previewengine.h

/*
 * Copyright (C) 2021-2024 Savoir-faire Linux Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#pragma once

#include "networkmanager.h"

#include "htmlparser.h"

class PreviewEngine final : public NetworkManager
{
    Q_OBJECT
    Q_DISABLE_COPY(PreviewEngine)
public:
    PreviewEngine(ConnectivityMonitor* cm, QObject* parent = nullptr);
    ~PreviewEngine();

Q_SIGNALS:
    void parseLink(const QString& messageId, const QString& link);
    void infoReady(const QString& messageId, const QVariantMap& info);

private:
    Q_SLOT void onParseLink(const QString& messageId, const QString& link);

    // An instance of HtmlParser used to parse HTML.
    HtmlParser* htmlParser_;

    QString getTagContent(const QList<QString>& tags, const QString& value);
    QString getTitle(const QList<QString>& metaTags);
    QString getDescription(const QList<QString>& metaTags);
    QString getImage(const QList<QString>& metaTags);

    static const QRegularExpression newlineRe;

    QThread* thread_;
};