D-Bus fixes (#1048)

According to LorenDB's First Law of Software Development, once a developer has committed or merged a new feature, he will find at least one problem with the implementation.

I realized that I was constructing the room info items with some parameters out of order, which required a rather urgent fix. Furthermore, I fixed the image decoding algorithms in the QDBusArgument operator. Finally, I switched the API version parameter back to QString, since passing it as a QVersionNumber would create a problem for non-Qt API users.

On the general improvements side of things, I added some handy wrappers for D-Bus calls so that other devs that copy the NhekoDBusApi files to use for their own applications won't have to go to the effort of making the D-Bus calls themselves.

src/dbus/NhekoDBusApi.cpp

@@ -5,7 +5,9 @@
 
 #include "NhekoDBusApi.h"
 
+#include <QDBusInterface>
 #include <QDBusMetaType>
+#include <QDBusReply>
 
 namespace nheko::dbus {
 void
@@ -14,18 +16,17 @@ init()
     qDBusRegisterMetaType<RoomInfoItem>();
     qDBusRegisterMetaType<QVector<RoomInfoItem>>();
     qDBusRegisterMetaType<QImage>();
-    qDBusRegisterMetaType<QVersionNumber>();
 }
 
 bool
 apiVersionIsCompatible(const QVersionNumber &clientAppVersion)
 {
-    if (clientAppVersion.majorVersion() != nheko::dbus::apiVersion.majorVersion())
+    if (clientAppVersion.majorVersion() != nheko::dbus::dbusApiVersion.majorVersion())
         return false;
-    if (clientAppVersion.minorVersion() > nheko::dbus::apiVersion.minorVersion())
+    if (clientAppVersion.minorVersion() > nheko::dbus::dbusApiVersion.minorVersion())
         return false;
-    if (clientAppVersion.minorVersion() == nheko::dbus::apiVersion.minorVersion() &&
-        clientAppVersion.microVersion() < nheko::dbus::apiVersion.microVersion())
+    if (clientAppVersion.minorVersion() == nheko::dbus::dbusApiVersion.minorVersion() &&
+        clientAppVersion.microVersion() < nheko::dbus::dbusApiVersion.microVersion())
         return false;
 
     return true;
@@ -87,6 +88,61 @@ operator>>(const QDBusArgument &arg, RoomInfoItem &item)
     arg.endStructure();
     return arg;
 }
+
+QString
+apiVersion()
+{
+    if (QDBusInterface interface{QStringLiteral(NHEKO_DBUS_SERVICE_NAME), QStringLiteral("/")};
+        interface.isValid())
+        return QDBusReply<QString>{interface.call(QStringLiteral("apiVersion"))}.value();
+    else
+        return {};
+}
+
+QString
+nhekoVersion()
+{
+    if (QDBusInterface interface{QStringLiteral(NHEKO_DBUS_SERVICE_NAME), QStringLiteral("/")};
+        interface.isValid())
+        return QDBusReply<QString>{interface.call(QStringLiteral("nhekoVersion"))}.value();
+    else
+        return {};
+}
+
+QVector<RoomInfoItem>
+rooms()
+{
+    if (QDBusInterface interface{QStringLiteral(NHEKO_DBUS_SERVICE_NAME), QStringLiteral("/")};
+        interface.isValid())
+        return QDBusReply<QVector<RoomInfoItem>>{interface.call(QStringLiteral("rooms"))}
+          .value();
+    else
+        return {};
+}
+
+void
+activateRoom(const QString &alias)
+{
+    if (QDBusInterface interface{QStringLiteral(NHEKO_DBUS_SERVICE_NAME), QStringLiteral("/")};
+        interface.isValid())
+        interface.call(QDBus::NoBlock, QStringLiteral("activateRoom"), alias);
+}
+
+void
+joinRoom(const QString &alias)
+{
+    if (QDBusInterface interface{QStringLiteral(NHEKO_DBUS_SERVICE_NAME), QStringLiteral("/")};
+        interface.isValid())
+        interface.call(QDBus::NoBlock, QStringLiteral("joinRoom"), alias);
+}
+
+void
+directChat(const QString &userId)
+{
+    if (QDBusInterface interface{QStringLiteral(NHEKO_DBUS_SERVICE_NAME), QStringLiteral("/")};
+        interface.isValid())
+        interface.call(QDBus::NoBlock, QStringLiteral("directChat"), userId);
+}
 } // nheko::dbus
 
 /**
@@ -140,27 +196,12 @@ operator>>(const QDBusArgument &arg, QImage &image)
     arg >> width >> height >> garbage >> garbage >> garbage >> garbage >> bits;
     arg.endStructure();
 
