gui: Use wallet name for wallet migration rather than WalletModel

To prepare for migrating wallets that are not loaded, when migration
occurs in the GUI, it should not rely on a WalletModel existing.

Author: achow101

src/qt/askpassphrasedialog.cpp

@@ -44,6 +44,7 @@ AskPassphraseDialog::AskPassphraseDialog(Mode _mode, QWidget *parent, SecureStri
             ui->passEdit1->hide();
             setWindowTitle(tr("Encrypt wallet"));
             break;
+        case UnlockMigration:
         case Unlock: // Ask passphrase
             ui->warningLabel->setText(tr("This operation needs your wallet passphrase to unlock the wallet."));
             ui->passLabel2->hide();
@@ -80,7 +81,7 @@ void AskPassphraseDialog::setModel(WalletModel *_model)
 void AskPassphraseDialog::accept()
 {
     SecureString oldpass, newpass1, newpass2;
-    if (!model && mode != Encrypt)
+    if (!model && mode != Encrypt && mode != UnlockMigration)
         return;
     oldpass.reserve(MAX_PASSPHRASE_SIZE);
     newpass1.reserve(MAX_PASSPHRASE_SIZE);
@@ -181,6 +182,10 @@ void AskPassphraseDialog::accept()
             QMessageBox::critical(this, tr("Wallet unlock failed"), e.what());
         }
         break;
+    case UnlockMigration:
+        Assume(m_passphrase_out)->assign(oldpass);
+        QDialog::accept();
+        break;
     case ChangePass:
         if(newpass1 == newpass2)
         {
@@ -224,6 +229,7 @@ void AskPassphraseDialog::textChanged()
     case Encrypt: // New passphrase x2
         acceptable = !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
         break;
+    case UnlockMigration:
     case Unlock: // Old passphrase x1
         acceptable = !ui->passEdit1->text().isEmpty();
         break;

src/qt/askpassphrasedialog.h

@@ -26,6 +26,7 @@ class AskPassphraseDialog : public QDialog
         Encrypt,    /**< Ask passphrase twice and encrypt */
         Unlock,     /**< Ask passphrase and unlock */
         ChangePass, /**< Ask old passphrase + new passphrase twice */
+        UnlockMigration, // Ask passphrase for unlocking during migration
     };
 
     explicit AskPassphraseDialog(Mode mode, QWidget *parent, SecureString* passphrase_out = nullptr);

src/qt/bitcoingui.cpp

@@ -459,7 +459,7 @@ void BitcoinGUI::createActions()
         connect(m_migrate_wallet_action, &QAction::triggered, [this] {
             auto activity = new MigrateWalletActivity(m_wallet_controller, this);
             connect(activity, &MigrateWalletActivity::migrated, this, &BitcoinGUI::setCurrentWallet);
-            activity->migrate(walletFrame->currentWalletModel());
+            activity->migrate(walletFrame->currentWalletModel()->wallet().getWalletName());
         });
         connect(m_mask_values_action, &QAction::toggled, this, &BitcoinGUI::setPrivacy);
         connect(m_mask_values_action, &QAction::toggled, this, &BitcoinGUI::enableHistoryAction);

src/qt/walletcontroller.cpp

@@ -170,6 +170,15 @@ WalletModel* WalletController::getOrCreateWallet(std::unique_ptr<interfaces::Wal
     return wallet_model;
 }
 
+WalletModel* WalletController::getWallet(const std::string& name)
+{
+    auto it = std::find_if(m_wallets.begin(), m_wallets.end(),
+                            [&name](WalletModel* model) {
+                                return name == model->wallet().getWalletName();
+                            });
+    return it == m_wallets.end() ? nullptr : *it;
+}
+
 void WalletController::removeAndDeleteWallet(WalletModel* wallet_model)
 {
     // Unregister wallet model.
@@ -435,34 +444,37 @@ void RestoreWalletActivity::finish()
     Q_EMIT finished();
 }
 
