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/**
* Copyright (C) 2021-2024 Saturneric <eric@bktus.com>
*
* This file is part of GpgFrontend.
*
* GpgFrontend 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.
*
* GpgFrontend 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 GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
*
* The initial version of the source code is inherited from
* the gpg4usb project, which is under GPL-3.0-or-later.
*
* All the source code of GpgFrontend was modified and released by
* Saturneric <eric@bktus.com> starting on May 12, 2021.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#pragma once
#include <QPlainTextEdit>
#include "EMailModel.h"
/**
* @brief A message body, shown as the text it literally is.
*
* This workspace supports plain-text mail. A body that arrived as HTML is not
* rendered and is not converted into an approximation of itself: its source is
* shown verbatim, which is the only form of it that is certainly true.
*
* That is a deliberate narrowing, and it removes rather than manages three
* separate hazards. Qt's rich-text engine is not built for real-world mail: it
* lays a nested table out again for every pass its parent makes, so cost grows
* exponentially with nesting depth and an ordinary marketing newsletter -- 45
* tables, seven deep -- never finishes, synchronously, on the GUI thread,
* inside setHtml(), with no event loop left to cancel from. Rendering also
* resolves resources, and an <img src="http://..."> turns opening a message
* into a read receipt and a confirmation that the address is live. And it lets
* a link hide its destination behind friendly words.
*
* Showing the source ends all three: no layout engine runs on attacker
* controlled markup, nothing is ever fetched, and every URL is visible as
* written. The widget is a read-only QPlainTextEdit for the same reason -- it
* has no rich-text engine to reach, so none of this can be reintroduced by
* calling the wrong setter.
*/
class EMailBodyView : public QPlainTextEdit {
Q_OBJECT
public:
explicit EMailBodyView(QWidget* parent = nullptr);
/**
* @brief Shows @p body as text.
*
* @param body the part chosen as the message body; nullptr clears the view
*/
void SetBody(const EMailPart* body);
void Clear();
/// Whether what is shown is HTML source rather than a plain-text body.
[[nodiscard]] auto ShownAsSource() const -> bool { return shown_as_source_; }
signals:
/**
* @brief An HTML body is being shown as its source.
*
* Said out loud rather than done quietly: this is not how the message was
* meant to look, and the reader is entitled to know which of the two they
* are looking at.
*/
void SignalHtmlShownAsSource();
private:
bool shown_as_source_{false};
};
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