-    image = QImage(reinterpret_cast<uchar *>(bits.data()), width, height, QImage::Format_RGBA8888);
+    // Unfortunately, this copy-and-detach is necessary to ensure that the source buffer
+    // is copied properly. If anybody finds a better solution, please implement it.
+    auto temp =
+      QImage(reinterpret_cast<uchar *>(bits.data()), width, height, QImage::Format_RGBA8888);
+    image = temp;
+    image.detach();
 
     return arg;
 }
-
-QDBusArgument &
-operator<<(QDBusArgument &arg, const QVersionNumber &v)
-{
-    arg.beginStructure();
-    arg << v.toString();
-    arg.endStructure();
-    return arg;
-}
-
-const QDBusArgument &
-operator>>(const QDBusArgument &arg, QVersionNumber &v)
-{
-    arg.beginStructure();
-    QString temp;
-    arg >> temp;
-    v = QVersionNumber::fromString(temp);
-    arg.endStructure();
-    return arg;
-}

src/dbus/NhekoDBusApi.h

@@ -18,7 +18,7 @@ init();
 
 //! The nheko D-Bus API version provided by this file. The API version number follows semantic
 //! versioning as defined by https://semver.org.
-const QVersionNumber apiVersion{0, 0, 1};
+const QVersionNumber dbusApiVersion{0, 0, 1};
 
 //! Compare the installed Nheko API to the version that your client app targets to see if they
 //! are compatible.
@@ -58,6 +58,26 @@ private:
     int unreadNotifications_;
 };
 
+//! Get the nheko D-Bus API version.
+QString
+apiVersion();
+//! Get the nheko version.
+QString
+nhekoVersion();
+//! Call this function to get a list of all joined rooms.
+QVector<RoomInfoItem>
+rooms();
+//! Activates a currently joined room.
+void
+activateRoom(const QString &alias);
+//! Joins a room. It is your responsibility to ask for confirmation (if desired).
+void
+joinRoom(const QString &alias);
+//! Starts or activates a direct chat. It is your responsibility to ask for confirmation (if
+//! desired).
+void
+directChat(const QString &userId);
+
 QDBusArgument &
 operator<<(QDBusArgument &arg, const RoomInfoItem &item);
 const QDBusArgument &
@@ -70,11 +90,6 @@ operator<<(QDBusArgument &arg, const QImage &image);
 const QDBusArgument &
 operator>>(const QDBusArgument &arg, QImage &);
 
-QDBusArgument &
-operator<<(QDBusArgument &arg, const QVersionNumber &v);
-const QDBusArgument &
-operator>>(const QDBusArgument &arg, QVersionNumber &v);
-
 #define NHEKO_DBUS_SERVICE_NAME "im.nheko.Nheko"
 
 #endif // NHEKODBUSAPI_H

src/dbus/NhekoDBusBackend.cpp

@@ -19,7 +19,7 @@ NhekoDBusBackend::NhekoDBusBackend(RoomlistModel *parent)
 {}
 
 QVector<nheko::dbus::RoomInfoItem>
-NhekoDBusBackend::getRooms(const QDBusMessage &message)
+NhekoDBusBackend::rooms(const QDBusMessage &message)
 {
     const auto roomListModel = m_parent->models;
     QSharedPointer<QVector<nheko::dbus::RoomInfoItem>> model{
@@ -39,7 +39,7 @@ NhekoDBusBackend::getRooms(const QDBusMessage &message)
               }
 
               model->push_back(nheko::dbus::RoomInfoItem{
-                room->roomId(), room->roomName(), alias, image, room->notificationCount()});
+                room->roomId(), alias, room->roomName(), image, room->notificationCount()});
 
               if (model->length() == roomListModelSize) {
                   auto reply = message.createReply();
@@ -81,7 +81,7 @@ NhekoDBusBackend::joinRoom(const QString &alias) const
 }
 
 void
-NhekoDBusBackend::startDirectChat(const QString &userId) const
+NhekoDBusBackend::directChat(const QString &userId) const
 {
     bringWindowToTop();
     ChatPage::instance()->startChat(userId);

src/dbus/NhekoDBusBackend.h

@@ -23,18 +23,18 @@ public:
 
 public slots:
     //! Get the nheko D-Bus API version.
-    Q_SCRIPTABLE QVersionNumber apiVersion() const { return nheko::dbus::apiVersion; }
+    Q_SCRIPTABLE QString apiVersion() const { return nheko::dbus::dbusApiVersion.toString(); }
     //! Get the nheko version.
-    Q_SCRIPTABLE QString nhekoVersionString() const { return nheko::version; }
+    Q_SCRIPTABLE QString nhekoVersion() const { return nheko::version; }
     //! Call this function to get a list of all joined rooms.
-    Q_SCRIPTABLE QVector<nheko::dbus::RoomInfoItem> getRooms(const QDBusMessage &message);
+    Q_SCRIPTABLE QVector<nheko::dbus::RoomInfoItem> rooms(const QDBusMessage &message);
     //! Activates a currently joined room.
     Q_SCRIPTABLE void activateRoom(const QString &alias) const;
     //! Joins a room. It is your responsibility to ask for confirmation (if desired).
     Q_SCRIPTABLE void joinRoom(const QString &alias) const;
     //! Starts or activates a direct chat. It is your responsibility to ask for confirmation (if
     //! desired).
-    Q_SCRIPTABLE void startDirectChat(const QString &userId) const;
+    Q_SCRIPTABLE void directChat(const QString &userId) const;
 
 private:
     void bringWindowToTop() const;