-void MigrateWalletActivity::migrate(WalletModel* wallet_model)
+void MigrateWalletActivity::migrate(const std::string& name)
 {
     // Warn the user about migration
     QMessageBox box(m_parent_widget);
     box.setWindowTitle(tr("Migrate wallet"));
-    box.setText(tr("Are you sure you wish to migrate the wallet <i>%1</i>?").arg(GUIUtil::HtmlEscape(wallet_model->getDisplayName())));
+    box.setText(tr("Are you sure you wish to migrate the wallet <i>%1</i>?").arg(GUIUtil::HtmlEscape(GUIUtil::WalletDisplayName(name))));
     box.setInformativeText(tr("Migrating the wallet will convert this wallet to one or more descriptor wallets. A new wallet backup will need to be made.\n"
                 "If this wallet contains any watchonly scripts, a new wallet will be created which contains those watchonly scripts.\n"
                 "If this wallet contains any solvable but not watched scripts, a different and new wallet will be created which contains those scripts.\n\n"
                 "The migration process will create a backup of the wallet before migrating. This backup file will be named "
                 "<wallet name>-<timestamp>.legacy.bak and can be found in the directory for this wallet. In the event of "
-                "an incorrect migration, the backup can be restored with the \"Restore Wallet\" functionality."));
-    box.setStandardButtons(QMessageBox::Yes|QMessageBox::Cancel);
-    box.setDefaultButton(QMessageBox::Yes);
-    if (box.exec() != QMessageBox::Yes) return;
+                "an incorrect migration, the backup can be restored with the \"Restore Wallet\" functionality.\n\n"
+                "If your wallet is encrypted, please provide the passphrase now as by choosing \"Yes, encrypted\"."));
+    QPushButton* yes_enc_button = box.addButton(tr("Yes, encrypted"), QMessageBox::YesRole);
+    QPushButton* yes_button = box.addButton(QMessageBox::Yes);
+    QPushButton* cancel_button = box.addButton(QMessageBox::Cancel);
+    box.setDefaultButton(yes_button);
+    box.exec();
+    if (!box.clickedButton() || box.clickedButton() == (QAbstractButton*)cancel_button) return;
 
-    // Get the passphrase if it is encrypted regardless of it is locked or unlocked. We need the passphrase itself.
     SecureString passphrase;
-    WalletModel::EncryptionStatus enc_status = wallet_model->getEncryptionStatus();
-    if (enc_status == WalletModel::EncryptionStatus::Locked || enc_status == WalletModel::EncryptionStatus::Unlocked) {
-        AskPassphraseDialog dlg(AskPassphraseDialog::Unlock, m_parent_widget, &passphrase);
-        dlg.setModel(wallet_model);
-        dlg.exec();
+    if (box.clickedButton() == (QAbstractButton*)yes_enc_button) {
+        // Get the passphrase for the wallet
+        AskPassphraseDialog dlg(AskPassphraseDialog::UnlockMigration, m_parent_widget, &passphrase);
+        if (dlg.exec() == QDialog::Rejected) return;
     }
 
     // GUI needs to remove the wallet so that it can actually be unloaded by migration
-    const std::string name = wallet_model->wallet().getWalletName();
-    m_wallet_controller->removeAndDeleteWallet(wallet_model);
+    if (WalletModel* wallet = m_wallet_controller->getWallet(name)) {
+        m_wallet_controller->removeAndDeleteWallet(wallet);
+    };
 
     showProgressDialog(tr("Migrate Wallet"), tr("Migrating Wallet <b>%1</b>…").arg(GUIUtil::HtmlEscape(name)));
 

src/qt/walletcontroller.h

@@ -58,6 +58,7 @@ class WalletController : public QObject
     ~WalletController();
 
     WalletModel* getOrCreateWallet(std::unique_ptr<interfaces::Wallet> wallet);
+    WalletModel* getWallet(const std::string& name);
 
     //! Returns all wallet names in the wallet dir mapped to whether the wallet
     //! is loaded.
@@ -66,8 +67,6 @@ class WalletController : public QObject
     void closeWallet(WalletModel* wallet_model, QWidget* parent = nullptr);
     void closeAllWallets(QWidget* parent = nullptr);
 
-    void migrateWallet(WalletModel* wallet_model, QWidget* parent = nullptr);
-
 Q_SIGNALS:
     void walletAdded(WalletModel* wallet_model);
     void walletRemoved(WalletModel* wallet_model);
@@ -186,7 +185,7 @@ class MigrateWalletActivity : public WalletControllerActivity
 public:
     MigrateWalletActivity(WalletController* wallet_controller, QWidget* parent) : WalletControllerActivity(wallet_controller, parent) {}
 
-    void migrate(WalletModel* wallet_model);
+    void migrate(const std::string& path);
 
 Q_SIGNALS:
     void migrated(WalletModel* wallet_model);