Add QR code generator for TOTP export (#1167)

* Resolves #764
* Add libqrencode and qtsvg dependencies 
* Ensure QR code remains square
* Auto-close QR code dialog when database is locked
* Add databaseLocked() Signal to databaseWidget
* Correct otpauth URI output in Totp::writeSettings(...)

CMakeLists.txt

@@ -294,16 +294,16 @@ endif(WITH_TESTS)
 include(CLangFormat)
 
 if(UNIX AND NOT APPLE)
-  find_package(Qt5 COMPONENTS Core Network Concurrent Widgets Test LinguistTools DBus REQUIRED)
+  find_package(Qt5 COMPONENTS Core Network Concurrent Widgets Svg Test LinguistTools DBus REQUIRED)
 elseif(APPLE)
-  find_package(Qt5 COMPONENTS Core Network Concurrent Widgets Test LinguistTools REQUIRED
+  find_package(Qt5 COMPONENTS Core Network Concurrent Widgets Svg Test LinguistTools REQUIRED
     HINTS /usr/local/Cellar/qt/*/lib/cmake ENV PATH
   )
   find_package(Qt5 COMPONENTS MacExtras
     HINTS /usr/local/Cellar/qt/*/lib/cmake ENV PATH
   )
 else()
-  find_package(Qt5 COMPONENTS Core Network Concurrent Widgets Test LinguistTools REQUIRED)
+  find_package(Qt5 COMPONENTS Core Network Concurrent Widgets Svg Test LinguistTools REQUIRED)
 endif()
 
 if(Qt5Core_VERSION VERSION_LESS "5.2.0")
@@ -339,6 +339,8 @@ find_package(Argon2 REQUIRED)
 
 find_package(ZLIB REQUIRED)
 
+find_package(QREncode REQUIRED)
+
 set(CMAKE_REQUIRED_INCLUDES ${ZLIB_INCLUDE_DIR})
 
 if(ZLIB_VERSION_STRING VERSION_LESS "1.2.0")

Dockerfile

@@ -16,7 +16,7 @@
 
 FROM ubuntu:14.04
 
-ENV REBUILD_COUNTER=8
+ENV REBUILD_COUNTER=10
 
 ENV QT5_VERSION=qt510
 ENV QT5_PPA_VERSION=qt-5.10.1
@@ -50,12 +50,14 @@ RUN set -x \
         ${QT5_VERSION}x11extras \
         ${QT5_VERSION}translations \
         ${QT5_VERSION}imageformats \
+        ${QT5_VERSION}svg \
         zlib1g-dev \
         libxi-dev \
         libxtst-dev \
         mesa-common-dev \
         libyubikey-dev \
-        libykpers-1-dev
+        libykpers-1-dev \
+        libqrencode-dev
 
 ENV PATH="/opt/${QT5_VERSION}/bin:${PATH}"
 ENV CMAKE_PREFIX_PATH="/opt/${QT5_VERSION}/lib/cmake"

ci/trusty/Dockerfile

@@ -18,7 +18,7 @@
 
 FROM ubuntu:14.04
 
-ENV REBUILD_COUNTER=4
+ENV REBUILD_COUNTER=5
 
 ENV QT5_VERSION=qt53
 ENV QT5_PPA_VERSION=${QT5_VERSION}2
@@ -49,11 +49,13 @@ RUN set -x \
         ${QT5_VERSION}tools \
         ${QT5_VERSION}x11extras \
         ${QT5_VERSION}translations \
+        ${QT5_VERSION}svg \
         zlib1g-dev \
         libyubikey-dev \
         libykpers-1-dev \
         libxi-dev \
         libxtst-dev \
+        libqrencode-dev \
         xvfb
 
