UI external signer support (e.g. hardware wallet)

src/interfaces/wallet.h

@@ -258,6 +258,9 @@ class Wallet
     // Return whether private keys enabled.
     virtual bool privateKeysDisabled() = 0;
 
+    // Return whether wallet uses an external signer.
+    virtual bool hasExternalSigner() = 0;
+
     // Get default address type.
     virtual OutputType getDefaultAddressType() = 0;
 

src/qt/forms/receiverequestdialog.ui

@@ -254,6 +254,19 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QPushButton" name="btnVerify">
+       <property name="text">
+        <string>&amp;Verify</string>
+       </property>
+       <property name="toolTip">
+        <string>Verify this address on e.g. a hardware wallet screen</string>
+       </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
      <item>
       <widget class="QPushButton" name="btnSaveAs">
        <property name="text">

src/qt/receiverequestdialog.cpp

@@ -89,6 +89,12 @@ void ReceiveRequestDialog::setInfo(const SendCoinsRecipient &_info)
         ui->wallet_tag->hide();
         ui->wallet_content->hide();
     }
+
+    ui->btnVerify->setVisible(this->model->wallet().hasExternalSigner());
+
+    connect(ui->btnVerify, &QPushButton::clicked, [this] {
+        model->displayAddress(info.address.toStdString());
+    });
 }
 
 void ReceiveRequestDialog::updateDisplayUnit()

src/qt/walletmodel.cpp

@@ -571,6 +571,18 @@ bool WalletModel::bumpFee(uint256 hash, uint256& new_hash)
     return true;
 }
 
+bool WalletModel::displayAddress(std::string sAddress)
+{
+    CTxDestination dest = DecodeDestination(sAddress);
+    bool res = false;
+    try {
+        res = m_wallet->displayAddress(dest);
+    } catch (const std::runtime_error& e) {
+        QMessageBox::critical(nullptr, tr("Can't display address"), e.what());
+    }
+    return res;
+}
+
 bool WalletModel::isWalletEnabled()
 {
    return !gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET);

src/qt/walletmodel.h

@@ -139,6 +139,7 @@ class WalletModel : public QObject
     bool saveReceiveRequest(const std::string &sAddress, const int64_t nId, const std::string &sRequest);
 
     bool bumpFee(uint256 hash, uint256& new_hash);
+    bool displayAddress(std::string sAddress);
 
     static bool isWalletEnabled();
 

src/wallet/interfaces.cpp

@@ -459,6 +459,7 @@ class WalletImpl : public Wallet
     unsigned int getConfirmTarget() override { return m_wallet->m_confirm_target; }
     bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
     bool canGetAddresses() override { return m_wallet->CanGetAddresses(); }
+    bool hasExternalSigner() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER); }
     bool privateKeysDisabled() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS); }
     OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }
     CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }