Introduce wrappers around CBitcoinAddress

This patch removes the need for the intermediary Base58 type
CBitcoinAddress, by providing {Encode,Decode,IsValid}Destination
function that directly operate on the conversion between strings
and CTxDestination.

Author: sipa

src/base58.cpp

@@ -318,3 +318,25 @@ bool CBitcoinSecret::SetString(const std::string& strSecret)
 {
     return SetString(strSecret.c_str());
 }
+
+std::string EncodeDestination(const CTxDestination& dest)
+{
+    CBitcoinAddress addr(dest);
+    if (!addr.IsValid()) return "";
+    return addr.ToString();
+}
+
+CTxDestination DecodeDestination(const std::string& str)
+{
+    return CBitcoinAddress(str).Get();
+}
+
+bool IsValidDestinationString(const std::string& str, const CChainParams& params)
+{
+    return CBitcoinAddress(str).IsValid(params);
+}
+
+bool IsValidDestinationString(const std::string& str)
+{
+    return CBitcoinAddress(str).IsValid();
+}

src/base58.h

@@ -167,4 +167,9 @@ template<typename K, int Size, CChainParams::Base58Type Type> class CBitcoinExtK
 typedef CBitcoinExtKeyBase<CExtKey, BIP32_EXTKEY_SIZE, CChainParams::EXT_SECRET_KEY> CBitcoinExtKey;
 typedef CBitcoinExtKeyBase<CExtPubKey, BIP32_EXTKEY_SIZE, CChainParams::EXT_PUBLIC_KEY> CBitcoinExtPubKey;
 
+std::string EncodeDestination(const CTxDestination& dest);
+CTxDestination DecodeDestination(const std::string& str);
+bool IsValidDestinationString(const std::string& str);
+bool IsValidDestinationString(const std::string& str, const CChainParams& params);
+
 #endif // BITCOIN_BASE58_H

src/bitcoin-tx.cpp

@@ -271,11 +271,11 @@ static void MutateTxAddOutAddr(CMutableTransaction& tx, const std::string& strIn
 
     // extract and validate ADDRESS
     std::string strAddr = vStrInputParts[1];
-    CBitcoinAddress addr(strAddr);
-    if (!addr.IsValid())
+    CTxDestination destination = DecodeDestination(strAddr);
+    if (!IsValidDestination(destination)) {
         throw std::runtime_error("invalid TX output address");
-    // build standard output script via GetScriptForDestination()
-    CScript scriptPubKey = GetScriptForDestination(addr.Get());
+    }
+    CScript scriptPubKey = GetScriptForDestination(destination);
 
     // construct TxOut, append to transaction output list
     CTxOut txout(value, scriptPubKey);
@@ -314,10 +314,8 @@ static void MutateTxAddOutPubKey(CMutableTransaction& tx, const std::string& str
         scriptPubKey = GetScriptForWitness(scriptPubKey);
     }
     if (bScriptHash) {
-        // Get the address for the redeem script, then call
-        // GetScriptForDestination() to construct a P2SH scriptPubKey.
-        CBitcoinAddress redeemScriptAddr(scriptPubKey);
-        scriptPubKey = GetScriptForDestination(redeemScriptAddr.Get());
+        // Get the ID for the script, and then construct a P2SH destination for it.
+        scriptPubKey = GetScriptForDestination(CScriptID(scriptPubKey));
     }
 
     // construct TxOut, append to transaction output list
@@ -381,10 +379,8 @@ static void MutateTxAddOutMultiSig(CMutableTransaction& tx, const std::string& s
         scriptPubKey = GetScriptForWitness(scriptPubKey);
     }
     if (bScriptHash) {
-        // Get the address for the redeem script, then call
-        // GetScriptForDestination() to construct a P2SH scriptPubKey.
-        CBitcoinAddress addr(scriptPubKey);
-        scriptPubKey = GetScriptForDestination(addr.Get());
+        // Get the ID for the script, and then construct a P2SH destination for it.
+        scriptPubKey = GetScriptForDestination(CScriptID(scriptPubKey));
     }
 
     // construct TxOut, append to transaction output list
@@ -444,11 +440,10 @@ static void MutateTxAddOutScript(CMutableTransaction& tx, const std::string& str
     }
 
     if (bSegWit) {
-      scriptPubKey = GetScriptForWitness(scriptPubKey);
+        scriptPubKey = GetScriptForWitness(scriptPubKey);
     }
     if (bScriptHash) {
-      CBitcoinAddress addr(scriptPubKey);
-      scriptPubKey = GetScriptForDestination(addr.Get());
+        scriptPubKey = GetScriptForDestination(CScriptID(scriptPubKey));
     }
 
     // construct TxOut, append to transaction output list

src/core_write.cpp

@@ -148,8 +148,9 @@ void ScriptPubKeyToUniv(const CScript& scriptPubKey,
     out.pushKV("type", GetTxnOutputType(type));
 
