(WIP) Namecoin: Add Renew to Qt GUI context menu

Depends on #353 and #373, do not merge this until those are merged and
this PR is rebased.

TODO: Untested.

Based on namecoin#187 by Brandon
Roberts.

src/qt/forms/managenamespage.ui

@@ -161,7 +161,7 @@ to the network and creates a pending name_firstupdate transaction.</string>
          <bool>true</bool>
         </property>
         <property name="selectionMode">
-         <enum>QAbstractItemView::SingleSelection</enum>
+         <enum>QAbstractItemView::ExtendedSelection</enum>
         </property>
         <property name="selectionBehavior">
          <enum>QAbstractItemView::SelectRows</enum>

src/qt/managenamespage.cpp

@@ -32,15 +32,18 @@ ManageNamesPage::ManageNamesPage(const PlatformStyle *platformStyle, QWidget *pa
     // Context menu actions
     QAction *copyNameAction = new QAction(tr("Copy &Name"), this);
     QAction *copyValueAction = new QAction(tr("Copy &Value"), this);
+    QAction *renewNameAction = new QAction(tr("&Renew Name"), this);
 
     // Build context menu
     contextMenu = new QMenu();
     contextMenu->addAction(copyNameAction);
     contextMenu->addAction(copyValueAction);
+    contextMenu->addAction(renewNameAction);
 
     // Connect signals for context menu actions
     connect(copyNameAction, &QAction::triggered, this, &ManageNamesPage::onCopyNameAction);
     connect(copyValueAction, &QAction::triggered, this, &ManageNamesPage::onCopyValueAction);
+    connect(renewNameAction, &QAction::triggered, this, &ManageNamesPage::onRenewNameAction);
 
     connect(ui->tableView, &QTableView::customContextMenuRequested, this, &ManageNamesPage::contextualMenu);
     ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
@@ -120,6 +123,54 @@ void ManageNamesPage::onCopyValueAction()
     GUIUtil::copyEntryData(ui->tableView, NameTableModel::Value);
 }
 
+void ManageNamesPage::onRenewNameAction()
+{
+    QModelIndexList indexes = GUIUtil::getEntryData(ui->tableView, NameTableModel::Name);
+
+    if (indexes.isEmpty())
+        return;
+
+    QString msg;
+    QString title;
+
+    if (indexes.size() == 1)
+    {
+        const QString &name = indexes.at(0).data(Qt::EditRole).toString();
+
+        msg = tr ("Are you sure you want to renew the name <b>%1</b>?")
+            .arg (GUIUtil::HtmlEscape (name));
+        title = tr ("Confirm name renewal");
+    }
+    else
+    {
+        msg = tr ("Are you sure you want to renew multiple names simultaneously?  This will reveal common ownership of the renewed names (bad for anonymity).");
+        title = tr ("Confirm multiple name renewal");
+    }
+
+    QMessageBox::StandardButton res;
+    res = QMessageBox::question (this, title, msg,
+                                 QMessageBox::Yes | QMessageBox::Cancel,
+                                 QMessageBox::Cancel);
+    if (res != QMessageBox::Yes)
+        return;
+
+    WalletModel::UnlockContext ctx(walletModel->requestUnlock ());
+    if (!ctx.isValid ())
+        return;
+
+    for (QModelIndexList::iterator i = indexes.begin(); i != items.end(); i++)
+    {
+        const QString &name = i.data(Qt::EditRole).toString();
+
+        const QString err_msg = model->renew(name);
+        if (!err_msg.isEmpty() && err_msg != "ABORTED")
+        {
+            QMessageBox::critical(this, tr("Name renew error"), err_msg);
+            return;
+        }
+    }
+}
+
 void ManageNamesPage::exportClicked()
 {
     // CSV is currently the only supported format

src/qt/managenamespage.h

@@ -51,6 +51,7 @@ private Q_SLOTS:
 
     void onCopyNameAction();
     void onCopyValueAction();
+    void onRenewNameAction();
 };
 
 #endif // MANAGENAMESPAGE_H

src/qt/nametablemodel.cpp

@@ -281,3 +281,31 @@ NameTableModel::emitDataChanged(int idx)
     //emit
     dataChanged(index(idx, 0), index(idx, columns.length()-1));
 }
+
+QString NameTableModel::renew(const QString &name)
+{
+    std::string strName = name.toStdString();
+    LogPrintf ("wallet attempting name_update: name=%s\n", strName);
+
+    UniValue params(UniValue::VOBJ);
+    params.pushKV ("name", strName);
+
+    util::Ref nameUpdateContext;
+    JSONRPCRequest nameUpdateRequest(nameUpdateContext);
+    nameUpdateRequest.URI = ("/wallet/" + walletModel->getWalletName()).toStdString();
+    nameUpdateRequest.strMethod = "name_update";
+    nameUpdateRequest.params = params;
+    nameUpdateRequest.fHelp = false;
+
+    UniValue res;
+    try {
+       res = tableRPC.execute(nameUpdateRequest);
+    }
+    catch (const UniValue& e) {
+        UniValue message = find_value( e, "message");
+        std::string errorStr = message.get_str();
+        LogPrintf ("name_update error: %s\n", errorStr);
+        return QString::fromStdString(errorStr);
+    }
+    return tr ("");
+}

src/qt/nametablemodel.h

@@ -49,6 +49,8 @@ class NameTableModel : public QAbstractTableModel
     Qt::ItemFlags flags(const QModelIndex &index) const;
     /*@}*/
 
+    QString renew(const QString &name) const;
+
 private:
     WalletModel *walletModel;
     std::unique_ptr<interfaces::Handler> m_handler_transaction_changed;