 ENV PATH="/opt/${QT5_VERSION}/bin:${PATH}"

cmake/FindQREncode.cmake

@@ -0,0 +1,22 @@
+#  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 2 or (at your option)
+#  version 3 of the License.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+find_path(QRENCODE_INCLUDE_DIR qrencode.h)
+find_library(QRENCODE_LIBRARY qrencode)
+
+mark_as_advanced(QRENCODE_LIBRARY QRENCODE_INCLUDE_DIR)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(QREncode DEFAULT_MSG QRENCODE_LIBRARY QRENCODE_INCLUDE_DIR)

snapcraft.yaml

@@ -39,6 +39,7 @@ parts:
       - libgcrypt20-dev
       - libqt5x11extras5-dev
       - qtbase5-dev
+      - qtsvg5-dev
       - qttools5-dev
       - qttools5-dev-tools
       - zlib1g-dev
@@ -48,6 +49,7 @@ parts:
       - libykpers-1-dev
       - libsodium-dev
       - libargon2-0-dev
+      - libqrencode-dev
     stage-packages:
       - dbus
       - qttranslations5-l10n # common translations

src/CMakeLists.txt

@@ -127,8 +127,10 @@ set(keepassx_SOURCES
     gui/ApplicationSettingsWidget.cpp
     gui/SearchWidget.cpp
     gui/SortFilterHideProxyModel.cpp
+    gui/SquareSvgWidget.cpp
     gui/TotpSetupDialog.cpp
     gui/TotpDialog.cpp
+    gui/TotpExportSettingsDialog.cpp
     gui/UnlockDatabaseWidget.cpp
     gui/UnlockDatabaseDialog.cpp
     gui/WelcomeWidget.cpp
@@ -225,6 +227,8 @@ endif()
 
 add_subdirectory(autotype)
 add_subdirectory(cli)
+add_subdirectory(qrcode)
+set(qrcode_LIB qrcode)
 
 add_subdirectory(sshagent)
 if(WITH_XC_SSHAGENT)
@@ -270,9 +274,10 @@ target_link_libraries(keepassx_core
                       autotype
                       ${keepassxcbrowser_LIB}
                       ${sshagent_LIB}
+                      ${qrcode_LIB}
                       Qt5::Core
-                      Qt5::Network
                       Qt5::Concurrent
+                      Qt5::Network
                       Qt5::Widgets
                       ${CURL_LIBRARIES}
                       ${YUBIKEY_LIBRARIES}
@@ -280,7 +285,9 @@ target_link_libraries(keepassx_core
                       ${ARGON2_LIBRARIES}
                       ${GCRYPT_LIBRARIES}
                       ${GPGERROR_LIBRARIES}
-                      ${ZLIB_LIBRARIES})
+                      ${YUBIKEY_LIBRARIES}
+                      ${ZLIB_LIBRARIES}
+                      ${ZXCVBN_LIBRARIES})
 
 if(APPLE)
     target_link_libraries(keepassx_core "-framework Foundation")

src/core/Entry.cpp

@@ -369,7 +369,7 @@ void Entry::setTotp(QSharedPointer<Totp::Settings> settings)
     beginUpdate();
     m_data.totpSettings = settings;
 
-    auto text = Totp::writeSettings(m_data.totpSettings);
+    auto text = Totp::writeSettings(m_data.totpSettings, title(), username());
     if (m_attributes->hasKey(Totp::ATTRIBUTE_OTP)) {
         m_attributes->set(Totp::ATTRIBUTE_OTP, text, true);
     } else {

src/gui/DatabaseWidget.cpp

@@ -49,6 +49,7 @@
 #include "gui/MessageBox.h"
 #include "gui/TotpSetupDialog.h"
 #include "gui/TotpDialog.h"
+#include "gui/TotpExportSettingsDialog.h"
 #include "gui/UnlockDatabaseDialog.h"
 #include "gui/UnlockDatabaseWidget.h"
 #include "gui/entry/EditEntryWidget.h"
@@ -572,6 +573,18 @@ void DatabaseWidget::copyAttribute(QAction* action)
         currentEntry->resolveMultiplePlaceholders(currentEntry->attributes()->value(action->data().toString())));
 }
 