     UniValue a(UniValue::VARR);
-    for (const CTxDestination& addr : addresses)
-        a.push_back(CBitcoinAddress(addr).ToString());
+    for (const CTxDestination& addr : addresses) {
+        a.push_back(EncodeDestination(addr));
+    }
     out.pushKV("addresses", a);
 }
 

src/qt/addresstablemodel.cpp

@@ -82,14 +82,14 @@ class AddressTablePriv
             LOCK(wallet->cs_wallet);
             for (const std::pair<CTxDestination, CAddressBookData>& item : wallet->mapAddressBook)
             {
-                const CBitcoinAddress& address = item.first;
-                bool fMine = IsMine(*wallet, address.Get());
+                const CTxDestination& address = item.first;
+                bool fMine = IsMine(*wallet, address);
                 AddressTableEntry::Type addressType = translateTransactionType(
                         QString::fromStdString(item.second.purpose), fMine);
                 const std::string& strName = item.second.name;
                 cachedAddressTable.append(AddressTableEntry(addressType,
                                   QString::fromStdString(strName),
-                                  QString::fromStdString(address.ToString())));
+                                  QString::fromStdString(EncodeDestination(address))));
             }
         }
         // qLowerBound() and qUpperBound() require our cachedAddressTable list to be sorted in asc order
@@ -246,7 +246,7 @@ bool AddressTableModel::setData(const QModelIndex &index, const QVariant &value,
     if(role == Qt::EditRole)
     {
         LOCK(wallet->cs_wallet); /* For SetAddressBook / DelAddressBook */
-        CTxDestination curAddress = CBitcoinAddress(rec->address.toStdString()).Get();
+        CTxDestination curAddress = DecodeDestination(rec->address.toStdString());
         if(index.column() == Label)
         {
             // Do nothing, if old label == new label
@@ -257,7 +257,7 @@ bool AddressTableModel::setData(const QModelIndex &index, const QVariant &value,
             }
             wallet->SetAddressBook(curAddress, value.toString().toStdString(), strPurpose);
         } else if(index.column() == Address) {
-            CTxDestination newAddress = CBitcoinAddress(value.toString().toStdString()).Get();
+            CTxDestination newAddress = DecodeDestination(value.toString().toStdString());
             // Refuse to set invalid address, set error status and return false
             if(boost::get<CNoDestination>(&newAddress))
             {
@@ -358,7 +358,7 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
         // Check for duplicate addresses
         {
             LOCK(wallet->cs_wallet);
-            if(wallet->mapAddressBook.count(CBitcoinAddress(strAddress).Get()))
+            if(wallet->mapAddressBook.count(DecodeDestination(strAddress)))
             {
                 editStatus = DUPLICATE_ADDRESS;
                 return QString();
@@ -384,7 +384,7 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
                 return QString();
             }
         }
-        strAddress = CBitcoinAddress(newKey.GetID()).ToString();
+        strAddress = EncodeDestination(newKey.GetID());
     }
     else
     {
@@ -394,7 +394,7 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
     // Add entry
     {
         LOCK(wallet->cs_wallet);
-        wallet->SetAddressBook(CBitcoinAddress(strAddress).Get(), strLabel,
+        wallet->SetAddressBook(DecodeDestination(strAddress), strLabel,
                                (type == Send ? "send" : "receive"));
     }
     return QString::fromStdString(strAddress);
@@ -412,7 +412,7 @@ bool AddressTableModel::removeRows(int row, int count, const QModelIndex &parent
     }
     {
         LOCK(wallet->cs_wallet);
-        wallet->DelAddressBook(CBitcoinAddress(rec->address.toStdString()).Get());
+        wallet->DelAddressBook(DecodeDestination(rec->address.toStdString()));
     }
     return true;
 }
@@ -423,8 +423,8 @@ QString AddressTableModel::labelForAddress(const QString &address) const
 {
     {
         LOCK(wallet->cs_wallet);
-        CBitcoinAddress address_parsed(address.toStdString());
-        std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(address_parsed.Get());
+        CTxDestination destination = DecodeDestination(address.toStdString());
+        std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(destination);
         if (mi != wallet->mapAddressBook.end())
         {
             return QString::fromStdString(mi->second.name);

src/qt/bitcoinaddressvalidator.cpp

@@ -89,9 +89,9 @@ QValidator::State BitcoinAddressCheckValidator::validate(QString &input, int &po
 {
     Q_UNUSED(pos);
     // Validate the passed Bitcoin address
-    CBitcoinAddress addr(input.toStdString());
-    if (addr.IsValid())
+    if (IsValidDestinationString(input.toStdString())) {
         return QValidator::Acceptable;
+    }
 
     return QValidator::Invalid;
 }

src/qt/coincontroldialog.cpp

@@ -660,7 +660,7 @@ void CoinControlDialog::updateView()
             QString sAddress = "";
             if(ExtractDestination(out.tx->tx->vout[out.i].scriptPubKey, outputAddress))
             {
-                sAddress = QString::fromStdString(CBitcoinAddress(outputAddress).ToString());
+                sAddress = QString::fromStdString(EncodeDestination(outputAddress));
 
