Link Previews

Uses Matrix's preview API to generate embedded link previews.

Only title and description for now.

![image](/uploads/2c5d632480073fe54345cdbe22ea54dc/image.png)

src/CMakeLists.txt

@@ -39,6 +39,7 @@ add_library(neochat STATIC
     collapsestateproxymodel.cpp
     urlhelper.cpp
     windowcontroller.cpp
+    linkpreviewer.cpp
 )
 
 add_executable(neochat-app

src/linkpreviewer.cpp

@@ -0,0 +1,64 @@
+// SPDX-FileCopyrightText: 2022 Bharadwaj Raju <bharadwaj.raju777@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-or-later OR LicenseRef-KDE-Accepted-GPL
+
+#include "linkpreviewer.h"
+
+#include "controller.h"
+
+LinkPreviewer::LinkPreviewer(QObject *parent)
+    : QObject(parent)
+    , m_loaded(false)
+{
+}
+
+bool LinkPreviewer::loaded() const
+{
+    return m_loaded;
+}
+
+QString LinkPreviewer::title() const
+{
+    return m_title;
+}
+
+QString LinkPreviewer::description() const
+{
+    return m_description;
+}
+
+QString LinkPreviewer::imageSource() const
+{
+    return m_imageSource;
+}
+
+QUrl LinkPreviewer::url() const
+{
+    return m_url;
+}
+
+void LinkPreviewer::setUrl(QUrl url)
+{
+    if (url.scheme() == QStringLiteral("https")) {
+        m_loaded = false;
+        Q_EMIT loadedChanged();
+
+        m_url = url;
+        Q_EMIT urlChanged();
+
+        auto conn = Controller::instance().activeConnection();
+
+        GetUrlPreviewJob *job = conn->callApi<GetUrlPreviewJob>(m_url.toString());
+
+        connect(job, &BaseJob::success, this, [this, job]() {
+            const auto json = job->jsonData();
+            m_title = json["og:title"].toString();
+            m_description = json["og:description"].toString();
+            m_imageSource = json["og:image"].toString();
+            m_loaded = true;
+            Q_EMIT titleChanged();
+            Q_EMIT descriptionChanged();
+            Q_EMIT imageSourceChanged();
+            Q_EMIT loadedChanged();
+        });
+    }
+}

src/linkpreviewer.h

@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: 2022 Bharadwaj Raju <bharadwaj.raju777@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-or-later OR LicenseRef-KDE-Accepted-GPL
+
+#pragma once
+
+#include <connection.h>
+#include <csapi/content-repo.h>
+
+#include <QObject>
+
+using namespace Quotient;
+
+class LinkPreviewer : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(bool loaded READ loaded NOTIFY loadedChanged)
+    Q_PROPERTY(QString title READ title NOTIFY titleChanged)
+    Q_PROPERTY(QString description READ description NOTIFY descriptionChanged)
+    Q_PROPERTY(QString imageSource READ imageSource NOTIFY imageSourceChanged)
+    Q_PROPERTY(QUrl url READ url WRITE setUrl NOTIFY urlChanged)
+
+public:
+    explicit LinkPreviewer(QObject *parent = nullptr);
+
+    [[nodiscard]] bool loaded() const;
+    [[nodiscard]] QString title() const;
+    [[nodiscard]] QString description() const;
+    [[nodiscard]] QString imageSource() const;
+    [[nodiscard]] QUrl url() const;
+
+    void setUrl(QUrl);
+
+private:
+    bool m_loaded;
+    QString m_title;
+    QString m_description;
+    QString m_imageSource;
+    QUrl m_url;
+
+Q_SIGNALS:
+    void loadedChanged();
+    void titleChanged();
+    void descriptionChanged();
+    void imageSourceChanged();
+    void urlChanged();
+};

src/main.cpp

@@ -59,6 +59,7 @@
 #include "emojimodel.h"
 #include "filetypesingleton.h"
 #include "joinrulesevent.h"
+#include "linkpreviewer.h"
 #include "login.h"
 #include "matriximageprovider.h"
 #include "messageeventmodel.h"
@@ -213,6 +214,7 @@ int main(int argc, char *argv[])
     qmlRegisterType<SortFilterRoomListModel>("org.kde.neochat", 1, 0, "SortFilterRoomListModel");
     qmlRegisterType<SortFilterSpaceListModel>("org.kde.neochat", 1, 0, "SortFilterSpaceListModel");
     qmlRegisterType<DevicesModel>("org.kde.neochat", 1, 0, "DevicesModel");
+    qmlRegisterType<LinkPreviewer>("org.kde.neochat", 1, 0, "LinkPreviewer");
     qmlRegisterUncreatableType<RoomMessageEvent>("org.kde.neochat", 1, 0, "RoomMessageEvent", "ENUM");
     qmlRegisterUncreatableType<PushNotificationState>("org.kde.neochat", 1, 0, "PushNotificationState", "ENUM");
     qmlRegisterUncreatableType<NeoChatRoomType>("org.kde.neochat", 1, 0, "NeoChatRoomType", "ENUM");