Move NeoChatConnection and NeoChatRoom to LibNeoChat

Move `NeoChatConnection` and `NeoChatRoom` to `LibNeoChat` along with any required dependencies.

src/libneochat/linkpreviewer.h

@@ -0,0 +1,100 @@
+// 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 <QObject>
+#include <QQmlEngine>
+#include <QUrl>
+
+class NeoChatRoom;
+
+/**
+ * @class LinkPreviewer
+ *
+ * A class to download the link preview info for a URL and provide a QML interface for it.
+ *
+ * To use set the URL property and then access the other parameters which will be
+ * populated once loaded is true.
+ */
+class LinkPreviewer : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    /**
+     * @brief The URL to get the preview for.
+     */
+    Q_PROPERTY(QUrl url READ url NOTIFY urlChanged)
+
+    /**
+     * @brief Whether the preview information has been loaded.
+     */
+    Q_PROPERTY(bool loaded READ loaded NOTIFY loadedChanged)
+
+    /**
+     * @brief The title of the preview.
+     */
+    Q_PROPERTY(QString title READ title NOTIFY titleChanged)
+
+    /**
+     * @brief The description of the preview.
+     */
+    Q_PROPERTY(QString description READ description NOTIFY descriptionChanged)
+
+    /**
+     * @brief The image source for the preview.
+     */
+    Q_PROPERTY(QUrl imageSource READ imageSource NOTIFY imageSourceChanged)
+
+    /**
+     * @brief Whether there is a link to preview.
+     *
+     * A linkPreviwer is empty if the URL is empty.
+     */
+    Q_PROPERTY(bool empty READ empty NOTIFY emptyChanged)
+
+public:
+    LinkPreviewer() = default;
+    explicit LinkPreviewer(const QUrl &url, QObject *parent = nullptr);
+
+    [[nodiscard]] QUrl url() const;
+    [[nodiscard]] bool loaded() const;
+    [[nodiscard]] QString title() const;
+    [[nodiscard]] QString description() const;
+    [[nodiscard]] QUrl imageSource() const;
+    [[nodiscard]] bool empty() const;
+
+    /**
+     * @brief Whether the given string has at least 1 pre-viewable link.
+     *
+     * A link is only pre-viewable if it is http, https or something starting with www.
+     */
+    static bool hasPreviewableLinks(const QString &string);
+
+    /**
+     * @brief Return previewable links from the given string.
+     *
+     * This function is designed to give only links that should be previewed so
+     * http, https or something starting with www. The first valid link is returned.
+     */
+    static QList<QUrl> linkPreviews(QString string);
+
+private:
+    bool m_loaded;
+    QString m_title = QString();
+    QString m_description = QString();
+    QUrl m_imageSource = QUrl();
+    QUrl m_url;
+
+    void loadUrlPreview();
+
+Q_SIGNALS:
+    void loadedChanged();
+    void titleChanged();
+    void descriptionChanged();
+    void imageSourceChanged();
+    void urlChanged();
+    void emptyChanged();
+};
+Q_DECLARE_METATYPE(LinkPreviewer *)