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;
+}
diff --git a/src/dbus/NhekoDBusApi.h b/src/dbus/NhekoDBusApi.h
new file mode 100644
index 00000000..47cc108a
--- /dev/null
+++ b/src/dbus/NhekoDBusApi.h
@@ -0,0 +1,80 @@
+// SPDX-FileCopyrightText: 2022 Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NHEKODBUSAPI_H
+#define NHEKODBUSAPI_H
+
+#include <QDBusArgument>
+#include <QIcon>
+#include <QObject>
+#include <QVersionNumber>
+
+namespace nheko::dbus {
+
+//! Registers all necessary classes with D-Bus. Call this before using any nheko D-Bus classes.
+void
+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};
+
+//! Compare the installed Nheko API to the version that your client app targets to see if they
+//! are compatible.
+bool
+apiVersionIsCompatible(const QVersionNumber &clientAppVersion);
+
+class RoomInfoItem : public QObject
+{
+ Q_OBJECT
+
+public:
+ RoomInfoItem(const QString &roomId = QString{},
+ const QString &alias = QString{},
+ const QString &title = QString{},
+ const QImage &image = QImage{},
+ const int unreadNotifications = 0,
+ QObject *parent = nullptr);
+
+ RoomInfoItem(const RoomInfoItem &other);
+
+ const QString &roomId() const { return roomId_; }
+ const QString &alias() const { return alias_; }
+ const QString &roomName() const { return roomName_; }
+ const QImage &image() const { return image_; }
+ int unreadNotifications() const { return unreadNotifications_; }
+
+ RoomInfoItem &operator=(const RoomInfoItem &other);
+ friend QDBusArgument &operator<<(QDBusArgument &arg, const nheko::dbus::RoomInfoItem &item);
+ friend const QDBusArgument &
+ operator>>(const QDBusArgument &arg, nheko::dbus::RoomInfoItem &item);
+
+private:
+ QString roomId_;
+ QString alias_;
+ QString roomName_;
+ QImage image_;
+ int unreadNotifications_;
+};
+
+QDBusArgument &
+operator<<(QDBusArgument &arg, const RoomInfoItem &item);
+const QDBusArgument &
+operator>>(const QDBusArgument &arg, RoomInfoItem &item);
+} // nheko::dbus
+Q_DECLARE_METATYPE(nheko::dbus::RoomInfoItem)
+
+QDBusArgument &
+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 "io.github.Nheko-Reborn.nheko"
+
+#endif // NHEKODBUSAPI_H
diff --git a/src/dbus/NhekoDBusBackend.cpp b/src/dbus/NhekoDBusBackend.cpp
new file mode 100644
index 00000000..3645aea6
--- /dev/null
+++ b/src/dbus/NhekoDBusBackend.cpp
@@ -0,0 +1,87 @@
+// SPDX-FileCopyrightText: 2022 Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "NhekoDBusBackend.h"
+
+#include "Cache_p.h"
+#include "ChatPage.h"
+#include "Logging.h"
+#include "MainWindow.h"
+#include "MxcImageProvider.h"
+#include "timeline/RoomlistModel.h"
+
+#include <QDBusConnection>
+
+NhekoDBusBackend::NhekoDBusBackend(RoomlistModel *parent)
+ : QObject{parent}
+ , m_parent{parent}
+{}
+
+QVector<nheko::dbus::RoomInfoItem>
+NhekoDBusBackend::getRooms(const QDBusMessage &message)
+{
+ const auto roomListModel = m_parent->models;
+ QSharedPointer<QVector<nheko::dbus::RoomInfoItem>> model{
+ new QVector<nheko::dbus::RoomInfoItem>};
+
+ for (const auto &room : roomListModel) {
+ MainWindow::instance()->imageProvider()->download(
+ room->roomAvatarUrl().remove("mxc://"),
+ {96, 96},
+ [message, room, model, roomListModel](
+ const QString &, const QSize &, const QImage &image, const QString &) {
+ const auto aliases = cache::client()->getRoomAliases(room->roomId().toStdString());
+ QString alias;
+ if (aliases.has_value()) {
+ const auto &val = aliases.value();
+ if (!val.alias.empty())
+ alias = QString::fromStdString(val.alias);
+ else if (val.alt_aliases.size() > 0)
+ alias = QString::fromStdString(val.alt_aliases.front());
+ }
+
+ model->push_back(nheko::dbus::RoomInfoItem{
+ room->roomId(), room->roomName(), alias, image, room->notificationCount()});
+
+ if (model->length() == roomListModel.size()) {
+ auto reply = message.createReply();
+ nhlog::ui()->debug("Sending {} rooms over D-Bus...", model->size());
+ reply << QVariant::fromValue(*model);
+ QDBusConnection::sessionBus().send(reply);
+ nhlog::ui()->debug("Rooms successfully sent to D-Bus.");
+ }
+ },
+ true);
+ }
+
+ return {};
+}
+
+void
+NhekoDBusBackend::activateRoom(const QString &alias) const
+{
+ bringWindowToTop();
+ m_parent->setCurrentRoom(alias);
+}
+
+void
+NhekoDBusBackend::joinRoom(const QString &alias) const
+{
+ bringWindowToTop();
+ ChatPage::instance()->joinRoom(alias);
+}
+
+void
+NhekoDBusBackend::startDirectChat(const QString &userId) const
+{
+ bringWindowToTop();
+ ChatPage::instance()->startChat(userId);
+}
+
+void
+NhekoDBusBackend::bringWindowToTop() const
+{
+ MainWindow::instance()->show();
+ MainWindow::instance()->raise();
+}
diff --git a/src/dbus/NhekoDBusBackend.h b/src/dbus/NhekoDBusBackend.h
new file mode 100644
index 00000000..02fd87d5
--- /dev/null
+++ b/src/dbus/NhekoDBusBackend.h
@@ -0,0 +1,45 @@
+// SPDX-FileCopyrightText: 2022 Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NHEKODBUSBACKEND_H
+#define NHEKODBUSBACKEND_H
+
+#include <QDBusMessage>
+#include <QObject>
+
+#include "NhekoDBusApi.h"
+#include "config/nheko.h"
+
+class RoomlistModel;
+
+class NhekoDBusBackend : public QObject
+{
+ Q_OBJECT
+ Q_CLASSINFO("D-Bus Interface", "im.nheko.Nheko")
+
+public:
+ NhekoDBusBackend(RoomlistModel *parent);
+
+public slots:
+ //! Get the nheko D-Bus API version.
+ Q_SCRIPTABLE QVersionNumber apiVersion() const { return nheko::dbus::apiVersion; }
+ //! Get the nheko version.
+ Q_SCRIPTABLE QString nhekoVersionString() 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);
+ //! 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;
+
+private:
+ void bringWindowToTop() const;
+
+ RoomlistModel *m_parent;
+};
+
+#endif // NHEKODBUSBACKEND_H
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