                 // if listMode or change => show bitcoin address. In tree mode, address is not shown again for direct wallet address outputs
                 if (!treeMode || (!(sAddress == sWalletAddress)))

src/qt/guiutil.cpp

@@ -112,8 +112,9 @@ static std::string DummyAddress(const CChainParams &params)
     sourcedata.insert(sourcedata.end(), dummydata, dummydata + sizeof(dummydata));
     for(int i=0; i<256; ++i) { // Try every trailing byte
         std::string s = EncodeBase58(sourcedata.data(), sourcedata.data() + sourcedata.size());
-        if (!CBitcoinAddress(s).IsValid())
+        if (!IsValidDestinationString(s)) {
             return s;
+        }
         sourcedata[sourcedata.size()-1] += 1;
     }
     return "";
@@ -248,7 +249,7 @@ QString formatBitcoinURI(const SendCoinsRecipient &info)
 
 bool isDust(const QString& address, const CAmount& amount)
 {
-    CTxDestination dest = CBitcoinAddress(address.toStdString()).Get();
+    CTxDestination dest = DecodeDestination(address.toStdString());
     CScript script = GetScriptForDestination(dest);
     CTxOut txOut(amount, script);
     return IsDust(txOut, ::dustRelayFee);

src/qt/paymentserver.cpp

@@ -218,17 +218,15 @@ void PaymentServer::ipcParseCommandLine(int argc, char* argv[])
             SendCoinsRecipient r;
             if (GUIUtil::parseBitcoinURI(arg, &r) && !r.address.isEmpty())
             {
-                CBitcoinAddress address(r.address.toStdString());
                 auto tempChainParams = CreateChainParams(CBaseChainParams::MAIN);
 
-                if (address.IsValid(*tempChainParams))
-                {
+                if (IsValidDestinationString(r.address.toStdString(), *tempChainParams)) {
                     SelectParams(CBaseChainParams::MAIN);
-                }
-                else {
+                } else {
                     tempChainParams = CreateChainParams(CBaseChainParams::TESTNET);
-                    if (address.IsValid(*tempChainParams))
+                    if (IsValidDestinationString(r.address.toStdString(), *tempChainParams)) {
                         SelectParams(CBaseChainParams::TESTNET);
+                    }
                 }
             }
         }
@@ -441,8 +439,7 @@ void PaymentServer::handleURIOrFile(const QString& s)
             SendCoinsRecipient recipient;
             if (GUIUtil::parseBitcoinURI(s, &recipient))
             {
-                CBitcoinAddress address(recipient.address.toStdString());
-                if (!address.IsValid()) {
+                if (!IsValidDestinationString(recipient.address.toStdString())) {
                     Q_EMIT message(tr("URI handling"), tr("Invalid payment address %1").arg(recipient.address),
                         CClientUIInterface::MSG_ERROR);
                 }
@@ -560,7 +557,7 @@ bool PaymentServer::processPaymentRequest(const PaymentRequestPlus& request, Sen
         CTxDestination dest;
         if (ExtractDestination(sendingTo.first, dest)) {
             // Append destination address
-            addresses.append(QString::fromStdString(CBitcoinAddress(dest).ToString()));
+            addresses.append(QString::fromStdString(EncodeDestination(dest)));
         }
         else if (!recipient.authenticatedMerchant.isEmpty()) {
             // Unauthenticated payment requests to custom bitcoin addresses are not supported

src/qt/sendcoinsdialog.cpp

@@ -777,19 +777,18 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
         CoinControlDialog::coinControl->destChange = CNoDestination();
         ui->labelCoinControlChangeLabel->setStyleSheet("QLabel{color:red;}");
 
-        CBitcoinAddress addr = CBitcoinAddress(text.toStdString());
+        const CTxDestination dest = DecodeDestination(text.toStdString());
 
         if (text.isEmpty()) // Nothing entered
         {
             ui->labelCoinControlChangeLabel->setText("");
         }
-        else if (!addr.IsValid()) // Invalid address
+        else if (!IsValidDestination(dest)) // Invalid address
         {
             ui->labelCoinControlChangeLabel->setText(tr("Warning: Invalid Bitcoin address"));
         }
         else // Valid address
         {
-            const CTxDestination dest = addr.Get();
             if (!model->IsSpendable(dest)) {
                 ui->labelCoinControlChangeLabel->setText(tr("Warning: Unknown change address"));