+void DatabaseWidget::showTotpKeyQrCode()
+{
+    Entry* currentEntry = m_entryView->currentEntry();
+    Q_ASSERT(currentEntry);
+    if (!currentEntry) {
+        return;
+    }
+
+    auto totpDisplayDialog = new TotpExportSettingsDialog(this, currentEntry);
+    totpDisplayDialog->open();
+}
+
 void DatabaseWidget::setClipboardTextAndMinimize(const QString& text)
 {
     clipboard()->setText(text);
@@ -1171,6 +1184,7 @@ void DatabaseWidget::lock()
     Database* newDb = new Database();
     newDb->metadata()->setName(m_db->metadata()->name());
     replaceDatabase(newDb);
+    emit lockedDatabase();
 }
 
 void DatabaseWidget::updateFilePath(const QString& filePath)

src/gui/DatabaseWidget.h

@@ -125,6 +125,7 @@ signals:
     void pressedEntry(Entry* selectedEntry);
     void pressedGroup(Group* selectedGroup);
     void unlockedDatabase();
+    void lockedDatabase();
     void listModeAboutToActivate();
     void listModeActivated();
     void searchModeAboutToActivate();
@@ -146,6 +147,7 @@ public slots:
     void copyNotes();
     void copyAttribute(QAction* action);
     void showTotp();
+    void showTotpKeyQrCode();
     void copyTotp();
     void setupTotp();
     void performAutoType();

src/gui/MainWindow.cpp

@@ -287,6 +287,7 @@ MainWindow::MainWindow()
     m_actionMultiplexer.connect(m_ui->actionEntrySetupTotp, SIGNAL(triggered()), SLOT(setupTotp()));
 
     m_actionMultiplexer.connect(m_ui->actionEntryCopyTotp, SIGNAL(triggered()), SLOT(copyTotp()));
+    m_actionMultiplexer.connect(m_ui->actionEntryTotpQRCode, SIGNAL(triggered()), SLOT(showTotpKeyQrCode()));
     m_actionMultiplexer.connect(m_ui->actionEntryCopyTitle, SIGNAL(triggered()), SLOT(copyTitle()));
     m_actionMultiplexer.connect(m_ui->actionEntryCopyUsername, SIGNAL(triggered()), SLOT(copyUsername()));
     m_actionMultiplexer.connect(m_ui->actionEntryCopyPassword, SIGNAL(triggered()), SLOT(copyPassword()));
@@ -478,6 +479,7 @@ void MainWindow::setMenuActionState(DatabaseWidget::Mode mode)
             m_ui->actionEntryTotp->setEnabled(singleEntrySelected && dbWidget->currentEntryHasTotp());
             m_ui->actionEntryCopyTotp->setEnabled(singleEntrySelected && dbWidget->currentEntryHasTotp());
             m_ui->actionEntrySetupTotp->setEnabled(singleEntrySelected);
+            m_ui->actionEntryTotpQRCode->setEnabled(singleEntrySelected && dbWidget->currentEntryHasTotp());
             m_ui->actionGroupNew->setEnabled(groupSelected);
             m_ui->actionGroupEdit->setEnabled(groupSelected);
             m_ui->actionGroupDelete->setEnabled(groupSelected && dbWidget->canDeleteCurrentGroup());

src/gui/MainWindow.ui

@@ -251,6 +251,7 @@
      </property>
      <addaction name="actionEntryCopyTotp"/>
      <addaction name="actionEntryTotp"/>
+     <addaction name="actionEntryTotpQRCode"/>
      <addaction name="actionEntrySetupTotp"/>
     </widget>
     <addaction name="actionEntryCopyUsername"/>
@@ -577,7 +578,12 @@
   </action>
   <action name="actionEntryTotp">
    <property name="text">
-    <string>Show TOTP</string>
+    <string>Show TOTP...</string>
+   </property>
+  </action>
+  <action name="actionEntryTotpQRCode">
+   <property name="text">
+    <string>Show TOTP QR Code...</string>
    </property>
   </action>
   <action name="actionEntrySetupTotp">

