amount, rcp.fSubtractFeeFromAmount};
+            vecSend.push_back(recipient);
+
+            total += rcp.amount;
+        }
+    }
+    if(setAddress.size() != nAddresses)
+    {
+        return DuplicateAddress;
+    }
+
+    CAmount nBalance = getBalance(coinControl);
+
+    if(total > nBalance)
+    {
+        return AmountExceedsBalance;
+    }
+
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+
+        transaction.newPossibleKeyChange(wallet);
+
+        CAmount nFeeRequired = 0;
+        int nChangePosRet = -1;
+        std::string strFailReason;
+
+        CWalletTx *newTx = transaction.getTransaction();
+        CReserveKey *keyChange = transaction.getPossibleKeyChange();
+        bool fCreated = wallet->CreateTransaction(vecSend, *newTx, *keyChange, nFeeRequired, nChangePosRet, strFailReason, coinControl);
+        transaction.setTransactionFee(nFeeRequired);
+        if (fSubtractFeeFromAmount && fCreated)
+            transaction.reassignAmounts(nChangePosRet);
+
+        if(!fCreated)
+        {
+            if(!fSubtractFeeFromAmount && (total + nFeeRequired) > nBalance)
+            {
+                return SendCoinsReturn(AmountWithFeeExceedsBalance);
+            }
+            Q_EMIT message(tr("Send Coins"), QString::fromStdString(strFailReason),
+                         CClientUIInterface::MSG_ERROR);
+            return TransactionCreationFailed;
+        }
+
+        // reject absurdly high fee. (This can never happen because the
+        // wallet caps the fee at maxTxFee. This merely serves as a
+        // belt-and-suspenders check)
+        if (nFeeRequired > maxTxFee)
+            return AbsurdFee;
+    }
+
+    return SendCoinsReturn(OK);
+}
+
+WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &transaction)
+{
+    QByteArray transaction_array; /* store serialized transaction */
+
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+        CWalletTx *newTx = transaction.getTransaction();
+
+        Q_FOREACH(const SendCoinsRecipient &rcp, transaction.getRecipients())
+        {
+            if (rcp.paymentRequest.IsInitialized())
+            {
+                // Make sure any payment requests involved are still valid.
+                if (PaymentServer::verifyExpired(rcp.paymentRequest.getDetails())) {
+                    return PaymentRequestExpired;
+                }
+
+                // Store PaymentRequests in wtx.vOrderForm in wallet.
+                std::string key("PaymentRequest");
+                std::string value;
+                rcp.paymentRequest.SerializeToString(&value);
+                newTx->vOrderForm.push_back(make_pair(key, value));
+            }
+            else if (!rcp.message.isEmpty()) // Message from normal bitcoin:URI (bitcoin:123...?message=example)
+                newTx->vOrderForm.push_back(make_pair("Message", rcp.message.toStdString()));
+        }
+
+        CReserveKey *keyChange = transaction.getPossibleKeyChange();
+        if(!wallet->CommitTransaction(*newTx, *keyChange, g_connman.get()))
+            return TransactionCommitFailed;
+
+        CTransaction* t = (CTransaction*)newTx;
+        CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+        ssTx << *t;
+        transaction_array.append(&(ssTx[0]), ssTx.size());
+    }
+
+    // Add addresses / update labels that we've sent to to the address book,
+    // and emit coinsSent signal for each recipient
+    Q_FOREACH(const SendCoinsRecipient &rcp, transaction.getRecipients())
+    {
+        // Don't touch the address book when we have a payment request
+        if (!rcp.paymentRequest.IsInitialized())
+        {
+            std::string strAddress = rcp.address.toStdString();
