diff --git a/src/dbus/NhekoDBusApi.cpp b/src/dbus/NhekoDBusApi.cpp
new file mode 100644
index 00000000..edc3fa8a
--- /dev/null
+++ b/src/dbus/NhekoDBusApi.cpp
@@ -0,0 +1,166 @@
+// SPDX-FileCopyrightText: 2010 David Sansome <me@davidsansome.com>
+// SPDX-FileCopyrightText: 2022 Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "NhekoDBusApi.h"
+
+#include <QDBusMetaType>
+
+namespace nheko::dbus {
+void
+init()
+{
+ qDBusRegisterMetaType<RoomInfoItem>();
+ qDBusRegisterMetaType<QVector<RoomInfoItem>>();
+ qDBusRegisterMetaType<QImage>();
+ qDBusRegisterMetaType<QVersionNumber>();
+}
+
+bool
+apiVersionIsCompatible(const QVersionNumber &clientAppVersion)
+{
+ if (clientAppVersion.majorVersion() != nheko::dbus::apiVersion.majorVersion())
+ return false;
+ if (clientAppVersion.minorVersion() > nheko::dbus::apiVersion.minorVersion())
+ return false;
+ if (clientAppVersion.minorVersion() == nheko::dbus::apiVersion.minorVersion() &&
+ clientAppVersion.microVersion() < nheko::dbus::apiVersion.microVersion())
+ return false;
+
+ return true;
+}
+
+RoomInfoItem::RoomInfoItem(const QString &roomId,
+ const QString &alias,
+ const QString &title,
+ const QImage &image,
+ const int unreadNotifications,
+ QObject *parent)
+ : QObject{parent}
+ , roomId_{roomId}
+ , alias_{alias}
+ , roomName_{title}
+ , image_{image}
+ , unreadNotifications_{unreadNotifications}
+{}
+
+RoomInfoItem::RoomInfoItem(const RoomInfoItem &other)
+ : QObject{other.parent()}
+ , roomId_{other.roomId_}
+ , alias_{other.alias_}
+ , roomName_{other.roomName_}
+ , image_{other.image_}
+ , unreadNotifications_{other.unreadNotifications_}
+{}
+
+RoomInfoItem &
+RoomInfoItem::operator=(const RoomInfoItem &other)
+{
+ roomId_ = other.roomId_;
+ alias_ = other.alias_;
+ roomName_ = other.roomName_;
+ image_ = other.image_;
+ unreadNotifications_ = other.unreadNotifications_;
+ return *this;
+}
+
+QDBusArgument &
+operator<<(QDBusArgument &arg, const RoomInfoItem &item)
+{
+ arg.beginStructure();
+ arg << item.roomId_ << item.alias_ << item.roomName_ << item.image_
+ << item.unreadNotifications_;
+ arg.endStructure();
+ return arg;
+}
+
+const QDBusArgument &
+operator>>(const QDBusArgument &arg, RoomInfoItem &item)
+{
+ arg.beginStructure();
+ arg >> item.roomId_ >> item.alias_ >> item.roomName_ >> item.image_ >>
+ item.unreadNotifications_;
+ if (item.image_.isNull())
+ item.image_ = QImage{QStringLiteral(":/icons/ui/speech-bubbles.svg")};
+
+ arg.endStructure();
+ return arg;
+}
+} // nheko::dbus
+
+/**
+ * Automatic marshaling of a QImage for org.freedesktop.Notifications.Notify
+ *
+ * This function is heavily based on a function from the Clementine project (see
+ * http://www.clementine-player.org) and licensed under the GNU General Public
+ * License, version 3 or later.
+ *
+ * SPDX-FileCopyrightText: 2010 David Sansome <me@davidsansome.com>
+ */
+QDBusArgument &
+operator<<(QDBusArgument &arg, const QImage &image)
+{
+ if (image.isNull()) {
+ arg.beginStructure();
+ arg << 0 << 0 << 0 << false << 0 << 0 << QByteArray();
+ arg.endStructure();
+ return arg;
+ }
+
+ QImage i = image.height() > 100 || image.width() > 100
+ ? image.scaledToHeight(100, Qt::SmoothTransformation)
+ : image;
+ i = std::move(i).convertToFormat(QImage::Format_RGBA8888);
+
+ arg.beginStructure();
+ arg << i.width();
+ arg << i.height();
+ arg << i.bytesPerLine();
+ arg << i.hasAlphaChannel();
+ int channels = i.isGrayscale() ? 1 : (i.hasAlphaChannel() ? 4 : 3);
+ arg << i.depth() / channels;
+ arg << channels;
+ arg << QByteArray(reinterpret_cast<const char *>(i.bits()), i.sizeInBytes());
+ arg.endStructure();
+
+ return arg;
+}
+
+// This function, however, was merely reverse-engineered from the above function
+// and is not from the Clementine project.
+const QDBusArgument &
+operator>>(const QDBusArgument &arg, QImage &image)
+{
+ // garbage is used as a sort of /dev/null
+ int width, height, garbage;
+ QByteArray bits;
+
+ arg.beginStructure();
+ arg >> width >> height >> garbage >> garbage >> garbage >> garbage >> bits;
+ arg.endStructure();
+
+ image = QImage(reinterpret_cast<uchar *>(bits.data()), width, height, QImage::Format_RGBA8888);
+
+ 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;
+}
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