src/gui/SquareSvgWidget.cpp

@@ -0,0 +1,28 @@
+/*
+ *  Copyright (C) 2018 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "SquareSvgWidget.h"
+
+bool SquareSvgWidget::hasHeightForWidth() const
+{
+    return true;
+}
+
+int SquareSvgWidget::heightForWidth(int width) const
+{
+    return width;
+}

src/gui/SquareSvgWidget.h

@@ -0,0 +1,33 @@
+/*
+ *  Copyright (C) 2018 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSX_SquareSvgWidget_H
+#define KEEPASSX_SquareSvgWidget_H
+
+#include <QtSvg/QSvgWidget>
+
+class SquareSvgWidget : public QSvgWidget
+{
+public:
+    SquareSvgWidget() = default;
+    ~SquareSvgWidget() override = default;
+
+    bool hasHeightForWidth() const override;
+    int heightForWidth(int width) const override;
+};
+
+#endif // KEEPASSX_SquareSvgWidget_H

src/gui/TotpExportSettingsDialog.cpp

@@ -0,0 +1,117 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "TotpExportSettingsDialog.h"
+#include "core/Config.h"
+#include "core/Entry.h"
+#include "gui/Clipboard.h"
+#include "gui/DatabaseWidget.h"
+#include "gui/SquareSvgWidget.h"
+#include "qrcode/QrCode.h"
+#include "totp/totp.h"
+
+#include <QBuffer>
+#include <QDialogButtonBox>
+#include <QLabel>
+#include <QMessageBox>
+#include <QPushButton>
+#include <QSizePolicy>
+#include <QVBoxLayout>
+
+TotpExportSettingsDialog::TotpExportSettingsDialog(DatabaseWidget* parent, Entry* entry)
+    : QDialog(parent)
+    , m_timer(new QTimer(this))
+    , m_verticalLayout(new QVBoxLayout())
+    , m_totpSvgWidget(new SquareSvgWidget())
+    , m_countDown(new QLabel())
+    , m_warningLabel(new QLabel())
+    , m_buttonBox(new QDialogButtonBox(QDialogButtonBox::Close | QDialogButtonBox::Ok))
+{
+    m_verticalLayout->addWidget(m_warningLabel);
+    m_verticalLayout->addItem(new QSpacerItem(0, 0));
+
+    m_verticalLayout->addStretch(0);
+    m_verticalLayout->addWidget(m_totpSvgWidget);
+    m_verticalLayout->addStretch(0);
+    m_verticalLayout->addWidget(m_countDown);
+    m_verticalLayout->addWidget(m_buttonBox);
+
+    setLayout(m_verticalLayout);
+    setAttribute(Qt::WA_DeleteOnClose);
+
+    connect(m_buttonBox, SIGNAL(rejected()), SLOT(close()));
+    connect(m_buttonBox, SIGNAL(accepted()), SLOT(copyToClipboard()));
+    connect(m_timer, SIGNAL(timeout()), this, SLOT(autoClose()));
+    connect(parent, SIGNAL(lockedDatabase()), this, SLOT(close()));
+
+    m_buttonBox->button(QDialogButtonBox::Ok)->setText(tr("Copy"));
+    m_countDown->setAlignment(Qt::AlignCenter);
+
+    m_secTillClose = 45;
+    autoClose();
+    m_timer->start(1000);
+
+    const auto totpSettings = entry->totpSettings();
+    if (totpSettings->custom || !totpSettings->encoder.shortName.isEmpty()) {
+        m_warningLabel->setWordWrap(true);
+        m_warningLabel->setMargin(5);
+        m_warningLabel->setText(tr("NOTE: These TOTP settings are custom and may not work with other authenticators.",
+                                   "TOTP QR code dialog warning"));
+    } else {
+        m_warningLabel->hide();
+    }
+
+    m_totpUri = Totp::writeSettings(entry->totpSettings(), entry->title(), entry->username(), true);
+    const QrCode qrc(m_totpUri);
+
+    if (qrc.isValid()) {
+        QBuffer buffer;
+        qrc.writeSvg(&buffer, logicalDpiX());
+        m_totpSvgWidget->load(buffer.data());
+        const int minsize = static_cast<int>(logicalDpiX() * 2.5);
+        m_totpSvgWidget->setMinimumSize(minsize, minsize);
+    } else {
+        auto errorBox = new QMessageBox(parent);
+        errorBox->setAttribute(Qt::WA_DeleteOnClose);
+        errorBox->setIcon(QMessageBox::Warning);
+        errorBox->setText(tr("There was an error creating the QR code."));
+        errorBox->exec();
+        close();
+    }
+
+    show();
+}
+
+void TotpExportSettingsDialog::copyToClipboard()
+{
+    clipboard()->setText(m_totpUri);
+    if (config()->get("MinimizeOnCopy").toBool()) {
+        static_cast<DatabaseWidget*>(parent())->window()->showMinimized();
+    }
+}
+
+void TotpExportSettingsDialog::autoClose()
+{
+    if (--m_secTillClose > 0) {
+        m_countDown->setText(tr("Closing in %1 seconds.").arg(m_secTillClose));
+    } else {
+        m_timer->stop();
+        close();
+    }
+}
+
+TotpExportSettingsDialog::~TotpExportSettingsDialog() = default;