+            CTxDestination dest = CBitcoinAddress(strAddress).Get();
+            std::string strLabel = rcp.label.toStdString();
+            {
+                LOCK(wallet->cs_wallet);
+
+                std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(dest);
+
+                // Check if we have a new address or an updated label
+                if (mi == wallet->mapAddressBook.end())
+                {
+                    wallet->SetAddressBook(dest, strLabel, "send");
+                }
+                else if (mi->second.name != strLabel)
+                {
+                    wallet->SetAddressBook(dest, strLabel, ""); // "" means don't change purpose
+                }
+            }
+        }
+        Q_EMIT coinsSent(wallet, rcp, transaction_array);
+    }
+    checkBalanceChanged(); // update balance immediately, otherwise there could be a short noticeable delay until pollBalanceChanged hits
+
+    return SendCoinsReturn(OK);
+}
+
+OptionsModel *WalletModel::getOptionsModel()
+{
+    return optionsModel;
+}
+
+AddressTableModel *WalletModel::getAddressTableModel()
+{
+    return addressTableModel;
+}
+
+TransactionTableModel *WalletModel::getTransactionTableModel()
+{
+    return transactionTableModel;
+}
+
+RecentRequestsTableModel *WalletModel::getRecentRequestsTableModel()
+{
+    return recentRequestsTableModel;
+}
+
+WalletModel::EncryptionStatus WalletModel::getEncryptionStatus() const
+{
+    if(!wallet->IsCrypted())
+    {
+        return Unencrypted;
+    }
+    else if(wallet->IsLocked())
+    {
+        return Locked;
+    }
+    else
+    {
+        return Unlocked;
+    }
+}
+
+bool WalletModel::setWalletEncrypted(bool encrypted, const SecureString &passphrase)
+{
+    if(encrypted)
+    {
+        // Encrypt
+        return wallet->EncryptWallet(passphrase);
+    }
+    else
+    {
+        // Decrypt -- TODO; not supported yet
+        return false;
+    }
+}
+
+bool WalletModel::setWalletLocked(bool locked, const SecureString &passPhrase)
+{
+    if(locked)
+    {
+        // Lock
+        return wallet->Lock();
+    }
+    else
+    {
+        // Unlock
+        return wallet->Unlock(passPhrase);
+    }
+}
+
+bool WalletModel::changePassphrase(const SecureString &oldPass, const SecureString &newPass)
+{
+    bool retval;
+    {
+        LOCK(wallet->cs_wallet);
+        wallet->Lock(); // Make sure wallet is locked before attempting pass change
+        retval = wallet->ChangeWalletPassphrase(oldPass, newPass);
+    }
+    return retval;
+}
+
+bool WalletModel::backupWallet(const QString &filename)
+{
+    return wallet->BackupWallet(filename.toLocal8Bit().data());
+}
+
+// Handlers for core signals
+static void NotifyKeyStoreStatusChanged(WalletModel *walletmodel, CCryptoKeyStore *wallet)
+{
+    qDebug() << "NotifyKeyStoreStatusChanged";
+    QMetaObject::invokeMethod(walletmodel, "updateStatus", Qt::QueuedConnection);
+}
+
+static void NotifyAddressBookChanged(WalletModel *walletmodel, CWallet *wallet,
+        const CTxDestination &address, const std::string &label, bool isMine,
+        const std::string &purpose, ChangeType status)
+{
+    QString strAddress = QString::fromStdString(CBitcoinAddress(address).ToString());
+    QString strLabel = QString::fromStdString(label);
+    QString strPurpose = QString::fromStdString(purpose);
+
+    qDebug() << "NotifyAddressBookChanged: " + strAddress + " " + strLabel + " isMine=" + QString::number(isMine) + " purpose=" + strPurpose + " status=" + QString::number(status);
+    QMetaObject::invokeMethod(walletmodel, "updateAddressBook", Qt::QueuedConnection,
+                              Q_ARG(QString, strAddress),
+                              Q_ARG(QString, strLabel),
