Link Previews

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

Only title and description for now.

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

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();
+};