src/gui/TotpExportSettingsDialog.h

@@ -0,0 +1,57 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSX_TotpExportSettingsDialog_H
+#define KEEPASSX_TotpExportSettingsDialog_H
+
+#include "core/Database.h"
+#include "core/Entry.h"
+#include "gui/DatabaseWidget.h"
+#include <QDialog>
+#include <QTimer>
+#include <QUrl>
+
+class QVBoxLayout;
+class SquareSvgWidget;
+class QLabel;
+class QDialogButtonBox;
+
+class TotpExportSettingsDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit TotpExportSettingsDialog(DatabaseWidget* parent = nullptr, Entry* entry = nullptr);
+    ~TotpExportSettingsDialog();
+
+private slots:
+    void copyToClipboard();
+    void autoClose();
+
+private:
+    int m_secTillClose;
+    QString m_totpUri;
+    QTimer* m_timer;
+
+    QVBoxLayout* m_verticalLayout;
+    SquareSvgWidget* m_totpSvgWidget;
+    QLabel* m_countDown;
+    QLabel* m_warningLabel;
+    QDialogButtonBox* m_buttonBox;
+};
+
+#endif // KEEPASSX_TOTPEXPORTSETTINGSDIALOG_H

src/qrcode/CMakeLists.txt

@@ -0,0 +1,21 @@
+#  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 2 or (at your option)
+#  version 3 of the License.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(qrcode_SOURCES
+    QrCode.cpp
+)
+
+add_library(qrcode STATIC ${qrcode_SOURCES})
+target_link_libraries(qrcode Qt5::Core Qt5::Widgets Qt5::Svg ${QRENCODE_LIBRARY})