+                              Q_ARG(bool, isMine),
+                              Q_ARG(QString, strPurpose),
+                              Q_ARG(int, status));
+}
+
+static void NotifyTransactionChanged(WalletModel *walletmodel, CWallet *wallet, const uint256 &hash, ChangeType status)
+{
+    Q_UNUSED(wallet);
+    Q_UNUSED(hash);
+    Q_UNUSED(status);
+    QMetaObject::invokeMethod(walletmodel, "updateTransaction", Qt::QueuedConnection);
+}
+
+static void ShowProgress(WalletModel *walletmodel, const std::string &title, int nProgress)
+{
+    // emits signal "showProgress"
+    QMetaObject::invokeMethod(walletmodel, "showProgress", Qt::QueuedConnection,
+                              Q_ARG(QString, QString::fromStdString(title)),
+                              Q_ARG(int, nProgress));
+}
+
+static void NotifyWatchonlyChanged(WalletModel *walletmodel, bool fHaveWatchonly)
+{
+    QMetaObject::invokeMethod(walletmodel, "updateWatchOnlyFlag", Qt::QueuedConnection,
+                              Q_ARG(bool, fHaveWatchonly));
+}
+
+void WalletModel::subscribeToCoreSignals()
+{
+    // Connect signals to wallet
+    wallet->NotifyStatusChanged.connect(boost::bind(&NotifyKeyStoreStatusChanged, this, _1));
+    wallet->NotifyAddressBookChanged.connect(boost::bind(NotifyAddressBookChanged, this, _1, _2, _3, _4, _5, _6));
+    wallet->NotifyTransactionChanged.connect(boost::bind(NotifyTransactionChanged, this, _1, _2, _3));
+    wallet->ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2));
+    wallet->NotifyWatchonlyChanged.connect(boost::bind(NotifyWatchonlyChanged, this, _1));
+}
+
+void WalletModel::unsubscribeFromCoreSignals()
+{
+    // Disconnect signals from wallet
+    wallet->NotifyStatusChanged.disconnect(boost::bind(&NotifyKeyStoreStatusChanged, this, _1));
+    wallet->NotifyAddressBookChanged.disconnect(boost::bind(NotifyAddressBookChanged, this, _1, _2, _3, _4, _5, _6));
+    wallet->NotifyTransactionChanged.disconnect(boost::bind(NotifyTransactionChanged, this, _1, _2, _3));
+    wallet->ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2));
+    wallet->NotifyWatchonlyChanged.disconnect(boost::bind(NotifyWatchonlyChanged, this, _1));
+}
+
+// WalletModel::UnlockContext implementation
+WalletModel::UnlockContext WalletModel::requestUnlock()
+{
+    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);
+    }
+}
+
+void WalletModel::UnlockContext::CopyFrom(const UnlockContext& rhs)
+{
+    // Transfer context; old object no longer relocks wallet
+    *this = rhs;
+    rhs.relock = false;
+}
+
+bool WalletModel::getPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const
+{
+    return wallet->GetPubKey(address, vchPubKeyOut);
+}
+
+bool WalletModel::havePrivKey(const CKeyID &address) const
+{
+    return wallet->HaveKey(address);
+}
+
+// returns a list of COutputs from COutPoints
+void WalletModel::getOutputs(const std::vector<COutPoint>& vOutpoints, std::vector<COutput>& vOutputs)
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    BOOST_FOREACH(const COutPoint& outpoint, vOutpoints)
+    {
+        if (!wallet->mapWallet.count(outpoint.hash)) continue;
+        int nDepth = wallet->mapWallet[outpoint.hash].GetDepthInMainChain();
+        if (nDepth < 0) continue;
+        COutput out(&wallet->mapWallet[outpoint.hash], outpoint.n, nDepth, true, true);
+        vOutputs.push_back(out);
+    }
+}
+
+bool WalletModel::isSpent(const COutPoint& outpoint) const
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    return wallet->IsSpent(outpoint.hash, outpoint.n);
+}
+
+// AvailableCoins + LockedCoins grouped by wallet address (put change in one group with wallet address)
