gui: Menu action for exporting a watchonly wallet

Author: achow101

src/interfaces/wallet.h

@@ -310,6 +310,9 @@ class Wallet
 
     //! Return pointer to internal wallet class, useful for testing.
     virtual wallet::CWallet* wallet() { return nullptr; }
+
+    //! Export a watchonly wallet file. See CWallet::ExportWatchOnlyWallet
+    virtual util::Result<std::string> exportWatchOnlyWallet(const fs::path& destination) = 0;
 };
 
 //! Wallet chain client that in addition to having chain client methods for

src/qt/bitcoingui.cpp

@@ -371,6 +371,10 @@ void BitcoinGUI::createActions()
     m_mask_values_action->setStatusTip(tr("Mask the values in the Overview tab"));
     m_mask_values_action->setCheckable(true);
 
+    m_export_watchonly_action = new QAction(tr("Export watch-only wallet"), this);
+    m_export_watchonly_action->setEnabled(false);
+    m_export_watchonly_action->setStatusTip(tr("Export a watch-only version of the current wallet that can be restored onto another node."));
+
     connect(quitAction, &QAction::triggered, this, &BitcoinGUI::quitRequested);
     connect(aboutAction, &QAction::triggered, this, &BitcoinGUI::aboutClicked);
     connect(aboutQtAction, &QAction::triggered, qApp, QApplication::aboutQt);
@@ -484,6 +488,11 @@ void BitcoinGUI::createActions()
         });
         connect(m_mask_values_action, &QAction::toggled, this, &BitcoinGUI::setPrivacy);
         connect(m_mask_values_action, &QAction::toggled, this, &BitcoinGUI::enableHistoryAction);
+        connect(m_export_watchonly_action, &QAction::triggered, [this] {
+            QString destination = GUIUtil::getSaveFileName(this, tr("Save Watch-only Wallet Export"), QString(), QString(), nullptr);
+            if (destination.isEmpty()) return;
+            walletFrame->currentWalletModel()->wallet().exportWatchOnlyWallet(GUIUtil::QStringToPath(destination));
+        });
     }
 #endif // ENABLE_WALLET
 
@@ -507,6 +516,7 @@ void BitcoinGUI::createMenuBar()
         file->addSeparator();
         file->addAction(backupWalletAction);
         file->addAction(m_restore_wallet_action);
+        file->addAction(m_export_watchonly_action);
         file->addSeparator();
         file->addAction(openAction);
         file->addAction(signMessageAction);
@@ -715,6 +725,7 @@ void BitcoinGUI::setWalletController(WalletController* wallet_controller, bool s
     m_restore_wallet_action->setEnabled(true);
     m_migrate_wallet_action->setEnabled(true);
     m_migrate_wallet_action->setMenu(m_migrate_wallet_menu);
+    m_export_watchonly_action->setEnabled(true);
 
     GUIUtil::ExceptionSafeConnect(wallet_controller, &WalletController::walletAdded, this, &BitcoinGUI::addWallet);
     connect(wallet_controller, &WalletController::walletRemoved, this, &BitcoinGUI::removeWallet);

src/qt/bitcoingui.h

@@ -163,6 +163,7 @@ class BitcoinGUI : public QMainWindow
     QAction* m_mask_values_action{nullptr};
     QAction* m_migrate_wallet_action{nullptr};
     QMenu* m_migrate_wallet_menu{nullptr};
+    QAction* m_export_watchonly_action{nullptr};
 
     QLabel *m_wallet_selector_label = nullptr;
     QComboBox* m_wallet_selector = nullptr;

src/wallet/interfaces.cpp

@@ -541,6 +541,11 @@ class WalletImpl : public Wallet
     }
     CWallet* wallet() override { return m_wallet.get(); }
 
+    util::Result<std::string> exportWatchOnlyWallet(const fs::path& destination) override {
+        LOCK(m_wallet->cs_wallet);
+        return m_wallet->ExportWatchOnlyWallet(destination, m_context);
+    }
+
     WalletContext& m_context;
     std::shared_ptr<CWallet> m_wallet;
 };