src/qrcode/QrCode.cpp

@@ -0,0 +1,132 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "QrCode.h"
+#include "QrCode_p.h"
+
+#include <QBrush>
+#include <QByteArray>
+#include <QIODevice>
+#include <QImage>
+#include <QPainter>
+#include <QPen>
+#include <QString>
+#include <QSvgGenerator>
+#include <QVariant>
+
+QrCodePrivate::QrCodePrivate()
+    : m_qrcode(nullptr)
+{
+}
+
+QrCodePrivate::~QrCodePrivate()
+{
+    if (m_qrcode) {
+        QRcode_free(m_qrcode);
+    }
+}
+
+QrCode::QrCode()
+    : d_ptr(new QrCodePrivate())
+{
+}
+
+QrCode::QrCode(const QString& data, const Version version, const ErrorCorrectionLevel ecl, const bool caseSensitive)
+    : d_ptr(new QrCodePrivate())
+{
+    init(data, version, ecl, caseSensitive);
+}
+
+QrCode::QrCode(const QByteArray& data, const Version version, const ErrorCorrectionLevel ecl)
+    : d_ptr(new QrCodePrivate())
+{
+    init(data, version, ecl);
+}
+
+QrCode::~QrCode() = default;
+
+void QrCode::init(const QString& data, const Version version, const ErrorCorrectionLevel ecl, bool caseSensitive)
+{
+    if (data.isEmpty()) {
+        return;
+    }
+
+    d_ptr->m_qrcode = QRcode_encodeString(data.toLocal8Bit().data(),
+                                          static_cast<int>(version),
+                                          static_cast<QRecLevel>(ecl),
+                                          QR_MODE_8,
+                                          caseSensitive ? 1 : 0);
+}
+
+void QrCode::init(const QByteArray& data, const Version version, const ErrorCorrectionLevel ecl)
+{
+    if (data.isEmpty()) {
+        return;
+    }
+
+    d_ptr->m_qrcode = QRcode_encodeData(data.size(),
+                                        reinterpret_cast<const unsigned char*>(data.data()),
+                                        static_cast<int>(version),
+                                        static_cast<QRecLevel>(ecl));
+}
+
+bool QrCode::isValid() const
+{
+    return d_ptr->m_qrcode != nullptr;
+}
+
+void QrCode::writeSvg(QIODevice* outputDevice, const int dpi, const int margin) const
+{
+    if (margin < 0 || d_ptr->m_qrcode == nullptr || outputDevice == nullptr) {
+        return;
+    }
+
+    const int width = d_ptr->m_qrcode->width + margin * 2;
+
+    QSvgGenerator generator;
+    generator.setSize(QSize(width, width));
+    generator.setViewBox(QRect(0, 0, width, width));
+    generator.setResolution(dpi);
+    generator.setOutputDevice(outputDevice);
+
+    QPainter painter;
+    painter.begin(&generator);
+
+    // Background
+    painter.setClipRect(QRect(0, 0, width, width));
+    painter.fillRect(QRect(0, 0, width, width), Qt::white);
+
+    // Foreground
+    // "Dots" are stored in a quint8 x quint8 array using row-major order.
+    // A dot is black if the LSB of its corresponding quint8 is 1.
+    const QPen pen(Qt::black, 0, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);
+    const QBrush brush(Qt::black);
+    painter.setPen(pen);
+    painter.setBrush(brush);
+
+    const int rowSize = d_ptr->m_qrcode->width;
+    unsigned char* dot = d_ptr->m_qrcode->data;
+    for (int y = 0; y < rowSize; ++y) {
+        for (int x = 0; x < rowSize; ++x) {
+            if (quint8(0x01) == (static_cast<quint8>(*dot++) & quint8(0x01))) {
+                painter.drawRect(margin + x, margin + y, 1, 1);
+            }
+        }
+    }
+
+    painter.end();
+}

src/qrcode/QrCode.h

@@ -0,0 +1,78 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSX_QRCODE_H
+#define KEEPASSX_QRCODE_H
+
+#include <QScopedPointer>
+#include <QtCore/qglobal.h>
+
+class QImage;
+class QIODevice;
+class QString;
+class QByteArray;
+
+struct QrCodePrivate;
+
+class QrCode
+{
+
+public:
+    enum class ErrorCorrectionLevel : int
+    {
+        LOW = 0,
+        MEDIUM,
+        QUARTILE,
+        HIGH
+    };
+
+    // See: http://www.qrcode.com/en/about/version.html
+    // clang-format off
+    enum class Version : int
+    {
+        AUTO = 0,
+        V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20,
+        V21, V22, V23, V24, V25, V26, V27, V28, V29, V30, V31, V32, V33, V34, V35, V36, V37, V38, V39, V40
+    };
+    // clang-format on
+
+    // Uses QRcode_encodeString (can't contain NUL characters)
+    explicit QrCode(const QString& data,
+                    const Version version = Version::AUTO,
+                    const ErrorCorrectionLevel ecl = ErrorCorrectionLevel::HIGH,
+                    const bool caseSensitive = true);
+
+    // Uses QRcode_encodeData (can contain NUL characters)
+    explicit QrCode(const QByteArray& data,
+                    const Version version = Version::AUTO,
+                    const ErrorCorrectionLevel ecl = ErrorCorrectionLevel::HIGH);
+
+    QrCode();
+    ~QrCode();
+
+    bool isValid() const;
+    void writeSvg(QIODevice* outputDevice, const int dpi, const int margin = 4) const;
+
+private:
+    void init(const QString& data, const Version version, const ErrorCorrectionLevel ecl, const bool caseSensitive);
+
+    void init(const QByteArray& data, const Version version, const ErrorCorrectionLevel ecl);
+
+    QScopedPointer<QrCodePrivate> d_ptr;
+};
+
+#endif // KEEPASSX_QRCODE_H