+void WalletModel::listCoins(std::map<QString, std::vector<COutput> >& mapCoins) const
+{
+    std::vector<COutput> vCoins;
+    wallet->AvailableCoins(vCoins);
+
+    LOCK2(cs_main, wallet->cs_wallet); // ListLockedCoins, mapWallet
+    std::vector<COutPoint> vLockedCoins;
+    wallet->ListLockedCoins(vLockedCoins);
+
+    // add locked coins
+    BOOST_FOREACH(const COutPoint& outpoint, vLockedCoins)
+    {
+        if (!wallet->mapWallet.count(outpoint.hash)) continue;
+        int nDepth = wallet->mapWallet[outpoint.hash].GetDepthInMainChain();
+        if (nDepth < 0) continue;
+        COutput out(&wallet->mapWallet[outpoint.hash], outpoint.n, nDepth, true, true);
+        if (outpoint.n < out.tx->vout.size() && wallet->IsMine(out.tx->vout[outpoint.n]) == ISMINE_SPENDABLE)
+            vCoins.push_back(out);
+    }
+
+    BOOST_FOREACH(const COutput& out, vCoins)
+    {
+        COutput cout = out;
+
+        while (wallet->IsChange(cout.tx->vout[cout.i]) && cout.tx->vin.size() > 0 && wallet->IsMine(cout.tx->vin[0]))
+        {
+            if (!wallet->mapWallet.count(cout.tx->vin[0].prevout.hash)) break;
+            cout = COutput(&wallet->mapWallet[cout.tx->vin[0].prevout.hash], cout.tx->vin[0].prevout.n, 0, true, true);
+        }
+
+        CTxDestination address;
+        if(!out.fSpendable || !ExtractDestination(cout.tx->vout[cout.i].scriptPubKey, address))
+            continue;
+        mapCoins[QString::fromStdString(CBitcoinAddress(address).ToString())].push_back(out);
+    }
+}
+
+bool WalletModel::isLockedCoin(uint256 hash, unsigned int n) const
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    return wallet->IsLockedCoin(hash, n);
+}
+
+void WalletModel::lockCoin(COutPoint& output)
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    wallet->LockCoin(output);
+}
+
+void WalletModel::unlockCoin(COutPoint& output)
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    wallet->UnlockCoin(output);
+}
+
+void WalletModel::listLockedCoins(std::vector<COutPoint>& vOutpts)
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    wallet->ListLockedCoins(vOutpts);
+}
+
+void WalletModel::loadReceiveRequests(std::vector<std::string>& vReceiveRequests)
+{
+    LOCK(wallet->cs_wallet);
+    BOOST_FOREACH(const PAIRTYPE(CTxDestination, CAddressBookData)& item, wallet->mapAddressBook)
+        BOOST_FOREACH(const PAIRTYPE(std::string, std::string)& item2, item.second.destdata)
+            if (item2.first.size() > 2 && item2.first.substr(0,2) == "rr") // receive request
+                vReceiveRequests.push_back(item2.second);
+}
+
+bool WalletModel::saveReceiveRequest(const std::string &sAddress, const int64_t nId, const std::string &sRequest)
+{
+    CTxDestination dest = CBitcoinAddress(sAddress).Get();
+
+    std::stringstream ss;
+    ss << nId;
+    std::string key = "rr" + ss.str(); // "rr" prefix = "receive request" in destdata
+
+    LOCK(wallet->cs_wallet);
+    if (sRequest.empty())
+        return wallet->EraseDestData(dest, key);
+    else
+        return wallet->AddDestData(dest, key, sRequest);
+}
+
+bool WalletModel::transactionCanBeAbandoned(uint256 hash) const
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    const CWalletTx *wtx = wallet->GetWalletTx(hash);
+    if (!wtx || wtx->isAbandoned() || wtx->GetDepthInMainChain() > 0 || wtx->InMempool())
+        return false;
+    return true;
+}
+
+bool WalletModel::abandonTransaction(uint256 hash) const
+{
+    LOCK2(cs_main, wallet->cs_wallet);
+    return wallet->AbandonTransaction(hash);
+}
+
+bool WalletModel::isWalletEnabled()
+{
+   return !GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET);
+}
+
+bool WalletModel::hdEnabled() const
+{
+    return wallet->IsHDEnabled();
+}