src/qrcode/QrCode_p.h

@@ -0,0 +1,33 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This class exists to isolate <qrencode.h> from the rest of the code base. */
+
+#ifndef KEEPASSX_QRCODEPRIVATE_H
+#define KEEPASSX_QRCODEPRIVATE_H
+
+#include <qrencode.h>
+
+struct QrCodePrivate
+{
+    QRcode* m_qrcode;
+
+    QrCodePrivate();
+    ~QrCodePrivate();
+};
+
+#endif // KEEPASSX_QRCODEPRIVATE_H

src/totp/totp.cpp

@@ -22,7 +22,8 @@
 
 #include <QCryptographicHash>
 #include <QMessageAuthenticationCode>
-#include <QRegExp>
+#include <QRegularExpression>
+#include <QRegularExpressionMatch>
 #include <QUrl>
 #include <QUrlQuery>
 #include <QVariant>
@@ -79,7 +80,7 @@ QSharedPointer<Totp::Settings> Totp::parseSettings(const QString& rawSettings, c
     settings->step = qBound(1u, settings->step, 60u);
 
     // Detect custom settings, used by setup GUI
-    if (settings->encoder.shortName != STEAM_SHORTNAME
+    if (settings->encoder.shortName.isEmpty()
         && (settings->digits != DEFAULT_DIGITS || settings->step != DEFAULT_STEP)) {
         settings->custom = true;
     }
@@ -96,15 +97,21 @@ QSharedPointer<Totp::Settings> Totp::createSettings(const QString& key, const ui
     });
 }
 
-QString Totp::writeSettings(const QSharedPointer<Totp::Settings> settings)
+QString Totp::writeSettings(const QSharedPointer<Totp::Settings> settings, const QString& title, const QString& username, bool forceOtp)
 {
     if (settings.isNull()) {
         return {};
     }
 
     // OTP Url output
-    if (settings->otpUrl) {
-        auto urlstring = QString("key=%1&step=%2&size=%3").arg(settings->key).arg(settings->step).arg(settings->digits);
+    if (settings->otpUrl || forceOtp) {
+        auto urlstring = QString("otpauth://totp/%1:%2?secret=%3&period=%4&digits=%5&issuer=%1")
+                .arg(title.isEmpty() ? "KeePassXC" : QString(QUrl::toPercentEncoding(title)))
+                .arg(username.isEmpty() ? "none" : QString(QUrl::toPercentEncoding(username)))
+                .arg(QString(Base32::sanitizeInput(settings->key.toLatin1())))
+                .arg(settings->step)
+                .arg(settings->digits);
+
         if (!settings->encoder.name.isEmpty()) {
             urlstring.append("&encoder=").append(settings->encoder.name);
         }

src/totp/totp.h

@@ -60,7 +60,8 @@ static const QString ATTRIBUTE_SETTINGS = "TOTP Settings";
 QSharedPointer<Totp::Settings> parseSettings(const QString& rawSettings, const QString& key = {});
 QSharedPointer<Totp::Settings> createSettings(const QString& key, const uint digits, const uint step,
                                               const QString& encoderShortName = {});
-QString writeSettings(const QSharedPointer<Totp::Settings> settings);
+QString writeSettings(const QSharedPointer<Totp::Settings> settings, const QString& title = {},
+                      const QString& username = {}, bool forceOtp = false);
 
 QString generateTotp(const QSharedPointer<Totp::Settings> settings, const quint64 time = 0ull);